ML18093A174

Forwards Rept Re Installation of trip-a-unit Protection Sys to Increase Electrical Output During Extended Outage of Keeney 500 Kv Circuit.Power Sys Stabilizers Would Enhance Damping of post-contingency Oscillations

ML18093A174
Person / Time
Site:	Salem, Hope Creek, 05000000
Issue date:	06/19/1987
From:	Miltenberger S Public Service Enterprise Group
To:	NRC OFFICE OF ADMINISTRATION & RESOURCES MANAGEMENT (ARM)
Shared Package
ML18093A175	List: ML18093A174 ML18093A179
References
NLR-N87114, NUDOCS 8706260030
Download: ML18093A174 (4)

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Public Service Electric and Gas Company Steven E. Miltenberger Public Service Electric and Gas Company P.O. Box 236, Hancocks Bridge, NJ 08038 609 339-4199 Vice President -

Nuclear Operations June 19, 1987 NLR-N87114 United States Nuclear Regulatory Commission Document Control Desk Washington, DC 20555 Gentlemen:

INSTALLATION OF TRIP-A-UNIT PROTECTION SCHEME SUPPLEMENTAL INFORMATION SALEM AND HOPE CREEK GENERATING STATIONS DOCKET NOS. 50-272, 50-311 AND 50-354 Public Service Electric and Gas Company (PSE&G) hereby transmits

-the attached information relative to the operation of the Salem and Hope Creek Generating Stations during the extended outage of the Hope Creek - Keeney 500 KV circuit. Subsequent to our submittal of April 3, 1987, additional analyses were completed to support increased electrical output from the Salem and Hope Creek Stations. These increases will be obtained through the installation of a Trip-A-Unit system on Salem Unit No. 2, and by activation of the Power System Stabilizers presently installed on Salem Unit No. 2 and Hope Creek Unit No. 1. Each of these items has been addressed in the attached Safety Evaluation (Attachment 1). Also attached are the revised Operating Instructions (Attachments 2 and 3) OI 7-B-04 and 7-B-05 to be used by the System Load Dispatcher, and the revised operating guides (Attachment 4) to be used by the Station Operators. A brief summary of the benefits derived from these changes is given in the following paragraphs.

Salem Unit No. 2 Trip-A-Unit System The installation of a Trip-A-Unit protection system on Salem Unit No. 2 provides additional operational flexibility whenever one of the two Salem Units is out of service.

During 2 unit operation (i.e., Hope Creek Unit No. 1 and either Salem unit) with Trip-A-Unit activated on the operating Salem unit, full electrical output would be achievable from both Units. Additionally, when Salem Unit

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Document Control Desk 2 6/19/87 No. 2 is selected as the Trip-A-Unit, a more favorable configuration in the arrangement of the offsite power sources exists following the worse case scenario for a line fault with delayed clearing. As a result, Salem Unit No. 2 will be designated as the preferred Unit for Trip-A-Unit protection.

Power System Stabilizers Power System Stabilizers are generally utilized by generating stations which are remotely located from their major load centers. The purpose of the Power System Stabilizer is to enhance the damping of post-contingency oscillations.

Because of the relatively direct connection provided by the Hope Creek - Keeney line, the stabilizers installed on Salem Unit No. 2 and Hope Creek had not previously been activated.

With the extended outage of the Hope Creek - Keeney line, the activation of the Stabilizers will provide a greater margin of system stability. Due to the increased damping available during Stabilizer operation, an additional 100 Mw (combined Unit total) can be obtained during 3 unit operation with Salem Unit No. 2 Trip-A-Unit system operating or, if Trip-A-Unit is disabled, an additional 150 Mw (combined unit total) can be achieved.

In addition to the above, the electrical output limits applicable to all combinations of unit operation have been redefined to provide additional operating flexibility. The new limits are expressed both as an individual unit limit and a combined unit total. This allows the output of one unit to be increased to make up for a reduction in output on another unit. This balancing of outputs would only be performed for Hope Creek Unit No. 1 and the Salem Unit not designated as the Trip-A-Unit. The new limitations are given below. A summary of all operating limitations are given in Attachment 1.

Document Control Desk 3 6/19/87 TRIP -A- UNIT SALEM UNIT 1 SALEM UNIT 2 NONE s SALEM 1: 1162 MW SALEM 2: 1162 MW SALEM 1: 910 SALEM 2: 910 T 0 SALEM 2: VARIABLE SALEM 1: VARIABLE HOPE CREEK: 870 HC . VARIABLE HC . VARIABLE A F COMBINED 2000 MW COMBINED 2000 MW B F COMBINED 3 UNIT COMBINED 3 UNIT COMBINED 3 UNIT OUTPUT NOT TO OUTPUT NOT TO OUTPUT NOT TO I EXCEED 3162 MW EXCEED 3162 MW EXCEED 2330 MW L

SALEM 1: 1162 SALEM 2: 1162 SALEM 1: 910 I SALEM 2: 910 SALEM 2: VARIABLE SALEM 1: VARIABLE HOPE CREEK: 870 z 0 HC . VARIABLE HC . VARIABLE COMBINED 2000 MW COMBINED 2100 MW E N COMBINED 3 UNIT COMBINED 3 UNIT COMBINED 3 UNIT R OUTPUT NOT TO OUTPUT NOT TO TOTAL NOT TO EXCEED 3162 MW EXCEED 3262 MW EXCEED 2480 MW s

We trust this information will be useful to your ongoing review of these matters. Should there be any questions relative to any of this information, please feel free to contact us.

Sincerely, Attachment

Document Control Desk 4 6/19/87 C Mr. G. W. Rivenbark USNRC Licensing Project Manager - Hope Creek Mr. R. w. Borchardt USNRC Senior Resident Inspector - Hope Creek Mr. D. C. Fischer USNRC Licensing Project Manager - Salem Mr. T. J. Kenny USNRC Senior Resident Inspector - Salem Mr. D. M. Scott, Chief Bureau of Nuclear Engineering Department of Environmental Protection 380 Scotch Road Trenton, NJ 08628

o. Chopra

u. s. Nuclear Regulatory Commission Off ice of Nuclear Reactor Regulation Washington, DC 20555 L. Bettenhausen USNRC Region I 631 Park Avenue King of Prussia, PA