ML17198A603

Summary of Annual Assessment Meeting Regarding Diablo Canyon Power Plant 2016 Performance

ML17198A603
Person / Time
Site:	Diablo Canyon
Issue date:	07/17/2017
From:	Ryan Alexander, Mark Haire NRC/RGN-IV/DRP/RPB-A
To:	Halpin E Pacific Gas & Electric Co
Haire M
References
Download: ML17198A603 (13)

Text

UNITED STATES NUCLEAR REGULATORY COMMISSION REGION IV 1600 E. LAMAR BLVD.

ARLINGTON, TX 76011-4511 July 17, 2017 Mr. Edward D. Halpin Senior Vice President and Chief Nuclear Officer Pacific Gas and Electric Company Diablo Canyon Power Plant P.O. Box 56, Mail Code 104/6 Avila Beach, CA 93424

SUMMARY

OF ANNUAL ASSESSMENT MEETING REGARDING DIABLO CANYON POWER PLANT 2016 PERFORMANCE

Dear Mr. Halpin:

This refers to the Annual Assessment public meeting conducted at the Courtyard by Marriott, San Luis Obispo, California on the evening of July 12, 2017, between the U.S. Nuclear Regulatory Commission (NRC) and your staff. Approximately 28 members of the public observed and participated in this meeting.

During the meeting, NRC participants discussed our assessment of Pacific Gas and Electrics (PG&Es) performance at Diablo Canyon Power Plant (DCPP) during calendar year 2016. The NRC staff provided an overview of our inspection activities, findings, and overall performance assessment for the station. In particular, we discussed with you our assessment of the White Mitigating Strategies Finding and the NRCs subsequent movement of DCPP Unit 2 to the Regulatory Response Column of oversight which became effective in the 3rd Quarter 2016. The NRC staff also provided an updated status for the public as to NRCs and Diablo Canyons actions to date in response to the Mitigating Strategies and Spent Fuel Instrumentation Orders, and additional post-Fukushima event lessons learned relative to seismic and flooding re-evaluations. A copy of the NRC presentation from the meeting is included as an enclosure to this letter.

After the NRC presented our assessment, your staff briefly discussed PG&Es assessment and corrective actions to date to address the Mitigating Strategies White Finding. Your staff also discussed the actions taken by the station to analyze, inspect, and replace baffle-former bolts associated with the Unit 1 reactor vessel during the most recent refueling outage, in response to operating experience at other stations with similar design and vessel flow characteristics as DCPP Unit 1.

During the public comment/question and answer portion of the meeting, approximately 10 individuals provided their perspectives and asked questions of the NRC staff. While there were a wide range of specific comments and questions posed, several individuals focused on the following topics:

• NRCs oversight of DCPP as the units approach 40 years of operation and possible transition to the decommissioning process;

• The NRCs process for transitioning a station to decommissioning status;

E. Halpin 2

• PG&Es ability to retain talented and qualified staff to operate the units until possibly shutdown at the end of the 40 year licenses (2024 - Unit 1, and 2025 - Unit 2); and

• Concerns about the potential degradation of the reactor vessels due to neutron embrittlement.

In accordance with 10 CFR 2.390 of the NRCs Rules of Practice, a copy of this letter and its enclosures will be available electronically for public inspection in the NRC Public Document Room or from the Publicly Available Records (PARS) component of the NRCs document system (ADAMS). ADAMS is accessible from the NRC Web site at http://www.nrc.gov/reading-rm/adams.html (the Public Electronic Reading Room).

Sincerely,

/RA/

Mark S. Haire, Chief Project Branch A Division of Reactor Projects Docket Nos.: 05000275, 05000323 License Nos: DPR-80, DPR-82

Enclosure:

NRC Presentation cc: Electronic Distribution

Diablo Canyon Annual Assessment Meeting U.S. Nuclear Regulatory Commission July 12, 2017 1

Meeting Purposes

• NRC to discuss 2016 safety performance with PG&E leadership

• NRC to respond to questions from public 2

Enclosure 1

Agenda

• Introductions

• Reactor Oversight Process Overview

• Performance Assessment

• Public Questions 3

NRC Performance Goals

• Safety: Ensure adequate protection of public health and safety and the environment

• Security: Ensure adequate protection for the secure use and management of radioactive materials 4

Enclosure 2

NRC Inspection at Diablo Canyon (2016)

Over 3800 hours0.044 days <br />1.056 hours <br />0.00628 weeks <br />0.00145 months <br /> of on-site inspection

- Routine Resident Inspector inspections

- Unit 2 outage inspections

- Component Design Basis inspection

- Problem Identification & Resolution inspection

- Fire Protection inspection

- Emergency Preparedness Exercise inspection Findings:

- 13 Green

- 1 White 7

White Finding -

Low to Moderate Safety Significance

• White Finding (Low to Moderate Safety Significance)

- Inadequate maintenance instructions

• Column 2 effective 3rd Quarter 2016

• NRC reviewed cause evaluations and corrective actions 8

Enclosure 4

Post-Fukushima Enhancements

• NRC Orders

- Mitigation Strategies

• Beyond design basis external events

• Spent fuel pool level instrumentation

- NRC audit completed (2015)

- Site implementation completed (2016)

- NRC safety evaluation issued (2016)

- Compliance inspection (late 2017) 11 Post-Fukushima Enhancements

• Flooding Reevaluation

- NRC review in progress

• No current safety concerns

- NRC plans completion of the reviews in late 2017

• Seismic Reevaluation

- NRC review in progress

• No current safety concerns

• Additional analysis requested

- Due from PG&E by 4th quarter 2017

- NRC plans completion of review in 2018 12 Enclosure 6

PG&E Comments

• Licensee actions in response to White finding

• Licensee actions related to baffle bolts issue 13 Diablo Canyon Annual Assessment Meeting U.S. Nuclear Regulatory Commission July 12, 2017 14 Enclosure 7

ML17198A603 SUNSI Review ADAMS: Non-Publicly Available Non-Sensitive Keyword:

By: RDA/rdr Yes No Publicly Available Sensitive NRC-002 OFFICE SPE:DRP/A SRI:DCPP OPA:RIV DD:DRP C:DRP/A NAME RAlexander CNewport VDricks RLantz MHaire SIGNATURE /RA/ /RA-E/ /RA/ /RA/ /RA/

DATE 7/14/17 7/17/17 7/17/17 7/17/17 7/17/17