ML20072Q715
| ML20072Q715 | |
| Person / Time | |
|---|---|
| Site: | Bellefonte  |
| Issue date: | 03/21/1983 |
| 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, NUDOCS 8304050294 | |
| Download: ML20072Q715 (2) | |
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TENNESSEE VALLEY AUTHORITY CH ATTANOOGA. TENNESSE?. 37401 400 Chestnut Street Tower II ce, u
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March 21, 1983 5
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BLRD-50-438/82-80
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U.S. Nuclear Regulatory Coinnission
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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 SECOND 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 first interim report dated December 27, 1982. Enclosed is our second interim report. We expect to submit our next report on or about August 1,1983 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 Ds h M L. M. Mills, Manager Nuclear Licensing
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f Enclosure oc:- Mr. Richard C. DeYoung, Director-(Enclosure)
Office of Inspection and Enforcement
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.U.S. Nuclear Regulatory Commission t
Washington, D.C.
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8304050294 830321 DR ADOCK 05000438 PDR..
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- LOFFICIAL COPY l An Equal Opportunity Employer-s,- - 1 jy L
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f ENCLOSURE i
BELLEFONTE NUCLEAR PLANT UNIT 1 RAW COOLING. WATER CHILLER UNIT FLOW CONTROL VALVE DEFICIENCIES-g 10 CFR 50.55(e) j ;
BLRD-50-438/82-80 NCR's 2086, 2087, 2088 SECOND INTERIM REPORT'
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Description of Deficiency i
Two six-inch freon-activated raw cooling water (RCW) flow control i
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 engineered safety features (ESF) system.
Investigation revealed that the failures were 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 I
completely detached. This allowed the valve diaphragm to operate j
independently of the valve stem. These conditions degraded the valves' ability to perform their intended function.
In ;ddition, the internal configuration of the valves supplied do not j
conform to the vendor's drawings. The drawings depict a two-way valve but i
the valves supplied are three-way valves with one lower port blocked to i
make it a two-way valve. In addition, the drawings show a lower diaphraga, diaphragm spacer, and diaphragm plate which are not on the valves supplied.
i The valves in question were manufactured by Metrex Valve Corporation, j
Glendora, California, and supplied as components on the water chillers fabricated by Dunham-Bush, West Hartford, Connecticut.
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Interim Progress The valve manufacturer has been contacted and has recommended that the rust and scale be removed and the valve stem nut replaced and secured with a
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positive locking device. TVA is reviewing the deficiencies to determine the root cause and actions required to prevent' recurrence.. TVA will provide a final report when tha*, determination has.been'made.
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