ML032050428
| ML032050428 | |
| Person / Time | |
|---|---|
| Site: | Palo Verde  |
| Issue date: | 07/16/2003 |
| From: | Mauldin D Arizona Public Service Co |
| To: | Document Control Desk, Office of Nuclear Reactor Regulation |
| References | |
| 102-04967-CDM/SAB/RJR, BL-02-001, TAC MB4563, TAC MB4564, TAC MB4565 | |
| Download: ML032050428 (2) | |
Text
10 CFR 50.54f David Mauldin Vice President Mail Station 7605 Palo Verde Nuclear Nuclear Engineering TEL (623) 393-5553 P.O. Box 52034 Generating Station and Support FAX (623) 393-6077 Phoenix, AZ 85072-2034 102-04967-CDM/SAB/RJR July 16, 2003 U.S. Nuclear Regulatory Commission ATTN: Document Control Desk Mail Station P1-37 11555 Rockville Pike Rockville, MD. 20852
References:
- 1. Letter 102-04885-GRO/SAB/RJR, "APS' Response to NRC Request for Additional Information dated November 21, 2002," dated January 31, 2003 from Gregg R. Overbeck to NRC.
- 2. NRC letter, "Bulletin 2002-01, 'Reactor Pressure Vessel Head Degradation and Reactor Coolant Pressure Boundary Integrity,' 15-Day and 60-Day Response for Palo Verde Nuclear Generating Station, Units 1, 2, and 3 - Request for Additional Information," dated November 21, 2002.
Dear Sirs:
Subject:
Palo Verde Nuclear Generating Station (PVNGS)
Units 1, 2, and 3 Docket Nos. STN 50-528/5291530 Bulletin 2002-01 Additional Information (TAC No.s MB4563, MB4564, and MB4565)
In Reference 1, APS responded to the NRC's request for information transmitted to APS in Reference 2. This letter is being provided to update the information submitted in Reference 1 in which APS provided information on inspections performed in the area of the reactor bottom head nozzles. At the time the information in Reference 1 was provided, APS had only looked at the outer surface of the insulation package on the bottom of the vessel in each unit in accordance with ASME Code and the PVNGS Inservice Inspection (ISI) program.
During the Unit 3 outage completed this spring, APS did access the area between the vessel bottom and the insulation package to support planning and preparation for future examinations of the bottom instrumentation nozzles. During this data gathering inspection, some light staining and boric acid residue was evident on the bottom of the vessel. The probable cause of the staining and residue was from refueling pool seal leaks before the installation of a permanent reactor cavity pool seal during the 4 t A zm"ber of the STARS (trategic Teaning and Resource Sharing) Alliance AD9 Callaway Comanche Peak Diablo Canyon
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U.S. Nuclear Regulatory Commission PVNGS Units 1, 2, and 3, Docket Nos. STN 50-528/529/530 Page 2 refueling outage. APS has determined that the observed staining produced only slight surface oxidation. No measurable degradation was observed. On April 29, 2003, APS discussed this condition with members of the NRC staff as documented in NRC letter dated May 30, 2003.
No commitments are being made to the NRC in this letter. Should you have any questions, please contact Thomas N. Weber at (623) 393-5764.
Sincerely, CDM/SAB/RJR/kg cc:
Regional Administrator, NRC Region IV J. N. Donohew N. L. Salgado