Saturday, 8 June 2013

Fast Breeder Reactor Monju's Coolant Heating System Accidentally Switched Off

Saturday, June 8, 2013

Fast Breeder Reactor Monju's Coolant Heating System Accidentally Switched Off for 30 Minutes, No Effect on the Environment, Says JAEA

JAEA again, this time on the fast breeder reactor Monju that this agency "operates" (if it can be called "operating").

Coolant for Monju, sodium, is supposed to be kept at 200 degrees Celsius.

So what's the excuse this time?

Their manual was not well written!

Do you trust these people to run a nuclear reactor, not to mention fast breeder reactor that uses liquid metal that explodes on contact with water and ignites on contact with air?

Do you trust these people to export nuclear reactors all over the world, claiming the superior technology and know-hows, including know-hows from "lessons learned from the Fukushima I Nuke Plant accident"?

Good luck, Czech Republic. Good luck, India, Vietnam, and Turkey.

From Kyodo News (6/8/2013):
もんじゅ、ヒーター停止 ナトリウム一時保温できず

Monju's heater stopped, sodium wasn't kept warm enough temporarily

 日本原子力研究開発機構は7日、高速増殖炉原型炉もんじゅ(福井県敦賀市)で2日、電源設備の点検作業中に、2次系冷却材ナトリウムの温度を保つヒーターを誤って約30分間停止させたと発表した。手順書の不備による作業ミスなどが原因とみられる。

Japan Atomic Energy Agency (JAEA) announced on June 7 that at Fast Breeder Reactor Monju (Tsuruga City, Fukui Prefecture) the heater to keep the secondary coolant, sodium, warm was switched off accidentally for about 30 minutes during the inspection of electric systems on June 2. The cause is attributed to human error due to poor instructions in the manual.

 一部の配管で、ナトリウムは本来の200度から約40度下がったが、環境や原子炉への影響はなかったとしている。ナトリウムの融点は98度程度。

In certain part of the pipe, the temperature dropped 40 degrees Celsius from the normal 200 degrees Celsius, but there was no effect on the environment or the reactor, according to JAEA. Melting point of sodium is about 98 degrees Celsius.

 原子力規制庁や福井県、敦賀市には3日に通報した。公表が遅れた理由について原子力機構は「内規で通報が不要な軽微以下の事案だったため」としている。

JAEA reported to the Nuclear Regulatory Agency, Fukui Prefecture and Tsuruga City on June 3. The reason for the delay in reporting was, according to JAEA, because "it was the very minor incident that didn't require reporting, according to our internal [i.e. unofficial] rules".


So they blame the manual for the incident, but abide by the other, unofficial manual and decide they don't need to report it.

If they didn't notice the heater was off for another hour, they would have been in a big trouble (assuming the temperature drop is linear).

The footage of 1995 sodium leak accident is still there on the net, despite TV Asahi's copyright claim.

The Nuclear Regulatory Authority has already ordered JAEA to stop all the work for preparation for the restart, as 10,000 parts and equipments weren't maintained according to the schedule.

Again, good luck Czech Republic, India, Vietnam, Turkey. And many others, no doubt, now that Japan's Prime Minister Abe and President Francois Hollande of France have formed a formidable team to sell nuclear plants all over the world...

http://ex-skf.blogspot.fr/2013/06/fast-breeder-reactor-monjus-coolant.html?m=1

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