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Proposed Changes to Tech Specs Figure I,3.2.1,4.2.1,4.2.2.1 & 4.2.2.2 Re Power Distribution Limits
	ML18086B307
Person / Time
Site:	Salem
Issue date:	02/08/1982
From:	; Public Service Enterprise Group
To:	;
Shared Package
ML18086B306	List: ML18086B305; ML18086B307;
References
	NUDOCS 8202160712
	Download: ML18086B307 (6)
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3/4.2 POWER DISTRIBUTION LIMITS 3/4.2.1 AXIAL FLUX DIFFERENCE (AFD)

LIMITING CONDITION FOR OPERATION

-+6,-ct%

3.2. 1 The indicated AXIAL FLUX DIFFERENCE shall be maintained within a~

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

APPLICABILITY:

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 ~

1.

Above 90% 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% of RATED THERMAL POWER.

2.

Between 50% and 90% of RATED THERMAL POWER:

a)

POWER OPERATION may continue provided:

1)

The indicated AFD has not been outside of the @--; -\\-~,-~ 10 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 on Figure 3.*2-1.

Otherwise, reduce THERMAL POWER to less than 50% of RATED THERMAL POWER within 30 minutes and reduce the Power Range Neutron Flux-High Trip Setpoints to less than or equal 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. 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 AFD outside of the target band during this testing without penalty deviation.

See Special Test Exception 3. 10.2 SALEM - UNIT 2 3/4 2-1

.~-- -- --- -. --- --. -\\

r 8202160712 820208 PDR ADOCK 05000311 p

PDR

POWER DISTRIBUTION LIMITS LIMITING CONDITION FOR OPERATION (Continued)

b.

c.

'i'", - s %

THERMAL POWER shall not be increased above 90I RATED THERMAL POWER unless the indicated AFD is w1thin the target band and ACTION 2.a) 1), above has been satisfied.

THERMAL POWER shall not be increased above SOS of RATED THERMAL I

POWER un 1 es s the indicated AFC has not been outside of the~

7 + b, - 5 °/0 !

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 I

the previous 24 hours2.777778e-4 days 0.00667 hours 3.968254e-5 weeks 9.132e-6 months .

Power increases above 50% of RATED THERMAL POWER do not require being within the target band provided the accumulative penalty deviation is not violated.

SURVEILLANCE REQUIREMENTS 4.2. 1. 1 The indicated AXIAL FLUX DIFFERENCE shall be determined to be within its limits during POWER OPERATION above 15% of RATED THERMAL POWER by:

a.

Monitoring the indicated AFD for each OPERABLE excore channel:

1.

At least once per 7 days when 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 the 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 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 shall be assumed to exist during the interval preceding each logging.

.~ +b.,-c_\\'fo 4.2. 1.2 The indicated AFD shall be considered outside of its~target band when at least 2 or more OPERABLE excore channels are indicQti~the AFD to be outside the target band.

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

+b, -ci ~0

a.

One minute penalty deviation 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.

One-half minute penalty deviation for each one minute of POWER OPERATION outside of the target band at THERMAL POWER levels below 50% of RATED THERMAL POWER.

SALEM - UNIT 2 3/4 2-2

POWER DISTRIBUTION LIMITS BASES

t(C,-, Ok Although it is intende~t t the plant will be operated with the AXIAL FLUX DIFFERENCE within the +/- 5% target band about the target flux difference, during rapid plant THERMAL R 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 enveloP,e of peaking factors which may be reached on a subsequent return to RATED THER~AL POWER (with the AFD within the target band) provided the time duration of the deviation is limited.

Accordingly, a l hour 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 PO~ER levels between 50% and 90% of RATED THERMAL POWER.

For THERMAL POWER levels between 15% 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 attual time reflects this reduced significance.

Provisions for monitoring the AFD are derived from the plant nuclear instrumentation system through the AFD Monitor Alarm.

A control room recorder continuously displays the auctioneered high flux difference and the target band limits as a function of power level.

A first alarm is received any time the auctioneered high flux difference exceeds the target band limits.

A second alarm is received if the AFC exceeds its allowable limits for a cumulative time of one hour during any 24 hour2.777778e-4 days 0.00667 hours 3.968254e-5 weeks 9.132e-6 months time period starting with the occurrence of the first alarm.

Time outside the target band is graphically presented on the strip chart.

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

SALEM - UNIT 2 B 3/4 2-2

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PROPOSED CHANGE HEAT FLUX HOT CHANNEL FACTOR -

FQ(Z)

TECHNICAL SPECTIFCATION SALEM UNIT NO. 2 Description of Change Modify the limit on F at fractional thermal power by changing xy the mulitplier from 0.2 to 0.3 as follows:

F L = F RTP [l + 0.3(1-PJ xy xy Reason for Change Allow optimization of core loading patterns at hot full power conditions without incurring a restrictive F limit at low xy power.

This could lead to increased fuel utilization, since fresh or depleted burnable poison rod assemblies are of ten used to flatten power at reduced power level at the expense of cycle lifetime.

Safety Evaluation Included in safety evaluation on proposed change to Axial Flux Difference Technical Specification.

/

POWER DISTRIBUTION LIMITS SURVEILLANCE REQUIREMENTS 4.2.2. l The provisions of Specification 4.0.4 are not applicable.

4.2.2.2 Fxy shall be evaluated to determine if FQ(Z) is withi_n its li111it by:

a.

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

b.

Increasing the measured Fxy component of the power distribution map by 3% to account for manufacturing tolerances and further increasing the value by 5% to account for measurement uncertainties.

c.

Comparing the Fxy computed (F;y> obtained in b, above to:

d.

1.

The Fxy limits for RATED THERMAL POWER (F:~p) for the appro-priate measured core planes given in e. and f., below, and

2.

The relationship:

F L = FRTP (1 + ~(1-P)]

xy xy where F L is the limit for fractional THERMAL POWER operation xy RTP expressed as a function of Fxy and P is the fraction of RATED THERMAL POWER at which Fxy was measured.

Remeasuring F according to the following schedule:

xy

1.

When F C is greater than the FRTP limit for the appropriate xy xy l

measured core plane but less than the Fxy relationship, addi-tional power distribution maps shall be taken and Fx; compared to FRTP and F L:

xy xy a)

Either within 24 hours2.777778e-4 days 0.00667 hours 3.968254e-5 weeks 9.132e-6 months after exceeding by 2~ of RATED THERMAL POWER or greater, the THERMAL POWER at which Fx; was last determined, or SALEM - UNIT 2 3/4 2-6

ML18086B307

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