ML110120418

Summary of Telephone Conference Call Held with NRC and PG&E Concerning Requests for Additional Information Response Related to the Diablo Canyon Nuclear Power Plant, Units 1 and 2, LRA (TAC Nos. ME2896 & ME2897)

ML110120418
Person / Time
Site:	Diablo Canyon
Issue date:	02/07/2011
From:	Ferrer N License Renewal Projects Branch 2
To:
FERRER, NATHANIEL, NRR/DLR/RPB2 415-1045
References
TAC ME2896, TAC ME2897
Download: ML110120418 (6)

Text

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February 7, 2011

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LICENSEE:

Pacific Gas and Electric Company FACILITY:

Diablo Canyon Nuclear Power Plant, Units 1 and 2

SUMMARY

OF TELEPHONE CONFERENCE CALL HELD ON DECEMBER 14, 2010, BETWEEN THE U.S. NUCLEAR REGULATORY COMMISSION AND PACIFIC GAS AND ELECTRIC COMPANY CONCERNING REQUESTS FOR ADDITIONAL INFORMATION RESPONSE RELATED TO THE DIABLO CANYON NUCLEAR POWER PLANT. UNITS 1 AND 2, LICENSE RENEWAL APPLICATION (TAC NUMBERS ME2896 AND ME2897)

The U.S. Nuclear Regulatory Commission (NRC or the staff) and representatives of Pacific Gas and Electric Company (PG&E or the applicant) held a telephone conference call on December 14, 2010, to obtain clarification on PG&E's responses to the staff's requests for additional information (RAI) regarding the Diablo Canyon Nuclear Power Plant license renewal application.

By letters dated October 12, 15,27, November 3, and 8, 2010, PG&E sent the staff its responses to RAls regarding scoping and screening and TLAAs The staff reviewed the information contained therein, and requested a telephone conference call The telephone conference call was useful in clarifying PG&E's response. Enclosure 1 provides a listing of the participants. Enclosure 2 provides discussions on the RAI response for which the staff requested clarification.

The applicant had an opportunity to comment on this summary.

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Nathaniel B. Ferrer, Project Manager Projects Branch 2 Division of License Renewal Office of Nuclear Reactor Regulation Docket Nos. 50-275 and 50-323

Enclosures:

As stated cc w/encls: Distribution via Listserv

TELEPHONE CONFERENCE CALL DIABLO CANYON NUCLEAR POWER PLANT, UNITS 1 AND 2 LICENSE RENEWAL APPLICATION LIST OF PARTICIPANTS DECEMBER 14, 2010 PARTICIPANTS:

Nate Ferrer Bill Rogers Stan Gardocki Garry Armstrong John Tsao Carol Nove Terry Grebel Dan Gibbons Brandy Sizemore Kevin Braico Chris Beard David Gonzalez Miranda Tan Sid Bowern Greg Porter Larry Price Phillipe Soenen David Kunsemiller Stan Shepard AI Saunders Rye Davis AFFILIATIONS:

U.S. Nuclear Regulatory Commission (NRC)

NRC NRC NRC NRC NRC Pacific Gas and Electric Company (PG&E)

PG&E PG&E PG&E PG&E PG&E PG&E PG&E PG&E PG&E PG&E Strategic Teaming And Resource Sharing (STARS)

STARS STARS STARS ENCLOSURE 1

Diablo Canyon Nuclear Power Plant. Units 1 and 2 License Renewal Application Request for Additional Information Scoping/Screening and TLAA RAI2.1-1 In its supplemental response to request for additional information (RAI) 2.1-1, the applicant provided its Title 10 of the Code of Federal Regulations (10 CFR) 54.4(a)(2) evaluation for nonsafety-related, fluid-filled components in the vicinity of safety-related components in the turbine building.

Discussion:

The staff was not clear on whether nonsafety-related, fluid-filled components could affect the HVAC supply and exhaust ducts in the 480V switchgear rooms. The staff was also not sure whether nonsafety-related, fluid-filled components could affect the CRPS supply fans, controls, and instrumentation. The applicant agreed to supplement its response to RAI 2.1-1 to address the staff's concerns.

RAt 2.3-1 In its supplemental response to RAI 2.3-1, the applicant provided justification for not including non safety-related piping directly attached to safety-related solenoid-operated valves in the compressed air system. The applicant referenced Nuclear Energy Institute (NEI) 95-10, Appendix F, Section 5.2.3.1, as part of its justification.

Discussion:

The staff noted that NEI95-10, Appendix F, Section 5 applies to nonsafety-related structures and components (SCs) that are not directly attached to safety-related SCs; therefore, the staff was not clear why this section of NEI 95-10 applies to the nonsafety-related piping. The applicant agreed to supplement its response to RAI 2.3-1 to address the staff's concerns.

RAt 2.3-3 In its supplemental response to RAI 2.3-1, the applicant provided justification for not including nonsafety-related, fluid-filled components located in the fuel oil transfer pump vaults.

Discussion:

The staff could not determine, based on the applicant's justification, why the nonsafety-related, fluid-filled components would not affect the safety-related components located in the vaults.

The applicant agreed to supplement its response to RAI 2.3-1 to address the staffs concerns.

ENCLOSURE 2

- 2 RAI 2.3.3.7-1 In its supplemental response to RAI 2.3.3.7-1, the applicant provided justification for not including water traps in the compressed air system within the scope of license renewal.

Discussion:

The staff was not clear on whether a complete failure of the water traps could affect safety-related components that are located in the vicinity of the traps. The applicant agreed to supplement its response to RAI 2.3.3.7-1 to address the staff's concerns.

RAI 2.3.3.14-1 In its supplemental response to RAI 2.3.3.14-1, the applicant provided justification for why the diesel air start unloader line was in scope for 10 CFR 54.4(a)(2).

Discussion:

The staff was not clear why the unloader line was not considered as part of the pressure boundary and relied upon to perform a safety-related function. The applicant agreed to supplement its response to RAI 2.3.3.14-1 to address the staff's concerns.

RAI4.7.5-2 In its supplemental response to RAI4.7.5-2, the applicant provided details of the flaw evaluation for RHR piping well WIC-95.

Discussion:

The staff noted that based on the indication from the flaw evaluation, the flaw should be considered surface connected per the American Society of Mechanical Engineers Boiler and Pressure Vessel Code,Section XI IWA-3310. The staff also noted that the applicant did not consider the flaw surface connected in its evaluation. The applicant agreed to supplement its response to RAI 4.7.5-2 to address the staff's concern.

February 7, 2011 LICENSEE:

Pacific Gas and Electric Company FACILITY:

Diablo Canyon Nuclear Power Plant, Units 1 and 2

SUMMARY

OF TELEPHONE CONFERENCE CALL HELD ON DECEMBER 14, 2010, BETWEEN THE U.S. NUCLEAR REGULATORY COMMISSION AND PACIFIC GAS AND ELECTRIC COMPANY CONCERNING REQUESTS FOR ADDITIONAL INFORMATION RESPONSE RELATED TO THE DIABLO CANYON NUCLEAR POWER PLANT, UNITS 1 AND 2, LICENSE RENEWAL APPLICATION (TAC NUMBERS ME2896 AND ME2897)

The U.S. Nuclear Regulatory Commission (NRC or the staff) and representatives of Pacific Gas and Electric Company (PG&E or the applicant) held a telephone conference call on December 14,2010, to obtain clarification on PG&E's responses to the staff's requests for additional information (RAI) regarding the Diablo Canyon Nuclear Power Plant license renewal application.

By letters dated October 12, 15,27, November 3, and 8, 2010, PG&E sent the staff its responses to RAls regarding scoping and screening and TLAAs. The staff reviewed the information contained therein, and requested a telephone conference call. The telephone conference call was useful in clarifying PG&E's response. Enclosure 1 provides a listing of the participants. Enclosure 2 provides discussions on the RAI response for which the staff requested clarification.

The applicant had an opportunity to comment on this summary.

IRA!

Nathaniel B. Ferrer, Project Manager Projects Branch 2 Division of License Renewal Office of Nuclear Reactor Regulation Docket Nos. 50-275 and 50-323

Enclosures:

As stated cc w/encls: Distribution via Listserv DISTRIBUTION:

See next page ADAMS Accession Number: ML110120418 OFFICE LA: DLR PM: DLR/RPB2 BC: DLR/RPB2 PM: DLR/RPB2 NAME YEdmonds NFerrer DWrona NFerrer DATE 01/21/2011 01/26/2011 01/31/2011 02/07/2011 OFFICIAL RECORD COPY

Letter to Pacific Gas and Electric Company from Nathaniel B. Ferrer dated February 7, 2011

SUMMARY

OF TELEPHONE CONFERENCE CALL HELD ON DECEMBER 14, 2010, BETWEEN THE U.S. NUCLEAR REGULATORY COMMISSION AND PACIFIC GAS AND ELECTRIC COMPANY CONCERNING REQUESTS FOR ADDITIONAL INFORMATION RESPONSE RELATED TO THE DIABLO CANYON NUCLEAR POWER PLANT, UNITS 1 AND 2, LICENSE RENEWAL APPLICATION (TAC NUMBERS ME2896 AND ME2897)

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