ML20235U783

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


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 ) of Figure 3.2.1-3.

p 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.

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

ACTION:

~

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.

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i FIGURE 3.2.1-3 MAPFACp 3/4 2 h h Amendment No. _

l GRAND GULF-UNIT 1 1

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FOR MAX FLOW sl02.5%(GE)m FOR MAX RD#sl07D* (GE)

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Amendment No. _

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[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.(MAPFAC )

f or the power dependent MAPLHGR factor (MAPFAC ) corresponding to existing core p

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 l 1

- 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 flow limit of 107.0% is more restrictive due to the larger potential flow runout ii'

~ transient.,

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

the core from plant transients other than core flow increases.

i l

l The daily requirement for calculating APLHGR when THERMAL POWER is greater l

1 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 i

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

l e

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