[Reactor4] Back-up coolant system failed. Backup power is lost. 47 hours left.

Following up this article..[Reactor4] Coolant system of SFP4 stopped. Tepco is still investigating the cause.

 

The coolant system is not functioning yet and the back-up unit is out of order too.

Japanese freelance journalist and comedian, Oshidori received emergency emails from Tepco to follow up.

 

 

<Translate> Control panel indicated the disorder of UPS (Uninterruptible Power Supply), UPS bypass power supply, heat exchange unit A/B trip. Tepco is still investigating the cause. <End>          

<Translate>

At 16:00, the water temperature of SFP4 is 35.8℃ (indicated by the temporary thermometer). It’s estimated to take 60 hours to reach 65℃, which is the safety limit. They are still investigating at the moment. will update by email.

<End>

<Translate>

UPS (Uninterruptible Power Supply) is interrupted to alart.

Alart : UPS bypass power supply, heat exchange unit A/B trip, heat exchange unit A/B circuit pump trip

Mail received at 16:41 6/30/2012

<End>

 

Tokyo newspaper reported, the back-up coolant unit doesn’t work, water temperature increases at 0.26℃/h. It was 35.8℃ at 16:00 of 6/30/2012. [Link]

 

Jiji reported both of the pumps stopped, UPS (Uninterruptible Power Supply) has gone out of order. The water temperature was 36.6℃ at 18:00 of 6/30/2012. [Link]

 

Though these 2 newspapers slightly contradict each other, based on what Tokyo newspaper reported, the water temperature increases at 0.5℃/h, it reaches 65℃ at 2:00 of 7/3/2012, and goes over 100℃ at 24:00 of 7/5/2012 roughly estimated. (JST)

However, it excludes the facts that the coolant water decreases as it evaporates and atmospheric temperature rises in day time, it may be faster.

[Reactor4] Back-up coolant system failed. Backup power is lost. 47 hours left.

 

[Reactor4] Back-up coolant system failed. Backup power is lost. 47 hours left. 2

 

[Reactor4] Back-up coolant system failed. Backup power is lost. 47 hours left. 3

 

[Reactor4] Back-up coolant system failed. Backup power is lost. 47 hours left. 4

 

[Reactor4] Back-up coolant system failed. Backup power is lost. 47 hours left. 5

 

[Reactor4] Back-up coolant system failed. Backup power is lost. 47 hours left. 6

 

 

About this site

This website updates the latest news about the Fukushima nuclear plant and also archives the past news from 2011. Because it's always updated and added live, articles, categories and the tags are not necessarily fitted in the latest format.
I am the writer of this website. About page remains in 2014. This is because my memory about 311 was clearer than now, 2023, and I think it can have a historical value. Now I'm living in Romania with 3 cats as an independent data scientist.
Actually, nothing has progressed in the plant since 2011. We still don't even know what is going on inside. They must keep cooling the crippled reactors by water, but additionally groundwater keeps flowing into the reactor buildings from the broken parts. This is why highly contaminated water is always produced more than it can circulate. Tepco is planning to officially discharge this water to the Pacific but Tritium is still remaining in it. They dilute this with seawater so that it is legally safe, but scientifically the same amount of radioactive tritium is contained. They say it is safe to discharge, but none of them have drunk it.

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