ML19345B109
| ML19345B109 | |
| Person / Time | |
|---|---|
| Site: | Farley  |
| Issue date: | 11/12/1980 |
| From: | Clayton F ALABAMA POWER CO. |
| To: | Schwencer A Office of Nuclear Reactor Regulation |
| References | |
| NUDOCS 8011260164 | |
| Download: ML19345B109 (2) | |
Text
At:tr.rna P:wer Company d
600 North 18tn street Post Office Box 2641 Birmingnam. Alabama 35291 Telephone 20$ 250-1000 A
L F. L. CLAYTON. JR.
senior Vice President Alabama Power
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ine sournem elec:rc st'em November 12, 1980 2h g) i:~,'l c ra Docket No. 50-364 r.i.E,.Y.0ES
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Director, Nuclear Reactor Regulation
'O U. S. Nuclear Regulatory Comission Phillips Building, Room 116 7920 Norfolk Avenue Bethesda, Maryland 20014 Attention: Mr. A. Schwencer JOSEPH M. FARLEY NUCLEAR PLANT - UNIT 2 CORE SUBC00 LING MONITOR UPGRADE INFORMATION Gentlemen:
During a November 6,1980, telephone conversation, the NRC Staff requested additional infonnation concerning the Farley Nuclear Plant -
Unit 2 core subcooling monitor upgrade. Alabama Power Company hereby submits the following information in response to the Staff's request.
1.
The readout of the core subcooling monitor will be changed
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from " PSI SUBC00 LED" to "0F SUBC00 LED".
This modification l
will include a new meter scale and microprocessor programming changes.
2.
The front panel function switches of the subcooling monitor will be redesignated to delete " TIME TO SATURATION" and incorporate "0F MARGIN" and " PSI MARGIN". This modification will include necessary hardware and required microprocessor programming changes.
3.
The subcooling monitor programing will be modified such that the meter readout will indicate " INVALID" during processor failure rather than maintaining the last valid readout.
4.
The subcooling monitor hardware and programming will be modified to allow for changing caution and alarm setpoints from power operation set to shutdown set.
5.
The internal test routine of the monitor will be reprogrammed to automatically reactuate alanns at the end of test and to permit the verification of the accuracy of the analog meter.
N 8012260 %t
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Mr. A. Schwencer -November 12, 1980
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l 6.
The subcooling monitor programming will be modified such that negative AT values will be displayed with a " " sign if TH or TC is greater than the average T/C temperature.
The software and hardware necessary to complete the modifications to the subcooling monitor are anticipated to be completed and installed by April 30, 1981.
j If you have any further questions, please advise.
Yours very truly, k4 k F. L. Clayton,' Jr.
/
RWS:rt cc: Mr. R. A. Thomas Mr. G. F. Trowbridge Mr. L. L. Kintner Mr. W. H. Bradford i
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