ML19256G138

Proposed Tech Spec Page 15.2.3-2 Reflecting Mod to Tech Spec Change Request 60.Provides Addl Operating Margin Between Proposed Primary Sys Pressure & Low Pressurizer Reactor Trip Setpoint

ML19256G138
Person / Time
Site:	Point Beach
Issue date:	12/21/1979
From:	WISCONSIN ELECTRIC POWER CO.
To:
Shared Package
ML19256G130	List: ML19256G129 ML19256G138
References
NUDOCS 7912270499
Download: ML19256G138 (1)

Text

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(3)~ Low pressurizer pressure -~ ~ ~ ~ ~

t 1865 psig for operation at 2250 psia primary system pressure L 1790 psig for operation at 2000 psia primary system pressure

.(4) Overtemperature AT _ _ __ _

1aTo [K1 - K2(T-T') ( +K3 (P-P') - f(aI)]

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

P = pressurizer pressure, psig P' = 2235 psig K) 1 1.117 for operation at 2250 psia primary system pressure 1 1.30 for operation at 2000 psia primary system pressure K2 = 0.0150 .

K3 = 0.000791

= 25 see t) t 2

= 3 sec and f(aI) is an even function of the indicated difference between top and bottom detect 7rs of the power-range nuclear ion chambers; with gains to '..e selected based on measured instrument response during plant startup tests, where qt and qbare the precent 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 qt -9 b w n- , +9 percent, f(aI) = 0.

(b) for each percent that the magnitude of qt - 9b exceeds +9 percent the AT trip set point shall be automatically reduced by an equivalent of two percent of rated power.

~

1654 074 15.2.3-2 7912270

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