ML20198D350
| ML20198D350 | |
| Person / Time | |
|---|---|
| Site: | Bellefonte  |
| Issue date: | 10/21/1985 |
| From: | Hufham J TENNESSEE VALLEY AUTHORITY |
| To: | Grace J NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II) |
| References | |
| NUDOCS 8511120317 | |
| Download: ML20198D350 (2) | |
Text
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l TENNESSEE VALLEY AUTHORITY j
CH ATTANOOGA, TENNESSEE 37401 400 Chestnut Street Tower II October 21, 1985 BLRD-50-438/84-54 g.
BLRD-50-439/84-50 U.S. Nuclear Regulatory Commission Region II Attn:
Dr. J. Nelson Grace, Regional Administrator 101 Marietta Street, NW, Suite 2900 Atlanta, Georgia 30323
Dear Dr. Grace:
BELLEFONTE NUCLEAR PLANT UNITS 1 AND 2 - WIND AND TORNADO LOADING NOT CONSIDERED IN PIPING ANALYSIS - BLRD-50-438/84-54 AND BLRD-50-439/84-50 SECOND INTERIM REPORT The subject deficiency was initially reported to NRC-OIE Inspector P. E. Fredrickson on October 25, 1984 in accordance with 10 CFR 50.55(e) as NCR BLN CEB 8415. This was followed by our first interim report dated November 28, 1984. Enclosed is our second interim report. We expect to submit our next report no later than six months before fuel loading of unit 1.
If you have any questions, please get in touch with R. H. Shell at FTS 858-2688.
Very truly yours, TENNESSEE VALLEY AUTHORITY r
o J. W. Hufham, Mana S
Licensing and Risk Protection
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c.n Enclosure
'cc:
Mr. James Taylor, Director.(Enclosure)
D Office of Inspection and Enforcement U.S. Nuclear Regulatory Consission Washington, D.C.
20555 co Records Center (Enclosure)
Institute of Nuclear Power Operations 1100 Circle 75 Parkway, Suite 1500 Atlanta, Georgia 30339 8511120317 851021 ADOCK 0%4 8 y
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An Equal Opportunity Employer g g
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ENCLOSURE BELLEFONTE NUCLEAR PLANT UNITS 1 AND 2 WIND AND TORNADO LOADING NOT CONSIDERED IN PIPING ANALYSIS BLRD-50-438/84-54, BLRD-50-439/84-50 NRC BLNCEB8415 10 CFR 50.55(e)
SECOND INTERIN REPORT Description of Deficiency During the reanalysis of rigorous piping analysis problem N4-OSA-B for Bellefonte Nuclear Plant (BLN), a deficiency was identified in which extreme wind forces were not considered in the previous analysis. The inclusion of wind loads into a rigorous piping analysis problem is required by BLE design criteria N4-50-D711 and by the BLN rigorous analysis handbook (RAH). Analysis problem N4-OSA-B was used to determine the locations of and loads on seismic category I and I(L) supports for the 12-inch auxiliary steam system (SA) piping on the roof of the BLN Auxiliary Building.
The apparent cause of this deficiency was the omission of wind force effect consideration by the analyst and checker and the unanticipated need to specifically address wind load effect in the verification checklist.
Interim Promress All analysis problems having exposed piping at Bellefonte Nuclear Plant have been reviewed, and those with deficiencies have-been identified.
Those problems are:
N4-OSA-B, N4-OSA-C, N4-1CF-H, N4-100-E, N4-2CF-P, N4-2CF-C, N4-2CF-H, N4-2CR-D, and N4-200-E.
The reanalysis of unit 1 problems has been completed. The reanalysis of unit 2 problems and the redesign of pipe supports to accommodate increased loads for unit 1 and unit 2 have been scheduled.
The. extent of pipe support redesign and rework j
will be submitted with the final report on this condition.
i-In order to prevent recurrence of this deficiency, Bellefonte rigorous piping analysis verification checklist, BLN-RAH-401 was reissued on May 9, 1985, and included the requirement to consider wind and tornado forces on exposed piping.
TVA will submit a final report on this item upon completion but no later than six months before fuel loading of unit 1.
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