ML20195F529

Proposed Tech Specs Revising Core Safety Limit Curves & Overtemperature N-16 Reactor Trip Setpoints for Unit 2 Cycle 5

ML20195F529
Person / Time
Site:	Comanche Peak
Issue date:	11/11/1998
From:	TEXAS UTILITIES ELECTRIC CO. (TU ELECTRIC)
To:
Shared Package
ML20195F525	List: ML20195F519 ML20195F529
References
NUDOCS 9811200021
Download: ML20195F529 (8)

Text

{{#Wiki_filter:__ _ ~. _ _ _ _ _ _ _ _. _. _ _. _ _ _ _ _ l ( to TXX 98240 Page 1 of 5 i i. l / l 67C: / 552 Uns:::ec t :Ie Coe r sit i n 65o 7 2385 s sig ( u., 6 4 6. N 3 w N [c/ 2235sgig ,e > ' x v 0.\\ v 185 asig / S h-5E st 600 ceptab le Speration 59C 58; 20 40 60 80 100 120 Percent of Rated Thermal Power i FIGURE 2.1 lb i Unit 2 REACiOR CORE SAFETY LIMITS l l 1 COMANCHE PEAK UNITS 1 AND 2 23 Unit 1 Amendment No. 21.52 Unit 2 Amendment No. 7.38 9811200021 981111 e-PDR ADOCK 05000445 P PDR z,

' to TXX 98240 + Page 2 of 5 670 660 -- Unacceptacie -. !L Operation 650 P = 2385 psig 640 i P = 2235'psig i i i E e 630 i l <C ( i H I i E 620 ~ P = 1985 psig o \\ CC ~ I LP = 1845 psig-610 I l i i ~ t l ~ i' ~ A' P**

• 600 l

Operation l i 1 i i 590 \\ 580 0 20 40 60 80 100 120 Percent of Rated Thermal Power FIGURE 2.1 1b Unit 2 REACTOR CORE SAFETY LIMITS COMANCHE PEAK UNITS 1 AND 2 23 Unit 1 - Amendment No. 44-21.52 Unit 2 Amendment No. 7.38

~ ~ ^.to TXX-98240 Page 3 of-5 TABLE 2.2-1 (Continued) TABLE NOTATIONS NOTE 1: Overtemperature N-16 N Q,,,, J = K. - Kr [1+ T & T - T'] +'K 3 (P-PI) -f 1(aq) c c 1+ T S 2 Where: M Q,,1,m "co nrcd N 15 "cwcr by ior. ch=bers 0vertemperature;Nf16ftripjsetpoint, = i T = Cold leg temperature.

• F, c

i 560.5 F for Unit 1, 560-6 560.6*F for Unit 2 - Reference T at RATED THERMAL POWER, T' = c c K 1.150 = 1 0.0148/*F for Unit 1 K = 2 0.0130 0.'0147/*F for Unit 2 The function generated P.y In lead-lag controller for 1+ r iS - = 1+ 1 S T dynamic compensation, 2 c Time constants utilized in the lead-lag controller for l = ti, 12 T,1 2 10s, and 1 s 3s, c 1 2 = 0.00080/psig for Unit 1 K = 3 0.000720 OiOOO770/psig for Unit 2 n COMANCHE PEAK - UNITS 1 AND 2 2-9 Unit 1 - Amendment 14.21.40.52 Unit 2 - Amendment 7-35.38

AttachmentL3 to TXX-98240 .Page 4 of 5' TABLE 2.2-1 (Continued) TABLE NOTATIONS (Continued)' NOTE 1: (Continued) For Unit 2 (I) for q. - q between ~65% and +7-W+5.1%. f (a q) = 0. where q and g are percent RATED t THERMAL POWER in the top and bottom halves of the core respectively, and q, + q is total THERMAL POWER in pe: cent of RATED THERMAL POWER. (ii) for 'each percent that the magnitude of q, - q exceeds -65%. the N-16 Trip Setpoint shall be. automatically reduced by 0.0** of its value at RATED THERMAL POWER, and (iii) for each percent that the magnitude of q, - q, exceeds +7-R;+5~.1%. the N-16 Trip Setpoint shall be automatically reduced by 2-0M 2.28% of its value at RATED THERMAL POWER. No setpoint reduction is required for the span of the aI indication. NOTE 2: The channel's maximum Trip Setpoint shall not exceed its computed Trip Setpoint by more than 1.72% of span for Unit 1 or 664 2;82% of span for Unit 2. 1 COMANCHE PEAK - UNIT 1 AND 2 2-11 Unit 1 ,eendment No. 14, 21, 41. 40, 52 Unit 2 - Amendment No. 7. 21, 35. 38 i

ATTACHMENT 4 to TXX-98240 ITS TECHNICAL SPECIFICATION MARKUP Figure 2.1.1 1 Page 2 of 2 Table 3.3.1-1 Page 8 of 9 i \\ 4 W

t I i

67i,

.l j A l 6o.6-j eptabl[e. Unacc Opera tion 65t 4 'T85 tsig ~ \\ n/ M .1 u.646 6 3 3 0 N N \\ c' 7 / astg j Sit ,N \\ 5p si 60t-Acceptab 0peratio 59' 58: 2! 40 60 80 100 120 0 rcent of Rated Thermal Power i Figure 2.1.1 1 (page 2 of 2) Reactor Core Safety Limits (Unit 2) i (

6*io 660 5 ( Unacceptacle l-650 i Operation i P = 2385 psig 1 1 640 l P = 2235 psig . 4-i e 630 I' 1 i 4 i-l d 620 -P = 1985 psig x ) l o CC l l i i I 610 -P = 1845 psig-I 1 I \\ i. I, i Acceptable 600-Operation l ,I l ) i 590 i i i f i i 580 0 20 40 60 80 100 120 Percent of Rated Thermal Power l. Figure 2.1.1 1 (page 2 of 2) Reactor Core Safety Limits (Unit 2) a e f o - t i i-

ESFAS Instrumentation l 3.3.2 Table 3.3.1-1 (page 8 of 9) Reactor _ Trip System Instrumentation l Note 1: Overtemoerature N-16 Tha Overtemperature N-16 Function Allowable Value shall not exceed the following satpoint by more than 1.72% of span for Unit 1, or 4-66% 2.82% of span for Unit 2. l l (1+f(s) + K,(P - P ')- f,(A q) Qsetpoint = K,- K, T T c c Where: .g = Licasured N-10 Powcr by ion chambcra 04'artemperature: N-16; trip.setpoint K, = 1.150, K = 0.0148/*F for Unit 1 2 = 0.010S! F 0.0147/*F. for Unit 2 K = 0.00080/psig for Unit 1 3 = 0.000720/psig 0.0.007.70/ps!g for Unit 2 Te = Measured cold leg temperature i T,* = Reference Tc at RATED THERMAL POWER = 560.5*F for Unit 1 = 000.8'r 560.6'F for Unit 2 P = Measured pressurizer pressure, psig P = Nominal RCS operating pressure a 2235 psig I s = the Laplace transform operator, sec-'. T, a 10 see T s 3 sec 2 f,(Aq) - 0.00-{(q, - q ) + 65%) when (q,- ge) s -65% RTP l-Unit 1: 0% when -65% RTP < (q,- q ) < 5.0% RTP i 2.15-{(q, - go) - 5.0%} when (q,- q,,) 2 5.0% RTP 1 i 0.0-{(q,- q,) + 65%} when (a,- ge) s -65% RTP Unit 2: 0% when -65% RTP < (q,- q,,) < 7-5% 5.1% RTP 2.00-{(q, - q,) - N 5s1 %} when (q,- q3) 2 7-5% 5.1% RTP l 4 i l _}}