ML13213A283

Closure of Part 21 Interim Report for Flowserve Four Inch Regulating Valve

ML13213A283
Person / Time
Site:	Palo Verde
Issue date:	07/26/2013
From:	Cadogan J Arizona Public Service Co
To:	Document Control Desk, Office of Nuclear Reactor Regulation
References
102-06740-JJC/DCE
Download: ML13213A283 (2)

Text

10 CFR 21.21 JOHN J. CADOGAN Vice President Nuclear Engineering Palo Verde Nuclear Generating Station P.O. Box 52034 Phoenix, AZ 85072 Mail Station 7605 Tel 623 393 4921 102-06740-JJC/DCE July 26, 2013 U.S. Nuclear Regulatory Commission ATTN: Document Control Desk 11555 Rockville Pike Rockville, MD 20852

Reference:

Palo Verde Nuclear Generating Station Interim Part 21 Report for Flowserve Four Inch Regulating Valve, Letter 102-06618, dated November 9, 2012, NRC Log Number 2012-51-00

Subject:

Palo Verde Nuclear Generating Station (PVNGS)Units 1, 2, and 3 Docket No. STN 50-528, STN 50-529, and STN 50-530 License No. NPF 41, NPF 51, and NPF 74 Closure of Part 21 Interim Report for Flowserve Four Inch Regulating Valve Pursuant to the requirements of 10 CFR Part 21, APS submitted the Interim Report (Reference) regarding an evaluation of an apparent deviation which could not be completed within 60 days from the discovery.

The apparent deviation of a basic component involved a four inch regulating valve that would not fully close during post installation calibration.

The regulating valve is used to control essential chilled water system chiller refrigerant pressure.APS completed the required evaluation based on inspections by the supplier, Flowserve US, Inc. The evaluation concluded the regulating valve would not fully close during calibration because the valve stem guide had become dislodged from the normal installed position.

This is postulated to have occurred as a result of a fluid pressure surge inside the valve caused by incomplete venting of the valve prior to initiating water flow through the valve during calibration.

Since the inability of the regulating valve to fully close during calibration resulted from maintenance activities during valve installation, no deviation in a A member of the STARS (Strategic Teaming and Resource Sharing) Alliance Callaway.Comanche Peak.Diablo Canyon.Palo Verde-San OnofreSouth Texas-Wolf Creek 102-06740-JJC/DCE July 26, 2013 ATIN: Document Control Desk U. S. Nuclear Regulatory Commission Closure of Interim Part 21 Report for Flowserve Four Inch Regulating Valve Page 2 basic component existed and the condition is no longer subject to an evaluation pursuant to 10 CFR Part 21. Therefore, the referenced interim report may be closed with no additional action required.The 10 CFR 50, Appendix B, supplier and affected components described in the referenced interim report are provided below: Supplier Flowserve US, Inc.1900 S SAUNDERS STREET Raleigh, NC 27603 Basic Components Metrex Corporation Four Inch Refrigerant Pressure Actuated Water Regulating Control Valve, Model MM313OB-11M Flowserve Part Number: 04002262 Metrex Corporation Alternative Bypass Stem Kit for Model MM313OB-11M Metrex Part Numbers 27M-245A, 1K5-14, 45M-744 and 4K1-50 Flowserve Part Number: 04113854XXXXXXX In accordance with 10 CFR 50.4, copies of this report are being forwarded to the Nuclear Regulatory Commission (NRC) Regional Office, NRC Region IV, and the Senior Resident Inspector.

If you have questions regarding this submittal, please contact Mark McGhee, Operations Support Manager, Regulatory Affairs, at (623)393-4972.Arizona Public Service Company makes no commitments in this letter.Sincerely, JJC/DCE/hsc cc: E. E. Collins Jr. NRC Region IV Regional Administrator J. K. Rankin NRC NRR Project Manager for PVNGS J. P. Reynoso NRC Senior Resident Inspector for PVNGS