ML20112A189

Discusses Emergency Operations Facility Power Supply.Backup Emergency Operation Facility Being Equipped & Readied to Provide Continuation of Key Functions.Power Supply Meets Requirements of NUREG-0737,Suppl 1

ML20112A189
Person / Time
Site:	Clinton
Issue date:	03/14/1985
From:	Spangenberg F ILLINOIS POWER CO.
To:	Schwencer A Office of Nuclear Reactor Regulation
References
RTR-NUREG-0737, RTR-NUREG-737 U-0809, U-809, NUDOCS 8503180200
Download: ML20112A189 (3)

Text

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/LLIN0/8 POWER OOMPANY CLINTON POMR STATION, P.o. BOX 678. CLINTON, ILLINOIS 61727 March 14, 1985 Docket No. 50-461

-Director of Nuclear Reactor Regulation Attention: Mr. A. Schwencer, Chief Licensing Branch No. 2 Division of Licensing U.S. Nuclear Regulatory Commission Washington, D.C._20555

Subject:

Clinton Power Station Unit i Emergency Operations Facility Power Supply

Dear Mr. Schwencer:

Clinton Power Station (CPS) Emergency Plan Revision 4. Section 3.1.4.7, indicates that all communications, instrumentation, data system equipment, HVAC, and lighting located in the primary Emergency Operations Facility (EOF) and vital to the functioning of the facility will be supplied from the 138kV offsite source to the CPS.

As discussed in CPS Final Safety Analysis Report (FSAR), Sections 8.1.2.1, 8.'2.1.1, and 8.2.2, the 138kV offsite power system provides power to CPS by one three-terminal transmissicn line (see attached.

sketch). This line connects CPS to the 1111ncis Power Company (IPC) grid at the South Bloomington and Clinton Route 54 substations.

Electrical power can be fed to CPS through this line from South Bloomington or North Decatur (via Clinton Route 54 Substation) or both.

The 138kV line from Decatur tarminates at a circuit breaker at Clinton

.Rt 54 Substation, approximately 6.5 miles west of CPS. A circuit switcher is located between tte Clinton Plant 138kV line tap and Bloomington Substation. If the Decatur-Bloomington line is faulted, relays will automatically operate the circuit breaker or circuit switcher as necessary to isolate the fault anc maintain a 138kV source to the Clinton Plant.

The 138kV line is connected to a 138kV to 12kV transformer, which is in turn connected via circuit breakers to a 12kV above ground / underground-loop that encircles the CPS site (see attached sketch). This loop is connected to a 12kV to 480V transformer that provides electrical service to the EOF. The 12kV loop has the ability to be sectionalized to isolate a fault should one occur.

Based on a review of the EOF power supply records, the EOF power supply availability has been as follows:

Year Availability 1980 99.55%

1981 99.94%

1982 99.88% Og 1983 99.65% O B5j31eO g % g F

-e 41 IF0809 L30585(03-14)-L 1A.120 The Illinois Power Company has designated an area of the company-owned Dispatch Center in Decatur, Illinois, to serve as the back-up to the CPS EOF should the EOF become uninhabitable for any reason, including EOF power failure. The Back-up Emergency Operations Facility (BEOF), which is approximately 21 air miles and a 35 minute drive from the. site, is currently.being equipped and readied to provide continuation of key EOF functions, for example, offsite dose projections, communications with onsite and offsite personnel and agencies, and decision making.

Based on the above information IPC believes that the EOF power supply is reliable and meets the requirements of NUREG-0737, Supplement

1. If you should have any questions regarding the EOF power supply, please contact me.

Sincerely yours,

/f T:'. . #N F. A. and nber Director - liuclear Licensing and Configuration Nuclear Station Engineering TLG/1s cc: B.L. Siegel, NRC Clinton Licensing Project Manager NRC Resident Office

, Regional Administrator, Region III, USNRC

, Illinois Department of Nuclear Safety l

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