{"id":1446,"date":"2011-03-12T22:52:51","date_gmt":"2011-03-12T20:52:51","guid":{"rendered":"http:\/\/nuclearpoweryesplease.org\/blog\/?p=1446"},"modified":"2013-03-01T00:45:08","modified_gmt":"2013-02-28T22:45:08","slug":"laget-verkar-ha-stabiliserats-for-stunden","status":"publish","type":"post","link":"https:\/\/nuclearpoweryesplease.org\/blog\/2011\/03\/12\/laget-verkar-ha-stabiliserats-for-stunden\/","title":{"rendered":"L\u00e4get verkar ha stabiliserats f\u00f6r stunden"},"content":{"rendered":"

Uppdatering 21:48<\/strong><\/p>\n

Det finns inte s\u00e5 mycket att s\u00e4ga just nu. TEPCO har inte gett n\u00e5gra nya uppdateringar. JAEA’s hemsida \u00e4r nere, ingen tidning skriver n\u00e5tt nytt om reaktorerna. Man kan bara f\u00f6rmoda att alla n\u00f6d\u00e5tg\u00e4rder fungerar som dom ska. TEPCO m\u00e5ste rapportera in alla avvikelser till myndigheterna, s\u00e5 om myndigheterna inte g\u00e5r ut med nyheter kan man inte g\u00f6ra annat \u00e4n att anta att det fungerar.<\/p>\n

Fukushima Daiichi reaktorerna borde nog vara helt fyllda med havsvatten vid det h\u00e4r laget, iallafall 1an. Det verkar som att explosionsrisken \u00e4r \u00f6ver p\u00e5 Fukushima Daiichi 3. En eventuell v\u00e4teansamling i \u00f6verstrukturen borde vid det h\u00e4r laget ha diffunderat ut ur byggnaden. Det \u00e4r \u00f6ver 8 timmar sen man varnade f\u00f6r risken f\u00f6r explosion. Daini reaktorerna \u00e4r p\u00e5 v\u00e4g mot cold shutdown enligt senaste TEPCO uppdateringen f\u00f6r 9 timmar sen. Intet nytt p\u00e5 Oganawafronten och inget mer om Tokaireaktorn som f\u00f6rlorade en av sina tv\u00e5 kylpumpar.<\/p>\n

Kort och gott, det verkar rulla p\u00e5 n\u00e5gorlunda bra. V\u00e4rsta faran verkar vara \u00f6ver.<\/p>\n

Uppdatering 19:53<\/strong><\/p>\n

Nya TEPCO uppdateringar.
\nhttp:\/\/www.tepco.co.jp\/en\/press\/corp-com\/release\/11031312-e.html
\n<\/a>http:\/\/www.tepco.co.jp\/en\/press\/corp-com\/release\/11031311-e.html<\/a><\/p>\n

“Cold shutdown” inneb\u00e4r att reaktorerna \u00e4r avslagna, att trycket \u00e4r s\u00e4nkt till normalt atmosf\u00e4rstryck och vattentemperaturen i reaktorn \u00e4r under 100 grader(dvs vattnet kokar inte). Man har n\u00e5tt det l\u00e4get i en av de 4 Daini reaktorerna och \u00e4r tydligen p\u00e5 god v\u00e4g i de andra 3. Det tyder p\u00e5 att man \u00e4r p\u00e5 v\u00e4g att l\u00f6sa problemen med kylpumpar odyl. Extern el har inte varit n\u00e5got proble i Daini, problemet d\u00e4r har varit att kylningen inte fungerat optimalt efter jordb\u00e4vningen.<\/p>\n

Dom skriver inget nytt om Daiichi som vi inte redan visste. Tidsst\u00e4mplarna p\u00e5 uppdateringarna antyder att de \u00e4r 7-8 timmar\u00a0gamla, trots att de just lades upp online. \u00a0Den fortsatta tystnaden fr\u00e5n myndigheter och media runt situationen antyder att inget nytt av intresse h\u00e4nder. L\u00e4get forts\u00e4tter vara relativt stabilt.<\/p>\n


\n<\/a><\/p>\n

Fukushima Daiichi<\/strong><\/pre>\n
Unit 1(Shut down)<\/strong>\r\n- Reactor has been shut down. However, the unit is under inspection due\r\n  to the explosive sound and white smoke that was confirmed after the big\r\n  quake occurred at 3:36PM.\r\n- We have been injecting sea water and boric acid which absorbs neutron\r\n  into the reactor pressure vessel. \r\n\r\nUnit 2(Shut down)<\/strong>\r\n- Reactor has been shut down and Reactor Core Isolation Cooling System\r\n  has been injecting water to the reactor. Current reactor water level is\r\n  lower than normal level, but the water level is steady. After fully\r\n  securing safety, measures to lowering the pressure of reactor\r\n  containment vessel has been taken, under the instruction of\r\n  the national government. \r\n\r\nUnit 3(Shut down)<\/strong>\r\n- Reactor has been shut down. However, as High Pressure Core Injection\r\n  System has been automatically shut down and water injection to\r\n  the reactor was interrupted, following the instruction by\r\n  the government and with fully securing safety, steps to lowering\r\n  the pressure of reactor containment vessel has been taken. Spraying\r\n  in order to lower pressure level within the reactor containment vessel\r\n  has been cancelled.\r\n- After that, safety relief valve has been opened manually, lowering\r\n  the pressure level of the reactor, which was immediately followed\r\n  by injection of boric acid water which absorbs neutron, into\r\n  the reactor pressure vessel.<\/pre>\n
Fukushima Daini<\/strong><\/pre>\n
Unit 1 (shut down at 2:48pm on March 11th)<\/strong>\r\n- Reactor is shut down and reactor water level is stable.\r\n- Offsite power is available.\r\n- At 8:19am, Mar 12th, there was an alarm indicating that one of\r\n  the control rods was not properly inserted, however, at 10:43am,\r\n  Mar 12th the alarm was spontaneously called off. Other control rods has\r\n  been confirmed that they are fully inserted (reactor is in subcritical\r\n  status)\r\n- Status of main steam isolation valve: closed\r\n- Injection of water into the reactor is done by Make-up Water Condensate\r\n  System.\r\n- We do not believe there is leakage of reactor coolant in\r\n  the containment vessel at this moment.\r\n- At 5:22am, Mar 12th, the temperature of the suppression chamber\r\n  exceeded 100 degrees. As the reactor pressure suppression function was\r\n  lost, at 5:22am, Mar 12th, it was determined that a specific incident\r\n  stipulated in article 15, clause 1 has occurred.\r\n- We decided to prepare implementing measures to reduce the pressure of\r\n  the reactor containment vessel (partial discharge of air containing\r\n  radioactive materials) in order to fully secure safety.\r\n  This preparation work started at around 9:43am, Mar 12th and finished\r\n  at 6:30pm, Mar 12th.\r\n- Restoration work in reactor cooling function is in progress to achieve\r\n  reactor cold shutdown.\r\n\r\nUnit 2 (shut down at 2:48pm on March 11th)<\/strong>\r\n- Reactor is shut down and reactor water level is stable.\r\n- Offsite power is available.\r\n- Control rods are fully inserted (reactor is in subcritical status)\r\n- Status of main steam isolation valve: closed\r\n- Injection of water into the reactor is done by Make-up Water Condensate\r\n  System.\r\n- We do not believe there is leakage of reactor coolant in\r\n  the containment vessel.\r\n- At 5:32am, Mar 12th, the temperature of the suppression chamber\r\n  exceeded 100 degrees. As the reactor pressure suppression function was\r\n  lost, at 5:32am, Mar 12th, it was determined that a specific incident\r\n  stipulated in article 15, clause 1 has occurred.\r\n- We decided to prepare implementing measures to reduce the pressure of\r\n  the reactor containment vessel (partial discharge of air containing\r\n  radioactive materials) in order to fully secure safety.\r\n  This preparation work started at around 10:33am, Mar 12th and finished\r\n  at 10:58pm, Mar 12th.\r\n- Restoration work in reactor cooling function is in progress to achieve\r\n  reactor cold shutdown.\r\n\r\nUnit 3 (shut down at 2:48pm on March 11th)<\/strong>\r\n- Reactor is shut down and reactor water level is stable.\r\n- Offsite power is available.\r\n- Control rods are fully inserted (reactor is in subcritical status)\r\n- Status of main steam isolation valve: closed\r\n- We do not believe there is leakage of reactor coolant in\r\n  the containment vessel.\r\n- We decided to prepare implementing measures to reduce the pressure of\r\n  the reactor containment vessel (partial discharge of air containing\r\n  radioactive materials) in order to fully secure safety. The preparation\r\n  woke started at around 12:08pm, Mar 12th and finished at 12:13pm,\r\n  Mar 12th.\r\n- Reactor cold shutdown at 12:15pm, Mar 12th\r\n\r\nUnit 4 (shut down at 2:48pm on March 11th)<\/strong>\r\n- Reactor is shut down and reactor water level is stable.\r\n- Offsite power is available.\r\n- At 0:43PM, there was a signal indicating that one of the control rods\r\n  may have not properly inserted. However, we confirmed that it was\r\n  inserted completely by another signal. We will inspect the reason\r\n  of this.\r\n- Status of main steam isolation valve: closed\r\n- Injection of water into the reactor is done by Make-up Water Condensate\r\n  System.\r\n- We do not believe there is leakage of reactor coolant in\r\n  the containment vessel.\r\n- In order to cool down the reactor, injection of water into the reactor\r\n  had been done by the Reactor Core Isolation Cooling System, however,\r\n  At 6:07am, Mar 12th, the temperature of the suppression chamber\r\n  exceeded 100 degrees. As the reactor pressure suppression function was\r\n  lost, at 6:07am, Mar 12th, it was determined that a specific incident\r\n  stipulated in article 15, clause 1 has occurred.\r\n- We decided to prepare implementing measures to reduce the pressure of\r\n  the reactor containment vessel (partial discharge of air containing\r\n  radioactive materials) in order to fully secure safety. The preparation\r\n  woke started at around 11:44am, Mar 12th and finished\r\n  at around 11:52am, Mar 12th.\r\n- Restoration work in reactor cooling function is in progress to achieve\r\n  reactor cold shutdown.<\/pre>\n
Uppdatering 19:20<\/strong><\/p>\n
Inte mycket nytt just nu, F\u00f6r ett tag sen var det en liten rapportering om att en kylpump(av tv\u00e5) lagt av i en reaktor i Tokai, orelaterad till Fukushima Daiichi eller Fukushima Daini. Den andra pumpen fungerar och \u00e4r nog att p\u00e5 egen hand kyla h\u00e4rden.<\/p>\n
Det ska inte vara n\u00e5got problem med kylningen i Oganawa d\u00e4r man utl\u00f6ste n\u00f6dl\u00e4ge f\u00f6r n\u00e5gra timmar sen pga f\u00f6rh\u00f6jda niv\u00e5er av str\u00e5lning. S\u00e5 vitt vi vet s\u00e5 forts\u00e4tter inpumpningen av havsvatten i reaktor 1, 2 och 3 i Fukushima Daiichi. TEPCO har inte sl\u00e4ppt n\u00e5got uppdatering p\u00e5 flera timmar och det \u00e4r inga nya nyheter om f\u00f6rh\u00f6jda str\u00e5ldoser. L\u00e4get verkar d\u00e4rmed relativt stabilt.<\/p>\n
Uppdatering 16:28<\/strong><\/p>\n
Sammanfattning fr\u00e5n NucNet<\/p>\n
THE NUCLEAR COMMUNICATIONS NETWORK<\/strong>
\nJapan Update \/ Brief No. 58 \/ 13th March 2011\u00a0 1548 GMT<\/strong><\/p>\n
Cooling System Fails At Fukushima-Daiichi-3, Venting \u2018A Success\u2019<\/p>\n
13 Mar (NucNet): Tokyo Electric Power Company (Tepco) says it successfully vented the inner or primary containment vessel (PCV) at Fukushima-Daiichi unit 3 this morning after the high pressure reactor core coolant injection system stopped working.<\/p>\n
Tepco said the venting was completed at 08:41 local Japan time. Venting is a controlled release of gases including radioactive substances via a filter system to the outside air in order to stop pressure building up.<\/p>\n
Tepco said it then began injecting water containing boric acid, which absorbs neutrons, into the reactor system using a fire pump.<\/p>\n
A statement said workers at the plant in northern Japan had attempted to restart the unit\u2019s cooling system, but had failed.<\/p>\n
Unit 3 at the plant, a boiling water reactor of 760 megawatts, uses mixed-oxide (MOX) fuel and according to the Japan Safety Agency coolant levels were 2 to 3 meters below the top of the MOX fuel rods.<\/p>\n
Tepco said it has been seeing a rise in pressure at unit 3 and there is a risk of damage to the facility, but it is working to prevent this.<\/p>\n
Chief cabinet secretary Yukio Edano said the core of the unit-3 reactor may have been deformed due to overheating, but denied it had led to a \u201cmeltdown\u201d, a critical situation where fuel rods have melted.<\/p>\n
Mr Edano said at a news conference that a hydrogen explosion might occur at the unit 3 reactor building because hydrogen may have accumulated during a period when cooling of the reactor was insufficient.<\/p>\n
He said there might be a similar explosion to the one which occurred at unit 1 yesterday, but said even if an explosion occurs, the impact should not affect the pressure vessel and containment vessel.<\/p>\n
Unit 1 at the six-unit plant has been shut down and is being inspected following yesterday\u2019s explosion. Japanese authorities confirmed last night that the explosion occurred outside the PCV, not inside. Tepco said the integrity of the PCV remains intact.<\/p>\n
Tepco said it has been injecting seawater mixed with boric acid into the reactor in an effort to cool the nuclear fuel. This measure was approved by Japan\u2019s Nuclear and Industrial Safety Agency (NISA) and the injection procedure began at 20:20 Japan time.<\/p>\n
Unit 2 is shut down but the backup cooling system is not working, Tepco said. Workers are trying to install equipment in order to enable cooling with seawater.<\/p>\n
Tepco also confirmed last night that containment remains intact at Fukushima-Daiichi units 2 and 3. Units 4, 5 and 6 were already shut down for scheduled maintenance when the earthquake struck.<\/p>\n
Unit 2 is shut down and the reactor core isolation cooling system has been injecting water to the reactor. Tepco said the reactor water level is lower than the normal level, but the water level was \u201csteady\u201d.<\/p>\n
Radioactivity at the boundary of Fukushima-Daiichi has exceeded statutory limits and the incident has been rated as level 4 on the IAEA\u2019s International Nuclear and Radiological Event Scale (INES).<\/p>\n
Japan has also confirmed the safety of all its nuclear research reactors.<\/p>\n
Uppdatering 15:48<\/strong><\/p>\n
http:\/\/www.reuters.com\/article\/2011\/03\/13\/us-japan-quake-nuclear-expert-idUSTRE72C1MI20110313<\/p>\n
Partial nuclear meltdown \u201cno disaster,\u201d: expert <\/a>2011 03 13 1406 GMT<\/p>\n
VIENNA (Reuters) \u2013 Any partial meltdown of nuclear fuel in a quake-hit power plant in Japan \u201cis not a disaster\u201d and a complete meltdown is unlikely, a German industry expert said on Sunday.<\/p>\n
Robert Engel, a structural analyst and senior engineer at Switzerland\u2019s Leibstadt nuclear power plant, said he believed Japanese authorities would be able to manage the situation at the damaged Fukushima facility north of Tokyo.<\/p>\n
Engel was an external member of a team sent by the International Atomic Energy Agency (IAEA) to Japan after a 2007 earthquake that hit the Kashiwazaki-Kariwa plant, until then the largest to affect a nuclear complex.<\/p>\n
\u201cI think nobody can say at this time whether there is a small melting of any fuel elements or something like that. You have to inspect it afterwards,\u201d he told Reuters by phone.<\/p>\n
But a partial meltdown \u201cis not a disaster\u201d and a complete meltdown is not likely, he said, suggesting he believed Japanese authorities were succeeding in cooling down the reactors even though the systems for doing this failed after the quake hit.<\/p>\n
\u201cI only see they are trying to cool the reactor, that is the main task, and they are trying to get cooling water from the sea,\u201d Engel said, stressing he did not have first-hand information about events at the Fukushima facility.<\/p>\n
Normally, he said, the water level inside a reactor core is about 3 to 4 meters above the fuel. If the rods are not covered by water for a longer time then a core melting is possible.<\/p>\n
\u201cI think they will be able to manage it \u2026 When the (reactor) containment is intact only a small amount of radioactivity can go out, like in Three Mile Island,\u201d he said referring to the 1979 nuclear accident in the United States.<\/p>\n
At Three Mile Island, a cooling fault led to a build-up of pressure in the radioactive core and resulted in a relatively small radiation leak.<\/p>\n
Japan was working on Sunday to prevent the fuel rods in the plant from overheating after radiation leaked into the air.<\/p>\n
The government said a building housing a second reactor was at risk of exploding after a blast on Saturday blew the roof off the facility\u2019s No. 1 reactor, where there is believed to have been a partial meltdown of the fuel rods.<\/p>\n
Experts say the critical issue is what has happened or is happening with the fuel \u2014 which contains nearly all the radioactivity in the plant \u2014 and whether and to what extent it is damaged.<\/p>\n
If there is a fuel meltdown, it would release radioactivity, but Engel said there were barriers before it could escape into the atmosphere \u2014 the fuel rods, reactor vessel and containment.<\/p>\n
Uppdatering 15:38<\/strong><\/p>\n
Man har uppm\u00e4tt f\u00f6rh\u00f6jda str\u00e5lningsniv\u00e5er vid Oganawa k\u00e4rnkraftverket, det \u00e4r det kraftverk d\u00e4r man hade en brand direkt efter jordskalvet. Som resultat har man utlyst den l\u00e4gsta formen av n\u00f6dl\u00e4ge. Ingen mer information finns\u00a0tillg\u00e4ngligt\u00a0just nu och TEPCO’s hemsida har varit stend\u00f6d i 4 timmar.<\/p>\n
Reuters<\/a>
\nAccording to our correspondent, Japanese authorities told the U.N. nuclear watchdog that the lowest state of emergency was reported by the operator at the Onagawa nuclear power plant.
\n“The alert was declared as a consequence of radioactivity readings exceeding allowed levels in the area surrounding the plant. Japanese authorities are investigating the source of radiation,” the International Atomic Energy Agency (IAEA) said in a statement.<\/p>\n
Uppdatering 12:50<\/strong><\/p>\n
Nu pumpar man in havsvatten \u00e4ven i reaktor nummer 3. Tydligen st\u00f6tte man p\u00e5 problem under b\u00f6rjan p\u00e5 inpumpningen vilket ledde till att vattenniv\u00e5erna tempor\u00e4rt f\u00f6ll. Det kan ha orsakat v\u00e4tgasbildning \u00e4ven vid reaktor 3 s\u00e5 man varnar f\u00f6r att det \u00e4r m\u00f6jligt med en liknande explosion som man s\u00e5g vid 1an ig\u00e5r. En s\u00e5dan explosion borde inte skada inneslutningen p\u00e5 3an. Nu verkar inpumpningen av vatten ske utan problem. \u00a0Som man kan se p\u00e5 denna bilden s\u00e5 var det “bara” den \u00f6versta delen av byggnaden som f\u00f6rst\u00f6rdes av explosionen i reaktor 1. Den del d\u00e4r v\u00e4ggarna och taken i princip bara \u00e4r pl\u00e5t. Allt av betong st\u00e5r \u00e4nnu kvar.<\/p>\n
\"\"<\/a><\/p>\n
S\u00e5 h\u00e4r ser reaktorn ut i genomsk\u00e4rning.<\/p>\n
\"\"<\/a><\/p>\n
Det \u00e4r betongstrukturen direkt runt reaktorn som \u00e4r det viktiga. Det \u00e4r den som \u00e4r byggd f\u00f6r att klara av h\u00f6ga tryck och f\u00f6r att h\u00e5lla inne allt radioaktivt material ifall sj\u00e4lva st\u00e5lk\u00e4rlet som reaktorn utg\u00f6rs av blir skadad.<\/p>\n
http:\/\/english.kyodonews.jp\/news\/2011\/03\/77392.html<\/a>
\nUppdatering 08:39<\/strong><\/p>\n
Regeringen flaggar f\u00f6r risken att det kan ske en liknande explosion vid reaktor 3 som den vi s\u00e5g ig\u00e5r vid reaktor 1. Det handlar \u00e5terigen om att v\u00e4tgas har bildats i h\u00e4rden, ventilerats ut i reaktorbyggnaden d\u00e4r det finns risk att det ant\u00e4nds. V\u00e4tgasen bildas d\u00e5 br\u00e4nslekapslingen blir hetare \u00e4n 1000 grader<\/a>. D\u00e5 oxiderar den och bildar v\u00e4tgas och zirkoniumoxid. Eftersom 3 meter av h\u00e4rden i reaktor 3 vid Fukushima 1 har varit ovanf\u00f6r vattenniv\u00e5n s\u00e5 \u00e4r det troligt att de temperaturerna uppn\u00e5tts. Myndigheterna tror att en partiell h\u00e4rdsm\u00e4lta sker i 1an och 3an. Man h\u00e5ller p\u00e5 att fylla inneslutningarna vid reaktor 1 med havsvatten och det verkar som man planerar att g\u00f6ra samma vid reaktor 3.<\/p>\n
H\u00f6gsta str\u00e5lningsniv\u00e5erna som uppm\u00e4tts \u00e4r ungef\u00e4r 1,5 mSv per timme. Dosgr\u00e4nsen f\u00f6r en k\u00e4rnkraftsarbetare i Sverige g\u00e5r vid 20 mSv per \u00e5r. Den naturliga bakgrundsstr\u00e5lningen ger ungef\u00e4r 3-5 mSv per \u00e5r. Niv\u00e5erna har allts\u00e5 som max legat p\u00e5 ungef\u00e4r 500ggr naturlig bakgrundsstr\u00e5lning, h\u00f6gt men inte omedelbart farligt. Det som ger upphov till doserna \u00e4r f\u00f6rmodligen de flyktiga fissionsprodukterna som \u00e4r sv\u00e5ra att filtrera bort och som frig\u00f6rs l\u00e4tt ur br\u00e4nslet. Plutonium, americium och andra l\u00e5nglivade radionuklider stannar i br\u00e4nslet i princip oavsett vad som sker.<\/p>\n
Resteffekten i reaktor 3 \u00e4r nog runt 10 MW och i reaktor 1 runt 6 MW. F\u00f6r att ge en k\u00e4nsla f\u00f6r den vattenm\u00e4ngd som m\u00e5ste tillf\u00f6ras s\u00e5 blir det 4 liter vatten per sekund till 3an och 2 liter till 1an. Den vattenkran jag har i k\u00f6ket ger ungef\u00e4r 0.2 liter per sekund. S\u00e5 25 g\u00e5nger vattenfl\u00f6det fr\u00e5n en vanlig vattenkran.<\/p>\n
Nedan \u00e4r Kyodo’s senaste sammanfattande artikel av l\u00e4get.<\/p>\n
http:\/\/english.kyodonews.jp\/news\/2011\/03\/77319.html<\/a><\/p>\n
Japanese authorities scrambled Sunday to control overheating reactors at the troubled Fukushima No. 1 nuclear power plant, injecting sea water into them and reducing the pressure inside, top government spokesman Yukio Edano said.<\/p>\n
While acknowledging that the core of the No. 3 reactor at the plant may have been deformed due to overheating, the chief Cabinet secretary denied it has led to a ”meltdown,” a critical situation where fuel rods have melted.<\/p>\n
Edano warned, however, that a hydrogen explosion similar to one that occurred at the No. 1 reactor at the same facility nearby on Saturday could occur at the No. 3 reactor because large amounts of hydrogen were created when the water injection procedure briefly ran into trouble.<\/p>\n
The plant’s operator, Tokyo Electric Power Co., began injecting fresh water into the reactor to deal with the problem that the tops of MOX fuel rods were 3 meters above the water in the reactor following a magnitude 9.0 earthquake which hit northeastern and eastern Japan on Friday.<\/p>\n
But it began injecting sea water after trouble developed with a fresh water pump, a step that will lead to the reactor’s dismantlement.<\/p>\n
Radiation around the reactor measured 1,557 micro sievert at 1:52 p.m., Edano said, adding the figure went down to 184 about 50 minutes later. He dismissed concerns that the radiation level would affect human health.<\/p>\n
Meanwhile, radiation monitored at the Onagawa nuclear power plant in Miyagi Prefecture on the Pacific coast shot up on Sunday, Tohoku Electric Power Co. said, adding that it was likely caused by radioactive substances let out at the troubled Fukushima No. 1 nuclear power plant in Fukushima Prefecture.<\/p>\n
Radiation levels were very low but about 400 times as high as in normal times, the power supplier said, dismissing the possibility that the Miyagi plant was to blame.<\/p>\n
The Nuclear and Industrial Safety Agency said Tokyo Electric Power acknowledged that the No. 3 reactor of the Fukushima plant had lost its cooling functions, while 19 people at a nearby hospital were found to have been exposed to radioactivity, in addition to three cases of exposure recorded Saturday.<\/p>\n
It was the sixth reactor overall at the Fukushima No. 1 plant and the Fukushima No. 2 plant, which is located just south of the No. 1 plant, to undergo cooling failure since the massive earthquake and ensuing tsunami struck Japan on Friday.<\/p>\n
The disaster raised fears of radioactive leaks from the plants after cooling systems there were hampered, most seriously at the No. 1 reactor.<\/p>\n
An explosion Saturday at the No. 1 plant blew away the roof and the walls of the building housing the No. 1 reactor’s container.<\/p>\n
The government and nuclear authorities said there was no damage to the steel container housing the troubled No. 1 reactor, noting that the blast occurred as vapor from the container turned into hydrogen and mixed with outside oxygen.<\/p>\n
Tokyo Electric Power has begun new cooling operations to fill the reactor with sea water and pour in boric acid to prevent an occurrence of criticality. Edano said in a news conference Sunday morning that there had been no major changes in the results of radioactivity monitoring near the No. 1 reactor.<\/p>\n
No significant changes in radiation levels have been monitored.<\/p>\n
Following the explosion, the authorities expanded from 10 kilometers to 20 km the radius of the evacuation area for residents living in the vicinity of the Fukushima plants.<\/p>\n
The Fukushima prefectural government said Saturday that three people had their clothes contaminated with radioactive substances while fleeing from the No. 1 nuclear plant.<\/p>\n
The Fire and Disaster Management Agency said Sunday that 15 people were found to have been contaminated at a hospital located within 10 km of the No. 1 reactor. Edano said there was a possibility that nine people who fled on a bus had been exposed to radioactivity.<\/p>\n
==Kyodo<\/p>\n
CNN<\/strong> ~\u00a0Fukushima Daiichi Units #1 & 3 may have damage to reactor cores<\/a>
\n2011 03 12 |\u00a0 2058 EST<\/p>\n
Shirakawa, Japan (CNN) \u2014 Japanese authorities are operating on the presumption that possible meltdowns are under way at two nuclear reactors, a government official said Sunday, adding that there have been no indications yet of hazardous emissions of radioactive material into the atmosphere.<\/p>\n
The attempts to avert a possible nuclear crisis, centered around the Fukushima Daiichi facility in northeast Japan, came as rescuers frantically scrambled to find survivors following the country\u2019s strongest-ever earthquake and a devastating tsunami that, minutes later, brought crushing walls of water that wiped out nearly everything in their paths.<\/p>\n
Chief Cabinet Secretary Yukio Edano told reporters there is a \u201cpossibility\u201d of a meltdown at the plant\u2019s No. 1 reactor, adding, \u201cIt is inside the reactor. We can\u2019t see.\u201d He then added that authorities are also \u201cassuming the possibility of a meltdown\u201d at the facility\u2019s No. 3 reactor.<\/p>\n
Uppdatering 08:28<\/strong><\/p>\n
 <\/strong><\/p>\n
http:\/\/english.kyodonews.jp\/news\/2011\/03\/77319.html<\/a><\/strong><\/p>\n
Another explosion could occur outside the No. 3 reactor of the Fukushima No. 1 nuclear power plant but it is unlikely to pose new serious radiation problems, Japan’s top government spokesman said Sunday.<\/p>\n
The chief Cabinet secretary told a press conference that part of the reactor could be deformed in the event of an explosion but the reactor can resist a blast and no situation that could be termed a meltdown is expected.<\/p>\n

\nUppdatering 08:23<\/strong><\/p>\n
TEPCO’s senaste uppdatering.<\/p>\n
http:\/\/www.tepco.co.jp\/en\/press\/corp-com\/release\/11031305-e.html
\n<\/a><\/p>\n
All 6 units of Fukushima Daiichi Nuclear Power Station have been shut down.<\/strong>\r\n\r\nUnit 1(Shut down)<\/strong>\r\n- Reactor has been shut down. However, the unit is under inspection due to\r\n  the explosive sound and white smoke that was confirmed after the big\r\n  quake occurred at 3:36PM.\r\n- We have been injecting sea water and boric acid which absorbs neutron\r\n  into the reactor core. \r\n\r\nUnit 2(Shut down)<\/strong>\r\n- Reactor has been shut down and Reactor Core Isolation Cooling System has\r\n  been injecting water to the reactor. Current reactor water level is lower\r\n  than normal level, but the water level is steady. After fully securing\r\n  safety, we are preparing to implement a measure to reduce the pressure of\r\n  the reactor containment vessels under the instruction of the national\r\n  government. \r\n\r\nUnit 3(Shut down)<\/strong>\r\n- Reactor has been shut down. However, High Pressure Core Injection System\r\n  has been automatically shut down and water injection to the reactor is\r\n  currently interrupted. We are examining alternative way to inject water.\r\n  Also, following the instruction by the government and with fully securing<\/span>\r\n  safety, steps to lowering the pressure of reactor containment vessel has<\/span>\r\n  been taken. Spraying in order to lower pressure level within the reactor<\/span>\r\n  containment vessel has been cancelled.<\/span>\r\n- Currently, we do not believe there is any reactor coolant leakage inside\r\n  the reactor containment vessel.<\/pre>\n
Uppdatering 22:51<\/strong><\/p>\n
Och en till<\/p>\n
 <\/a><\/p>\n
<\/a><\/p>\n
Unit 1(Shut down)\r\n- Reactor has been shut down. However, the unit is under inspection due to\r\n  the explosive sound and white smoke that was confirmed after the big\r\n  quake occurred at 3:36PM.\r\n- We have been injecting sea water and boric acid which absorbs neutron\r\n  into the reactor core. \r\n\r\nUnit 2(Shut down)\r\n- Reactor and Reactor Core Isolation Cooling System have been shut down.\r\n  Current reactor water level is lower than normal level, but the water\r\n  level is steady. After fully securing safety, we are preparing to\r\n  implement a measure to reduce the pressure of the reactor containment\r\n  vessels under the instruction of the national government. \r\n\r\nUnit 3(Shut down)\r\n- Reactor has been shut down and we continue injecting water by High\r\n  Pressure Core Injection System. After fully securing safety, we are\r\n  preparing to implement a measure to reduce the pressure of the reactor\r\n  containment vessels under the instruction of the national government.\r\n- Currently, we do not believe there is any reactor coolant leakage\r\n  inside the reactor containment vessel.<\/pre>\n
Casualty\r\n- 2 workers of cooperative firm were injured at the occurrence of the\r\n  earthquake, and were transported to the hospital.\r\n- 1 TEPCO employee who was not able to stand by his own with his hand\r\n  holding left chest was transported to the hospital by an ambulance.\r\n- 1 subcontract worker at important earthquake-proof building was\r\n  unconscious and transported to the hospital by an ambulance.\r\n- The radiation exposure of 1 TEPCO employee, who was working inside the\r\n  reactor building, exceeded 100mSv and was transported to the hospital.\r\n- 4 workers were injured and transported to the hospital after explosive\r\n  sound and white smoke were confirmed around the Unit 1.\r\n- Presence of 2 TEPCO employees at the site are not confirmed\r\n\r\nOthers\r\n- We measured radioactive materials inside of the nuclear power station\r\n  area (outdoor) by monitoring car and confirmed that radioactive\r\n  materials level is higher than ordinary level. Also, the level at\r\n  monitoring post is higher than ordinary level. We will continue to\r\n  monitor in detail the possibility of radioactive material being\r\n  discharged from exhaust stack or discharge canal. The national\r\n  government has instructed evacuation for those local residents within\r\n  20km radius of the periphery because it's possible that radioactive\r\n  materials are discharged.\r\n\r\n- We will continue to take all measures to restore the security of\r\n  the site and to monitor the environment of the site periphery.<\/pre>\n
Uppdatering 22:19<\/strong><\/p>\n
TEPCO sl\u00e4ppte just en ny statusuppdatering p\u00e5 reaktorerna i Fukushima 1<\/p>\n
http:\/\/www.tepco.co.jp\/en\/press\/corp-com\/release\/11031234-e.html<\/a><\/p>\n
 <\/a><\/p>\n
<\/a><\/p>\n
Unit 1(Shut down)\r\n- Reactor has been shut down. However, the unit is under inspection due\r\n  to the explosive sound and white smoke that was confirmed after the big\r\n  quake occurred at 3:36PM.\r\n- Also, we have been injecting sea water into the reactor core and then\r\n  boric acid which absorbs neutron. However, we tentatively ceased the\r\n  operation factoring in the impact of potential tsunami following the\r\n  earthquake which occurred at 10:15PM. \r\n\r\nUnit 2(Shut down)\r\n- Reactor and Reactor Core Isolation Cooling System have been shut down.\r\n  Current reactor water level is lower than normal level, but the water\r\n  level is steady. After fully securing safety, we are preparing to\r\n  implement a measure to reduce the pressure of the reactor containment\r\n  vessels under the instruction of the national government. \r\n\r\nUnit 3(Shut down)\r\n- Reactor has been shut down and we continue injecting water by High\r\n  Pressure Core Injection System. After fully securing safety, we are\r\n  preparing to implement a measure to reduce the pressure of the reactor\r\n  containment vessels under the instruction of the national government.\r\n- Currently, we do not believe there is any reactor coolant leakage\r\n  inside the reactor containment vessel.<\/pre>\n
Uppdatering 21:36<\/strong><\/p>\n
Det har klarnat lite sen imorse. Vi blev nog alla skakade n\u00e4r man s\u00e5g byggnaden flyga i luften men hittills har explosionen inte haft n\u00e5gra k\u00e4nda konsekvenser p\u00e5 reaktorn. Det som tydligen h\u00e4nt \u00e4r att en v\u00e4tgasexplosion skett i reaktorbyggnaden utanf\u00f6r inneslutningen av reaktorn. Inneslutningen och reaktorn \u00e4r dock \u00e4nnu intakt och inget st\u00f6rre l\u00e4ckage av radioaktiva \u00e4mnen har uppm\u00e4tts. Tydligen har det skett en partiell h\u00e4rdsm\u00e4lta med utsl\u00e4pp av cesium vilket inneb\u00e4r att olyckan nu rankas som en 4a p\u00e5\u00a0INES skalan<\/a>. Det \u00e4r ett sn\u00e4pp under Harrisburgolyckan. V\u00e4tgasen har f\u00f6rmodligen uppkommit pga den partiella h\u00e4rdsm\u00e4lta, sen ventilerats ut fr\u00e5n inneslutningen, blandats med luften utanf\u00f6r och exploderat.\u00a0Man har f\u00f6r n\u00e5gra timmar sedan b\u00f6rjat fylla inneslutningen med havsvatten f\u00f6r att l\u00e5ngsiktigt h\u00e5lla allting kylt. Om den processen fortg\u00e5r utan incidenter s\u00e5 kan f\u00f6rhoppningsvis dramatiken vid Fukushima 1 vara \u00f6ver. De planerar att ha fyllt inneslutningen helt och h\u00e5llet till s\u00f6ndag morgon japansk tid.<\/p>\n
Magnituden av utsl\u00e4ppen fr\u00e5n den partiella h\u00e4rdsm\u00e4ltan j\u00e4mf\u00f6rs med en tidigare incident vid Tokaimura br\u00e4nslefabriken. En arbetare vid Fukushima<\/a> har exponerats f\u00f6r en str\u00e5ldos p\u00e5 ca 100 mSv. Den str\u00e5ldos som en vanlig svensk uts\u00e4tts f\u00f6r p\u00e5 grund av naturliga str\u00e5lk\u00e4llor(radon, kosmisk str\u00e5lning etc) i Sverige \u00e4r som j\u00e4mf\u00f6relse runt 3-5 mSv och i vissa delar av v\u00e4rlden kan den uppg\u00e5 till n\u00e4rmare 100 mSv. Ventilering av inneslutningen sker d\u00e5 det beh\u00f6vs och verkar fungera<\/a>.<\/p>\n
Vid den andra reaktorn i Fukushima 1 s\u00e5 ligger vattenniv\u00e5n l\u00e5gt men stabilt och TEPCO rapporterar att att l\u00e4get \u00e4r under kontroll. I den tredje reaktorn \u00e4r det tydligen inte heller n\u00e5gra problem att h\u00e5lla vattenniv\u00e5erna. I b\u00e5da reaktorerna \u00e4r man f\u00f6rberedd att ventilera inneslutningarna ifall det kr\u00e4vs.
\nVid Fukushima 2 har man tydligen \u00e4ven problem med kylningen av reaktorerna enligt TEPCO’s senaste statusuppdatering<\/p>\n
http:\/\/www.tepco.co.jp\/en\/press\/corp-com\/release\/11031233-e.html<\/a><\/p>\n
Men det verkar som att alla blocken vid Fukushima 2 har tillg\u00e5ng till elektricitet och kan d\u00e4rmed driva pumpar odyl. Man f\u00f6rbereder sig inf\u00f6r m\u00f6jligheten att ventilera inneslutningarna vid de reaktorerna om trycket stiger f\u00f6r mycket.<\/p>\n
Man m\u00e5ste appl\u00e5dera det enast\u00e5ende jobb som TEPCO’s anst\u00e4llda har lyckats med i det h\u00e4r l\u00e4get. O<\/strong>m allting klaffar nu, om p\u00e5fyllnaden med havsvatten fungerar.<\/strong> D\u00e5 kan vi alla pusta ut. D\u00e5 har en 40 \u00e5r gammal reaktor och dess inneslutning visat sig kunna klara en magnitud 8.9 jordb\u00e4vning, total f\u00f6rlust av elektricitet, f\u00f6rlust av kylmedel och d\u00e4refter en explosion stark nog f\u00f6r att demolera reaktorbyggnaden ovanf\u00f6r. \u00c4nnu ska man inte ta ut n\u00e5gon seger, men just nu ser det lovande ut. F\u00f6r varje timme som g\u00e5r s\u00e5 sjunker resteffekten, vid det h\u00e4r laget \u00e4r den mindre \u00e4n en halv % av maxeffekt. Ju l\u00e4gre den blir ju mindre \u00e4r risken f\u00f6r en h\u00e4rdsm\u00e4lta n\u00e4r kylningen har problem.<\/p>\n
NEI har en v\u00e4ldigt bra uppf\u00f6ljning av h\u00e4ndelsen med bra information
\nhttp:\/\/www.nei.org\/newsandevents\/information-on-the-japanese-earthquake-and-reactors-in-that-region<\/a><\/p>\n
H\u00e4r nedan kommer Kyodo’s senaste artikel om h\u00e4ndelserna. V\u00e4ldigt bra sammanfattning.
\nhttp:\/\/english.kyodonews.jp\/news\/2011\/03\/77204.html<\/a><\/p>\n
Explosion did not occur at reactor, new cooling operation begins<\/strong><\/p>\n
TOKYO, March 13, Kyodo<\/p>\n
Japanese authorities have confirmed there was an explosion at the Fukushima No. 1 nuclear power plant Saturday afternoon but said it did not occur at its troubled No. 1 reactor, brushing off concerns that the quake-triggered problem could develop into a catastrophe.<\/p>\n
Chief Cabinet secretary Yukio Edano told an urgent press conference that the operator, Tokyo Electric Power Co., has confirmed there is no damage to the steel container housing the reactor, although the 3:36 p.m. explosion resulted in the roof and the walls of the building housing the reactor’s container being blown away.<\/p>\n
The top government spokesman said TEPCO has begun new cooling operations to fill the reactor with sea water and pour in boric acid to prevent an occurrence of criticality, noting it may take several hours to inject water into the reactor.<\/p>\n
In addition, it will take about 10 days to fill the container with sea water, he said. There is a great possibility that the reactor will be decommissioned as the injection of sea water containing salt and impure substances will make it difficult to operate it safely again, experts say.<\/p>\n
TEPCO’s Fukushima No. 1 and No. 2 plants have lost their cooling functions after the area was jolted by a magnitude 8.8 earthquake Friday.<\/p>\n
Due to failure to cool down the No. 1 reactor at the Fukushima No. 1 plant, radioactive cesium and iodine were detected near the facility Saturday.<\/p>\n
The detection of the materials, which are created following atomic fission, led Japan’s nuclear safety agency to admit the reactor had partially melted — the first such case in Japan.<\/p>\n
Following the blast that occurred as vapor from the container of the No. 1 reactor turned into hydrogen and mixed with outside oxygen, Edano said the authorities expanded from 10 kilometers to 20 km the radius of the area to be evacuated by residents living in the vicinity of the Fukushima plants as a precaution.<\/p>\n
Three people had their clothes contaminated with radioactive substances while fleeing from the No. 1 nuclear plant Saturday afternoon, according to the Fukushima prefectural government.<\/p>\n
The nuclear safety agency said no decontamination work is needed for them, but asked the Self-Defense Forces to check whether 87 others who were vacating the area with the three have been exposed to radiation.<\/p>\n
Officials of the Nuclear and Industrial Safety Agency said new cooling operations have so far been proceeding smoothly, and the melting of the core has not been aggravated.<\/p>\n
The melting temperature for pellets containing cesium, a nuclear fissile material, is around 2,800 degrees Celsius and the release of celsium indicates that the reactor has heated up significantly.<\/p>\n
A partial core meltdown occurred in a major nuclear accident at Three Mile Island in the United States in 1979. About 45 percent of nuclear fuels melted in the incident, causing radioactive materials to be released.<\/p>\n
The Fukushima prefectural government said the hourly radiation from the No. 1 plant reached 1,015 micro sievert before the explosion, an amount equivalent to that permissible for a person in one year.<\/p>\n
Four workers — two from the company and two others from another firm — were injured in the explosion, TEPCO said. The four were working to deal with problems caused by the powerful quake, but their injuries are not life-threatening and they are conscious, it added.<\/p>\n
TEPCO also reported the detection of high radiation levels to the state as required by a domestic law.<\/p>\n
The nuclear agency officials said the severity of the radioactive leak this time is around the same level as a 1999 accident at a nuclear fuel processing plant run by JCO Co. in Tokaimura, Ibaraki Prefecture, in which a nuclear fission chain reaction could not be contained for nearly a full day.<\/p>\n
The two incidents are less severe than the accidents at atomic power reactors in Chernobyl in the Soviet Union in 1986 and on Three Mile Island, they said.<\/p>\n
Before the explosion, TEPCO successfully released pressure in the container of the No. 1 reactor to prevent a nuclear meltdown.<\/p>\n
The depressurizing work involved the release of steam that includes radioactive materials. It is aimed at preventing the reactor containers from sustaining damage and losing their critical containment function. The government issued an unprecedented order for this to be carried out at the Fukushima No. 1 and No. 2 plants.<\/p>\n
The nuclear agency said as a result of reducing the container’s pressure at the No. 1 plant, radioactive levels at the plant briefly went up.<\/p>\n
It denied that the radiation amount will pose an immediate threat to the health of nearby residents, as the wind was blowing toward the sea in the Pacific coast town in northeastern Japan.<\/p>\n
==Kyodo<\/p>\n
L\u00e4nkar<\/p>\n
http:\/\/www.svd.se\/nyheter\/utrikes\/svd-rapporterar-minut-for-minut_6001491.svd<\/a><\/p>\n
http:\/\/www.svd.se\/ego\/mainColumn_s185\/http:\/\/www.svd.se\/nyheter\/utrikes\/taket-flog-i-luften-pa-karnkraftverket_6002383.svd<\/a><\/p>\n
http:\/\/www.dn.se\/nyheter\/varlden\/hardsmalta-befaras-i-japan<\/a><\/p>\n
http:\/\/www.aftonbladet.se\/nyheter\/article8703357.ab<\/a><\/p>\n
http:\/\/www3.nhk.or.jp\/daily\/english\/12_56.html<\/a><\/p>\n
http:\/\/www3.nhk.or.jp\/daily\/english\/13_01.html<\/a><\/p>\n
http:\/\/www.tepco.co.jp\/en\/press\/corp-com\/release\/index-e.html<\/a><\/p>\n
http:\/\/www.svd.se\/nyheter\/inrikes\/chatta-om-karnkraft_6003053.svd<\/a><\/p>\n
http:\/\/www.svd.se\/ego\/mainColumn_s185\/http:\/\/www.svd.se\/nyheter\/utrikes\/svd-rapporterar-minut-for-minut_6002845.svd<\/a><\/p>\n
http:\/\/www.dn.se\/nyheter\/varlden\/han-flyr-fran-karnkraftverket<\/a><\/p>\n
http:\/\/www.dn.se\/nyheter\/varlden\/japanska-regeringen-hardsmalta-kan-ha-intraffat<\/a><\/p>\n
http:\/\/www.dn.se\/ledare\/huvudledare\/japans-nod-ar-var<\/a><\/p>\n
http:\/\/www.svd.se\/nyheter\/inrikes\/chatta-om-karnkraft_6003053.svd<\/a><\/p>\n","protected":false},"excerpt":{"rendered":"
Uppdatering 21:48 Det finns inte s\u00e5 mycket att s\u00e4ga just nu. TEPCO har inte gett n\u00e5gra nya uppdateringar. JAEA’s hemsida \u00e4r nere, ingen tidning skriver…<\/p>\n
Continue readingL\u00e4get verkar ha stabiliserats f\u00f6r stunden<\/span><\/a><\/div>\n","protected":false},"author":2,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[1],"tags":[],"_links":{"self":[{"href":"https:\/\/nuclearpoweryesplease.org\/blog\/wp-json\/wp\/v2\/posts\/1446"}],"collection":[{"href":"https:\/\/nuclearpoweryesplease.org\/blog\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/nuclearpoweryesplease.org\/blog\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/nuclearpoweryesplease.org\/blog\/wp-json\/wp\/v2\/users\/2"}],"replies":[{"embeddable":true,"href":"https:\/\/nuclearpoweryesplease.org\/blog\/wp-json\/wp\/v2\/comments?post=1446"}],"version-history":[{"count":46,"href":"https:\/\/nuclearpoweryesplease.org\/blog\/wp-json\/wp\/v2\/posts\/1446\/revisions"}],"predecessor-version":[{"id":1448,"href":"https:\/\/nuclearpoweryesplease.org\/blog\/wp-json\/wp\/v2\/posts\/1446\/revisions\/1448"}],"wp:attachment":[{"href":"https:\/\/nuclearpoweryesplease.org\/blog\/wp-json\/wp\/v2\/media?parent=1446"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/nuclearpoweryesplease.org\/blog\/wp-json\/wp\/v2\/categories?post=1446"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/nuclearpoweryesplease.org\/blog\/wp-json\/wp\/v2\/tags?post=1446"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}
http:\/\/www.tepco.co.jp\/en\/press\/corp-com\/release\/11031301-e.html<\/a><\/p>\n