ML20198D346
| ML20198D346 | |
| Person / Time | |
|---|---|
| Site: | Bellefonte  |
| Issue date: | 10/16/1985 |
| From: | Hufham J TENNESSEE VALLEY AUTHORITY |
| To: | Grace J NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II) |
| References | |
| NCR-3102, NUDOCS 8511120316 | |
| Download: ML20198D346 (2) | |
Text
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- oe TENNESSEE VALLEY AUTHORITY j
CHATTANOOGA. TENNESSEE 374ot 400 Chestnut Street Tower II A9: 03t l
85 0CT ?[,ber 16,1985 o
BLRD-50-438/84-35 BLRD-50-439/84-32 U.S. Nuclear Regulatory Connaission Region II Attn:
Dr. J. Nelson Grace, Regional Administrator 101 Marietta Steset,'NW, Suite 2900 Atlanta, Georgia 30323
Dear Dr. Grace:
BELLEFONTE NUCLEAR PLANT UNITS 1 AND 2 - USE OF INCORRECT ADAPTORS ON INSTRUMENTATION LINES - BLRD-50-438/84-35, BLRD-50-439/84 FINAL REPORT The subject deficiency was initially reported to NRC-0IE Inspector P.-E. Fredrickson on May 10, 1984 in accordance with 10 CFR 50.55(e) as NCR 3102. This was follcwed by our interim reports dated June 4 and September 21, 1984 and February 25 and July 2, 1985. 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 De:F(
. W. Hufham, Manager Licensing and Risk Protection i
Enclosure cc:
Mr. James Taylor,. Director (Enclosure)
Office of Inspection and Enforcement U.S. Nuclear Regulatory Connaission Washington, D.C.
20555 Records Center (Enclosure)
Institute of Nuclear Power Operations 1100 circle 75 Parkway, Suite 1500 Atlanta, Georgia 30339 a
i 8511120316 851016 i
PDR ADOCM 05000438 1
S PDR I
An Equal Opportunity Employer zen -
Q.
ENCLOSURE BELLEFONTE NUCLEAR PLANT UNITS 1 AND 2 USE OF INCORRECT ADAPTORS ON INSTRUMENTATION LINES BLRD-50-438/84-35 AND BLRD-50-439/84-32 NCR 3102 10 CFR 50.55(e)
FINAL REPORT Description of Deficiency A problem has been identified at Bellefonte Nuclear Dlant (BLN), which involves adaptors (sized 3/4-inch and under) used t( connect instrument piping to instrument tubing. For tube-to-pipe adaptors with TVA mark numbers 142,155,158, 690, 691, 692, and 778, the TVA mark number or schedule is not affixed to the adaptor (they are not required to be), and the proper schedule adaptor required by design drawings may not have been used in all cases.
The cause of this deficiency 19 the lack of schedule identification on the adaptors and the fact that documentation of inspection verification of the adaptor's schedule is not required by present quality control procedures.
TVA has determined that the cited deficiency is not applicable to Watts Bar Nuclear Plant (WBN).
WBN site procedures differ from BLN site procedures in that WBN inspectors are required to determine the correct adaptor schedule from a computer log and compare this to the bill of materials for a given adaptor.
Safety Implications A mismatch in the schedules of pipe-to-tube adaptors used and the schedules required by design drawings could allow the use of adaptors having a wall thickness less than required to assure pressure retention in the respective instrumentation line.
This then could cause various unspecified instrumentation lines to fail with transmittal of spurious signals, which could activate safety equipment inappropriately or could cause erroneous operator response.
Corrective ' Action TVA has evaluated all of the adaptors within the scope of the nonconformance report. All of the adaptors were accepted for use "as is" except for three feedwater system (CF) adaptors.
Sequence Control Chart (SCC) 1CF-1401 was issued to replace the adaptors, and the replacement is complete.
To prevent recurrence of this deficiency, TVA has revised BLN Quality Control Procedure (BLN-QCP) 7.9, "Fitup and Cleanliness," for the welding quality control inspector to verify that the correct adaptor is installed.
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