ML20141C819
| ML20141C819 | |
| Person / Time | |
|---|---|
| Site: | Seabrook  |
| Issue date: | 06/18/1997 |
| From: | NORTH ATLANTIC ENERGY SERVICE CORP. (NAESCO) |
| To: | |
| Shared Package | |
| ML20141C802 | List: |
| References | |
| NUDOCS 9706260031 | |
| Download: ML20141C819 (20) | |
Text
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9 1
RE-21 CORE OPERATING LIMITS REPORT 4
d 1
CYCLE 6 i
l COLR 4
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RE DEPT SUPERVISOR (c( [ M k 6//G/91 OPERATIONS MANAGER 6
( ///7 NATE
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SIGNATtfRE 4
REVISION 01-06-01 4
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RE-21 Rev. 01-06-01 Page 2 of 20 1.0 Core Operating Limits Report
(
l This Core Operating Limits Report for Seabrook Station Unit 1, Cycle 6 has been prepared in accordance with the requirements of Technical Specification 6.8.1.6.
The Technical Specifications affected by this report are:
l 1) 2.2.1 Limiting Safety System Settings 2) 3.1.1.1 Shutdown Margin Limit for MODES 1,2,3,4 3) 3'.l.1.2 Shutdown Margin Limit for MODE 5 4) 3.1.1.3 Moderator Temperature Coefficient 5) 3.1.3.5 Shutdown Rod Insertion Litrit -
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
_ =. _. _ _ _ _ _ _ _ _. _ _ _.. _ _ ___ ~.... _ _..
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ib RE-21 Rev. 01-06-01 Page 3 of 20 2.1.1.2 K = 0.024 / F 2
2.1.1.3 K = 0.0018 / psig 3
T=
Average temperature ( F), and T" =
Indicated T,,, at RATED THERMAL POWER (Calibration temperature for AT instmmentation s 588.5'F).
2.1.1.4 Channel Total Allowance (TA) = N.A.
4 l
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 (AI) is a function of the indicated difference between top and bottom i
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 = 1.087 4
2.1.2.2 K = 0.020 / F for increasing average temperature and K = 0.0 for 5
5 decreasing average temperature.
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RE-21 2
Rev. 01-06-01 Page 4 of 20 2.1.2.3 K
-0.00215 / F for T > T" and K = 0.0 for T s T", where:
=
6 T=
Average temperature ( F), and T" = Indicated T,., at RATED THERMAL POWER (Calibration temperature for AT instrumentation s 587.5 F).
2.1.2.4 Channel Total '. e ance (TA) = N.A.
2.1.2.5 Channel Z = N.A.
2.1.2.6 Channel Sensor Error (S) = N.a.
j 2.1.2.7 Allowable %tlue - The channel's maximum Trip Fetpoint shall not exceed its computed Trip Setpoint by more than 2.6% of AT span.
2.1.2.8 F (AI) is a function of the indicated difference between top and bottom 2
detectors of the power range neutron ion chambers with gains to be selected based on measured instrument response during plant startup tests.
1 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 Margiu sL:41 be greater than or equal to 1.9 % 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 tv 1.9 % AK/T L
., -. _ - - ~..
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RE-21 Rev. 01-06-01 Page 5 of 20 l
i 2.4 Moderator Temperature Coefficient: (Specification 3.1.1.3) 2.4.1 The Moderator Temperature Coefficient (MTC) shall be less positive than +1.16 x 10 5
)
AK/K/ F for Beginning of Cycle Life (BOL), All Rods Out (ARO), Hot Zero Thermal Power conditions.
4 4
~2.4.2 MTC shall be less negative than -4.7 x 10 AK/K/ F for End of Cycle Life (EOL), ARO, Rated Thermal Power conditions.
i' 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 Qin % fully withdrawn. The fully withdrawn position is defined as the interval within 225 steps withdrawn to the mechanical fully withdrawn position inclusive.
i 2.6 Control Rod Insertion Limits: (Specification 3.1.3.6) i 1.6.1 The control rod banks shall be limited in physical insertion as specified in Figure 2.
1; 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 Fisare 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.
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RE-21 Rev. 01-06 01 Page 6 of 20 2.8 Heat Flux Hot Channel Factor: (Specification 3.2.2) 2.8.1 F "q = 2.50 R
2.8.2 For operation with the Fixed Incore Detector Alarm OPERABLE, K(z) is specified in Figure 4.1.
1 j
2.8.3 For operation with the Fixed Incore Detector Alarm inoperable, K(z) is specified in i
Figures,4.2 - 4.8.
2 i
l 2.9 Nuclear Enthalpy Rise Hot Channel Factor: (Specification 3.2.3)
The limits on F"in are specified in Figure 5. The limits apply to FNAH 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 6 Axial Flux Imbalance CORE OPERATING LIMITS REPORT Penalty Function FIGURE 1.1
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Rev, 01 01 Page 8 of 20 i
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SEABROOK STATIOld CYCLE 6 Axial Flux Imbalance CORE OPERATING LIMITS REPORT Penalty Function FIGURE 1.2
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0 0.0 0.2 0.4 0.6 0.8 1.0 Fraction of Rated Thermal Power Banks A and B must be fully withdrawn' prior to power operation.
- Fully Withdrawn is defined as the All-Rods-Out position. The control rod lasertion limits have been revised to permit ARO repositioning between 225 and 231 steps withdrawn.
Rod Bank insertion Limits versus Thermal Power SEABROOK STATION CYCLE 6 Four-Loop Operation CORE OPERATINF ' lMITS REPORT FIGURE 2
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RE-21 Rev. 01-06-01 Page 10 of 20 l l l l Coordinates 110
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as a Function of Rated Thermal Power SEABROOK STATION CYCLE 6 for Operation With CORE OPERATING L!MITS REPORT Fixed Incore Detector System Alarm OPERABLE FIGURE 3.1
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' Axial Flux Difference Limits as a Function of Rated Thermal Power SEABROOK STATION CYCLE 6 for Operation With CORE OPERATING LIMITS REPORT Fixed incore Detector System Alarm inoperable FIGURE 3.2
.l' RE-21 Rev. 01-06-01 Page 12 of 20 2.6 2.5
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Basis: F"" = 2.50 2.1 Coordinates 0.00,2.5000 6.00,2.5000 12.00,2.3125 2.0 0
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9 10 11 12 Core Height (Feet)
F (Z) Limit As A Function of Core Height n
fdr Operation with SEABROOK STATION CYCLE 6 Fixed incore Detector System Alarm OPERABLE CORE OPERATING LIMITS REPORT FIGURE 4.1
RE-21 Rev. 01-06-01 l
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SEABROOK STATION CYCLE 6 Fixed incore Detector System Alarm inoperable j
CORE OPERATING LIMITS REPORT and Cycle Averrge Bumup < 3.0 GWD/Mtu l
FIGURE 4.2 i
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F (Z) Limit As A Function of Core Height n
fdr Operation with SEABROOK STATIOllCYCLE 6 Fixed incore Detector System Alarm inoperable CORE OPERATING LIMITS REPORT and Cycle Average Bumup 3.0 to 8.0 GWD/Mtu FIGURE 4.3
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Rev. 01-06-01 Page 15 of 20 2.2 1
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F (Z) Limit As A Function of Core Height fOr Operation with SEABROOK STATION CYCLE 6 Fixed Incore Detector System Alarm Inoperable CCRE OPdrmTING LIMITS REPORT and Cycle Average Bumup 8.0 to 12.0 GWD/Mtu FIGURE 4.4
l' R E-21 Rev. 01-06-0 I Page 16 of 20 2.2 An 2.1 j
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F (Z) Umit As A Function of Core Height f8r Operation with SEABROOK STATION CYCLE 6 Fixed Incore Detector System Alarm inoperable CORE OPERATING LIMITS REPORT and Cycle Average Bumup 12.0 to 16.0 GWD/Mtu FIGURE 4.5
RE-21 Rev. 01 01 Page 17 of 20 I
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fdr Operation with SEABROOK STATION CYCLE 6 Fixed Incore Detector System Alarm inoperable CORE OPERATING LIMITS REPORT and Cycle Average Bumup 16.0 to 20.0 GWD/Mtu FIGURE 4.6
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for Operation with SEABROOK STATION CYCLE 6 Fixed Incore Detector System Alarm inoperable CORE OPERATING LIMITS REPORT and Cycle Average Burnup > 20.0 GWD/Mtu FIGURE 4.7
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.N RE.21 Rev, Ol.06 0I Page 19 of 20 K(Z) x Fag Cycle Average Exposure Bands in Gwd/MTU Height (feet)
<3 3-8 8-12 12-16 16-20
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11.750 1.997 1.918 1.918 1.952 2.029 2.084 11.250
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4.750-2.101 2.122 1.991 1.893 1.804 1.719 4.250 2.059 2.111 1.999 1.924 1.860 1.746 3.750 2.040 2.090 2.044 2.006 1.967 1.835 3.250 2.039 2.060 2.124 2.125 2.097 1.977 2.750 2.043 2.043 2.079 2.079 2.09.2 2.100 2.250 2.002 2.002 2.032 2.032 2.043 2.063 1.750 1.972 1.972 1.996 1.996 2.006 2.033 1.250 1.950 1.950 1.969 1.969 1.980 2.006 0.750 1.920 1.920 1.951 1.951 1.957 1.983 0.250 1.907 1.907 1.934 1.934 1.937 1.964 Basis: Q = 2.50 Coordinates for F (Z) Limit As A Function of Core Height q
SEABROOK STATION CYCLE 6 for Operation with CORE OPERATING LIMITS REPORT Fixed Incore Detector System Alarm inoperable FIGURE 4.8
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