ML20080B248
| ML20080B248 | |
| Person / Time | |
|---|---|
| Site: | Bellefonte  |
| Issue date: | 07/29/1983 |
| From: | Mills L TENNESSEE VALLEY AUTHORITY |
| To: | James O'Reilly NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II) |
| References | |
| REF-PT21-83 10CFR-050.55E, 10CFR-50.55E, NCR-2086, NCR-2087, NCR-2088, NUDOCS 8308050369 | |
| Download: ML20080B248 (2) | |
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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 THIRD 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 NCR's 2086, 2087, and 2088. This was followed by our interim reports dated December 27, 1982 and March 21, 1983 Enclosed is our third interim report. We expect to submit our next report on or about December 5,1983 We consider 10 CFR Part 21 to be applicable to this deficiency.
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, danager 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 8308050369 030729 PDR ADOCK 05000438 S
PDR giciAL COPb 1983-TVA SOrH ANNIVERSARY An Equal Opportunity Employer g
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ENCLOSURE BELLEFONTE NUCLEAR PLANT UNIT 1 RAW COOLING WATER CHILLER UNIT FLOW CONTROL VALVE DEFICIENCIES 10 CFR 50.55(e)
BLRD-50-438/82-80 NCR's 2086, 2087, 2088 THIRD INTERIM REPORT Descriotion of Deficiency Two six-inch freon-activated raw cooling water (RCW) flow control valves (serial Nos. 24867 and 24865) failed to operate upon activation.
This resulted in a high-pressure trip of the HVAC water chillers which are used to remove heat generated by components of the engin'eered safety features (ESP) system.
Investigation revealed that the failures 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 independently 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 manufactured by Metrex Valve Corporation, Glendora, California, and supplied as components on the water chillers fabricated by Dunham-Bush, West Hartford, Connecticut.
Interim Progress TVA.has received and approved a drawing from the vendor accurately depicting the configuration of the valves supplied to BLN.
TVA is still reviewing the root cause and actions required to prevent recurrence (ARPR) relative to the corrosion problem. With regard to the valve stem nut problem, TVA is coordinating the details of the proposed resolution with the valve vendor. TVA will provide a final report upon resolution of these remaining concerns.
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