ML20205H167

Revised Tech Specs Bases Page B 3/4 3-3 Re ESFAS Interlocks

ML20205H167
Person / Time
Site:	Byron, Braidwood, 05000000
Issue date:	10/24/1988
From:	COMMONWEALTH EDISON CO.
To:
Shared Package
ML20205H147	List: ML20205H143 ML20205H167
References
NUDOCS 8810280406
Download: ML20205H167 (3)

Text

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ATTAC1902fLA CHANGES TO TECHNICAL SPECITICATICH BASES Revised _Peges Byron.Stallon Ital.dvooLStation I

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Se.tpoin+ [w% valves T:W 078 A, T3, C anci D INSTRUMENTATION n s+a 11 Q BASES Engineered Safety Features Actuation System Interlocks The Engineered Safety Features Actuation System interlocks perform the following functions:

P-4 Reactor tripped - Actuates Turbine trip, closes main feedwater valves belw=$vtpetMf prevents the opening of the main feedwater valves which were closed by a Safety Injection or High Steam Generator Water Level signal, allows Safety Injection block so that components can be reset or tripped.

Reactor not tripped prevents manual block of Safety Injection.

P-11 On increasing pressure P-11 automatically reinstates Safety Injection actuation on low pressurizer pressure and low steamline pressure and automatically blocks steamline isolation on negative steamline pressure rate. On decreasing pressure; P-11 allows the manual block of Safety Injection low pressurizer pressure and low steamline pressure and allows steamline isolation on negative steamline pressure rate to become active upon manual block of low steamline pressure SI.

P-12 On increasing reactor coolant loop temperature, P-12 automatically provides an aming signal to the Steam Dump System. On decreasing reactor coolant loop temperature, P-12 automatically removes the aming signal Nom the Steam Dump System.

P-14 /.n increasing steam generator water level, P-14 automatically trips all feedwater isolation valves and inhibits feedsater control valve modulation.

3/4.3.3 MONITORING INSTRUMENTATION 3/4.3.3.1 RADIATION MONITORING FOR PLANT OPERATIONS The OPERABILITY of the radiation monitoring instrumentation for plant operations ensures that: (1) the associtted action will be initiated when the radiation level monitored by each channel reaches its Setpoint and (2) suffi-cient redundancy is maintained to pemit a channel to be out-of-service for testing or maintenance. The radiation monitors for plant operations senses radiation levels in selected plant systems and locations and detemines whether or not predetermined limits are being exceeded. If they are, the system sends actuation signals to initiate alams and automatic act.uation of Emergency Exhaust or Ver.tilation Systems. The radiation monitor Setpoints given in the requirements art assumed to be values established above nomal background radiation le'els for the particular area. Radiation monitors ORE-AR055 and 56 serve a d.a' purpose for plant operations as criticality and fuel handling accident <e isors. Although these monitors are designed primarily to detect fuel handling accident releases, they are capable of detecting an inadvertent criticality incident. The Setpoint given in the requirement is established for the fuel handling building isolation function but is also adequate for an inadvertent criticality.

BYRON - UNITS 1 & 2 B 3/4 3-3 ammsm ,

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A C o4/ a ,h5 rg//dj BASES Engineered Safety Features Actuation System Interlocks The Engineered Safety Features Actuation System interlocks perform the following functions:

P-4 Reactor tripped - Actuates Turbine trip, closes main feedwater /

valves r Q :1:w Sctp ti prevents the opening of the main feedwater valves which were closed by a Safety Injection or High Steam Generator Water Level signal, allows Safety Injection block so that components can be reset or tripped.

Reactor not tripped prevents manual block of Safety Injection.

P-11 On incrusing pressure, P-11 automatically reinstates Safety Injection actuation on low pressurizer pressure and low steamline pressure and automatically blocks steamline isolation on negative steamline pressure rate. On decreasing pressure, P-11 allows the manual block of Safety Injection low pressurizer pressure and low steamline pressure and allows steamline isolation on negative steamline pressure nte to become active upon manual block of low steamline pressure SI.

P-12 On increasing reactor coolant loop temperature, P-12 automatically provides an arming signal to the Steae Oump System. On decreasing

- reactor coolant loop temperature, P-12 automatically removes the arming signal from the steam Dump Systnm.

P-14 An increasing steam generator water level, P-14 automatically trips all feedwater isolation valves and inhibits feedwater control valve modulation.

3/4.3.3 MONITORING INSTRUMENTATION 3/4.3.3.1 RADIATION HONITORING FOR PLANT OPERATIONS The OPERABILITY of the radiation monitoring instrun qtation for plant operations ensures that: (1) the associated action will be initiated when the radiation level monitored by ear.h channel reaches its Setpoint and (2) suffi-cient redundancy is maintained to permit a channel to be out-of-service for testing or maintenance. The radiation monitors for plant operations senses radiation levels in selected plant systems and locations and determines whether or not predetermined limits are being exceeded. If they are, tne system sends actuation signals to initiate alarms and automatic actuation of Emergency Exhaust or Ventilation Systems. The radiation monitor Setpoints given in the requirements are assumed to be values established above normal backgrourd radiation levels for the particular area. Radiation monitors ORE-AR055 and 56 serve a dual purpose for plant operations as criticality and fuel handling i accident sensors. Although these monitors are designed primarily to detect fuel handling accident releases, they are capable of detecting an inadvertent criticality incident. The Setpoint given in thir requirement is established for the fuel handling building isolation function but is also adequate for an inadvertent criticality, BRAIDWOOD - UNITS 1 & 2 8 3/4 3-3 j

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