{"id":2074,"date":"2011-03-26T13:50:30","date_gmt":"2011-03-26T11:50:30","guid":{"rendered":"http:\/\/nuclearpoweryesplease.org\/blog\/?p=2074"},"modified":"2013-03-01T00:44:33","modified_gmt":"2013-02-28T22:44:33","slug":"day-fifteen-after-the-tsunami","status":"publish","type":"post","link":"https:\/\/nuclearpoweryesplease.org\/blog\/2011\/03\/26\/day-fifteen-after-the-tsunami\/","title":{"rendered":"Day fifteen after the tsunami"},"content":{"rendered":"

Update 15:00(UTC)\/16:00(CET)\/00:00(JST)<\/strong><\/p>\n

NISA has released their update, link 1<\/a>, link 2<\/a>, link 3<\/a>. I have also reattached the earlier JAIF figures at the bottom of the last update to see if it will fix the bug that gives an error when one clicks on the pictures.<\/p>\n

As usual the NISA figures are between (). The NISA data is 3 hours older than the JAIF data.<\/p>\n

 <\/p>\n

Reactor 1:<\/strong>
\nWater level in the core: 1.65(1.65) \u00a0meters below the top of fuel assemblies
\nFlow rate of injected water: 7.2 cubic meters per hour
\nCore pressure: 476 (477) kPa
\nContainment pressure: 270 (270) kPa *note, in the last update I misstakenly wrote 370 kPa as containment pressure.<\/em>
\nCore temperature(feedwater nozzle): 195.3 Celsius
\nCore temperature(bottom head) 146.3 Celsius
\nDose rate within containment: 35.1 Sv\/hour<\/p>\n

Reactor 2:<\/strong>
\nWater level in the core: 1.1 (1.1) \u00a0meters below the top of fuel assemblies
\nFlow rate of injected water: 18.6 cubic meters per hour
\nCore pressure: unknown
\nContainment pressure: 116 (115) kPa
\nCore temperature(feedwater nozzle): 107 Celcius
\nCore temperature(bottom head):\u00a0100 Celsius
\nDose rate within containment: \u00a043.4 Sv\/hour
\nSpent fuel pool temperature: \u00a057 Celsius<\/p>\n

Reactor 3:<\/strong>
\nWater level in the core: 2.3 \u00a0meters below the top of fuel assemblies
\nFlow rate of injected water: 14.5 cubic meters per hour
\nCore pressure: 139 (139) kPa *note, I wrote the wrong pressure in the last update<\/em>
\nContainment pressure: 106.6 (106.6) kPa
\nCore temperature(feedwater nozzle): 37.6 Celsius (sounds like an error on equipment)
\nCore temperature(bottom head): 106.1 Celsius
\nDose rate within containment: \u00a036.1 Sv\/hour<\/p>\n

Due to my error with containment pressure in the last update I withdraw my speculation that its hard to control the pressure in number 1. Rather it seems like the situation is fairly stable. Otherwise not much new information.<\/p>\n

The US Department of Energy has done some arial surveys around Fukushima Daiichi and released the data. I have one pictures from it below(hats of to\u00a0http:\/\/neutroneconomy.blogspot.com\/<\/a> where I found the pictures). The dose rate unit used on the picture is millirad. 1 millirad=10 microgray =* 10 microsievert
\n*that equality between gray and sievert is only valid for gamma radiation. Gray measures the energy deposited while sievert is weighted in such a way that it expresses a cancer risk.\u00a0\u00a0For gamma the weighting factor is 1.<\/em><\/p>\n

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Update 12:00(UTC)\/13:00(CET)\/21:00(JST)<\/strong><\/p>\n

No NISA updates have been released yet today,\u00a0JAIF<\/a> has\u00a0released\u00a0their update as usual(one hour old as of writing this).<\/p>\n

Reactor 1:<\/strong>
\nWater level in the core: 1.65 \u00a0meters below the top of fuel assemblies
\nCore pressure: 476 kPa
\nContainment pressure: 370 kPa
\nCore temperature(feedwater nozzle): no new data
\nCore temperature(bottom head) no new data
\nDose rate within containment: \u00a0no new data<\/p>\n

Reactor 2:<\/strong>
\nWater level in the core: 1.1 \u00a0meters below the top of fuel assemblies
\nCore pressure: unknown
\nContainment pressure: 116 kPa
\nCore temperature(feedwater nozzle): no new data
\nCore temperature(bottom head) no new data
\nDose rate within containment: \u00a0no new data<\/p>\n

Reactor 3:<\/strong>
\nWater level in the core: 2.3 \u00a0meters below the top of fuel assemblies
\nCore pressure: 202 kPa
\nContainment pressure: 106.6 kPa
\nCore temperature(feedwater nozzle): no new data
\nCore temperature(bottom head) no new data
\nDose rate within containment: \u00a0no new data<\/p>\n

All 3 reactors are now cooled with freshwater instead of sea water. It seems hard for them to get the pressure in the number one reactor under complete control. In JAIF’s written update they say\u00a0lights are on in all control rooms<\/a> now. Levels of radioactive materials<\/a> in the seawater around the plant is climbing. TEPCO is releasing updates on activity in both sea and air, I have attached levels as pictures in the bottom of this update.<\/p>\n

The ground deposits of I-131 the prefectures around Fukushima ranges from less than 1 to 16 kBq per square meter. The cesium ground deposits ranges from less than 0.1 to 1.9 kBq per square meter(here are the last 3 MEXT updates on ground deposts\u00a0link 1<\/a>,\u00a0link 2<\/a>,\u00a0link 3<\/a>).\u00a0The data form the worst effected prefectures are however omitted, we hope MEXT will make those figures\u00a0available\u00a0asap! As a comparison the ground deposits of cesium due to Chernobyl<\/a> ranged from a couple of hundreds to a couple of thousand kBq per square meter.<\/p>\n

 <\/p>\n

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Update, March 26, 12:00 (UTC) \/ 13:00 (CET) \/ 21:00 (JST)<\/strong><\/p>\n

Not much to add today. The radiation levels in the sea outside Fukushima I are sky-high. The long term effects are hard to predict now since a sea contamination is entirly different from a land contamination, where land is basicly a 2D area, which leads to a thin and\u00a0high concentration on the surface, and where rains soon concentrate the contamination to “hotspots”.\u00a0\u00a0The sea on the other hand is a 3D volume where currents quickly dilute any contaminant by dispersing them over very wide areas.<\/p>\n

The JAIF updates from 10:00<\/a>, 16:00<\/a> and 21:00<\/a> (JST) for March 26 are pretty much uniform. The big news is that freshwater injection to the cores of 1, 2 and 3 has started as opposed to using\u00a0salty sea water. Apart from that nothing new. The radiation readings at the main gate (1 km out) has stayed at 170 \u03bcSv\/h all day. The west gate read 147 \u03bcSv\/h at 13:30.<\/p>\n

NISA has not said anything new since last night.<\/p>\n

 <\/p>\n

Links(english):
\nBBC We should stop running away from radiation<\/a>
\nHufftington post US brings fresh water to japan nuclear plant<\/a>
\nNY\u00a0Times Japan presses nuclear plant repair as more damage is found<\/a>
\nRod Adams\u00a0Shaken, flooded, stressed by power outages, Fukushima Daiichi moves into second place<\/a>
\nThe Independent\u00a0Fear and devastation on the road to Japan’s nuclear disaster zone<\/a><\/em><\/p>\n

Links(swedish):
\nR\u00f6da berge<\/a>t
\nDr Angels blog<\/a>
\nDN Radioaktivt jod tusen g\u00e5nger till\u00e5ten niv\u00e5 i havet<\/a>
\nAftonbladet\u00a0Str\u00e5lningen \u00f6kar runt Fukushima<\/a>
\nSvD\u00a0Radioaktivt vatten i reaktorer<\/a>
\nT\u00e4nkv\u00e4rt? Eller inte! <\/a>
\nGr\u00f6n horizont<\/a><\/p>\n

 <\/p>\n","protected":false},"excerpt":{"rendered":"

Update 15:00(UTC)\/16:00(CET)\/00:00(JST) NISA has released their update, link 1, link 2, link 3. I have also reattached the earlier JAIF figures at the bottom of…<\/p>\n

Continue readingDay fifteen after the tsunami<\/span><\/a><\/div>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[15,57,433],"tags":[427,690,437,687,455,434,482,4,435],"_links":{"self":[{"href":"https:\/\/nuclearpoweryesplease.org\/blog\/wp-json\/wp\/v2\/posts\/2074"}],"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\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/nuclearpoweryesplease.org\/blog\/wp-json\/wp\/v2\/comments?post=2074"}],"version-history":[{"count":23,"href":"https:\/\/nuclearpoweryesplease.org\/blog\/wp-json\/wp\/v2\/posts\/2074\/revisions"}],"predecessor-version":[{"id":2088,"href":"https:\/\/nuclearpoweryesplease.org\/blog\/wp-json\/wp\/v2\/posts\/2074\/revisions\/2088"}],"wp:attachment":[{"href":"https:\/\/nuclearpoweryesplease.org\/blog\/wp-json\/wp\/v2\/media?parent=2074"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/nuclearpoweryesplease.org\/blog\/wp-json\/wp\/v2\/categories?post=2074"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/nuclearpoweryesplease.org\/blog\/wp-json\/wp\/v2\/tags?post=2074"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}