ML20101R087

Cycle 5 Colr

ML20101R087
Person / Time
Site:	Seabrook
Issue date:	03/28/1996
From:	NORTH ATLANTIC ENERGY SERVICE CORP. (NAESCO)
To:
Shared Package
ML20101R045	List: ML20101R044 ML20101R087
References
RE-21, RE-21-R02, RE-21-R2, NUDOCS 9604160050
Download: ML20101R087 (17)

Text

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.c RE-21 CORE OPERATING LIMITS REPORT CYCLE 5 COLR RE DEPT SUPERVISOR 4

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RE-21 Rev. 01-05-02

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-1.0 Core Operating Limits Report Page 2 of 17 This Core Operating Limits Report for Seabrook Station Unit 1, Cycle 5 has been prepared in accordance with the requirements of Technical Specification 6.8.1.6.

h 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 3.1.1.2 Shutdown Margin Limit for MODE 5 3) 4)

3.1.1.3 Moderator Temperature Coefficient 5) 3.1.3.5 Shutdown Rod Insertion Limit i

4 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 4

The cycle-specific parameter limits for the specifications listed in Section 1.0 are presented in the Dilowing 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 K, = 1.145 4

2.1.1.2 K = 0.020 / 'F 2

2.1.1.3 K = 0.001/ psig 3

• . 2.13.4 Channel Totol Allowance (TA) = N.A.

RE-21 Rev. 01-05-02 Page 3 of 17 2.1.1.5 Channel Z = N.A.

l

. 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 2.2% of AT span (150 PU_AT).

I 2.1.1.8 F (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.

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

2.1.2.1 K, = 1.070 2.1.2.2 K = 0.020 / T for increasing average temperature and K = 0.0 for decreasing average 5

5 temperature.

2.1.2.3 K. = -0.00196 / T for T > T" and K. = 0.0 for T s T", where:

T =. Average temperature (T), and T" =

Indicated T,y at RATED THERMAL POWER (Calibration i

temperature for AT instrumentation s 588.5 T).

2.1.2.4 Channel Total Allo.vance (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 2.1% of AT span (150 PU_AT).

RE-21 Rev. 01-05-02 1

Page 4 of 17 2.1.2.8 F (AI) is a function of the indicated difference between top and bottom detectors of 2

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 1.2.

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 1.8 % AK/K in MODE 4.

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

The Shutdown Margin shall be greater than or equal to 1.8 % AK/K.

2.4 Moderator Temperature Coefficient: (Specification 3.1.1.3) 2.4.1 The Moderator Temperature Coefficient (MTC) shall be less positive than +2.19 x 105 AK/K/*F for Beginning of Cycle Life (BOL), All Rods Out (ARO), Hot Zero Thermal Power conditions.

2.4.2 MTC shall be less negative than -4.2 x 10d AK/K/*F for End of Cycle Life (EOL), ARO, Rated Thermal Power conditions.

2.4.3 The 300 ppm ARO, Rated Thermal Power MTC shall be less negative than -3.3 x 10d 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 phys.al insertion as specified in Figure 2.

I

RE-21 Rev. 01-05-02

~

Page 5 of 17 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"*q = 2.50 2.8.2 For operation with the Fixed Incore Detector Alarm OPERABLE, the K(z) used to satisfy surveillance requirements 4.2.2.2 and 4.2.2.4 is specified in Figure 4.1.

2.8.3 For operation with the Fixed Incore Detector Alarm inoperable, the K(z) used to satisfy surveillance requirement 4.2.1.2 is specified in Figures 4.2,4.3,4.4, and 4.5.

2.9 Nuclear Enthalpy Rise Hot Channel Factor: (Specification 3.2.3)

The limits on F% are specified in Figure 5. The limits apply to F% 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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SEABROOK STATION CYCLE 5 Axial Flux Imbalance CORE OPERATING LIMITS REPORT Penalty Function FIGURE 1.1

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7 RE-2 I Rev. O l-05-02 Page 7 of 17 i

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

Rod Bank Insertion Umits versus Thermal Power SEABROOK STATION CYCLE 5 Four-Loop Operation CORE OPERATING UMITS REPORT FIGURE 2 j

RE-21 Rev. 01-05-02 Page 9 of17 120 l l l l Coordinates 110 38.0,50.0 18.0,100.0 100 8.0,100.0

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S RE-21 Rev. 01-05-02 Page 10 0f l7

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Axial Flux Difference Limits as a Function of Rated Thermal Power SEABROOK STATION CYCLE 5 for Operation With CORE OPERATING LIMITS REPORT Fixed Incore Detector System Alarm inoperable FIGURE 3.2

4 RE-21 Rev. 01-05-02

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RE-21 Rev. 01-05-02 Page 12 of 17 2.2 2,1 A

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f5r Operation with SEABROOK STATION CYCLE 5 Fixed incore Detector System Alarm inoperable CORE OPERATING L!MITS REPORT and Cycle Average Bumup 3.0 to 8.0 GWD/Mtu FIGURE 4.2A

O RE-21 Rev. 01-05-02 Page 14 of 17 2.2 2.1

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fcr Operation with SEABROOK STATION CYCLE 5 Fixed incore Detector System Alarm inoperable CORE OPERATING LIMITS REPORT and Cycle Average Bumup 8.0 to 14.0 GWD/Mtu FIGURE 4.3 l

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f5r Operation with SEABROOK STATION CYCLE 5 Fixed incore Detector System Alarm inoperable CORE OPERATING LIMITS REPORT and Cycle Average Bumup > 14.0 GWD/Mtu FIGURE 4.4

t RE-21 Rev. 01-05-02 Page 16 of 17 K(Z) x F{

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~ SEABROOK STATION CYCLE 5 for Operation with i.

CORE OPERATING LIMITS REPORT Fixed incore Detector System Alarm inoperable I

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1 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 Cycle Average Burnup (GWD/MTU) i All-Rods-Out SEABROOK STATION CYCLE 5 Nuclear Enthalpy Rise Hot Channel Factor i

CORE OPERATING LIMITS REPORT Versus Power Level FIGURE 5 1

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