ML20082T875
| ML20082T875 | |
| Person / Time | |
|---|---|
| Site: | Bellefonte  |
| Issue date: | 12/06/1983 |
| 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, NCR-2208, NUDOCS 8312160160 | |
| Download: ML20082T875 (2) | |
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TENN,ESSEE VALLEY AUTHORITY CHATTANOOG A..TgNfJESSEE 374ol 400 Chestnut Street Tower II 0 0,' 12 A 9,' De6 ember 6,1983
.97 BLRD-50-438/83-18 BLRD-50-439/83-14 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 - SEISMIC PIPE SUPPORT INSPECTION DEFICIENCIES - BLRD-50-438/83-18, BLRD-50-439/83 FINAL REPORT The subject deficiency was initially reported to NRC-0IE Inspector Linda Watson on January 31, 1983 in accordance with 10 CFR 50.55(e) as NCR 2208. This was followed by our interim reports dated February 28, 1983 and June 20, 1983 Enclosed is our final report.
If you have any questions, please get in touch with R. 3. Shell at FTS 858-2688.
Very truly yours, TENNESSEE VALLEY AUTHORITY L. M. Mille, Manager Nuclear Licensing Enclosure oc:
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 8312160160 831206 QI pCLY-(. Opy PDR ADOCK 05000438 S
PDR sb0
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1983-TVA 5OTH ANNIVERS ARY g
An Equal Opportunity Employer
O ENCLOSURE BELLEFONTE NUCLEAR PLANT UNITS 1 AND 2 SEISMIC PIPE SUPPORT INSPECTION DEFICIENCIES NCR 2208 10 CFR 50.55(e)
BLRD-50-438/83-18, BLRD-50-439/83-14 FINAL REP 0hT Description of Deficiency Inspections of rigorously analyzed pipe supports 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 Division of Engineering Design's design detail locations. The apparent cause of this deficiency was a misunderstanding of paragraph 7.1.b of BNP-QCP 6.17, which requires the verification of the location deviation.
Safety Implications The installed location of certain pipe supports may be further away from the presumed analysis location than the EN DES relocation tolerance allows. These mislocated supports could possibly invalidate the seismic analysis of safety-related systems, to a degree proportional to the number of supports located outside of the design allowables. This situation could produce a condition adverse to the safety of operation of the plant.
Corrective Action Approximately 3800 completed inspection records for rigorously analyzed supports have been identified. These records were reviewed to ensure that the location recorded on the inspection record is within the location specified by the governing analysis document plus any applicable tolerance. The review of these records' has tvsulted in 290 Quality Control Investigation heports (QCIRs) documenting deviations from specified support locations. Approximately 227 of these have been closed and the balance will be closed by October 17, 1984. At this time, all corrective actions will be completed.
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BNP-QCP-6.17 has been revised specifying that the support location shall be as shown on the support detail drawings, and any deviation /use of tolerance must be verified against the support load table or isometric. All responsible inspection personnel have been instructed that location tolerances may be applied to the analysis location but not necessarily to the detail drawing location.
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