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 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, the direct cause and the root cause of this matter were investigated and recurrence prevention measures were discussed. As a substantial amount of time was required for identifying issues of each operation process, we requested for postponement of the report due date on July 17 (Interim report to be submitted by August 13 and the final report to be submitted by September 28). (Previously announced on July 17, 2012)

We have summarized the issues and organizational factors regarding this matter that were identified through our investigation/analysis of the facts and the root cause, and submitted the interim report to NISA today.

We will continue considering the issues and organizational factors and recurrence prevention measures, in consideration of the issues and organizational factors being analyzed for the "Technical specification noncompliance related to the equipment inspection cycle at Kashiwazaki-Kariwa Nuclear Power Station, Fukushima Daiichi Nuclear Power Station and Fukushima Daini Nuclear Power Station". The summarized results will be submitted to NISA by September 28.

Attachments
1. "Root Cause Analysis Process Chart"(PDF 58.5KB)
2. "Direct Cause, Root Cause Attributed to the Organizational System and Recurrence Prevention Measures of the Technical Specification Noncompliance Due to Inadequate Equipment Maintenance at Kashiwazaki-Kariwa Nuclear Power Station (Interim Report)"(PDF 487KB)

*1 Measurement equipments for which voluntary inspection has not been done at the proper timing At Unit 2-4 at Kashiwazaki-Kariwa Nuclear Power Station Voluntary inspection was not done at the 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.