ML20065L777
| ML20065L777 | |
| Person / Time | |
|---|---|
| Site: | Fermi  |
| Issue date: | 10/11/1982 |
| From: | Tauber H DETROIT EDISON CO. |
| To: | Kintner L Office of Nuclear Reactor Regulation |
| References | |
| EF2-59-304, NUDOCS 8210190696 | |
| Download: ML20065L777 (2) | |
Text
r Harry Tauber nd Constructen
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October 11, 1982 EF2 - 59,304 Mr. L. L. Kintner U. S. Nuclear Regulatory Commission Office of Nuclear Reactor Regulation Division of Licensing Washington, D. C. 20555
Dear Mr. Kintner:
References:
(1)
Enrico Fermi Atomic Power Plant, Unit 2 NRC Docket No. 50-341 (2)
Letter Detroit Edison to NRC,
" Inservice Inspection of Pressure Isolation Valves", EF 2-52,674,
June 3, 1981
Subject:
Inservice Inspection of Pressure Isolation Valves The Reference 2 letter provided justification for taking exception to leak testing every time a valve is moved from its fully closed position on the basis that, among other things, full closure is verified in the control room by direct monitoring, including check valves. This position was accepted in Section 3 9 6.2 of the Fermi 2 Safety Evaluation Report.
Further clarification is required with reference to check valves.
Direct monitoring is included for the block and check valves listed in Reference 2 with the exception of HPCI and RCIC system check valves (E41-F005 and E51-F009).
Reviewing the configuration for these systems, Detroit Edison has decided to mod-ify the designation of the pressure isolation valves.
In addition to check valve E41-F005, gate valve E41-F007 will also serve as an outside pressure isola-tion valve on the HPCI system.
Likewise, on the RCIC system gate valve, E51-F012 will supplement check valve
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E51-F009 The inservice inspection program will be modified to delete the check. valves and add the spe-cified gate valves for category Type A testing.
The normal operating configuration will remain the same, 8210190696 821011 PDR ADOCK 05000341 O a PDR -
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- .c Mr. L. L.'Kintner October 11'304 1982 EF2 - 59, Page 2 1.e. valves E41-F007 and E51-F012 open.
However, if excessive leakage occurs through the normally closed gate and check valves, the operator will be alerted to-the: fact by an alarm in the control room of high pressure on the suction side.
Operating procedures will require shptting the normally open pressure iso-lation valve.
Position of these valves is indicated in the control room.
These design features provide better protection than check valve position monitoring for these two systems.
This clarification will be factored into the FSAR in a forthcoming amendment.
Should you have any further questions, please contact Mr. L. E. Schuerman (313-649-7562).
Sincerely,
.[
M' cc:
B. Little
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