ML17272A511

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Responds to IE Bulletin 79-04.No Velan Swing Check Valves Used.Nine Testable Check Valves Will Be Provided by Velan to Be Used in Hpcs,Lpcs,Reactor Core Isolation Cooling & RHR Seismic Category 1 Piping Sys
ML17272A511
Person / Time
Site: Columbia, Washington Public Power Supply System, Satsop  Energy Northwest icon.png
Issue date: 05/25/1979
From: Renberger D
WASHINGTON PUBLIC POWER SUPPLY SYSTEM
To: Engelken R
NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION V)
References
NUDOCS 7907090237
Download: ML17272A511 (3)


Text

Wash ton Public Power Supply Sy~m A JOINT OPERATING AGENCY P. O. Box 960 3000 Ggo. W*SHIHctoN IVORY R<ci<c.aNo. vI*sH>NcroN 09352 p>coNa (509) 315 5ooo Docket Nos. 50-397, 50-460, 50-508, 50-509, 50-513 Hr. R. H. Engelken, Director U.S. Nuclear Regulatory Commission Region V Suite 202, Walnut Creek Plaza 1990 N. California Boulevard

-Walnut Creek, CA 94596

Subject:

IE BULLETIN 79-04 VELAN SWING CHECK VALVES

Dear Nr. Engelken:

WPPSS has reviewed the subject IE Bulletin entitled, "Incorrect Heights for Swing Check Valves Manufactured by Velan Engineering Corporation" and submits the following information in response:

WNP-1/4 - Docket Nos. 50-460 and 50-513 A review of contractors supplying valves for HNP-1/4 has been performed and it has been'oncluded that there are no Velan valves being supplied for WNP-1/4.

WNP-.3/5 Docket Nos. 50-508 and 50-.509 A review of contractors supplying valves for WNP-3/5 has been performed and it has been concluded that there are no Velan valves being. supplied for WNP-3/5.

WNP-2' Docket No. 50-397 As requested by the subject IE Bulletin, WHP-2 Seismic Category I piping systems have been reviewed fo determine inch diameter Velan swing check valves are installed or if 3, 4, or 6 scheduled to be installed in these systems. From this review, it has been determined there are no Velan swing check valves used in any of the systems.

g90$ 090 897

Velan, however, has provided nine testable check valves in sizes of 6, 12 and 14 inch diameters which will be used in the HPCS, LPCS, RCIC, and RHR Seismic Category I piping systems. The testable check valves are a type of swing check with an air operator. Design weights for the test-able check valves are more than double the weights of equivalent size swing check valves indicated in the subject bull etin.

lie have been informed by Burns and Roe, that as a result of the subject bulletin, Velan has rechecked the weights of the testable check valves, either by measurements or recal-culations. They have determined none of the valves exceed the weights indicated on the respective valve design drawings.

In the past tJNP-2 has experienced problems with overweight Velan gate valves (62) in sizes ranging from 10 to 24 inch diameters. This problem was not identified to the NRC as a reportable deficiency since a review of the stress analyses for the affected piping systems indicated allowable piping system and hanger stresses would not be exceeded with the overweight valves installed. Some piping hangers, however, were modified to maintain design margins established by Burns and Roe.

If you have an questions, please feel free to contact me.

Very truly yours, DE I;. RENBERGER Assistant Director-Technology DLR:GCS:ct cc: Office of Inspection and Enforcement llashington D.C.

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