>> UPDATED: Tepco: Cooling system back on at Spent Fuel Pool No. 4 <<
“The cooling system [...] suspended operation Saturday [...] at around 6:25 a.m. [...] The water temperature of the pool was 31 C at the time of the suspension” -Kyodo
“The temperature of the pool rose 0.26 C per hour by late Saturday afternoon, according to the utility.” -Marketwatch
In 11.5 hours the temperature rose from 31 C to 36.6 C, or 5.6 C. This is a rate of 0.487 C per hour, nearly double the 0.26 C that Tepco reported.
If temperature continues rising at 0.487 C per hour:
- Saturday at 18:00 JST: 28.4 degrees until safety limit reached
- A 28.4 degree increase will take 58 hours and 20 minutes if rising at 0.487 C per hour
- 58 hours and 20 minutes from 18:00 JST on Saturday = Safety limit reached Tuesday morning around 4:00a JST
Interesting that the above result of Tuesday morning is the same reached in the Marketwatch report (“could reach… upper limit… on Tuesday morning”) where the 0.26 C per hour increase rate was used vs. the 0.487 C used above.
Published: June 30th, 2012 at 5:15 pm ET
- WSJ: Temperature rising at No. 4 fuel pool — Safety limit to be exceeded Tuesday morning? June 30, 2012
- Tepco Press Conference: Temperature rises at No. 4 Spent Fuel Pool, now around 50°C April 13, 2012
- Temperature spikes in No. 4 fuel pool after pump burns — Backup also breaks June 6, 2012
- Temperature rising in No. 4 spent fuel pool despite increased water injections (VIDEO) April 25, 2011
- No. 4 fuel pool temperature began spiking June 2 — No daily ‘Plant Status’ reports from Tepco since June 6, 2012