ML20079H861
| ML20079H861 | |
| Person / Time | |
|---|---|
| Site: | Bellefonte  |
| Issue date: | 01/16/1984 |
| From: | Mills L TENNESSEE VALLEY AUTHORITY |
| To: | James O'Reilly NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II) |
| References | |
| NUDOCS 8401240085 | |
| Download: ML20079H861 (2) | |
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TENNESSEE.; VALLEY A,U,THORITY CH ATTANOOGA TENNESSEE 374ot 400 Chestnut Street Tower II l
BLRD-50-438/82-71 BLRD-50-439/82-65 U.S. Nuclear Regulatory Commission Region II Attn: - Mr. James P. O'Reilly, Regional Administrator 101 Marietta Street, NW, Suite 2900 i
l Atlarta, Georgia 30303
Dear Mr. O'Reilly:
BELLEFONTE NUCLEAR PLANT UNITS 1 AND 2 - UNDERDESIGNED SNUBBER ON MAIN FEEDWATER PIPING IN VALVE ROOM B - BLRD-50-438/82-71, BLRD-50-439/82 L FCURTH INTERIM REPORT I
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. This was followed by our interim reports dated November 10, 1982 and February 16 and May 25, 1983 Enclosed is our fourth L
interim report. We expect to submit our next report by April 19, 1985.
f If you have any questions, please get in touch with R. H. Shell at FTS 858-2688.
Very truly yours, TENNESSEE VALLEY AUTHORITY L. M. Mills, Manager Nuclear Licensing
-Enclosure oc (Enclosure):
Mr. Richard C. DeYoung, Director
-Office of Inspection and Enforcement U.S. Nuclear Regulatory Commission Washington, D.C.
20555 Records Center Institute of Nuclear Power Operations 1100 Circle 75 Parkway, Suite 1500 Atlanta, Georgia 30339 8401240085j4h[PDR 38 PDR ADOCK g gy _,,
B qd27 1983-TVA SOTH ANNIVERSARY l
l An Equal Opportunity Employer a
l ENCLOSURE yw BELLEFONTE NUCLEAR PLANT UNITS 1 AND 2 UNDERDESIGNED SNUBBER ON MAIN FEEDWATER PIPING IN VALVE ROOM B BLRD-50-438/82-71, BLRD-50-439/82-65 NCR BLN CEB 8214 10 CFR 50.55(e)
FOURTH 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 While reviewing the rigorous analysis problems, TVA examined CEB report 75-28, " Dynamic Earthquake Analysis or the Main Steam Valve Room B and Response Spectra for Attached Equipment," which presents the spectra curves
.in 2 components (transl.ational and torsional). It was found that the piping analyses of the attached piping did not consider the torsional components and effects into the floor response spectra. The analysis problems affected are:
N4-1(2) CF-C,
-B, -H N4-1(2) CR-D, -G N4-1(2) SM-R, -S, -C, and -B N4-1 ( 2 ) SV-A,
-I,
-S, -K, -L, M, and -Q TVA has scheduled the reanalysis for the problems affected and will provide more information upon completion of the work.
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