ML15275A094

Summary of the Severe Accident Mitigation Alternatives Site Audit Related to the Diablo Canyon Power Plant, Units 1 and 2 License Renewal Review

ML15275A094
Person / Time
Site:	Diablo Canyon
Issue date:	10/07/2015
From:	Michael Wentzel License Renewal Projects Branch 2
To:	Halpin E Pacific Gas & Electric Co
Wentzel M, NRR/DLR,415-6459
References
DLR-15-0458, TAC MF4019, TAC MF4020, FOIA/PA-2016-0438
Download: ML15275A094 (5)

Text

UNITED STATES NUCLEAR REGULATORY COMMISSION WASHINGTON, D.C. 20555-0001 October 7, 2015 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 THE SEVERE ACCIDENTS MITIGATION ALTERNATIVES SITE AUDIT RELATED TO THE ENVIRONMENTAL REVIEW OF THE DIABLO CANYON POWER PLANT, UNITS 1 AND 2, LICENSE RENEWAL APPLICATION (TAC NOS. MF4019 AND MF4020)

Dear Mr. Halpin:

On September 21-23, 2015, a review team consisting of staff from the U.S. Nuclear Regulatory Commission (NRC) and contractors from the Pacific Northwest National Laboratory participated in a site audit in San Luis Obispo, California, related to the severe accidents mitigation alternatives (SAMA) environmental review of the Diablo Canyon Power Plant (DCPP), Units 1 and 2, license renewal application. The primary goal of the site visit was to review documentation and gather information to ensure that the environmental requirements for license renewal, as codified in Title 10 of the Code of Federal Regulations Part 51 were met, in accordance with the issued audit plan (ML15233A518). The enclosure is a list of representatives from NRC and personnel from Pacific Gas and Electric (PG&E) and its contractors who participated in the site audit.

The audit began on September 21, 2015, with an entrance meeting to introduce participants and discuss logistics of the audit. Following the entrance meeting, the NRC environmental review team and PG&E discussed the following topics relative to the SAMA analysis: (1) Level 1 Probabilistic Risk Assessment (PRA), (2) Level 2 model PRA, (3) external events, (4) Level 3 consequence analysis, (5) SAMA identification and screening, (6) cost-benefit analysis, and (7) consideration of potentially lower cost alternative SAMAs.

During the exit meeting at the conclusion of the site audit, the NRC environmental review team summarized the status of the review with PG&E. Most of the team's questions identified in the audit plan or during the audit were answered through the conduct of the audit.

E. Halpin NRC staff is preparing requests for additional information (RAIs), which will be issued in a subsequent letter. While the NRC review team did not identify any significant environmental issues during its site audit, the environmental review of the DCPP license renewal application is ongoing, and thus, any additional information necessary to support the review would be formally requested via the RAI process.

Sincerely,

/RA/

Michael J. Wentzel, Project Manager Projects Branch 2 Division of License Renewal Office of Nuclear Reactor Regulation Docket Nos. 50-275 and 50-323

Enclosure:

As stated cc w/encl: Listserv

ML15275A094 *concurrence via email OFFICE LA:DLR* PM:RPB2:DLR BC:RPB2:DLR PM:RPB2:DLR NAME IBetts MWentzel JDanna MWentzel DATE 10/ 5 /15 10/ 6 /15 10/ 7 /15 10/ 7 /15

Letter from M. Wentzel to E. Halpin dated October 7, 2015

SUMMARY

OF THE SEVERE ACCIDENTS MITIGATION ALTERNATIVES SITE AUDIT RELATED TO THE ENVIRONMENTAL REVIEW OF THE DIABLO CANYON POWER PLANT, UNITS 1 AND 2, LICENSE RENEWAL APPLICATION (TAC NOS. MF4019 AND MF4020)

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PUBLIC RidsNrrDlr Resource RidsNrrDlrRpb1 Resource RidsNrrDlrRpb2 Resource RidsNrrDlrRerb Resource RidsNrrDlrRarb Resource RidsNrrDlrRasb Resource RidsNrrDlrRsrg Resource RidsOgcMailCenter Resource RidsNrrPMDiabloCanyon Resource

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MWentzel JDanna RPlasse YDiaz-Sanabria SLingam CKanatas, OGC JLindell, OGC THipschman, SRI JReynoso, RI GMiller, RIV DMcIntyre, OPA LUselding, OPA WMaier, RIV AMoreno, OCA

LIST OF PARTICIPANTS DIABLO CANYON POWER PLANT, UNITS 1 AND 2 LICENSE RENEWAL APPLICATION ENVIRONMENTAL REVIEW SEVERE ACCIDENTS MITIGATION ALTERNATIVES SITE AUDIT September 21-23, 2015 PARTICIPANTS ORGANIZATION Jerry Dozier U.S. Nuclear Regulatory Commission (NRC)

Michael Wentzel NRC Bruce Schmitt Pacific Northwest National Laboratory (PNNL)

Bob Schmidt PNNL Nathan Barker Pacific Gas and Electric (PG&E)

Al Bates PG&E Terry Grebel PG&E Tom Jones PG&E Dave Miklash PG&E Michelle Olsofsky PG&E John Pyo PG&E Jearl Strickland PG&E David Bidwell ERIN Engineering and Research, Inc. (ERIN)

Alex Duvall ERIN Donald MacLeod ERIN ENCLOSURE