ML17216A314

Proposed Tech Specs,Changing Linear Heat Rate Limiting Condition for Operation from Constant Value to Represent Axially Dependent Limit for All Fuel in Core

ML17216A314
Person / Time
Site:	Saint Lucie
Issue date:	10/17/1985
From:	FLORIDA POWER & LIGHT CO.
To:
Shared Package
ML17216A313	List: ML17216A312 ML17216A314
References
NUDOCS 8510230022
Download: ML17216A314 (9)

Text

3/4.2 POMER DISTRIBUTION LIMITS LINEAR HEAT RATE LIHITING CONDITION FOR OPERATION 3.2.1 The linear heat rate shall not exceed the 1imits shown on Figure

3. 2-1.

APPLICABILITY: NODE 1 8 ACTION:

Hith the linear heat rate exceeding its limits, as indicated by four or more coincident incore channels or by the AXIAL SHAPE INDEX outside of the power dependent control limits of Figure 3.2-2. within 15 minutes initiate corrective action to reduce the linear heat i ate to within the limits and either:

a. Restore the linear heat rate to within its limits within one

=

hour, or

b. Be in HOT STANDBY within 'the next 6 hours6.944444e-5 days <br />0.00167 hours <br />9.920635e-6 weeks <br />2.283e-6 months <br />.

SURVEILLANCE RE UIREMENTS 4.2.1.1 The provisions of Specification 4.0.4 are not applicable.

4.2.1.2 The linear heat rate shall be determined to be within its limits by continuously monitoring the core power distribution with

~

either the excore detector monitoring system or with the incore detector monitoring system.

4.2.1.3 Excore Detector Monitorin S stem - The excore detector moni-toring system may be used for monitoring the core power distribution by:

a. Verifying at least once per 12 hours1.388889e-4 days <br />0.00333 hours <br />1.984127e-5 weeks <br />4.566e-6 months <br /> that the full length CEAs are withdrawn to and maintained at or beyond the Long Term Steady State Insertion Limit of Specification 3.1.3.6.

b. Verifying at least once per 31 days that the AXIAL SHAPE INDEX alarm setpoints are adjusted to within the limits shown on Figure 3.2-2.

85i0230022 85l0g8

>>R, RDOCZ OROOOSSR PDR

+Ecccp/ c/ccrt7/>cr+m~ce c/ XpccrP ccrc ~~ +,/, /, c/, g ST. LUCIE - UNIT 1 3/4 2-1 Amendment No,

t POWER OI STR I BUT I ON LIMITS SURVEILLANCE RE UIREMENTS Continued c~ Verifying that the AXIAL SHAPE INDEX is maintained within the allowable limits of Figure 3.2-2, where 100 percent of maximum allowable power represents the maximum THERMAL POWER allowed by the following expr ession:

MxN where:

l. M is the maximum allowable -THERMAL POMER levei for the existing Reactor Coolant Pump combination.

2. N is the maximum allowable fraction of RATED THEiML POWER as determined by the F curve of Figure 3.2-3.

4.2.1.4 Incore Detector'onitorin S stem - The incore detector monitor-ing system may be used for monitoring the core power distribution by verifying that the incore detector Local Power Density alarms;

a. 'redistribution adjusted to satisfy the requirements of the map which shall be updated at least core power once per 31 days of accumulated operation in MODE 1.

b. Have their alarm setpoint adjusted to less than or equal to the limits shown on Figure 3.2-1 when the following factors are appropriately included in the setting of these alarms:

1. A measurement-calculational uncertainty factor of 1.07,

2. An engineering uncertainty factor of 1.03, A THERMAL P{NER measurement uncertainty factor of 1 .02 .

PIf the core system becomes inoperable, reduce power to M x N within 4 hours4.62963e-5 days <br />0.00111 hours <br />6.613757e-6 weeks <br />1.522e-6 months <br /> and monitor linear heat rate in accordance with Specification 4.2.1.

ST. LUCIE - .UNIT 1 3/4 2-2 Amendment No. 77, 27, HZiSBka

UNACCEPTABLE OPERATION

,(0.6, 15.0) 5og 15 (0.81, 13.4) xaO M CI ACCEPTABLE OPERATION P1 + (1.0g 10.07) 0 0

0.0 .0. 5 1.0 FRACTION OF CORE HEIGHT FIGURE 3.2-1 ALLOWABLE PEAK LINEAR HEAT RATE VERSUS FRACTION OF CORE HEIGHT ST. LUCIE UNIT 1 3/4 2-3 Amendment No.

1.2 1.1 1.0 REGION OF UNACCEPTABLE OPERATION 0.9 (0. 0, 0. 82) (0.15, 0.82) 0.8 REGION OF Pg UNACCEPTABLE OPERATXON 0.7 0

0.6 REGION OF 0

ACCEPTABLE (0.3, 0.58) u OPERATION 0.5 4

(-0.3,0.45)

-0.6 -0.4 -0.2 0.0 0.2 0.4 -0.6 PERIPHERAL AXIAL SHAPE INDEX FXGURE 3.2-2 AXIAL SHAPE XNDEX vs. MAXIMUM ALLOWABLE POWER LEVEL PER SPECIFICATION 4.2.1.3 ST. LUCIE UNIT 1 3/4 2-.4 Amendment No.

4 ~

~

~

~ ~

3/4,2 POWER DISTRIBUTION LIMITS BASES 3 4.2.1 LINEAR'EAT RATE The limitation on linear heat rate ensures'hat in the event of a LOCA, the peak temperature of the fuel cladding will not exceed 2200'F.

Either of the two core power distribution monitoring systems, the Excore Detector Monitoring System and the Incore Detector Monitoring System, provides adequate monitoring of the core power distribution and is capable of verifying that the linear heat rate does not exceed its limits . The Excore Detector Monitoring System performs this function by continuously monitoring the AXIAL SHAPE INDEX with the OPERABLE quadrant symmetric excore neutron f1ux detectors and verifying that the AXIAL SHAPE INDEX is maintained within the allowable limits of Figure 3.2-2. In con)unction with the use of the excore monitoring system and in establishing the AXIAL SHAPE INDEX limits, the following assump-tio'ns are made: 1) the CEA insertion limits of Specifications 3.1.3.5 and 3.1.3 .6 are satisfied; 2) the AZIMUTHAL POWER TILT restrictions of Specifica-tion 3.2.4 are satisfied, and 3) the TOTAL PLANAR RADIAL PEAKING FACTOR does not exceed the limits of Specification 3.2.2.

The Incore Detector Monitoring System continuously provides a direct measure of the peaking factors and the alarms which have been established for the individual incore detector segments ensure that the peak linear heat rates will be maintained within the allowable limits of Figure 3.2-.1. The setpoints for these alarms include allowances, set in the conservative directions, for

1) a measurement-calculational uncertainty factor of 1.07, 2) an engineering uncer tainty factor of 1.03,%3) a THERMAL POWER measurement uncertainty factor of 1.02.

3 4.2.2 3/4.2.3 and 3 4.2.4 TOTAL PLANAR AND INTEGRATED RADIAL PEAKING FACTORS - Fx AND FAND AZIMUTHAL POWER TILT - T The limitations on F xy and T are provided to ensure that the assump-q tions used in the analysis for establishing the Linear Heat. Rate and Local Power Density-High LCOs and LSSS setpoints remain valid during operation at the various allowable CEA group insertion limits. The limitations on F and T are provided to ensure that the assumptions r

ST. LUCIE - UNIT 1 B 3/4 2-1 Amendment No. g7, NZ, AV 65

)i' STATE OF FLORIDA COUNTY OF DADE J. W. Williams Jr. being first duly sworn, deposes and says:

That he is a Grou Vice President of Florida Power & Light Company, the Licensee herein; That he has executed the foregoing document; that the statements made in this document are true and correct to the best of his knowledge, information, and belief, and that he is authorized to execute the document on behalf of said Licensee.

J. W. Williams, Jr.

Subscribed and worn to before me this

/7 day of NGTAR 1'PUBLIC, in and for the County of Dade, State of Florida NOTARy PUBLIC STAtE OF FLORIDA Ny CONNISSION EXP SEPT 18 1989 BONOEO TURB GENERAl INS, UNP My Commission expires:

a

'i " l

/

l