ML20235U783

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Proposed Tech Specs Supporting Cycle 3 Reload
ML20235U783
Person / Time
Site: Grand Gulf Entergy icon.png
Issue date: 10/09/1987
From:
SYSTEM ENERGY RESOURCES, INC.
To:
Shared Package
ML20235U774 List:
References
NUDOCS 8710140253
Download: ML20235U783 (9)
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Text

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i Qigures'3.2'l-1 2.1-1 3/4.2 POWER DISTRIBUTION LIMITS b i 3/4.2.1~ AVERAGE PLANAR LINEAR HEAT GENERATION RATE 4

}JMITINGCONDITIONFOROPERATION 3.2.1 During two loop operation all AVERAGE PLANAR LINEAR HEAT GENERATION RATES (APLHGRs) for each type of fueljsa_functionofAVERAGEPLANAREXPOSURE shall not exceed the limits shown inw....J.2T Dias multiplied by tne smaller l of either the flow dependent MAPLHGR factor (MAPFAC ) of Figure 3.2.1-2, or the f

power-dependent MAPLHGR factor (MAPFAC p

) of Figure 3.2.1-3.

During single loop operation, the APLHGR for each type of fuel as a function of AVERAGE PLANAR EXPOSURE shall not exceed the limits as determined below:

a) for fuel typqc)8CR210 .:- fM- the limit shown in Figure 3.2.1-1 l as multiplied by the smaller of either MAPFAC MAPFAC or 0.86; f p b) forAfuelE7pih the limit determined in "A" above for fuel type l 8CR210.

APPLICABILITY: OPERATIONAL CONDITION 1, when THERMAL POWER is greater than or equal to 25% of RATED THERMAL POWER.

~

ACTION:

N res [ 23 -h 3.).~1-la, 3.2.111bi or13. @

During two lootoperation crisingle loop operation, with an APLHGR exceeding i the' limits ofD i,.i. J.".; % .as corrected by the appropriate multiplication l, l factor for eac) Type of Tuel, initiate corrective action within 15 minutes and restore APLHGR to within the required limits within 2 hours2.314815e-5 days <br />5.555556e-4 hours <br />3.306878e-6 weeks <br />7.61e-7 months <br /> or reduce THERMAL POWER to less than 25% of RATED THERMAL POWER within the next 4 hours4.62963e-5 days <br />0.00111 hours <br />6.613757e-6 weeks <br />1.522e-6 months <br />.

SURVEILLANCE REQUIREMENTS .

4.2.1 All APLHGRs shall be verified to be equal to or less than the required limits: .

a. At least once per 24 hours2.777778e-4 days <br />0.00667 hours <br />3.968254e-5 weeks <br />9.132e-6 months <br />,
b. Within 12 hours1.388889e-4 days <br />0.00333 hours <br />1.984127e-5 weeks <br />4.566e-6 months <br /> after comp 13 tion of a THERMAL POWER increase of at least 15% of RATED THERMAL POWER, and
c. Initially and at least once per 12 hours1.388889e-4 days <br />0.00333 hours <br />1.984127e-5 weeks <br />4.566e-6 months <br /> when the reactor is operating with a LIMITING CONTROL ROD PATTERN for APLHGR.
d. The provisions of Specification 4.0.4 are not applicable.

8710140253 871009 PDR P

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FOR P> 70%;-

0.8 , . . .

.- foR 25 %C Psdo%;. . EURilG CNE LDOP OPERAT!oN CORE FLDW F $,So%

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CORE THERMAL POWER (% RATED)P i

i FIGURE 3.2.1-3 MAPFAC p

GRAND GULF-UNIT 1 3/4 2 h h Amendment No. _ l 1

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FOR MAX FLOW sl02.5%(GE)m o

FOR MAX RD#sl07D* (GE) -

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GRAND GULF-UNIT 1 3/4 2 Q @ Amendment No. _

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& Q' [l3 Figures 3.2.1-1, 3.2.1-la. 3.2.1-lb, . or 3.2.1-Ic 3/4.2 POWER DISTRIBUTION LIMITS

' BASE 5-

' .~

. - The specifications of this section' assure that the peak cladding temper-ature following the postulated design basis loss-of-coolant ateident will not exceed the 2200*F limit specified in 10 CFR 50.46.-

3/4.2.1 - AVERAGE PLANAR LINEAR HEAT GENERATION RATE -

This specification. assures that the peak cladding temperature following the postulated design basis loss-of-coolant accident will not exceed the limit specified in 10 CFR 50.46.

1 The peak cladding temperature (PCT) following a postulated loss-of-coolant g' . . accident is primarily a function of the average heat generation rate of all the rods of a fuel assembly at any axial. location and is dependent only secondar-11y on the rod to rod power distribution within an assembly. The peak clad tem- ~

perature-is calculated assuming a LHGR for the highest powered rod which is equal-to or less than the design LHGR corrected for densification. This LHGR times 1.02 is used in the heatup code along with the exposure dependent steady

^ state gap conductance and rod-to-rod local peaking factor. The Technical spect-fication AVERAGE PLANAR LINEAR HEAT GENERATION RATE (APLHGR) is this LHGR of-

the highest powered rod divided by its local peaking factor. The Maximum Aver-

. age Planar Linear Heat Generation Rate (MAPLHGR) limits ofG,... J.t.; Fare ll sultiplied by the smaller of either:the flow dependent MAPLHGR factor.(MAPFACf )

or the power dependent MAPLHGR factor (MAPFAC p

) corresponding to existing core flow and power state to assure the' adherence to fuel mechanical design bases during the most limiting transient. The maximum factor (MAPFAC) for single-loop operation is 0.86.- g For single-loop operation with@8x8 fuel, a MAPLHGR Ifmit corresponding l1

- to the product of the highest enriched GE fuel MAPLHGR, and tne appropriate MAPFAC, can be conservatively used, provided that the average planar exposure  ;

is limited Q /ST. , ,

I MAPFAC 's 'are determined using the three-dimensional BWR simulator code to f

analyze slow flow runout transients. Two curves for each fuel vender are pro-

. vided for use based on the existing setting of the core flow limiter in the l Recirculation Flow Control System. The curve representative of a saximum core i flow limit of 107.0% is more restrictive due to the larger potential flow runout i' ~ transient.,

MAPFAC p 's are generated using the same data base as the MCPR, to protect i

the core from plant transients other than core flow increases.

l l The daily requirement for calculating APLHGR when THERMAL POWER is greater l than or equal to 25% of RATED THERMAL POWER is sufficient since power distribu-tion shifts are very slow when there have not been significant power or control 1 i

.i GRAND GULF-UNIT 1 B 3/4 2-1 Amendment No. l e

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