ML19345H230

Final Deficiency Rept Re Spatial Separation for Conduits & Cable Trays,Initially Reported on 810401.Engineering Change Notice Issued to Reroute Conduits to Achieve 20-ft Separation

ML19345H230
Person / Time
Site:	Sequoyah
Issue date:	04/27/1981
From:	Mills L TENNESSEE VALLEY AUTHORITY
To:	James O'Reilly NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II)
References
10CFR-050.55E, 10CFR-50.55E, SQRD-50-328-81, NUDOCS 8105010286
Download: ML19345H230 (2)

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TENNESSEE VALLEY AUTHORITY CH ATT A NCC G A. T E*.*.E 5 5 t.E 3 7.:O f 400 Chestnut Street ' Dower II April 27, 1981 SCRD-50-328/81-27 Mr. James P. O'Fei y, Director j Office of Inspec cn and Enforcement U.S. Nuclear atory Ctanission [%APgj0 ISg7A .)

Regicn II - te 3100 101 Marietta treet Atlanta, gia 30303 7.,

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Dear Mr. O'Reilly:

SEQUCYAH NDCLEAR PIRFr 12T! 2 - SPATIAL SEPAPATICti NR CCEEUr!S AND GBLE TBAYS - SCED-50-328/B1 FINAL REPCRP The subject deficie:rf was initially reported to NIC-CIE Inspec+xt R. V. Crlenjak cn April 1,1981 in accordance with 10 CFR 50.55(e) as ?CR SCN SWP 8112. EmlM is our firal rescrt.

If you have arrf questicns, please get in touch with D. L. Lactert at FTS 857-2581.

Very truly yuirs, TSIM VALIFI AumJF1d L. M. Mills, Manager Nuclear Pegulatien end Safety Enclosure cc Mr. Victor Stello, Director (Enclosure)/

Cffice of Inspecticn and Enforcement U.S. hbclear Regulatory Ccmissicn Washingten, DC 20355 gsIf Sdt .

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ENCELEUNE SIC 00YAH NUCLEAR PIRTT LWIT 2 10 GR 50.55(e)

, SPATIAL SEPAPATICN FOR CONDUITS AND CABLE TPAYS SCRD-50-32S/81-27 FINAL PEPORT Description of Deficiencv During an NFC audit corducted March 30, 1981, it was discovered that the required 20-foot spatial separation between conduits (2PL5025 and 2PL3029) and train A cable trays was not achieved. We conduits serve the reciprocating charging pumps and the train A cable trays contain redundant cables for the centrifugal charging pumps. We 20-fcot separation criterion was specified by the NFC as a result of its auxiliary system branch fire protection review. B is ncnconforming condition is attributable to an incorrect assumption that a 1-1/2-hour fire wall extended frcm the floor to the ceiling to provide the required fire protection; the wall does not actually extend to the ceiling. E is nonconformird condition was an isolated incident.

Safety Implications Had this condition rer.ained uncorrected, the redundancf of essential safety-related equipnent (charging pumps) could have been lost during an exposure fire. - A loss of essential safety-related equiprent such as the chemical and volume control system ccuponents could adversely affect the safe operation of the plant.

Corrective Actions T7A has issued an engineering change notice (KN !b. 2998) to rercute the conduits to achieve the 20-foot separation as required. Rerouting of these conduits will be crapleted before fuel loading of Sequoyah unit 2.

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