ML20083F578
| ML20083F578 | |
| Person / Time | |
|---|---|
| Site: | Bellefonte  |
| Issue date: | 12/19/1983 |
| 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 8401030182 | |
| Download: ML20083F578 (2) | |
Text
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a0 TENNESSEE VALLEY AUTHORITY CH ATTANOOG A, TENNESSEE 37401 400 Chestnut Street Tower II December 19, 1983 BLRD-50-438/83-61 BLRD-50-439/83-54 U.S. Nuclear Regulatory Commission Region II Attn:
Mr. James P. O'Reilly, Regional Administrator 101 Marietta Street, NW, Suite 2900 Atlanta, Georgia 30303 I
Dear Mr. O'Reilly:
WATTS BAR AND BELLEFONTE NUCLEAR PLANTS UNITS 1 AND 2 OVERTORQUED STUDS ON BORG-WARNER GATE VALVE MOTOR OPERATORS - BLRD-50-435/83-61, BLRD-50-439/83 FIRST INTERIM REPORT The subject deficiency was initially reported to NRC-0IE n.apcotor P. E. Fredrickson on November 21, 1983 in accordance with 10 CPR 50.55(e) as NCR 2390. Enclosed is our first interim report. We expect to submit our next report by March 28, 1984. We consider 10 CFR Part 21 applicable to this deficiency.
If you have any questions, please get in touch with R. H. Shell at FTS 858-2688.
Very truly yours, TENNESSEE VALLEY AUTHORITY L. M. Mills, nager 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)
Instit* te of Nuclear Power Operations 1100 Circle 75 Parkway, Suite 1500 Atlanta, Georgia 30339 8401030182 831219 PDR ADOCK 05000438 g
'Fif;A! (':,v M 27 1983-TVA SOTH ANNIVERSARY l
l An Equal Opportunity Employer
EI: CLOSURE WATTS BAR AND BELLEFONTE NUCLEAR PLANTS UNITS 1 AND 2 OVERTORQUED STUDS ON BORG-WARNER GATE VALVE MOTOR OPERATORS BLRD-50-438/83-61, BLRD-50-439/83-54 NCR 2390 10 CFR 50.55(e)
FIEST INTERIM REPORT Description of Deficiency The operator studs on the 6-inch 150 lb motor-operated gate valves (which isolate the auxiliary feedwater ( AFW) from the emergency raw cooling water (ERCW)) could not be torqued to the 140-160 ft-lbs specified on Borg-Warner Corporation, (Van Nuys, California) drawing No. 79760. When approximately 70 percent of the recommended torque was applied, the maximum allowable yield stress for these studs was exceeded resulting in elongation.
Interim Proeress Borg-Warner has informed TVA that the torque values specified on the drawing are incorrect and will be revised accord *ngly.
Additionally, Borg-Warner is in the process of reviewing all of their drawings to ensure that torque values are correct.
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