Overblog
Editer l'article Suivre ce blog Administration + Créer mon blog
Le blog de fukushima-is-still-news

information about Fukushima published in English in Japanese media info publiée en anglais dans la presse japonaise

Checking weak (French) steel in all reactors

September 2, 2016

Steel in Troubled French Nuclear Reactor Used in Japanese Plants

http://www.bloomberg.com/news/articles/2016-09-02/steel-in-troubled-french-nuclear-reactor-used-in-japanese-plants

Stephen Stapczynski Emi Urabe

September 2, 2016 — 2:36 PM CEST

Thirteen Japanese nuclear reactors were constructed with steel from the same company used in a French power plant that’s under scrutiny for anomalies found in the reactor vessel’s structure.

Six utilities used steel from Japan Casting & Forging Corp., they all said in separate statements on Friday. The steelmaker was identified by Japanese authorities last month as supplying steel to the Flamanville nuclear plant, developed by Electricite de France SA and Areva SA, where the French safety authority last year found weaker-than-expected steel.

Japan’s nuclear regulators asked utilities last month to examine reactor parts manufactured by the same companies as the Flamanville facility. Utilities must now evaluate whether their reactor pressure vessels meet Japan’s standards and report the results to the Nuclear Regulation Authority by Oct. 31.

The Japanese facilities affected include Kyushu Electric Power Co.’s Sendai No. 1 and 2 reactors, the company said Friday. The plant was restarted last year and is facing opposition from the region’s new governor, who has demanded they be temporarily shut for inspections.

Reactors that are currently operating don’t need to be shut down, Yoko Kobayashi, an official with the NRA’s planning division, said Friday. The affected utilities are now required to submit manufacturing reports and past evaluation results, she said.

Nuclear Challenge

The steel scrutiny is latest hurdle for nuclear power in Japan and the government’s goal of having it account for as much as 22 percent of its energy mix by 2030 in the wake of the 2011 Fukushima disaster. Local court challenges have threatened reactor operations, and even those restarted under new post-Fukushima safety rules have faced a rocky road. Only three of the nation’s 42 operable reactors are online.

Parts manufactured by JCFC met rigorous standards requested by the utilities, and the company will provide support going forward, Seigo Otsubo, an official at the company, said Friday.

EDF and Areva are conducting additional tests to determine whether the anomalies are a safety issue. The two companies said in April that the submission of their report to French regulators about the Flamanville reactor has been delayed until year-end.

EDF has also determined that steam generator channel heads at 18 French reactors contain anomalies similar to those at Flamanville, Autorite de Surete Nucleaire, the safety regulator, said in June.

Japanese reactors that used steel from JCFC, according to statements from the companies:

September 3, 2016

Utilities to check forged steel in all reactors

http://www3.nhk.or.jp/nhkworld/en/news/20160903_07/

Power utilities in Japan have found that all their reactors use steel components made in the same way as supposedly weak French products. They are now set to check the durability of the components in question.

The utilities examined the makers and production methods of key components at the instruction of Japan's Nuclear Regulation Authority. The results were announced on Friday.

The probe came after steel in some parts of reactor walls made in France was found to contain more carbon than it should. Steel with high carbon content can be damaged more easily.

The French products were made using the forging method. The Japanese utilities say all 46 reactors at their 18 nuclear plants used some parts made by forging.

Japanese regulators say the method itself is not a problem. But they say flawed manufacturing quality control could result in higher carbon content in products.

The utilities plan to examine production records and other factors to check the strength. They are to report the findings by the end of October.

Partager cet article
Repost0
Pour être informé des derniers articles, inscrivez vous :
Commenter cet article