ML20072C273
| ML20072C273 | |
| Person / Time | |
|---|---|
| Site: | Bellefonte  |
| Issue date: | 06/15/1983 |
| 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, NUDOCS 8306210004 | |
| Download: ML20072C273 (2) | |
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4 NR TENNESSEE VALLEY AUTHORITY sQg g CHATTANOOGA, TENNESSEE 374ol
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gM 400 Chestnut Street Tower II 8 I8 June 15, 1983' p8 38 BLRD-50-438/83-37 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 UNIT 1 - 0FFSET OF DUTCHMAN IN THE INCORE MONITORING SYSTEM - BLRD-50-438/83 FIRST INTERIM REPORT The subject deficiency was initially reported to NRC-0IE Inspector P.'E. T adrickson on May 16, 1983 in accordance with 10 CFR 50.55(e) as NCR 2352. Enclosed is our first interim report. We expect to submit our next report by August 24, 1983 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. Milli, Manager Nuclear Licensing Enclosure cc: Mr. Richard C. DeYoung, Director (Enclosure)
Office of Inspection and Enforcement U.S. Nuclear Regulatory Conunission Washington, D.C.
20555 Records Center (Enclosure)
Institute of Nuclear Power Operations 1100 circle 75 Parkway, Suite 1500 Atlanta, Georgia 30339 RGO6210004 830615 OFFICIALCOP]fl PDR ADDCK 05000438 3
PDR An Equal Opportunity Employer
ENCLOSURE BELLEFONTE NUCLEAR PLANT UNIT 1 0FFSET OF DUTCHMAN IN THE INCORE MONITORING SYSTEM BLRD-50-438/83-37 10 CFR 50.55(e)
NCR BLN EEB 8302 FIRST INTERIM REPORT Description of Deficiency The incore monitoring system (IMS) piping must be installed in precise lengths to assure proper positioning of the incore detector assemblies. The IMS pipe lengths are field adjusted by machining dutchman pipes to fit after the overall pipe lengths are gauged. The dutchmen for 9 of the 62 IMS pipes for unit 1 are offset relative to the longitudinal axig of the pipe runs. For six of the pipes, the offset exceeds the 1 limit in B&W's erection criteria by amounts ranging from 0 -11' to 1 -52'. The cause of these defects is poor workmanship during field installation. There have been no similar deficiencies in the past for Bellefonte and the unit 2 IMS piping has not yet been installed. There are no implications for other TVA plants.
Interim Progress Babcock & Wilcox has been notified and requested to advise TVA of the necessary corrective action. TVA will provide more information upon receipt of this information.
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