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Tepco decreased Nitrogen gas injection to reactor1 → (26 hours later) reactor temperature rose up by 8℃

For some reason, reactor1 gets heated up once Tepco stops nitrogen gas injection. In order to purge hydrogen gas that may cause hydrogen gas explosion, Tepco is injecting nitrogen gas

Core removing struggle Plant hazard

今日のおもしろにぅす ー1号機はなかば窒素注入による空冷式で温度が保たれてる状態にあることが分かってしまった

This is not so new for English readers. It’s to help Japanese readers understand the situation well.     http://fukushima-diary.com/2012/04/reactor-1-goes-over-100%E2%84%83-within-8-hours-without-nitrogen-injection/ http://www.tepco.co.jp/nu/fukushima-np/roadmap/images/m121203_03-j.pdf http://www.tepco.co.jp/nu/fukushima-np/handouts/2013/images/handouts_130617_02-j.pdf http://www.tepco.co.jp/nu/fukushima-np/handouts/2013/images/handouts_130628_03-j.pdf     Iori Mochizuki   “I’ll be

Core removing struggle Plant hazard

Tepco to finally investigate why reactor1 temperature goes up when they stop nitrogen gas injection

Tepco is finally going to investigate the connection between the nitrogen gas injection and the PCV temperature of reactor1. Since April of 2012, Fukushima Diary has been reporting that the

Core removing struggle

[Mysterious reactor2] Tepco couldn’t purge hydrogen gas from suppression chamber

Tepco injected nitrogen gas into the suppression chamber of reactor2 from 5/14 to 5/17/2013. (cf, Tepco to start nitrogen gas injection into reactor2 for the first time, “Not knowing the

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[Reactor2] Air pressure of Suppression Chamber was lower than Dry Well, “can’t purge hydrogen gas”

On 5/13/2013, Fukushima Diary reported “Tepco to start nitrogen gas injection into reactor2 for the first time, “Not knowing the hydrogen gas concentration” [URL]” Tepco is attempting purging hydrogen gas

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Tepco to start nitrogen gas injection into reactor2 for the first time, “Not knowing the hydrogen gas concentration”

Tepco is going to inject nitrogen gas into reactor2 suppression chamber as a test. They need to keep the hydrogen gas concentration lower than 2% or it may cause hydrogen

Core removing struggle

Tepco to restart nitrogen gas injection into reactor1

According to Tepco, they are going to restart the nitrogen gas injection into the suppression chamber of reactor1 on 5/8/2013. 6~7m3/h will be injected in order to “push out the

Core removing struggle

Tepco to restart nitrogen injection to reactor1, “The volume of gas is 40% more than last time”

According to Tepco, they are going to restart nitrogen injection into the suppression chamber of reactor1. 6~7m3/h will be injected in order to “push out the retained hydrogen gas” and

Core removing struggle

The purpose of nitrogen injection to reactor1 is “to confirm the impact of the radiolysis of water inside the PCV”

On 2/25/2013, Fukushima Diary reported Tepco was going to restart the nitrogen gas injection into PCV of reactor1. [URL 1] On 2/26/2013, Tepco reported the purpose is to confirm the

Core removing struggle

Tepco to restart nitrogen gas injection into reactor1 again

From 2/26/2013, Tepco is going to restart injecting nitrogen gas into S/C of reactor1. (5m3/h) S/C is a part of PCV. If the hydrogen gas density goes over 2%, there