ML20212C388

Proposed Tech Specs Re Revised Core Safety Limit Curves & Revised Overtemperature N-16 Reactor Trip Setpoints

ML20212C388
Person / Time
Site:	Comanche Peak
Issue date:	10/24/1997
From:	TEXAS UTILITIES ELECTRIC CO. (TU ELECTRIC)
To:
Shared Package
ML20212C386	List: ML20212C380 ML20212C388
References
NUDOCS 9710290215
Download: ML20212C388 (6)

Text

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i ATTACHMENT 3 to TXX 97228

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AFFECTED TECHNICAL SPECIFICATION PAGES (Figure 2.1 la and Table 2.21)

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' to TXX 97228 Page 1 of 5 Uniti Reactor Core Safety Umits r

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gg Operation j i

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.go P=

poig 640 x,

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5 psig iN

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i A-:-:+;-t=% l OperstL:n i soo g

0 20 40 60 80 100 ~

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=

Percent of Rated Thermal Power

.j FIGURE 2.1-la Unit 1 REACTOR CORE SAFETY LIMITS J

COMANCHE PEAK UNITS 1 AND 2 22 Unit 1 - Amendment No, Mat 52 Unit 2 Amendment No. 7.38

ttachment 3 to TXX 97228 Page 2 of 5 670 660 Unacceptable 650 Operation 3

P = 2385 psig 640 l

P = 2235 psig 5

o 630 h

A 620

-P = 1985 psig O

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610

_p, 3 845 psig _

l 600 Acceptable l

Operation 590.

580 0

20 40 60 30 100 120 Forcent of Rated Thermal Power FIGURE 2.1 la Unit 1 REACTOR CORE SAFETY LIMITS COMANCHE PEAK - UNITS 1 AND 2 22 Unit 1 Amendment No.14-M.52 Unit 2 - Amendment No. 7.38

_ _ _ to TXX-97228 Page 3 of 5 TABLE 2.2-1 (Continued)

TABLE NOTATIONS NOTE 1:

Overtemperature N-16 2

N=K - K, [1+ T 5 T, - T,*] + K (P-P ) - f 3(aq) i 3

1+ I,S Where:

N

= Heasured N-16 Power by ion chambers.

Cold leg temperature.

• F.

T,

=

560.5"F for Unit 1, 560.8*F for Unit 2 - Reference T, at RATED THERMAL POWER.

T,'

=

1.150.

K

=

i 0.01730.0148/*F for Unit 1 l

K,

=

i 0.0138/*F for Unit 2 The function generated by the lead-lag controller for 1+ 15

=

3 1+ 1,S T, dynamic compensation.

Time constants utilized in the lead-lag controller for

=

13, 12 T,.

1, 2 10s, and 1, s 3s.

= 0.0008000.00083/psig for Unit 1 l

K

=

3 0.000720/psig for Unit 2 COMANCHE PEAK - UNITS 1 AND 2 2-9 Unit 1 - Amendment 14.21.40.52 Unit 2 - Amendment M.38

_ _ _ _ _ _ _ _ _ _ to TXX-97228 Page 4 of 5 TABLE 2.2-1 (Continued)-

TABLE NOTATIONS (Continuedl NOTE 1:

(Continued)

Pressurizer pressure, psig.

P

=

2235 psig (Nominal RCS operating pressure).

2P >

Laplace transform operator, s-2 S

and f,(a q) is a function of the indicated difference between top and bottom halves of detectors of the power-range neutron ion chambers: with gains to be selected based (n measured instrument response during plant STARTUP tests such that:

For Unit 1 (1) for q, - q, between -65% and +5.0% +4-64. f,(a q) - 0. where q, and q, are l

percent RATED THERMAL POWER in the top and bottom halves of the core respectively, and q, + q,is total THERMAL POWER in percent of RATED THERMAL POWER.

(ii) for each percent that the magnitude of q,

% a.4ceeds -65%. the N-16 Trip Setpoint shall be automatically reduced by ~.0t* of its value at RATED THERMAL POWER. and (iii) for each. percent that the magnitude of q, - q, exceeds +5.0% +4-64 the N l Trip Setpoint shall be automatically reduced by 2.15% 3-644 of its value at l

RATED THERMAL POWER.

No Setpoint reduction is required for the span of the al indication.

COMANCHE PEAK - UNITS 1 AND 2 2-10 Unit 1 - Amendment R:E4.52 Unit 2 - Amendment 7.38

3

.- to TXX-97228 Page 5 of 5 t

. TABLE 2.2-1 (Continued)

TABLE NOTATIONS (Continued) 1 NOTE 1:

(Continued)

For Unit 2 (I) for q, - q, between -65% and +2.5%. f (a q) - 0, where q, and q, are percent RATED 3

THERMAL POWER in the top and bottom halves of the core respectively, and q,4 q,is. total' i

THERMAL POWER in percent of RATED THERMAL POWER.

t (ii) for each percent that the magnitude of q, - q, exceeds -65%. the M-16 Trip Setpoint

)

shall be automatically reduced by 1.86% of its value at RATED THERMAL POWER. and (iii) for each percent that the magnitude of q, - q, exceeds +2.5%. the N-16 Trip.Setpoint shall be automatically reduced by 1.65% of its value at RATED THERMAL POWER.

i NOTE 2: The channel's maximum Trip Setpoint shall not exceed its computed Trip Setpoint by more than 3-644

[

1.72% of span for Unit 1 or 1.88% of span for Unit 2.

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COMANCHE PEAK - UNIT 1 AND 2 2-11 Unit 1 - Amendment No. 14. 21. 41. 4^. 52 Unit 2 - Amendment No. 7. 21, 35. 38 h