ML20215M539

Final Deficiency Rept (55(e)-86-11) Re Category I Components in non-Category I Stair Tower.Initially Reported on 860610. Stair Tower Will Be Braced to Resist Seismic Forces Prior to Fuel Load

ML20215M539
Person / Time
Site:	Nine Mile Point
Issue date:	07/10/1986
From:	Lempges T NIAGARA MOHAWK POWER CORP.
To:	Starostecki R NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION I)
References
(55(E)-86-11), (NMP2L-0775), (NMP2L-775), NUDOCS 8611030010
Download: ML20215M539 (2)

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M V NIAGARA RuMOHAWK NIAGARA MOHAWK POWER CORPORATION /300 ERIE BOULEVARD WEST, SYRACUSE. N.Y.13202/ TELEPHONE (315) 4741511 July 10, 1986 (NMP?l 0775) l l

Mr. R. W. Starostecki, Director U.S. Nuclear Regulatory Commission )

Region I Division of Project and Resident Programs 631 Park Avenue King of Prussia, PA 19406 Re: Nine Mile Point Unit 2 Docket No. 50-410

Dear Mr. Starostecki:

Enclosed is a final report, in accordance with 10CFR50.55(e), for the problem concerning Category I components in a non-Category I stair tower.

This problem was reported via telecen to G. Meyer of your staff on June 10, 1986.

Very truly yours, T. . Lemp es Vice President Nuclear Generation TEL/TRL:ja 1824G Enclosure xc: Director of Inspection and Enforcement U.S. Nuclear Regulatory Commission Washington, DC 20555 W. A. Cook, Resident Inspector Project File (2) 8611030010 860710 PDR ADOCK 05000410 S PDR f ,y

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NIAGARA M0 HAWK POWER CORPORATION NINE MILE P0 INT UNIT 2 DOCKET NO. 50-410

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Fina1 Report for a Problem Concerning Category I Components in a Non-Category I Stair Tower 4

( 55(e)-86-11 )

Description of the Problem NRC Violation 86-09-46 stated that Class 1E conduits were routed in the reactor building stair tower which is a non-Category I structure. Further investigation indicated that five Class 1E electrical conduits, three junction boxes, and two Quality Assurance Category I tubing runs have been installed in the reactor butiding stair tower. These tubing runs are used to supply air samples from heating, ventilation and air conditioning ducts in the reactor building to the radiation monitors. The conduits are used to route cables for resistance temperature detector circuits associated with heat tracing for the tubing runs. The tubing and conduit are attached to the QA Category I reactor building.

Analysis of Safety Implications The non-Category I reactor building stair tower structure could have failed during a seismic event. A failure of the stair tower could have damaged the

, subject Class 1E/ Category'I components. As a result, the function of the radiation monitors to isolate the reactor building ventilation system on high radiation levels in the effluent stream could have been compromised.

Therefore, had this condition remained uncorrected, it could have adversely

affected the safety of operations of the plant.

Corrective Action The stair tower will be braced in accordance with Engineering and Design Coordination Report No. Yl8141 to resist seismic forces. The work will be completed prior to fuel load.

In' the response to the subject violation (85-09-46), we had committed to

, provide the results of the review to determine if any other Caregory I equipment is located in non-Category I areas. This review identified one additional area where functioning of Category I components could have been affected by the failure of adjacent non-Category I structures / components.

i This area has been evaluated and the corrective action will be implemented in 2

accordance with Engineering and Design Coordination Report Nos. Y21402A, Y21441, Y21442 and M50009-and Nonconformance and Disposition Report No.

16719. The corrective action includes providing shielding for the Category I components and rerouting of the conduits. The work will be completed prior to fuel load. In addition, other Category I components in non-Category I areas were identified and evaluated.- The evaluation confirmed that the original design / functioning of these components would not have been affected by the failure of adjacent non-Category I structures / components.

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