ML20033B976
| ML20033B976 | |
| Person / Time | |
|---|---|
| Site: | Bellefonte  |
| Issue date: | 11/20/1981 |
| From: | Mills L TENNESSEE VALLEY AUTHORITY |
| To: | James O'Reilly NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II) |
| References | |
| REF-PT21-81 10CFR-050.55E, 10CFR-50.55E, NUDOCS 8112020538 | |
| Download: ML20033B976 (2) | |
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TENNESSEE VALLEY AUTHORITY (f
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I November 20, 1981 N
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BLPD-50-439/81-67 Mr. James P. O' Reil.ly, Director Office of Inspection and Enforcement U.S. Nuclear Regulatory Commission Region II - Suite 3100 101 dacietta Street Atlanta, Georgia 30303 4
Dear Mr. O'Reilly:
a BELLEFONTE NUCLEAR PLANT UNITS 1 AND 2 - OVERTORQUEING OF BOLTS ON FLOW CONTROL VALVE - BLRD-50-438/81-o8, BLRD-50-439/81 FIRST INTERIM i
REPORT The subject deficiency was initially reported to NRC-0IE Inspector 1
R. V. Crlenjak on October 22, 1981 in accordance with 10 CFR 50.55(e) as NCR 1620. Enclosed is our first interim report. We expect to submit our next report by January 5, 1982. We consider 10 CFR Part 21 applicable to this deficiency.
t 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 Regulation and Safety
[ y'j',h, Enclosure cc:
Mr. Victor Stello, Jr., Director (Enclosure)
Office of Inspection and Enforcement 3r
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U.S. Nuclear Regulatory Commission 67 Ih p
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Washington, DC 20555
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i BELLEFONTE NUCLEAR PLANT UNITS 1 AND 2 CVERTORQUEING.0F BOLTS ON FLOW CONTROL VALVE BLRD-50-438/81-68, BLRD-50-439/81-67 10 CFR 50.55(e)
FIRST INTERIM REPORT Description of Deficiency During torqueing _ operation in the field on' the motor operator adapter to q
the residual heat removal isolation valve (mark No. 3AWO412-ND-3 12-inch ASME III Class 2 motor-operated gate valve), a stud failed. Other studs on examination showed elongation. All studs had been torqued to 518 ft-lbs.
Borg Warner's drawing 80590 requires 500-550 ft-lbs.
Interim Progress Borg Warner was contacted. Their review of the problem showed that the torque value listed on drawing 80590 for the motor operator adapter to yoke.
connection studs was in error.
Borg Warner is to revise the drawing to show the correct torque value (120-140 ft-lbs). TVA will replace the studs using the newly afined torque values and during installation verify that tapped threads in the adapter are not damaged.
Additionally, Borg Warner has been reque sted to review all drawings / contracts supplied to TVA to determine if this situation exists elsewhere.
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