ML20038B128
| ML20038B128 | |
| Person / Time | |
|---|---|
| Site: | Washington Public Power Supply System |
| Issue date: | 11/11/1981 |
| From: | Mazur D WASHINGTON PUBLIC POWER SUPPLY SYSTEM |
| To: | Faulkenberry R NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION IV) |
| References | |
| 10CFR-050.55E, 10CFR-50.55E, GO-1-81-374, NUDOCS 8111240753 | |
| Download: ML20038B128 (3) | |
Text
Docket Nos. 50-460/513 50 55(ggjegyyl3 ort fr.0 Washington Public Power Supply System P.O. Box 968 3000 GeorgeWashingtonWay Richland, Washington 993g gg9l3j72g gg Mr. R. H. Faulkenberry, Director Nuclear Regulatory Commission Region V November 11, 19811iE,3;0N y;, ;
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1450 Maria Lane - Suite 210 G0-1-81-374 Walnut Creek, California 94596
Dear Mr. Faulkenberry:
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Subject:
NUCLEAR PROJECTS 1 AND 4 8
POTENTIALLY REPORTABLE CONDITION U8 s 10CFR50.55(e) EMERGENCY DIESEL o, %d ,7go GENERATOR VALVE SPRINGS
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Reference:
- 1) TeleconM.E.Rodin,SupplySystemstoP.Narbh,T Region V Nuclear Regulatory Commission dated October 2, 1981
- 2) DLUE-81-3020, dated August 21, 1981 12.A Pratt to ^
JP Thomas In reference (1) the Supply System informed your office of a potentially reportable condition under 10CFR50.55(e). Reference (2) is Delavals noti-fication to the Suppply System that the operational spares, purchased by the Supply System, may contain the potentially defective valve springs.
Supply System Quality Assurance personnel, in accordance with reference (2) above, have inspected the subject cylinder head assemblies and deter-mined that the Project did, in fact, receive defective valve springs as part of our operational spare parts order. Based on that-determination, we have concluded that the subject cendition is reportable under the re-quirements of 10CFR50.55(e). Attachment "A" describes the significance of the discrepancy and what has been done to correct the discrepant condi-tion. In as much as we have completed what we feel to be the appropriate corrective actions necessary to correct the discrepancy, we are subitting this as a final report on the condition.
If you have any question or desire further information, please advise.
Very truly yours, 1
b D. W. Ma Jr Program Director, WNP-1/4 DWM/MER/im
Attachment:
(Final report on subject condition) cc: HC Grau, UE&C-PA (8-U-6)
V Mani, UE&C/897 V Stello, Director NRC Office of Inspection and Enforcement
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ATTACHMENT A WNP-1/4 DOCKET NOS. 50-460 AND 50-513 REPORTABLE CONDITION PER 10CFR 50.55(e)
EMERGENCY DIESEL GENERATOR VALVE SPRINGS BACKGROUND Transamerican Delaval notified the Supply System on August 14, 1981 that it had filed a 10CFR Part 21 report concerning potentially defective valve springs. The original notification stated that Delaval had not yet deter-mined if any of the defective valve springs had been supplied with the initial delivery of engines and loose spare parts to the Supply System.
A subsequent letter dated August 21, 1981 indicated that the defective valve springs were not supplied as part of the initial purchase order; however, a subsequent purchase of operational spare parts, two cylinder head assemblies with valve springs, could possibly contain the subject defective springs. Delaval reported that the defective springs could be readly identified, in that, they are painted gray with a bro.vn stripe down the side.
An inspection was perforrced by Supply System Project QA personnel. Sur-veillance report number 1-ETAL-06 documents that inspection, which verified that the Supply System did, in fact, receive the defective valve springs.
As a result of Supply System inspections, the defective valve springs (included in the head assembly) have been tagged and placed in a quaran-tine hold area within the Supply System's main warehouse facility. A Supply System NCR, number 99, has been initiated to document the discrepant condition.
Delaval has been further quired regarding what assurance they could provide the Supply System that the generic problem with the valve springs had been corrected. Delaval responded that Melrose Spring Company, Oakland, California, supplier of the potentially defective springs, has been ter-minated as a source of valve springs. It was also reported that the color coding for the replacement springs, not supplied by Melrose, are painted black with a white stripe down the side.
The valve springs which have been determined to be potentially defective were manufactured and supplied to Delaval after May 1980. The Project has been assured by Delaval that the valve springs supplied with the diesel generator units were procured from Melrose prior to the May 1980 cut off date, which was not the case for the operational spares. In order to assure ourselves that the valve springs currently installed in the diesel generator units are not the same as those supplied under the operational spares purchase order, the Test and Start-up procedure for the diesel generators will include an inspection point for the valve springs. This procedure has not been written yet; therefore, the inspection point re-quirement will be entered by way of this report into the Projects Action Tracking System to assure timoly inclusion into the appropriate Test and
" tart-up Procedure.
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DESCRIPTION OF DEFICIENCY -
The emergency diesel generator intake and exhaust valve springs were manu-factured by the Melrose Spring Company, Oakland, California. Some of the springs delivered to Transamerica Delaval by Melrose were not shot-peened properly. The shot-peening is necessary to relieve external stresses incurred in cold-working the spring wire.
SAFETY IMPLICATIONS The lack of shot-peening could lead to fatigue failure, which would then affect engine availability.
CORRECTIVE ACTION The on-hand inventory at Delaval has been purged of the potentially defec-tive springs and measures are being implemented to assure this problem does not re-occur, namely removal to Melrose Spring Company as a supplier of valve springs.
The Supply System, as stated above, has written a nonconformance report (NCR 00099), placed HOLD tags on the affected equipment, and segregated the defective equipment into a hold area. Work is in process to return the potentially defective springs to Deiaval and will replace them with the properly manufactured springs. The final disposition of the NCR will close out the reportable deficiency. As the final disposition of the NCR will assure that all required actions have been completed, this report is considered to be the final report on the subject reportable condition.