L-14-107, Core Operating Limits Report, Cycle 19
| ML14108A311 | |
| Person / Time | |
|---|---|
| Site: | Davis Besse  |
| Issue date: | 04/18/2014 |
| From: | Lieb R FirstEnergy Nuclear Operating Co |
| To: | Document Control Desk, Office of Nuclear Reactor Regulation |
| References | |
| L-14-107 | |
| Download: ML14108A311 (25) | |
Text
FENOC- 55Al NorthStateRoute2 Oak Harbor,Ohio 43449 FirstEnergy NuctearliratingCompany nqnd A Lbb 419-321-7676 Vico Prcsident,^lrclear , Fax:41gn1-7ffi2 April18,2014 L-14-107 ATTN:Document Control Desk U.S.Nuclear Regulatory Commission Washington, DC20555-0001
SUBJECT:
Davis-Besse NuclearPowerStation DocketNo.50-346,LicenseNo.NPF-3 CoreOperatinq LimitsReport,Cvcle19 Pursuant to therequirements of Davis-Besse NuclearPowerStation(DBNPS)
Technical Specification 5.6,3,'CORE OPERATING LIMITSREPORT (COLR),"
FirstEnergy Nuclear Operating Company hereby submits theDBNPSCycle19COLR, Revision 0.
Thereareno regulatory commitments in thissubmittal.lf thereareany contained questions or if additional information pleasecontact is required, Mr.Thomas A. Lentz, Manager - FleetLicensing, at (330)315-6810.
Sincerely, Ua#/
Raymbnd A. Lieb
Enclosure:
FirstEnergy NuclearOperating Company, Davis-Besse Unit1, Cycle19, CoreOperating LimitsReport,Revision0 cc: NRCRegionlllAdministrator NRCResidentInspector NRCProjectManager UtilityRadiologicalSafety Board
Enclosure L-14-107 FirstEnergy Nuclear Operating Company, Davis-Besse Unit 1, Cycle 19, Core Operating Limits Report, Revision 0 (Twenty-Three Pages Follow)
Davis-Besse Cycle 19 COLR Page 2 of 23 Revision 0 1.0 Core Operating Limits This CORE OPERATING LIMITS REPORT for DB-1 Cycle 19 has been prepared in accordance with the requirements of Technical Specification 5.6.3. The Core Operating Limits have been developed using the methodology provided in Reference 2.0 (1). The licensed length of Cycle 19 is 700 EFPDs.
The following cycle-specific core Operating Limits, Protective Limit and Flux - Flux -Flow Reactor Protection System Allowable Values are included in this report:
- 1. SL 2.1.1.1 Reactor Core Safety Limits
- 2. LCO 3.1.1 SHUTDOWN MARGIN (SDM)
- 3. LCO 3.1.3 Moderator Temperature Coefficient (MTC)
- 4. LCO 3.1.7 Position Indicator Channels
- 5. LCO 3.1.8 PHYSICS TESTS Exceptions - MODE 1
- 6. LCO 3.1.9 PHYSICS TESTS Exceptions - MODE 2
- 7. LCO 3.2.1 Regulating Rod Insertion Limits
- 8. LCO 3.2.2 AXIAL POWER SHAPING ROD (APSR) Insertion Limits
- 9. LCO 3.2.3 AXIAL POWER IMBALANCE Operating Limits
- 10. LCO 3.2.4 QUADRANT POWER TILT (QPT)
- 11. LCO 3.2.5 Power Peaking Factors
- 12. LCO 3.3.1 Reactor Protection Systems (RPS) Instrumentation Function 8: (Flux - Flux - Flow) Allowable Values
- 14. TRM 8.1.3 Rod Program 2.0 References
- 1) BAW-10179P-A, Rev. 8, Safety Criteria and Methodology for Acceptable Cycle Reload Analyses, May 2010.
Davis-Besse Cycle 19 COLR Page 3 of 23 Revision 0 Table of Contents Page Reactor Core Safety Limits Figure 1 AXIAL POWER IMBALANCE Protective Limits 2817 MWt, Davis-Besse 1, Cycle 19 5 SHUTDOWN MARGIN (SDM)
Table 1 Shutdown Margin Requirements 6 Moderator Temperature Coefficient (MTC)
Table 2 Moderator Temperature Coefficient Limit 7 Position Indicator Channels Table 3 Absolute Position Indicator (API) / Relative Position Indicator (RPI)
Agreement Limit 8 Regulating Rod Insertion Limits Figure 2a Regulating Group Position Operating Limits 0 to 300 +/- 10 EFPD, Four RC Pumps -- 2817 MWt RTP Davis-Besse 1, Cycle 19 9 Figure 2b Regulating Group Position Operating Limits After 300 +/- 10 EFPD, Four RC Pumps -- 2817 MWt RTP Davis-Besse 1, Cycle 19 10 Figure 2c Regulating Group Position Operating Limits 0 to 300 +/- 10 EFPD, Three RC Pumps -- 2817 MWt RTP Davis-Besse 1, Cycle 19 11 Figure 2d Regulating Group Position Operating Limits After 300 +/- 10 EFPD, Three RC Pumps -- 2817 MWt RTP Davis-Besse 1, Cycle 19 12 AXIAL POWER SHAPING ROD (APSR) Insertion Limits Figure 3 APSR Position Operating Limits 13 AXIAL POWER IMBALANCE Operating Limits Figure 4a AXIAL POWER IMBALANCE Operating Limits 0 EFPD to EOC, Four RC Pumps -- 2817 MWt RTP Davis-Besse 1, Cycle 19 14 Figure 4b AXIAL POWER IMBALANCE Operating Limits 0 EFPD to EOC, Three RC Pumps -- 2817 MWt RTP Davis-Besse 1, Cycle 19 15 QUADRANT POWER TILT (QPT)
Table 4 QUADRANT POWER TILT Limits 16
Davis-Besse Cycle 19 COLR Page 4 of 23 Revision 0 Table of Contents Page Power Peaking Factors Table 5 Power Peaking Factors - FQ 17 Table 6 Power Peaking Factors - FNH 19 Figure 5 Maximum Allowable Radial Peak for FNH 19 Table 7 Maximum Allowable Radial Peak for FNH 20 Reactor Protection System (RPS) Instrumentation Figure 6 Flux-Flux-Flow (or Power/Imbalance/Flow) Allowable Values 21 Boron Concentration Table 8 Refueling Boron Concentration Limit 22 Rod Program Figure 7 Control Rod Core Locations and Group Assignments 23
Davis-Besse Cycle 19 COLR Page 5 of 23 Revision 0 Figure 1 AXIAL POWER IMBALANCE Protective Limits 2817 MWt RTP, Davis-Besse 1, Cycle 19 This Figure is referred to by Technical Specification 2.1.1.1 120
(-45.62, 110.2) (39.53, 110.2) 110 4 PUMP LIMIT
(-49.50, 100.0) 100 (49.50, 100.0)
(-45.62, 90.9) (39.53, 90.9) 90 3 PUMP LIMIT
(-49.50, 80.7) 80 (49.50, 80.7) 70 UNACCEPTABLE UNACCEPTABLE Power (Percent of RATED THERMAL POWER)
OPERATION OPERATION 60 50 40 ACCEPTABLE OPERATION FOR SPECIFIED 30 RC PUMP COMBINATION 20 10 0
-80 -70 -60 -50 -40 -30 -20 -10 0 10 20 30 40 50 60 70 80 AXIAL POWER IMBALANCE, %
Required Measured Reactor Coolant Flow to Ensure Pumps Operating Flow, gpm Compliance, gpm 4 380,000 389,500 3 283,860 290,957
Davis-Besse Cycle 19 COLR Page 6 of 23 Revision 0 Table 1 Shutdown Margin Requirements Verify SHUTDOWN MARGIN per the table below.
REQUIRED SHUTDOWN TECHNICAL SPECIFICATIONS APPLICABILITY MARGIN REFERENCE MODE 1* 1 %k/k 3.1.4, 3.1.5 MODE 2* 1 %k/k 3.1.4, 3.1.5, 3.3.9 MODE 3 1 %k/k 3.1.1, 3.3.9 MODE 4 1 %k/k 3.1.1, 3.3.9 MODE 5 1 %k/k 3.1.1, 3.3.9 MODE 1 PHYSICS TESTS 1 %k/k 3.1.8 Exceptions**
MODE 2 PHYSICS TESTS 1 %k/k 3.1.9 Exceptions
- The required Shutdown Margin capability of 1%k/k in MODE 1 and MODE 2 is preserved by the Regulating Rod Insertion Limits specified in Figures 2a through 2d as required by Technical Specification 3.2.1.
- Entry into Mode 1 Physics Tests Exceptions is not supported by existing analyses. For example, Regulating Rod Shutdown Margin Insertion Limits assumptions may not be met and as such requires actual shutdown margin to be 1 %k/k via alternate verification or calculation.
Davis-Besse Cycle 19 COLR Page 7 of 23 Revision 0 Table 2 Moderator Temperature Coefficient Limit These limits are referred to by Technical Specifications 3.1.3
- 1. Lower Limit:
MTC at HFP -3.54x10-4 k/k/°F
- 2. The following Upper Limits may not be exceeded without prior NRC approval:
MTC <0.9 x 10-4 k/k/°F when Thermal Power <95% RTP MTC <0.0 x 10-4 k/k/°F when Thermal Power 95% RTP
- 3. The following Upper Limits may not be exceeded for operation in Modes 1 and 2:
Davis-Besse Cycle 19 COLR Page 8 of 23 Revision 0 Table 3 Absolute Position Indicator (API) / Relative Position Indicator (RPI)
Agreement Limit This limit is referred to by Technical Specifications 3.1.7 The absolute position indicator channels and the relative position indicator channels agree within 3.46%.
Davis-Besse Cycle 19 COLR Page 9 of 23 Revision 0 Figure 2a Regulating Group Position Operating Limits 0 to 300 +10 EFPD, Four RC Pumps--2817 MWt RTP Davis-Besse 1, Cycle 19 This Figure is referred to by Technical Specifications 3.2.1 110 100 90 Unacceptable Power (Percent of RATED THERMAL POWER) 80 Operation Operation 70 Shutdown Restricted Margin 60 Limit 50 40 30 Acceptable Operation 20 10 0
0 25 50 75 100 125 150 175 200 225 250 275 300 Rod Index, %Withdrawn 0 75 100 Group 5 0 25 75 100 Group 6 0 25 100 Group 7 Note 1: A Rod Group overlap of 25 +/- 5% between sequential withdrawn groups 5 and 6, and 6 and 7, shall be maintained.
Note 2: Instrument error is accounted for in these Operating Limits.
Note 3: Maximum plotted power level is 100.37 %RTP.
Davis-Besse Cycle 19 COLR Page 10 of 23 Revision 0 Figure 2b Regulating Group Position Operating Limits After 300 +10 EFPD, Four RC Pumps--2817 MWt RTP Davis-Besse 1, Cycle 19 This Figure is referred to by Technical Specifications 3.2.1 110 100 90 Power (Percent of RATED THERMAL POWER)
Operation 80 Restricted Unacceptable Operation 70 60 50 Shutdown Margin Limit 40 30 Acceptable Operation 20 10 0
0 25 50 75 100 125 150 175 200 225 250 275 300 Rod Index, %Withdrawn 0 75 100 Group 5 0 25 75 100 Group 6 0 25 100 Group 7 Note 1: A Rod Group overlap of 25 +5% between sequential withdrawn groups 5 and 6, and 6 and 7, shall be maintained.
Note 2: Instrument error is accounted for in these Operating Limits.
Note 3: Maximum plotted power level is 100.37 %RTP.
Davis-Besse Cycle 19 COLR Page 11 of 23 Revision 0 Figure 2c Regulating Group Position Operating Limits 0 to 300 +10 EFPD, Three RC Pumps--2817 MWt RTP Davis-Besse 1, Cycle 19 This Figure is referred to by Technical Specifications 3.2.1 110 100 90 Power (Percent of RATED THERMAL POWER) 80 Unacceptable 70 Operation 60 Shutdown Operation Margin Restricted 50 Limit 40 30 20 Acceptable Operation 10 0
0 25 50 75 100 125 150 175 200 225 250 275 300 Rod Index, %Withdrawn 0 75 100 Group 5 0 25 75 100 Group 6 0 25 100 Group 7 Note 1: A Rod Group overlap of 25 +/- 5% between sequential withdrawn groups 5 and 6, and 6 and 7, shall be maintained.
Note 2: Instrument error is accounted for in these Operating Limits.
Note 3: Maximum plotted power level is 75.37 %RTP.
Davis-Besse Cycle 19 COLR Page 12 of 23 Revision 0 Figure 2d Regulating Group Position Operating Limits After 300 +10 EFPD, Three RC Pumps--2817 MWt RTP Davis-Besse 1, Cycle 19 This Figure is referred to by Technical Specifications 3.2.1 110 100 90 Power (Percent of RATED THERMAL POWER) 80 70 Operation Unacceptable Restricted 60 Operation 50 Shutdown Margin 40 Limit 30 20 Acceptable Operation 10 0
0 25 50 75 100 125 150 175 200 225 250 275 300 Rod Index, %Withdrawn 0 75 100 Group 5 0 25 75 100 Group 6 0 25 100 Group 7 Note 1: A Rod Group overlap of 25 +5% between sequential withdrawn groups 5 and 6, and 6 and 7, shall be maintained.
Note 2: Instrument error is accounted for in these Operating Limits.
Note 3: Maximum plotted power level is 75.37 %RTP.
Davis-Besse Cycle 19 COLR Page 13 of 23 Revision 0 Figure 3 APSR Position Operating Limits This Figure is referred to by Technical Specifications 3.2.2 Before APSR Pull: 0 EFPD to 600 +/- 10 EFPD, Three or Four RC pumps operation*
Lower Limit: 0 %WD Upper Limit: 100 %WD After APSR Pull: 600 +/- 10 EFPD to End-of-Cycle Three or Four RC pumps operation*
Insertion Prohibited (maintain 99%WD) **
- Power restricted to 75.37% for 3-pump operation.
- Reinsertion is allowed only during the end of cycle shutdown when the reactor power is equal to, or less than, 30%RTP.
Davis-Besse Cycle 19 COLR Page 14 of 23 Revision 0 Figure 4a AXIAL POWER IMBALANCE Operating Limits 0 EFPD to EOC, Four RC Pumps--2817 MWt RTP Davis-Besse 1, Cycle 19 This Figure is referred to by Technical Specification 3.2.3 110 100 Restricted Restricted Region Region 90 80 Power (Percent of RATED THERMAL POWER) 70 60 50 40 Permissible Operating Region 30 20 10 0
-60 -50 -40 -30 -20 -10 0 10 20 30 40 50 60 AXIAL POWER IMBALANCE % LEGEND FULL INCORE Note 1: Instrument error is accounted for in these Operating Limits.
Note 2: The Excore Imbalance Operating Limits are available for use when the Full Incore EXCORE system is non-functional.
Note 3: Maximum plotted power level is 100.37 %RTP.
Davis-Besse Cycle 19 COLR Page 15 of 23 Revision 0 Figure 4b AXIAL POWER IMBALANCE Operating Limits 0 EFPD to EOC, Three RC Pumps--2817 MWt RTP Davis-Besse 1, Cycle 19 This Figure is referred to by Technical Specification 3.2.3 110 100 90 80 Restricted Restricted Region Region 70 Power (Percent of RATED THERMAL POWER) 60 50 40 Permissible Operating Region 30 20 10 0
-60 -50 -40 -30 -20 -10 0 10 20 30 40 50 60 AXIAL POWER IMBALANCE % LEGEND FULL INCORE Note 1: Instrument error is accounted for in these Operating Limits. EXCORE Note 2: The Excore Imbalance Operating Limits are available for use when the Full Incore system is non-functional.
Note 3: Maximum plotted power level is 75.37 %RTP.
Davis-Besse Cycle 19 COLR Page 16 of 23 Revision 0 Table 4 QUADRANT POWER TILT Limits This Table is referred to by Technical Specifications 3.2.4 From 0 EFPD to EOC Steady-state Limit Steady-state Limit QUADRANT for THERMAL for THERMAL POWER TILT as POWER 60% POWER >60% Transient Limit Maximum Limit measured by: (%) (%) (%) (%)
Symmetric Incore 7.90 3.90 10.03 20.00 Detector System
Davis-Besse Cycle 19 COLR Page 17 of 23 Revision 0 Table 5 Power Peaking Factors - FQ This Table is referred to by Technical Specifications 3.2.5 The measured FQ shall be increased by 1.4% to account for manufacturing tolerances and further increased by 7.5% to account for measurement uncertainty before comparing to the limits.
Heat Flux Hot Channel Factor FQ FQ shall be limited by the following relationships:
FQ LHRallow (Bu) / [LHRavg
- P] (for P 1.0)
LHRallow (Bu) = See the following tables LHRavg = 6.4209 kW/ft at 2817 MWt for Batches 18, 19, 20 and 21 Mark-B-HTP fuel P = ratio of THERMAL POWER / RATED THERMAL POWER Bu = fuel burnup (MWd/mtU)
UO2 Fuel (Mark-B-HTP) - All Batches LHRALLOW kW/ft(a) 0 34,000 62,000 Core Elevation (ft) MWd/mtU MWd/mtU MWd/mtU 0 17.6 17.2 13.1 2.506 17.6 17.2 13.1 4.264 17.5 17.1 13.1 6.021 16.8 16.8 13.1 7.779 17.0 16.7 13.1 9.536 16.2 16.3 13.1 12.000 15.4 15.5 12.4 (a)
Linear interpolation for allowable LHR between specified burnup points is valid for these tables.
Davis-Besse Cycle 19 COLR Page 18 of 23 Revision 0 Table 5 (continued) 4 wt% Gad Fuel (Mark-B-HTP) - All Batches except 21B LHRALLOW kW/ft(a) 0 34,000 62,000 Core Elevation (ft) MWd/mtU MWd/mtU MWd/mtU 0 15.8 15.7 11.8 2.506 15.8 15.7 11.8 4.264 15.7 15.5 11.8 6.021 15.1 15.2 11.8 7.779 15.3 15.2 11.8 9.536 14.6 14.8 11.8 12.000 13.8 14.1 11.2 6 wt% Gad Fuel (Mark-B-HTP) - Batch 20C and 21B LHRALLOW kW/ft(a) 0 34,000 62,000 Core Elevation (ft) MWd/mtU MWd/mtU MWd/mtU 0 15.3 15.4 11.4 2.506 15.3 15.4 11.4 4.264 15.2 15.4 11.4 6.021 14.5 15.1 11.4 7.779 14.8 15.0 11.4 9.536 14.1 14.7 11.4 12.000 13.3 14.0 10.8 8 wt% Gad Fuel (Mark-B-HTP) - Batches 18A5, 19C2, 20A, 21A, 21B and 21E LHRALLOW kW/ft(a) 0 34,000 62,000 Core Elevation (ft) MWd/mtU MWd/mtU MWd/mtU 0 14.9 14.9 11.0 2.506 14.9 14.9 11.0 4.264 14.8 14.9 11.0 6.021 14.2 14.5 11.0 7.779 14.4 14.5 11.0 9.536 13.7 14.2 11.0 12.000 13.0 13.5 10.4 (a)
Linear interpolation for allowable LHR between specified burnup points is valid for these tables.
Davis-Besse Cycle 19 COLR Page 19 of 23 Revision 0 Table 6 Power Peaking Factors - FNH This Table is referred to by Technical Specifications 3.2.5 Enthalpy Rise Hot Channel Factors - FNH FNH MARP [1 + (1/RH) (1 - P/Pm)] (see note below)
MARP = Maximum Allowable Radial Peak, see MARP Figures and data Tables P = THERMAL POWER / RATED THERMAL POWER and P 1.0 Pm = 1.0 for 4-RCP operation Pm = 0.75 for 3-RCP operation 1/RH = 0.3 Note: The measured FNH shall be increased by 5.0% to account for measurement uncertainty prior to comparing to the limits.
Figure 5 Maximum Allowable Radial Peak for FNH *
- Linear interpolation is acceptable.
Davis-Besse Cycle 19 COLR Page 20 of 23 Revision 0 Table 7 Maximum Allowable Radial Peak for FNH Axial Axial Axial Height Axial Height Peak x/L (inches) MARP Limit Peak x/L (inches) MARP Limit 0.0 0.00 1.88299 0.0 0.00 2.09189 0.1 14.30 1.88398 0.1 14.30 2.03919 0.14 20.02 1.88428 0.14 20.02 2.01827 0.2 28.60 1.88461 0.2 28.60 1.98801 0.4 57.20 1.88490 0.4 57.20 1.86840 1.1 0.5 71.50 1.88439 1.6 0.5 71.50 1.81257 0.6 85.80 1.88451 0.6 85.80 1.73794 0.8 114.40 1.88421 0.8 114.40 1.59754 0.88 125.84 1.85239 0.88 125.84 1.54331 0.9 128.70 1.83969 0.9 128.70 1.55084 1.0 143.00 1.73842 1.0 143.00 1.46874 0.0 0.00 1.96511 0.0 0.00 1.99604 0.1 14.30 1.96705 0.1 14.30 1.95702 0.14 20.02 1.96804 0.14 20.02 1.93661 0.2 28.60 1.96825 0.2 28.60 1.90615 0.4 57.20 1.96936 0.4 57.20 1.79933 1.2 0.5 71.50 1.96984 1.7 0.5 71.50 1.74468 0.6 85.80 1.96919 0.6 85.80 1.67736 0.8 114.40 1.84278 0.8 114.40 1.54415 0.88 125.84 1.78287 0.88 125.84 1.49299 0.9 128.70 1.78220 0.9 128.70 1.50138 1.0 143.00 1.67994 1.0 143.00 1.42245 0.0 0.00 2.05580 0.0 0.00 1.90606 0.1 14.30 2.05912 0.1 14.30 1.87049 0.14 20.02 2.06036 0.14 20.02 1.85710 0.2 28.60 2.06155 0.2 28.60 1.82954 0.4 57.20 2.06343 0.4 57.20 1.73365 1.3 0.5 71.50 2.01583 1.8 0.5 71.50 1.67902 0.6 85.80 1.93900 0.6 85.80 1.62023 0.8 114.40 1.77864 0.8 114.40 1.49550 0.88 125.84 1.71670 0.88 125.84 1.44607 0.9 128.70 1.72105 0.9 128.70 1.45590 1.0 143.00 1.61890 1.0 143.00 1.37861 0.0 0.00 2.15314 0.0 0.00 1.82131 0.1 14.30 2.15758 0.1 14.30 1.78903 0.14 20.02 2.15910 0.14 20.02 1.78024 0.2 28.60 2.14648 0.2 28.60 1.75713 0.4 57.20 2.01712 0.4 57.20 1.67040 1.4 0.5 71.50 1.95015 1.9 0.5 71.50 1.61847 0.6 85.80 1.87083 0.6 85.80 1.56653 0.8 114.40 1.71630 0.8 114.40 1.44958 0.88 125.84 1.65545 0.88 125.84 1.40281 0.9 128.70 1.65903 0.9 128.70 1.41322 1.0 143.00 1.57207 1.0 143.00 1.33783 0.0 0.00 2.17667 0.1 14.30 2.12413 0.14 20.02 2.10403 0.2 28.60 2.07451 0.4 57.20 1.94104 1.5 0.5 71.50 1.88067 0.6 85.80 1.80330 0.8 114.40 1.65555 0.88 125.84 1.59706 0.9 128.70 1.60415 1.0 143.00 1.51859
Davis-Besse Cycle 19 COLR Page 21 of 23 Revision 0 Figure 6 Flux-Flux-Flow (or Power/Imbalance/Flow)
Allowable Values This Figure is referred to by Technical Specification 3.3.1 120 4 PUMP LIMIT 110
(-17.0, 108.0) (17.0, 108.0) 100
(-30.6, 94.4) (30.6, 94.4) 90 80 3 PUMP EXAMPLE 70 Power (Percent of RATED THERMAL POWER) 60 50 UNACCEPTABLE UNACCEPTABLE OPERATION OPERATION 40 30 ACCEPTABLE OPERATION FOR SPECIFIED RC 20 PUMP 10 0
-60 -50 -40 -30 -20 -10 0 10 20 30 40 50 60 AXIAL POWER IMBALANCE, %
The 3 pump example curve shows allowable values for an approximately 25% flow reduction for three pump operation (283,860 gpm). The actual setpoint will be calculated by the Reactor Protection System and will be directly proportional to the actual RC flow with three pumps.
These limits are based on Cycle 9 and are conservative relative to the actual Cycle 19 limits.
Davis-Besse Cycle 19 COLR Page 22 of 23 Revision 0 Table 8 Refueling Boron Concentration Limit This limit is referred to by Technical Specifications 3.9.1 The minimum required boron concentration for Mode 6 shall be sufficient to ensure a Keff of 0.95 or less, plus an additional 1% k/k conservatism allowance for uncertainties.
Davis-Besse Cycle 19 COLR Page 23 of 23 Revision 0 Figure 7 Control Rod Core Locations and Group Assignments This Figure is referred to by Technical Requirements N Manual 8.1.3 (X) 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 A
4 6 4 B 2 5 5 2 C 7 8 7 8 7 D 2 5 5 2 E 4 8 6 3 6 8 4 F 5 1 1 5 G (W) 6 7 3 4 3 7 6 H (Y) 5 1 1 5 K 4 8 6 3 6 8 4 L 2 5 5 2 M 7 8 7 8 7 N 2 5 5 2 O 4 6 4 P R
X Group Number (Z)
Group No of Rods Function Group No of Rods Function 1 4 Safety 5 12 Control 2 8 Safety 6 8 Control 3 4 Safety 7 8 Control 4 9 Safety 8 8 APSRs Total 61