ML20028A464
| ML20028A464 | |
| Person / Time | |
|---|---|
| Site: | Bellefonte  |
| Issue date: | 11/10/1982 |
| From: | Mills L TENNESSEE VALLEY AUTHORITY |
| To: | James O'Reilly NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II) |
| References | |
| 10CFR-050.55E, 10CFR-50.55E, NUDOCS 8211220196 | |
| Download: ML20028A464 (2) | |
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TENNESSEE VALLEY AUTHORITY CH ATTANOOG A. TENNESSEE 37401 400 Chestnut Street Tower II a
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- z U.S. Nuclear Regulatory Commission Region II Attn:
Mr. James P. O'Reilly Regional Administrator 101 Marietta Street, Suite 3100 Atlanta, Georgia 30303
Dear Mr. O'Reilly:
BELLEFONTE NUCLEAR PLANTS UNITS 1 AND 2 - UNDERDESIGNED SNUBBER ON MAIN FEEDWATER PIPING IN VALVE ROOM B - BLRD-50-438/82-71, BLRD-50-439/82 FIRST INTERIM REPORT The subject deficiency was initially reported to NRC-0IE Inspector K. Landis on October 13, 1982 in accordance with 10 CFR 50.55(e) as NCR BLN CEB 8214. Enclosed is our first interim report. We expect to submit our next report by February 23, 1983 If you have any questions concerning this matter, please get in touch with R. H. Shell at FTS 858-2688.
Very truly yours, TENNESSEE VALLEY AUTHORITY 73 L. M. Mills, Manager Neclear Licensing Enclosure cc:
Mr. Richard C. DeYoung, Director (Enclosure)
Office of Inspection and Enforcement U.S. Nuclear Regulatory Commission Washington, D.C.
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ENCLOSURE BELLEFONTE NUCLEAR PLANT UNITS 1 AND 2 UNDERDESIGNED SNUBBER ON MAIN FEEDWATER PIPING IN VALVE ROOM B 10 CFR 50.55(e)
NCR BLN CEB 8214 BLRD-50-438/82-71, BLRD-50-439/82-65 FIRST INTERIM REPORT Description of Deficiency A snubber on the main feedwater piping in valve room B, shown on isometric drawing 1 AWO501-CF-B1 at node 5, is underdesigned. The calculated loads (analysis problems N4-1CF-B and N4-2CF-B) at node 5 are low because a snubber was placed on a valve operator at node 25 which apparently added restraint to the piping. The snubber at node 25 if required, should not provide significant restraint to the piping.
Interim Progress The analysis has been completed and is being documented. The results require replacing the underdesigned snubber at node 5 with a rigid support at node 30. The new support configuration and loads will be issued when check procedures are completed. All rigorous analysis problems will be reviewed to identify snubbers placed on valve operators with a restraint component along the axis of the pipe.
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