ML20217G249

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Rev 14 to Cycle 17 COLR, Revising COLR Peaking Factors to Ensure Appropriate Conservatism Is Applied
ML20217G249
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Site: Fort Calhoun Omaha Public Power District icon.png
Issue date: 02/28/1998
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OMAHA PUBLIC POWER DISTRICT
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NUDOCS 9804020255
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Fort Calhoun Station UnR No.1 TDB-VI TECHNICAL DATA BOOK

Title:

CORE OPERATING LIMIT REPORT FC-68 Number: 53028 Reason for Change: Revise COLR peaking factors to ensure appropriate conservatism is applied (CR 199800296).

Contact Person: M. Guinn l

t ISSUED: 02-28-98 11:25 pm - R14 9004020255 980323 PDR ADOCK 05000285 P PDR

FORT CALHOUN STATION TDB-Vi TECHNICAL DATA BOOK PROCEDURE PAGE 1 OF 17 Fort Calhoun Station, Unit 1 Cycle 17 Core Onoratina Limits Renort Due to the critical aspects of the safety analysis inputs contained in this report, changes may not be made to this report without concurrence of the Nuclear Engineering Department.

i

_ J R14

't :( p t FO!"T CALHOUN STATION TDB-VI TECHNICAL DATA BOOK PROCEDURE PAGE 2 OF 17 TABLE OF CONTENTS Jtem Descriction EaQA 1.0 Introduction 5 2.0 Core Operating Umits 5 3.0 ' TM/LP Umit 6 4.0 Maximum Core inletTemperature 6 S.0 Power Dependentinsertion Urnit 7 6.0 Unear Heat Rate 7 7.0 Excore Monitoring of LHR 7 8.0 Peaking Factor (FRT, p,yT) Umits 7 9.0 DNB Monitoring 7 10.0 T 8 Fa,p,yT and Core Power Umitations 11.0 Refuehng Boron Concentration - 8 12.0 Axial Power Distribution 8 t-R14

. FORT CALHOUN STATION - TDB-VI TECHNICAL DATA BOOK PROCEDURE PAGE 3 OF 17 LIST OF TABLES Table No. Idle EAQ2 1 TM/LP Coefficients 6 2 Maximum Fa and Fxy Limits 7 1

1 R14

1 J

FORT CALHOUN STATION TDB-Vi

' TECHNICAL DATA BOOK PROCEDURE PAGE 4 OF 17 l

l LIST OF FIGURES l 1

Figure No. Idla EaQR

.1 Thermal Margin / Low Pressure ,

4 Pump Operation 9 2 Power Dependent insertion Limit 10 3 Allowable Peak Linear Heat Rate vs. Burnup 11 4 Excore Monitoring of LHR 12 5 DNB Monitoring 13 6 BASSS Allowable Power 14 7 T Fa,p,y T and Core Power Limitations 15 8 Axial Power Distribution LSSS for 4 Pump Operation 16 9 Axial Power Distribution Limits for 4 Pump Operation with incores inoperable 17 R14

1 FORT CALHOUN STATION TDB-VI TECHNICAL DATA BOOK PROCEDURE PAGE 5 OF 17 Cycle 17 Core Operatina Limits Report 1.0 Introduction This report provides the cycle-specific limits for operation of the Fort Calhoun Station Unit 1 for Cycle 17 operation. It includes limits for:

1.) TM/LP LSSS 4 Pump Operation (PVAR) 2.) CoreInletTemperature (Tn) i 3.) Power Dependent insertion Limit (PDIL) 4.) Allowable Peak Unear Heat Rate 5.) Excore Monitoring of LHR 6.) Planar Radial Peaking Factor (Fn 7.) Integrated Radial Peaking Factor ( nT) 8.) DNB Monitoring.

T Tversus PowerTrade off curve 9.) Fa /F9 10.) Refueling Boron Concentration 11.) Axial Power Distribution These limits are applicable for the duration of Cycle 17. For subsequent cycles the limits will be reviewed and revised as necessary. In addition, this report includes a number of cycle-specific coefficients used in the generation of certain reactor protective system trip setpoints or allowable increases in radial peaking factors.

2.0 Core Operating Limits All values and limits in this TDB section apply to Cycle 17 operation. Cycle 17 must be operated within the bounds of these limits and all others specified in the Technical Specifications. This report has been preparec in accordance with the requirements of Technical Specification 5.9.5. The values and limits presented within this TDB section have been derived using the NRC approved methodologieslisted below:

OPPD-NA-8301, " Reload Core Analysis Methodology Overview" Rev. 6, dated December 1994. (TAC No. M89455)

OPPD-NA-8302," Reload Core Analysis Methodology, Neutronics Design Methods and Verification" Rev. 4, dated December 1994. (TAC No. M89456)

OPPD-NA-8303, " Reload Core Analysis Methodology, Transient and Accident Methods and Verification", Rev. 04, dated January 1993. (TAC No, M85845) l l

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1 FORT CALHOUN STATION TDB-Vi TECHNICAL DATA BOOK PROCEDURE PAGE 6 OF 17 3.0 TM/LP Limit l

The TM/LP coefficients for Cycle 17 are shown below:

Table 1 Coefficient Value a 29.73 p 18.44 y - 11380 The TM/LP setpoint is calculated by the PVAR equation, shown below and in Figure 1:

PVAR = 29.73 PF(B) A1(Y)B + 18.44Ti n - 11380 PF(B) = 1.0 B 2.100%

= -0.008B + 1.8 50% < B < 100%

= 1.4 B $ 50%

A1(Y) = -0.3529Y3 + 1.0882 Y s 0.25 i

= 0.5714Y3 + 0.857 Yi > 0.25 Where:

B = High Auctioneered thermal (AT) or Nuclear Power, % of rated power Y = Axial Shape Index, aslu Tn i = Core InletTemperature, F PVAR = Reactor Coolant System Pressure, psia 4.0 Maximum Core inlet Temnerature The maximum core inlet temperature (flN) for Cycle 17 shall not exceed 545'F.

This limit is not applicable during either a thermal power ramp in excess of 5% of rated thermal power per minute or a thermal power step greater than 10% of rated thermal power.

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FORT CALHOUN STATION TDB-Vi TECHNICAL DATA BOOK PROCEDURE PAGE 7 OF 17 5.0 Power Dependent insertion Limit The power dependent insertion limit is defined in Figure 2'for Cycle 17 operation.

6.0 Linear Heat Rate The allowable peak iinear heat rate vs. burnup for Cycle 171s 15.5 kW/ft. The allowable peak linear heat rate for Cycle 17 is shown in Figure 3.

7.0 Excore Monitoring of LHR The allowable operation for power versus axial shape index for monitoring of LHR with excore detectors for Cycle 17 is shown in Figure 4.

8.0 Peakina Factor Limits The Cycle 17 maximum full power values for the unrodded planar radial peaking factor (FxyT) and integrated radial peaking factor (FaT) are shown in Table 2.

Table 2 Maximum Full Power Fo and F,~ Limits Peaking Factor Limits T 1.717 FA Fxy T 1.821 9.0 DNB Monitoring The Cycle 17 limits for DNB as a function of axial shape index and core power is shown in Figure 5.

When the Better Axial Shape Selection System is operable, during Cycle 17, the core power is limited as afunction of the axial shape index as shown in Figure 6. Figure 6 will eliminate the need for separate LOCA and fuel performance limits to be maintained by the operators while operating'

. with BASSS.

A14

1

.'g] -

FORT CALHOUN STATION - TDB-VI

. TECHNICAL DATA BOOK PROCEDURE PAGE 8 OF 17 l

- 10.0 F,T, p.,,T an'd Core Power Umitations Core powerlimitations versus Fa7 and FxyT are shown in Figure 7 for' Cycle 17.

11.0 Refue!!na Baron Concentration The refueling boron concentration is required to ensure a shutdown margin of not less than 5%

with all CEAs withdrawn. The boron concentration required to achieve this condition is 2100 ppm prior to reaching a Cycle 17 burnup of 3000 MWD /MTU. Once Cycle 17 bumup reaches 3000 MWD /MTU, the refueling boron concentration can be reduced to 1900 ppm.

i 12.0 Axial Power Distribution The axial power trip is provided to ensure that excessive axial peaking will not cause fuel damage.

The Axial Shape index is determined from the axially split excore detectors. The setpoint functions, shown in Figure 8 ensure that neither a DNBR of less than 1.18 nor a maximum linear heat rate of more than 22 kW/ft (deposited in the fuel) will exist as a consequence of axial power maldistributions. Allowances have been made for instrumentation inaccuracies and uncertainties associated with the excore symmetric offset - incore axial peaking relationship. Figure 9 combines the LHR LCO tent from Figure 4, the DNB LCO tent from Figure 5, and the APD LSSS tent from Figure 8 into one figure for a visual comparison of the different limits.

s 9

m y' I .'

naa

i FORT CALHOUN STATION TDB-V! )

TECHNIGAL DATA BOOK PROCEDURE PAGE 9 OF 17 I 590 Si = -0.06 580 570-

\ \ 3 4 "* \ N

= x x x -a g

,,, x x 2250 psia

\

~

e

~

% ' 2100 psia 5 x o 530-O O -

1750 psia 0 -

510 500 * ' ' '

  • 60 70 80 90 100 110 120 CORE POWER (% OF RATED)

PVAR = 29.73PF(B)A1(Y)B + 18.44 TIN - 11380 PF(B) = 1.0 B 2100%

A1(Y) = -0.3529Y + 1.0882 Y s.25

= .008B + 1.8 50%<B<100% ,

= 1.4 B$50%

CYCLE 17 THERMAL MARGIN / LOW PRESSURE FIGURE COLR 4 PUMP OPERATION - 1 R14 j

1

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FORT CALHOUN STATION TDB-VI TECHNICAL DATA BOOK PROCEDURE PAGE 10 OF 17

~ '**

-l l I I I LONG TERM STEADY STATE '~~~~

I' *)

- 100.8 INSERTION LIMIT ,-

, , (94.5) 93 l ,'

(82.5) 0 - 75.6 g

l l SHORTTERM ,

[

\

l INSERTION LIMIT , .'/, pp

- 126 - 50.4 .

, e l

l ,',

a: - 100.8 - 25.2 l .

/

O

[

l l ',

/,'

< ,/ PDIL or TRANSIENT

' INSERTION LIMIT

[ - 75.6 -0 jill: .,

s g , /,

b - 50.4 ,

- ',- / EMERGENCY BORATION LIMIT (35 2) r 12" BELOW PDIL - REFER TO AOP-3

$ - 25.2 - 126 (25.2)

O (13.2)

H E -0 - 100.8 O

EL.

g [ - 75.6 O g h b - 50.4 6

U - 126 - 25.2

- 100.8 - 0

{ - 75.6 8

$ - 50.4

- 25.2

-0 0 20 40 60 80 100 REACTOR POWER (% OF ALLOWED POWER)

CYCLE 17 POWER DEPENDENT INSERTION LIMIT FIGURE

' COLR

- 2 R14

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FORT CALHOUN STATION TDB-VI TECHNICAL DATA BOOK PROCEDURE PAGE 11 OF 17 18 l

. UNACCEPTABLE OPERATION 16 15.5 KW/FT 14 ACCEPTABLE OPERATION 12 L .

f 10 kE 8

B I

CC 8

6 Z

i 4

1 0

0 5000 10000 15000 20000 BURNUP (MWD /MTU)

CYCLE 17 ALLOWABLE PEAK LINEAR HEAT RATE FIGURE COLR VS.BURNUP - 3 R14

FORT CALHOUN STATION TDB-VI TECHNICAL DATA BOOK PROCEDURE PAGE 12 OF 17 l NOTE: Rodded operation is prohibited above 80% of Rated Thermal Power l 110 100 Rodded Operation Prohibited 90 7 l

(-0.08,85) (0.04,85) 5 A N O 80 (_0.14,80) / (0.1057,80)

CL /

W E 70 .

\

O /

O o

W 60 g

\g 3

O d 50

(-0.5,50) (0.5,50) 4 LL O 4o V

Z W

O 30 E I W I (1.

20  :

10 0

-0.6 -0.4 - 0.2 0.0 0.2 0.4 0.6 AXIAL SHAPE INDEX (ASIU)

CY L EXCORE MONITORING OF LHR I

COLR 4

FORT CALHOUN STATION TDB-VI j TECHNICAL DATA BOOK PROCEDURE PAGE 13 OF 17 110 (0.02,100) (0.15,100)

E

(-0.17,90)

/ \

(0.25,90) l 90 O )

Q. / '

g 80 E

O )

Q 70 0

W (

g 60 r oJ .

J 50

<  ! \

(-0.5,45) (0.5,45) 40 l-Z W

30 O

E W

0- 20 10 0

-0.6 -0.4 - 0.2 0.0 0.2 0.4 0.6 AXIAL SHAPE INDEX (ASIU)

NOTE: WHEN BASSS IS OPERABLE, THIS FIGURE IS SUPERCEDED BY FIGURE 6 -  :

BASSS DNB ALLOWABLE POWER CYCLE 17 FIGURE COLR DNB MONITORING - 5 R14

FORT CALHOUN STATION TDB-Vi TECHNICAL DATA BOOK PROCEDURE PAGE 14 OF 17 110 100

(-0.12,100)

\(0.15,1m).

m W /

/ k L

" )/

\

N

=

O }

/ N N

Q 70 7

O f 60 (~ ~ '

O

-I 50 8C u

40 W

Z W 30 g

m W

0- 20 10 0

-0.6 -0.4 -0.2 0.0 0.2 0.4 0.6

^

~

AXIAL SHAPE INDEX (ASIU)

CYCL I BASSS DNB ALLOWABLE POWER LCO 6 OLR R14

FORT CALHOUN STATION TDB-Vi l TECHNIGAL DATA BOOK PROCEDURE PAGE 15 OF 17 i 110 R A FnT 100 0;s21) i I

I I 90  !

I I

h 80 ,

3 i O I E i m 70 i E I O I I

O o 60 l

W l 3 1 3

J 50 l l

4 1 E I O 40  :

p I Z l m I 30 l W I a l i

20 i l

1 1

10 l

1 I I i 0

1.70 1.75 1.80 1.85 1.90 PEAKING FACTOR I

CYCLE 17 p gT, p*T, AND CORE POWER LIMITATIONS FIGURE COLR - 7 R14 J

FORT CALHOUN STATION TDB-VI  !

TECHNICAL DATA BOOK PROCEDURE PAGE 16 OF 17  ;

I 120 (0,112) 110 A

/\

/ \ (0.15,100) l e ' (-o.1s,100)/ \

i ** / \

O f g 80 /(-o.4,80) ^\

(0.4,80)

O O

O 70 l

W f 5 Y Q 60 J

J 4 50 l

E (-o.6,50) (0.6,50)

O g 40 W

O E 30 W

(1.

20 10

-0.8 -0.6 -0.4 -0.2 0.0 0.2 0.4 0.6 0.8 l AXIAL SHAPE INDEX (ASIU)

CYCLE 17 AXIAL POWER DISTRIBUTION LSSS FIGURE COLR FOR 4 PUMP OPERATION _ 8 R14

.. e FORT CALHOUN STATION TDB-VI TECHNICAL DATA BOOK PROCEDURE PAGE 17 OF 17 1

120

, APD LSSS 110 DNBR / /

MONITORING /

LIMIT

/ (

g' N )

m Q 90 Yv// ( mn MONITORING

) j[

/

(1, LIMIT W f f , /

8*

o >

/J / \(

70 g O So

/ r

\3 ( \

50 IL O [

g 40 W

O 30 Q

20 10 0

-0.8 -0.6 -0.4 -(!.2 0.0 0.2 0.4 0.6 0.8 AXIAL SHAPE INDEX (ASIU)

CYCLE 17 AXlAL POWER DISTRIBUTION LIMITS FOR 4 FIGURE COLR . PUMP OPERATION WITH INCORES INOPERABLE . 9 R14

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