ML20062D261
| ML20062D261 | |
| Person / Time | |
|---|---|
| Site: | Washington Public Power Supply System |
| Issue date: | 07/16/1982 |
| From: | Mazur D WASHINGTON PUBLIC POWER SUPPLY SYSTEM |
| To: | Faulkenberry R NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION V) |
| References | |
| G1-82-436, GO1-82-0436, GO1-82-436, NUDOCS 8208050527 | |
| Download: ML20062D261 (2) | |
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Docket Nos. 50-460/513 50.55(e) Report IECE gry Washington Public Power Supply System P.O. Box 968 3000 GeorgeWashington Way Richland, Washington 99352 (509)372r5000 July 16, 1982 4 40 l'i S f y G01-82-0436 EQ R. H. Faulkenberry Nuclear Regulatory Commission Region V 1450 Maria Lane, Suite 210 Walnut Creek, California 94596
Subject:
NUCLEAR PROJECT NO. 1 P0TENTIALLY REPORTABLE CONDITION 10CFR50.55(e)
EMERGENCY DIESEL GENERATOR STARTING AIR VALVE ASSEMBLY
Reference:
1)
Telecon CR Edwards, Supply System to PP Narbut; dated 6/18/82.
In reference 1) the Supply System informed your office of a potentially reportable condition under the provisions of 10CFR50.55(e). Attachment A includes a statement of the identified condition and a brief description of our planned action to rectify any problems which may be caused by the reported condition.
As described in the attachment, the Supply System will take the most conservative approach and replace the capscrews.
As a result, the reportability status of this potential defect will remain indeterminate.
Due to the current construction delay on WNP-1, the Supply System will not be able to issue a final report.
In the interim, the Supply System will keep the NRC updated on an annual basis.
If you have any questions or desire further information, please advise.
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D. W. Mazur
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Acting Program Di ector (821)
DWM:LCO:pp Attachment cc: CR Bryant, BPA (399) i JP Laspa, Bechtel (861)
V Mani, UE&C (897)
V Stello, Director of Inspection, NRC FDCC (899)
ORM (847)
A. Toth, NRC ohg6 Jh[O Ph v44
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ATTACHENT A WNP-1/4 DOCKET NOS. 50-460 & 50-513 REPORTABLE CONDITION PER 10CFR50.55(e)
EMERGENCY DIESEL GENERATOR STARTING AIR VALVE ASSEMBLY BACKGROUND The Supply System purchased Emergency Diesel Generators, two per plant, from Transamerica Delaval.
Transamerica Delaval has reported under the requirements of 10CFR Part 21, a deficiency associated with the starting air valve assembly, which is described in detail under " Description of the Deficiency".
The starting air valve assembly was manufactured and installed in the cylinder head by Transamerica Delaval.
Following receipt of the 10CFR Part 21 notification from Transamerica Delaval, Supply System Contract 53, it was determined that this defi-ciency was potentially reportable under the requirements of 10CFR50.55(e).
DESCRIPTION OF THE DEFICIENCY The design deficiency is related to the length of the capscrew which holds the starting air valve assembly in the cylinder head.
If all dimension tolerances are stacked in one direction, the installed clearance is less than desirable.
SAFETY IMPLICATIONS If the capscrew bottoms out in the tapped hole in the cylinder head before the assembly is properly seated, the torque wrench reading would be misleading and the assembly could fail.
CORRECTIVE ACTION Transamerica Delaval has revised the design configuration to specify capscrews 2-3/4" long rather than 3" long. A 3" shorter capscrew still gives adequate thread engagement and eliminates any possibility that the capscrew will bottom out in the tapped hole.
For our Emergency Diesel Generators the 3" capscrews will all be removed and replaced with the 2-3/4" capscrews.
This change will be accomplished at the site through a field change.
Based on the current WNP-1 construction del ay the procurement and installation of the shorter capscrews will not take place until after construction is resumed.
Tracking of the deficiency and correction of the WNP-4 equipment will be assured by generating a nonconformance report against the hardware.