DCL-05-098, Response to Request for Additional Information Regarding License Amendment Request 05-03, Request for Amendment to Recapture Low-Power Testing Time.

Response to Request for Additional Information Regarding License Amendment Request 05-03, Request for Amendment to Recapture Low-Power Testing Time.

ML061040224
Person / Time
Site:	Diablo Canyon
Issue date:	04/06/2006
From:	Jacobs D Pacific Gas & Electric Co
To:	Document Control Desk, Office of Nuclear Reactor Regulation
References
DCL-05-098, DCL-06-045, LAR 05-03
Download: ML061040224 (6)

Text

Pacific Gas and El.-ctric Companye Donna Jacobs Diablo Canton Power Plant Vice President P.0. Box 5"3 Nuclear Services Avila Beacdt, CA 93424 805.545.4300 April 6, 2006 Fax: 805.5*5.4234 PG&E Letter DCL-06-045 U.S. Nuclear Regulatory Commission ATTN: Document Control Desk Washington, D.C. 20555-0001 Docket No. 50-275, OL-DPR-80 Docket No. 50-323, OL-DPR-82 Diablo Canyon Units 1 and 2 Response to Request for Additional Information Regarding License Amendment Request 05-03, "Request for Amendment to Recapture Low-Power Testing Time."

Dear Commissioners and Staff:

Pacific Gas and Electric Company Letter DCL-05-098, dated August 23, 2005, submitted License Amendment Request (LAR) 05-03, "Request for Amendment to Recapture Low-Power Testing Time Revision," to revise the expiration dates of the Units 1 and 2 facility-operating licenses to recapture low-power testing time.

Specifically, the expiration date of each unit's full-power operating license (FPOL) would be revised to reflect a 40-year term measured from the date of issuance o: the FPOL, as permitted by 10 CFR 50.51.

On January 27, 2006, the NRC staff requested additional information required to complete the review of LAR 05-03. During a March 29, 2006, telephone conference, the staff provided clarification to its request for additional information. Enclosure 1 provides additional information required by the NRC staff to complete its review of LAR 05-03. Enclosure 2 provides the fluences at the clad base metal interface.

If you have any questions or require additional information, please contact Mr. Terence Grebel at (805) 545-4160.

Sincerely, Don J A member of the STARS (Strategic Teaming and Resource Sharing) Alliance CzAtaway

• Comanche Peak

• Diablo Canyon

• Palo Verde

• South Texas Project

• Wolf Creek

Document Control Desk PG&E Letter DCL-06-045 April 6, 2006 Page 2 gwh/41 62 Enclosures cc: Edgar Bailey, DHS Terry W. Jackson Bruce S. Mallett Diablo Distribution ccI'enc: Alan B. Wang A member of the STARS (Strategic Teaming and Resource Sharing) Alliance Callaway

• Comanche Peak

• DiabloCanyon

• PaloVerde

• SouthTexas Project

• Wolf Creek

PG&E Letter DCL-06-045 UNITED STATES OF AMERICA NUCLEAR REGULATORY COMMISSION Docket No. 50-275 In the Matter of ) Facility Operating License PACIF:IC GAS AND ELECTRIC COMPANY) No. DPR-80

)

Diablo Canyon Power Plant ) Docket No. 50-323 Units I and2 ) Facility Operating License

) No. DPR-82 AFFIDAVIT Donna Jacobs, being of lawful age, first being duly sworn upon oath states that she is Vice President - Nuclear Services of Pacific Gas and Electric Company; that she has executed this response to the NRC request for additional information regarding License Amendment Request 05-03 on behalf of said company with full power and authority to do so; that she is familiar with the content thereof; and that the facts stated therein are true and correct to the best of her knowledge, information, and belief.

Donna 4acobs Vice Pre dent - Nuclear Services Subscribed and sworn to before me this 6th day of April, 2006, by Donna Jacobs, personally known to me or proved to me on the basis of satisfactory evidence to be ihe person who appeared before me.

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Enclosure I PG&E Letter DCL-06-045 Response to Request for Additional Information Regarding License Amendment Request 05-03, "Request for Amendment to Recapture Low-Power Testing Time" NRC Question The license amendment request proposes to add approximately 37 months of full power operation for the DCPP-1 reactor and approximately 4 months of full power operation for the DCPP-2 reactor. The additional time at full power operations will expose the RV beltline materials for the DCPP-1/2 RVs to additional neutron radiation (i.e., increasing the neutron fluence - in units of n/cm2, E > 1.0 MeV). Therefore, to support anticipated approval of the license amendment, the NRC staff requests that PGE provide the "Low-power Test Recovery-impacted" PTS and USE calculations for the DCPP-1/2 RV beltline materials, as assessed through to the revised "Low-Power Test Recovery" expiration dates for the units.

During a telephone conference call on March 29, 2006, the staff requested that PG&E provid9 the fluences at the clad base metal interface.

PG&E Response to NRC Question For the proposed Unit 1 end of operating license (EOL) at approximately 35.2 effective full-power years (EFPY) on November 2, 2024, the limiting RTpTs values calculated and their respective 10 CFR 50.61 screening limits are:

RTpTs(weld 3-442C) = 258.70 F, which is < 2700 F plate or axial weld limit RTpTs(weld 9-442) = 198.70 F, which is < 3000F circumferential weld limit For the proposed Unit 2 EOL at approximately 35.8 EFPY on August 26, 2025, the limiting RTPTS values calculated and their respective 10 CFR 50.61 screening limits are:

RTpTs(plate B5454-2) = 214.8 0F, which is < 2700 F plate or axial weld limit RTPTS(weld 9-201) = 20.5 0F, which is < 3000 F circumferential weld limit Appendix G of 10 CFR 50 requires that the upper shelf energy (USE) remain > 50 ft-lbs throughout the life of the vessel at T/4. For Unit 1, the limiting (minimum) T/4 USE at EVOL is 61.1 ft-lbs. This is predicted to occur for axial weld 3-442C.

Similarly, for Unit 2, the limiting (minimum) T/4 USE at EOL is 57.7 ft-lbs. This is predicted to occur for axial weld 3-201 B. contains the fluences at the clad base metal interface for Units 1 and 2.

Enclosure 2 PG&E Letter DCL-06-045 Page 1 of 2 Fluences at the Clad Base Metal Interface for Units 1 and 2 The following information was derived from Pacific Gas and Electric Company Calculation N-297, Revision 0, which estimates the pressurized thermal shock reference temperature and upper shelf energy for all reactor vessel beltline materials at the projecaed end of operating license for both Diablo Canyon units.

DCPP I Fluences On November 2, 2024 Material Fast Fluences (n/cm 2 )

Intermed. Shell Plates B4106-1 1.43E+19 B4106-2 1.43E+19 B4106-3 1.43E+19 Lower Shell Plates B4107-1 1.43E+19 B4107-2 1.43E+19 B4107-3 1.43E+19 Intermed. Shell Long.

Welds 2-442 A,B 1.10E+19 2-442 C 5.46E+18 Intermed. Shell to Lower Shell Weld 9-442 1.43E+19 Lower Shell Long.

Welds 3-442 A,B 9.08E+18 3-442 C 1.43E+19

Enclosure 2 PG&E Letter DCL-06-045 Page 2 of 2 DCPP 2 Fluences On August 26, 2025 Material Fast Fluence (n/cm 2)

Intermed. Shell Plate B5454-1 1.68E+19 B5454-2 1.68E+19 B5454-3 1.68E+19 Lower Shell Plate B5455-1 1.68E+19 B5455-2 1.68E+19 B5455-3 1.68E+19 Intermed. Shell Long.

Welds 2-201 A 9.15E+18 2-201 B 8.64E+18 2-201 C 7.25E+18 Intermed. Shell to Lower Shell Weld 9-201 1.68E+19 Lower Shell Long.

Welds 3-201 A 7.25E+18 3-201 B 9.15E+18 3-201 C 8.64E+18