ML20115B032
| ML20115B032 | |
| Person / Time | |
|---|---|
| Site: | Crane  |
| Issue date: | 10/08/1992 |
| From: | Broughton T GENERAL PUBLIC UTILITIES CORP. |
| To: | NRC OFFICE OF INFORMATION RESOURCES MANAGEMENT (IRM) |
| References | |
| C311-92-2103, GL-89-10, NUDOCS 9210150242 | |
| Download: ML20115B032 (2) | |
Text
L i GPU Nuclear Corporation g
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Post Office Box 480
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Route 441 South Middletowr., Pennsylvania 17057 0191 717 944 7621 TELEX 844386 Writer's Direct Dial Nurnber:
(717) 948-8005 October 8, 1992 C311-92-P.103 U. S. Nuclear Regulatory Commission Attention:
Document Control Desk Washington, D.C.
20555 Gentlemen:
Subject:
Three Mile Island Nuclear Generating Station (TMI-1)
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Operating License No. DPR-50 Docket No. 50-289 Generic Letter 89-10, Motof Operated Valve Program Scope This latter provides the basis for removing three motor operated valves from the scope of the Generic l.etter 89-10 (G.L. 89-10) Motor Operated Valve (MOV) program for THI-1.
Ar previously identified in the THI-l Generic Letter (G.L.)
89-10 MOV Program Description, Revision 1, Table 3, the applicability of G.L.
89-10 was being evaluated for valves NR-V-18, NR-V-19, and AS-V-4.
These valves are currently included in the G.L. 89-10 program due to potential inadvertent operation (mispositioning).
Inadvertent operation of valves NR-V-18 and NR-V-19 will be prevented by installing ccvers over the valve switches in the Control Room.
Discussion with the NRC Inspection Team during the TMI inspection in June, 1992 indicated that a cover over the Control Room panel sWtch was considered an moropriate means of preventing inadvertent operation.
The switch covers for L.
18 and NR-V-19 will not be locked in place, but will provide a physical obstacle to the operator which should preclude a potential inadvertent operation.
a The function of valve AS-V-4 is to supply auxiliary steam from the auxiliary boiler to the emergency feedwater pump turbine, if main steam is not available.
This function is not part of the aesign basis accident analysis requirements and is not required to mitigate the consequences of any design basis event.
The valve also maintains main steam line pressure boundary.
Since AS-V-4 is a stop-check valve, this function will be maintained irrespective of valve positioc, and mispositioning will not impact this pressure boundary function.
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.Page 2 These valves therefore are'being removed from the G.L. 89-10 ' program scope.
GPUN intends to complete the above modifications by startup following the 109 outage.
Installation of control room panel switch covers may be considered in the future for other motor-operated valves which also are included in the-scope of G.L. 89-10 only bec:use of the potential for inadvertent operation.
Sincerely, b
T. G. Bro hton Vice President and Director, THI-1
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Repton I, Administrator THI-1 Senior Resident Inspector TMI-1 Senior Project Manager I-l l
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