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 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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2) Diversity of signal sensing and processing equipment la provided in the design of the recirculation p) ump trip

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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

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on different panels.

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

the same instrument rack; however, channel separation

~f, is maintained so that failure of a rack or of an instrument sensing line will not prevent, pump' trip.

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

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(.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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in the Peacli Bottom PSAR (Suyplement No.11 The schematic diagram for 4

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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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