ML102310526

8/17/10 Summary of Telephone Conference Call Held Between the NRC and Pacific Gas and Electric Company Concerning D-RAI Related to the Diablo Canyon Nuclear Power Plant, Units 1 and 2, LRA - Metal Fatigue

ML102310526
Person / Time
Site:	Diablo Canyon
Issue date:	08/27/2010
From:	Ferrer N B License Renewal Projects Branch 2
To:
Ferrer, N B, NRR/DLR, 415-1045
References
Download: ML102310526 (5)

Text

UNITED NUCLEAR REGULATORY WASHINGTON, D.C. 20555*0001 August 27,2010 LICENSEE:

Pacific Gas and Electric Company FACILITY:

Diablo Canyon Nuclear Power Plant, Units 1 and 2

SUMMARY

OF TELEPHONE CONFERENCE CALL HELD ON AUGUST 17, 2010, BETWEEN THE U.S. NUCLEAR REGULATORY COMMISSION AND PACIFIC GAS AND ELECTRIC COMPANY CONCERNING DRAFT REQUEST FOR ADDITIONAL INFORMATION RELATED TO THE DIABLO CANYON NUCLEAR POWER PLANT, UNITS 1 AND 2, LICENSE RENEWAL APPLICATION

-METAL FATIGUE The U.S. Nuclear Regulatory Commission (NRC or the staff) and representatives of Pacific Gas and Electric Company (PG&E) held a telephone conference call on August 17, 2010, to obtain clarification on the staff's draft request for additional information (D-RAI) regarding the Diablo Canyon Nuclear Power Plant license renewal application (LRA). Bye-mail dated August 4,2010, the staff sent D-RAls to PG&E regarding metal fatigue time limited aging analysis review. PG&E reviewed the information contained therein, and requested a telephone conference call. The telephone conference call was useful in clarifying the intent of the staff's D-RAls. Enclosure 1 provides a listing of the participants.

Enclosure 2 provides discussions on D-RAls for which the applicant requested clarification.

No changes to other D-RAls were necessary as a result of this telephone conference call. Formal RAls will be issued by a separate letter. The applicant had an opportunity to comment on this summary. Nathaniel Ferrer, Safety 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 DIABLO CANYON NUCLEAR POWER PLANT, UNITS 1 AND PARTICIPANTS Nate Ferrer James Medoff Todd Mintz Philippe Soenen Michelle Albright Kevin Braico Dave Kunsemiller Brett Lynch LICENSE RENEWAL APPLICATION LIST OF AUGUST 17, AFFILIATIONS U.S. Nuclear Regulatory Commission (NRC) !\IRC Center for Nuclear Waste Regulatory Analyses Pacific Gas and Electric Company (PG&E) PG&E PG&E Strategic Teaming And Resource Sharing (STARS) STARS ENCLOSURE Diablo Canyon Nuclear Power Plant, Units 1 and License Renewal Draft Request for Additional Metal D-RAI4.3-8 In the license renewal application (LRA) Table 4.3-1, the applicant credits the monitoring (i.e., cycle count monitoring) of aging management program (AMP) B3.1 as 10 CFR 54.21 (c)(1)(iii) aging management monitoring basis for dispositioning the usage factor (CUF) analyses for the reactor pressure vessel (RPV) Core Support Pressurizer Spray Nozzle, and Pressurizer Heater The LRA Table 4.3-1 or LRA Table 4.3-6 indicated that the RPV Core Support Pressurizer Spray Nozzle, and Pressurizer Heater Penetration in Unit 1 have a limiting design basis CUFs of -0.89, -0.95, and -0.94 respectively and limiting projected CUFs of -1.07, -1.14, and Justify your basis using the "Global" monitoring method of AMP B3.1 to monitor components during the period of extended operation in accordance with 10 CFR 54.21 and why it would not be more appropriate to monitor for these components using the based fatigue (CBF) monitoring Discussion:

Based on discussion with the applicant, the staff determined that the Unit pressurizer heater penetration 60-year projected CUF value was 0.9391, not 2.97, as in LRA Table 4.3-6. The staff will revise the question as follows. The revised question will sent as a formal RAI4.3-8 In the LRA Table 4.3-1, the applicant credits the "Global" monitoring (Le. cycle monitoring) of AMP 83.1 as the 10 CFR 54.21 (c)(1)(iii) aging management basis for dispositioning the CUF analyses for the RPV Core Support Pads, Spray Nozzle, and Pressurizer Heater The LRA Table 4.3-1 or LRA Table 4.3-6 indicated that the RPV Core Support Pressurizer Spray Nozzle, and Pressurizer Heater Penetration in Unit 1 have maximum limiting design basis CUFs of -0.89, -0.95, and -0.94 respectively limiting 60-year projected CUFs of -1.07, -1.14, and Justify your basis for using the "Global" monitoring method of AMP B3.1 to monitor components during the period of extended operation in accordance 10 CFR 54.21 (c)(1)(iii), and why it would not be more appropriate to monitor for components using the CBF monitoring ENCLOSURE 2

August 27.2010 LICENSEE:

Pacific Gas and Electric Company FACILITY:

Diablo Canyon Nuclear Power Plant, Units 1 and 2 SUB..IECT:

SUMMARY

OF TELEPHONE CONFERENCE CALL HELD ON AUGUST 17, 2010, BETWEEN THE U.S. NUCLEAR REGULATORY COMMISSION AND PACIFIC GAS AND ELECTRIC COMPANY CONCERNING DRAFT REQUEST FOR ADDITIONAL INFORMATION RELATED TO THE DIABLO CANYON NUCLEAR POWER PLANT, UNITS 1 AND 2, LICENSE RENEWAL APPLICATION

-METAL FATIGUE The U.S. Nuclear Regulatory Commission (NRC or the staff) and representatives of Pacific Gas and Electric Company (PG&E) held a telephone conference call on August 17, 2010, to obtain clarification on the staff's draft request for additional information (D-RAI) regarding the Diablo Canyon Nuclear Power Plant license renewal application (LRA). Bye-mail dated August 4, 2010. the staff sent D-RAls to PG&E regarding metal fatigue time limited aging analysis review. PG&E reviewed the information contained therein, and requested a telephone conference call. The telephone conference call was useful in clarifying the intent of the staff's D-RAls. Enclosure 1 provides a listing of the participants.

Enclosure 2 provides discussions on D-RAls for which the applicant requested clarification.

No changes to other D-RAls were necessary as a result of this telephone conference call. Formal RAls will be issued by a separate letter. The applicant had an opportunity to comment on this summary. IRA! Nathaniel Ferrer, Safety 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 No.: ML 102310526 OFFICE PM:RPB2:DLR BC:RPB2:DLR PM:RPB2:DLR NAME IKing NFerrer DWrona NFerrer DATE 08/25/10 08/25/10 08/26/10 08/27/10 OFFICIAL RECORD COpy Letter to John Conway from Nathaniel B. Ferrer dated August 27, 2010

SUMMARY

OF TELEPHONE CONFERENCE CALL HELD ON AUGUST 17, 2010, BETWEEN THE U.S. NUCLEAR REGULATORY COMMISSION AND PACIFIC GAS AND ELECTRIC COMPANY CONCERNING DRAFT REQUEST FOR ADDITIONAL INFORMATION RELATED TO THE DIABLO CANYON NUCLEAR POWER PLANT, UNITS 1 AND 2, LICENSE RENEWAL APPLICATION

-METAL FATIGUE DISTRIBUTION:

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