ML20205M137

Notifies of Present Configuration of Emergency Notification Sys (ENS) Power Sources.Brief History of Requirements for ENS Power Supply,Description of Current Sys & Justification for Sys Adequacy Provided

ML20205M137
Person / Time
Site:	Farley
Issue date:	04/08/1986
From:	Mcdonald R ALABAMA POWER CO.
To:	Rubenstein L Office of Nuclear Reactor Regulation
Shared Package
ML20205M142	List: ML20205M137 ML20205M148
References
IEB-80-15, NUDOCS 8604150101
Download: ML20205M137 (3)

Text

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• Mailing Addroos Alabama Power Company 600 North 18th Street Post Of fice Box 2641 Birmingham. Alabama 35291 Telephone 205 783-6090 R. P. Mcdonald Senior Vice President Fhntndge Building Alabama POWCf April 8, 1986 Docket Nos. 50-348 50-364 Director, Nuclear Reactor Regulation U. S. Nuclear Regulatory Commission Washington, D.C. 20555 Attention: Mr. L. S. Rubenstein Gentlemen:

Joseph M. Farley Nuclear Plant - Units 1 and 2 Power Source Requirements for the Emergency Notification System The purpose of this letter is to notify the NRC of the present configuration of the Emergency Notification System (ENS) power sources at Farley Nuclear Plant. The following provides a brief history of the requirements for the ENS power supply followed by a description of the Farley system as it currently exists with a justification for its adequacy.

Background

IE Bulletin No. (IEB) 80-15 was issued by the NRC on June 18, 1980. This bulletin classifies 'all nuclear facilities into two groups and provides a description of the ENS power source requirements for the two classifications. The two groups listed are those facilities that have an ENS powered by the local telephone company or those facilities with an ENS using onsite power. For those facilities that have an ENS that utilizes onsite power, the NRC requires that battery backup power is availabl e. In this bulletin, the NRC listed Farley 1 in the group having an ENS using onsite power.

By letter dated August 6,1980 Alabama Power Company responded to the NRC regarding IEB 80-15. In this letter it was pointed out that the Farley 1 ENS is powered by offsite power with offsite backup battery packs; therefore, no action was necessary.

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Mr. L. S. Rubenstein April 8, 1986 U. S. Nuclear Regulatory Commission Page 2 In another NRC letter dated June 29, 1981 (enclosed), the NRC requested that each licensed activity site provide Region II the needed information and support for installing the upgraded ENS which the NRC developed in conjunction with American Telephone and Telegraph. Alabama Power Company was requested to supply power for the station packages. One criterion which was specified by the NRC was that the upgraded equipment cannot be powered at any licensed facility by the local telephone company but nust be supplied by onsite power.

Present Configuration In order to accomodate the NRC's June 29, 1981 request for support of the ENS upgrade, a design change was implemented. The existing ENS is supplied by regulated distribution panel IB which is regulated by a Solatron regulator. This panel is in turn supplied by a breaker located in class 1E motor control center (MCC) 18. The panel that provides power to the ENS does not have battery backup capability.

Justification Even though the panel that supplies the ENS is not backed by batteries, there are sufficient sources of alternative power feeds to the panel to ensure that communication could be maintained during a loss of offsite power event. As stated above, the ENS is powered from MCC 18. Normal supply for MCC IB is from start-up auxiliary transformer 18. At the beginning of an accident the priority is placed on ensuring that one train of ESF equipment is energized. If Train B is de-energized, other priorities may result in Train B being de-energized for a period of time. There are three possible alternative feeds for MCC IB if start-up auxiliary transformer 1B were to be out of service: 1) in the case of a loss of train B power, MCC IB would be automatically switched to feed from diesel generator 1B; 2) if diesel generator IB were to fail, then the bus that supplies MCC 1B could be switched to start-up auxiliary transformer 1A; 3) depending upon the condition of the plant, the >lant operators have the option of switching to diesel generator 2C in the event of a total loss of offsite power and a failed diesel generator 18.

Although procedural guidance does not specify that operators perform itens two and three above in the event that start-up transformer 1B becomes unavailable, these are alternatives that are available to the opera tor. For each of the four independent modes of supply for MCC IB (start-up auxiliary transformers 1A and 18 and diesel generators 18 and 2C), there are two separate parallel paths for feeding 600Y load center IE which supplies MCC IB: from 4.16KV bus 1G or from load center 1F.

In addition, the Emergency Plan Implementing Procedure states, "If the ENS is not functional, notify NRC Headquarters by connercial telephone."

Mr. L. S. Rubenstein April 8,1986 U. S. Nuclear Regulatory Commission Page 3 Conclusion The ENS power is supplied from a distribution panel which is fed from a class 1E MCC. This provides a reliable source of power since, in the event of a loss of offsite power, this load is picked up by the diesel generators. Alabama Power Company believes that the ENS is supplied by a reliable power source and has the necessary contingency power supplies to meet the intent of the NRC's guidance.

If you have any questions, please advise.

Respectfully submitted, ALABAMA POWER C PA 4

fd[! [w R. P. Mcdonald RPM /BHW: dst-D50 Enclosure cc: Mr. L. B. Long Dr. J. N. Grace Mr. E. A. Reeves Mr. W. H. Bradford