ML20032A159

Nonproprietary Version of Westinghouse Reactor Protection Sys/Esf Actuation Sys Setpoint Methodology. W/Oversize Table 3-4,Revision 01.Aperture Card Available in PDR

ML20032A159
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Site:	Summer
Issue date:	10/19/1981
From:	Miller R, Sharp D, Tuley C WESTINGHOUSE ELECTRIC COMPANY, DIV OF CBS CORP.
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Text

__7.

WESTI. GHCUiE xC:RIETAF.Y CLASS 3 1

a-

/

i WESTINGHCUSE REACTCR ?ROTECTION SYSTEM / ENGINEERED S AFETY FEATURES ACTUATION SYSTEM SETPOINT METHODOLOGY h

Y('h p/

i C. R. Tuley D. R. Sharp R. E. Miller i

l i

?

This document contains in formation proprietary to West.inghouse 4

- Electric Corporation; it is submitted in enn fidence and is to be used solely for the purpose for which it is furnished and i

returnea upon request.

This document and sucn in formation is not to se reprooucec, transmitted, oiscloseo or usec otherwise 4

in whole or in part without authorization of Westinghouse-Electric Corporation, Nuclear Energy Sys tems.

1 h.

WESTINGHOUSE ELECTRIC Nuclear Energy Sys tems P. Q. Ecx-355 Pittsourgn, Pennsyh ni?

15230 2

t-8110280379 811019 PDR/-DOC %05000g

~

0 Westinghouse Proprietary Class 3 4

TABLE OF CONTENTS Section Title Page

1.0 INTRODUCTION

1 -1 2.0 COMBINATION OF ERROR COMPONENTS 2-1 2.1 Methodology 2-1 2.2 Sensor Allowances 2-2 2.3 Rack Allowances 2-4 3.0 RESPONSE TO NRC QUESTIONS 3-1 3.1 Approach 3-1 3.2 Definitions for Protection System 3-1 Setpoint Tolerances 3.3 NRC Questions 3-6 4.0 TECHNICAL SPECIFICATION USAGE 4-1 4.1 Current Use 4-1 4.2 Westinghouse Statistical Setpoint 4-2 Methodology for STS Setpoints 4.2.1 Rack Allowance 4-2 4.2.2 Inclusion of "As Measured" 4-3 Sensor Allowance 4.2.3 Implementation of the 4-4 Westinghouse Setpoint Methodology 4.3 Conclusion 4-6 APPENDIX A SAMPLE STS SETPOINT TECHNICAL SPECIFICATIONS A-1 i

_= -_

Westinghouse Proprietary Class J 4

LIST OF TABLES Table Title Page 3-1 Tavg Channel Accuracy 38 2 Overtemperature aT Channel Accuracy 3-9 3-3 Overpower AT Channel Accurac-3-11 3-4 Reactor Prctection System / Engineered Atidchment Safety Features Actuation System Channel Error Allowances and Notes 4-1 Examples of Current STS Setpoint Philosophy 4-8 4-2 Examples of Westinghouse STS Rack Allowance 4-8 i

ii

f Westinghouse Proprietary Class 3 LIST OF ILLUSTRATIONS-Figure Title Page 4-1 NUREG-04S2 Rev. 2 Setpoint Error Breakdown 4-9

)

I,

[

4-2 Westinghouse STS Setpcint Error Breakdown'-

4-10 l-s I

1 1

i

~

t I

i I

r i

I t

l I

i-iii i

WESTINGHCUSE :R0p;!ETARY 2 45$ 3 1.0 "NTROCUCTION In Mac:h of 1977, ne NRC requestec seversi utilities with Westinghouse Nuclear Steam Su:oly Systems to reply to a series of questions concern-ing the methodology for determining 1.,strument setpoints.

This document contains the Westinghouse response to those questions with a correscond-ing defense of the technique used in cetermining the overall allowance for each setpoint.

The inform.ation desired :e-tains to tne various instrument channel com-ponents' analysis assumptions, i.e., a channel breakcown and values, for the Reactor protection System (RPS) and tne Engineered Safety Features Actuatien System (ESTAS).

5 cme of the information requested -is already availaole in public documents, e.g., Chapters 15 and 15 of the Safety -

Analysis Reoort.

The rest of the information has not been released and is drawn from equipment specifications or analysis ass'umptions.

This information is considered proprietary and is noted a's' such.

The basic underlying assumption used by Westinghouse is that several of the error components and their parameter asswnptions act independently, e.g.,[

] a,c j

u This allows the use of a statistical summation of the various breakdown components instead of a strictly arithmetic summation.

A direct benefit of the use of this technique is increased margin in the total allow-ance.

For those parameter assumptions known to be interactive, the technicue uses arithmetic summation, e.g, [

]ta,c The explanation of tne overall ascroach is provided in

~

Section 2.

Section 3 presents the informction requested along with three examples of individual enannels, Tavg, Overtemperature 47, and Overpower aT.

Also located in this section are descriptions, or cefinition, of the

+

l 1-1 l-

~

c..: ;

?. pc. ~. t.:.c. :- :..:. :n v....23. 3 ws vario$sparameter_susec.

This insures a clear understanding of the trea<cown presentec, in nearly all cases a significant inargin exists ce: ween the statistical su:m:ation anc the total allowance.

inally, Section 1 of this recort notes the current philosophy for set-

oints in the Westinghouse generic Standard Tecnnical Saecifications _(W.

STS).

Also cresented in tnis section is a proposal with examoles of a new anilosophy utilizing a five column table allowing for rack "as mea-sured" parameter drift and sensor "as measurec" parameter crift.

ThiQ

~

~

1ew pnilos, cony is based on 'he methods of verifying se points in the pian and reflects the'31 day and 15 month surveillance recuirements, f

1 1

1 1

I a'

b i

o i

j.

l 1

O i,

i l

l 1

e I

e h

I 4

1-2 I

s vv

-.m

~-~~

v

~

x-a --sua..v en. n Js q

.3,.r.v..Js --eJs

-t i.

m..v I

2.1 Me*noCCICCy t

Tne metaccciogy used to ccmcine the errer ccmoonents for a channel is casically she accrocriate statistical comoination o f these groups o f

mocnents wnich are statistically independent, i.e., not interac tive.

Those errors wnich.3-e: not incepeqdent are acded arithmetically into groups.

The grou:s tcemselves are incecencent e f fects wnicn can hen be systematically C0moinec.

Tne metnccology useo for tnis comoination is not new.

Basically it is tne(-

j ' "2' C 's' wnich has-ceen utilizec in other Westingnouse reocrts.

This tecnnique, or o ther s ta-tistical approaches of a similar nature, have been usec in WCAP-g 9150II) anc WCAP-3567 f)

It snculd be notec that WCAP-2567 nas been approved by the AGC Sta ff thus noting the acceptability o f s tatis-tical techniques for the application requested.

It should also be re-cocnized that the Instrument Society o f America accroves o f the use o f -

statistical techniques in determing safety-related instr.umentation set-ce in ts '3)

Thus is can be seen that the use of statisti, cal approaches

-I i

in analysis techniques is becoming acre and more widesprjead.

The relationship between the errer components and tne total statistical error allowance for a channel is,

-a,c r

3

(.c. 2.1) 0 (1) Little, C.C., Kopelic, S.

O., and Chelemer, H., "Consiceraticn a f Uncer cainties in the Speci fication of Core Hot Channel Pactor Limi ts. " ~ WCAP-9180 (Propr ietary), WCAP-9181 ~ (Non-propr ie tary),

l

. Sept?moer, 1977.

4 (2) Chel emer, H., Scwman, L. H., anc Sharp. D. R., "Imorovec Thermal Cesi gn Procecure," WCAP-55c 7 -(?roprietary), ~CA?-8753 (Non-pro-prietary), July,1975.

(3) Instrument Society o f America, oroposea stancarc SP67.04, "Se tpo in ts oower o l an ts. "

f:r 5a fety Relatec Instrumentaticn Usec in Nuclear l

-1 i

a-

....p... ;. p,,..y yg v w...

~

4

.,n e r e :

i Ta,c l

4 I

a 4

As can ce seen in Equation 2.1, [

]ta,c allowances are interactive and thus not incependent.. The[

]

is not neccessarily considered interactive with'all other parameters, but as an added degree of conservatism is -adced aritnmetically to the statistical sum.

+

2.2 Sensor Allowances Four parameters are considered to be senser allowances, [

I

]"'c (see Table 3 4).

Of these four parameters, two are consicered to be statistically ince;encent, [

]I3'C and two are consicerec interactive [

] 3'C

[

{

] a,c are consicerea to te incepencent cue to the manner in,>nicn i

the ins trumentation is checked, i.e., tne instrumentation is [

l

] " ' C An examole of this would be as follows; m

t I

2-2 i

i

c

- -.amg es ;ys...v

, _ ;y s,

- ~ - - -

t l'

b 3

t

] '

'2 'C are censidered to be interactive for ne same reason :nat e

r

,i

[

] ' 's are ConsicereC ince encen, i.e.,

ue to *.ne manner in ahiCn the ins *Tumen0d*iCn is CneckeC.

L r

}

3 4

ata,C

]Ia'C Based on this reasoning, [

j have been addec to form an independent group which is then factored into Equation 2.1.

An examole cf the impact of this treatment.is; for Pressurizer Water Level-High (sensor parameters only):

t 6

..i ta,b,c

,o

-)

2 Q

2 e

using Ecuation 2.1 as written gives a total of; s

7 a,C 1

e 1.56 er:eni

=

s e

r: -

---

.,o m.

m.

t s s a.?.i ng r.0 ir.terac,*.ve iffec s f r any Of'*,ne Carhp, fes gises One

~

f0Iltwing results:

i Ta,C n

(Ec. 2.2)

= 1.32 ;:ercent Ihus it can be seen nat One accroach represe'*tec by Ecuation 2.1 which ac 0unts f0r interaC;ive parameters results

'<n a Cre conservative surr'-

cation Of the allowances.

2.3 Rack Allowances Fcur :arameters, as noted oy facle 3-.1, are consicered to be rack allow-t a,c ances,i-i inree or these parameters are

~

considered to be interactive (for much the same reascn outlined for

~

sensor; in 2.2), [

]ta,c

{

I l

-Ta,c l

J Sasec cn this logic, these Onree factors have been accec to form an incecencent c.roup.

This c.roup is then f actorGc int: :cuation 2.1.

The

(

imcact of this accroacn (formation of an independent group based cn i

l interactive c:mponents) is significant.

Fce the same cnannel using the,

same accccacn cutlined in Ecuations 2.1 anc 2.2 the folicwing results are reacnec:

I l

24 i

(

ll-

.m

r-

=

2.

1 i

1 i

f l

g 1

..... -..". :. e c.

u-15,'

'.'S i n c

,". 2 * '.

-2.,,

.I i

l

...L

. c.

. s... e.

fa. r.an.v ' #.

• a. s. a a r.$.~..c.. *. *>,d e. l c.e

• .s C..e.m i r. a

.C

i. n *. *." $. ". *. i v e. 2. ". **

y

w. w r i.Cwin c 195 5 Cn servative res ul *.;

3

e. 3

,6 (7.G. 7..'1 ')

1. 1.*

. r e.a.n *s 2

L a.

,J s o.

3 :. :"A'.2 * '. C n

.0 1 i '.

• v 3. ". 3'r c.2 *c..

ia

• 1 e.= r c. 2

-.y g... o.

4...w.a r. e. :

o a.

5.qswr.

-.i n c.r. o. t.a r c.,

2. r.

• c..*.' n a fv*

• Tr.*..s. -

• ^ r *..". a.

a a

F. *.. r.2 C k *. *.** c. *. S

.1.2 n

.v y

3Ctive e f,ects in *he S ta t15:1 Cal tres *. Tent O f Onese al,s Cw2nces insures e - e. = e,l 2. *.1 / a.

- =. 5,J 'i ~..

a.

wwe 6 3.

} g f.3 Q A. *.O..' C.

2 f C.

"C C $ i F.3.e.C. o.

• Q )4 I E. f.2 ) ) y, *. A.

f

=

...w s o.

4,

...ws'...,,..

3=94

=.

• "e.s :.

• w a r. 2.m *. *. # 5 i n u t.,

.. s

..2.j-.4..2.i '.,y

.e.s c. s f c. e.

i q.n

.g a.4 q

?.

1..

s.

.2.-.- 2. c. e..

9.*

WESTINGh0USE :RCPR*E7 FY CL.A55 3 3.0 RESPONSE TO NRC OUESTIONS 3.1 Accroach As 'noted in Section One, Westinghouse utilizes a'statiscical summation of The _ various compcnents of the channel breakdcwn.

This appecach is valid wnere no ce;endency is present.

An aritnmetic summation is

-ecuirec wnere an interaction between two carameters exists, Section Two-crovides a rore detailed explanation of :nis soproach.

The ecuation used to determine the margin, and thus tne acceptacility of the param-i eter ialues used, is:

ta,c,

p-t (Eq. 3.1) ~

wnere:

t

[

J a,c, and

)

all other paramethrs are as defined for Ecuation 2.1.

-2 Taoles 3-1 through 3-3 provide examples of indivicual cnannel breakdowns and margin calculations for Tavg, Overtemperature aT, and Overpower aT.

It should be noted that only those channels which Westinghouse takes credit for in the analysis are provided with detailed breakdowns.

For those c. dnnels mot assumed to be primary trios, tnere are no Safety

. analysis Limits, thus no Total Allowance or Margin can be determined.

~

f 3.2 Definicions for Protection System Setooint Tolerances To insure a clear understanding of the channel breakdown usec.by. West-

~

ingncuse in this report, tne felicwing definitions are noted:

3-1

= - -.

WEST:':GMCUSE FROPRIETARY CLASS 3 -

-:: accuracy The :clerance canc containing the hignest ex:ectec value of the cifference :etween-(a) tne cesirec trio point value of a crocess variaole and (b) the actual value at ahich a comparator-trips (and thus actuates scme cesireu result).

This is ne tolerance band, in cercent of scan, wi:nin which the complete channel must p3rform its intenced :rio function.

It incluces cocoarator setting accuracy, cnancel accuracy (inclucing :ne sensor) for eacn intur, anc environ-mental effects on :ne rack-mounted electronics.

It comorises all instrumentation errors; however, i t coes not i ncluce process measurement accuracy.

2.

Process Measurement Accuracy Includes plant variaole measurement errors up to but not including the sensor.

Examples are the effect of fluid stratification on tenperature measurements and the effect of changing fluid density on level measurements.

~

3.

Actuation Accuracy

.5ynonymous with trip accurccy, but used where the word " trip" does not apply.

4 Incication Accuracy l

The tolerance bana containing the highest expected value of the J

difference cetween (a) the value of a process variable read on an inoicator or recorcer and (b) the actual value of that process i

variaole.

An inoicaticn must fall witnin this tolerance Danc.

It incluces cnannel accuracy, ' accuracy of reacout device', anc rack s

environmental effects, ut not process measurement accuracy sucn as fluia stratification.

It also assumes a controllec environment.for the reaccut device.

3-2

-e,,e-4

+ge-v

,w

-9

.--g.w5

-w- - - - -

s.,+,.-ey,m,3 9

,yewy.y 9,

w9,-,w,

,e--ymg

.e-c.

+-9 p--

. arce.; -c:cricv he accuracy c f.an analeg cnannel anicn -incluces :ne accuracy o f One

rimary.elemen; and/cr transmitter anc mocules in the enain wnere calicration oi mocules intermeciate in a cnain is allowee ';c ccmcen-sa:e for errors in o ther: mocules o f the -cnain.

Rack envircnmental ef fects are not inclucec nere te avoic cuplication cue :c cual incuts, hcwever, acemal environmen tal e f fec:s en fiele moun tec harc-ware is includec.

'5.

Senser A11cwaoie Ceviation The accuracy that can be ex;ectec in the fi e lc.

I incluces cri f,

temoerature e f fects,- field calitraticn anc for the case o f c/; :rans-mitters, an alicwance for the e f fect a f static pressure variaticns.

The telerances are as follows:

a.

Re ference (calibration) accuracy - [

]tabc percent unless other data indicates more inaccuracy.

This accuracy is the SAMA r-e ference accuracy as de fined in SAMA s tandard PMC-20-1-1973(1) 0;.

iemcerature e r fect - [

]..* b c percent basec on a nominal temperature coe f ficient o f [

] abc percer:/100 F and a U

0 maximum assumec change o f 50 F, c.

Pressure e ffect - usually calibrated cut because cressure is itaDC con s tan t.

It not constant, ncminal L j

percent is usec.

Present cata incicates a static cressure e f fect o f accroxima:ely [

]tacc percen:/lC00 psi.

c.

Or i ft - hange in input-cutsut relationsnip ever a period o f time at re ference cencitiens (e.c., [

]' a" -

L

]tacc o r span.

3-3 A.

~.

p 3 --

t I

7 Eac.< il'owaole Ceviation 4

i Tne tolerances are as follows:

a.

Rack Calibration Accuracy The accuracy,tnat can be expectec during a calibration at refer-ence conditions.

This acduracy is the SAMA reference accuracy as

/1 cefinec in SAMA stancarc PMC-20-1-1973'-).

This..incluces all modules in a rack and is a totai of [

p acc percent of

' span assuming the chain of mocules is tuned to this accuracy.

I For simple loocs wners a power supoly (not used as a converter) is the only rack mooule, tnis accuracy :nay be ignorea.

All rack l

mocules incividually must have a reference accuracy within

• t ao' C L

j percent.

i b.

Rack Environmental Effects i.

j.

Includes effects of temperature, humidity, vcltage, and frequency changes of which temperature is the most significant..An f

accuracy of [

] abc percent is used which considers;a 0

O j

hominal cmcient temperature of 70 F with extremes to di F 'and U

120 F for snort periods of time.

c.

Rack Drift (instrument channel drift) - change in input-outout f

relationship over a perica of time at refer ence conditions (e.g.,

[

] a,c -

1 percent of span.

i-c.

Comoarator Settinc Accuracy l

Assuming an exact electronic inout, (Note that the channel

[

>~uracy" takes care of deviations from this iceal), the c

t I

[

(1) Scientific Toparatus Manufacturers Association, Standard PMC-20-1-1973, " Process Measurement and Control Terminology."

i

[

~

~~

~

~ %ESt:.NGMCUS! :R'CP;II :?.v ;L/SS 3 - ~

~

^

lerance en :ne crecisicn with wnicn a c:moara:or trip value can

e set, si:nin.such practical : nstraints 15 time' anc effor:

ex;erced in making tne setting.

'The tolerances are as follcws:

(a) Fixec setpoint with a. single inout - [

]Tacc percent accuracy.

This assumes that ccmparater nonlinearities.are ccmcensatec by the setooint.

(b) Dual input - an acci:icnai [

]ISUC cercent must be acced for ccmoarator nonlinearities between two inputs.

-taDC Total (

j

.cercent accuracy.

Note:

The following fcur definitions are currently usec'in the-Standarcized Technical Specificat ons (STS).

i 8.

Nominal Safety System Setting The desired setpoint for the variable.

Initial calibration and

d subsequent recalibrations should be made at the nomi.qal safety system a

sett ng (" Trip Setpoint" in STS). d i

i i

9.

Limiting Safety System Setting

.A setting chosen to prevent exceeding a Safety Analysis Limit

("Allowa.cle Values" in STS).

(Violation of'tnis set:ing reoresents an STS violation) 1

10. A11cwance for Instrument Channel Orift The cifference between (S) and (9) taken in the conservative cirec '

t

• icn.

s 3-5 t

. - ~ -

y 7

"~.. Safety :ni ys;5 _im1; 5

The set:cint value assumec in saf ety analyses.

12. Totai Aliewaole Setcoint Deviatien Same cefinition as 9; Out the ci#ference be ween 3 and 12 encoccasses

- ta,C 7'.

3.3 NRC Ouestions Tne information requested oy the NRC for eacn channel is:

1.

What is the tecnnical specification trip setpcint value ?

2.

What is the tecnnical specification allowable value ?

/

3.

What instrument drift is assumed to occur durino the interval between technical specification surveillance tests ?

a.

What are the components of the cumulative instrument bias (e.g.,

instrument calibration error, instrument crift, instrument error, etc.) ?

5.

'What is the margin between the sum of the channel instrumentatior error allowances and the total instrumentation error allowance assumed in :ne accident analysis ?

The Westingnouse response to these questions is:

a.

The res:cnse to Question 1 will be found as Column la of Table 3J in :nis section.

3-6

- awa. 35Mty:-

-s,ur,.:..

.?

..:s a~

~

-:1;mn '3 Of Ta:1e 3 2 :revices tne-inf:rma:icn requestec in Question 2.

i The instrument Orift assumec is the difference between :ne trip set:oint anc :ne allowacle value in the :ecnnical specifications,

nis can be founc as Column 11 of Taole 3 c.

c.

The Oulk of Table 3 4 provices the breakdcwn values recuirec by Question 2 e

The margin recuestec Oy Question 5 is noted in Column 17 Of Ta le 34 It snoulc be remem:= rec tha: 'Wes tinen0use is provicinc res:cnses Only f or

nose cnannels for wnicn credit is taxen in :ne accicent analysis.

Again tnis is cue to the face that Question 5 cannot be answered if,tne channel

~

is not a primary trip.

9 9

9 l

I l

l i

I I

l h

I f

[

l 3-7 l

~.

i

avg '.nannei.-ccuracv 3 ar ame

er A! I cw ance

• I

~

tacc l

i I

_.J

• in percent o f span.

The margin, casec en Equation 3.1, is calculatec as fo l icw s:

7 TaOC

= T.

.N # ".

Tne Tctal A11cwance is 2.0%, :nus tne margin is

,t a,c,c Of span.

4 A

-c

a o.. 4 e e. u,.e _. -_.,,..,e sC

. _. y -.,.--,

es.

-n.

T TABLE 3-2 OVERTEMPERATURE II Allowance" Parameter 3

___-a.:

M W

e I

\\

b s

L 4

0 M

w h

3-9

-n t

.:..". iu..c..e

~r ::. -. :.:.v.

...:.e.

TABLE 3-2 (Continued)

OVERTEMPEMTURE 17

/

Parameter A11 cwa nc e*

-a,c Y

l i

r n

"iv percent span (Tav

- 100*F, pressure - 800 psi, poEer.- 120; Rated I

Themal Power, si - Ih0*F; 100*F span = 150% power)'

l L

Based 'on Equation 3.1 the margin is calculated as fo11cws:

Channel Statistical Allowance =

• a,b c q

f.

eund > M The total allowance is 7.1%, thus the margin ic

[

]+a,b,c of span.

- C I

uur 3-10

4.:... #c.s r.Lt.e: :: c.e ; * *: ;; v

.t..+*.<.-

3 A

.r,o,l.

-J Overccwer si Channel Accuracy P ar a.T.e : er Allowance" aCC i

l a

s t

t I

' in percent of span, (100 F span = 150% power)

J-11

c..s....

4. i...s.-

..n.

s

• 1Of 7 17 [

• m.e * '. e,i e s. M. ),

t ww.

...s.

w i

i s '.".'. I " ' I.2 ". *. *. 25 #

• I I C 'a 5.'

. 3

• A. /. v.g

7..* i.s.3 '. 9svn 1.?

7] c.

,. '. 3.e 9 j a wJ iw i

s s.

4 e.s.g q f M

i h

W h a.

.-31 P ' w l,. = ' 5 4. 5 'a',

~. J c.

. a.

..a r. '2 n

',1

'17' 10 C

• ejM*-b

~

4e

~

u,

.ss.

t s

o.

3 O.

4 o

h 1

l I

l l

I 3 !?

r.

e**

l

\\

At E.4kNn

(Westinghouse Proprietary Class 3) 4.0 TECHNICAL SPECIFICATION USAGE 4.1 CURRENT USE The Standardized Technical Specifications (STS) &s used for Westinghouse type plant designs (see NUREG-0452, Revision 2) utili:es a two column format for the RPS and ESF system.

This format recognizes that the setDoint channel breakdown, as presented in Figure 4-1, allows for a certain amount of rac< drift.

The intent of this format is to reduce the.numoer of Licensse Event Reports (LERs) in the area of instru-mentation setooint drift.

It appears that this approacn has been successful in achieving its goal.

However, the approach utilized is fairly 3implistic [

)+a,c The use of the statistical ~ 'sumsation'technioue described in Sectjon Two of this report allows for a natural axtension of the two column approach.

(

J a,c and allows for a more flexiole approach in reporting LERs.

Also of significant benefit to the plant is the incorporation of sensor drift parameters on an 18 month basis (or more.

often if necessary).

4-1 m4R-

b (Westinghouse Proprietary Class 3) 4.2 WESTINGHOUSE STATISTICAL SETPOINT METHODOLOGY FOR STS SETPOINTS Recogni:ing that besides rack drift the plant also experiences sensor drif t, a different approach, to technical specification setpoints, that is somewhat more sophisticated, is used today.

This methodology accounts for two additional factors seen in the plant during periodic sur,veillance,1) interactive effects for both sensors and rack and, 2) sensor dr'i f t effects.

4.2.1 RACR ALLOWANCE The first item that will be covered is the interactive effects. When an instrument technician looks for [

3+a,c he is seeing more This interaction has been noted several times and is handled than that.

in Equations 2,1 and 3.1 by [

I

]+a,c To provide a conservative " trigger value", the differ-ence between 'the STS trip setpoint and the STS allowable value is deter-mined by two methods. The first is simply the values used in the

3. + a, c The second

[

n

]+a c as follows:

s

[

]+a,c (gq, 4,1) where:

+a,c 4-2 I

_, e,KUG90 _. _ _ _. _

~.

(Westinghouse proprietary Class 3) t.

)+a,c g

i

]##'# As long as the "as measured" value is smaller, the channel is well within the accuracy allowance.

If the "as measured" value exceeds the " trigger value", the actual numbers should be used in the calculation described in Section 4.2.3.

This means that all the instrument technician has to do.during the 31 day periodic surveillance is determine the value of the bistable trip setpoi,nt, verify that it is less than the STS Allowable value, and does not have to account for any additional effects.

The same approach is used for the sensor, i.e., the "as measured" value is used when f

required.

Tables 4-1 and 4-2 show the current STS setpoint philosophy (NUREG 0452, Rev.2) and the Westinghouse rack allowance (for use on 31 day surveillance only).

A comparison of the two different Allowable Yalues will show the net gain of the Westinghouse version.

4.2.2 INCLUSION OF "AS MEASURLD" SENSOR ALLOWANCE -

N If the approach used by Westinghouse was a straight arithmetic sum,

(

sensor allowances for drift would also be straight forward, i.e., a three column setpoint methodology.

However, the use of the statistical l

summation requires a somewhat more complicated approach.

This acthod-ology; as demonstrated in Section 4.2.3, Implementation, can be. sed quite readily by any :perator whose plant's setpoints are based on statistical summation.

The. methodology is based on the use of the f

following equation.

l

[

]+a,c (Eq. 4.2) where:

the "as measured racx value" [

]+a,c R

=

the "as mecsured sensor value" [

]+a,c S

=

4-3

-. ~,

(Westinghouse Proprietary Class 3) ano all other parameters are as defined in Equation A.1.

i Equation 4.2 can be reduced further, for use in the STS to:

Z + R + S _< TA (Eq. 4.3) where:

g 3+a,c Equation 4.3 would be used in two instances,1) when the "as measured" rack setpoint value exceeds the rack " trigger value" as defined by the STS Allowable Value, and, 2) when detennining that the "as measured" sensor value is within acceptable values as utilized in the various Safety Analyses and verified every 18 mon'ths.

4.2.3 IMPLEMENTATION OF THE WESTINGHOUSE SETPOINT METHODOLOGY Implementation of this methodology is reasonably straight forward, Appendix A provides a text and sample table for use in the STS.

An example of how the specification would be used for the Pressurizer Water Level - High reactor trip is as follows.

Every 31 days, as required by Table 4.3-1 of NUREG 0452, Rev. 2, a functional test would. be perfonned on the channels of this trip f unc tion. During this test the bistable trip setpoint would be determined for 'each cha'nn61. i f Oe "-se measured" bi stable tri p

~

setpoint error was found to be less than o equal to that required by the STS Allowable Value, no action would be necessary by the plant staff. The Allowable Value is determined by Equation 4.1 as follows:

+a,c l

4-4

~

(Westinghouse Proprietary Class 3)

+a,c.

~

[

3+a,c assume that one bistaole has " drifted" more than that allowed by the

'us STS for 31 day surveillance.

According to ACTION statement "A", the plant staff must verify that Equation 2.2-1 is met.

Going to Table 2.2-l', the following values are noted:

2 = 2.18 and the Total Allowance Assume that the "as measured" rack setpoint value is 2.25 (TA) = 5.0.

Equation percent low and the "as measured" sensor value is 1.5 percent.

2.2-1 looks like:

Z + R + 5 j[ TA u

2.18 + 2.25 + 1.5 j[ 5.0 5.9 ;[ 5.0 l

l As can be seen, 5.9 percent is not less than 5.0 percent thus the plant staf f must follow ACTION statement "B" (declare.chan:lel inoperable and place in the "tri7 ped" conditi6n).

I't should be noted that if the plant.

j staff had not measured the sensor drift, but instead used the value of.S in Table 2.2-1 then the sum of Z + R + S would also be greater than 5.0 In fact, anytime the "as measured" value for rack drift is percent.

greater than T (the " trigger value"), use of S in Table 2.2-1 will result in the sum of Z + R + S being greater than TA and requiring the.

reporting of the case o' the NRC.

S If the sum of R + 5 was about one percent less e.g., R = 2.0 percent, then the sum of Z + R + S

= 0.75 percent thus R + 5 = 2.75 percent, 4-5 l

e (Westinghouse Proprietary Class 3) would be less than 5 percent.

Under this condition, the plant staff should recalibrate the instrument: tion, as good. engineering practice suggests, but the incident is not reportable, even though the " trigger value" is exceeded, because Equation 2.2-1 was satisfied.

Another example, demonstrating how to account for two sensor channels, is Differential Pressure Between Steamlines-High, where:

'a,c This is less than the 2.5 percent value for T noted for the two channels in Table 3-23ithus it is used for the " trigger" value.

3 L

• 7 s

Table 4.3-L also requires that a calibration be performed every refuel-ing (approximately 18 months).

To sati sfy thi s-requirement, the plant staff would determine the bistable trip setpoint (thus determining the "as measured" rack value at that time) and the sensor "as measured" val ue.

Taking these two "as measured" values and using Equation 2.2-1 again the plant staff can determine that the tested channel is in fact within the Safety Analysis allowance.

4.3 CONCLUSION

Using the above methodology, the plant gains added operational flexibilty and yet remains within the allowances accounted for in the 4-6

,q

. _~_=.;__

(!!estinghouse Proprietary Class 3) various accident analyses.

In addition, the methodology allows for a sensor drif t factor ana an increased rack drif t factor.

These two gains -

should significantly reduce the problems associated with channel drif t and thus decrease the numoer of LERs while allowing plant operation in a safe manner.

l 0

/

1 m

e 4-7

(!1estinghouse Proprietary Class 3) r TABLE 4-1

~XAAPLES OF CURRENT STS SETPOINT PHIL;050PHY Power Range Pressurizer Neutron Flur. - Hign Preasure - Hign Saf~ety Analysis Limit 113 %

2410 psig STS Allowaole V lue 110 %

2395 psig STS Trip Setpoint 109 %

2385 psig 1

TABLE 4-2 EX;MPLES OF WESTINGHOUSE STS RACA ALLOWANCE Power Range Pressurizer Neutron Flux - Hign Pressure - Hign Safety Analysis Limit 118 %

2410 psig STS AllowcLle value-111.2%

2396 psig (Trigger Value)

STS Trip Setpoint 109 %

2385 psig e

s

_ -emesFq nL 48 kk

(Westinghouse Proprietary Class 3) 9 t

Safety Analysis Lim t l

[

Process Measurement Accuracy i

l Primary Element Accuracy i

Sensor Temperature Effects l

Sensor Pressure Effects Sensor Calibration Accuracy L

Sensor Drift

(

~

I Environmental Allowance / Seismic Alicwance l

~

Rack Temperature Effects

~

l

' Rack Comparator Setting Accuracy i

L Rack Calibration Accuracy STS Allowable Value 1

Rack Drift i

STS Trip Setpoint Actual Calibration Setpoint Figure 4-1 NUREG-0452 Rev. 2 Setpoint Error Breakdown 4

4-9

.Q

(Westinghouse Proprietary Class 3)

Safety Analysis Limit Process Measurement Accuracy l

l Primary Element Ac uracy l

I Sensor Temperature Effects l

i Sensor Pressure Effects l-Sensor Calibration Accuracy i

l L Sensor Drift 1

l Environmental Allowance / Seismic Allowance l

I Rack Temperature Effects 1

STS Allowable Value Rack Comparator Setting Accurac9 i

l 1

l Rack Calibration l

l Rack Drift STS Trip Setpoint l

l t

Ficure 4-2 Westinghouse STS Setpoint r.rror Breakdown l

l 4-10

l (Westinghouse Proprietary Class 3)

APPENDIX A s

SAMPLE STS SETPOINT TECHNICAL SPECIFICATIONS 2.2 LIMITING SAFETY SYSTEM _ SETTINGS INSTRUMENT SETPOINTS REACTOR TRIP SYSTEM 2.2.1 The Reactor Trip System instrumentation setpoints shall be set consistent with the Trip Setpoint values shown in Table 2.2-1.

APPLICABILITY:

As shown for each enannel in Table 3.3-1.

ACTIONr A.

With a Reactor Trip System instrumentation channel setpoint (for rack components only) less conservative than the. value shown in the Allowable Values column of Table 2.2-1, determine that the following equation is met for the affected channel:

Z + R + S < TA (Eq. 2.2-1) whe re:

2 = the value from column Z of Table 2.2-1 for the affected

channel, R = the "as measured" value (in percent) of rack error for the affected channel, S = either the "as measured" value (in percent) of the sensor error, or the value in column S'of Table 2.2-1 for the affected channel, and TA = the value ~ from column TA of Table 2.2-1 for the affected c hannel.

With the requirements of-Equation 2.2-1 not met, declare the channel B.

inoperable and apply the applicable ACTION statement requirement of specification 3.3.1.1 until the channel is restored to OPERABLE Status with its trip setpoint adjusted consistent with the Trip Setpoint value.

O A-1

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6 7

8 9

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I ill!!!ll I

jl!

(

(Westinghouse Proprietary Class 3)

TABLE'2.2-1 (Continued 1 REACTOR TRIP SYSTEM INSTRUMENTATION TRIP SEIPOINIS

'f Sensor Functional Unit Total Allowance {TA) 2 Delf t (S)

Trip Setpoint Allowable Value

-4.2 (10)

(10) 1 76 of bus voltage (10)

18. Undervoltage - Reactor Coolant Pump

19. Underf requency - Reactor 1.3-(10)

(10) 157.2ilz (10).

Coolant Pumps

20. Safety injection input from ESF NA NA NA NA NA 4

.1 l

l

{

i l

j

• Loop design flow = 36,900 gpa

'~

=

I h

A-3 e

(Westinghouse Proprietary Class'3)

TABLE 2.2-1 (continued)

REACTOR TRIP SYSTEM INSTRUMENTATION TRIP SETPOINTS NOTATION Overteeperature aT (p,- 3 ) (p,3 g) < aT {Kg-K2.I g 4'5g) [T(g,gI 1+1 5 1+1 I

~ I I^I N NOTE 1:

g g

T TS 3

I 6

i+T 5 g

p g = lead-lag compensator on measured al Where:

1 2

- Time constants utilized in the lead-lag controller for aT, Tg = 8 secs.,

l T g,:T2 2= 3 secs.

T r

1 l

3,3-

- Lag compensator on measured aT

. l t

- Time constant utilized in the lag compensator for AT, T3 = 2 m s.

j i

1 3 l

aTo

- Indicated aT at RATED TilERMAL' POWER 2,

L K1,

- 1.095 K2

- 0.0133 1+T 5 l

4

- The function generated by the lead-lag controller for Tavg dynamic compensation 3,

Time constants util'ized in the lead-lag controlicr for Tavg, 14 - 28 secs.,

r,T5 4

S " 4 " S*

T T

= Average temperature *F I

i, g - Lag compensator on measured Tav9

,i

~

(Westinghouse Proprietary. Class 3)

TABLE 2.2-1 (continued)

REACTOR TRIP SYSTEM INSTRUMENTATION TRIP SETPOINTS tl0lAfl0N NOTE 1:

(continued)

=TimeconstantutilizedinthemeasuredTavgl$gcompensator,16 - 2 secs.

1 6 588.2*F (Nominal Tavg at RATED TilERMAL POWER)

T' s,

= 0.000547 K3 l.!

P

= Pressurizer pressure, psi'g

= 2235 psig (Nominal RCS operating pressure)

P' S

= Laplace transform operator and ri(al) is a function of the ir.dicated difference between top and bottom detectors of the power range nuclear ion chamber; with gains to be selccted based on measured instrument response during plant startup tests sech that:'

2-

,e for qt - pb between -36 percent and +9.5 percent f (al) = 0 (where qt and qb l*

t (i) are percent RATED THERMA'. POWER in the top and bottom halves of the core respectively, and qt + qb is total TIIERMAL POWER in percent of RATED TilERMAL POWER).

for each percent that the magnitude of (qt - qb) exceeds -36 Percent, the aT trip (ii) setpoint shall be automatically reduced by 0.86 percent of its value RATED TilERMAL POWER, c

that the magnitude of (qt - qb) exceeds 19.5 percent, the AT (iii) for each perceri trip setpoint shall be automatically reduced by 0.98 percent of its value at RATED TilERMAL POWER.

The channel's maximum trip setpoint shall not exceed its computed trip point by more than 3.1 NOTE 2:

percent span.

~

(Westinghouse Proprietary Class 3)

[

TA.BLE 2.2-1 (continued).

REACTOR. TRIP SYSTEM INSTRUMENTATION TRIP SETPOINTS NOTATION 1t1 5 1 S 5)T - K [T(p,1 g) - I"] - f I^IIl 1'

3 7

NOTE 3:

Overpower aT ( p-3 ) (1 + T Ii dob 5 I Ft T S.I l+T I

6 2

S 6

3 7

1+T 5 g

1

• r S = as defined in Note 1 Where:

- as defined in Note 1 r,r2 g

g f--- = as defined in Note 1

- as defined in Note 1 T3 l

aTo

i. as defined in Note 1

(

= 1.091 K4 i

P cn

- 0.02/*F for increasing average temperature and 0 for decreasing average K5 temperature t,S 1

2 7 g-- g = The function generated by the lead-lag controller for Tavg dynamic compensation

[

= Time constant utilized in the lead-lag controller for Tavg. r7 - 10 secs.

. -.j jg 7

t I

g,-- g - as defined in Note 1

= as elehneil in Note 1 r 6

.f i

J.

(Westitighouse Proprietary Class 3)

TABLE 2.2-1 (continued)

REACTOR TRIP SYSTEM INSTRUMENTATION TRIP SETPOINIS NOTATION i

NOTE 3:

(continued)

= 1.00126/ *F 'for T > T" and K6 = 0 for T < I" j

K6 T

= as defined in Note 1 I"

= Indicated Tav9 at RATED TilERMAL POWER (Calibration temperature for AT 1

instrumentation, 1 688.2*F)

S

= as definedI'in'"Not'e 1 i

F (al)

= 0'for all al 2

.i NOTE 4:

The channel's maximum trip setpoint shall not exceed its computed trip point by more than 2.8 1

percent span.

• 3D

~

i i

4

- i 5

I i

1 b

5 i

v

(Westinghouse Proprietary Class 3) n TABLE 2.2-1 (continued)

REACTOR TRIP SYSTEM INSTRUMENTATION TRIP SETPOINT I40 TAT 10N

~

1*T S 16 EI l + L g) (T ) - T 3*

3 (P - P ) - f (aq)

NOTE 5:

Overtemperature N<Kg-K2 c

c j

Where:

K1

= 1.11 K2

= 0.01085 I

1+T 5 g

,T g - The function generated by the lead-lag controller for T dynamic compensation c

2

= Time constants-utilized in the lead-lag controller for T, Tg = 10 secs., r2 " 3 5"'S' i,T g

2 Tc

= Cold leg temperature *F I0

- 558.4*F (Nominal Tc at RATED TilERMAL POWER) c 30 K3

- 0.000578 03 P

= Pressuri,zer pressure, psig.

4 PO

= 2235 psig (Nominal RCS operating pressure)

S

= Laplace transform operator and f (aq) is a function of the indicated difference between the top pair and bottom pair af 1

detectors of the power range nuclear ion chambers; with gains to be selected based on measured instrument response during plant startup tests such that:

e e

n

(Westinghouse Proprietary Class 3) e TABLE 2.2-1 (continued)

REACTOR TRIP SYSTEM INSTRUMENTATION TRIP SETPOINT NOLAT10N l

fl0TE 5:

(continued) i (i) for qt - Ob between -35 percent and +10 percent, f t (aq) = 0 (where qt and qb are percent. RATED TilERMAL POWER in the top and bottom halves of the core respectively, and qt

• 4b is total IllERMAL POWER in percent of RATEl) IllEllMAL POWER).

3 o

16n

!1 (ii) for each percent.that the magnitude of (qt - 4b) exceeds -35 percent, the

' trip setpointashall be automatically reduced by 1.25 percent of its value at RATEll'

-~

TilERMAL POWER.

for each percent that the magnitude of (qt - 4b) exceeds +10 percent, the 163 (iii) trip setpoint shall be automatically reduced by 1.55 percent of its value at RATED TilERMAL POWER.

The channel's maximum trip setpoint shall not exceed -its computed trip point by more than 1.2 percent span.

NOTE 6:

16N 5, K4-f2 (aq)

NOTE 1:

Overpower Where:

K4 = 1.12 f (aq) = 0 2

The channel's maximum trip setpoint shall not exceed its computed trip point by more than 2.0 pe. ent span.

tiOTE 11:

o

[.% T'.

i I

i l

m

'(Westinghouse Proprietary Class 3)

,* o 2.2 LIMITING SAFETY SYSTEM SETTINGS INSTRUMENTATION SETPOINTS ENGINEERED S AFETY FEATURE ACTUATION SYSTEM 2.2.2 The Engineered Safety Feature Actuation System (ESFAS) instrumentation setpoints shall be set consistent with the Trip Setpoint values shown in Table 2.2-2.

APPLICABILITY: As shown for each channel in Table 3.3-3.

ACTION:

A.

W'ith an ESFAS instrumentation channel setpoint (for rack components only) less conservative than the value shown in the Allowable Values column of Table 2.2-2, determine that equation 2.2-1 is met for the affected channel:

I where:

the value from column 2 of Table 2.2-2 for the affected Z

=

' channel, the as [easured" value (in percent) of rack error for R

=

~

the affected channel, either the "as measured" value (in percent) of the S

=

sensor error, or the value in column S of Table 2.2-2 f~.r the affected channel, and the value from column TA of Table 2.2-2 for the affected TA

=

channel.

B.

With the requirements of Equation 2.2-1 not met, declare the channel inoperable and apply the applicable ACTION statement requirements of Specification 3.3.2.1 until the channel ~is restored to OPERABLE l

status with its trip setpoint adjusted consistent with the Trio l

Setpoint value.

l l

l i

^~

m- -

.M

(Westinghouse Proprietary Class 3) e TABLE 2.2-2 ENGINEERED SAFETY FEATURE ACTUAll0N SYSTEM INSIRUMENTATION TRIP SEIPOINTS Sensor Funtional Unit Total Allowance (TA) 2 Drif t (S)

Trip Setpoint Allowable Value 1.

SAFETY INJECTION, TURBINE TRIP AND FEEDWATER ISOLAil0N A. Manual Initiation

'IA NA NA NA NA B. Automatic Actuation Logic dA NA NA NA NA C. Containment Pre >sure - liigh 5.9 0.71 1.5

< 4.7 psig

< 5.6 psig a

D. Pressurizer Pressure - Low

!?.1 10.?!

1.5 I 1900 psig I 1089 psig

}

F. Olfferential Pressure

-I 600 psig i 585 psig (Note 1)

E. Steamline Pressure - Low 12.5 10.71 1.5

~

Between Steamlines - High 3.0 0.87 1.5 + 1.5 G. Steam Flow in Two Steamilnes

- 100 pst

-< 109 psi

- High 20.0 13.16 1.5 + 1.5

< A function defined as

< A function defined as Tollows:

6P correspondin9 Iollows: A.aP correspondl to 40% of i ull steam flow to 45.9% of full steam flo between 03 and 20% load and than a aP increasing hetween 01 and 20% load an then a aP :1ncreasing linearly to a aP corresponding to 1101 to a aP corresponding to 1(

of full steam flow at full of full steam flow at full load load H. Tavg - Low-Low 4.0 1.12 0.2

> f43*F

> 540.5*F

l. Tavg - Low-Low (T,16 )

7.0 1.01 0.2 I 553*F T 549.4*F N

c 2.

CONTAINMENT SPRAY A. Manual Initiation NA NA NA NA WA B. Automatic Actuation Logic NA NA NA NA NA C. Containment Pressure -

+

lii gh-Hig h 5.9 0.71 1.5

< 23.5 psig

< 24.4 psig 3.

CONTAINHENT ISOLATION A. Phase "A" Isolation

1. Manual NA NA NA NA NA t

2. From Safety injection Automatic Ac tuation Logic NA NA NA NA NA B. Phase "B" Isolation

1. Manual NA NA NA NA NA

2. Automatic Actuation NA NA NA NA NA

3. Containment Pressure -

High.High 5.9 0.71 1.5

< 23.5 psig

< 24.4 psig C. Containment ventilation isolation

1. Manual NA NA' NA hA NA

2. From Safety injection Automatic Actuation Logic NA NA NA NA NA

3. Containment Radioactivity

.(10)

(10)

(10)

(10)

High 110)

.w

(Westjnghouse Proprietary Class 3) l 4

TABLE 2.2-2 (Continued)

ENGINEERED SAFETY FEATURE ACTUATION SYSTIM INSTRUMENIATION 1 RIP SEIPOINTS Sensor Funtional Unit Total Allowance (TA)

Z Drif t (S)

Trip Setpo, int, Allowable Value 4.

STEAM LINE ISOLATION A. Manual hA NA NA NA NA D. Automatic Actuation Logic NA NA NA NA NA C. Containm.nt Pressure -

1;I gh-liigh 5.9 0.11 1.5

< 23.5 psig

< 24.4 psig D. Steamline Pressure - Low 12.9 10.71 1.5

{600psig

[585psig(NoteI)

E. Negative Steam Pressure I

Rate-High 8.0 0.5 0

< -100 psi

< -111.6 psi (Note 2) 5.

TURBINE TRIP AhD FEEDWAIER ISOL AT ION A. Steam Generator Water Level - Hf gh-High 5.0 2.18 1.5

< 751 ot rnarrow range

< 68.81 of narrow range Tnstruir nt span Tnstrument span 6.

AUXILI arf FEEDWATER A. Steam Generator Water Level - Low-Low 16.0 14.18 1.5

> 161 of narrow range

> 14.61 of narrow ras.ge Tnstrument span Tnstrument span B. Safety injection See I above (all 51 setpoints)

C. Station Blackout (10)

(10)

(10)

(10)

(10)

D. Trips of Main feedwater Pumps NA NA NA NA NA Note 1: Time constants utilized in the lead-lag controller for Steam Pressure-Low are tg 1 0 seconds and 12 < 5 seconds.

5 Note 2: The time constant utilized in the rate-lag Controller for Negative Steam Pressure Rate-Highs = 50 secs.

t l

l 4

A-12

(Westinchouse. Proprietary Class 3)

SAFETY LIMITS AND LIMITING SAFETY SYSTEM SETTINGS-i 2.2 LIMITING SAFETY SYSTEM SETTINGS REACTOR TRIP / ENGINEERED SAFETY FEATURE ACTUATION SYSTEM INTERLOCKS 2.2.3 The Reactor Trio System and Engineered Safety Feature Actuation System interlock satpoints shall be. consistent with the Trip Setpoint

' values shown in Table 2.2-3.

APPLICABILITY:

As shown for each channel in Table 1.3-5.

ACTION:

With a reactor trip system or engineered safety feature actuation system inter. lock setooint less conservative than the value shown in the Allowable value column.of Table 2.2-3 declare the channel inoperable and apply the applicable ACTION statement of Table 3.3-5 until the cnannel

-is restored to OPERABLE status with its trip setpoint adjuste'd consistent with the Trip Setpoint value.

~

4 O

t e

A-13

.,-a

(West'nghouse Proprietary Class' 3)

~

IABLE_ 2.2-3 3

REACTOR 1 HIP / ENGINEERED. SAFETY FEATURE ACillATION SYSTEM INTERLOCKS Functional Unit Trip Setpoint Allowable Velue 1.

Intermediate Range Neutron Flux - P-6

> 1 x 10-10 amps

> 6 x 10-11 amps 2.

Low Power Reactor P-10 input

< 10% of RATED

< 12.2% of RATED Trip Block - P-7 TilERMAL POWER TilERMAL P0k!ER P-13 input

< 10% Turbine

< 12.2% Turbine 4

impulse Pressure impulse Pressure i

Equivalent Equivalent 3

Power Range Neutron-

< 48% of RATED

<.50.2% of RATED 4

Flux - P-8 T)lERMAL POWER IllERMAL POWER 4.

Power Range Neutron

> 10% of RATED

> 7.8% of RATED Flux - P-10 IIIERMAL POWER IllERMAL POWER

>j; 5.

Pressurizer Pressure NOT - P-ll 1955 psig

< 1966 psig 6.

Pressurizer Pressure P-11 1955 psig

> 1944 psig 7.

Tavg - P-12

> 543*F

> 540.5'F j

8.

Turbine impulse Chamber

< 10% Turbine impulse

< 12.2% Turbine lamulse Pressure - P-13 Pressure Equivalent Pressure Equivalent l

9.

Reactor Trip - P-4 N.A.

N.A.

i 1

i l

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\\

w.

=

=

m So 1

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