for Japanese


25 November, 2016

NRA Ascertains Domestic NPP Components to Be Sufficiently Strong

Recently, doubts were cast about the strength of equipment made for use in a French nuclear power plant by the Japan Casting & Forging Corporation (JCFC), a major manufacturer of large-forged steel products for NPPs.

The claim was that the steel in the JCFC-made products was too weak for use in NPP safety-related systems.

On November 22, however, at a regular meeting of Japan’s Nuclear Regulation Authority (NRA), it was determined that it was “unlikely that any of the products” used by eleven domestic power companies in their plants “contained carbon concentrations higher than prescribed limits” for safety-related systems.

The NRA thus concluded that there was no possibility of “weaker-than-expected performance” of such products in any domestic NPP.

The NRA found that JCFC adequately slices off those parts of its steel ingots (used to then make its products) that contain high concentrations of carbon, a cause of insufficient strength. Accordingly, it determined that the products in question were sufficiently strong, using the phrase, “no shortage of strength.”

It also evaluated and came to the same conclusion for NPP safety-related systems produced by other domestic manufacturers, including Japan Steel Works, Ltd. (JSW).

According to reports from the power utilities, JCFC manufactured vessel heads for eleven NPPs at seven NPP sites, including Takahama-2, owned and operated by the Kansai Electric Power Co. (Kansai EP), and two NPPs that are slated to be commissioned, namely, Kansai EP’s Mihama-2, as well as Genkai-1, owned and operated by the Kyushu Electric Power Co. No problems were found at any of those reactors.

That resolves the issue of “carbon segregation” at domestic NPPs for the time being. The NRA will, however, further pursue issues of product quality involving the homogeneity of chemical components in forged steel products, including gathering relevant information.


This site uses Akismet to reduce spam. Learn how your comment data is processed.

SNS facebooktwitter

NPPs Map


“The current situation at Fukushima Daiichi NPS” -From 3.11 toward the future- (ver, Jan. 2020)

23 January, 2020
“The current situation at Fukushima Daiichi NPS” -From 3.11 toward the future- (ver, Jan. 2020)07:47

Recent News

3 August, 2020
On Taking Office as JAIF President
3 August, 2020
Nuclear Energy Buyers Guide in Japan 2020-21 is now available
31 July, 2020
Thoughts on the Decision to Approve Changes to the Reprocessing Business
31 July, 2020
NRA Permits JNFL to Alter Rokkasho Reprocessing Plant, Its Having Complied with New Regulatory Standards
30 June, 2020
“Existing NPPs to Enter Age of 80-Year Operations” JAIF Annual Survey Says
16 June, 2020
Toshiba ESS and Yokohama National University Boost Joint Research to Upgrade Heavy-Ion Cancer Therapy, Using Kanagawa Prefectural Facility
8 June, 2020
NRA Grants Permission to Make Changes to Reactor Installation at HTTR under New Regulatory Standards
22 May, 2020
Sendai-2 Starts Periodic Inspection, with Due Date Imminent to Install Specific Safety Facilities
15 May, 2020
NRA Issues Draft Review Report for Rokkasho Reprocessing Plant
30 April, 2020
Construction Begins of Next Generation Synchrotron Radiation Facility at Tohoku University, to Be Used for Fuel Cells and Pharmaceuticals