ML20099C522

Proposed Tech Specs Specifying Time Constants Utilized in Measured delta-T & Avg Temp Lag Compensations Which Are Part of Instrumentation for Overtemp & Overpower delta-T Sensing Circuitry

ML20099C522
Person / Time
Site:	Point Beach
Issue date:	11/09/1984
From:	WISCONSIN ELECTRIC POWER CO.
To:
Shared Package
ML20099C493	List: ML20099C491 ML20099C522
References
NUDOCS 8411190572
Download: ML20099C522 (2)

Text

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(c) for each percent that the magnitude of q -q exceeds -17 percent,theATtripsetpointshallbeabtomakicallyreduced by an equivalent of 2.0 percent of rated power.  !

(5) Overpower AT (1 3)

TS SAT. (K4 - K5(T5b + I 1*T b 4

where AT = indicated AT at rated power, F T = average temperature, *F T' = 574.2 F K

4 5 1.089 of rated power K

5

= 0.0262 for increasing %

0.0 for decreasing T K

6 0.00123 for T 3 T

= 0.0 for T < T' T

5

= 10 sec f (AI) as defined in (4) above, T

3

= 2 sec for Rosemont or equivalent RTD

= 0 sec for Sostman or equivalent RTD T

4

= 2 sec for Rosemont or equivalent RTD

= 0 sec for Sostman or equivalent RTD (6) Undervoltage - 375 percent of normal voltage (7) Indicated reactor coolant flow per loop - 390 percent of normal indicated loop flow (8) Reactor coolant pump motor breaker open (a) Low frequency set point 357.5 cps (b) Low voltage set point 375 percent of normal voltage.

15.2.3-3 1

gigg@[20 gQ P

.(3)*Lowpressurizerpressure- 31865 psig for operation at 2250 psia primary system pressure 31790 psig for operation at 2000 psia primary system pressure (4) OvertemperatureAT(1+fS}

3 1+T S

$ATo (K1 - K2(T(1+ 45)- )(1+T S) + K3 (P-pl) - f( AI))

where ATo = indicated AT at rated power, *F T = average temperature, F T1 = 574.2 *F P = pressurizer pressure, psig

) P2 = 2235 psig

• K y $1.117 for operation at 2250 psia primary system pressure

, $1.30 for operation at 2000 psia primary system 7ressure K = 0.0150 2

I K = 0.000791 3

T1 = 25 sec

T2 = 3 sec

) T3 = 2 sec for Rosemont or equivalent RTD

= 0 sec for Sostman or equivalent RTD T4 = 2 sec for Rosemont or equivalent RTD

= 0 sec for Sostman or equivalent RTD g

and f(AI) is an even function of the indicated difference between top and bottom detectors of the power-range nuclear ion chambers; with gains to be selected based on measured instrument response during plant startup tests, 2

where qt and qh are the percent power in the top and bottom halves of the core respectivEly, and qt + 9b is total core power in percent of rated

! power, such that:

(a) for q t

-9 b within -17, +5 percent, f(AI) = 0.

(b) for each percent that the magnitude of qt -9h exceeds +5 percent, the

AT trip set point shall be automatically redDced by an equivalent of

2.0 percent of rated power.

Appropriate safety analyses shall be performed prior to shifting j operation from one primary system pressure to the other.

l 15.2.3-2 l

l

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