ML20112F845
| ML20112F845 | |
| Person / Time | |
|---|---|
| Site: | Bellefonte  |
| Issue date: | 01/04/1985 |
| From: | Hufham J TENNESSEE VALLEY AUTHORITY |
| To: | James O'Reilly NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II) |
| References | |
| NCR-3337, NUDOCS 8501160064 | |
| Download: ML20112F845 (3) | |
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o o TENNESSEE VALLEY AUTHORITY CH ATTANOOG A. TENNESSEE 37401 400 Chestnut Street Tower II January 4,1985 BLRD-50-438/84-44 BLRD-50-439/84-40 U.S. Nuclear Regulatory Commission Region II Attn:
Mr. James P. O'Reilly, Regional Administrator 101 Marietta Street, NW, Suite 2900 Atlanta, Georgia 30323
Dear Mr. O'Reilly:
BELi.,EFONTE NUCLEAR PLANT UNITS 1 AND 2 - RIOOROUSLY ANALYZED SUPPORT LOCATIONS NOT VERIFIED - BLRD-50-438/84-44, BLRD-50-439/84 FINAL REPORT The subject deficiency was initially reported to NRC-0IE Inspector P. E. Fredrickson on August 9,1984 in accordance with 10 CFR 50.55(e) as NCR 3337. This was followed by our interim report dated September 11, 1984. Enclosed is our final report.
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
. W.
uh i, Manager
@ Regulations i ensin a
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Enclosure cc:
Mr. Richard C. DeYoung, Director (Enclosure)
Office of Inspection and Enforcement U.S. Nuclear Regulatory Commission Washington, D.C.
20555 I
Records Center (Enclosure)
Institute of Nuclear Power Operations 1100 Circle 75 Parkway, Suite 1500 Atlanta, Georgia 30339 i
0501160064 050104 PDR ADOCK 05000430 PDR g
'OMCIAl. COPY
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An Equal Opportunity Employer
g Ny ENCLOSURE BELLEFONTE NUCLEAR PLANT UNITS 1 AND 2 RIGOROUSLY ANALYZED SUPPORT LOCATIONS NOT VERIFIED BLRD-50-438/84-44, BLRD-50-439/84-40 NCR 3337 10 CFR 50.55(e)
FINAL REPORT Description of Deficiency Nonconformance report (NCR) 2208 (BLRD-50-438/83-18, BLRD-50-439/83-14) idattified inspections of rigorously analyzed pipe supports that were not correctly performed. The support installation locations were not verified against the seismic analysis isometric locations for those cases when the installed location deviated from TVA's Office of Engineering's (OE) detail location. Approximately 3800 completed inspection records were identified on NCR 2208. An additional 752 supports have been idattified that were not investigated on NCR 2208 The apparent cause of the omission of the 752 supports was an incorrect assumption by responsible personnel that all rigorously analyzed supports were uniquely identified in the Pipe Hanger Information System (PHIS) computer program. During input of information into the program, certain supports did not contain data points on the support detail drawings and therefore were not identified in the computer program as rigorously analyzed supports.
Safety Implications If the subject 752 rigorously analyzed supports were not verified as indicated, the unverified supports that were installed outside of the design tolerances could be subject to a reduced margin of safety or failure during a design basis event. This could result in a condition adverse to the safe operation of the plant.
l Corrective Action OE has indicated in the PHIS program those supports that are rigorously analyzed including the supports referenced on NCR 2208. Bellefonte Nuclear Plant (BLN) site personnel have reviewed the program for all (completed-final) inspections of rigorously analyzed supports to ensure that all inspected and approved supports have been idattified. A review of the program identified an additional 196 supports requiring verification and of
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these, 93 were found to be unacceptable with respect to the installed location differing from the analysis location plus applicable tolerances.
Appropriate action (inspection and verification, initiation of field change requests, preparation of support variance sheets, etc.) per site procedures will be taken as required to correct the supports. These actions will be completed by May 15, 1985.
i To prevent recurrence of this deficiency, the following actions have been taken:
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