ML20030D504
| ML20030D504 | |
| Person / Time | |
|---|---|
| Site: | Bellefonte  |
| Issue date: | 08/25/1981 |
| From: | Mills L TENNESSEE VALLEY AUTHORITY |
| To: | James O'Reilly NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II) |
| References | |
| REF-PT21-80 10CFR-050.55E, 10CFR-50.55E, BLN-MEB-8005, NCR-0020, NCR-20, NUDOCS 8109010463 | |
| Download: ML20030D504 (2) | |
Text
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TENNESSEE VALLEY AUTHORITY cHATdNobG'AT TENNESSEE 37401 400 Chestnut' Street Tower II l
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, f".8" jig 25, 1981 m
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e Mr. James P. O'Reilly, Director M
Office of Inspection and Enforcement c%
U.S. Nuclear Regulatory Commission
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g Region II - Suite 3100 q
101 Marietta Street f
4-Atlanta, Georgia 30303
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Dear Mr. O'Reilly:
g.q 3 BELLEFONTE NUCLEAR PLANT UNITS 1 AND 2 - BORG-WARNER 3" MOTOR OPERATED GATE VALVES - NCR'S 0020 AND BLN MEB 8005 - FOURTH SUPPLEMENTAL REPORT On March 17, 1980, R. W. Wright, NRC-0IE Region II, was informed that NCR 0020 was determined to be reportable in accordance with 10 CFR 50.55(e).
This was followed by our final report dated April 16, 1980. As a result of new information received subsequent to the final report, related NCR BLN MEB 8005 was determined to be reportable in accordance with 10 CFR 50.55(e). This was followed by our supplemental reports dated November 6, 1980, February 13, 1981, and May 7, 1981. Enclosed is our fourth supplemental report. We consider 10 CFR Part 21 to be applicable to this deficiency. We expect to submit our next report by September 24, 1981.
If you have any questions concerning this matter, please get in touch with D. L. Lambert at FTS 857-2581.
Very truly yours, TENNESSEE VALLEY AUTHORITY L. M. Mills, Man ger Nuclear Regulation and Safety Enclosure cc:
Mr. Victor Stello, Jr., Director (Enclosure)
Office of Inspection and Enforcement U.S. Nuclear Regulatory Commission Washington, DC 20555
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PDR ADOCK 05000438 S
- PDR, An Equal Opportunity Employer
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ENCLOSURE BELLEFONTE NUCLEAR PLANT UNITS 1 AND 2 BORG-WARNER 3" MOTOR OPERATED GATE VALVES NCR'S 0020 AND BLN MEB 8005 10 CFR 50.55(e)
FOURTH SUPPLEMENTAL REPORT Description of Deficiency During a test program conducted by Duke Power Company at Marshaltown Steam Station, Borg-Warner's standard 3",
1500-pound motor operated gate valve failed to fully close when actuated pnder opgrating conditions.
The operating conditions were 2485 lb/in at 650 F with a flow rate of 220,000 pounds per hour of steam, which is equivalent to a velocity of approxi-mately 40 feet per second. Under these conditions, the valve closed to within 10 percent of full closure.
Through a number of subsequent tests, the problem was resolved to be a lack of proper guiding, combined with very high bearing stresses between the gates and the seats which caused binding just before full closure.
Similar valves are used at Bellefonte in the Component Cooling Water Ayatem, Reactor Coolant System, Makeup and Purification System, and Decay Heat Removal System.
Interim Progress Borg-Warner has completed testing of the valve for flow interruption and seat leakage. The results of both of these tests have been forwarded to TVA for review.
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