ML20150A804

Proposed Tech Specs,Revising Trip & Alarm Setpoints for Degraded Voltage Protection

ML20150A804
Person / Time
Site:	Pilgrim
Issue date:	06/30/1988
From:	BOSTON EDISON CO.
To:
Shared Package
ML20150A802	List: BECO-88-102, Application for Amend to License DPR-35,changing Tech Spec Trip & Alarm Setpoints for Degraded Voltage Protection.Fee Will Be Transferred ML20150A804
References
NUDOCS 8807080258
Download: ML20150A804 (5)

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A'TTACHMENT B T0- BECO LETTER 88-102 Proposed Changes to Tables 3.2.8, 3.2.8.1 and Section 3.9.8.6 Affected Pages:

49 50a 53a 197 l-l l 8807080258 880630 4 l hDR ADOCK 05000293

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1 PNPS TABLE 3.2.B (Cont'd) '

INSTRUMENTATION THAT INITIATES OR CONTROLS THE CORE AND CONTAINMENT COOLING SYSTEMS

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Minimum # of Operable Instrument Channels Per Trio System (1) Trio Function Trio Level Settina Remarks 1 Core Spray Pump Start Initiates sequential starting Timer 0<t<! sec. of CSCS pumps on any auto 1 LPCI Pump Start Timer 4<t<6 sec. start.

1 LPCI Pump Start Timer 9<t<ll sec.

1 Auto Blowdown Timer 190, 1120 sec. In conjunction with Low Low Reactor Water Level, High Drywell Pressure and LPCI or Core Spray Pump running interlock, initiates Auto Blowdown.

2 ADS Drywell Pressure 11 2 min. Permits starting CS and LPCI Bypass Timer pumps and actuating ADS SRV's if RPV water level is low and drywell pressure is not high.

2 RHR (LPCI) Pump Discharge 150 10 psig Defers ADS actuation pending Pressure Interlock confirmation of Low Pressure core cooling system operation.

2 Core Spray Pump Discharge 150 1 10 psig (LPCI or Core Spray Pump Pressura Interlock running interlock.)

2 Emergency Bus Voltage 20-25% of rated 1. Permits closure of the Relay voltage resets Diesel Generator to an at less than 50% unloaded emergency bus.

2. Permits starting of CSCS 4 kV motors.

Amendment No. 40, 106, 49

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PNPS TABLE 3.2.8 (Cont'd) '

INSTRUMENTATION THAT INITIATES OR CONTROLS THE CORE AND CONTAINMENT COOLING SYSTEMS Minimum # of Operable Instrument Channels Per Trio System (1) Trio Function Trio Level Settina Remarks 2 Startup Transformer 3868V 0.5% with 1. Trips Startup Transformer l Degraded Voltage 9.2 1 0.5 seconds to Emergency Bus Breaker.

time delay

2. Locks out automatic closure of Startup i Transformer to Emergency Bus.

3. Initiates starting of Diesel Generators in-conjunction with loss of auxiliary transformer.

4. Prevents simultaneous starting of CSCS components.

5. Starts load shedding logic

for Diesel Operation in conjuction with a) Low Low Reactor Hater Level and Low Reactor Pressure or

b) High drywell pressure or c) Core Standby Cooling System 4

components in service in conjuction with Auxiliary Transformer breaker open.

l Amendment No. 42, 67, 108 50a

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1 PNPS TABLE 3.2.B.1 -

INSTRUMENTATION THAT MONITORS _,~NERGENCY BUS VOLTAGE Minimum # of Operable Instrument Channels Per Trio System Function Settina Remarks 1 Emergency 4160V Buses AS 3959V 0.5% with Alerts Operator to possible l

& A6 Degraded Voltage 9.2 0.5 seconds degradad voltage conditions.

Annunication (1) time delay Provides permissive to initiate load shedding in conjunction with LOCA signal.

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(1) In the event that the alarm system is determined inoperable, commence logging safety related bus voltage every 1/2 hour until such time as the alarm is restored to operable status.

Amendment No. 42, 67. 108, 53a i

L1HITING CONDITION FOR OPERATION SURVEILLANCE REOUIREMENTS 3.9.8 Ooeration with Inocerable Equioment following conditions are satisfied:

a. The sts.rtup transformer and both offsite 345 kV transmission lines are available and capable of automatically supplying auxillary power to the emergency 4160 volt buses.

b. A trinsmission line and associated shutdown transformer are available and capable of automatically supplying auxiliary power to the emergency 4160 volt buses.

5. From and after the date that one of the 125 or 250 volt battery systems is made or fc!1nd to be inoperable for any reason, continued reactor operation is permissible during the succeeding three -

days within electrical safety considerations, provided repair work is initiated in the most expeditious manner to return the failed component to an operable state, and Specification 3.5.F is satisfied.

6. Hith the emergency bus voltage l less than 3959V but above 3868V (excluding transients) during normal operation, transfer the safety related buses to the diesel generators. If grid I voltage continues to degrade be in at least Hot Shutdown I

within the next 4 hours4.62963e-5 days <br />0.00111 hours <br />6.613757e-6 weeks <br />1.522e-6 months <br /> and in i

Cold Shutdown within the l following 12 hours1.388889e-4 days <br />0.00333 hours <br />1.984127e-5 weeks <br />4.566e-6 months <br /> unless the j grid conditions improve.

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l Amendment No. 42, 67, 88, 197 l

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