ML20053D948
| ML20053D948 | |
| Person / Time | |
|---|---|
| Site: | Bellefonte  |
| Issue date: | 05/24/1982 |
| 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 8206070467 | |
| Download: ML20053D948 (2) | |
Text
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g TENNESSEE VALLEY AUTHORITY CH ATTANOOGA TENNESSEE 37401 tj$Qg 4.ClTA,nr.yr.
400 Chestnut Street Tower II May 24, 1982 32 g4y g7 g g, g g BLRD-50-438/81-13 BLRD-50-439/81-13 U.S. Nuclear Regulatory Cossaission Region II Attn:
Mr. James P. O'Reilly, Regional Administrator 101 Marietta Street, Suite 3100 Atlanta, Georgia 30303
Dear Mr. O'Reilly:
BELLEFONTE NUCLEAR PLANT UNITS 1 AND 2 - UNACCEPTABLE PIPE BREAK INTERACTIONS - DLRD-50-438/81-13, BLRD-50-439/81 FOURTH INTERIM REPORT The subject deficiency was initially reported to NRC-0IE Inspector R. W. Wrigbt on January 27, 1981, in accordance with 10 CFR 50.55(e) as NCR BLN BLP 8003 This was followed by our interim reports dated February 24, April 27, and December 22, 1981. Enclosed is our fourth interim repert. We expect to submit our next report by August 25, 1982.
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 L. M. Mills, Manager Nuclear Licensing l
Enclosure cc:
Mr. Richard C. DeYoung, Director (Enclosure)
Office of Inspection and Enforcement U.S. Nuclear Regulatory Commission Washington, DC 20555 8206070467 820524 DR ADOCK 05000438 7 27-PDR An Equal Opportunity Employer
ENCLOSURE BELLEFONTE NUCLEAR PLANT UNITS 1 AND 2 UNACCEPTABLE PIPE BREAK INTERACTIONS NCR BLN BLP 8003 BLRD-50-438/81-13, BLRD-50-439/81-13 10 CFR 50.55(e)
FOURTH INTERIM REPORT
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Description of Deficiency Unacceptable pipe break interactions were discovered in the Auxiliary Building electrical equipment trained area (elevations 649.and.669) during postulated pipe break interactions. An inspection at the site confirmed the discovery of the design evaluation. Chilled water, demineralized water, and fire protection piping were not routed in accordance with Design Criteria for Auxiliary Building ESF Zone Environmental Control System, N4-VW-D740, which requires piping to be routed to prevent damage to electrical equipment unless spray shields are provided. This error is attributed to an incorrect assumption that the Class IE electrical equipment cabinets are qualified to withstand a water sray environment (NEMA 4 rating). These equipment cabinets have a NEMA rating of 1 which could allow water to enter and possibly damage the electrical equipment.
Interim Progress TVA has initiated several engineering change notices (ECNs), listed below, to alleviate the potential problem of unceeptable pipe break interactions from chilled water, demineralized water, and fire protection system piping with essential electrical equipment.
Chilled Water Piping An ECN has been issued and design drawings revised to add spray shields and drain pans to piping to prevent spraying of Class IE aquipment. The drain pan design for pipes was tested and found to be acceptable.
Demineralized Water Piping An ECN has been issued and design drawings revised to remove and relocate piping to prevent spraying of Class IE equipment.
Design drawings are being revised to show spray shields at selected locations to prevent spraying of Class IE equipment.
Fire Protection Piping An ECN has been issued and design drawings revised to:
- 1) add deluge valves to standpipes to maintain dry standpipes above elevation 649 and 2) reroute some fire protection piping.
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