ML20080S566
| ML20080S566 | |
| Person / Time | |
|---|---|
| Site: | Perry  |
| Issue date: | 02/23/1984 |
| From: | Edelman M CLEVELAND ELECTRIC ILLUMINATING CO. |
| To: | James Keppler NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION III) |
| References | |
| RDC-85(83), NUDOCS 8402290166 | |
| Download: ML20080S566 (2) | |
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4 TiiE CLEVEL AN D ELECTRIC ILLU MiM Ai!N G CO M P AM P.o. box 5000 - CLEVELAND. oHlo 44101 - TELEPHONE (216) 622-9800 - lLLUMINATING BLDG. - 55 PUBLICSQUARE Serving The Best Location in the Nation
- I MURRAY R. EDELMAN VICE PREStDENT NUCtIAR Mr. James C. Keppler Regichal Administrator, Region III Office of Inspection and Enforcement U.S. Nuclear Regulatory Commission 799 Roosevelt Road Glen Ellyn, Illinois 60137 RE: Perry Nuclear Power Plant Docket Nos. 50-440; 50-441 Defective Capstan Spring in Mechanical Snubbers Manuf actured by Pacific Scientific Company
[RDC 85(83)]
Dear Mr. Keppler:
This letter serves as the final report pursuant to 10CFR50.55(e) concerning silver plated stainless steel capstan springs used in model PSA 1 and PSA 3 mechanical snubbers manuf actured by Pacific Scientific Company.
Mr. P. R.
Pelke of your of fice was first notified on October 20, 1983, by Mr. E. Riley of The Cleveland Electric Illuminating Company that this problem was being evaluated.
Previously we submitted an interim report on November 17, 1983.
This report contains a Description of the Deficiency, an Analysis of Safety Implication and the Corrective Action Taken.
Description of the Deficiency The Cleveland Electric liluminating Company (CEI) received information from Pullman Power Products (PPP), our supplier of snubbers under our procurement specification SP527, that defect!ve capstan springs were found in certain PSA-1 and PSA-3 mechanical snubbers.
'Je were informed that during testing of the PSA-1 snubbers at Union Electric's Callaway station, several capstan springs had failed due to cracking in the
" tang area".
Correspondence received from PPP stated that initial metallurgical tests indicated spring cracking occurred because of stresses induced during spring forming which caused hydrogen cracking during subsequent silver plating.
Analysis of Safety Implication The snubbers described herein serve to restrain affected piping during seismic events to prevent overstress, while at the same time permitting piping movement due to thermal expansion.
Postulated failure of the capstan spring could result in failure of the snubber to restrain a portion of a piping system during a seismic event.
As a result, subject piping could be overstressed in excess of design allowables.
Please note that there is no evidence to date
[
that any PNPP snubber contains a failed capstan spring.
8402290166 840223 FEB 2 71984 t
PDR ADOCK 05000440 S
PDR g
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' Mr. Janet G. Kcppler-February 23, 1984
- Corrective Action Pacific Scientific Company (PSC), the snubber manuf acturer, has indicated that
.all affected snubbers should be inspected and the capstatt springs replaced.
cIn' order to eliminate any uncertainty as to the integrity of these components,
.CEI directed PPP to. repair or replace all affected snubbers.
Pullman Power Products and its subvendor, Power Piping Company (PPC), have identified a total of 289.PSA-1 and PSA-3 snubbers within the scope of this recall. I.11 affected. snubbers will be returned to PSC for inspection and repair. ~All repaired ' snubbers will also be subjected to operability tests
. prior _'to return.
We anticipate the above described corrective action vill be completed by June 30, 1984.
-Please call if there are any additional questions.
Sincerely,
.'?'T'[
h Murray R. Edelman
.Vice President Nuclear Group HRE:pab-cc:
Mr. M. L. Gildner NRC Site Office Director-
- Office of-Inspection and Enforcement U.S. Nuclear Regulatory Commission Washington, D.C. ~20555
'U.S. Nuclear Regulatory Commission c/o Document Management Branch Washington, D.C.
20555 Records Center, SEE-IN Institute of Nuclear Power Operations 1100 circle 75 Parkway, Suite 1500 Atlanta, Georgia _30339 i.
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