ML20198Q557

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Rev 0 to, Sequoyah Nuclear Plant,Unit 2,Cycle 9,COLR
ML20198Q557
Person / Time
Site: Sequoyah Tennessee Valley Authority icon.png
Issue date: 10/23/1997
From: Lamons J
TENNESSEE VALLEY AUTHORITY
To:
Shared Package
ML20198Q549 List:
References
NUDOCS 9711120248
Download: ML20198Q557 (12)
v • d • e


Text

8 O e, 4 . ,

9 ENCLOSURE l

SEQUOYAH NUCLEAR PLANT UNIT 2 CYCLE 9 CORE OPERATING LIMITS REPORT REVISION O (L36 971002 803) 4 97111P0248 971103 PDR P

ADOCK 03000328 pg .

.c L36 971002 803 SEQUOYAH NUCLEAR PLANT UNIT 2, CYCLE 9 l CORE OPERATING LIMITS REPORT j 3

REVISION O l October 1997 Prepared:

4 .. /- /O-5-97 Date

-Nuclear Fuel G ,

! Reviewed bw!N -

= Reactor Enffheering Supervisor

/ /O-9-97 Date

/ /O *lO *9 7 opera tfodsVManager Dat e

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j A ts.htm / } O *23 *$)

Date PORC Chairman %I 9  !

Revision' 0 Pages affected Reason for-Revision 1

SEQUOYAH'- UNIT 2 -Page 1 of 12 Revision 0 1.

  • . j COLR FOR SEQUOYAH UNIT 2 CYCLE 9 4

1.0 CORE OPERATING LIMITS REPORT This Core Operating Limits Report (COLR) for Sequoyah Unit 2 Cycle 9 has been prepared in accordance with the requirements of Technical Specification (TS) 6.9.1.14.

The TSs affected by this report are listed below:

TABLE 2.2.1 f t(AI) trip reset function for OTAT Trip (QTNL, QTPL' and rates of trip setpoint decrease per percent AI (QTNS, QTPS)

TABLE 2.2.1 f2(AI) trip reset function for OPAT Trip (QPNL, QPPL) and rates of trip setpoint decrease per percent AI (QPNS, QPPS) .

3/4.1.1.3 Moderator Temperature coefficient (MTC) 3/4.1.3.5 Chutdown Rod Insercion Limit 3/4.1.3.6 Control Rod Insertion Limits 3/4.2.1 Axial Flux Difference (AFD) 3/4.2.2 Heat Flux Hot C'iannel Factor (Fg(X,Y,Z))

3/4.2.3 Nuclear Enthalpy Rise Hot Channel Factor (FAH(X,Y))

2.0 OPERATING LIMITS The cycle-specific parameter limits for the specifications listed in section 1.0 are presented in the following subsections. These limits have been developed using the NRC approved methodologies specified in TS 6.9.1.14.

The following abbreviations are used in this section:

BOL stands for Bseginning of Cycle Life ARO stands for A13. Rods Out HZP stands for Hot Zero THERMAL POWER EOL stands for End of Cycle Life RTP stands for RATED THERMAL POWER 2.1 Moderator Temperature coefficient - MTC (Specification 3/4.1.1.3) 2.1.1 The MTC limits are:

The BOL/ARO/HZP-MTC shall be less positive than 0 Ak/k/*F (BOL limit). With the measured BOL/ARO/HZP-MTC more positive than 0 Ak/k/*F (as-2easured MTC limit), establish control rod withdrawal limits to ensure the MTC remains less positive than 0 Ak/k/*F for all times in core life.

SEQUOYAH - UNIT 2 Page 2 of 12 Revision 0 l

l i

COLR FOR SEQUOYAH UNIT 2 CYCLE 9 The EOL/ARO/RTP-MTC shall be less negative than or equal to -4.5 x j

~4 10 Ak/ k/9F.  ;

2.1.2 The 300 ppm surveillance limit is:

The measured 300 ppm /ARO/RTP-MTC should be less negative than or

~4 equal to -3.75 x 10 Ak/k/*F. l 2.2- Shutdown Rod Insertion Limit (Specification 3/4.1.3.5) j 2.2.1 The shutdown rods shall be withdrawn to a position as defined [

below Cycle Burnup (MWD /MTU) Steps Withdrawn i 5 4,000 3 225 to 5 231

> 4,000 to < 14,000 2 222 to 5 231 3 14,000 1 225 *.o S 231 2.3 control Rod Insertion Limits (Specifie.ation 3/4.1.3.6) 2.3.1 The control rod banks shall be limited in physical insertion as shown in Figure 1.

2.4 Axial Flux Difference - AFD (Specification 3/4.2.1) 2.4.1 The axial flux difference (AFD) limi ts (AFDLimitiare provided in Figure 2.

2.5 Heat Flux Hot Channel Factor - Fg(X,Y, Z) (Specification 3/4.2.2)

Fg (X, Y, Z ) shall be limited ly the following relationships:

4 y RTP Fg (X, Y, Z ) s

  • K(Z) for P > 0.5 P

pqRTP Fg(X,Y,Z) s

  • K(Z) for P s 0.5 0.5 THERMAL POWER where P= -

RATED THERMAL Pt'4ER SEQUOYAH - UNIT 2 Page 3 of 12 Revision O I

l CoLR FOR SEQUOYAH UNIT 2 CYCLE 9 i

2.5.1 FgRTP = 2.50 fer Mark-BW fuel FgRTP = 2.40 f or Westinghouse fuel 2.5.2 K(Z) is provided in Figure 3 for Mark-BW fuel. l l

K(Z) is provided in Figure 4 for Westinghouse fuel. j The following parameters are required for core moriitoring per the Surveillance Requirements of Specification 3/4.2.2:

2. 5. 3 NSLOPEAFD = 1.36 where NSLOPEAFD = Negative AFD limit adjustment required to compensate for each 1% that F9(X,Y,Z) execeds BQDES.
2. 5. 4 PS LOPEAFD = 1.32 where PSLOPEAID = Poritive AFD limit adjustment required to compensate for each 1% that Fg(X,Y,Z) exceeds BQDES.
2. 5. 5 NSLOPE f 2 IdII = 2.38 where NSLOPE 2f IOI) = Adjustment to negative OPAT 2 f (AT) limit required to compensate for each 1% that Fg (X , Y, Z ) exceuds BCDES.
2. 5. 6 PSLOPE 2f IAII = 2,51 where PSLOPE f 2( AI) = Adjustment to positive OPAT f2(AI) limit required to compensate for each 1% that Fg(X,Y,Z) exceeds BCDES.
2. 5. 7 BQNOM(X, Y, Z) = Nominal design p$aking f actor, increased by an allowance for the expected deviation between the nominal design power distribution and the measurement.

2.5.0 BQDES(X,Y,Z) = Maximum allowable design peaking factor which ensures that the Fg(X,Y,Z) limit will be preserved for operation within the LCO limits, including allowances for calculational and measurement uncertainties.

2. 5. 9 BCDES (X, Y, Z ) = Maximum allowable design peaking factor which ensures that the centerline fuel melt limit will be preserved for operation within the LCO limits, including allowances for calculational and meacurement uncertainties.

SEQUOYAH - UNIT 2 Page 4 of 12 Revision 0

1 COLR FOR SEQUOYAH UNIT 2 CYCLE 9 BQNOM(X,Y,Z), BQDES (X, Y, Z) , and SCDES(X,Y,Z) data bases are provided for input to the plant power distribution analysis codes on a cycle specific basis and are determined using the methodology for core limit generation aescribed in the references in  ;

Specification 6.9.1.14.  ;

2.5.10 All cycle burnups shall use a 2% increase in FgM(X,Y, Z) margin for compliance with the 4.2.2.2.e Surveillance Requirements.

2.6 Nuclear Enthalpy Rise Hot channel Factor - FAH(X,Y)

(Lpecification 3/4.2.3)

FAH(X,Y) shall be limited by the following relationships FAH(X,Y) 3 MAP (X,Y,Z) / AXIAL (X,Y) 2.6.1 MAP (X,Y,Z) is provided in Table 1 for Mark-BW fuel and Westinghouse fuel.

AXIAL (X,Y) is the axial peak from the normalized axial power shape.

The following parameters are required for core monitoring per the surveillance Requirements of Specification 3/4.2.3:

FAHRM (X, Y) < BHNOM (X, Y) where FAHR M(X,Y) = Fag (X,Y) / MAPM / AXIAL (X,Y)

FAH(X,Y) is the measured radial peak at location X,Y.

MAPM is the value of MAP (X,Y,Z) obtained from Table 1 for the measured peak.

2.6.2 BHNOM(X,Y) e nominal design radial peaking f actor, increased by I an allowance for the expected deviation betwcen the nominal design power distribution and the measurement.

2.6.3 BHDES(X,Y) = maximum allowable design radial peaking f actor which ensures that the FAH(X.Y) limit will be preserved tor operation within the LCO limits, including allowances for calculational and measurement uncertainties.

2.6.4 BRDES(X,Y) = maximum alloweble design radial peaking f actor which ensures that the steady state DNBR limit will be preserved for operation within the LCO limits, including allowances for calculational and measurement uncertainties.

SEQUOYAH - UNIT 2 Page 5 of 12 Revision 0 u

COLR FOR SEQUOYAH UNIT 2 CYCLE 9 BHNOM(X,Y), BHDES(X,Y) and BRDES(X,Y) data bases are provided for '

input to the p) ant power distribution analysis computer codes on a cycle specific basis and are determined using the methodology for t core limit generation described in the references in specification 6.9.1.14.

2.6.5 RRH = 3.14 when 0. 8 < P $ 1. 0 [

RRH = 1.67 when P $ 0. 8 where RRH = Thermal power reduction required to compensate for each 1% that FAH(X,Y) exceeds its limit. .

P = Thermal Power / Rated Thernal Power 2.6.6 TRH = 0.034 when 0. 8 < P $ 1. 0 TRH = 0. 017 when P $ 0. 8 where TRH = Reduction in OTAT X1 setpoint required to compensate for each 1% that FAH(X,Y) exceeds its limit.

2.6.7 All cycle burnups shall use a 2% increase in FAH "(X, Y) margin for compliance with the 4.2.3.2.d.1 Surveillance Requirement. ,

3.0 REACTOR CORE PROTECTIVE LIMITS 3.1 Trip Reset Term [ fi( AI) ) for overtumperature Delta T-Trip (Specification 2.2.1)

The following parameters are required to specify the power level-dependent f (AI) trip reset term limits for the Overtemperature Delta-T i

trip function:

3.1.1 QTHL = -24%

where QTNL = the maximum negative AI setpoint at rated thermal .

power at which the trip setpoint is not redaced by the axial power distribation.

3.1.2 QTPL = +5%

where QTPL = the maximum positive AI setpoint at rated thertal power at which the trip setpoint is not reduced by the axial power dit.tribution.

3.1.3 QTNS = 2.30%

where QTNS = the percent reduction in Overtemperature Delta-T trip

. setpoint for each percent that the magnitude of AI exceeds its negative limit at rated thermal power (QTNL) .

SEQUOYAH - UNIT 2 Page 6 of 12 Revision 0

COLR FOR SEQUOYAH UNIT 2 CYCLE 9 1

3.1.4 QTPS = 1.10%

where QTPS = the percent reduction in Overtemperature Delta-T trip setpoin'; for each percent that the magnitude of AI exceeds its positive limit at rated therm &1 power (OTPL).

3.2 Trip Reset Term i fr(AI) ) f or overpower Delta-T Trip (Specification 2.2.1)

The following parameters are required to specify the power level-dependent f ( AI) trip reset term limits for the overpower Delta-T trip function:

3.2.1 QPNL = -35%

where QPNL = the maximum negative AI setpoint at rated thermal power at which the trip setpoint is not reduced by the axial power distribution.

3.2.2 QPPL s +30%

where QPPL = the maximum positive AI setpoint at rated thermal power at which the trip setpoint is not reduced by the ax4a1 power distribution.

3.2.3 QPNS = 1.50%

where QPNs = the percent reduction in overpower Delta-T trip setpoint for each percent that the magnitude of AI exceeds its negative limit at rated thermal power (QPNL) .

3.2.4 QPPS = 1.50%

where QPPS = the percent reduction in Overoower Delta T trip setpoint for each percen* .c - the magnitude of AI exceeds its positive limit at rated thermal power (QPPL).

t .

SEQUOYAH - UNIT 2 Page 7 of 12 Revision 0

+

COLR FOR-SEQUOYAH UNIT 2. CYCLE 9 Table 1-Maxianasa Allowable Peaking Limits MAP (X,Y,5)

Mk-BW Fuel W Fuel Elevation (ft) AXIAL (X,Y). MAP (X.Y.Z) MAP (X Y 7) 2 1.1 -1.970 1.899

-4 1.966. -1.897-

~6 1.958 1.893 8 1.945 1.881 10 1.917 1.851 2 1.2 2.208 ~2.135 4 2.197 2.131 6 2.180 2.119

-8 2.150 2.092 10 2.072 1.991 2 1.3 2.453 2.373 4 '?.434 2.372 6 2.406 2.339 8 2.315 2.219 10 2.185 2.100 [

2 1.4 2.702- 2.626 '

4 2.672 2.570 6 2.572 2.446 8' ~

2.429 2.320 10 2.288 2.191 ,

2 1.5 2.956 2.777 ,

-4 2.826 2.664  ;

6 2.683 2.538 l 8' 2.529 2.405 -

10 2.381 2.269 .

l 2 1.7 3.1G2 2.911 4 .3.007 2.804  ;

6 2.650 2.685 8 2.690 2.542 10 2.542 -2.413 -)

l 2 1.9- '3.283 3.004 24 3.133. 2.916 6 2.982' 2.805 8 2.821' 2.659 10 2.685 2.532 SEQUOYAH - UNIT 2 'Page 8 of 12- Revision 0

~

COLR For Sequoyah Unit 2 Cycle 9

(.605.231)

(Fully Withdrawn.Regionf , ( ,

220 -

(.58,22ir 200 -- -

(1.0.182 180 -- -

c160 -- - ' - - - - -

.2 .

= . .

8140 n.

BANK C:

2120 -- -

us .

x (0,110) g100 --

m  :  :  :

E 80 -- -

2  : BANK D '

60 -- ' - -

40 --

20 -- - --

.09,0) j j j j 0 0.2 0.4 0.6 0.8 1 (Fully 3 Inserted) Fraction of Rated Thermal Power FIGURE 1 Rod Bank Insertion Limits Versus Thermal Power Four Loop Operation Fully withdrawn region shall be the condition where shutdown and control banks are at a position within the Interval of 1222 and 1231 steps withdrawn, inclusive.

Fully withdrawn shall be the position as defined below, Cvele Burnuo (mwd /MTU) Sten Withdrawn 14000 1225 to 1231 l > 4000 to < 14,000 1222 to 1231 1 14,000 1225 to 1231 SEQUOYAH - UNIT 2 Page 9 of 12 Revision 0 1

1.. .

i COLR For Sequoyah Unit 2 Cycle 9 i

120 , , , , , , ,

. t 110 -- -

(-13,100) (7,10.0) 100 90 unac'ceptable  :

unace'eptable ,

g Op$ ration  :

' Ope, ration R 80 --

Acceptable . -

Operation .'

n 70 -.

E m

e . . . .

iS 60 --

y . . . . . .

y . . . . .

~

50 (36,50) ;

$ (*48,50) ,

o 40 --

- ~ - - -

30 --

20 --

10 --

i i i i i i  !

9  ;

40 20 -10 0 10 20 30 40 50 1 Flux Difference (delta 1) w l FIGURE 2 Axial Flux Difference Limits As j A Function Of Rated Thermal Power )

SEQUOYAH - UNIT 2 Page 10 of 12 Revision 0

COLR For Sequoyah Unit 2 Cycle 9 1.2 . .

3 2.5 1

0.8 --

2 0 u

g g

: g ti 0 .6 -- -

1.5 m M . . . e a

.  : .5 0.4

^ ' ~

-' ~

1 Core' Rela t' 'klZb PO O.000 ft ' l.000 2.600 :

6.286 ft I 1.000 . 2.500 0.2 -- .

7.996 ft : 0.966-:-2.415 -

0.5 0.705 ft 0.920 2 300 3

12.000 ft - 0.858 2.145 0 O O 2 4 6 8 10 12 Core Height (Feet)

FIGURE 3 K(Z) - Normalized FQ(X,Y,Z) as a Function of Core Height (Mark BW Fuel)

SEQUOYAH - UNIT 2 Page 11 of 12 Revision 0

COLR For Sequoyah Unit 2 Cycle 9 1.2 . . , .

2.5 1

M -

. . . N 2

0.8 -' ' '- * **

O

:  : .  : 1 f

g

^ - - -

1.5 *E CL x O .6 --

a e

: .  : Q.

~

5 0.4 -- - '

Core Helaht Kf2)

FO '.'*

~

0

0.000!ft 1.000 2.400 .

6.000:ft 1.000 2.400  :

0.2 -'

0.5

' ['10.800hft '0.940 ' '2~ 256 ,

12.000: ft 0.9 2 5 2 .2'2 0 .

8:

t 0 O .

0 2 4 6 8 10 12 Core Height (Feet)

FIGURE 4 K(Z) - Normalized FQ(X,Y,Z) as a Function of Core Height (Westinghouse Fuel)

SEQUOYAH - UNIT 2 Page 12 of 12 Revision 0

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