ML20050A959
| ML20050A959 | |
| Person / Time | |
|---|---|
| Site: | Bellefonte  |
| Issue date: | 03/23/1982 |
| From: | Mills L TENNESSEE VALLEY AUTHORITY |
| To: | James O'Reilly NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II) |
| References | |
| REF-PT21-82 10CFR-050.55E, NUDOCS 8204020447 | |
| Download: ML20050A959 (2) | |
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, ec TENNESSEE VALLEY AUTHORITY
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CH ATTANOOG A, TENNESSEE 37401 7
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March 23, 1982 BLRD-50-438/81-05 N
BLRD-50-439/81-06
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s U.S. Nuclear Regulatory Commission IECENED Region II P-Attn:
Mr. James P. O'Reilly, Regional Administrator APR1 1982 > li q
101 Marietta Street, Suite 3100
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Atlanta, Georgia 30303 E
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Dear Mr. O'Reilly:
BELLEFONTE NUCLEAR PLANT UNITS 1 AND 2 - LAMBDA POWER MODULE FAILURES -
BLRD-50-438/81-05, BLRD-50-439/81 REVISED FINAL REPORT The subject deficiency was initially reported to NRC-0IE Inspector R. W. Wright on December 18, 1980 in accordance with 10 CFR 50.55(e) as NCR BLN EEB 8006. This was followed by our first interim report dated January 19, 1981 and our final report dated July 21, 1981. As discussed with R. V. Crlenjak by telephone on March 11, 1982, enclosed is our revised final report. We consider 10 CFR Part 21 applicable to this deficiency.
The reason for the revision is to change the expected completion date of the corrective action. The date was not met because the equipment containing the defective capacitors is currently being used for construction testing activities. This equipment trust be deenergized before hardwara replacement takes place. Because of the construction flush schedule, TVA has been unable to make the equipment available for replacement of defective parts.
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.* ills, Mariager Nuclear Regulation and Safety Enclosure cc:
Mr. Richard C. DeYoung, Director (Enclosurej Office of Inspection and Enforcement U.S. Nuclear Regalatory Commission Washington, DC 20555 SY L, c2 '7 8204020447 820323 4
PDR ADOCK 05000438
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S PDR An Equal Opportunity Employer
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ENCLOSURE BELLEFONTE NUCLEAR PLANT UNITS 1 AND 2 LAMBDA POWER MODULE FAILURES DLRD-50-438/81-05, BLRD-50-439/81-06 10 CFR 50.55(e)
REVISED FINAL REPORT Description of Deficiency t
In the process of cleaning Jul preparing capacitor charge plates for Lambda typ LXS-E-24-R power supplies, a solvent was applied which adversely affected the dielectric substance. The solvent's contamination of the dielectric results in an inability to fully charge the capacitor plates and may result in effectively short circuiting th? capacitor.
Safety Implications The short circuiting of the subject capacitors could result in the power supply's diode failure and subsequently in a discontinuation of a regulated power source. Loss of power supply in the essential controls and instrumentation would degrade the safe operation of the plant.
Corrective Action The Bailey Meter Company supplies the subject printed circuit boards (PCB) for the Lambda type LXS-E-24-R power supplies. Bailey Meter has inforced the NS3S supplier (Babcock & Wilcox) that they will change their procedure concerning cleaning of the PCB's.
In the future, Bailey Meter Company will clean the subject PCB's without the subject capacitors installed. A halogen cleaning solvent will continue to be used.
Bailey Meter Cc=pany has informed the capacitor manufacturer, Sprague, that halogen solvent is reacting with the exposed edge foil of their capacitors. Sprague, in turn, has remedied the process by epoxy coating the exposed foil.
TVA will continue to monitor these power supplies in order to ensure that the implementation of the new Bailey Meter procedures is effective.
Babcock & Wilcox has furnished field change No. 122 (including replacement hardware and installation procedures). This field change was approved by TVA on March 23, 1981.
Construction employees will complete the implementation of field change No. 122 by June 1, 1982.
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