ML20057C091

Responds to Generic Ltr 89-10,Suppl 5.Licensee Reevaluated All 28 Valves & Determined That Valves Able to Perform Required Safety Function

ML20057C091
Person / Time
Site:	Three Mile Island
Issue date:	09/21/1993
From:	Broughton T GENERAL PUBLIC UTILITIES CORP.
To:	NRC OFFICE OF INFORMATION RESOURCES MANAGEMENT (IRM)
References
C311-93-2135, GL-89-10, NUDOCS 9309270055
Download: ML20057C091 (3)

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GPU Nuclear Corporation 2 Nuclear u " = se i Middletown, Pennsylvania 17057-0480 (717)944-7621 Writer's Direct Dial Number:

(717) 948-8005 ,

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September 21, 1993  ;

C311-93-2135 l

U. S. Nuclear Regulatory Commission Attn: Document Control Desk Washington, DC 20555

Subject:

Three Mile Island Nuclear Station, Unit 1 (TMI-1)

Operating License No. DPR-50 Docket No. 50-289 Response to Generic Letter 89-10, Supplement 5 F

In response to Generic Letter (GL) 89-10, Supplement 5 GPU Nuclear is using ITI-M0 VATS diagnostic equipment at Three Mile Island, Unit 1 (THI-1). TMI-1 began using Liberty Technologies diagnostic equipment during the 10R outage, currently in progress. TMI-1 has not used and is not intending to use ABB-Impell diagnostic equipment.

1MI-l did use ITI-MOVATS diagnostic equipment for GL 89-10 valves applying the -

TMD/ Load Cell method of calibrating the motor operator thrust in the open direction; this calibration was used to determine closing thrust. The issue of concern was addressed in TMI-l Potential Safety Concern (PSC)92-001 which was initiated on March 16, 1992, as a result of correspondence from ITI-MOVATS. It was determined that the TMD/ Load Cell method was used to predict closing thrust for 28 TMI-l valves. All 28 valves were re-evaluated. i The final determination was that all 28 valves were and are able to perform their required safety function.

The TMI-1 Program Description for NRC GL 89-10 Motor-0perated Valves was revised to state that the direct measurement of thrust is to be taken in the safety function direction. The TMD/ Load Cell evaluation method for valves with a "close" safety function is no longer being used at TMI-1. For valves '

with an "open" safety function using the TMD/ Load Cell method, an evaluation of closing thrust using ITI-MOVATS Engineering Report EP. 5.2 will be required for weak link comparisons.

TMI-l is using the Liberty Technologies diagnostic equipment in the current 10R outage. TMI-I is using the latest Liberty Technologies software to address the Supplement 5 concerns. }

9309270055 930921 _i :

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, , , , , PDR ADOCK 05000289 GPU Nu lear Corporation is a subs a y of IIeral Public Utikties Corporation

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. C311-93-2135 Page 2 of 2

'In summary, GPU Nuclear is. aware of the issues ' identified in GL 89-10, .

Supplement 5 and has taken appropriate actions. GPU Nuclear will continue to

• be sensitive to diagnostic equipment inaccuracies..

Sincerely,

h. k T. G. Broug on Vice President and Director, TMI-1 DVH/ emf Attachment  !

cc: Region I Administrator TMI-1 Senior Project Manager TMI Senior Resident Inspector .

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. ATTACHMENT l

C311-93-2135 i

1 METROPOLITAN EDIS0N COMPANY i JERSEY CENTRAL POWER AND LIGHT COMPANY  ;

l PENNSYLVANIA ELECTRIC COMPANY GENERAL PUBLIC UTILITIES NUCLEAR CORPORATION l

Three Mile Island Nuclear Station, Unit 1 (TMI-1)

Operating License No. DPR-50 Docket No. 50-289

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COMMONWEALTH OF PENNSYLVANIA)

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DAUPHIN OF COUNTY )

GPU Nuclear Response to NRC Generic Letter 89-10, Supplement 5 l  ;

This letter is submitted in response to NRC Generic Letter 89-10, Supplement 5, " Inaccuracies in Motor-0perated Valve Diagnostic Equipment." i All statements contained in this response have been reviewed and all such statements made and matter set forth therein are true and correct to the best l of my knowledge. ,

T. G. Brough1(Jn Vice President and Director, THI-l l

l Signed and sworn before me this 21st day of September , 1993.

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