Text

Proposed Revision to Tech Specs 3/4.2 to Allow Operation W/Exxon Nuclear Co Power Distribution Control Procedures
	ML17318A757
Person / Time
Site:	Cook
Issue date:	05/12/1980
From:	; INDIANA MICHIGAN POWER CO. (FORMERLY INDIANA & MICHIG
To:	;
Shared Package
ML17318A756	List: ML17318A755; ML17318A757;
References
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/4.2 POWER DISTRIBUTION LIMITS X'IAL FLUX DIFFERENCE AFD g.005

$ 00 t ~

INITING CONDITION FOR OPERATION

.2.1 The indicated AXIAL FLUX DIFFERENCE (AFD) shall be maintained within

+55 target band (flux difference units) about the target flux difference.

PPLICABILITY:

MODE "1 ABOVE 505 RATED THERMAL POWER*

CTION:

Mith the'indicated AXIAL FLUX DIFFERENCE outside of the +5Ã target band about the target flux difference and with THERMAL.

POMER:

K.-: Above 90K or.9xAPL** (whichever is less) of RATED THERMAL POMER, within 15 minutes:

a)

Either restore the indicated AFD to within the target band limits, or 2.

TPI Q.}

POWER OPERATION may continue provided:

b)

Reduce THERMAL power to less than 905 or.9xAPL (whichever is less) of RATED THERMAL POWER.

Between 50K and 90K or.9xAPL (whichever is less) of RATED ERMAL POWER:

2}

The indicated AFD has not been outside of the

+5% target band for more than. 1 hour1.157407e-5 days 2.777778e-4 hours 1.653439e-6 weeks 3.805e-7 months penalty Geviation cumulative during the previous 24 hours2.777778e-4 days 0.00667 hours 3.968254e-5 weeks 9.132e-6 months ,

'and The indicated AFD is within the limits'hown on Figure 3.2-1.

Otherwise, reduce THERMAL POWER to less than 50K of RATED THERMAL POMER within 30 minutes and reduce the Power Range Neutron Flux-High Trip Setpoints to <55Ã of RATED THERMAL POWER within the next'4 hours4.62963e-5 days 0.00111 hours 6.613757e-6 weeks 1.522e-6 months ..

b)

Surveillance testing of the Power Range Neutron Flux Channels may be performed pursuant to Specification 4.3.1.1.1 provided the indicated AFD is maintained 4

See Spec>a Test Exception 3.10.2

- APL.is the Allowable Power Level. defined in Section 3.2.6 6o<

POWER DISTRIBUTION LBIITS'IMITING CONDITION OF OPERATION Continued

~i within the limits of Figure 3.2-1.

A total of 16 hours1.851852e-4 days 0.00444 hours 2.645503e-5 weeks 6.088e-6 months operation may be accumulated with the AFD outside of the target band during this testing without penalty deviation.

-:- cj Surveillance testing of the APDMS may be performed

~':-

pursuant to Specification 4.3.3.6.1 provided the indi-

'cated AFD is maintained within the limits of Figure 3.2-1.

A total of 6 hours6.944444e-5 days 0.00167 hours 9.920635e-6 weeks 2.283e-6 months of operation may be accumu-.

'lated with the AFD outside of the target band during this testing without penalty deviation.

b.

THERMAL POWER shall not be increased above 90Ã or.9xAPL (which-ever is less) of RATED THERMAL POWER unless the indicated AFD is within the

+5% target band and ACTION 2.a) 1), above has been satisfied.

c.'

THERMAL POWER shall not be increased above 50% of RATED'HERMAL POWER unless the indicated AFD has not been outside of the +55 target band for more than 1 hour1.157407e-5 days 2.777778e-4 hours 1.653439e-6 weeks 3.805e-7 months penalty deviation cumulative during.the previous 24 hours2.777778e-4 days 0.00667 hours 3.968254e-5 weeks 9.132e-6 months .

SURVEILLANCE.REQUIREMENTS 4.2.1.1 The indicated AXIAL FLUX DIFFERENCE shall be determined to be within its limits during POWER OPERATION above 15K of RATED THEl@NL POWER by:

a.

Monitoring the indicated AFD for each OPERABLE excore channel:

1.

At least once per 7 days with the AFD Monitor alarm is OPERABLE, and 2.

At least once per hour for the first 24 hours2.777778e-4 days 0.00667 hours 3.968254e-5 weeks 9.132e-6 months after restoring

'he AFD Monitor Alarm to OPERABLE status.

b.

Monitoring and logging the indicated AXIAL FLUX DIFFERENCE for each OPERABLE excore channel at least once per hour for'he first 24 hours2.777778e-4 days 0.00667 hours 3.968254e-5 weeks 9.132e-6 months and at least once per 30 minutes thereafter, when the AXIAL FLUX DIFFERENCE Monitor Alarm is inoperable.

The logged values of the indicated AXIAL FLUX DIFFERENCE shall be assumed to exist during the interval preceding each logging.'/4 2-2

~.I l

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~

POWER DISTRIBUTION LIMITS

~J SURVEILLA CE REQUIREMENTS (Continued 4.2.1.2

.he indicated AFD shall be considered outside of its +5K target band when at least 2 of 4 or 2 of 3 OPERABLE excore channels are indicating the AFD to be outside the target, band.

Penalty deviation outside of the +5K target band shall be accumulated on a time basis of:

I a..A penalty deviation of 1 minute for each 1 minute of POWER OPERATION

outside of the target band at THERMAL POWER levels equal to or above 50Ã of RATED THERMAL POWER, and b.

A penalty deviation of ','minute for each 1 minute of POWER OPERATION outside of the target band at THERMAL POWER levels below 50K of.

RATED THERMAL POWER.

4.2.1.3 The target axial flux difference of each OPERABLE EXCORE channel shall be determined in conjunction with the measurement of F (Z), as defined in Section 4.2.2.2.c.

The provisions of Specification 4.II.4 are not applicable.

~3/4 2-3

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Figure 3.2-1 ALLOWA8LE OEVIATION FROM TARGET FLUX OIFFERENCE ecew gAJ/rx 3/4 p 4 I ~ I

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POWER DISTRIBUTION LIMITS'0 HEAT FLUX HOT CHANNEL FACTOR-F' LIMITING CONDITION FOR OPERATION v

3e2,.2 F (Z,a) shall be limited. by the following relationships:

[F (E,)3 FiI(Z,s)

< ~p (K(Z)]'for P

>> 0.6 v

- '-"= Fq(Z;x) c 2 [F~(E )] [K(Z)] for P

< 0.5

>> 'L THERMAL POWER RATED THERMAL POWER F~(E ) is the exposure dependent Fq limit for rod a and is defined on. Figure 3.2-3a for Exxon Nuclear fuel, Figure 3.2-3b for Westinghouse fuel and page 3/4 2-15.

E< is the maximum pellet exposure in rod a.

K{Z) is the function obtained from Figure 3.2-2 for a given core height location.

.F~ is defined as the F~(Z,a) with the smallest margin or the greatest excess of the limit.'PPLICABILITY:

MODE 1

ACTION:

Mith F~ exceeding its limit:.

a.

Co~ply with either of the following ACTIONS:

. 1.

Reduce THERMAL POWER at least 1% for each 1X F exceeds the

~

limit within 15 mimutes and'imilarly reduce t3e Power Range Neutron Flux-High Trip Setpoints within the next 4 hours4.62963e-5 days 0.00111 hours 6.613757e-6 weeks 1.522e-6 months ; Power Operation may proceed for up to a total of 72 hours8.333333e-4 days 0.02 hours 1.190476e-4 weeks 2.7396e-5 months ; subsequent POWER OPERATION may proceed provided the Overpower hT Trip Setpoints have been reduced at least

15. for each lX f

exceeds the limit.

The Overpower aT Trip Setpoint reduction ska11 be performed with the reactor subcritical.

.2.

Reduce THERMAL POWER as necessary to meet the limits of Speci-fication 3.2.6 using the APDMS with the latest incore map and updated R.

b.

Identify and correct the cause of the out of limit condition prior to increasing THERMAL POWER; THERMAL POWER may then be increased provided F~ is demonstrated through incore mapping to be within its

'imit.

3/4 2-5

'I h

~ ~

h POWER DISTRIBUTION LIMITS SURVEILLANCE RE UIREMENTS h

~ ~

hl KZ.Kl-4.2.2.2 ae b.

Ce e provisions of Specification 4.0.4 are not applicable.

for P <.5 F (Z,a) shall be determined to be within its l.imit by:

~

s)ng the movable incore detectors to obtain a power distribution map at any THERMAL POWER greater than 5X of RATED THERMAL POWER..

. Increasing the measured F~(Z,a) component of the power distribution map by. 35 to account for manufacturing tolerances and further increasing the value by 5X to account for measurement uncertainties.

Satisfying the following relationship at the time of the target flux determination.

FL(Z)

F~(Z) <<

~><

Z

[K(Z)]/[Y(Z)]

for P >.5

'\\

. 2F (Z)

Fi)(Z) << ~p Z

[K(Z)3/L'g(Z))

where:

F~(Z)..=

F~(Z,a) at a for which

~

F (Z,E) is a maximum F~(Z)

=

F~(E )

at a for which F (Z,a) is a maximum Fi)(Z) and Fg(Z) are functions of core height, Z, and correspond at each Z to the rod a for which 's a maximum at that Z.

T E V(Z) is'he function defined in Figure 3.2-3, K(Z) is defined in

.Figure 3.2-2, T{E) is defined in Figures 3.2-3a and 3.2-3b, P is the fractio'n of RATEO THERMAL POWER.

Ep{Z} is an uncertainty

~

factor to account for the reduction in the Fq(E

) curve due to

. an accumulation of exposure prior to the next flux map.

Ep(Z)

= 1.00 for T{E) = 1.0 or T{E) =.846 Ep(Z)

=

1 + L.014 x F~(Z)] for 1.0

> T(E)

>.846 d.

Measuring F~(Z,a) in conjunction with a target flux difference determination, according to the following schedule:

3/4 2-6

s POWER DISTRIBUTION LIMITS'0

~

'I SURVEILLANCE RE UIREMENTS I..Upon achieving equilibrium conditions after exceeding by 10% or more of RATED THERMAL POWER, the THERMAL POWER at which F~(Z,a)

.was.last determined*, or 2..

At least once per 31 effective full power days, whichever occurs.'irst.

'During power escalation at the beginning of each cycle, the design target may be used until a power level for extended operation has been achieved.

erne Mith successive measurements indicating an increase in peak pin

power, FgH, with exposure, either of the following additional actions"chal:1 be taken.

F)4(2) shall be increased by 2X over that specified in 4.2.2.2.c, or

'F {2) shall be measured and a target axial flux difference re-ektabiished at least once per 7 effective full power days until 2 successive maps indicate that the peak pin power, F~, is not i'ncrea sing.

f.

With the relationships specified in (c) above not being satisfied

'either of the following actions shall be taken:

2.

Place the core in an equilibrium condition where the limit in (c) is satisfied and remeasure the target axial flux difference.

Comply with the requirements of Specification 3.2.2 for F (Z,)l)

.exceeding its limit by the percent calculated with the fo)lowing expression.

F (Z) x V(Z)xEp(Z) max. over Z of F (E)

~p x [Y(2)]

x100 P ).5 g.

The limits specified in (c) and (f) above are not applicable in the following.core plane regions:

Lower core region 0 to lOX inclusive.

2.

Upper core region 90K to 100K inclusive.

4.2.2.3 When using the movable incore detectors to obtain a power distribution

map, an overall measured F (Z,R) shall be obtained from the map and increased by 3X to account for manufacturing tolerance and further increased by 5% to account for measurement uncertainty.

3/4 2-7

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conE IIF.IGIII {r-Tl FIGUAE 3.2-2 K{Z)NOf'IMALIZEDF~ (Z)

OF COfIE IIEIGIIT AS A FUNCTION a i

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Figure 3.2-3 V(Z) As A Function Of Core Height 3/4 2-8(a)

POWER DISTRIBUTION LIMITS NUCLEAQ ENTHALPY HOT CHANNEL FACTOR - F ~

, ~

LIMITING CONDITION FOR OPERATION I

I 3.2.3 F

H shall be limited by the following relationship:

C F~H <1.51 [1.0 + 0.2 (1-P))

// '*

P THERMAL POWER RATED, THERMAL POWER APPLICABILITY:

MODE 1'..-

I ACTION:

s With F<H exceeding its limit:.

a.

Reduce THERMAL POWER to less than 50K of RATED THERMAL POWER within 2 hours2.314815e-5 days 5.555556e-4 hours 3.306878e-6 weeks 7.61e-7 months and reduce the Power Range Neutron Flux-High Trip Setpoints to

< 55K of RATED THEPML POWER within the next 4

hours, b.

Demonstrate thru in-core mapping that P

is within its limit within 24 hours2.777778e-4 days 0.00667 hours 3.968254e-5 weeks 9.132e-6 months after exceeding the lim8 or reduce THERIIAL POWER to less than 55 of RATED THERIIAL POWER within the next 2

hours, and c.

Identify and correct the cause-of the out of limit condition prior to increasing THER~lALNPOWER; subsequent POWER OPERATION may proceed provided that F

is demonstrated through in-core mapping to be within its liiNt at a nominal 50Ã of RATED THERMAL POWER prior to exceeding this THEl51AL POWER, at a nominal 755 of RATED THERMAL POWER prior to exceeding this THERMAL power and within 24 hours2.777778e-4 days 0.00667 hours 3.968254e-5 weeks 9.132e-6 months after attaining 95K or greater RATED THERMAL POWER.

D. C.

COOK - UNIT 1 3/4 2"9

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POWER DISTRIBUTION L S

UADRANT POWER TILT RATIO LIMITING CONDITION FOR OPERATION 3.2.;4 THE qUADRANT POWER TILT-RATIO shall not exceed 1.02.

APPLICABILITY:

MODE 1

ABOVE 50% OF RATED THERMAL POWER~

ACTION:.

a.

Mith the QUADRANT POWER TILT RATIO determined to exceed 1.02

-but,<, 1.09':

Within 2 hour2.314815e-5 days 5.555556e-4 hours 3.306878e-6 weeks 7.61e-7 months s:

-= -ag

.Either reduce the QUADRANT POWER TILT RATIO to within its limit, or 1)

Reduce THERMAL POWER at least 3>> for each 1>> of indicated QUADRANT POWER TILT RATIO in excess of 1.0 and similarly reduce the Power Range Neutron F1ux-High Trip Setpoi'nts within the next 4 hours4.62963e-5 days 0.00111 hours 6.613757e-6 weeks 1.522e-6 months .

2.

Verify that the qUADRANT POMER TILT RATIO is within its 1imit within 24 hours2.777778e-4 days 0.00667 hours 3.968254e-5 weeks 9.132e-6 months after exceeding the limit or reduce THERMAL POWER to less than.50>> of RATED THERMAL'OWER within the next 2 hours2.314815e-5 days 5.555556e-4 hours 3.306878e-6 weeks 7.61e-7 months and reduce the Power Range Neutron Flux-High Trip setpoints to

< 55>> of RATED THERMAL POMER within the next 4 hours4.62963e-5 days 0.00111 hours 6.613757e-6 weeks 1.522e-6 months .

3.

.Identify and correct the cause of the out of limit con-dition prior to increasing THERMAL PGMER; subsequent PGMER OPERATION above 50>> of RATED THERMAL 'power may proceed provided that the QUADRANT POWER TILT RATIO is verified within its limit at least once per hour until verified acceptable at 955 or greater RATED THERMAL POWER; b.

Nth the QUADRANT POWER TILT RATIO determined to exceed 1.09 due to misalignment of either a shutdown or control rod:

T..

Reduce THERMAL POWER at least 3>> for each 15 of indf-cated QUADRANT POWER TILT RATIO in excess of 1.0, within 30 minutes.

2.

Verify that the QUADRANT POMER TILT RATIO is within its limit within 2 hours2.314815e-5 days 5.555556e-4 hours 3.306878e-6 weeks 7.61e-7 months after exceeding the limit or

~5p i

T t E

pei 3.1tl.2.

0. C.

COOK - UNIT l 3/4 Z-ll Amendment No. 28

E

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."POWER -DESTRIBUTION 1

HHITING CONDITION FOR OPERATION (Continued)

C ~

reduce THERMAL POWER to less than 50>> of RATED THERMAL POWER within the next 2 hours2.314815e-5 days 5.555556e-4 hours 3.306878e-6 weeks 7.61e-7 months and reduce the Power Range

-..;-=Neutron Flux-High trip Setpoints to

< 55" of RATED THERMAL POWER within the next 4 hours4.62963e-5 days 0.00111 hours 6.613757e-6 weeks 1.522e-6 months .

3.

Identify and correct the cause of the out of limit con-dition pr ior to ircreasing THERMAL POWER; subsequent POWER OPERATION above 50% of RATED THERMAL POMER may proceed

,--:- :provided that the QUADRANT POWER TILT RATIO is verified

~ wi,thin its limit at least once per hour until verified acceptable at 95" or greater RATED THERMAL POMER.

$'"e ~

/

Mith the QUADRANT POWER TILT RATIO determined to exceed 1.09 due to causes other than the misalignment of either a shut-down or control rod:

1..Reduce THERMAL POMER to less than 50" of RATED THERMAL POMER within 2 hours2.314815e-5 days 5.555556e-4 hours 3.306878e-6 weeks 7.61e-7 months and reduce the Power Range Neutron Flux-High Trip Setpoints to < 55>> of RATED THERMAL POWER within.the next 4 hours4.62963e-5 days 0.00111 hours 6.613757e-6 weeks 1.522e-6 months ;

,2.

Identify and correct the cause of the out of limit con-dition prior to increasing THERMAL POWER; subsequent PGWER OPERATION above 50" of RATED THERNAL POWER may proce d

provided that the qUADRANT POWER TILT RATIO is verified within its limit at least once per hour until verified at 95>> or greater RATED THERMAL POWER.

SURVEILLANCE REOUIREMENTS 4.2.4 The QUADRANT POWER TILT RATIO shall be determined to be within the limit above 50>> o, RATED THERMAL POWER by:

a ~

b.

c; fi Ca1culating the ratio at 'least once per 7 days when the alarm is OPERABLE.

Calculating the ratio at least. once per 12 hours1.388889e-4 days 0.00333 hours 1.984127e-5 weeks 4.566e-6 months during steady state operation when the alarm is inoperable.

Using the movable incor e detectors to determine the QUADRANT POWER TILT RATIO at least once per 12 hours1.388889e-4 days 0.00333 hours 1.984127e-5 weeks 4.566e-6 months when one Power Range Channel is inoperable and THEM'iAL POWER is

> 75 percent of RATED THERMnL POWER.

0.'.

COOK - UNIT 1

3/4 2-12 Amendment No.

28

0 f POWER DISTRIBUTION LIMITS DNB PARAMETERS f

LIMITING CONDITION FOR OPERATION 3.2.5 The following DNB related parameters shall be maintained within the limits shown on Table 3.2-1:

a ~

Reactor Coolant System T

Pressurizer Pressure c.

Reactor. Coolant System APPLICABILITY:

MODE 1

ACTION:

Total, Flow Rate With any of the above parameters exceeding its limit, restore the param-eter to withi'n its limit within 2 hours2.314815e-5 days 5.555556e-4 hours 3.306878e-6 weeks 7.61e-7 months or reduce THERMAL POWER to less than 5X of RATED THERMAL POWER within the next 4 hours4.62963e-5 days 0.00111 hours 6.613757e-6 weeks 1.522e-6 months .

SURVEILLANCE RE UIREMENTS 4.2.5.1 Each of the. parameters of Table 3.2-1 shall be verified to be within their limits at least once per 12 hours1.388889e-4 days 0.00333 hours 1.984127e-5 weeks 4.566e-6 months .

4.2.5.2 The Reactor Coolant System total flow rate shall be determined to be within its limit by measurement at least once per 18 months.

D. C.

COOK - UNIT 1 3/4 2-13

KK 1

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DNB PARAMETERS

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. Pr essurizer Pressure

> 2220 psia+

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> 1.350xl0. lbs/hr

> 0.9917xl0 lbs/h'ii.--'

'8

Total Flow Rate t

f KI,g C

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.-!-t m t not app ca e

ur ng est er a THERMAL POWER ramp inc'ease in excess o$ 5% RATED THEWS per minute or a THERMAL POWER step increase in excess of 10K RATED THERMAL POWER.

44

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4

POMER DISTRIBUTION LIMITS AXIAL POWER DISTRIBUTION I

~

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LIMITING C NDITION FOR OPERATION

'I

. 3.2.6 The -axial 'power distribution shall be. limited by the following relationship:

[F (Z)]

l.g5 K Z)

~ (R)) (PL).(1..03)

(1 + a.) (1.07}

F Mhere:

a; F.(Z) is the normalized axial power distribution from thimble

. j at core elevation Z.

b'.

PL is. the fraction of RATED THERMAL POWER.

'c.

K(Z)'s the function obtained from Figure 3.2-2 for a given core height location.

d.

R., for thimble j, is determined

.from at least n=6 in-core flux mkps covering the full configuration of permissible rod patterns above 10QX or APL (whichever is -'}ess) of. RATED THERIIAL POWER.

. in accordance with:

'Xg n i 1

R1J

~

Mhere:

FMeas/ T(E) ij Fi~

Z Ri

~ and its associated

a. may be calculated on a full core or a ij J

. limiting fuel batch basis as defined on page B3/4 3-3 of basis.

e.

F is the limiting total peaking factor in flux map i.

The

.Qia limiting total peaking factor is that factor with least margin

'to the F~(E) curve defined in Figure 3;2-3a for Exxon Nuclear Company fuel and in Figure 3.2-3b for Westinghouse fuel.

3/4 2-15

% 4 J ~

POMER DISTRIBUTION LIMITS p

LIM!TING CONDITION FOR OPERATION Continued T(E) is the ratio of the exposure dependent FQ(E) to 1.95 and is defined in Figure 3.2-3a for fuel supplied by Exxon Nuclear'Ccepany

. and.in Figure 3.2-3b for fuel supplied by Mestinghouse Electric

'orporation.

f.

[Fi'.(Z)JM is the maximum value of the normalized axial distri-bution at elevation Z from thimble j in map i which had a limiting

.. total measured peaking factor without uncertainties or densification allowance of FMeas.

Qia a~ is the standard deviation associated with thimble j, expressed as a fraction or percentage of R.,

and is derived from n flux maps from the relationship below, or 0.52, (2") whichever is greater.

n T 1=1 J

lj

.Rg 9-F is an uncertainty factor for Exxon fuel to account for the reduction in the F~{E) curve due to an accumulation of exposure prior to the next flux map.

This correction is only required when the T(E) for the limiting fuel segment is less than 1.0.

The following F factor shall apply:

for T(E)'

1.0 F

= 1.0 p

F

~ 1.0 + 0.005 x M

p for T(%)

< 1.0 where M is the number of effective full power w'eeks (rounded up to the next highest integer) since the last full core flux map.

The factor 1.07 is comprised of 1.02 and 1.05 to account for the axial power distribution instrumentation accuracy and the measure-ment uncertainty associated with F using the movable detector system respecti vely.

The factor 1.03 is the engineering bncertainty factor.

. 3/4 2-16

~"'<

~ f tI4 0

~ p P

POWER DISTRIBUTION LIMITS LIMITING CONDITION FOR OPERATION Continued APPLICABILITY: Node 1 above the percent of RATED THERMAL POWER indicated by ttt i

Iip.l'a K(z)

'PL = min over Z of x 100K p'>.5

~

Fq(Z,a) x V(Z) x Ep(Z) t where Fq(Z,a) is the measured'~(Z,a),

including a 3X manufacturing tolerance uncertainty and a

5X measurement uncertainty, at the time of target flux deter-mination from a power distribution map using the movable incore detectors.

ACTION:

a..

With a =F-(Z) factor exceeding [F.(Z)jS by

< 4 =percent reduce THERMAL POWER 1 perce~t for every percent by which the F.{Z) factor exceeds

. its limit within 15 minutes and within the next ~2 hours either reduce the F.(Z) factor to within i'ts limit or reduce THERMAL POWER to APL or leks of RATED THERMAL POWER.

r b.

With a F.(Z) factor exceeding IF.(Z)]S by > 4 percent, reduce THERMAL j

j S

POWER to APL or less of RATED THERMAL POWER within 15 minutes.

8

. The APDMS may be out of service:

-1) when incore maps are being taken as part of the Augmented Startup Test Program or

2) when surveillance for determining power distribution maps is being performed.

3/4 2-17

1 0

POWER DISTRIBUTION LIMITS l

SURVEILLANCE RE UIREMENTS 4.2.6.1 F (Z) shall be determined to be within'ts limit by:

as ither using the APDMS to monitor the thimbles required per pecification 3.3.3.6 at the following frequencies.

I.

At least ance per 8 hours9.259259e-5 days 0.00222 hours 1.322751e-5 weeks 3.044e-6 months , and 2.

Immediately and at intervals of 10, 30,'60, 90, 120, 240, and

. 480 minutes following:

a)

Increasing the THERMAL POWER above APL of RATED THERMAL POWER, or b)

Movement of control bank "D" more than an accumulated

. total of 5 steps in any 1 direction.

b.

Or using the movable incore detectors at the following frequencies when the APDMS is inoperable:

1.

At least once per 8 hours9.259259e-5 days 0.00222 hours 1.322751e-5 weeks 3.044e-6 months , and

2. -'t intervals of 30, 60, 90, 120, 240, and 480 minutes following:

a)

Increasing the THERMAL POWER above APL of RATED THERMAL POWER, or b)

Movement of control bank "D" more than an accumulated total of 5 steps in any 1 direction.

4.2.6.2 When the movable incore detectors are used to monitor F.(Z), at least 2 thimbles shall be monitored and an F.(Z) accuracy equivalent to that obtained from the APDMS shall be maintained.

3/4 2-18

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'igure 3.2 - 3b F+ Limit,F<(E), and NormaIized LimitT(E) as a Function of Peak Pellet Burnup for Westinghouse Fuel A

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D. C.

COOK - UNIT 1 sgp w r 3/4 2-2O Amendment Nn. Jg, 25

POWER DISTRIBUTION LIMITS

~ a BASES

~ J A1though it is intended that the plant will be operated with the AXIAL FLUX DIFFERENCE within the

+5% target band about the target flux difference, during rapid plant THERMAL POWER reductions, control rod motion will cause the AFD to deviate outside of the target band at reduced THERMAL POWER levels. This deviation will not affect the xenon redistribution sufficiently to change the envelope of peaking factors which may be reached on a subsequent return to RATED THERMAL POWER (with the AFD within the target band) provided the time duration of the deviation is limited.

Accordingly, a

1 hour1.157407e-5 days 2.777778e-4 hours 1.653439e-6 weeks 3.805e-7 months . penalty deviation limit cumulative during the previous

.24 hours2.777778e-4 days 0.00667 hours 3.968254e-5 weeks 9.132e-6 months is provided for operation outside

. of the target band but within the limits of Figure 3.2-1 while at THERMAL POWER levels above 50/ of RATED THERMAL POWER.

For THERMAL POWER levels below 504 of RATED THERMAL POWER, deviations of the AFD outside of the target band are less significant.

The penalty of 2 hours2.314815e-5 days 5.555556e-4 hours 3.306878e-6 weeks 7.61e-7 months actual time reflects this reduced significance.

Provisions;for monitoring the AFD on an automatic basis are der ived from the plant process computer through the AFD Monitor Alarm.

The computer deter-mines the 1 minute average o'f each of the OPERABLE excore detector outputs and provides an alarm message if the AFD for at least 2 of 4 or 2 of 3 OPERABLE excore channels are outside the target band and the THERMAL POWER is greater than 905 or.9 x APL of RATED THERMAL POWER (whichever is less).

During opera-tion at THERMAL POWER levels between 15K and 90K or.9 x APL RATED THERMAL POWER (whichever is less),

the computer outputs an alarm:message when the penalty deviation accumulates beyond the limits of 1 hour1.157407e-5 days 2.777778e-4 hours 1.653439e-6 weeks 3.805e-7 months and 2 hours2.314815e-5 days 5.555556e-4 hours 3.306878e-6 weeks 7.61e-7 months , respec-tively..

The upper bound limit (90K or.9 x APL of RATED THERMAL POWER (whichever is less))

on AXIAL FLUX DIFFERENCE assures that the F (Z,s) envelope of 1.95 times K(Z) x T(E) is not exceeded during either norma) operation or in the event of xenon redistribution following power changes.

The lower bound limit (505 of RATED THERMAL POWER) is based on the fact that at THERMAL POWER levels below 50K of RATED THERMAL POWER, the average linear heat generation rate is 4 of its nominal operating value and below that value, perturbations in local-ized flux distributions cannot affect the results of ECCS or DNBR analyses in a manner which would adversely affect the health and safety of the public.

Figure B 3/4 2-1 shows a typical monthly target band near the beginning of core life.

8 3/4 2-2

i ~ ~

~

t 0

~e, POMER OISTRIBUTION LIMITS

~,

BASES 3/4.2e5 ONB PARAMETERS

'The limits on the ONB related parameters assure that each of the para-

- 'eters are maintained within the normal. steady state envelope of operation assumed in the transient and accident analyses.

The limits are consistent with the initial FSAR assumptions and have been analytically demonstrated

~

adequate to maintain a minimum ONBR of 1.30 throughout each analyzed transient.

The 12 hour1.388889e-4 days 0.00333 hours 1.984127e-5 weeks 4.566e-6 months periodic surveillance of these parameters thru instrument readout is sufficient to ensure that the parameters are restored within their 1imits following load changes and other expected transient operation.

The 18 month periodic measurement of the RCS total flow rate is adequate to detect flo'w degradation and ensure correlation of the flow indication channels with measured flow such that the indicated percent flow will provide sufficient verification of flow rate on a 12 hour1.388889e-4 days 0.00333 hours 1.984127e-5 weeks 4.566e-6 months basis.

3/4.2.6 AXIAL POWER DISTRIBUTION The limit on axial power distribution ensures that F " will be controlled and monitored on a more exact basis through use of the AP)NS when operating above APL of RATED THERMAL POWER.

This additional limitation on F

is neces-sary in order to provide assurance that peak clad temperatures will remain below the ECCS acceptance criteria limit of 2200'F in the event of a LOCA.

The unit may operate with fuel assemblies supplied by the Exxon Nuclear Company and by Mestinghouse Electric Corporation.

An F limit has been specified for each of these 2 fuel types.

B 3/4 2-6

S bi

'4

ML17318A757

Text

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