Tag "RPV"

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Core removing struggle Plant hazard

Tepco eliminated another thermometer of reactor2 / “Because it indicates rapid change of the temperature”

According to Tepco, they eliminated another thermometer of reactor2. It’s to indicate the temperature of the stud on the RPV flange. Now they have only 10 thermometers remain in RPV

Core removing struggle

[Steaming reactor3] Tepco “The steam may be from the inside of the reactor, a certain volume of N2 gas is missing”

Following up this article..[Steaming reactor3] Thermography shows the steaming area is over 15℃ hotter than atmosphere [URL] On 7/26/2013, Tepco announced the “steam” may be from the inside of the

Core removing struggle

[Breaking] 2.2 Sv/h from the top of reactor3, 562 mSv/h from the steam

Following up this article..[Nothing settled] Steam from reactor3 again [URL] According to Tepco, they measured extremely high level of radiation on the top of reactor3. On 7/23/2013, Tepco measured the

Core removing struggle

Cs-134 detected from “steam” in reactor3 / Tepco “not sure if it was rain”

Following up this article..[Steaming reactor3] Tepco “The steam is the heated rain, same thing happened last year but didn’t report it” [URL] According to Tepco, the steam was not observed

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

No temperature change in reactor1 after reducing nitrogen gas into the PCV

Following up this article..Tepco to finally investigate why reactor1 temperature goes up when they stop nitrogen gas injection [URL] According to Tepco, they are reducing the nitrogen gas volume to

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 Natural disasters Plant hazard

Reactor2 temperature spiked up by 30℃ after M5.5 of 4/14/2013, Tepco “The thermometer has low credibility”

According to Tepco, one of the thermometers of reactor2 indicated the spiking up of temperature after the major earthquake of 4/14/2013. The location of the thermometer is RPV bellows seal

Core removing struggle

1 Sv/h in PCV of reactor2, “reaches the fatal dose in 7 hours”

On 3/19/2013, Tepco tried to investigate inside of RPV of reactor2 by the camera, dosimeter and thermometer like the picture below.   Tepco was planning to put the camera on

Core removing struggle Plant hazard

Reactor2 temperature is increasing again

According to Tepco, one of the thermometers of RPV in reactor2 is indicating the increase of temperature again. Tepco hasn’t announced it’s disordered yet.     http://www.tepco.co.jp/en/nu/fukushima-np/f1/pla/2013/images/data_2u_g-e.pdf http://www.tepco.co.jp/en/nu/fukushima-np/f1/pla/2012/images/figure-e.pdf