Text

Proposed Tech Specs 3/4.2. & 3.4.2 Re Power Distribution Limits
	ML17319B443
Person / Time
Site:	Cook
Issue date:	07/12/1982
From:	; INDIANA MICHIGAN POWER CO. (FORMERLY INDIANA & MICHIG
To:	;
Shared Package
ML17319B442	List: ML17319B441; ML17319B443;
References
	NUDOCS 8207210238
	Download: ML17319B443 (20)
	v • d • e

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3.4.2 POWER 0!STRIBU N LIMITS AXIAL FLUX DIFFERENCE AFO LIMITING CONDITION FOR OPERATION 3.2. 1 The indicated AXIAL FLUX DIFFERENCE (AFD) shall be maintained within the target band te5L or e35 flux difference units) about a target flux difference.

APPLICABILITY: MODE 1

above 50%

RATED THERMAL POWER*

I ACTION:

'a

~

With the indicated AXIAL'LUXDIFFERENCE outside of the target band about the target flux difference and with THERMAL POWER:

l.

Above 90% or 0.9 x APL** (whichever is less) of RATED THERMAL POWER, within 15 minutes:

a)

Either restore the indicated AFD to within the target band limits, or b)

Reduce THERMAL POWER to less than 90% or 0.9 x APL (whichever is less) of RATED THERMAL POWER.

2.

Between 50% and 90% or 0.9 x APL (whichever is less) of RATED THERMAL POWER:

a)

POWER OPERATION may continue provided; 1)

The indicated AFO has not been outside of the 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 , and 2)

The indicated AFD is within the limits shown cn Figure 3.2-1.

Otherwise, reduce THERMAL POWER to less than 50/ o RATED THEPMAL POWER within 30 minutes 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 .

I b)

Surveillance testing of the Power Range Neutron Flux Channels may be performed pursuant to Specification 4.3. l. 1. 1 provided the indicated AFD is maintained 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 AFO outside of the target band during this testing uithout penalty deviation.

See Special Test Exception

3. 10.2

- APL is the Allowable Power Level defined in Specification 3.2.6.

D.

C.

COOK - UNIT 1

3/4 2-1 Amendment No.

82072l0238 820712 PDR ADGCK 05000315 qP,

--.- PDg

POWER DISTRIBUTION LIMITS LIMITIiNG CONDITION FOR OPERATION (Continued) c)

Surveillance testing of the APDMS may be performed pursuant to Specification 4.3.3.6.1'provided the indicated 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 accumulated with the AFD outside of the target band during this testing without penalty deviation.

b.

THERMAL POWER shall not be increased above 90il or 0.9 x APL (whichever is less) of RATED THERMAL POWER unless the indicated AFD is within the target band and ACTION 2.a) 1),

above has been satisfied.

c.

THERMAL POWER shall not be increased above 504 of RATED THERMAL POWER unless the indicated AFD has not been outside of the target band for more than 1 hour1.157407e-5 days 2.777778e-4 hours 1.653439e-6 weeks 3.805e-7 months penalty devi ation cumulative during the previous 24 hours2.777778e-4 days 0.00667 hours 3.968254e-5 weeks 9.132e-6 months .

During power reductions using control rods, the reporting requirements of Specification 6.9. 1.9 shall not, apply provided ihe action items above are satisfied.

SURVE ILLAilCE REQUIREi~lENTS 4.2. 1. 1 The indicated AXIAI FLUX DIFFERENCE shall be determined to be within its limits during POWER OPERATION above 15/ of RATED THERMAL POWER by:

a.

Monitoring the indicated AFO for each OPERABLE excore channel:

At least once per 7 days when the AFD iMonitor 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 the AFO Monitor Alarm to OPERABLE status.

b.

Monitoring and logging the indicated AXIAL FLUX DIFFERENCE for each OPERABLE excore channel at least once per hour or the 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 sha11 be assumed to exist during the interval preceding each logging.

D.

C.

COOK - UNIT 1 3t4 2-2 Amendment i'io.

POWER DISTRIBUTION LIi~lITS SURYEILLANCE REQUIREi~1ENTS Continued) 4.2.1.2 The indicated AFD shall be considered outside of its 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 target band shall be accumulated on a time basis of:

a.

A penalty deviation of one minute for each one minute of POWER OPERATION outside of the target band at THERMAL POWER levels equal to or above 50!. of RATED THERMAL POWER, and b.

A penalty deviation of one-half minute for each one minute of POWER OPERATION outside of the target band at THERMAL POWER levels between 154 and 50/ of RATED THERMAL POWER.

4.2.1.3 The target axial flux difference of each OPERABLE excore channel shall be determined in conjuction with the measurement of FQ (Z) as defined in Specification 4.2.2.2.c.

The provisions of Speci-e fication 4.0.4 are not applicable.

4.2. 1. 4 The axial flux difference target band about the target axial flux difference shall be determined in conjunction with the measurement of FQ (Z) as defined in Specification 4.2.2.2.c.

The allowable values of the t1 target band are +5; or +3!.

Redefinition of the target band from +3 to

+5>!

between determination.- of the target axial flux difference is allowed when appropriate redefinitions of APL are made.

Redefinition of the target band from +5! to +3% is allowed only in conjunction with the determination of a new target axial flux difference.

The provisions of Specification 4.0.4 are not applicable.

0.

C.

COOK - UNIT 1

3/4 2-3 Amendment No.

~

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...0 eration.:

p i......

l Una'cceptable;...,.....::.:

!...;:I:...,:.'.'.:

Unacceptable Operation.:

.g-;10,90 ':!: !: +10

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80 60

-8,90).:

. (..8,90.)

+'3~ Target"

='- Band

acceptab1a

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10 20 Deviation from Target Flux Difference F 1 <J u!'C 3. 2-1 Rllo.table Deviation i'ro!!! Target Flux Ci< le! e!!ce 0.

C.

COOK - Unit 1

3/4 2-4 Amendment

!qo.

POWER 0ISTRISUTION LIMITS.

SURVEILLANCE RE UIREME 4.2.2.1 The provisions of Specification 4.0.4 are not applicable.

4.2.2.2 F (Z,a) shall be determined to be within its limit by:

a.

Using the movable incore detectors to obtain a power distribution map at any THERMAL POWER greater than 51 of,'RATED THERMAL POWER.

b.

Increasing the measured F~(Z,2) component of the power distribu-tion map by 3X to account for manufacturing tolerances and further increasing the value by 55 to ace%(Iint for measurement uncertainties.

Thews product defi'ned is F~(.Z).

c.

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

L F (2)

< ~>+ 2

[K(Z)]/[Y(2)]

for F

>.5 M

2FO(Z)

F()(2)

< ~E 2

[K(Z)]f [Y(2))

where:

F~(Z)

= F~(Z,2) at a for which M

FO(Z,)l,)

is a maximum F~(Z)

= F~(E

)

at a for which L

L FO(Z,a) is a maximum M

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

T E s V(Z) is the function de ined in Figure 3.2-3 which corresponds to the iarget band, 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 fraction d RATED THERMAL POWER.

Ep(Z} is an uncertainty factor to account for the reduction in the FO(Ea) curve due to an accumulation of L

exposure prior to the next flux map.

E Z =10 for P

<.5 p(

)

Ep(Z)

= 1.0

+ I Ep(L)

= 1.0

+

0 E

< 1.7.62 17.62<

E

< 34.5 0040 x F'(Z) 0093 x F~(2) 34.5 E

< 42.2 d.

Measuring F (Z,2,) in conjunction with a target flux difference and target IIand determination, according to the following schedule:

0.

C.

COOK - UNIT 1

3/4 2-6 Amendment No.

POWER DISTRI8UTION LIMITS SURVEILLANCE RE UIREMEi Upon achieving equilibrium conditions after exceeding by 10% or more of RATED THERMAL POWER, the THERMAL POWER at which F~(Z) was last determined+,

or At least once per 31 effective full power days, which-ever occurs first.

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.

e.

With successive measurements indicating an increase in peak pin power, Fb,H, with exposure, either of the following additional actions shall be taken.

1.

F (Z) shall be increased by 2/ over that specified in M

4.2.2.2.c, or 2.

F~(Z) shall be measured and a target axial flux M

difference reestablished at least once per 7 effective full power days until 2 successive maps ind'icate that the peak pin power, F H, is not increasing.

With the relationship specified in 4.2.2.2.c not being satisfied either of the following actions shall be taken:

1.

Place the core in an equilibrium condition where the limit in 4.2.2.2c is satisfied and remeasure the target axial flux difference.

Z.

Comply with the requirements of Specification 3.2.2 for F (Z,lE,) exceeding its limit by the percent calculated with the following expression with Y(z) corresponding to the target band.

FO(Z) x Y(Z)xEp(Z) max. over Z of

- I F<(E,)

Op '

CK(Z)j xlOOP >.5 g.

The limits specified in 4.2.2.2.cand 4,2,2.2.f above are not applicable in the following core plane regions:

1.

Lower core region 0 to 10% inclusive.

Z.

Upper core region 90% to 100% inclusive.

4.2.2.3 When Fq(Z,2) is measured for reasons other than meeting the requirements of Specification 4.2.2.2, an overall measured F~(Z,z) shall be obtained from a power distribution map and increased by 3

~ to account for manufacturing tolerances and further increased by 5% to account for measurement uncertainty.

D.

C.

COOK - UNIT 1

3/4 2-?

Amendment No.

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.,I +35 T,arget,'Band i

iMo 108

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(9.25, 1:OS).

'.06 1.0<

1.02 1.00 0

Axial Height (ieet)

Fight>>>> 3.2-3

'l(7) hs A Fnnction or" Core )leigh'0 12 0.

C.

COOK - Unit 1

3/4 2-S(a)

Amendment i'Io.

POWER DISTRIBUTION L S

LIMITING CONDITION FOR OPERATION Continued APPLICABILITY:

Mode 1 above the percent of RATED THERMAL POWER indicated by the relatsonship.P FO E

K Z IDOL L

APL = min over Z of-F Z 2 x V Z

x Ep Z

q where F~(Z,a) is the measured F~(Z,a), including a

3X manufacturing tolerance uncertainty and a 5/ measurement uncertainty, at the time of target, flux determination from a power distribution map using the movable incore detectors.

Y(Z) is the function defined in Figure 3.2-3 which corresponds to the target band.

The above limit is not applicable in the following core plane region.

1)

Lower core region 05 to 10/ inclusive.

2)

Upper core region 90'5 to 100% inclusive.

ACTION:

With a F.(Z) factor exceeding

[F (Z)jS by

< 4 percent, reduce J

J THERMAL POWER 1 percent for every percent by which the F.(Z)

J factor exceeds its limit within 15 minutes and within the next 2 hours2.314815e-5 days 5.555556e-4 hours 3.306878e-6 weeks 7.61e-7 months either reduce the F.(Z) factor to w.'thin its J

limit or reduce THERMAL POWER to APL or less of RATED THERMAL POWER.

b.

With a F.(Z) factor exceeding

[F (2)jS by

> 4 percent, J

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

The APDMS may be out of service:

1) when incore maps are being taken as part of the Augumented Startup Test Program or 2) uhen surveillance

,or determining power distribution maps is being pe.formed.

D.

C.

COOK - UNIT 1

3/4 2-17 Amendment No.

POWER DISTRIBUTION L TS BASES Although it is intended that the plant will be operated with the AXIAI FLUX DIFFERENCE within the 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 re-duced 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 devi-ation is limited.

Accordingly, a

1 hour1.157407e-5 days 2.777778e-4 hours 1.653439e-6 weeks 3.805e-7 months penalty deviation limit cumu-lative 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 505 of RATED THERMAL POWER.

For THERMAL POWER levels below 50K of RATED THERMAL POWER, deviations 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 signifigance.

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

The computer determines the one minute average of each of the OPERABLE excore detector outputs and provides an alarm message if the AFD for at least 2 of' or 2 of 3 OPERABLE excore channels are outside the target band an) the THERMAL POWER is greater than 90/ or 0.9 x APL of RATED THERMAL POWER (whichever is less}.

During operation at THERMAL POWER levels between 15/ and 90ll or 0.9 x APL of RATED THERMAL POWER (which-ever is less),

the computer outputs an alarm message when the penalty deviation accumulates beyond the limits of I hour and 2 hours2.314815e-5 days 5.555556e-4 hours 3.306878e-6 weeks 7.61e-7 months , respectively.

The upper bound limit (90% or 0.9 x APL of RATED THERMAL POWER (which-ever is less))

on AXIAL FLUX DIFFERENCE assures that the F (Z,a) envelope of 2.04 times K(Z} x T(E

) is not exceeded during either normal operation or in the event of xenon redistribution following power changes.

The lower bound limit (50Ã of RATED THERMAL POWER) is based on the fact that at THERMAL POWER levels below 50; of RATED THERMA POWER, the average linear heat generation rate is half of'ts nominal operating value and below that value, per turbations in localized flux distributions cannot affect the results o

ECCS or DNBR analyses in a manner which would adversely a feet the health and safety o

the public.

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

The bases and methodology for establishing these limits is presented in topical report XN-NF-77-57.

"Exxon Nuclear Power Distribution Control for PWR's - Phase II" and Supplements 1 and 2 to that report.

D.

C.

COOK - UNIT 1

B 3/4 2-2 Amendment No.

ATTACHMENT NO.

3 TO AEP:NRC:0710 REVISED TECHNICAL SPECIFICATION PAGES FOR D. C.

COOK UNIT NO.

2

3/4.2 POWER DISTR TION LIMITS AXIAl FLUX DIFFERENCE AFD)

LIMITING CONDITION FOR OPERATION 3.2.1 The indicated AXIAL FLUX DIFFERENCE (AFD} shall be maintained within the target band

(+5Ã or +35 flux difference units) about a target flux difference.t APPLICA8ILITY:

MODE 1 above 50/

RATED THERMAL POWER~

ACTION:

a ~

With the indicated AXIAL FLUX DIFFERENCE outside of the target band about the target flux difference and with THERMAL POWER:

l.

Above 90% or 0.9 x APL*~ (whichever is less) of RATED THERMAL POWER, within 15 minutes:

a) b}

Either restore the indicated AFD to within the target band 1 imits, or Reduce THERMAL POWER to less than 90/ or 0.9 x APL (whichever is less) of RATED THERMAL POWER.

2.

8etween 504 and 90". or 0.9 x APL (whichever is less) of RATED THERMAL POWER:

a)

POWER OPERATIOl'l may continue provided:

1)

The indicated AFD has not been outside of the 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 Z4

hours, and 2)

The indicated AFD is within the limits shown on Figure 3.2-1.

Otherwise, reduce THERMAL POWER to less than 50',l of RATED THERMAL POWER withi n 30 minutes 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 .

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 within the limit 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 out-side of the target band during this testing without penalty deviation.

See Special Test Exception 3. 10.2 APL is the Allowable Power Level defined in Specification 3.2.6 D.C.

COOK - Unit Z 3/4 2-1 Amendment No.

POWER DISTRIBUTION L Ii~1ITS ACTION:

{Continued) c)

Surveillance testing of the APDblS may be performed pursuant to Specification 4.3.3.7.1 provided the indicated 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 accumulated with the AFD outside of the target band during this testing without penalty deviation.

b.

C.

d.

THERMAL POMER shall not be increased above 90/ or 0.9 x APL (whichever is less) of RATED THERMAL PO'iJER unless the indicated AFD is within the target band and ACTION 2.a) 1),

above has been satisfied.

I THERMAL PO~rJER shall not be increased above 50K of RATED THERMAL POWER unless the indicated AFD has not been outside of the 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 .

During power reductions using control rods, the reporting requirements of Specification 6.9. 1.9 shall not apply provided the action items above are satisfied.

SURVE ILLANCE REQUIREtiENTS 4.2.1.1 The indicated AXIAL FLUX DIFFERENCE shall be, determined to be within its limits during POWER OPERATION above 15K of RATED THERIlAL POWER by:

a.

t'enitoring the indicated AFD for each OPERABLE excore channel:

1.

At least once per 7 days when the AFO IA{onitor Alarm is

OPERABLE, and 2.

At least once per hour for the first Z4 hours after restoring the AFD Nonitor Alarm to OPERABLE status.

Yonitoring and logging the indicated AXIAL FLUX DIFFERENCE for each OPERABLE excore channel ai least once per hour for the 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 tIonitor Alarm is inoperable.

The logged values of the indicated AXIAL FLUX OIFFFRENCE shall be assumed to 'exist during the interval preceding each logging.

0.

C.

COOK - UNIT 2 3/4 2-2 Amendment No.

POWER DISTRIBUTION LIMITS SURYEILLANCE RE UIREMENTS continued 4.2.1.2 The indicated AFD shall be considered outside of its 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 target band shall be accumulated on a time basis of:

a.

A penalty deviation of one minute for each one minute of POWER OPERATION outside of the target band at THERMAL POWER levels equal to or above 50% of RATED THERMAL POWER, and b.

A penalty deviation of one half minute for each one minute of POWER OPERATION outside of the target band at THERMAL POWER levels between 15/ and 50% 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 Specification 4.2.2.2.c.

The provisions of Specification 4.0.4 are not applicable.

4.2. 1.4 The axial flux difference target band about the target axial flux difference shall be determined in conjunction with the measurement of F~(z) as defined in Specification 4.Z.2.2.c.

The allowable values of the target band are

+5% or +3%.

Redefinition of the target band from +3% to +5%

between determinations of the target axial flux difference is allowed when appropriate redefinitions of APL are made.

Redefinition of the target band from +5% to +3% is allowed only in conjunction with the determination of a

new target axial flux difference.

The provisions of Specification 4.0.4 are not applicable.

D.

C.

COOK - Unit 2 3/4 2-3 Amendment No.

5 O

C I

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I-100 x

80 Un accept'ab 1 e Operation

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t... '.:".'...I'-.I.,:!...i-,.:... I...

Unacceptabl e'-

era

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(,=9..'90):

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60 O

40 I

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+3K-Ta rge't' Band

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10 20 30 De'elation froHl Target Flux Difierence Fit~url 3.2-1 Alloiv~blt. Deviation I'> om Ta> get Flux Dil fer I'.nice D.

C.

COOK - Unit 2 3/4 2-4 Amendment ho.

POWER DISTRIBUTION LIMITS SURVEILLANCE RE UIREMENTS 4.2.2.1 4.2.2.2 a 0 b.

C.

The provisions of Specification 4.0.4 are not applicable.

F (Z) shall be determined to be within its limit by:

Using the movable incore detectors to obtain a power distribution map at any THERMAL POWER greater than 5/ of RATED THERMAL POWER.

increasing the measured p (Z) component of the power distribution map by 3y to account for,anufacturing tolerances and further increasing the value by; 5% to account for measurement uncertainties.

This pri)duct defined is.F~(Z).

Satisfying the following relationship at the time ot the tar get flux determination.

Fq(Z) p

[K(Z)7 /

[V(Z)j forP >.5 F'Z)

< 3.98

[K(Z)] /

[V(Z)3 where for P<.5 F~(Z) is the measured total peaking as a function of core

height, V(Z) is the function defined in Figure 3.2-3 which corresponds to the target band, K(Z) is defined in Figure 3.2-2, P is the fraction of RATED THERMAL POWER.

d.

Measuring F (Z) in conjunction with the target flux difference and target band determination, according to the foliowing scheduie:

2.

Upon achieving equilibrium conditions after exceeding by 105 or more of RATED THERllAL POWER, the THERMAL POWER at which F~(Z) was last determined+,

or At least onc per 31 effective full power days, whichever occurs first.

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.

D.

C.

COOK - Unit 2 3/4 2-6 Amendment No.

0 POWER DISTRIBUTION LIMITS SURVEILLANCE RE UIREMENTS e.

With successive measurements indicating an increase in peak pin power, FdH, with exposure, either of the following additional actions shall be taken.

2.

F~(Z) shall be increased by 2% over that specified in M

4.2.2.2.c, or F~(Z)'hall be measured and a target axial flux difference reestablished at least once per 7 effective full power days until 2 successive maps indicate that the peak pin

power, F>H, is not increasing.

f.

With the relationship specified in 4.2.2.2.c not being satisfied either of the following actions shall be taken.

1.

Place the core in an equilibrium condition where the limit in 4.2.2.2.c is satisfied and remeasure the target axial flux dif erence.

2.

Comply with the requirements of Specification 3.2.2 for F~(Z) exceeding its limit by the percent calculated with the following expression with V(Z) corresponding to the target band:

i FM(Z) x V(Z) max. over Z of 1

';" x {K(Z)]

x 100 p >.5 g.

4.2.2.3 The limits specified in 4.2.2.2.'c and 4.2.2.Zf above are not applicable in the following core plane regions:

i.

Lower core region 0 to 10% inclusive.

2.

Upper core region 90" to 3,00% inclusive.

When F~(Z) is measured for reasons other than meeting the requirements of Specification 4.2.2.2, an overall measured F~(Z) shall be obtained from a power distribution map and increased by 3% to account for manufacturing tolerances and further increased by 5% to account for measurement uncertainty.

0.

C.

COOK - Unit 2 3/4 2-7 Amendment No.

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COOK - Unit 2 2-S(a)

Amendment i'io.

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POWER DISTRIBUTION LI S

'IMITING CONDITIONS FOR OP'ERATION (Continued)

a. is the standard deviation associated with thimble J, expressed J

as a fraction or percentage of R.,

and is derived from n flux maps from the relationship below, or 0.02, (2%) whichever is greater.

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 respectively.

The factor 1.03 is the engineering uncer tainty factor.

APPLICABILITY:

Mode 1 above the percent of RATED THERMAL POWER indicated by the relationship.

8 APL = min over Z of x 100%

where F~(Z) is the measured F~(Z), including a

3% manufacturing tolerance uncertainty and a 5.'easurement uncertainty, at the time of target flux determination from a power distribution map using the movable incore detectors.

V(Z) is the function defined in Figure 3.2-3 which corresponds to the target band.

The above limit is not applicable in the following core plane regions.

1)

Lower core region 0% to 10% inclusive.

2)

Upper core region 90% to 100% inclusive.

Aci!OH:

a ~

With a F (Z) factor exceeding f F (Z)j S by < 4 percent, reduce THERIIAL POWER one percent or every percent by which the F (Z) factor exceeds its limit >vithin 15 minutes and within the next two hours either reduce the F (Z) factor to within its limit J

or reduce THERMAL POWER to APL or less of RATED THERIIAL POWER.

b.

With a F (Z) factor exceeding )F.(Z)jS by ) 4 percent, reduce J

J

" THERMAL POWER to API or less of RATED THERMAL POWER within 15 minutes.

The APOMS may be out of service when surveillance for determining power distribution maps is being performed.

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COOK - Unit 2 3/4 2-18 Amendment No.

POWER DISTRIBUTION LIMITS BASES Although it is interded that the plant wii1 be operated with the AXIAL FLUX DIFFERENCE within the 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 re-duced 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 devia-tion is limited.

Accordingly, a

1 hour1.157407e-5 days 2.777778e-4 hours 1.653439e-6 weeks 3.805e-7 months penalty deviation limit cumu-lative during the previous 24 hours2.777778e-4 days 0.00667 hours 3.968254e-5 weeks 9.132e-6 months is provided for operation outsidk 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 between 15K and 50/ 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 moni toring the AFD on an automatic basis are derived from.he plant process computer through the AFD Monitor Alarm.

The computer determines the one minute average of 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 outs-',de the target band and the THERMAL POWER is greater than 90% or 0.9 x APL oi RATED THERMAL POWER (whicever is less).

During operation at THERMAL f'OWER levels between 50'. and 90Ã or 0.9 x APL of RATED, THERMAL POWER (whicever is less) and between 15K and 50~

RATED THERMAL POWER, the computer outputs an alarm message when the penalty deviation accumulates beyond the limits of I hour and 2 hours2.314815e-5 days 5.555556e-4 hours 3.306878e-6 weeks 7.61e-7 months , respectively.

Figure 8 3/4 2-1 shows a typical monthly target band.

The bases and methodology for establishing these limits is presented in topical report XN-NF-77-57, "Exxon Nuclear Power Distribution Control for PWR's-Phase II" and Supplements I and 2 to that report.

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COOK - Unit 2 8 3/4 2-2 Amendment No.

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