ML20082B842

Final Deficiency Rept Re Use of Unqualified GE Control Rod Drive Sys Clamps.Initially Reported on 830405.ASME- Qualified Clamps Installed on Piping

ML20082B842
Person / Time
Site:	Nine Mile Point
Issue date:	10/28/1983
From:	Mangan C NIAGARA MOHAWK POWER CORP.
To:	Starostecki R NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION I)
References
10CFR-050.55E, 10CFR-50.55E, 7612, NUDOCS 8311210347
Download: ML20082B842 (2)

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M V NIAGARA RuMOHAWK NIAGARA MOHAWK POWER CORPORATION /300 ER:E BOULEVARD WEST, SYRACUSE N.Y.13202/ TELEPHONE (315) 474-1511 Octobe.r 28, 1983 (7612)

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 control rod drive system clamps. This condition was reported via telecon to Mr. H. Kister of your staff on April 5,1983 as a potentially reportable deficiency. Interim reports were submitted via our letters dated May 4, 1983 and September 1, 1983.

Very truly yours, WWW C. V. ManganO Vice President Nuclear Engineering & Licensing CVM/TL:Ja Enclosure xc: Director of Inspection and Enforcement U.S. Nuclear Regulatory Commission Washington, DC 20555 Mr. R. Gramm, Resident Inspector 8311210347 831028 PDR ADOCK 05000410 ,%

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NI AGARA M0 HAWK POWER CORPORATION NINE MILE POINT - UNIT:2 DOCKET NO. 50-410 ,

. Final Report for a Problem l Concerning Control Rod Drive System Clamps 4

Description of the Problem Control rod drive system piping clamps were supplied by General Electric Company as part of shop-installed reactor vessel internals. The clamps restrain General' Electric-supplied piping in the' area ofLthe control: rod drive housing. Reactor Controls, Incorporated utilized these. supports-as' ASME-qualified pipe supports in the control rod drive piping analysis. Since that time, General Electric has informed Stone & Webster Engineering Corporation.

that these clamps are not ' ASME-qualified and were intended for use only as i shipping clamps.

! Analysis of Safety Implications As stated above, the clamps restrain General Electric-supplied piping in the area of the control rod drive housing. - There is a possibility that if this -

problem were to have remained uncorrected, it could have adversely affected the safe operation of the plant. A detailed analysis of safety. implications

' was not performed because the corrective action as outlined below has been-taken.

Corrective Action Niagara Mohawk has removed all the subject General Electric clamps.

j ASME-qualified clamps have been installed on the contro.1 rod system piping.

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