ML20086P279
| ML20086P279 | |
| Person / Time | |
|---|---|
| Site: | Bellefonte  |
| Issue date: | 02/16/1984 |
| From: | Mills L TENNESSEE VALLEY AUTHORITY |
| To: | James O'Reilly NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II) |
| References | |
| NUDOCS 8402270087 | |
| Download: ML20086P279 (2) | |
Text
y TENNESSEE VALLEY AUTHORITY CHATTANOOGk. TENNESSEE 37401 400 Chestnut Street Tower II 22 A 9. 2 0,1984 February 16 6 -
BLRD-50-438/84-09 BLRD-50-439/84-08 U.S. Nuclear Regulatory Commission Region II Attn:
Mr. James P. O'Reilly, Regional Administrator 101 Marietta Street, NW, Suite 2900 Atlanta, Georgia 30303
Dear Mr. O'Reilly:
BELLEFONTE NUCLEAR PLANT UNITS 1 AND 2 - INSULATION WEIGHTS ASSUMED IN ANALYSES FOR VALVES AND PIPE FITTINGS - BLRD-50-438/84-09, BLRD-50-439/84 FIRST INTERIM REPORT The subject deficiency was initially reported to NRC-0IE Inspector P. E. Fredrickson on January 23, 1984 in accordance with 10 CFR 50.55(e) as NCR BLN CEB 8401. Enclosed is our first interim report. We expect to submit our next report by May 15, 1985.
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 cc:
Mr. Richard C. DeYoung, Director (Enclosure)
Office of Inspection and Enforcement U.S. Nuclear Regulatory Commission Washington, D.C.
20555 Records Center (Enclosure)
Institute of Nuclear Power Operations 1100 Circle 75 Parkway, Suite 1500 Atlanta, Georgia 30339 I
B402270087 840216 PDR ADOCK 05000438 gp}UOAAI. COI."t' S
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o ENCLOSURE BELLEFONTE NUCLEAR PLANT UNITS 1 AND 2 INSULATION WEIGHTS ASSUMED IN ANALYSES FOR VALVES AND PIPE FITTINGS j
BLRD-50-438/84-09, BLRD-50-439/84-08 NCR BLN CEB 8401 j
FIRST INTERIM REPORT l
l l
f Description of Deficiency TVA's Civil Engineering Support Branch (CEB) Engineering Procedure (EP) 21.12, revision 2, Table 5.4-5, and Bellefonte Design Project drawing 3BT0001-00-01 list valve and pipe fitting adjustment factors for insulation weight calculations. The factors multiplied by the weight per foot of pipe The I
insulation yield an insulation weight value per valve or fitting.
analysts have used these factors and applied the results as a weight per foot in the analyses. This has created some nonconservative results.
Interim Progress TVA will perform a study utilizing computer-aided analysis on selected mathematical models to review the effects of this deficiency on the frequency analyses, supports loads, and pipe / component / fitting stresses.
The results of this study will determine what further corrective action will be necessary.
TVA will also revise the Bellefonte analyses verification checklist to include a requirement to check the application of the insulation weight l
The Bellefonte Rigorous Analysis Handbook (RAH) will adjustment factor (s).
be revised to provide additional instructions to ensure that the analyst is aware of the results obtained by applying these factors.
1 TVA is investigating the applicability of this deficiency to other TVA nuclear plants and to analysis work done by contract organizations outside TVA.
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