ML20148A634

From kanterella
Jump to navigation Jump to search
Rev 0 to Sequoyah Nuclear Plant Unit 1 Cycle 9,COLR
ML20148A634
Person / Time
Site: Sequoyah Tennessee Valley Authority icon.png
Issue date: 04/01/1997
From:
TENNESSEE VALLEY AUTHORITY
To:
Shared Package
ML20148A631 List:
References
NUDOCS 9705090105
Download: ML20148A634 (13)
v • d • e


Text

4 e eukx a=* -

h4 at!- -h-0 ENCLOSURE SEQUOYAH NUCLEAR PLANT UNIT 1 CYCLE 9 CORE OPERATING LIMITS REPORT REVISION O l

~

9705090105 970502 PDR ADOCK 05000327 P PDR ,,;

. _ . _ . _ . . . .. . . . - . . . .. . -. __ _ m_.. _ _ _ _ . _ - . . _ _ _ , _ .

L36 970331 -800 DA [p.,:o.yw. . .-.

SEQUOYAH NUCLEAR PLANT UNIT 1, CYCLE 9 "'

CORE OPERATING LIMITS REPORT REVISION O March 1997 j Prepared:

/ 3-3I-97 Nuclear Fuel Date Reviewed: j

$0L Reactor Erfgfnee ring Supervisor

/ % / - Y)

Date O

ks .e m# /

/9i Ope dtr ris ahagerl / / pate t

  • (

PORC Chairinan n/

i h

J 01 I'![1 / H/l/0) i

'l

/ Bate l

1 i

Revision 0 Pages affected Reason for Revision l

I

( i l

SEQUOYAH - UNIT 1 Page 1 of 12 Revision 0 j l

1

i

. 1 l

COLR FOR SEQUOYAH UNIT 1 CYCLE 9 1.0 CORE OPERATING LIMITS REPORT This Core Operating Limits Report (COLR) for Sequoyah Unit 1 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 f1(AI) trip reset function for OTAT Trip (QTNL, QTPL) and rates of trip setpoint decrease per percent AI (QTNS,  ;

QTPS) l l

TABLE 2.2.1 f2(AI) trip reset function for OPAT Trip (QPNL, QPPL) and j rates of trip setpoint decrease per percent AI (QPNS, l QPPS) 3/4.1.1.3 Moderator Temperature Coefficient (MTC) 3/4.1.3.5 Shutdown Rod Insertion Limit 3/4.1.3.6 Control Rod Insertion Limits 3/4.2.1 Axial Flux Dif ference (AFD) 3/4.2.2 Heat Flux Hot Channel Factor (Fg(x,y,z))

3/4.2.3 Nuclear Enthalpy Rise Hot Channel Factor (Fag (x,y))

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

The following abbreviations are used in this section:

BOL stands for Beginning of Cycle Life ARO stands for All 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-measured MTC limit), establish control rod withdrawal limits to ensure the MTC renmins less positive than 0 Ak/k/*F for all times in core life.

SEQUOYAH - UNIT 1 Page 2 of 12 Revision O t

,_ _ ~____._._.__m.. _

._.._._...m.___.._______-._._.._.__ _ . . _ . _ . _ . _ . _ . . - -

i l 1 - j g * .I

. I i

COLR FOR SEQUOYAH UNIT 1 CYCLE 9  !

I i

+

l The EOL/ARO/RTP-MTC shall be less negative than or equal to -4.5 x '

-4 3' 10 Ak/k/'F.

f. 2.1.2 The 300 ppm surveillance limit is:

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

l equal to -3.75 x 10'4- Ak/k/*F.  !

2.2 Shutdown Rod Insertion Limit (Specification 3/4.1.3.5) 2.2.1 The shutdown rods shall be withdrawn to a position as defined j

r below:

Cycle Burnup (MWD /MTU) Steps Withdrawn ,

l

$ 4,000 > 225 to 5 231 j

> 4,000 to < 14,000 > 222 to 5 231 l

> 14,000 > 225 to < 231 .

I 2.3 Control Rod Insertion Limits (Specification 3/4.1.3. 6) 2.3.1 The control rod banks shall be limitec in physical insertion as l shown in Figure 1. ]

I 2.4 Axial Flux Difference - AFD (Specification 3/4.2.1)

]

2.4.1 The axial flux difference (AFD) limits (AFDLimit)are provided in Figure 2.

l 2.5 Heat Flux Hot Channel Factor - F (X,Y, g Z) .( Specification 3/4.2.2)

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

p RTP Eg(X,Y,Z) s

  • K(Z) for P > 0.5 )

P RTP Fg Eg(X,Y,Z) s

  • K(Z) for P s 0.5 0.5 l

THERMAL POWER where P =

RATED THERMAL POWER SEQUOYAH - UNIT 1 Page 3 of 12 Revision 0

_ _ _ - - - . ~, . .- - _ _ - . - -

- - . - - . ~ . - - . . . . - - - . ~.- .. - - .- . ... - .-~ ~ . -. _ . - -~-- ..

  • l no

' ^

COLR FOR SEQUOYAH UNIT 1 CYCLE 9

~

2.5.1 FgRTP = 2.50 for Mark-BW fuel FgRTP = 2.40 for Westinghouse fuel 2.5.2 K(Z)11s provided in Figure 3 for Mark-BW fuel.

K(Z) is provided in Figure 4 for Westinghouse fuel. l l

The following parameters are required for core monitoring per the Surveillence Requirements of Specification 3/4.2.2:  ;

1 2.5. 3 NSLOPEAFD = 1.08 5

wnere NSLOPEAFD = Negative AFD limit adjustment required to ]

compensate for each 1% that Fg(X,Y,Z) exceeds l BQDES.

2.5.4 PSLOPEAFD = 0.89 where PSLOPEAFD = Positive AFD limit adjustment required to compensate for each 1% that Fg(X,Y,Z) exceeds BQDES.

l i

2.5.5 NSLOPEf 2 ( AI) = 1.52 where NSLOPE f 2(AI) = Adjustment to negative OPAT 2 f (AI) limit required to compensate for each 1% that Fg(X,Y,Z) exceeds BCDES.

2.5.6 PSLOPE 2f IAII = 1.73 I

where PSLOPE f 2(AI) = Adjustment to positive OPAT 2 f (AI) limit required to compensate for each 1% that Fg(X,Y,Z) exceeds BCDES.

2.5.7 BQNOM(X,Y,Z) = Nominal design peaking factor, increased by an allowance for the expected deviation between the nominal design power distribution and the measurement. ,

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

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

SEQUOYAH - UNIT 1 Page 4 of 12 Revision 0

COLR FOR SEQUOYAH UNIT 1 CYCLE 9 BQNOM(X,Y,Z), BQDES(X,Y,Z), and BCDES(X,Y,Z) data bases are provided for input to the plant power distribution analysis codes i on a cycle specific basis and are determined using the methodology for core limit generation described in the references in Specification 6.9.1.14.

2.5.10 All cycle burnups shall use a 2% increase in Fg M(X, Y, Z) margin for compliance with the 4.2.2.2.e Surveillance Requirements. l 2.6 Nuclear Enthalpy Rise Hot Channel Factor - F Ag(X,Y)

(Specification 3/4.2.3)

FAH(X,Y) shall be limited by the following relationship: 1 FAH(X,Y) $ 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.

l AXIAL (X,Y) is the axial peak from the normalized axial power 1 shape.  !

l The following parameters are reaci. red for core monitoring per the '

Surveillence Requirements of speci'.ication 3/4.2.3:

FAHRM(X,Y) $ BHNOM(X,Y) l where FAHR M (X,Y) =FAH(X,Y) / MAPM / AXIAL (X,Y) l FAH (X, Y) is the measured radial peak at location X,Y.

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

2.6.2 BHNOM(X,Y) = nominal design radial peaking factor, increased by an allowance for the expected deviation between 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 for operation within the LCO limits, including allowances for calculational and measurement uncertainties.

2.6.4 BRDES(X,Y) = maximum allowable design radial peaking factor 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 - UFiIT 1 Page 5 of 12 Revision 0

a

~ COLR FOR SEQUOYAH UNIT 1 CYCLE 9 1

BHNOM(X,Y), BHDES(X,Y) and BRDES(X,Y) data bases are provided for input to the plant power distribution analysis computer codes on a cycle specific basis and are determined using the methodology for core limit generation described in the references in Specification 6.9.1.14.

2.6.5 RRH = 3. 34 when 0. 8 < P $ 1. 0 RRH = 1. 67 when P < 0. 8 -

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

P = Thermal Power / Rated Thermal Power

~2.6.6 TRH = 0. 034 when 0. 8 < P < l. 0 TRH = 0.017 when P $ 0. 8 where TRH = Reduction in OTAT K1 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 j 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 Overtemperature Delta T-Trip (Specification 2.2.1) l The following parameters are required to specify'the power level-dependent f t (AI) trip reset' term limits for the Overtemperature Delta-T trip function

  • I 3.1.1 QTNL = -23% ]

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

3.1.2 QTPL = +5%

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

3.1.3 QTNS = 2.50%

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 themal power (QTNL) .

SEQUOYAH - UNIT 1 Page 6 ef 12 Revision 0

I COLR FOR SEQUOYAH UNIT 1 CYCLE 9 3.1.4 QTPS = 1.20% l where QTPS = the percent reduction in overtemperature Delta-T trip setpoint for each percent that the magnitude of AI exceeds its positive limit at rated themal power

+

(QTPL). l 3.2 Trip Reset Term [ fr(AI) ] for 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 i function: ,

3.2.1 QPNL = -35%

.where QPNL = the maximum negative AI setpoint at rated thermal I power at which the trip setpoint is not reduced by 1 the axial power distribution. l 3.2.2 QPPL = +28% i 1

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

l 3.2.3 QPNS = 1.50% I 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 themal power '

(QPNL).

3.2.4 QPPS = 1.70%

~

where QPPS = the' percent reduction in Overpower Delta T trip setpoint for each percent that the nagnitude of AI.

exceeds its positive limit at rated themal power (QPPL).

1 l

SEQUOYAH - UNIT 1 Page 7 of 12 Revision 0  ;

-,~. .

. . . . . - . - , , _ . . - _ _ _ _ _ . . _ _ - . . . _ . . _ _--_._...._.m__ _.._,_m.m..m.m.m_ .

COLR FOR SEQUOYAH UNIT 1 CYCLE 9 4

Table 1 l

i Maxianua Allowable Peaking Limits MAP (X,Y,Z) a 1

Mk-BW Fuel W Fuel '

i Elevation (ft) AXIAL (X.Y) MAP (X,Y,Z) MAP (X Y,Z) i 2 1.1 1.970 1.899 4 1.966 1.897 ,

,1-6 1.958 1.893

8 1.945 1.881 '

10 1.917 1.851  !

i

2 1.2 2.208 2.135 4 2.197 2.131 l 6- 2.180 2.119. I

$ 8 2.150 2.092 10 2.072 1.991 2 1.3 2.453 2.378

4 2.434 2.372 '

6 - 2.406 2.339 i

8 2.315 2.219 I 10 2.185 2.100 l

.i

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 l

! 2 1.5 2.956 '2.777

4 2.826 2.664

, 6 2.683 2.538 i 8 2.529 2.405 10 2.381 2.269 2 1.7 3.162 2.911 4 3.007 2.804 6 2.850 2.685 j 8 2.690' 2.542.

10 2.542 2.413  !

i

~

2 1.9 3.283 3.004 4- 3.133 2.916

6 2.982 2.805 8 2.821 2.659 10 2.685 2.532

{

4 t

4

?

1 f

)'. . COLR For Sequoyah Unit 1 Cycle 9

(.65,231) 2 3 1 (.09,231)

,' (Fuuy Withdrawn Region)* . , ' .

l 220 y(.O s,22 w ----

, t.s t,22 2r , - - -

/o BANK B (0,210) -

a 200 --i---- - -;  ; --

(1.0,182)

3g0 - . . . . ; . . . . . . .
......:. ....:.....

4  :  :  :  :

c160 --- - -~- --

,o . . . .

8 140 - - - - - --

) A o BANK C  : .

3120 CrJ

, y . . . .

5100 i-i m -

1

, y go -.(0,as) 1 m . . .

i o BANK D g

j .....

3 .. .., . ....... . . , . . ....

gg 20 - - - - - ' - -

(.19,0) - j j j 0 0.2 0.4 0.6 0.8 1 (Fully 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 poeltion within the interval of 2.222 and 1231 steps withdrawn, inclusive. {

I Fully withdrawn shall be the position as defined below,

]

cvele Burnuo (mwd /MTU) Sten Withdrawn I

1 4000 2.225 to 1231  !

> 4000 to < 14,000 2.222 10 1 231 I 2.14.000 2. 225 to 1231 I l

1 SEQUOYAH - UNIT 1 Page 9 of 12 Revision 0

l 1

l COLR For Sequoyah Unit 1 Cycle 9 l

i 4

i i

120 . . . . . . . .

} .........4 . s ... . . . . e .. .....s. .

i

. . (413,100) (5,100' ) . . .

100 - '

90 unac'ceptable ' - - : --

.- unnec'epta6le -

g Op:eration  ; Ope, ration g 80 -

- - -: - +  :--  :- + - : - - -: - -

n., .

Accept able - . . .

Operation .

<

  • 70 - - - . .-

E w

i . . . . . . . . 1 O . . . . . . . l c 60 -- -

i  :  :-  :

'. - - - l. -

g . . . . .

g . . . . . . i

% 50 -- - -.- - ---- - -- --- l EC (-44,'50) :  :  :  : (31',50) : 1

O 40 - -
-  :- ,- ,-- --: -: -::-

g .

30 . . . . . . . . .... .

20 -- - : -: - i  : - - -: - ?-- '-  :--

10 -.

I I I I I I I f O

40 20 -10 0 10 20 30 40 50 Flux Difference (delta 1) %

FIGURE 2 Axial Flux Difference Limits As A Function Of Rated Thermal Power SEQUOYAH - UNIT 1 Page 10 of 12 Revision 0

J 4

COLR For Sequoyah Unit 1 Cycle 9 I

4 1.2 . . . . .

3 4 . . . .

4 . . . .

4 . . . . .

1 2.5 1 . . . . .

0.8 -- -

-:- ---i - --: -: - --

2 2 . . . . . O j

m 4

. . . . . g

:  :  : c
U g,g - . . . . . . . . . . . .
. . . . . . . . . . . . ; .3,5 . . .y. . :. . . . . .

M . . . W e

a

.a OA - - - - - - - - - - - - - - - - - -

1 H

0 1

Elevation K(Z)

FO 0.0 0'0 ft .

1.000 2.500 6.28.S ft 1 .0 0 0 2 .S.0 0

  • 02 - - - - -l - ---- -

7.99'S ft 0.b66 2.415- - - -

- l- - - - - --O'5

9.7 0.S ft 0 . 9 2 0 2 . 3.0 0  :

12.000 ft .

0 .'8 5 8 2 .1:4 5 0 O O 2 4 6 8 10 12 i Core Height (Feet)

FIGURE 3 t

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

SEQUOYAH - UNIT 1 Page 11 of 12 Revision 0

?

COLR For Sequoyah Unit 1 Cycle 9 4

I i

1.2 . . . . .

l

. . . . 1 2.5 j ....l.....l...

t . .

2 O.8 --

-: -: + --:--- .- - -

3 . . . . . O u.

tn e

6 0 .6 - - - '

1'5 -

x x  :  :  :  :  : m

. . . . . e

:  :  :  : E a

3 0.4 --

>O Elevation : KlZ) : FO .

0.0'00 ft :1 .0 0 0 2 .4 0 0  :

' 6.0.00

- - - ft- ;1.000 2.400 '

O2 - . - - -

10.800 ft 0 .9 4 0 :2 .2 5 6 :

O*5 12.Q00 ft

0.925 2.220 :

0 O O 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) 3 4

SEQUOYAH - UNIT 1 Page 12 of 12 Revision 0

Retrieved from "https://kanterella.com/w/index.php?title=ML20148A634&oldid=2850019"