ML20005A629
| ML20005A629 | |
| Person / Time | |
|---|---|
| Site: | Farley  |
| Issue date: | 06/25/1981 |
| From: | Clayton F ALABAMA POWER CO. |
| To: | Tedesco R Office of Nuclear Reactor Regulation |
| References | |
| IEIN-79-22, TAC-46589, TAC-46589C, NUDOCS 8106300515 | |
| Download: ML20005A629 (2) | |
Text
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Meiling Address Alabama Power Company o
600 North 18th street Post Office Box 2641 Birmingham, Alabama 35291 A
Telephone 205 783-6081 F. L Clayton, Jr.
Senior Vice President g g h 3 g g g gg g Flintridge Building ttvt scathern eectrc system June 25, 1981 Docket No. 50-364
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' 2 0 E" Mr. Robert L. Tedesco, Assistant Director for Licensing, Division of Licensing
.f U 8' M7 Office of Nuclear Reactor Regulation O. S. Nuclear Regulatory Comission
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Washington, D. C.
20555
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HIGH ENERGY LINE BREAK AND CONSEQUENTIAL CONTROL SYSTEM FAILURES
Dear Mr. Tedesdo:
This is in response to your letter of April 28, 1981 concerning a review to determine what, if any, desigt. changes or operator actions would be necessary to assure that high energy line breaks will not cause control system failure to complicate the event beyond the FSAR analysis. On October 5,1979 Alabama Power Company responded to this action for Unit 1 of the Joseph M. Farley Nuclear Plant. That response C so applies to Unit 2.
Additionally, as a result of the I&E Notice 79-22 and the subsequent study, two modifications were made to the plant Pressurizer PORV's and the Atmospheric Relief Valves. The plant PORV's were modified to incorporate a seismic bottled gas supply for emergency operation. TFe bottled gas is located in the auxiliary building and put into each PORV iust ahead of its normal air supply. On Unit 1 the unqualified solenoid valves were replaced by environmentally qualified ASCO NP 8316-54V solenoid valves.
In con-junction with 10CFR50, Appendix R walkdowns and evaluation, action is being taken to protect from damage power and control cabling to PORV and block valves.
The atmospheric relief valves were modified to incorporate two solenoid valves in their air supply system betwean the positioner and valve actuator. One of ?.he solenoids was locat-at the valve and one was located below the steam room for access. These will prevent the atmospheric relief valves from opening inadvertently due to positioner failure and will allow the operator to actuate the valves using the i
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W Mr. Robert L. Tedesco June 25, 1981 emergency air system when there is a steam line-break in the main steam room and the atmosphere is too severe for the positioner. The solenoid at the atmospheric relief valves is an environmentally qualified ASCO Model 206-381-50.
If you have any questions, please advise.
Yours very trGTX, Ib
[k.L.Clayton,Jr.-
FLCjr/ JAR:rt cc: Mr. P.. A. Thomas Mr. G. F. Trowbridge Mr. J. P. O'Reilly Mr. J. O. Thoma Mr. W. H. Bradford e
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