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

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552 , Uns:::ec t :Ie Coe r sit i n 65o ,.  % 7 2385 s sig ( , N u., 6 4 6. 3 w - N [c/ 2235sgig

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0 .\ v 185 asig

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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,

+ Attachment 3 to TXX 98240 Page 2 of 5 670 660 -- Unacceptacie -. Operation !L 650 P = 2385 psig 640 i P = 2235'psig E -  ; i' i i e 630 , i ( l

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P = 1985 psig E 620 - o -

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                                                           ,             I 610                ,

LP = 1845 psig- -- i I i

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i i 590

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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

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Attachment 3.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 & cT - T'] c +'K 3 (P-PI) -f 1(aq) 1+ T 2S Where: M Q,,1,m =

                                    "co nrcd N 15 "cwcr by ior. ch=bers 0vertemperature;Nf16ftripjsetpoint, i

Tc = Cold leg temperature. *F, i T' c

                        =    560.5 F for Unit 1, 560-6 560.6*F for Unit 2 - Reference T c at RATED THERMAL POWER, K1    =    1.150 K2    =    0.0148/*F for Unit 1 0.0130 0.'0147/*F for Unit 2 1+ r iS -    =     The function generated P.y In lead-lag controller for 1+ 1 2S            Tc dynamic compensation, ti,   12
                          =     Time constants utilized in the lead-lag controller for                                                                                      l T,1 c    1 2 10s, and 12 s 3s, K3  =        = 0.00080/psig for Unit 1                                                                                                                         ;

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 t (a q) = 0. where q and g are percent RATED 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

1 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 I l

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6o.6- , j Unacc Opera eptabl[e. tion 65t  ;

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60t-  % Acceptab 0peratio 59' 58: 0 2! 40 60 80 100 120 rcent of Rated Thermal Power i Figure 2.1.1 1 (page 2 of 2) Reactor Core Safety Limits (Unit 2) i (

6*io l 660 - 5 ( Unacceptacle l-i Operation i 650 - P = 2385 psig  ; 1

                                                                                                   '                                                    1 640 P = 2235 psig

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e 630 , I'  ! 4 - 1 ' i i- l

                                                           '                         ' -P = 1985 psig                       x   _

o d 620 .

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l CC - l i 610 I -P = 1845 psig- - 1 I I

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I, 600-

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590 _ i  : i i f  ! i

i 580 20 40 60 80 100 120 0

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

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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 Qsetpoint = (1+f(s) K,- K, Tc Tc + K,(P - P ')- f,(A q) Where:

            .g         = Licasured N-10 Powcr by ion chambcra 04'artemperature: N-16; trip.setpoint             -

K, = 1.150, K2 = 0.0148/*F for Unit 1

                = 0.010S! F 0.0147/*F. for Unit 2

! K3 = 0.00080/psig for Unit 1

                = 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 T2 s 3 sec f,(Aq) - . 0.00-{(q, - q ) + 65%) when (q,- ge) s -65% RTP l 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 4 2.00-{(q, - q,) - N 5s1 %} when (q,- q3) 2 7-5% 5.1% RTP l i l _}}