ML20133K271

Forwards Info Re Recirculation Pump Trip Circuit Design,In Response to NRC 760901 Request.Tech Specs for Pump Trip Setpoints & Surveillance Requirements Contained in Specs 3.2.5 & 4.2.5

ML20133K271
Person / Time
Site:	Peach Bottom
Issue date:	10/08/1976
From:	Hankins J PECO ENERGY CO., (FORMERLY PHILADELPHIA ELECTRIC
To:	Stello V Office of Nuclear Reactor Regulation
Shared Package
ML20133K263	List: ML20133K260 ML20133K264 ML20133K271
References
NUDOCS 8510210151
Download: ML20133K271 (2)

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PHIfADELPHIA ELECTRIC COMPANY Page 2 of 2

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. Puch Bsttom Atemic Prwer Station

<, Recirculation Pump AWS Trip s'.

• A Information on recirculation pump' trip design to limit the i-consequences of an AWS event is presented in the Peach Bottom FSAR (Supplement No. 1. Answer to Question 7.1.12). Additional infornation

. on the circuit design is presented below.

Automatic recirculation pump trip is initiated by either reac' tor j i

high pressure or reactor low water level by the use of four pressure i f

switches (PS 2-3-102 A,B,C,6D) and four level switches (LIS 2-3-57A&B and LIS 2-3-58A&B), These switches are connected in a one-out-of-two logic

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~".' for both level and pressure to trip each recirculation pump MG set driva.

' '.; :, mot'or breaker. .

.i The prominent features of the design are:

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1) Reactor Protection System (RPS) scrara for high pccasure .trid i low water level is initiated by different sensors, PS 2 -

SSA,B,C,&D and LIS 2-3-101 A,B,C,6D respectively.  ; -

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N. 2) Diversity of signal sensing and processing equipment la , ;-

- . provided in the design of the recirculation p) ump trip  ;

' ~ and RPS scram. The level and pressure' sensors and the i

.  ; logic relays for recirculation pump trip were, produced j by a different manufacturer than those for RPS scram.  !

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3) Logic relays for the pump trip and RPS scram are located on different panels.

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4) The senr. hrs for pump trip and RPS scram are located on N

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the same instrument rack; however, channel separation ,

is maintained so that failure of a rack or of an instrument

~f, sensing line will not prevent, pump' trip.

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5) . Cable separation between the pump trip and RPS scram [

( .g is provided.by the use of conduit.

The pump trip circuit is shown functionally in Figure Q7.1.12.1_

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l 4 in the Peacli Bottom PSAR (Suyplement No.11 The schematic diagram for 5:- .

the circuit of one recirculation pump is shown on the attached Drawing E- M '

Sheet 1. The circuit for the other pump is identical except that PS 2 '

102B&D and LIS 2-3-57B & 58B are utilized.

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