L-14-107, Core Operating Limits Report, Cycle 19

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Core Operating Limits Report, Cycle 19
ML14108A311
Person / Time
Site: Davis Besse Cleveland Electric icon.png
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)
v • d • e


Text

FENOC-FirstEnergy Nuctearlirating Company 55Al North State Route 2 Oak Harbor, Ohio 43449 419-321-7676 nqnd A Lbb Fax: 41gn1-7ffi2 Vi co Prcsi dent, ^lrclear April 18, 2014 L-14-107 ATTN: Document Control Desk U.S. Nuclear Regulatory Commission Washington, DC 20555-0001

SUBJECT:

Davis-Besse Nuclear Power Station Docket No. 50-346, License No. NPF-3 Core Operatinq Limits Report, Cvcle 19 Pursuant to the requirements of Davis-Besse Nuclear Power Station (DBNPS)

Technical Specification 5.6,3,'CORE OPERATING LIMITS REPORT (COLR),"

FirstEnergy Nuclear Operating Company hereby submits the DBNPS Cycle 19 COLR, Revision 0.

There are no regulatory commitments contained in this submittal. lf there are any questions or if additional information is required, please contact Mr. Thomas A. Lentz, Manager

- Fleet Licensing, at (330) 315-6810.

Sincerely, Ua#/

Raymbnd A. Lieb

Enclosure:

FirstEnergy Nuclear Operating

Company, Davis-Besse Unit 1, Cycle 19, Core Operating Limits Report, Revision 0

cc: NRC Region lllAdministrator NRC Resident Inspector NRC Project Manager Utility Radiological Safety 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
13. LCO 3.9.1 Boron Concentration
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 - FN H

19 Figure 5 Maximum Allowable Radial Peak for FN H

19 Table 7 Maximum Allowable Radial Peak for FN H

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 0

10 20 30 40 50 60 70 80 90 100 110 120

-80

-70

-60

-50

-40

-30

-20

-10 0

10 20 30 40 50 60 70 80 AXIAL POWER IMBALANCE, %

Power (Percent of RATED THERMAL POWER)

This Figure is referred to by Technical Specification 2.1.1.1 ACCEPTABLE OPERATION FOR SPECIFIED RC PUMP COMBINATION AXIAL POWER IMBALANCE Protective Limits 2817 MWt RTP, Davis-Besse 1, Cycle 19 Figure 1 UNACCEPTABLE OPERATION UNACCEPTABLE OPERATION 3 PUMP LIMIT 4 PUMP LIMIT

(-45.62, 110.2)

(-49.50, 100.0)

(-49.50, 80.7)

(-45.62, 90.9)

(39.53, 110.2)

(49.50, 100.0)

(49.50, 80.7)

(39.53, 90.9)

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.

APPLICABILITY REQUIRED SHUTDOWN MARGIN TECHNICAL SPECIFICATIONS 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 Exceptions**

1 %k/k 3.1.8 MODE 2 PHYSICS TESTS Exceptions 1 %k/k 3.1.9

    • 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 0

10 20 30 40 50 60 70 80 90 100 110 0

25 50 75 100 125 150 175 200 225 250 275 300 Rod Index, %Withdrawn Power (Percent of RATED THERMAL POWER)

This Figure is referred to by Technical Specifications 3.2.1 Shutdown Margin Limit Acceptable Operation Unacceptable Operation Operation Restricted Regulating Group Position Operating Limits 0 to 300 +10 EFPD, Four RC Pumps--2817 MWt RTP Davis-Besse 1, Cycle 19 Figure 2a 0

75 100 0

25 75 100 Group 5 Group 6 25 100 Group 7 0

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 0

10 20 30 40 50 60 70 80 90 100 110 0

25 50 75 100 125 150 175 200 225 250 275 300 Rod Index, %Withdrawn Power (Percent of RATED THERMAL POWER)

This Figure is referred to by Technical Specifications 3.2.1 Shutdown Margin Limit Acceptable Operation Unacceptable Operation Regulating Group Position Operating Limits After 300 +10 EFPD, Four RC Pumps--2817 MWt RTP Davis-Besse 1, Cycle 19 Figure 2b 0

75 100 0

25 75 100 Group 5 Group 6 25 100 Group 7 0

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.

Operation Restricted

Davis-Besse Cycle 19 COLR Page 11 of 23 Revision 0 0

10 20 30 40 50 60 70 80 90 100 110 0

25 50 75 100 125 150 175 200 225 250 275 300 Rod Index, %Withdrawn Power (Percent of RATED THERMAL POWER)

This Figure is referred to by Technical Specifications 3.2.1 Shutdown Margin Limit Acceptable Operation Unacceptable Operation Operation Restricted Regulating Group Position Operating Limits 0 to 300 +10 EFPD, Three RC Pumps--2817 MWt RTP Davis-Besse 1, Cycle 19 Figure 2c 0

75 100 0

25 75 100 Group 5 Group 6 25 100 Group 7 0

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 0

10 20 30 40 50 60 70 80 90 100 110 0

25 50 75 100 125 150 175 200 225 250 275 300 Rod Index, %Withdrawn Power (Percent of RATED THERMAL POWER)

This Figure is referred to by Technical Specifications 3.2.1 Shutdown Margin Limit Acceptable Operation Unacceptable Operation Regulating Group Position Operating Limits After 300 +10 EFPD, Three RC Pumps--2817 MWt RTP Davis-Besse 1, Cycle 19 Figure 2d 0

75 100 0

25 75 100 Group 5 Group 6 25 100 Group 7 0

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.

Operation Restricted

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 0

10 20 30 40 50 60 70 80 90 100 110

-60

-50

-40

-30

-20

-10 0

10 20 30 40 50 60 AXIAL POWER IMBALANCE %

Power (Percent of RATED THERMAL POWER)

This Figure is referred to by Technical Specification 3.2.3 Permissible Operating Region AXIAL POWER IMBALANCE Operating Limits 0 EFPD to EOC, Four RC Pumps--2817 MWt RTP Davis-Besse 1, Cycle 19 Figure 4a 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 system is non-functional.

Note 3: Maximum plotted power level is 100.37 %RTP.

Restricted Region Restricted Region LEGEND FULL INCORE EXCORE

Davis-Besse Cycle 19 COLR Page 15 of 23 Revision 0 0

10 20 30 40 50 60 70 80 90 100 110

-60

-50

-40

-30

-20

-10 0

10 20 30 40 50 60 AXIAL POWER IMBALANCE %

Power (Percent of RATED THERMAL POWER)

This Figure is referred to by Technical Specification 3.2.3 Permissible Operating Region AXIAL POWER IMBALANCE Operating Limits 0 EFPD to EOC, Three RC Pumps--2817 MWt RTP Davis-Besse 1, Cycle 19 Figure 4b Restricted Region Restricted Region 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 system is non-functional.

Note 3: Maximum plotted power level is 75.37 %RTP.

LEGEND FULL INCORE EXCORE

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 QUADRANT POWER TILT as measured by:

Steady-state Limit for THERMAL POWER 60%

(%)

Steady-state Limit for THERMAL POWER >60%

(%)

Transient Limit

(%)

Maximum Limit

(%)

Symmetric Incore Detector System 7.90 3.90 10.03 20.00

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 - FN H

This Table is referred to by Technical Specifications 3.2.5 Enthalpy Rise Hot Channel Factors - FN H

FN H 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 FN H shall be increased by 5.0% to account for measurement uncertainty prior to comparing to the limits.

Figure 5 Maximum Allowable Radial Peak for FN H *

  • Linear interpolation is acceptable.

Davis-Besse Cycle 19 COLR Page 20 of 23 Revision 0 Table 7 Maximum Allowable Radial Peak for FN H

Axial Peak x/L Axial Height (inches)

MARP Limit Axial Peak x/L Axial Height (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 0.5 71.50 1.88439 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 1.1 1.0 143.00 1.73842 1.6 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 0.5 71.50 1.96984 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 1.2 1.0 143.00 1.67994 1.7 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 0.5 71.50 2.01583 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 1.3 1.0 143.00 1.61890 1.8 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 0.5 71.50 1.95015 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 1.4 1.0 143.00 1.57207 1.9 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 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 1.5 1.0 143.00 1.51859

Davis-Besse Cycle 19 COLR Page 21 of 23 Revision 0 0

10 20 30 40 50 60 70 80 90 100 110 120

-60

-50

-40

-30

-20

-10 0

10 20 30 40 50 60 AXIAL POWER IMBALANCE, %

Power (Percent of RATED THERMAL POWER)

This Figure is referred to by Technical Specification 3.3.1 ACCEPTABLE OPERATION FOR SPECIFIED RC PUMP Flux-Flux-Flow (or Power/Imbalance/Flow)

Allowable Values UNACCEPTABLE OPERATION 3 PUMP EXAMPLE 4 PUMP LIMIT UNACCEPTABLE OPERATION 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.

(-17.0, 108.0)

(-30.6, 94.4)

(30.6, 94.4)

(17.0, 108.0)

Figure 6

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 (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)

This Figure is referred to by Technical Requirements Manual 8.1.3 N

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

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