ML20100P065
| ML20100P065 | |
| Person / Time | |
|---|---|
| Site: | Bellefonte  |
| Issue date: | 11/19/1984 |
| From: | Hufham J TENNESSEE VALLEY AUTHORITY |
| To: | James O'Reilly NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II) |
| References | |
| NCR-2684, NUDOCS 8412130618 | |
| Download: ML20100P065 (2) | |
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TENNEC ghEY, NU11HORITY CH ATTgoG A. YEN N ES$
401 400 Chestnut Street Tower II g4QVINresEHlr 1,1984 BLRD-50-438/84-05 U.S. Nuclear Regulatory Commission Region II Attn: Mr. James P. O'Re.tlly, Regional Administrator 101 Marietta Street, NW, Suite 2900 Atlanta, Georgia 30323
Dear Mr. O'Reilly:
BELLEFONTE NUCLEAR PLANT UNIT 1 - LENGTH OF INCORE MONITCRING SYSTEM PIPING AND OAUGE - BLRD-50-438/84 FINAL REPORT The subject deficiency was initially reported to NRC-0IE Inspector C. A. Julian on December 30, 1983 in accordance with 10 CFR 50.55(e) as NCR 2684. This was folloued by our interim reports dated January 26 and June 28,1984. Enclosed is our final report. If you have any questions, please get in touch with R. H. Shell at FTS 858-2688. Very truly yours, TENNESSEE VALLEY AUTHORITY g
- f. d. M hJ. W. Hufham, Manager Licensing and Regulations Enclosure oo: 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 Nuclear Power Operations 1100 circle 75 Parkway, Suite 1500 Atlanta, Georgia 30339 8412130618 841119 PDR ADOCK 05000438 OFFICI AL COP), B POR An Equal Opportunit/ Employer k
i y-ENCLOSURE BELLEFONTE NUCLEAR PLANT UNIT 1 LENGTH OF INCORE MONITORING SYSTEM PIPING AND GAUGE BLRD-50-438/84-05 NCR 2684 10 CFR 50.55(e) FINAL REPORT Description of Deficiency All incore monitoring system piping for unit 1 was cut approximately 1-1/2 inches too long as a result of an error in establishing the-length of the gauge used to measure each pipe. The cause of this deficiency was. misinterpretation of lengths of the certified chain. The first foot is graduated in tenths of a foot and site engineering and QC personnel interpreted this as inches which msulted in this deficiency. Safety Implications The safety. problem arises due to the use of the incore detectors to calibrate and position the excore detectors. The execce detectors are sensitive to position dianges and are used in the control of safety-related equipment during an accident. Therefore, had this condition remained uncorrected, it could have adversely affected the safe operation of the plant. Corrective Action Based on the recommendations contained in Babcock and Wilcox's (B&W) letter i* No. D-5153 to TVA dated July 9,1984, TVA decided to mmeasure and rework all of the unit 1 incore monitoring system pipes to an acceptable length. No mdesign is involved in this decision. Forty-five of the 62 pipes have been cut and reworked to an acceptable length. The remaining 17 pipes will be remeasund and reworked as necessary when they' become accessible. To prevent mourrence of this deficiency, a training session was held for all applicable instrumentation personnel. The importance of being totally familiar with equipment used in tests and measurements was emphasized to these personnel. Also, all future incore monitoring system pipe measurements are to be made in accordance with B&W's letter No. D-5153 All corrective action for this deficiency will be completed by February 1, 1985.- V o}}