ML20112G010
| ML20112G010 | |
| Person / Time | |
|---|---|
| Site: | Bellefonte  |
| Issue date: | 12/11/1984 |
| From: | Hufham J TENNESSEE VALLEY AUTHORITY |
| To: | James O'Reilly NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II) |
| References | |
| NCR-2707, NUDOCS 8501160144 | |
| Download: ML20112G010 (2) | |
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TENNESEJgggygE,Y AUTHORITY A'NdMM T N
374ot CHA 400 Chestnut Street Tower II BLRD-50-438/84-06 BLRD-50-439/84-05 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 UNITS 1 AND 2 - LENOTHS OF FLEX CONDUIT EXTENSIONS NOT AS SPECIFIED - BLRD-50-438/84-06, BLRD-50-439/84 THIRD INTERIM REPORT The subject deficiency was initially reported to NRC-0IE Inspector P. E. Fredrickson on January 12, 1984 in accordance with 10 CFR 50.55(e) as NCR 2707. This was followed by our interim reports dated February 7 and August 10, 1984. Enclosed is our third interim report. We expect to submit our next report by March 4,1985.
If you have any questions, please get in touch with R. H. Shell at FTS 858-2688.
Very truly yours, TENNESSEE VALLEY AUTHORITY W
.H
, Manager I i ensing nd egulations Enclosure cc: - Mr. Richard C. DeYoung, Director (Enc osure)
Office of Inspection and Enforcement U.S. Nuclear Regulatory Commission Washington, D.C.
20555 Recorda Canter (Enclosure)
Institute of Nuclear Power Operations 1100 circle 75 Parkway, Suite 1500 Atlanta, Georgia - 30339 wncETM An Equal Opportunity Employer f
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r-3 ENCLOSURE BELLEFONTE NUCLEAR PLANT UNITS 1 AND 2 LENGTHS OF FLEX CONDUIT EXTENSIONS NOT AS SPECIFIED BLRD-50-438/84-06, BLRD-50-439/84-05 NCR 2707 10 CFR 50.55(e)
THIRD INTERIM REPORT Description of Deficiency Flexible conduit extensions of the following conduit do not meet the thermal criterion for length:
Existing Flexible Minimum Specified Conduit Size Conduit Extension Extension ID (inches)
Length Exposed (inches)
_ Length (inches) 1R4-1959-B 1-1/2 25.5 32 1R3-1961-B 1-1/2 27 32 1R3-1962-B 1-1/2 24 32 1R3-1964-B 1-1/2 25 32 1R3-19 65-B 1-1/2 21 24 1R3-13 41-B 0.75 22.75 24 General construction specification 0-40, " Installing Electrical Conduit Systems and Conduit Boxes," revision 5, section 3.2.6.3, " Thermal Movement Consideration," specifies that, where flexible conduit is to be connected to items which are part of a mechanical system designed for thermal movement, it should be used to compensate for any expansion and contraction.
The apparent cause of this deficiency was failure to specify that the thermal movement consideration should be applied to these assemblies.
Interim Progress TVA's Office of Engineering (OE) is still in the process of evaluating the plant's mechanical systems with regard to thermal movement. To date OE has identified 36 additional conduits in 4 systems as well as all conduit in the main and reheat steam system which must have an adequate length of flex conduit to compensate for thermal movement.
TVA will provide additional information on this deficiency after the analysis is complete.
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