ML18017A100
| ML18017A100 | |
| Person / Time | |
|---|---|
| Site: | Susquehanna  |
| Issue date: | 03/31/1980 |
| From: | Curtis N PENNSYLVANIA POWER & LIGHT CO. |
| To: | Grier B NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION I) |
| References | |
| PLA-466, NUDOCS 8004080363 | |
| Download: ML18017A100 (3) | |
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DOC,DATE: 80/03/51 Vi)TAHIZE): Nn Susouenanna Stean Electric Stationi iJnit iE Pennsylva USQuehanna Stoa'iT EleCtriC StatiOnE Unit 2E PennSy)Va AUTHOR AFF ILI A T ION Pennsylvania Power 8, Light Co.
RE C I P I E"'
AFF ILI A t I 0 V Hellion lE Phi)aoeiphiai Office of the Director DOC/ET 'iI n5')00387 05000388
SUBJECT:
Interim neficiency reot re defective cast carbon steel swing check valves mfq by Pacific Valvei Inc.F!nal rept wi)l oe forwar<sed Ejur ina June 1980.
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TITLE: Construction Deficiency Heoort (10CFR'30 5E)
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18101 PHONE: (215) 821-5151 NORhIAN W. CURTIS Vice President Engineenng 8 Construction 821.5381 March 31, 1980 Mr. Boyce H. Grier Director, Region I U. S. Nuclear Regulatory Commission 631 Park Avenue King of Prussia, Pennsylvania 19406 SUSQUEHANNA STEAM ELECTRIC STATION ZNTERZM REPORT OF A DEFICIENCY ON PACIFIC VALVE, INC. CHECK VALVES ERs 100450/100508 FILE 840-4 PLA-466 Dear Mr. Griers This letter serves to confirm information provided by telephone to NRC Inspector Mr. R. Gallo by A. R. Sabol of PPGL on February 22, 1980.
During that conversation, Mr. Gallo was advised that, the subject condition was under evaluation for reportability under the provisions of 10CFR50.55(e).
The deficiency originally involved six each 12-inch cast carbon steel swing check valves with disc/body interferences which prevented closure of the valves and an additional valve cited because it would not close by gravity when installed in a vertical position.
These conditions were originally documented by Bechtel on NCR 3466 and subse-quently resulted in MCAR 1-47 being issued on February 22, 1980.
Zn an interim response to the MCAR, Bechtel Engineering attributes the cause of the defects to casting and/or machining aberrations which combine to create an unfavorable tolerance stackup.
This condition results in interference between disc and internal body contours.
In addition to the valves listed on NCR 3466, other check valves supplied by Pacific Valve have also been identified as suspect and are being handled accordingly.
The corrective action plan for the deficiency, as outlined in the MCAR, includes factory repairs for the defective valves and provisions for factory examination of future production valves.
PENNSYLVANIA POWER 8
LIGHT'OMPANY l$
8805'~SO
Mr. Boyce H. Grier March 31, 1980 Some of these defective check valves are required for the proper function of SSES systems such as RHR and Core Spray pumps.
They are installed in a vertical position in discharge piping.
Failure of any one of these valves could cause pump damage and the loss of the Engineered Safety Feature function for that train. If this deficiency were to have remained uncorrected, it could have affected adversely the safe ope ation of the plant.
Therefore, these deficiencies are deemed reportable under 10CFR50.55(e).
Since the details of this report provide information relevant to the reporting requirements of 10CFR21, this correspondence is considered to also discharge any formal responsibility PP&L may have for reporting in compliance thereto.
We expect to issue a final report on this deficiency by June, 1980.
Very truly yours, N.
W. Curtis Vice President-Engineering
& Construction ARS:mcb cc:
Mr. Victor Stello (15)
Director-Office of Inspection
& Enforcement U. S. Nuclear Regulatory Commission Washington, D.C.
20555 Mr. G. McDonald, Director Office of Management Information
& Program Control U. S. Nuclear Regulatory Commission Washington, D.C.
20555 Mr. Robert M. Gallo U. S. Nuclear Regulatory Commission P.
O. Box 52 Shickshinny, Pennsylvania 18655