ML19256G138
| ML19256G138 | |
| Person / Time | |
|---|---|
| Site: | Point Beach  |
| Issue date: | 12/21/1979 |
| From: | WISCONSIN ELECTRIC POWER CO. |
| To: | |
| Shared Package | |
| ML19256G130 | List: |
| 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)
= 3 sec t2 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 q are the precent power in the top and bottom halves of the b
core respectively, and qt + 9b is total core power in percent of rated power, such that:
(a) for qt -9 w
n-
, +9 percent, f(aI) = 0.
b (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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