ML20095L008
| ML20095L008 | |
| Person / Time | |
|---|---|
| Site: | Seabrook  |
| Issue date: | 12/12/1995 |
| From: | NORTH ATLANTIC ENERGY SERVICE CORP. (NAESCO) |
| To: | |
| Shared Package | |
| ML20095L004 | List: |
| References | |
| RE-21, RE-21-R01, RE-21-R1, NUDOCS 9512290383 | |
| Download: ML20095L008 (16) | |
Text
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RE-21 CORE OPERATING LIMITS REPORT
- i CYCLE 5 i
l COLR I
RE DEPT SUPERVISOR 88
' 2/'Ok OPERATIONS MANAGE ho /d #5 y pies 11o 's oirs REVISION 01-05-01 DR ADO OO 43 P
l RE-21 Rev 01-05-01 8
1.0 Core Operating Limits Report 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.
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 Insenion 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 Overt:mperature AT Trip Setpoint Parameters and Function Modifier:
- 2. 1.1.1 K = 1.145 i
i 2.1.1.2 K = 0.020 / 'F 2
2.1.1.3 K = 0.001/ psig 3
e.'
RE-21 Rev 0105-01 Page 3 of 16:
2.1.1.4 Channel Total Allowance (TA) = N.A.
.T.1.1.5 Channel Z = N.A.
2 p
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
_.i 4i
.Setpoint by more than 2.2% of AT span (150 PU._AT).
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 cn measured instrument response during plant startup tests. F (AI) is specified in Figure 1.1.
i 4
2.1.2 Cycle Dependent Overpower AT Trip Setpoint Parameters and Function Modifer:
2.1.2.1 K, = 1.070 2.1.2.2 K, = 0.020 / P for increasing average temperatere and K = 0.0 for decreasing average _
3 temperature.
2.1.2.3 K = -0.00196 / P for T > T" and K = 0.0 for T s T", where:
T=,
Average temperature (T), and T" =
Indicated T,,, at RATED THERMAL POWER (Calibration temperature for AT instrumentation s 588.5 P).
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 2.1% of AT span (150 PU._AT).
RE-21 Rev 0105-01 l
Page 4 of 16 2.1.2.8 F (AI) is a function of the indicated difference between top and bottom detectors of 2
the power-range nectron 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 Lhnit 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 For MODE 5: (Specification 3.1.1.2)
The Shutdown Margin shall be greater than or equal to 1.8 % AK/K.
~
Y 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 10-5 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 Innrtion 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.
s*
RE-21 Rev 01-05-01 Page 5 of 16 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 1
surveillance requirements 4.2.2.2 and 4.2.2.4 is specified in Figure 4.1.
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)
He limits on F"3, are specified in Figure 5. He limits apply to F AH measured using either N
the fixed or movable incore detectors since a bounding measurement error has been allowed for in determination of the design DNBR limit value.
RE-21 Rev 01-05-01 '
- Page 6 of 16 I I I i Coordinates 14.0, 0.0 60.0, 54.8 80 70 60 C
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SEABROOK STATION CYCLE 5 Axial Flux Imbalance CORE OPERATING LIMITS REPORT Penalty Function 2
FIGURE 1.1 4
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l RE-21 Rev 01-05-01 Page 7 of 16 150 i I I i s
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~ 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.
p Rod Bank insertion Umits versus Thermal Power SEABROOK STATION CYCLE 5 Four-Loop Operation CORE OPERATING LIMITS REPORT FIGURE 2 l
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RE-21 Rev 01-05-01 Page 9 of 16 i
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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 OPERABLE FIGURE 3.1
't-RE-21
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RE-21 Rev 01-05-01 Page 11 of 16 2.6 2.5
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9 10 11 12 Core Height (Feet) i F (Z) Limit As A Function of Core Height SEABROOK STAllON CYCLE 5 f8r Operation with
. CORE OPERATING LIMITS REPORT Fixed incore Detector System Alarm OPERABLE FIGURE 4.1
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RE-21 Rev 01-05-01 Page 12 of 16 2.2 i
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F (Z) Limit As A Function of Core Height n
f5r Operation with SEABROOK STATION CYCLE 5 Fixed incore Detector System Alarm inoperable CORE OPERATING LIMITS REPORT and Cycle Average Bumup < 8.0 GWD/Mtu FIGURE 4.2
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RE-21 Rev 01-05-01 Page 13 of 16 2.2 2.1 g
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-j for Operationwith SEABROOK STATION CYCLE 5 Fixed incore Detector System Alarm Inoperable
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CORE OPERATING LIMITS REPORT and Cycle Average Bumup 8.0 to 14.0 GWD/Mtu FIGURE 4.3 i
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j RE-21 Rev 01-05-01 i
Page 14 of 16 2.2
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F (Z) Limit As A Function of Core Height fb 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
RE-21 Rev 01-05-01 Page 15 of16 i
K(Z) x F;"
Height (feet)
< 8.0 GWD/Mtu 8.0-14.0 GWD/Mtu
> 14.0 GWD/Mtu 0.250 1.931 1.953 1.953 0.750 1.952 1.965 1.965 1.250 1.973 1.986 1.986 1.750 2.000 2.014 2.014 2.250 2.035-2.053 2.053 2.750 2.076 2.103 2.103 3.250 2.050 2.063 1.972 3.750 1.987 1.986 1.843 4.250 1.934 1.917 1.766 4.750 1.913 1.884 1.740 5.250 1.926 1.886 1.736 5.750 1.934 1.859 1.716 6.250 1.917 1.836 1.715 6.750 1.929 1,844 1.718 7.250 1.945 1.875 1.750 7.750 1.951 1.926 1.805 8.250 1.950 1.950 1.853 8.750 1.939 1.941 1.899 9.250 1.927 1.935 1.939 9.750 1.919 1.934 1.968 10.250 1.914-1.933 1.983 10.750 1.906 1.932 1.980 11.250 1.890 1.923 1.962 11.750 1.856 1.890 1.906 Basis: F""- 2.50 a
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SEABROOK STATION CYCLE 5 for Operation with CORE OPERATING LIMITS REPORT Fixed incore Detector System Alarm inoperable FIGURE 4.5
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RE-21 Rev 01-05-01 Page 16 of 16 I
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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)
All-Rods-Out SEABROOK STATION CYCLE 5 Nuclear Enthalpy Rise Hot Channel Factor CORE OPERATING LIMITS REPORT Versus Power Level FIGURE 5
.