ML20196L208

Rev 01-07-00 to RE-21, Cycle 7 Colr

ML20196L208
Person / Time
Site:	Seabrook
Issue date:	04/19/1999
From:	NORTH ATLANTIC ENERGY SERVICE CORP. (NAESCO)
To:
Shared Package
ML20196L202	List: ML20196L200 ML20196L208
References
RE-21-03, RE-21-3, RE-21-R01-07-00, RE-21-R1-7, NUDOCS 9905270227
Download: ML20196L208 (20)

Text

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' RE-21 CORE OPERATING LIMITS REPORT l

CYCLE 7 1

COLR l

l RE DEPT SUPERVISOR Mb k f/h/97 l OPERATIONS MANAGER N#~ 4 Vf/7[17 l SIGNATURE DATE REVISION 01-07-00 i

9905270227 990507 PDR ADOCK 05000443 P PDR l

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. RE-21 Rev. 0107-00 Page 2 of 20 1.0 Core Operating Limits Report This Core Operating Limits Report for Seabrook Station Unit 1, Cycle 7 has been prepared in recordance with the requirements of Technical Specification 6.8.1.6.

The Technical Specifications affected by this report are:

1) 2.2.1 Limiting Safety System Settings

2) 3.1.1.1 Shutdown Margin Limit for MODES 1,2,3,4

3) 3.1.1.2 Shutdown Margin Limit for MODE 5

4) 3.1.13 Moderator Temperature Coefficient

5) 3.1.3.5 Shutdown Rod Insertion Limit

6) 3.1.3.6 Control Rod Insertion Limits

7) 3.2.1 Axial Flux Difference

8) 3.2.2 Heat Flux Hot Channel Factor

9) 3.2.3 Nuclear Enthalpy Rise Hot Channel Factor 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 Technical Specification 6.8.1.6.

2.1 Limiting Safety System Settings: (Specification 2.2.1) 2.1.1 Cycle Dependent Overtemperature AT Trip Setpoint Parameters and Function Modifier:

2.1.1.1 Ki = 1.180 2.1.1.2 K2 = 0.024 / *F 2.1.1.3 . K3 = 0.0018 / psig i T= Indicated T,vg (*F), and

. RE-21 Rev. 0107-00 Page 3 of 20 T' = Indicated T,v, at RATED THERMAL POWER (Calibration temperature for AT instrumentation,5 588.5'F).

2.1.1.4 Channel Total Allowance (TA) = N.A.

2.1.1.5 Channel Z = N.A.

2.1.1.6 Channel Sensor Error (S) = N.A.

2.1.1.7 Allowable Value - The channel's maximum Trip Setpoint shall not exceed its computed Trip Setpoint by more than 2.6% of AT span.

2.1.1.8 F i (AI) is a function of the indicated difference between top and bottom detectors of the power-range neutron ion chambers with gains to be selected based on measured instrument response during plant startup tests. F (AI)is specified in Figure 1.1.

2.1.2 Cycle Dependent Overpower AT Trip Setpoint Parameters and Function Modifier:

2.1.2.1 L = 1.087 2.1.2.2 K3 = 0.020 / 'F for increasing average temperature and K5 = 0.0 for decreasing average temperature.

2.1.2.3 = 0.00215 / 'F for T > T" and L = 0.0 for T $ T", where:

1 T= Indicated T. , (*F), and T" = Indicated T,v, at RATED THERMAL POWER (Calibration temperature for AT instrumentation,5 587.5 'F).

RE-21 Rev,01-07-00 Page 4 of 20 2.1.2.4 , Channel Total Allowance (TA) = N.A.

2.1.2.5- Channel Z = N.A.

2.1.2.6 Channel Sensor Error (S) = N.A.

2.1.2.7 Allowable Value - The channel's maximum Trip Setpoint shall not exceed its computed Trip Setpoint by more than 2.6% of AT span.

2.1.2.8 F2(AI) is a function of the indicated difference between top and bottom detectors of the power-range neutron ion chambers with gains to be selected based on measured instrument response during plant startup tests. F2 (AI) is specified in Figure 1.2.

2.2 Shutdown Margin Limit for MODES 1,2,3, and 4: (Specification 3.1.1.1)

A) The Shutdown Margin shall be greater than or equal to 1.3% AK/K, in MODES 1,2,3.

B) The Shutdown Margin shall be greater than or equal to 2.1% AK/K, in MODE 4.

2.3 Shutdown Margin Limit for MODE 5: (Specification 3.1.1.2)

The Shutdown Margin shall be greater than or equal to 2.1% AK/K.

2.4 Moderator Temperature Coefficient: (Specification 3.1.1.3) l 2.4.1 The Moderator Temperature Coefficient (MTC) shall be less positive than +1.85 x 10

l AK/K/ F for Beginning of Cycle Life (BOL), All Rods Out (ARO), Hot Zero Thermal Power l conditions.

2.4.2 MTC shall be less negative than -4.7 x 10-4 AK/K/ F for End of Cycle Life (EOL), ARO, Rated Thermal Power conditions.

i L

RE-21 Rev. Ol-07-00 Page5of20 2.4.3 The 300 ppm ARO, Rated Thermal Power MTC shall be less negative than -3.8 x 10" AK/K/'F (300 ppm Surveillance Limit).

2.5 Shutdown Rod Insertion Limit: (Specification 3.1.3.5) 2.5.1 - The shutdown rods shall be fully withdrawn. The fully withdrawn position is defined as the interval within 225 steps withdrawn to the mechanical fully withdrawn position inclusive.

2.6 Control Rod Insertion Limits: (Specification 3.1.3.6) 2.6.1 The control rod banks shall be limited in physical insertion as specified in Figure 2.

2.7 Axial Flux Difference: (Specification 3.2.1) 2.7.1 For operation with the Fixed Incore Detector Alarm OPERABLE, the indicated AFD must be within the Acceptable Operation Limits specified in Figure 3.1.

2.7.2 For operation with the Fixed Incore Detector Alarm inoperable, the indicated AFD must be within the Acceptable Operation Limits specified in Figure 3.2.

2.8 Heat Flux Hot Channel Factor : (Specification 3.2.2) 2.8.1 F""o = 2.50 2.8.2 For operation with the Fixed Incore Detector Alarm OPERABLE, K(Z) is specified in Figure 4.1.

2.8.3 For operation with the Fixed Incore Detector Alarm inoperable, K(Z) is specified in Figures 4.2 to 4.8.

l t..... .

RE-21 Rev. 01-07-00 Page 6 of 20 2.9 : Nuclear Enthalpy Rise Hot Channel Factor: (Specification 3.2.3)

N N The limits on F H are specified in Figure 5. The limits apply to F AH measured using either the fixed or movable incore detectors since a bounding measurement error has been allowed for in determination of the' design DNBR' limit value.

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> CORE OPEPATING LIMITS REPORT FIGURE 1.1 l

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CORE OPERATING LIMITS REPORT FIGURE 1.2

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,- RE-21 Rev. Ol 07-00 Page 9 of 20 225 f ,g.371 ppgg f gg_773. 99gg

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0 0.0 0.2 0.4 0.6 0.8 1.0 Fraction of Rated Thermal Power Bank A must be fully withdrawn

• prior to power operation.

• Fully Withdrawn is defined as the All-Rods-Out position. The control rod insertion limits have been revised to permit ARO repositioning between 225 and 231 steps withdrawn.

Rod Bank Insertion Limits versus Thermal Power l SEABROOK STATION CYCLE 7 Four-Loop Operation l CORE OPERATING LIMITS REPORT FIGURE 2 ,

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CORE OPERATING LIMITS REPORT Fixed incore Dstector System Alarm OPERABLE  !

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RE-21 Rev. Ol-07-00 Page 11 of 20 120  ; ; ; ;

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FIGURE 3.2

RE-21 Rev. OI-07-00 Page 12 of 20 2.6 2.5 ,

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1 Fo(Z) Limit As A Function of Core Height fdr Operation with SEABROOK STATION CYCLE 7 Fixed incore Detector System Alarm OPERABLE CORE OPERATING LIMITS REPORT FIGURE 4.1 l.

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F" = 2.50 1.7 1.6 0 1 2 3 4 5 6 7 8 9 10 11 12 l Core Height (Feet)

F (Z) Limit As A Function of Core Height f0r Operation with SEABROOK STATION CYCLE 7 Fixed Incore Detector System Alarm inoperable CORE OPERATING LIMITS REPORT and Cycle Average Burnup < 4.0 GWD/Mtu FIGURE 4.2 i E ___

RE-21 Rev. Ol-07-00 Page 14 of 20 2.2 I

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Fn(Z) Limit As A Function of Core Height fdr Operation with SEABROOK STATION CYCLE 7 Fixed incore Detector System Alarm inoperable CORE OPERATING LIMITS REPORT and Cycle Average Burnup 4.0 to 8.0 GWD/Mtu l- FIGURE 4.3

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F (Z) Limit As A Function of Core Height f0r Operation with SEABROOK STATION CYCLE 7 Fixed incore Detector System Alarm inoperable CORE OPERATING LIMITS REPORT and Cycle Average Burnup 8.0 to 11.0 GWD/Mtu FIGURE 4.4

RE-21 Rev. 01-07-00 Page 16 of 20 1

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Fn(Z) Limit As A Function of Core Height f5r Operation with SEABROOK STATION CYCLE 7 Fixed incore Detector System Alarm Inoperable CORE OPERATING LIMITS REPORT and Cycle Average Burnup 11.0 to 14.0 GWD/Mtu FIGURE 4.5

e RE-21 Rev. Ol-07-00 Page 17 of 20

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for Operation with SEABROOK STATION CYCLE 7 Fixed Incore Detector System Alarm inoperable CORE OPERATING LIMITS REPORT and Cycle Average Burnup 14.0 to 18.89 GWD/Mtu FIGURE 4.6 L

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Fo(Z) Limit As A Function of Core Height

! for Operation with SEABROOK STATION CYCLE 7 Fixed incore Detector System Alarm inoperable CORE OPERATING LIMITS REPORT and Cycle Average Burnup > 18.89 GWD/Mtu FIGURE 4.7

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RE-21 Rev. 01-07-00 Page 19 of 20

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Cycle Average Exposure Bands in GWd/MTU Height (feet) <4 4-8 8-11 11-14 14-18.89 >18.89 11.750 1.980 1.959 1.959 2.034 2.089 2.111 11.250 1.991 1.973 1.973 2.051 2.101 2.146 10.750 2.011 1.986 1.986 2.056 2.107 2.160 10.250 2.029 2.004 2.004 2.050 2.100 2.146 9.750 2.038 2.014 2.014 2.042 2.082 2.123 9.250 2.043 2.010 2.010 2.041 2.068 2.096 8.750 2.060 2.008 2.008 2.035 2.058 2.069 8.250 2.042 1.999 1.999 2.029 1.977 1.977 7.750 2.023 1.956 1.956 1.944 1.869 1.869 7.250 2.011 1.934 1.934 1.878 1.782 1.782 6.750 2.023 1.932 1.891 1.825 1.718 1.718 6.250- 2.050 1.941 1.871 1.796 1.687 1.687 5.750 2.097 1.980 1.885 1.799 1.692 1.692 5.250 2.094 1.997 1.902 1.814 1.692 1.692 4.750 2.072 1.998 1.890 1.799 1.696 1.696 4.250 2.053 2.012 1.918 1.830 1.729 1.729 3.750 2.056 2.042 1.992 1.915 1.824 1.824 3.250 2.079 2.105 2.086 2.056 1.991 1.991 2.750 2.043 2.060 2.079 2.081 2.105 2.115 2.250 2.005 2.024 2.035 2.040 2.088 2.118

'1.750 1.973 1.996 2.001 2.006 2.069 2.130 1.250 1.949 1.972 1.972 1.979 2.055 2.142 0.750 1.922 1.955 1.955 1.959 2.045 2.150 0.250 1.907 1.938 1.938 1.941 2.032 2.142 Basis: F" n

= 2.50 Coordinates for Fq(Z) Limit As A Function of Core Height SEABROOK STATION CYCLE 7 for Operation with CORE OPERATING LIMITS REPORT Fixed Incore Detector System Alarm inoperable FIGURE 4.8

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RE-21 1' Rev. 01-07-00 Page 20 of 20 i

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All-Rods-Out SEABROOK STATION CYCLE 7 Nuclear Enthalpy Rise Hot Channel Factor CORE OPERATING LIMITS REPORT Versus Power Level r

j _\ FIGURE 5 l