Regarding the measurement equipments for which voluntary inspection has not been done at the proper timing^*1 installed in Unit 2-4 at Kashiwazaki-Kariwa Nuclear Station that is under long-term suspension, we received a directive document on the inadequate maintenance of measurement control equipments from the Nuclear and Industrial Safety Agency (NISA) of the Ministry of Economy, Trade and Industry on March 9, 2012. In response to the direction given, we submitted report (1) on March 16 (partially revised on March 30), and report (2) on April 13 to NISA.

In accordance with the directive document^*2 regarding technical specification noncompliance received from NISA on May 23, we submitted a report including our plan to identify issues, investigate the direct cause and the root cause of this matter and discuss recurrence prevention measures to NISA. (Previously announced on August 13, 2012)

We have extracted the direct cause and organizational factors related to this matter and discussed recurrence prevention measures based on the issues and organizational factors identified in the "Technical Specification Noncompliance Due to the Inadequate Equipment Maintenance at Kashiwazaki-Kariwa Nuclear Power Station, Fukushima Daiichi Nuclear Power Station and Fukushima Daini Nuclear Power Station".

A report addressing the root cause and recurrence prevention measures has been submitted to the Nuclear Regulatory Authority today. We will make efforts in implementing the recurrence prevention measures developed in order to improve operation quality.

Attachment
"Report on the Direct Cause, Root Cause Attributed to the Organizational System and Recurrence Prevention Measures of the Technical Specification Noncompliance Due to the Inadequate Equipment Maintenance at Kashiwazaki-Kariwa Nuclear Power Station (Outline)" (PDF 115KB)

Reference
"Report on the Direct Cause, Root Cause Attributed to the Organizational System and Recurrence Prevention Measures of the Technical Specification Noncompliance Due to the Inadequate Equipment Maintenance at Kashiwazaki-Kariwa Nuclear Power Station" (PDF 682KB)

*1 Measurement equipments for which voluntary inspection has not been done at proper timing
At Unit 2-4 at Kashiwazaki-Kariwa Nuclear Power Station, voluntary inspection was found to have not been done at proper timing for the total of 3,529 measurement equipments (704 main measurement equipments and 2,825 other measurement equipments)

*2 Directive document
"Technical Specification Noncompliance Due to the Inadequate Equipment Maintenance at TEPCO Kashiwazaki-Kariwa Nuclear Power Station (Direction)" (May 21, 2012 NISA No.1)

The aforementioned documents are available only in Japanese. We apologize for the inconvenience this may cause.