ML20087A402

Corrected Tech Spec Pages for Moderator Temp Coefficient at Low Power Levels

ML20087A402
Person / Time
Site:	Farley
Issue date:	03/02/1984
From:	ALABAMA POWER CO.
To:
Shared Package
ML20087A387	List: ML20087A383 ML20087A402
References
TAC-52565, TAC-52566, NUDOCS 8403080086
Download: ML20087A402 (4)

Text

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TABLE 2.2-1 (Continued) g REACTOR TRIP SYSTEM INSTRUENTATION TRIP SETPOINTS -

tn 7 NOTATION C

NOTE 1: Overtemperature aT 1 aTo[K1-K2 I+TIS (T-T')+K 3 (P-P') -fi (aI)]

1+T28 where: aT =oIndicated AT at RATED THERMAL POWER T = Average temperature, *F T' 1 577.2*F (Maximum Reference T avg at RATED THERMAL POWER)

P = Pressurizer pressure, psig P' = 2235 psig (Nominal RCS operating pressure) w '

i 1+'18 1+1 S = The function generated by the lead-lag controller for T vg compensation a dynamic 2

T1 & T 2 = Time constants utilized in the lead-lag controller for T vg a T1 = 30 secs, T 2 = 4 secs.

S = Laplace transform operator, sec-1 Operation with 3 Loops Operation with 2 Loops Ki = 1.22 K1 = (values blank pending l hK2 = 0.0154 K2 = NRC approval of l s

y K3 = 0.000635 K3 = 2 loop operation) l and ft ( AI) is a 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 3 tests such that:

8403080086 840302 gDRADOCK 05000348 PDR

. TABLE 2.2-1 (Ccntinued)

p p REACTOR TRIP SYSTEM INSTRUENTATION TRIP SETPOINTS to 7 NOTATION continued E

y (1) for qt

• Ab between -35 percent and +9 percent. . fi (al) = 0 (where qt and qb are percent l 1

RATED THERMAL POWER'in the top and bottom halves of the core respectively, and qt

• Ab 15 total THERMAL POWER in percent of RATED THERMAL POWER).

(ii)- for each percent that the magnitude of (qt - Ab) exceeds -35 percent, the a T trip setpoint l shall be automatically reduced by 1.37 percent of its value at RATED THERMAL POWER. J (iii) for each percent that the magnitude of (qt - 9b) exceeds +9 percent, the aT trip setpoint shall be automatically reduced by 1.60 percent of its value at RATED THERMAL POWER.

l Nc,te 2: Overpower AT f aTo [K4-K5 3-K6 (T-T") -f2 (AI)3 where: ATo = Indicated AT at RATED THERMAL POWER T = Average temperature, *F T" = Reference T vga at RATED THERMAL POWER (Calibration temperature for AT instrumentation, 3 577.2*F) l K4 = 1.08 l K5 = 0.02/*F for increasing average temperature and 0 for decreasing average temperature l K6 = 0.00109/*F for T > T"; K6 = 0 for T 1 T" l 2 s T3

$ = The function generated by the rate lag controller for T vga dynamic compensation i 52 1+r S  ;

3 Bi l z

?

5

TABLE 2.2-1 (Continued)'

5 g REACTOR TRIP SYSTEM INSTRUENTATION TRIP SETPOINTS to

'? NOTATION C

NOTE 1: Overtemperature AT 1 A T o[K i -K2 1+'1S (T-T')+K3 (P-P') -fi (al)]

.g 1+128 where: ATo = Indicated AT at RATED THERMAL POWER T. = Average temperature, 'F T' 1577.2*F (Manimum Reference Tavg at RATED THERMAL POWER) l P = Pressurizer pressure, psig l l

P' = 2235 psig (Nominal RCS operating pressure) l u 1 lo 1+Ty s 1+1 2 s = The function generated by the lead-lag controller for T vg compensation a dynamic T1 & T 2 = Time constants utilized in the lead-lag controller for T vg a T1 = 30 secs, T2 = 4 secs.

S = Laplace transform operator, sec-I.

Operation with 3 Loops Operation with 2 Loops

$Ki = 1.22 K1 = (values blank pending l 9

g K2 2

0.0154 K2 = NRC approval of l R

Q K3 = 0.000635 K3 = 2 loop operation) l 5 and ft (al) is a 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 w tests such that:

1 o

>y TABLE 2.2-1 (Centinued)

@ REACTOR TRIP SYSTEM INSTRUENTATION TRIP SETPOINTS N

4 NOTATION continued z

y (1). for qt

• 9b between -35 percent and +9 percent, ft (al) = 0 (where qt and qb are percent RATED THERMAL POWER in the top and bottom halves of the core respectively, and qt

• Ab IS l total THERMAL POWER in percent of RATED THERMAL POWER).

(ii) for each percent that the magnitude of (qt - 9b) exceeds -35 percent, the AT trip setpoint l shall be automatically reduced by 1.37 percent of its value at RATED THERMAL POWER.

(iii) for each percent that the magnitude of (qt

• Ab) exceeds +9 percent, the aT trip setpoint shall be automatically reduced by 1.60 percent of its value at RATED THERMAL POWER.

Note 2: Overpower aT < aTo [K 4-K5 g-K6 (T-T") -f2 (AI)3 where: aTo= Indicated AT at RATED THERMAL POWER o T = Average temperature, *F T" = Reference T vg a at RATED THERMAL POWER (Calibration temperature for aT instrumentation,1577.2*F)

K4 = 1.08 l K5 = 0.02/*F for increasing average temperature and 0 for decreasing average temperature K6 = 0.00109/*F for T > T"; K6 = 0 for T 1 T" l a S g T3

= The function generated by the rate lag controller for T vga @namic compensation 2 1+t S 6

5 t 8 i

i