ML20057C091
| ML20057C091 | |
| Person / Time | |
|---|---|
| Site: | Crane  |
| 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 u 2 Nuclear
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Middletown, Pennsylvania 17057-0480 (717)944-7621 Writer's Direct Dial Number:
(717) 948-8005 September 21, 1993 C311-93-2135 U. S. Nuclear Regulatory Commission Attn: Document Control Desk Washington, DC 20555
Dear Sir:
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 Lg['
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address the Supplement 5 concerns.
s 9309270055 930921
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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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'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 i
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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 l
GENERAL PUBLIC UTILITIES NUCLEAR CORPORATION 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
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l GPU Nuclear Response to NRC Generic Letter 89-10, Supplement 5 This letter is submitted in response to NRC Generic Letter 89-10, Supplement 5, " Inaccuracies in Motor-0perated Valve Diagnostic Equipment."
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 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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