ML20062L578
| ML20062L578 | |
| Person / Time | |
|---|---|
| Site: | Farley  |
| Issue date: | 02/03/1981 |
| From: | Clayton F ALABAMA POWER CO. |
| To: | Schwencer A Office of Nuclear Reactor Regulation |
| References | |
| NUDOCS 8102090396 | |
| Download: ML20062L578 (6) | |
Text
Alabama Power Company 0'
600 North 18th street Post Office Box 2641 Birmingham. Alabama 35291 Telephone 205 250-1000 l
F. L CLAYTON, JR.
senior Vice President yghgg3 gggrg the sottwr ynre uvem February 3, 1981 Docket No. 50-348 Docket No. 50-364 Director, Nuclear Reactor Regulation U. S. Nuclear Regulatory Commission Washington, D. C. 20555 Attention:
Mr. A. T. Schwencer Re: Joseph M. Farley Nuclear Plant - Units 1 & 2 5 mall Break LOCA Additional Information Gentlemen:
Enclosed is additional information requested by the NRC staff during a telephone conversation January 23, 1981. This information provides clari-fication of our letter to Mr. Schwencer dated November 21, 1980 which addressed Reactor Systems Branch Question 210.2 regarding a postulated LOCA during plant startup or shutdown.
The enclosed information shows that for two inch diameter breaks and smaller, adequate time and alarms are available for the operator to initiate SI manually.
For two inch diameter breaks and larger, the containment high pressure setpoint is reached, prior to core uncovery, thereby initiating actuation of the safety injection system.
If you have any questions concerning this item, please advise.
Very truly yours, A
GA W,ny N :.'CL u & /. f' F. L. Clayton,lJr.
/
FLCJr/RWS:nac Enclosures f05j cc: Mr. R. A. Thomas j
Mr. G. F. Trowbridge Mr. E. A. Reeves (w/ Enclosure)
Mr. L. L. Kintner (w/ Enclosure)
//
Mr. W. H. Bracford (w/ Enclosure)
THIS DOCUMENT CONTAINS 81020993%
f
ENCLOSURE ALARMS:
Severci s'
~as exist which could provide inqicati-to the c' era"r that a loss deactor solant Sys' (RCS) in.'entory accider.t is undar.;s;.
These alacus include th2 foli.;ng:
1.
Low-pressurizer level deviation:
At 5% below programmed pressurizer level an alarm will sound.
For J. M. Farley Unit 2 this alarm must sound by 16.4% level, since this is 5% belovt the no-load programmed operating level of 21.4%.
2.
Low-pressurizer level heater cutoff at 15%.
SETP0lflTS:
The high containment setpoint for J. M. Farley is 5.4 PSIG.
ANALYSIS:
Based upor. the Inadequate Core Cooling Study (WCAP 9753), it can be concluded that smaller breaks will exhi!)it longer transients than larger breaks; thus there will be more time for the ;;erator to take action in a smallar break than in a larger break transient.
Calculations by Westinghouse show that a two inch diam 3ter equivalent break with no SI would resu~ft in no cora uncovery in a three loo? plant fo approximately 22 minutes.
Within the first 1.5 minutes of the tran-sient, all of the previously described alarms would have sounded leaving the oparator approximately 20 minutes to initiate SI reanually.
Calculations also show that a two inch diameter equivalent break with no SI, would result in the high containment pressure SI trip in approximate-ly 5 minutes for a three loop plant.
Thus, for breaks less than or equal to two inches in diameter, the opera-tor would have at least 20 minutes to initiate SI manually, ar J for brecks greater than or equal to two inches in diameter, a high containrent pres-sure SI trip would be reached in 5 minutes, and would provide SI automati-cally.
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