[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

 

 

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