ML20090A952
| ML20090A952 | |
| Person / Time | |
|---|---|
| Site: | Bellefonte  |
| Issue date: | 06/28/1984 |
| From: | Mills L TENNESSEE VALLEY AUTHORITY |
| To: | James O'Reilly NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II) |
| References | |
| NCR-2815, NUDOCS 8407120196 | |
| Download: ML20090A952 (2) | |
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TENNESSEE VALLEY AUTHORITY CHATTANOOGA. TENNESSEE 374ol 400 Chestnut Street Tower II g g} 2. Jtfhk 28 984 ELRD-50-439/84-15 U.S. Nuclear Regulatory Commission Region II Attn:
Mr. James P. O'Reilly, Regional Administrator 101 Marietta Street, NW, Suite 2900 Atlanta, Georgia 30323
Dear Mr. O'Reilly:
BELLEFONTE NUCLEAR PLANT UNIT 2 - DEFECTIVE AMPLIFIERS IN SAFETY-RELATED PANELS MANUFACTURED BY EL-TEX - BLRD-50-439/84 SECOND INTERIM REPORT The subject deficiency was initially reported to NRC-0IE Inspector P. E. Fredrickson on February 14, 1984 in accordance with 10 CFR 50.55(e) as NCR 2815. This was followed by our interim report dated March 5,1984.
Enclosed is our second interim report. We expect to submit our next report by October 16, 1984.
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, Manager 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)
Institute of Naclear Power Operations 1100 Circle 75 Parkway, Suite 1500 Atlanta, Georgia 30339 8407120196 840628 DR ADOCK 05000 qC{YM 1983-TVA SOTH ANNIVERSARY
\\g An Equal Opportunity Employer
ENCLOSURE BELLEFONTE NUCLEAR PLANT UNIT 2 DEFECTIVE AMPLIFIERS IN SAFETY-RELATED PANELS MANUFACTURED BY EL-TEX BLRD-50-439/84-15 NCR 2815 10 CFR 50.55(e)
SECOND INTERIM REPORT Description of Deficiency All DC isolation amplifiers in electrical panels 2EU-EDP-52A-E and 2EU-EDP-51 A-E were found to be defective. These amplifiers are powered by a 125V AC supply, and send a 0-3 milliamp (ma) signal to the main control room indicators which show the status of the class 1E 125V DC power distribution system. This system provides power to various assential safety-related switches such as the 6.9 kV, 13.8 kV, and 480V switchgear.
The failure of the amplifiers has resulted in a wide open (i.e., maximum 3 ma) output to the indicators, regardless of the input signal. This results in erroneous indications in the control room on the status of the 125V DC system.
Interim Progress TVA is still evaluating this deficiency to determine what corrective actions will be taken. The defective amplifiers are being returned to the vendor (El-Tex Industries, Incorporated, Baltimore, Maryland) for analysis to determine the reason for failure. TVA will determine the necessary corrective action and action to prevent recurrence based on the results of this analysis.
TVA has also identified that similar components were received for use at TVA's Yellow Creek Nuclear Plant. TVA Quality Bulletin 84-09 has been issued to place this equipment in a " hold" status until resolution of this deficiency.
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