JAPAN ATOMIC INDUSTRIAL FORUM, INC.

for Japanese

ATOMS in JAPAN

6 July, 2018

NRA Draft Report: Tokai-2 NPP Complies with New Regulatory Standards

On July 4, the Nuclear Regulation Authority (NRA) of Japan issued a review report draft finding that the Tokai-2 Nuclear Power Plant (BWR, 1100MWe), owned and operated by the Japan Atomic Power Company (JAPC), complied with the country’s new regulatory standards for nuclear power plants issued after the March 2001 earthquake and tsunami disaster.

Tokai-2 is the third boiling water reactor (BWR) to be granted permission to make changes to its reactor installation (basic design approval), following TEPCO’s Kashiwazaki Kariwa-6 and -7 NPPs in December 2017. The report draft will be officially approved following a period for public comments.

To protect the reactor from tsunamis, JAPC included an embankment seawall when it filed applications for safety examinations in May 2014. For flood protection, though, the design was changed to a “steel pipe-pile reinforced-concrete tide wall” to guard against repeated run-up tides, as well as to improve seismic margins.

Specifically, the design calls for large-caliber, thick-walled steel pipe piles with the strength to withstand earthquakes and tsunamis, supported by the underlying bedrock. The superstructure, meanwhile, is to be covered by reinforced concrete. The examinations confirmed such characteristics as the bearing strength of the facilities and multiple water stop measures.

The NRA had asked JAPC to consider adding “loss of terminal heat sink as a result of tsunami flooding” as an assumed incident, based on the high water levels to be expected from tsunamis striking Japan’s Pacific coast. Both the seawater intake function and all AC power sources will be lost when tsunami-induced flooding causes the loss of the terminal heat sink beyond standard levels. Moreover, drifting debris in the tsunami water might be scattered around the premises.

Having confirmed the effectiveness of JAPC’s measures to prevent reactor core damage through examinations, the NRA will next refer the draft report to the head of the Ministry of Economy, Trade and Industry (METI), also asking him for his opinion on the intention by the Tokyo Electric Power Co. (TEPCO) to provide financial support to JAPC.

The operation of Tokai-2 has been suspended since the giant earthquake and tsunami that struck eastern Japan on March 11, 2011. Before it can restart the reactor, JAPC must first clear an examination for its operating lifetime to be extended, and to obtain approval of the construction work plan (detailed design approval) by November 30, when the plant’s current 40-year lifetime will expire.

In addition, based on agreements, JAPC will have to obtain consent from Ibaraki Prefecture and the 6 cities and villages—including Tokai Village—that host the site.

Comment

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

SNS facebooktwitter

NPPs Map

Video

Fukushima Hydrogen Energy Research Field (FH2R)

9 August, 2018
Fukushima Hydrogen Energy Research Field (FH2R)01:38

Recent News

20 September, 2018
62nd IAEA GC Opens: Japan’s Minister of State for Science Stresses National Policy of Reducing Plutonium Holdings
13 September, 2018
NRA Chairman Rebuts Idea that Hokkaido Blackouts Could Have Been Averted Had Tomari NPPs Been Restarted
12 September, 2018
JAEC Chairman Oka Give High Marks to the IAEA Joint Nuclear Energy Management School
10 September, 2018
NRA Chairman Worried that Tritium Water Storage Would Complicate Fukushima Daiichi Decommissioning
10 September, 2018
Explanatory Meetings and Public Hearings Held on Handling of Tritium Water in Tomioka, Koriyama and Tokyo
30 August, 2018
Preparations Continue to Remove Spent Nuclear Fuel from Unit 3 at Fukushima Daiichi
30 August, 2018
International Mentoring Workshop in Science and Engineering for Women Held in Tokyo
16 August, 2018
Chugoku Electric Applies for Shimane-3 Safety Examination: Second for a Reactor under Construction after Ohma NPP
16 August, 2018
International Forum on Decommissioning Fukushima Daiichi Highlights Remotely-Operated Systems
26 July, 2018
J-Village Stadium to Revert to Original Role as Soccer Training Center, Having Contributed to the Stabilization of Fukushima Daiichi
▲TOP