ML20087M563
| ML20087M563 | |
| Person / Time | |
|---|---|
| Site: | Bellefonte  |
| Issue date: | 03/22/1984 |
| From: | Mills L TENNESSEE VALLEY AUTHORITY |
| To: | James O'Reilly NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II) |
| References | |
| REF-PT21-84 NUDOCS 8403300054 | |
| Download: ML20087M563 (2) | |
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.j TENNESSEE VALLEY AUTHORITY CHATTANOOG A. TENNESSEE 37401 400 Chestnut Street Tower II ON NA0 2b N! W 0 '
BLRD-50-438/82-80 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 - RAW COOLING WATER CHILLER UNIT FLOW CONTROL VALVE DEFICIENCIES - BLRD-50-438/82 FIFTH INTERIM REPORT The subject deficiency was initially reported to NRC-0IE Inspector G. A. Belisle on November 26, 1982 in accordance with 10 CFR 50.55(e) as NCRs 2086, 2087, and 2088. This was followed by our interim reports dated December 27, 1982 and March 21, July 27 and December 1,1983 Enclosed is our fifth interim report. We expect to submit our next report on & about April 21, 1985. We consider 10 CFR Part 21 to be applicable to this deficiency.
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y A one week delay of this submittal was discussed with Inspector P. E. Fredrickson on March 14, 1984.
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 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 8403300054 840322 gDRADOCK 05000438 OFFICIAL COPY PDR 9 27 1983-TVA SOTH ANNIVERSARY l
An Equal Opportunity Employer
ENCLOSURE BEILEFONTE NUCLEAR PLANT UNIT 1 RAW COOLING WATER CHILLER UNIT FLOW CONTROL VALVE DEFICIENCIES 10 CFR 50.55(e)
BLRD-50-43 8/ 82-80 NCRs 2086, 2087, 2088 FIFTH INTERIM REPORT Description of Deficiency Two six-inch freon-activated raw cooling water (RCW) flow control l
valves (serial Nos. 24867 and 24865) failed to operate upon activation.
1his resulted in a high pressure trip of the HVAC water chillers which are used to remove heat generated by components of the engineered safety feat;nres (ESF) system.
Investigation revealed that the f ailures occurred because of two separate conditions. One valve (serial No. 24867) failed because of a buildup of rust and scale on the valve's pilot seat contact surfaces. This inhibited the movement of the valve stem.
On both valves, the valve stem nut was completely detached. This allowed the valve diaphragm to operate ladependently of the valve stem. These conditions degraded the valves' ability to perform their intended function.
In addition, the internal configuration of the valves supplied do not conform to the vendor's drawings. The drawings depict a two-way valve but the valves supplied are three-way valves with one lower port blocked to make it a two-way valve.
In addition, the drawings show a lower diaphragm, diaphragm spacer, and diaphragm plate which are not on the valves supplied.
The valves in question were manuf actured by Metrez Valve Corporation, Glendora, California, and supplied as components on the water chillers fabrica ted by Dunham-Bush, West Hartford,. Connecticut.
Interim Proaress TVA is continuing the investigation of the deficiency and generic lapilcations. TVA will submit a final report upon conclusion of our investigation and determination of corrective action.
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