ML20209H029
| ML20209H029 | |
| Person / Time | |
|---|---|
| Site: | Crane  |
| Issue date: | 01/29/1987 |
| From: | Hukill H GENERAL PUBLIC UTILITIES CORP. |
| To: | NRC OFFICE OF INFORMATION RESOURCES MANAGEMENT (IRM) |
| References | |
| 5211-87-2022, NUDOCS 8702050514 | |
| Download: ML20209H029 (2) | |
Text
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GPU Nuclear Corporation Ngg1g7 Post Office Box 480 Route 441 South Middletown, Pennsylvania 17057 0191 717 944 7621 TELEX 84 2386 Writer's Direct Dial Number:
January 29, 1987 5211-87-2022 U.S. Nuclear Regulatory Commission Attention: Document Control Desk Washi ngton, D.C.
20555
Dear Sir:
Ti ee Mile Island Nuclear Station Unit 1 (TMI-1)
Operating License No. DPR-50 Docket No. 50-289 10 CFR 50 Appendix R - Fire Effects on Air Lines The TMI-1 Fire Hazards Analysis Report (FHAR), Revision 7, submitted to NRC November 7, 1985 (5211-85-2177), Sect. ion 3.10, stated that the fire effects on air lines were being evaluated and design changes would be made, if necessary, to assure operation of valves which require air to operate after a fire in the area. This evaluation has been completed as stated in draf t FHAR, Revision 8.
Per NRC verbal request, the following discussion provides a description of the study performed and the basis for the results obtained.
The intent of this study was to determine if certain air-operated valves required to function for safe plant shutdown af ter an Appendix R postulated fire would be operable.
In addition to normal instrument air if nes, many of these valves have back-up air lines, local reservoir bottles, handwheels, or a combination of these. Additionally, some have functions that can be served by other (redundant) valves.
In order to satisfy Appendix R safe shutdown requirements, the assumption that certain air-operated valves would remain operable after a fire had to be confirmed through a case-by-case evaluation. The valve function, time period before required function, extent of postulated fire in its location, and existence of possible alternatives or redundancies were all examined. The scope of this investigation included all air-operated valves that may require manual operation af ter an Appendix R fire, as identified in FHAR Attachment 3-7 (Rev. 7) and GPUN letter to NRC dated July 22, 1986 (5211-86-2124). Also, EF-Y-30A, 308, 30C and 300, MS-V-4A and 4B and MS-V-6 were subsequently identified as air operated valves which may require manual operation after an Appendix R fire and were therefore evaluated.
It was determined that the air-operated valves listed as requiring manual operation either have redundant operating methods (backup air lines, local reservoir bottles, hand wheels or a combination thereof) or are redundant to other valves or systems which can be manually operated to perform the same f unction. The exception to this is WDL-Y-1, 2, 3, 4 a nd 5.
Emergency
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o 5211-87-2022 January 29, 1987 procedures will implement the requirement to connect an external air or nitrogen supply to compensate for loss of air or damage to air lines for valves WDL-Y-1 and either WDL-V-3, 4 or 5.
Connections for these operations will be provided.
Emergency procedures will also implement the requirement to disconnect the air supply to valve WDL-V-2 if normal operation is not possible. These actions are required within four hours, as described in FHAR, Rev. 7, therefore sufficient time is available for these actions. This is consistent with previously submitted exemption requests.
The conclusion is that air-operated valves relied upon for post-Appendix R fire safe shutdown have adequate back-up operation capability or alternate valve redundancy, or sufficient time exists for corrective actions to be taken to fulfill Appendix R requirements.
If any further information is required, please contact us.
Sincerely,
. D. Hukill Vice President and Director, TMI-l HDH/DJD/pa(1795g) cc:
J. Stolz, USNRC T. Murley, USNRC Region I J. Thoma, USNRC D. Kubicki, USNRC A. Krasopoulos, USNRC, Region I F. Young, USNRC
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