ML20079L261
| ML20079L261 | |
| Person / Time | |
|---|---|
| Site: | Farley  |
| Issue date: | 02/15/1983 |
| From: | Clayton F ALABAMA POWER CO. |
| To: | Varga S Office of Nuclear Reactor Regulation |
| References | |
| RTR-NUREG-0737, RTR-NUREG-737, TASK-2.F.2, TASK-TM NUDOCS 8302230197 | |
| Download: ML20079L261 (2) | |
Text
Memng Address d
Alabama Power Company 600 North 18th Street Post Office Box 2641 Birmingham. Alabama 35291 A
Telephone 205 783-6031 F. L Clayton, Jr.
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AlabamaPbwer the southom electrc system February 15, 1983 Docket No. 50-364 Director, Nuclear Reactor Regulation U. S. Nuclear Regulatory Commission Washington, D.C.
20555 Attention:
Mr. S. A. Varga Joseph M. Farley Nuclear Plant - Unit 2 Inadequate Core Cooling Instrumentation NUREG-0737, Item II.F.2 Gentlemen:
In a letter to the NRC dated January 14, 1981 regarding NUREG-0737, Alabama Power Company described its modification to realign certain thermocouples to the upper head region as a means of indicating upper head voiding during natural circulation.
As a part of this description it was stated that two of the 16 thermo-couple inputs for the core subcooling meter were upper head thermo-couples.
Prior to the maintenance outage in February 1982, one upper head thermocouple provided input to the subcooling monitor for Unit 2.
During this outage the second upper head thermocouple was connected to the subcooling monitor.
At the subsequent refueling outage during October and November 1982, one upper head thermo-couple was disconnected from the subcooling monitor as part of an autage related activity and by mistake was not reconnected. The current installed condition at Farley Nuclear Plant Unit 2 utilizes one upper head thermocouple input to the subcooling monitor; however, four upper head thermocouples provide input to the incore thermocouple panel in the control room.
These four thermocouples provide the necessary means of monitoring voids in the reactor upper head.
In addition, the generic emergency operating procedure for natural circulation cooldown does not require upper head thermocouples to monitor reactor head voids.
During the next outage of sufficient duration but no later than the 2nd refueling f)Lffy outage for Unit 2, Alabama Power Company will implement modifications to provide two upper head thermocouple inputs to the j
subcooling monitor.
8302230197 830215 PDR ADOCK 05000364 P
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Mr. S. A. Varga Nuclear Reactor. Regulation February 15, 1983 Page 2 If you have any questions, please advise..
Yours very.truly, F.
. Clayton, Jr.
FLCJr/ JAR:mjh-D34 cc:
Mr. R. A. Thomas j.
Mr. G. F. Trowbridge Mr. J. P. O'Reilly Mr. E. A. Reeves Mr. W. H. Bradford l~
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