ML082050497

Closure of Confirmatory Action Letter NRR - 07-003

ML082050497
Person / Time
Site:	Diablo Canyon
Issue date:	08/15/2008
From:	Giitter J NRC/NRR/ADRO/DORL/LPLIV
To:	Becker J Pacific Gas & Electric Co
Giitter J G/DORL, 415-1453
References
TAC MD7290
Download: ML082050497 (4)

Text

August 15, 2008 Mr. James R. Becker Site Vice President and Station Director Diablo Canyon Power Plant Mail Code 104/5/502 P.O. Box 56 Avila Beach, CA 93424

SUBJECT:

DIABLO CANYON POWER PLANT, UNIT 2 - CLOSURE OF CONFIRMATORY ACTION LETTER NRR-07-003 (TAC NO. MD7290)

Dear Mr. Becker:

On March 15, 2007 the U.S. Nuclear Regulatory Commission (NRC) issued Confirmatory Action Letter (CAL) No. NRR-07-003 (Agencywide Documents Access and Management System (ADAMS) Accession No. ML070670425) regarding dissimilar metal welds near the pressurizer at Diablo Canyon Power Plant (DCPP) Unit 2. This letter acknowledges receipt of your letter dated April 24, 2008 (ADAMS Accession No. ML081230617), informing the NRC of actions taken in response to this CAL.

In your letter, you stated that during the fourteenth refueling outage for DCPP Unit 2, Pacific Gas

& Electric Company completed preemptive full structural weld overlays to mitigate the effects of primary water stress corrosion cracking of susceptible material on the DCPP Unit 2 pressurizer dissimilar metal welds. Further, you stated that examination results on the DCPP Unit 2 pressurizer spray, relief, safety, and surge nozzle safe-ends indicated successful weld overlay mitigation with no reportable indications for each weld overlay.

Based on your letter, the NRC has found that all the commitments listed in the CAL and supporting commitment letter dated February 20, 2007 (ADAMS Accession No. ML070580128),

have been met. No further response is required regarding the CAL. We consider the CAL closed. As such, it is no longer necessary to implement enhanced inspection and leakage monitoring requirements for the reactor coolant system. This action closes TAC No. MD7290.

Thank you for informing us of the actions documented in your letter. These actions may be examined during a future NRC inspection of your facility.

Current NRC guidance regarding CALs is contained in the NRC Enforcement Policy and the NRC Enforcement Manual, which are available at the NRC web site at http://www.nrc.gov/about-nrc/regulatory/enforcement.html (click on Enforcement Policy or Enforcement Guidance) or by contacting the Government Printing Office (GPO) toll-free at 1-888-293-6498. The GPO is open from 7:00 a.m. to 9:00 p.m. EST, Monday through Friday (except Federal holidays).

J. Becker In accordance with 10 CFR 2.390 of the NRCs Rules of Practice, a copy of this letter will be made available electronically for public inspection in the NRC Public Document Room or from the NRC=s document system (ADAMS), accessible from the NRC Web site at http://www.nrc.gov/reading-rm.html.

Sincerely,

/RA/

Joseph G. Giitter, Director Division of Operating Reactor Licensing Office of Nuclear Reactor Regulation Docket No.: 50-323 cc: See next page

ML082050497 OFFICE DCI/CPNB DCI/CPNB LPL4/PM LPL4/LA LPL4/BC(A)

NAME JCollins TChan AWang JDonohew GLappert JDonohew for 8/7/08 8/7/08 8/12/08 7/31/08 8/12/08 DATE OFFICE DCI/D DRP/D RIV DORL/D NAME MEvans DChamberlain AVegel for JGiitter 8/13/08 8/15/08 DATE 8/7/08 Diablo Canyon Power Plant, Units 1 and 2 cc:

NRC Resident Inspector City Editor Diablo Canyon Power Plant The Tribune c/o U.S. Nuclear Regulatory Commission 3825 South Higuera Street P.O. Box 369 P.O. Box 112 Avila Beach, CA 93424 San Luis, Obispo, CA 94306-0112 Sierra Club San Lucia Chapter Director, Radiologic Health Branch ATTN: Andrew Christie State Department of Health Services P.O. Box 15755 P.O. Box 997414, MS 7610 San Luis Obispo, CA 93406 Sacramento, CA 95899-7414 Ms. Nancy Culver Mr. James Boyd, Commissioner San Luis Obispo California Energy Commission Mothers for Peace 1516 Ninth Street MS (31)

P.O. Box 164 Sacramento, CA 95831 Pismo Beach, CA 93448 Mr. James R. Becker Chairman Site Vice President San Luis Obispo County Diablo Canyon Power Plant Board of Supervisors P.O. Box 56 1055 Monterey Street, Suite D430 Avila Beach, CA 93424 San Luis Obispo, CA 93408 Jennifer Tang Mr. Truman Burns Field Representative Mr. Robert Kinosian United States Senator Barbara Boxer California Public Utilities Commission 1700 Montgomery Street, Suite 240 505 Van Ness, Room 4102 San Francisco, CA 94111 San Francisco, CA 94102 Diablo Canyon Independent Safety Committee Attn: Robert R. Wellington, Esq.

Legal Counsel 857 Cass Street, Suite D Monterey, CA 93940 Regional Administrator, Region IV U.S. Nuclear Regulatory Commission 612 E.Lamar Blvd., Suite 400 Arlington, TX 76011-4125 Jennifer Post, Esq.

Pacific Gas & Electric Company P.O. Box 7442 San Francisco, CA 94120