ML20094A749

Final Deficiency Rept (55(e)-84-13) Re Single Girder Cranes in Diesel Generator Rooms.Initially Reported on 840321. Changes Required by Seismic Analysis Incorporated on Vendor Drawing & Mods to Cranes Will Be Completed by Aug 1985

ML20094A749
Person / Time
Site:	Nine Mile Point
Issue date:	10/15/1984
From:	Mangan C NIAGARA MOHAWK POWER CORP.
To:	Starostecki R NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION I)
References
(55(E)-84-13), (NMP2L-0202), (NMP2L-202), NUDOCS 8411060520
Download: ML20094A749 (2)

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NIAGARA MOHAWK POWER CORPORATIOPs/300 ERIE BOULEVARD WEST. SYR/,CUSE. N.Y.13202/ TELEPHONE (315) 474-1511'

-k October 15, 1984 (NMP2L 0202)'

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 .10CRF50.55(e) for the -

problem concerning the single girder cranes in the diesel generator rooms.

.This problem was reported via tel-con to Mr. S. Collins of your staff on March 21, 1984. An interim report was submitted via our letter dated April 18, 1984 Very truly yours, C. V. Manga Vice President Nuclear Engineering and Licensing CVM/GG/pbd xc: Director of Inspection and Enforcement U.S. Nuclear Regulatory Comission Washington, DC 20555 R. A. Gramm, NRC Resident Inspector Project File (2) l l

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i NIAGARA MOHAWK' POWER CORPORATION NINE MILE POINT - UNIT 2 DOCKET NO. 50-410 Find Report for a Problem Concerning Cranes'in the Diesel Generator Rooms (55(e)-84-13)

Description of the Problem This subject concerns three single girder crac which are located in the diesel generator rooms for servicing the correspre ng diesel _ generators.- The runway beams are designed as seismic Category I but the cranes were not seismically qualifled. The problem was identified by the Nuclear Regulatory Commission during Inspection No. 84-01.

In its original parked position, each of the three cranes was designed so that if it had fallen as a result of a seismic event, a crane or crane parts would not impact its corresponding diesel generator. As a result of a design change, the cranes' parked positions were changed. In the new parked  !

position, a crane or its parts could have impacted the diesel generator if it did fall during a seismic event.

Analysis of Safety Implications If a crane or ' its parts would have impacted its corresponding diesel generator, it may have prevented that diesel from performing its design

~ function. Therefore, the safety of operations of the plant could have been adversely affected. As a resul t, the criteria for reportability under 10CFR50.55(e) have been met.

Corrective Actions

, The subject cranes have been seismically analyzed. The changes required by the seismic analysis have been incorporated on the vendor drawing (Stone &

Webster File No. 2.400-018-060C), and the modifications to the cranes will be completed by August 1985.

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