【政治経済】平成床屋談義 町の噂その403
>>719は日本語版WSJの記事。英語版の同じ記事は、より詳しいもので、何故ベンティングが遅れたかの考察がある。
日本語版が詳細を省いた理由はよくわからないけれど、省くべきではないように思える。
ttp://online.wsj.com/article/SB10001424052748703922504576273234110896182.html?mod=WSJ_hp_us_mostpop_read
Reactor Team Let Pressure Soar By PHRED DVORAK
The controversy has reached Japan's embattled Prime Minister Naoto Kan. Shortly after 7 a.m. that same morning,
Mr. Kan paid a 50-minute visit to the Fukushima Daiichi grounds and held a meeting there with plant executives.
Opposition lawmakers have argued that his visit distracted plant managers, while Mr. Kan's supporters say he
pushed to accelerate venting.
Manufacturers of nuclear reactors build the containment vessels that surround the core at a "design pressure" the
units are capable of withstanding without breaking, under all the conditions envisioned for the plant's life.
Those include all but the most severe accidents.
U.S. protocols on handling accidents at similar reactors call for venting before pressure exceeds the design level.
The same protocol is followed by plant operators using similar types of reactors in Korea and Taiwan, industry experts
in those countries say.
The U.S. approach allows for a faster response in crisis conditions, and accepts the radiation released as part of
venting as the price of possibly preventing a larger release.
One significant passage in the U.S. protocol says a reactor should be vented even if that results in "exceeding offsite
radioactivity release rate limits"?in other words, shooting more radiation into the environment than is allowed?say
people familiar with the protocol.
Another key difference: U.S. rules put the person at the controls of the plant in charge of venting. In Japan, it is
common for operators to bump the decision to company or government superiors when there is a chance radiation will
be released.
Several of those factors came into play in the early hours of March 12. Industry experts in the U.S. and other countries
say that during the early hours after power and cooling systems were lost at reactor No. 1, overheating fuel rods in
the reactor produced hydrogen gas and increased the pressure within the reactor and its containment vessel.
日本語版が詳細を省いた理由はよくわからないけれど、省くべきではないように思える。
ttp://online.wsj.com/article/SB10001424052748703922504576273234110896182.html?mod=WSJ_hp_us_mostpop_read
Reactor Team Let Pressure Soar By PHRED DVORAK
The controversy has reached Japan's embattled Prime Minister Naoto Kan. Shortly after 7 a.m. that same morning,
Mr. Kan paid a 50-minute visit to the Fukushima Daiichi grounds and held a meeting there with plant executives.
Opposition lawmakers have argued that his visit distracted plant managers, while Mr. Kan's supporters say he
pushed to accelerate venting.
Manufacturers of nuclear reactors build the containment vessels that surround the core at a "design pressure" the
units are capable of withstanding without breaking, under all the conditions envisioned for the plant's life.
Those include all but the most severe accidents.
U.S. protocols on handling accidents at similar reactors call for venting before pressure exceeds the design level.
The same protocol is followed by plant operators using similar types of reactors in Korea and Taiwan, industry experts
in those countries say.
The U.S. approach allows for a faster response in crisis conditions, and accepts the radiation released as part of
venting as the price of possibly preventing a larger release.
One significant passage in the U.S. protocol says a reactor should be vented even if that results in "exceeding offsite
radioactivity release rate limits"?in other words, shooting more radiation into the environment than is allowed?say
people familiar with the protocol.
Another key difference: U.S. rules put the person at the controls of the plant in charge of venting. In Japan, it is
common for operators to bump the decision to company or government superiors when there is a chance radiation will
be released.
Several of those factors came into play in the early hours of March 12. Industry experts in the U.S. and other countries
say that during the early hours after power and cooling systems were lost at reactor No. 1, overheating fuel rods in
the reactor produced hydrogen gas and increased the pressure within the reactor and its containment vessel.
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