ML20203C489

Proposed Revised Tech Specs Pages 3/4 3-12a & B 3/4 3-1a Re Reactor Trip Circuit Breaker Surveillance Interval Extension

ML20203C489
Person / Time
Site:	Waterford
Issue date:	02/05/1999
From:	ENTERGY OPERATIONS, INC.
To:
Shared Package
ML20203C478	List: ML20203C473 ML20203C489
References
NUDOCS 9902120078
Download: ML20203C489 (2)

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. . TABLE 4.3-1 (Continued)

TABLE NOTATIONS (Continued) )

(6) This CHANNEL FUNCTIONAL TEST shall include the injection of simulated process signals into the channel as close to the sensors as l practicable to verify OPERABILITY including alam and/or trip i functions.  :

(7) Above 70% of RATED THERMAL POWER, verify that the total RCS flow rate  !

as indicated by each CPC is less than or equal to the actual RCS I total flow rate determined by either using the reactor coolant pump l differential pressure instrumentation or by calorimetric calculations  !

and if necessary, adjust the CPC addressable constant flow co- I efficients such that each CPC indicated flow is le:: than or equal' to  ;

the actual flow rate. The flow measurement uncertainty is included .

in the BERR1 term in the CPC and is equal to or grei.ter than 4%.

(8) Above 70% of RATED THERMAL POWER, verify that the total RCS flow rate as indicated by each CPC is less than or equal to the actual RCS  !

total flow rate detemined by calorimetric calculations. i (9) The quarterly CHANNEL FUNCTIONAL TEST shall include verification that l the correct values of addressable constants are installed in each l OPERABLE CPC. l (10) At least once per 18 months and following maintenance or adjustment of the reactor trip breakers, the CHANNEL FUNCTIONAL TEST shall i include independent verificition of the undervoltage trip function i and the shunt trip function-

--r , - n, (11) The quarterly CHANNEL FUNCTIONAL TEST shall be scheduled and performed such  :

that the Reactor Trip Breakers (RTBs) are tested at least every 6 weeks to accommodate the appropriate vendor recommended interval for cycling of each RTB. i

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1 9902120078 990205 PDR ADOCK 05000382 j P PDR l 4

WATERFORD - UNIT 3 3/4 3-12a AMENDMENT NO.125 l l

I 3/4.3 INSTRUMENTATION BARFE 3/4 31 and 3[4 3 7 REACTOR PROTFCTIVE AND ENGINFFRED SAFETY FEATURES  ;

ACTUATION SYSTFMR INSTRUMFNTATION l

condition while another RWSP - Low channel is in bypass, the receipt of a valid Safety injection l Actuation Signal Actuation, and a coincident failure of one of the two remaining OPERABLE i RWSP - Low channels. These conditions could cause the Emergency Core Cooling System  !

and Containment Spray System suchons to be supplied from the Safety injection System Sump prematurely due to containment pressure being higher than RWSP outlet pressure and loss of l the Low Pressure Safety injection Systerra.

i When one of the inoperable channels is restored to OPERABLE status, subsequent  !

operation in the applicable MODE (S) may continue in accordance with the provisions of ACTION 19.

The Surveillance Requirements specified for these systems ensure that the overall  ;

system functional capability is maintained comparable to the original design standards. The periodic surveillance tests performed at the minimum frequencies are sufficient to demonstrate '

this capability. The quarterty frequency for the channe! functional tests for these systems comes from the analyses presented in topical report CEN-327: RPS/ESFAS Extended Test Interval Evaluation, as supplemented.

RPS\ESFAS Trip Setpoints values are determined by means of an explicit setpoint J calculation analysis. A Total Loop Uncertainty (TLU) is calculated for each RPS/ESFAS instrument channel The Trip Setpoint is then determined by adding or subtracting the TLU from the Analytical Limit (add TLU for decreasing process value; subtract TLU for increasing process value). The Allowable Value is determined by adding an allowance between the Trip Setpoint and the Analytical Limit to account for RPS/ESFAS cabinet Periodic Test Enors (PTE) which are present during a CHANNEL FUNCTIONAL TEST. PTE combines the RPS/ESFAS cabinet reference accuracy, caiibration equipment errors (M&TE), and RPS.TSFAS cabinet bistable Drift. Periodic testing assures that actual setpoints are within thew Anowable Values. A channel is inoperable if its actual setpoint is not within its Allowable Value and corrective action must be taken. Operation with'a trip set less conservative than its setpoint, but within its specified ALLOWABLE VALUE is acceptable on the basis that the difference between each trip Setpoint and the ALLOWABLE VALUE is equal to or less tnan the Periodic Test Error allowance assumed for each trip in the safety analyses.

The measurement of response time at the specified frequencies provides assurance that

, j the protective and ESF action function associated with each channelis completed within the time limit assumed in the safety analyses. No credit was taken in the analyses for those channels with response times indicated as not applicable.

1 Response time may be demonstrated by any series of sequential, overlapping, or total l

channel test measurements provided that such tests demonstrate the total channel response  ;

time as defined. Sensor response time verification may be demonstrated by either (1) in place, l onsite, or offsite test measurements or (2) utilizing replacement sensors with certified response  !

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Testing frequency for the Reactor Trip Breakers (RTBs) is described and analyzed in CEN NPSD-951. The quarterly RTB channel functional test and RPS logic channel functional test are scheduled and performed such that RTBs are venfied OPERABLE at least every 6 weeks to accommodate the '

appropriate vendor recommended interval for cycling of each RTB. l WATERFORD - UNIT 3 B 3/4 3-1a Amendment No. MS,143