ML110420183

Summary of Meeting with Representatives of Pacific Gas and Electric Company to Discuss Pre-Application for Seismic License Amendment Request for Diablo Canyon Power Plant, Units 1 and 2

ML110420183
Person / Time
Site:	Diablo Canyon
Issue date:	02/23/2011
From:	Wang A Plant Licensing Branch IV
To:	Office of Nuclear Reactor Regulation
Wang, A B, NRR/DORL/LPLIV, 415-1445
References
TAC ME5033, TAC ME5034
Download: ML110420183 (9)

Text

UNITED STATES NUCLEAR REGULATORY COMMISSION WASHINGTON, D.C. 20555-0001 February 23, 2011 LICENSEE: Pacific Gas and Electric Company FACILITY: Diablo Canyon Power Plant, Units 1 and 2

SUMMARY

OF JANUARY 26,2011, PRE-LICENSING MEETING WITH PACIFIC GAS AND ELECTRIC COMPANY ON RESPONSES TO THE U.S. NUCLEAR REGULATORY COMMISSION STAFF'S QUESTIONS FROM THE PREVIOUS PUBLIC MEETING ON DECEMBER 9, 2010 (TAC NOS.

ME5033 AND ME5034)

On January 26,2010, the U.S. Nuclear Regulatory Commission (NRC) staff, as noticed in letter dated January 13, 2011 (Agencywide Documents Access and Management System (ADAMS)

Accession No. ML110120564), conducted a Category 1 pre-licensing public meeting with representatives of Pacific Gas and Electric Company, licensee for Diablo Canyon Power Plant (DCPP), Units 1 and 2, via an audio teleconference. The purpose of the meeting was to discuss licensee responses to the NRC staff's questions from the previous public meeting on December 9, 2010, as noticed and summarized in the ADAMS Accession Nos. ML103270067 and ML103610074, respectively. This previous meeting discussed the licensee's plans to submit a license amendment request to incorporate management of new geotechnical seismic information into its design and licensing basis at DCPP, Units 1 and 2. A list of attendees is provided in Enclosure 1.

The licensee first answered the agenda items addressing the NRC staff's questions from the December 9, 2010, public meeting. Utilizing the figures in Enclosure 2, the licensee:

• Clarified the differences in terminology and usage between the Long Term Seismic Program (LTSP) evaluation method and the LTSP seismic ground motion spectra;

• Discussed the model change process it intends to apply for its probabilistic seismic hazard analysis;

• Provided quantifications with some basis for its core damage frequency (CDF) and deterministic analysis margins;

• Clarified the specific proposed changes to its facility operating licenses;

• Discussed its proposed license amendment linkage to Generic Issue 199, "Implications of Updated Probabilistic Seismic Hazard Estimates in Central and Eastern United States on Existing Plants;"

-2

• Discussed the method by which the LTSP evaluation method and seismic ground motion spectra will be utilized in future operability determinations and functionality assessments once incorporated into the license; and

• Clarified which aspects of this license amendment submittal and NRC staff review that the licensee may request pilot program credit, if any.

The NRC staff focused numerous questions on the licensee's flowchart from Enclosure 2 titled "DCPP LTSP Update - Evaluation of Updated Ground Motion," draft dated January 25, 2011, which will be the cornerstone of the new methodology the licensee desires to include in its licensing basis in its Updated Final Safety Analysis Report (UFSAR). The staff questioned which technical standards the licensee was utilizing as the basis for the analysis process and the basis for the CDF and deterministic margin values included in the flowchart (that were not provided during the meeting on December 9,2010). The licensee reviewed hypothetical scenarios of different magnitude, new seismic information, and how the ground motion information would be evaluated per the flowchart. The NRC staff questioned the LTSP methodology's relationship to the current design and licensing basis, the method by which the licensee intends to peer review its probabilistic seismic hazard model, how its proposed license amendment will address future advances in seismic technology, and how it plans to include the NRC technical review during hazard model step changes. The staff also questioned when the provisions of Title 10 of the Code of Federal Regulations (10 CFR) , Section 50.59, "Changes, tests, and experiments," will be triggered in the LTSP flowchart process, and if this licensing action would incorporate a "seismic" program in Technical Specifications (TS), Section 5, "Administrative Controls." Lastly, the NRC staff inquired on the licensee's current submittal schedule for its proposed license amendment.

In response to the questions, the licensee reviewed an initial list of technical standards documents it utilized in the LTSP methodology development and agreed to provide the complete list to the NRC staff following the meeting. The licensee discussed the general basis for the CDF and margin values with the NRC staff noting that the safety evaluation for a potential license amendment will emphasize the review of those values. The licensee stated that all new seismic information will be evaluated both deterministically and probabilistically (both sides of the flowchart), and that while the LTSP provides bounding for the current design and licensing basis, the existing ground motion spectra within its license will remain its licensing basis. The licensee stated that it plans to provide detail in its license amendment submittal to address probabilistic hazard model peer review, future advances in seismic technology, a method for NRC review during hazard model step changes, specificity to include 10 CFR 50.59 procedural guidance, and potential inclusion of this program within TS. Lastly, the licensee agreed that additional discussions would be needed before the license amendment could be submitted.

Eleven members of the public were in attendance. Public Meeting Feedback forms were not received.

-3 Please direct any inquiries to Jim Polickoski at 301-415-5430 or james.polickoski@nrc.gov.

Ok \0CG\M~' ,'

Alan B. Wang, Proj¢ct Manager Plant Licensing Bran IV Division of Operating Reactor Licensing Office of Nuclear Reactor Regulation Docket Nos. 50-275 and 50-323

Enclosures:

1. List of Attendees

2. Licensee Provided Background Information cc w/encls: Distribution via Listserv

LIST OF ATTENDEES JANUARY 26, 2011, MEETING WITH PACIFIC GAS AND ELECTRIC COMPANY U.S. NUCLEAR REGULATORY COMMISSION DOCKET NOS. 50-275 AND 50-323 NRC

Participants:

Headquarters:

Michael Markley, Chief, Plant licensing Branch IV, NRRIDORL Kamal Manoly, Senior Level Advisor for Structural Mechanics, NRR/DE*

Annie Kammerer, Senior Seismologist/Geophysicist, Structural, Geotechnical & Seismic Engineering Branch, RESIDE Maxwell Smith, Attorney, Office of General Counsel Alan Wang, Project Manager, Plant Licensing Branch IV, NRR/DORL James Polickoski, Project Manager, Plant Licensing Branch IV, NRR/DORL Region IV:

Don Allen, Chief, Reactor Projects Branch B

• Michael Peck, Senior Resident Inspector, Diablo Canyon Power Plant

• Christie Denissen, Reactor Inspector, Engineering Branch 1

• Jonathan Braisted, Project Engineer, Reactor Projects Branch C

• Pacific Gas and Electric Company

Participants:

Loren Sharp, Senior Director, Technical Services

• Ken Peters, Senior Director, Engineering Services

• Norman Abrahamson, Principal Consulting Technology Seismologist, Geosciences

• Rich Klimczak, Manager, Design Engineering

• Nathan Barber, Engineer, Probabilistic Risk Assessment

• Bill Hourstman, Consulting Engineer, Civil Engineering

• Philippe Soenen, Licensing Supervisor, Regulatory Services

• Jennifer Post, Attorney, Environmental Compliance and Nuclear

• Members of the Public:

Diane Curran, Mothers for Peace Rochelle Becker, Executive Director, Alliance for Nuclear Responsibility

• Mark Johnsson, California Coastal Commission

• Greg Hardy, Senior Principal, Simpson, Gumpertz, and Heger

• Jason Kolons, Nuclear Engineer, Southern California Edison

• Caroline McAndrews, Southern California Edison

• David Van Horsen, Southern California Edison

• Joe Wambold, consultant to Southern California Edison

• Loyd Wright, Southern California Edison

• Walker Matthews, Southern California Edison

• Linda Conklin, Southern California Edison

• Enclosure 1 denotes partiCipating via teleconference

ENCLOSURE 2 LICENSEE PROVIDED BACKGROUND INFORMATION

~~ DCPP LTSP Update L!:11

~ Eil Evaluation of Updated Ground Motion r.; ~ DRAFT (01 2011 )

Updated Ground Motion Information Developed by PG&E Geosciences Department Seismic Seismic Probabilistic Risk Seismic Hazard Margins Assessment Curve Assessment (Confirmatory Path, when (Primaryl Data Available) Immediate Path)

Is Is Deterministic Seismic Hazard Curve Spectrum Enveloped by Lic.

Enveloped by Lic. Basis Basis LTSP Spectrum LTSP Curve

?

Reassess Plant Seismic Rerun Seismic PRA with Updated Margins for Impacted Seismic Hazard Curve (Data Flow Only} *** .... . ....... ..

SSC(s) with Updated Response Spectrum Is 11 SCDF Is

< 1.0 E-5/yr Min. Seismic And SCDF Margin ~ 1.14

< 1.0E-04/yr  ?

?

Document Updated

Response

Spectrum"",

Seismic Margin ,

etc. in DCPP Records Perform Risk Assessment and Implement Compensatory Measures Enter Tech Spec.

(if required) Action Statement (SSC is Inoperable)

Take Actions to Document Updated Increase Min .

Seismic Hazard Curve", Seismic Margin SCDF, etc. in DCPP (Modifications)

Records Submit Updated LTSP PRA and Seismic Margins Information to USNRC with Periodic UFSAR Revision

• License Basis LTSP Seismic Hazard Curve is replaced with Updated Curve

• • License Basis LTSP Response Spectrum is replaced with Updated Spectrum

Determ inistic Com parison J

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3 Please direct any inquiries to Jim Polickoski at 301-415-5430 or james.polickoski@nrc.gov.

IRN Alan B. Wang, Project Manager Plant Licensing Branch IV Division of Operating Reactor Licensing Office of Nuclear Reactor Regulation Docket Nos. 50-275 and 50-323

Enclosures:

1. List of Attendees

2. Licensee Provided Background Information cc w/encls: Distribution via Listserv DISTRIBUTION:

PUBLIC KManoly, NRR/DE LPLIV r/f AKammerer, RESIDE/SGSEB RidsAcrsAcnw_MailCTR Resource CSteger, NRR RidsNroDser Resource JWeil,OCA RidsNrrDe Resource MSmith, OGC/GCHENAGCOR RidsNrrDlrRpb2 Resource SUUal, OGC/GCHENAGCOR RidsNrrDorl Resource AVegeL RIV RidsNrrDorlLpl4 Resource RDeese, RIV RidsNrrLAJBurkhardt Resource MPeck, RIV RidsNrrPMDiabloCanyon Resource MWiliiams, RIV RidsResDe Resource CDenissen, RIV RidsOcaMailCenter Resource JTrapp, EDO RIV RidsOgcRp Resource VDricks, OPA RIV RidsOpaMail Resource J. Polickoski, NRR RidsRgn4MailCenter Resource ADAMS Accession No. Meetin Notice ML110120564 Meetin ML110420183 DORULPL4/PM DORLlLPL4/PM DORLlLPL4/LA DORLlLPL4/BC DORLlLPL4/PM NAME JPolickoski AWang JBurkhardt MMarkley AWang