ML20092N687
| ML20092N687 | |
| Person / Time | |
|---|---|
| Site: | Nine Mile Point  |
| Issue date: | 06/21/1984 |
| From: | Lempges T NIAGARA MOHAWK POWER CORP. |
| To: | Starostecki R NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION I) |
| References | |
| (NMP2L-0090), (NMP2L-90), NUDOCS 8407030434 | |
| Download: ML20092N687 (2) | |
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M Y NIAGARA L
e RUMOHAWK NIAGARA MOHAWK POWER CORPORATl0N/300 ERIE BOULEVARD WEST. SYRACUSE. N Y.13202/ TELEPHONE (315) 474-1511 June 21, 1984
'(NMP2L 0090)-
Mr. R. W. Starostecki, Director U.S. Nuclear Regulatory Commission Region I Division of Project and Resident Programs 631 Park Avenue King of Pru,ssia, 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 problemconcerningRosemount51000 Racks (55(e)-84-15). This problem was reported in a telephone conversation between Mr. S. Collins, of your staff, and Mr. T. Loomis (Nine Mile Point Unit 2 Licensing) on April 2, 1984 and was followed by an interim report on May 4, 1984.
Very truly yours, T. E. Lempg s Vice President Nuclear Generation TEL/TRL:rla Enclosure xc: Director of Inspection and Enforcement U.S. Nuclear Regulatory Commission Washington, DC 20555 R. A. Gram, Resident Inspector 8407030434 840621 gDRADOCK05000
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NIAGARA M0 HAWK POWER CORPORATION NINE MILE POINT - UNIT 2 DOCKET N0. 50-410 Final Report for a Problem Concerning Rosemount 51000 Racks (55(e) 15)
Description of the Problem The problem concerns Rosemount 51C00 racks installed at Nine Mile Point Unit 2 which are not attached to the rear unistrut supports.
This problem was identified to Niagara Mohawk in General Electric Field Deviation Disposition Request No. KGI-1955.
Analysis of Safety Implications In response to the subject problem, General Electric has provided Niagara Mohawk with the following infonnation:
1.
The Limerick site reported on or about August 1983 that Rosemount DU racks were not correctly mounted in the GE panel assemblies.
The racks were bolted at the front' and supported by an unistrut, but not bolted at the rear.
These racks contain Rosemount trip and
-calibration units that were qualified to seismic test with the racks bolted front and rear and no trip failures occurred during test.
2.
The configuration without rear bolts was tested on a Grand Gulf panel and although trip light flashing was observed, no' failure occurred and it was concluded that the panel met all qualification requirements. Momentary trips during a seismic event may interfere with the operation of the plant if the trip condition is sealed-in; however, they Will not prevent initiation of either a trip-on safety function like ECCS or a trip-off function like reactor protection.
Based on the above information provided by General Electric, if this problem were to have remained uncorrected, it would not have adversely affected the safe operation of the plant; therefore, the criteria for reportability in.
accordance with 10CFR50.55(e) has not been met.
Corrective Action The Rosemount 51000 racks will be attached to the rear unistrut supports by August 31, 1984.
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