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

.

TABLE 2.2-1 (Continued)

$g REACTOR TRIP SYSTEM INSTRUENTATION TRIP SETPOINTS tn 7

NOTATION C

I+T S NOTE 1: Overtemperature aT 1 aT [K -K2 I

(T-T')+K (P-P') -fi (aI)]

o 1 3

1+T 8 2

where: aT = Indicated AT at RATED THERMAL POWER o

T = Average temperature, *F T' 1 577.2*F (Maximum Reference T at RATED THERMAL POWER) avg P = Pressurizer pressure, psig P' = 2235 psig (Nominal RCS operating pressure) w i

1+'18

= The function generated by the lead-lag controller for T vg dynamic 1+1 S a

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

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

sy 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 Ey (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 l

shall be automatically reduced by 1.60 percent of its value at RATED THERMAL POWER.

Nc,te 2: Overpower AT f aTo [K -K5

-K (T-T") -f2 (AI)3 4

6 3

where:

AT = Indicated AT at RATED THERMAL POWER o

T = Average temperature, *F T" = Reference T vg at RATED THERMAL POWER (Calibration temperature for AT a

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 vg dynamic compensation a

i 52 1+r S 3

Bi l

z

?

5

TABLE 2.2-1 (Continued)'

5g REACTOR TRIP SYSTEM INSTRUENTATION TRIP SETPOINTS to

'?

NOTATION C

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

T i

3 1+1 8

.g 2

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+T s y

= The function generated by the lead-lag controller for T vg dynamic a

1+1 s 2

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

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

9g K2 0.0154 K2 = NRC approval of l

2 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

TABLE 2.2-1 (Centinued)

>y REACTOR TRIP SYSTEM INSTRUENTATION TRIP SETPOINTS N

4 NOTATION continued zy (1). for qt

• 9b between -35 percent and +9 percent, ft (al) = 0 (where qt and qb are percent l

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

• Ab IS 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 -K5

-K (T-T") -f2 (AI)3 4

6 g

where:

aT = Indicated AT at RATED THERMAL POWER o

T = Average temperature, *F o

T" = Reference T vg at RATED THERMAL POWER (Calibration temperature for aT a

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 vg @namic compensation a

2 1+t S 6

5 t

8 i

i