ML17272A511
| ML17272A511 | |
| Person / Time | |
|---|---|
| Site: | Columbia, Washington Public Power Supply System, Satsop  |
| 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 if 3, 4, or 6
inch diameter Velan swing check valves are installed or 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
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 bulletin.
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, DLR:GCS:ct DE I;. RENBERGER Assistant Director-Technology cc:
Office of Inspection and Enforcement llashington D.C.
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