ML18092B493

Provides Addl Info on Listed Items 1 & 2 Concerning Power Level Restrictions & Conditions Re Artificial Units When trip-a-unit Energized or Deenergized,Per NRC 870327 Meeting Request to Clarify Util 870325 SER

ML18092B493
Person / Time
Site:	Salem, Hope Creek, 05000000
Issue date:	03/30/1987
From:	Corbin McNeil Public Service Enterprise Group
To:	NRC OFFICE OF INFORMATION RESOURCES MANAGEMENT (IRM)
References
NLR-N87057, NUDOCS 8704070033
Download: ML18092B493 (3)

Text

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Public Service Electric and Gas Company Corbin A. McNeil!, Jr. Public Service Electric and Gas Company P.O. Box 236, H ancocks Bridge, NJ 08038 609 339-4800 Vice President -

Nuclear MAR 3 Q, *l987 NLR-N87057

u. s. Nuclear Regulatory Commission Document Control Desk Washington, D. C. 20555 Gentlemen; INSTALLATION OF TRIP-A-UNIT PROTECTION SCHEME SALEM AND HOPE CREEK GENERATING STATIONS DOCKET NOS. 50-272, 50-311, AND 50-354 On March 25, 1987 Public Service Electric and Gas Company (PSE&G) forwarded for your review, a copy of its Safety Evaluation for the installation of a Trip-A-Unit protective relay scheme for Salem Unit No. 1. This protection is requirea as a result of the loss of the Hope Creek Keeney 500 kV circuit. With the trip-a-unit relay protection, Salem Unit No.l will be automatically tripped for a fault on the Salem - Deans circuit.

This feature will ensure that all Units at our Artificial Island facility remain stable following a loss of the Salem - Deans 500 kV circuit with all Island generation at 3162 MW. A discussion of the general requirements for system and unit stability had been presented to representatives of your staff during a March 10, 1987 meeting, at Salem Generating Station.

In response to questions received from your staff, PSE&G representatives attended a meeting in your offices on March 27, 1987 to clarify information provided in the Safety Evaluation. At the close of that meeting, PSE&G committed to provide additional information relative to the following:

1) Power level restrictions applicable to all Artificial Island Units when the trip-a-unit scheme is either energi~ed or deenergized.

2) Conditions during which the trip-a-unit scheme would be energized and deenergized.

3) The availability of offsite power upon failure of the trip-a-unit scheme and subsequent loss of all Island Units when the Island is at 3162 MW.

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NRC Document Control Desk 2 MAR 3 o 1S8'1

4) The availability of offsite power following a failure of the trip-a-unit scheme and subsequent loss of all Island Units with the Island at maximum generating capacity.

5) The minimum expected voltage following the loss of all Artificial Island Units and the Salem - Deans circuit.

6) The voltage profile at the 4160v vital busses following the loss of all Units and the Salem - Deans circuit.

Items 1 and 2 are addressed in the following paragraphs. Items 3 through 6 will be addressed in a revised Safety Evaluation which will be forwarded by April 3, 1987.

Generating Limits.

Generating limits based on Stability considerations have been established for each of the Artificial Island Uni ts.

These limits are as follows:

CONDITION SALEM 1 SALEM 2 HOPE CREEK Trip-A-Unit Available 1162 1000 1000 Trip-A-Unit Unavailable 790 790 750 One Transmission Line Out 650 650 650 Of Service Additibnally, with one Unit out of service, the remaining Units may be operated at maximum capacity with the trip-a-unit scheme disabled.

Trip-A-Unit Operation As indicated above, an Island generation limit of 2330 MW is imposed when the trip-a-unit scheme is unavailable. Further, power shall be reduced to this limit and trip-a-unit shall be disabled whenever any one of the following conditions exist;

- Severe thunderstorm and/or lightning activity within 50 miles of Salem.

- Severe icing conditions.

MAR 3 0 1987 NRC Document Control Desk 3

- Winds in excess of 50 mph as measured at either Camden or Deans switching stations or at Artificial Island.

- Whenever forest fires are reported in the vicinity of the Salem/Deans right-of-way.

- Required maintenance work.

Appropriate revisions have been made to the Salem And Hope Creek operating procedures to incorporate the above requirements and limitations.

We trust that the above information will be useful in your review of this matter. If there are any further questions, please feel free to contact us.

Sincerely, C: Mr. Donald c. Fischer Project Manager - Salem Mr. David Wagner Project Manager - Hope Creek Mr. Thomas J. Kenny Senior Resident Inspector - Salem Mr. Robert w. Borchardt Senior Resident Inspector - Hope Creek