ML18053A654

Proposed Tech Spec Pages 3-103,3-104 & 3-105 Re Linear Heat Rate

ML18053A654
Person / Time
Site:	Palisades
Issue date:	10/06/1988
From:	CONSUMERS ENERGY CO. (FORMERLY CONSUMERS POWER CO.)
To:
Shared Package
ML18053A653	List: ML18053A652 ML18053A654
References
NUDOCS 8810130124
Download: ML18053A654 (4)

Text

ATTACHMENT Consumers Power Company Palisades Plant Docket 50-255 PROPOSED TECHNICAL SPECIFICATIONS PAGE CHANGES October 6, 1988 3 Pages TSP0988-0151-NL02

3.. 23 3.23.1 POWER DIS~UTION LIMITS LINEAR HEAT RATE (LHR)

LIMITING CONDITION FOR OPERATION The LHR in the peak power fuel rod at the peak power elevation Z shall not exceed the value in Table 3~23-l times FA(Z) [the function F (Z) is shown in Figure 3.23-1].

LHR shall be monitored and maintained beiow required I

limits by using at least one of the alternative methods described in I

3.23.1.1, 3.23.1.2, or 3.23.1.3, or by reducing power below 50% of I

rated power as described in 3.23.1.4.

I APPLICABILITY:

Power operation.

3.23.1.1 Monitor LHR using the incore alarm system.

The requirements of 3.11.1 must be satisfied to utilize the incore alarm system to monitor LHR.

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ACTION:

If four or more incores exceed alarm setpoints, perform the following:

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a.

Initiate action within 15 minutes to reduce the LHR to below the LHR I

limits.

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b.

Within one hour, restore incore readings so that less than four I

incores exceed alarm setpoints.

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c. If four or more incore readings exceed alarm setpoints for one hour, I

reduce power to less than 50% of rated thermal power within the next I

two hours.

I or:

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3. 23.1. 2 Monitor LHR using the excore monitoring system.

The requirements of 3.11.2 must be satisfied to utilize the excore monitoring system to monitor LHR.

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a. Maintain axial offset (AO) within 0.05 of target axial offset.

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b. Maintain quadrant tilt less than 3%.

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c. Maintain reactor power less than or equal to the excore monitoring I

Allowable Power Level (APL) and also not more than 10% greater I

than the power level used in determining APL.

I ACTION:

/

a. If reactor power is greater than Allowable Power Level (APL) or if I

reactor power is more than 10% greater than the power level used in I

determining APL, then reduce reactor power within two hours to less I

than APL and to not more than 10% greater than the power level used I

in determining APL.

I 3-103 Amendment No.

~~.

TSP0988-0151-NL02

.3... 23 POWER DISTRI~ON LIMITS 3.23.1 LINEAR HEAT RATE (LHR)

(Continued)

LIMITING CONDITION FOR OPERATION

b. If measured axial offset (AO) deviates from target axial offset by I

or:

more than 0.05 or if quadrant tilt exceeds 3%, discontinue using the I

excore monitoring system for monitoring LHR.

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3.23.1.3 Monitor LHR by taking manual incore readings.

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a.

Reduce reactor power to less than 85% of rated thermal power I

within two hours.

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b.

Within the next two hours and every two hours thereafter, I

manually record incore readings.

Readings shall be taken on a I

minimum of ten individual detectors per quadrant (to include I

50% of the total number of detectors in a 10 hour1.157407e-4 days <br />0.00278 hours <br />1.653439e-5 weeks <br />3.805e-6 months <br /> period).

I ACTION:

/

With a manual incore reading equal to or greater than the alarm setpoint;

/

perform the following:

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a. Initiate action within 15 minutes to reduce the LHR to below the LHR limits.

b.

Restore the incore reading to less than the alarm setpoint within

• one hour.

c.

If the incore reading is not restored below the alarm setpoint within one hour, reduce reactor power to less than 50% of rated power within the next two hours.

or:

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I 3.23.1.4 When LHR cannot be monitored as specified in 3.23.1.1, or I

3.23.1.2, or 3.23.1.3 above, maintain LHR within limits by I

maintaining reactor power less than 50% of rated thermal power.

I ACTION:

/

Reduce reactor power to less than 85% of rated thermal power within two I

hours and to less than 50% of rated thermal power within the next I

two hours.

Power increases are allowed up *to a maximum of 50% of rated I

thermal power.

I 3-104 Amendment No.

~S. SZ, TSP0988-0151-NL02

e 3.23 POWER DISTRIBUTION LIMITS 3.23.1 LINEAR HEAT RATE (LHR)

LIMITING CONDITION FOR OPERATION Basis The limitation of LHR ensures that, in the event of a LOCA, the peak temperature of the cladding will not exceed 2200°F. (l).

Either of the two core power distribution monitoring systems (the incore alarm system or the excore monitoring system) provides adequate monitoring of the core power distribution and is capable of verifying that the LHR does not exceed its limits.

The incore alarm system performs this function by continuously monitoring the local power at many points throughout the core and comparing the measurements to predetermined setpoints above which the limit on LHR could be exceeded.

The excore monitoring system performs this function by providing comparison of t_he measured core AO with predetermined AO limits based on incore measurements.

An excore monitoring Allowable Power Level (APL), which may be less than rated power, is applied when using the excore monitoring system to ensure that the AO limits adequately restrict the LHR to less than the limiting values. <4)

If the incore alarm system and the excore monitoring system are both inoperable, power will be reduced to provide margin between the actual peak LHR and the LHR limits and the incore readings will be manually collected at the terminal blocks in the control room utilizing a suitable signal detector.

If this is not feasible with the manpower available, the reactor power will be reduced to a point below which it is improbable that the LHR limits could be exceeded.

The time interval of 2 hours2.314815e-5 days <br />5.555556e-4 hours <br />3.306878e-6 weeks <br />7.61e-7 months <br /> and the minimum of 10 detectors per quadrant are sufficient to maintain adequate surveillance of the core power distribution to detect significant changes until the monitoring systems are returned to service.

To ensure that the design margin of safety is maintained, the determination of both the incore alarm setpoints and the APL takes into account a measurement uncertainty factor of 1.10, an engineering uncertainty factor of 1.03, a thermal power measurement uncertainty factor of 1.02 and allowance for quadrant tilt.

References (1)

(2,3)

(4)

ANF-88-107 Deleted XN-NF-80-47 TSP0988-0151-NL02 3-105 Amendment No fSS, I

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