The safety and regulation of the Japanese nuclear fleet is called into serious question by the discovery of Japanese-manufactured flawed steel components installed in operating French nuclear reactors forced to shut down last week by the French nuclear safety regulator ASN, according to a new Greenpeace report. The threat to nuclear reactor safety in Japan is due to the supply of steel components to the nuclear industry from both Japan Casting and Forging Company (JCFC) and the Japan Steel Works (JSW), according to the technical report released today by Greenpeace Japan, by the nuclear engineering consultancy, Large&Associates of London. Evidence of astonishingly high levels of excess carbon far outside regulatory limits with the associated loss of steel toughness and significant increase in the risk of catastrophic failure of primary containment components, have been discovered in JCFC-manufactured components installed in steam generators in 12 reactors owned by the French state-utility, EdF. The independent French nuclear agency, IRSN, recently warned that due to the excess carbon content, there was an increased risk of failure of the affected steam generator leading to a potential reactor core meltdown. “As a result of substandard manufacturing in Japan, citizens in France have been unknowingly exposed to the risk of catastrophic failure of critical reactor components which could result in a reactor core meltdown. Japanese-supplied steel is now at the center of France’s unprecedented nuclear crisis the scale of which has never been seen in any country. All 12 reactors supplied by JCFC are either in forced shutdown or about to be. It lacks all credibility that the Japanese nuclear industry would claim that there are no implications for the safety of their own nuclear reactors. The steel production records released in France did not reveal the scale of excess carbon, which was only found after physical testing. There are currently no plans for such tests in Japan. That is wholly unacceptable. There are many urgent questions that need to be answered by the industry and the NRA, and with full public disclosure and transparency,” said Shaun Burnie, senior nuclear specialist at Greenpeace Germany.
Greenpeace Japan 25th Oct 2016 read more »