L-19-162, Submittal of Core Operating Limits Report, Cycle 21, Revision 1

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Submittal of Core Operating Limits Report, Cycle 21, Revision 1
ML19171A298
Person / Time
Site: Davis Besse Cleveland Electric icon.png
Issue date: 06/20/2019
From: Bezilla M
FirstEnergy Nuclear Operating Co
To:
Document Control Desk, Office of Nuclear Reactor Regulation
References
L-19-162
Download: ML19171A298 (29)
v • d • e


Text

FENOC 5501 North State Route 2 Oak Harbor, Ohio 43449 Mark B. Bezilla 419-321-7676 Vice President - Nuclear Fax: 419-321-7582 June 20, 2019 L-19-162 A TIN: Document Control Desk U.S. Nuclear Regulatory Commission Washington, DC 20555-0001

SUBJECT:

Davis-Besse Nuclear Power Station, Unit No.1 Docket No. 50-346, License No. NPF-3 Core Operating Limits Report, Cycle 21, Revision 1 Enclosed is Revision 1 to the Davis-Besse Nuclear Power Station, Unit No. 1 (DBNPS)

Cycle 21 Core Operating Limits Report. This revision incorporates notes related to the updated loss-of-coolant accident analysis and revised limits for Quadrant Power Tilt and Moderator Temperature Coefficient to provide additional operating margin. Submittal of this revision is in accordance with DBNPS Technical Specification 5.6.3, "CORE OPERATING LIMITS REPORT (COLR)."

There are no regulatory commitments contained in this letter. If there are any questions or if additional information is required, please contact Mr. Phil H. Lashley, Acting Manager, Nuclear Licensing and Regulatory Affairs, at (330) 315-6808.

s$i;_ 6~- ~

Mark B. Bezilla ~

Enclosure:

Cycle 21, Core Operating Limits Report, Revision 1 cc: NRC Region 111 Administrator NRC Resident Inspector NRR Project Manager Utility Radiological Safety Board

Enclosure L-19-162 Cycle 21, Core Operating Limits Report, Revision 1 (27 pages follow)

Davis-Besse Cycle 21 COLR Page 1 of 27 Revision 1 FIRSTENERGY NUCLEAR OPERATING COMPANY DAVIS-BESSE UNIT 1 CYCLE 21 CORE OPERATING LIMITS REPORT Prepared by __~

___..,£) __l3_l-lf!1:

_____9_12_41_1_8 D. B. Kelley Reviewed by (/?13,~ J. D. Brown JC/4/i 8 Approved by ~~ R. . and

\oj IA [--w\i:,

LIST OF EFFECTIVE PAGES Page 1 through 27 Rev. 1

Davis-Besse Cycle 21 COLR Page 2 of 27 Revision 1 1.0 Core Operating Limits This CORE OPERATING LIMITS REPORT for DB-1 Cycle 21 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 21 is 690 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. 9, Safety Criteria and Methodology for Acceptable Cycle Reload Analyses, November 2017.

Davis-Besse Cycle 21 COLR Page 3 of 27 Revision 1 Table of Contents Page Reactor Core Safety Limits Figure 1 AXIAL POWER IMBALANCE Protective Limits Davis-Besse 1, Cycle 21 5 SHUTDOWN MARGIN (SDM)

Table 1 Shutdown Margin Requirements for Davis-Besse, Cycle 21 6 Moderator Temperature Coefficient (MTC)

Table 2 Moderator Temperature Coefficient Limit for Davis-Besse, Cycle 21 7 Position Indicator Channels Table 3 Absolute Position Indicator (API) / Relative Position Indicator (RPI)

Agreement Limit for Davis-Besse, Cycle 21 8 Regulating Rod Insertion Limits Figure 2a Regulating Group Position Operating Limits 0 to 300 +/- 10 EFPD, Four RC Pumps Davis-Besse 1, Cycle 21 9 Figure 2b Regulating Group Position Operating Limits After 300 +/- 10 EFPD, Four RC Pumps Davis-Besse 1, Cycle 21 10 Figure 2c Regulating Group Position Operating Limits 0 to 300 +/- 10 EFPD, Three RC Pumps Davis-Besse 1, Cycle 21 11 Figure 2d Regulating Group Position Operating Limits After 300 +/- 10 EFPD, Three RC Pumps Davis-Besse 1, Cycle 21 12 AXIAL POWER SHAPING ROD (APSR) Insertion Limits Figure 3 APSR Position Operating Limits for Davis-Besse, Cycle 21 13 AXIAL POWER IMBALANCE Operating Limits Figure 4a AXIAL POWER IMBALANCE Operating Limits 0 to 200 +/- 10 EFPD, Four RC Pumps Davis-Besse 1, Cycle 21 14 Figure 4b AXIAL POWER IMBALANCE Operating Limits 200 +/- 10 EFPD to 450 +/- 10 EFPD, Four RC Pumps Davis-Besse 1, Cycle 21 15 Figure 4c AXIAL POWER IMBALANCE Operating Limits 450 +/- 10 EFPD to EOC, Four RC Pumps Davis-Besse 1, Cycle 21 16 Figure 4d AXIAL POWER IMBALANCE Operating Limits 0 to 200 +/- 10 EFPD, Three RC Pumps Davis-Besse 1, Cycle 21 17

Davis-Besse Cycle 21 COLR Page 4 of 27 Revision 1 Table of Contents Page Figure 4e AXIAL POWER IMBALANCE Operating Limits 200 +/- 10 EFPD to 450 +/- 10 EFPD, Three RC Pumps Davis-Besse 1, Cycle 21 18 Figure 4f AXIAL POWER IMBALANCE Operating Limits 450 +/- 10 EFPD to EOC, Three RC Pumps Davis-Besse 1, Cycle 21 19 QUADRANT POWER TILT (QPT)

Table 4 QUADRANT POWER TILT Limits for Davis-Besse, Cycle 21 20 Power Peaking Factors Table 5 Power Peaking Factors - FQ for Davis-Besse, Cycle 21 21 Table 6 Power Peaking Factors - FNH for Davis-Besse, Cycle 21 23 Figure 5 Maximum Allowable Radial Peak for F N H for Davis-Besse, Cycle 21 23 Table 7 Maximum Allowable Radial Peak for FNH for Davis-Besse, Cycle 21 24 Reactor Protection System (RPS) Instrumentation Figure 6 Flux-Flux-Flow (or Power/Imbalance/Flow) Allowable Values Davis-Besse 1, Cycle 21 25 Boron Concentration Table 8 Refueling Boron Concentration Limit for Davis-Besse, Cycle 21 26 Rod Program Figure 7 Control Rod Core Locations and Group Assignments for Davis-Besse, Cycle 21 27

Davis-Besse Cycle 21 COLR Page 5 of 27 Revision 1 Figure 1 AXIAL POWER IMBALANCE Protective Limits Davis-Besse 1, Cycle 21 This Figure is referred to by Technical Specification 2.1.1.1 120

(-44.93, 110.2) (32.32, 110.2) 110 4 PUMP LIMIT

(-49.04, 99.5) 100

(-44.93, 90.0) (32.32, 90.0) 90 3 PUMP LIMIT (41.89, 87.4)

(-49.04, 79.3) 80 70 (41.89, 67.2)

Pow er (Percent of RATED THERMAL POWER) 60 UNACCEPTABLE 50 UNACCEPTABLE OPERATION OPERATION 40 ACCEPTABLE OPERATION 30 FOR SPECIFIED RC PUMP 20 COMBINATION 10 0

-80 -70 -60 -50 -40 -30 -20 -10 0 10 20 30 40 50 60 70 80 AXIAL POWER IMBALANCE, %

Required Measured 4 Pump 3 Pump Pumps Reactor Coolant Flow to Ensure Power Negative Positive Power Negative Positive Level Imbalance Imbalance Level Imbalance Imbalance Operating Flow, gpm Compliance, gpm 110.2 -44.93 32.32 90.0 -44.93 32.32 4 380,000 389,500 99.5 -49.04 --- 79.3 -49.04 ---

3 283,860 290,957 87.4 -49.04 41.89 67.2 -49.04 41.89 0.0 -49.04 41.89 0.0 -49.04 41.89

Davis-Besse Cycle 21 COLR Page 6 of 27 Revision 1 Table 1 Shutdown Margin Requirements for Davis-Besse, Cycle 21 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

    • 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.
      • For the period from 0 to 300 EFPD and for power levels 60 %FP and above, rod insertion limits are established that reserve an additional 0.5 %k/k required rod worth to accommodate the implementation of an update to the SBLOCA model.

Davis-Besse Cycle 21 COLR Page 7 of 27 Revision 1 Table 2 Moderator Temperature Coefficient Limit for Davis-Besse, Cycle 21 These limits are referred to by Technical Specifications 3.1.3

1. Lower Limit:

MTC at HFP -3.775x10-4 k/k/°F (-37.75 pcm/°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 21 COLR Page 8 of 27 Revision 1 Table 3 Absolute Position Indicator (API) / Relative Position Indicator (RPI)

Agreement Limit for Davis-Besse, Cycle 21 This limit is referred to by Technical Specifications 3.1.7 The absolute position indicator channels and the relative position indicator channels agree within 3.00%.

Davis-Besse Cycle 21 COLR Page 9 of 27 Revision 1 Figure 2a Regulating Group Position Operating Limits 0 to 300 +10 EFPD, Four RC Pumps Davis-Besse 1, Cycle 21 This Figure is referred to by Technical Specifications 3.2.1 110 100 90 Unacceptable 80 Operation Power (Percent of RATED THERMAL POWER) 70 Operation Restricted 60 Shutdown 50 Margin Limit 40 Acceptable 30 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% betw een sequential w ithdrawn 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 pow er level is 100.37 %RTP.

SDM Limit RI Limit Power RI Power RI 100.37 185.70 100.37 300.00 58.00 118.50 100.37 277.40 33.00 48.50 90.00 266.50 6.30 0.00 78.00 251.50 58.00 246.50 33.00 48.50 6.30 0.00

Davis-Besse Cycle 21 COLR Page 10 of 27 Revision 1 Figure 2b Regulating Group Position Operating Limits After 300 +10 EFPD, Four RC Pumps Davis-Besse 1, Cycle 21 This Figure is referred to by Technical Specifications 3.2.1 110 100 90 Unacceptable 80 Operation Power (Percent of RATED THERMAL POWER)

Operation Restricted 70 60 50 Shutdown Margin 40 Limit Acceptable 30 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% betw een sequential w ithdrawn 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 pow er level is 100.37 %RTP.

SDM Limit RI Limit Power RI Power RI 100.37 260.80 100.37 300.00 58.00 191.50 100.37 277.40 33.00 165.50 90.00 266.50 3.00 0.00 78.00 251.50 58.00 246.50 33.00 165.50 3.00 0.00

Davis-Besse Cycle 21 COLR Page 11 of 27 Revision 1 Figure 2c Regulating Group Position Operating Limits 0 to 300 +10 EFPD, Three RC Pumps Davis-Besse 1, Cycle 21 This Figure is referred to by Technical Specifications 3.2.1 110 100 90 80 Power (Percent of RATED THERMAL POWER)

Unacceptable 70 Operation 60 Shutdown Operation 50 Margin Restricted 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% betw een sequential w ithdrawn 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 pow er level is 75.37 %RTP.

SDM Limit RI Limit Power RI Power RI 75.37 147.30 75.37 300.00 43.10 102.50 75.37 278.10 24.20 32.50 67.00 266.50 4.00 0.00 58.00 251.50 43.00 246.50 24.20 32.50 4.00 0.00

Davis-Besse Cycle 21 COLR Page 12 of 27 Revision 1 Figure 2d Regulating Group Position Operating Limits After 300 +10 EFPD, Three RC Pumps Davis-Besse 1, Cycle 21 This Figure is referred to by Technical Specifications 3.2.1 110 100 90 80 Power (Percent of RATED THERMAL POWER) 70 Unacceptable Operation Operation Restricted 60 50 Shutdown Margin 40 Limit 30 Acceptable 20 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% betw een sequential w ithdrawn 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 pow er level is 75.37 %RTP.

SDM Limit RI Limit Power RI Power RI 75.37 218.50 75.37 300.00 43.10 185.50 75.37 278.10 24.20 104.50 67.00 266.50 1.90 0.00 58.00 251.50 43.00 246.50 24.20 104.50 1.90 0.00

Davis-Besse Cycle 21 COLR Page 13 of 27 Revision 1 Figure 3 APSR Position Operating Limits for Davis-Besse, Cycle 21 This Figure is referred to by Technical Specifications 3.2.2 Before APSR Pull: 0 EFPD to 630 +/- 10 EFPD, Three or Four RC pumps operation*

Lower Limit: 0 %WD Upper Limit: 100 %WD After APSR Pull: 630 +/- 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, however, steam generator analyses limits power to 73.46 %RTP.
    • 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 21 COLR Page 14 of 27 Revision 1 Figure 4a AXIAL POWER IMBALANCE Operating Limits 0 to 200 +/- 10 EFPD, Four RC Pumps Davis-Besse 1, Cycle 21 This Figure is referred to by Technical Specification 3.2.3 110 100 Restricted Restricted Region Region 90 80 70 60 Power (Percent of RATED THERMAL POWER) 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 Note 1: Instrument error is accounted for in these Operating Limits. FULL INCORE Note 2: The Excore Imbalance Operating Limits are available for use when the Full Incore system is non-functional. EXCORE Note 3: Maximum plotted power level is 100.37 %RTP.

Full Incore Excore Negative Positive Negative Positive Power Imbalance Imbalance Power Imbalance Imbalance 100.37 -23.17 15.98 100.37 -15.42 8.69 92.00 -30.11 23.90 92.00 -22.16 16.34 80.00 -37.00 30.06 80.00 -28.94 23.96 60.00 -37.00 31.00 60.00 -35.48 31.00 0.00 -37.00 31.00 0.00 -35.48 31.00

Davis-Besse Cycle 21 COLR Page 15 of 27 Revision 1 Figure 4b AXIAL POWER IMBALANCE Operating Limits 200 +/- 10 EFPD to 450 +/- 10 EFPD, Four RC Pumps Davis-Besse 1, Cycle 21 This Figure is referred to by Technical Specification 3.2.3 110 100 Restricted Restricted Region Region 90 80 70 60 Power (Percent of RATED THERMAL POWER) 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 Note 1: Instrument error is accounted for in these Operating Limits. FULL INCORE Note 2: The Excore Imbalance Operating Limits are available for use when the Full Incore system is non-functional. EXCORE Note 3: Maximum plotted power level is 100.37 %RTP.

Full Incore Excore Negative Positive Negative Positive Power Imbalance Imbalance Power Imbalance Imbalance 100.37 -16.42 15.27 100.37 -9.10 8.01 92.00 -22.21 21.08 92.00 -14.75 13.69 80.00 -29.99 29.27 80.00 -22.36 21.69 60.00 -37.00 31.00 60.00 -29.81 30.26 0.00 -37.00 31.00 0.00 -29.81 30.26

Davis-Besse Cycle 21 COLR Page 16 of 27 Revision 1 Figure 4c AXIAL POWER IMBALANCE Operating Limits 450 +/- 10 EFPD to EOC, Four RC Pumps Davis-Besse 1, Cycle 21 This Figure is referred to by Technical Specification 3.2.3 110 100 Restricted Restricted Region Region 90 80 70 60 Power (Percent of RATED THERMAL POWER) 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 Note 1: Instrument error is accounted for in these Operating Limits. FULL INCORE Note 2: The Excore Imbalance Operating Limits are available for use when the Full Incore system is non-functional. EXCORE Note 3: Maximum plotted power level is 100.37 %RTP.

Full Incore Excore Negative Positive Negative Positive Power Imbalance Imbalance Power Imbalance Imbalance 100.37 -15.18 12.57 100.37 -7.93 5.49 92.00 -20.88 18.17 92.00 -13.50 10.96 80.00 -28.20 25.71 80.00 -20.68 18.35 60.00 -35.88 31.00 60.00 -28.35 25.80 0.00 -35.88 31.00 0.00 -28.35 25.80

Davis-Besse Cycle 21 COLR Page 17 of 27 Revision 1 Figure 4d AXIAL POWER IMBALANCE Operating Limits 0 to 200 +/- 10 EFPD, Three RC Pumps Davis-Besse 1, Cycle 21 This Figure is referred to by Technical Specification 3.2.3 110 100 90 80 Restricted 70 Restricted Region Region 60 Power (Percent of RATED THERMAL POWER) 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 Note 1: Instrument error is accounted for in these Operating Limits. FULL INCORE Note 2: The Excore Imbalance Operating Limits are available for use when the Full Incore system is non-functional. EXCORE Note 3: Maximum plotted power level is 75.37 %RTP.

Full Incore Excore Negative Positive Negative Positive Power Imbalance Imbalance Power Imbalance Imbalance 75.37 -23.45 16.27 75.37 -16.29 9.56 69.00 -30.38 22.45 69.00 -22.93 17.11 60.00 -37.00 26.65 60.00 -29.55 24.57 45.00 -37.00 31.00 45.00 -35.80 31.00 0.00 -37.00 31.00 0.00 -35.80 31.00

Davis-Besse Cycle 21 COLR Page 18 of 27 Revision 1 Figure 4e AXIAL POWER IMBALANCE Operating Limits 200 +/- 10 EFPD to 450 +/- 10 EFPD, Three RC Pumps Davis-Besse 1, Cycle 21 This Figure is referred to by Technical Specification 3.2.3 110 100 90 80 Restricted 70 Restricted Region Region 60 Power (Percent of RATED THERMAL POWER) 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 Note 1: Instrument error is accounted for in these Operating Limits. FULL INCORE Note 2: The Excore Imbalance Operating Limits are available for use when the Full Incore system is non-functional. EXCORE Note 3: Maximum plotted power level is 75.37 %RTP.

Full Incore Excore Negative Positive Negative Positive Power Imbalance Imbalance Power Imbalance Imbalance 75.37 -16.71 15.55 75.37 -9.97 8.89 69.00 -22.48 21.34 69.00 -15.53 14.46 60.00 -30.22 26.65 60.00 -22.97 22.30 45.00 -37.00 31.00 45.00 -30.13 30.57 0.00 -37.00 31.00 0.00 -30.13 30.57

Davis-Besse Cycle 21 COLR Page 19 of 27 Revision 1 Figure 4f AXIAL POWER IMBALANCE Operating Limits 450 +/- 10 EFPD to EOC, Three RC Pumps Davis-Besse 1, Cycle 21 This Figure is referred to by Technical Specification 3.2.3 110 100 90 80 Restricted 70 Restricted Region Region 60 Power (Percent of RATED THERMAL POWER) 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 Note 1: Instrument error is accounted for in these Operating Limits. FULL INCORE Note 2: The Excore Imbalance Operating Limits are available for use when the Full Incore system is non-functional. EXCORE Note 3: Maximum plotted power level is 75.37 %RTP.

Full Incore Excore Negative Positive Negative Positive Power Imbalance Imbalance Power Imbalance Imbalance 75.37 -15.47 12.86 75.37 -8.80 6.36 69.00 -21.14 18.44 69.00 -14.27 11.74 60.00 -28.42 25.94 60.00 -21.29 18.97 45.00 -36.05 31.00 45.00 -28.66 26.12 0.00 -36.05 31.00 0.00 -28.66 26.12

Davis-Besse Cycle 21 COLR Page 20 of 27 Revision 1 Table 4 QUADRANT POWER TILT Limits for Davis-Besse, Cycle 21 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 6.23 10.03 20.00 Detector System Minimum Incore Detector System 3.84 2.65 4.40 20.00 with no dropped rod*

Minimum Incore Detector System 3.35 2.32 4.40 20.00 with a dropped rod*

  • These operating limits are based on the condition that no individual long emitter detector affecting the Minimum Incore Detector System tilt calculation exceeds 73% sensitivity depletion, which is the case for Cycle 21.

Davis-Besse Cycle 21 COLR Page 21 of 27 Revision 1 Table 5 Power Peaking Factors - FQ for Davis-Besse, Cycle 21 This Table is referred to by Technical Specifications 3.2.5 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 = 6.4265 kW/ft at 2817 MWt for all fuel P = ratio of THERMAL POWER / RATED THERMAL POWER (current fraction of power)

Bu = fuel burnup (MWd/mtU)

Note: 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. The core monitoring system computer-generated FQ values are augmented by the required uncertainties.

UO2 Fuel (Mark-B-HTP) - All Batches except Batch 23A LHRALLOW kW/ft(a) 0 34,000 62,000 Core Elevation (ft) MWd/mtU MWd/mtU MWd/mtU 0 17.35 14.95 10.85 2.506 17.35 14.95 10.85 4.264 17.25 14.85 10.85 6.021 16.8 14.8 11.1 7.779 17.0 14.7 11.1 9.536 16.2 14.3 11.1 12.000 15.4 13.5 10.4 (a) Linear interpolation for allowable LHR between specified burnup points is valid for these tables.

Davis-Besse Cycle 21 COLR Page 22 of 27 Revision 1 Table 5 (continued)

UO2 Fuel (Mark-B-HTP) - Batch 23A LHRALLOW kW/ft(a) 0 34,000 Core Elevation (ft) MWd/mtU MWd/mtU 0 16.95 14.95 2.506 16.95 14.95 4.264 16.85 14.85 6.021 16.4 14.8 7.779 16.6 14.7 9.536 15.8 14.3 12.000 15.0 13.5 4 wt% Gad 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 15.55 13.45 9.55 2.506 15.55 13.45 9.55 4.264 15.45 13.25 9.55 6.021 15.1 13.2 9.8 7.779 15.3 13.2 9.8 9.536 14.6 12.8 9.8 12.000 13.8 12.1 9.2 8 wt% Gad 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 14.65 12.65 8.75 2.506 14.65 12.65 8.75 4.264 14.55 12.65 8.75 6.021 14.2 12.5 9.0 7.779 14.4 12.5 9.0 9.536 13.7 12.2 9.0 12.000 13.0 11.5 8.4 (a) Linear interpolation for allowable LHR between specified burnup points is valid for these tables.

Davis-Besse Cycle 21 COLR Page 23 of 27 Revision 1 Table 6 Power Peaking Factors - F H for Davis-Besse, Cycle 21 N

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 = 1.00 for 4-RCP operation Pm = 0.75 for 3-RCP operation 1/RH = 0.3 RH = 3.33 Note: The measured FNH shall be increased by 5.0% to account for measurement uncertainty prior to comparing to the limits. The core monitoring system-generated FNH values are augmented by the required uncertainties.

Figure 5 Maximum Allowable Radial Peak for FNH for Davis-Besse, Cycle 21 *

  • Linear interpolation is acceptable.

Davis-Besse Cycle 21 COLR Page 24 of 27 Revision 1 Table 7 Maximum Allowable Radial Peak for F H for Davis-Besse, Cycle 21 N

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 21 COLR Page 25 of 27 Revision 1 Figure 6 Flux-Flux-Flow (or Power/Imbalance/Flow)

Allowable Values, Davis-Besse 1, Cycle 21 This Figure is referred to by Technical Specification 3.3.1 120 110 4 PUMP LIMIT

(-17.0, 108.0) (17.0, 108.0) 100

(-30.6, 94.4) 90 80 3 PUMP (30.6, 77.1)

EXAMPLE 70 Pow er (Percent of RATED THERMAL POWER) 60 50 UNACCEPTABLE UNACCEPTABLE OPERATION OPERATION 40 30 ACCEPTABLE OPERATION FOR SPECIFIED RC PUMP 20 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 reactor coolant system flow with three pumps.

These limits are based on Cycle 9 and are conservative relative to the actual Cycle 21 limits.

Davis-Besse Cycle 21 COLR Page 26 of 27 Revision 1 Table 8 Refueling Boron Concentration Limit for Davis-Besse, Cycle 21 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 21 COLR Page 27 of 27 Revision 1 Figure 7 Control Rod Core Locations and Group Assignments for Davis-Besse, Cycle 21 This Figure is referred to by Technical Requirements Manual 8.1.3 N (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

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