ML20076F350
| ML20076F350 | |
| Person / Time | |
|---|---|
| Site: | Bellefonte  |
| Issue date: | 08/18/1983 |
| 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-2352, NUDOCS 8308260020 | |
| Download: ML20076F350 (2) | |
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TENNESS$ h,4ki EY JHORITY i,,,.
Att CH ATTANOOGA. TENNESSEE 37401 400 Chestnut Street Tower II 83 AUG 23 A 9 :t up,1983 i
Augus DLRD-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 SECOND INTERIM REPORT The subject deficiency was initially reported to NRC-0IE Inspector P. E. Fredrickson on May 16, 1983 in accordance with 10 CFR 50.55(e) as NCR 2352. This was followed by our first interim report dated June 15,
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1983 Enclosed is our second interim report. We expect to submit our next report by October 26, 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. Mills, Manager Nuclear Licensing g
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 8308260020 830818 gDRADOCK05000 opyq q jy p m.
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1983-TVA SOTH ANNIVERSARY An Equal Opportunity Employer
ENCLOSURE BELLEFONTE NUCLEAR PLANT UNIT 1 0FFSET OF DUTCHMAN IN THE INCORE MONITORING SYSTEM BLRD-Sa-438/83-37 10 CFR 50.55(e)
NCR 2352 SECOND 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.
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Interim Progress All of the piping in question passed a 0.502-inch diameter gauge test.
Based on this information, B&W has advised TVA that the inside diameters of the pipes should be acceptable "as is," providing the insertion force, as tested with a dummy detector, does not exceed 25 pounds. TVA is presently evaluating B&W's response to determine if the acceptablity of the pipes can be accomplished more readily by other means rather than the insertion force testing.
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