L-19-245, Core Operating Limits Report, Cycle 21, Revision 2

Core Operating Limits Report, Cycle 21, Revision 2

ML19297F583
Person / Time
Site:	Davis Besse
Issue date:	10/23/2019
From:	Bezilla M FirstEnergy Nuclear Operating Co
To:	Document Control Desk, Office of Nuclear Reactor Regulation
References
L-19-245
Download: ML19297F583 (31)

Text

FENOC FirstEnerQy Nuc/o(-Jr Operati11g Go,'11,p&"ly . . . .

5501 North State Route 2 Oak Harbor, Ohio 43449 Mark B. Bezilla 419-321-7676 Vice President - Nuclear Fax: 419-321-7582 October 23, 2019 L-19-245 ATTN: 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 2 Enclosed is Revision 2 to the Davis-Besse Nuclear Power Station, Unit No. 1 (DBNPS)

Cycle 21 Core Operating Limits Report (COLR). This revision implements two sets of reactor protect system (RPS) Flux/Delta Flux/Flow Allowable Values curves, Figures 6a and 6b. The two sets of curves represent the Allowable Values supporting the current RPS Flux/Delta Flux/Flow trip setpoints, Figure 6a, and the revised, more conservative, Allowable Values supporting the RPS Flux/Delta Flux/Flow trip setpoints developed as part of an upcoming engineering change, Figure 6b. The changes to RPS Flux/Delta Flux/Flow Allowable Values and corresponding trip setpoints are being made based on more restrictive Allowable Values being developed during the Cycle 22 core reload analysis.

Implementation of this engineering change, which will modify the RPS Flux/Delta Flux/Flow trip setpoints, is presently planned for a staggered implementation by RPS channel starting in December 2019 and concluding in February 2020.

Additionally, this revision updates the Regulating Group Position Operating limits (Rod Insertion limits) Figures 2b and 2d to conservatively provide additional margin due to a potential for the original limits becoming non-conservative based upon changes to the reactor coolant system average temperature to reactor power correlation resulting from steam generator fouling.

Submittal of this revision is in accordance with DBNPS Technical Specification 5.6.3, "CORE OPERATING LIMITS REPORT (COLR)."

Davis-Besse Nuclear Power Station, Unit No. 1 L 19-245 Page 2 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.

i:luto Mark B. Bezilla

Enclosure:

Cycle 21, Core Operating Limits Report, Revision 2 cc: NRC Region Ill Administrator NRC Resident Inspector NRR Project Manager Utility Radiological Safety Board

Enclosure L-19-245 Cycle 21, Core Operating Limits Report, Revision 2 (28 pages follow)

Davis-Besse Cycle 21 COLR Page 1 of 28 Revision 2 FIRSTENERGY NUCLEAR OPERATING COMPANY DAVIS-BESSE UNIT 1 CYCLE 21 CORE OPERATING LIMITS REPORT Prepared by Jl4t.'(£> ~

D. . Kelley 1<>/2/2, Reviewed by~A, . Glass

/(J/(o/lCf Approved by lj?d3J. ~ /tJ/to./t 9.

D. Brown

Davis-Besse Cycle 21 COLR Page 2 of 28 Revision 2 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. SL2.1.1.1 Reactor Core Safety Limits

2. LCO 3.1.1 SHUTDOWN MARGIN (SOM)

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 28 Revision 2 Table of Contents Pae Reactor Core Safety Lim its 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 1O 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 28 Revision 2 Table of Contents Pae 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 - Fa for Davis-Besse, Cycle 21 21 Table 6 Power Peaking Factors - FN.:'.iH for Davis-Besse, Cycle 21 23 Figure 5 Maximum Allowable Radial Peak for FN.:'.iH for Davis-Besse, Cycle 21 23 Table 7 Maximum Allowable Radial Peak for FNiiH for Davis-Besse, Cycle 21 24 Reactor Protection System (RPS) Instrumentation Figure 6a Flux-~Flux-Flow (or Power/Imbalance/Flow) Allowable Values Davis-Besse 1, Cycle 21 Before EC 19-0137 25 Figure 6b Flux-~Flux-Flow (or Power/Imbalance/Flow) Allowable Values Davis-Besse 1, Cycle 21 After EC 19-0137 26 Boron Concentration Table 8 Refueling Boron Concentration Limit for Davis-Besse, Cycle 21 27 Rod Program Figure 7 Control Rod Core Locations and Group Assignments for Davis-Besse, Cycle 21 28

Davis-Besse Cycle 21 COLR Page 5 of 28 Revision 2 Figure 1 AXIAL POWER IMBALANCE Protectiw Limits Da"1s-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) 0 3 PUMP LIMIT (41.89, 87.4)

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

~ 60

_J

~

UNACCEPTABLE ffi I

50 UNACCEPTABLE OPERATION I-OPERATION I- 40

~ ACCEPTABLE 0 OPERATION cQ) FOR SPECIFIED

(.) 30 ta:;

RC PUMP

~ 20 COMBINATION 10

-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 Flow to Ensure Power Negatiw Positiw Power Negatiw Positiw Lewi Imbalance Imbalance Lewi Imbalance Imbalance m

110.2 -44.93 32.32 90.0 -44.93 32.32 99.5 -49.04 - 79.3 -49.04 -

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 28 Revision 2 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

• 2: 1 %dk/k *** 3.1.4, 3.1.5 MODE 2

• 2: 1 %dk/k 3.1.4, 3.1.5, 3.3.9 MODE3 =::: 1 %dk/k 3.1.1, 3.3.9 MODE4 2: 1 %dk/k 3.1.1, 3.3.9 MODE5 2: 1 %dk/k 3.1.1, 3.3.9 MODE 1 PHYSICS TESTS 2: 1 %dk/k 3.1.8 Exceptions **

MODE 2 PHYSICS TESTS 2: 1 %dk/k 3.1.9 Exceptions

• The required Shutdown Margin capability of 1 %dk/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 %dk/k via alternate verification or calculation.

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

Davis-Besse Cycle 21 COLR Page 7 of 28 Revision 2 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:

1.0E-04 C

G) 9.0E-05 I

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Davis-Besse Cycle 21 COLR Page 8 of 28 Revision 2 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 28 Revision 2 Figure 2a Regulating Group Position Operating Limits 0 to 300 +/-10 EFPD, Four RC Pumps Da\lis-Besse 1, Cycle 21 This Figure is referred to by Technical Specifications 3.2.1 110 100 , -

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0 0 25 50 75 100 125 150 175 200 225 250 275 300 Rod Index, % Withdrawn

~ 7f 190 Group 5

~ 3s 7[ 190 Group6 9Group 7 215 1qo Note 1: A Rod Group overlap of 25 +/- 5% between sequential w ithdra.vn groups 5 and 6, and 6 and 7, shall be maintained .

Note 2: lnstrurrent error is accounted for in these Operating Units.

Note 3: Maxim.Jm plotted pow er level is 100.37 %RTP.

SOM 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 28 Revision 2 Figure 2b Regulating Group Position Operating Limits After 300 .+/-.10 EFPD, Four RC Pumps Da\As-Besse 1, Cycle 21 This Figure is referred to by Technical Specifications 3.2.1 l

110 100 J J

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~ 7[ 190 Group 5

~ 3s 7[ 190 Group 6

~ 2,5 1qo Group 7 Note 1: A Rod Group overlap of 25+/- 5% between sequentialwithdravmgroups Sand 6, and 6 and 7, shall be maintained.

Note 2: Instrument error is accounted for in these Operating Limts .

Note 3: Maxirrum plotted power 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 25.50 165.50 78.00 251 . 50 3.00 0.00 58.00 246.50 33.00 165.50 25.50 165.50 3 .00 0.00

Davis-Besse Cycle 21 COLR Page 11 of 28 Revision 2 Figure 2c Regulating Group Position Operating Limits 0 to 300 +/-10 EFPD, Three RC Pumps Da\As-Besse 1, Cycle 21 This Figure is referred to by Technical Specifications 3.2.1 110 100 90 c? 80 w

s 0

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~ 7e 190 Group 5

~ 3s 7[ 190 Group 6 a 25 1qo Group 7 Note 1: A Rod Group overlap of 25 +/- 5% between sequential w ithdravm groups 5 and 6, and 6 and 7, shall be maintained.

Note 2: lnstrurrent error is accounted for in these Operating Lirrits .

Note 3: Maxi1TUm plotted pow er level is 75.37 %RTP.

SOM 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 CO LR Page 12 of 28 Revision 2 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 c? 80 w

s0 "'

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~ 7r 1qo Group5

~ 215 7[ 190 Group6

~ 3s 10,0 Group 7 Note 1: A Rod Group overlap of 25 +/- 5% between sequential w ithdravvn groups 5 and 6, and 6 and 7, shall be rraintained .

Note 2: Instrument error is accounted for in these Operating Lirrits .

Note 3: Maximum plotted pow er level is 75.37 %RTP.

SOM 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 17.70 104.50 58.00 251.50 1.90 0.00 43.00 246.50 24.20 104. 50 17.70 104. 50 1.90 0.00

Davis-Besse Cycle 21 COLR Page 13 of 28 Revision 2 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 %WO Upper Limit: 100 %WO After APSR Pull: 630 +/- 10 EFPD to End-of-Cycle Three or Four RC pumps operation*

Insertion Prohibited (maintain 2: 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 28 Revision 2 Figure 4a AXIAL POWER IMBALANCE Operating Limits 0 to 200 +/- 10 EFPD, Four RC Pumps Da\As-Besse 1, Cycle 21 This Figure is referred to by Technical Specification 3.2.3 110 I

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-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. i=OCL"7NCORE Note 2: The Excore Im balance Operating Lim its are available for use when the Full lncore system is non-functional. EXCORE Note 3: Maxim um plotted power level is 100.37 %RTP. 0 Full lncore Excore Negath.e Positiw Negatiw Positiw 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 28 Revision 2 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 I

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-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 Lim its are available for use when the Full lncore system is non-functional. EXCORE Note 3: Maximum plotted power level is 100.37 3/4RTP. 0 Full lncore Excore Negatiw Positiw Negatiw Positiw 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 28 Revision 2 Figure 4c AXIAL POWER IMBALANCE Operating Limits 450 +/- 10 EFPD to EOC, Four RC Pumps Da\As-Besse 1, Cycle 21 This Figure is referred to by Technical Specification 3.2.3 110 I

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-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. FU['['"iJCQRE Note 2: The Excore Im balance Operating Lim its are available for use when the Full lncore system is non-functional. EXCORE Note 3: Maxim um plotted power level is 100.37 %RTP. 0 Full lncore Excore Negath.e Posith.e Negath.e Posith.e 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 28 Revision 2 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.

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

Note 1: Instrument error is accounted for in these Operating Limits.

Note 2: The Excore Imbalance Operating Limitsareavailableforusewhenthe Full lncore system is non-functional. EXCORE Note 3: Maximum plotted power level is 75.37 %RTP. 0 Full lncore Excore Negatiw Positiw Negatiw Positiw 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 28 Revision 2 Figure 4e AXIAL POWER IMBALANCE Operating Limits 200 +/- 10 EFPDto 450 +/- 10 EFPD, Three RC Pumps Da\1s-Besse 1, Cycle 21 This Figure is referred to by Technical Specification 3.2.3 110 I

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LEGB'-0 Note 1 : Instrument error is accounted for in these Operating Limits. FULL INCORE Note 2: The Excore Im balance Operating Lim its are available for use when the Full lncore system is non-functional. EXCORE Note 3: Maximum plotted power level is 75.37 %RTP. 0 Full lncore Excore Negatiw Positiw Negatiw Posith.e 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 28 Revision 2 Figure 4f AXIAL POWER IMBALANCE Operating Limits 450 +/- 10 EFPD to EOC, Three RC Pumps Da\As-Besse 1, Cycle 21 This Figure is referred to by Technical Specification 3.2.3 110 I

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LEGEND Note 1: Instrument error is accounted for in these Operating Limits. i=O(('iFJCQRE Note 2: The Excore Imbalance Operating Limits are available for use when the Full lncore system is non-functional. EXCORE Note 3: Maximum plotted power level is 75.37 3/4RTP. 0 Full lncore Excore Negath.e Posith.e Negatiw Positiw 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 28 Revision 2 Table 4 QUADRANT POWER TILT Limits for Davis-Besse, Cycle 21 This Table is referred to by Technical Specifications 3.2.4 From O EFPD to EOC Stea,dy-state Limit Steady-state Lim it QUADRANT for THERMAL for THERMAL POWER TILT as POWERS 60% POWER >60% Transient Limit Maximum Limit measured by: (%) (%) (%) (%)

Symmetric lncore 7.90 6.23 10.03 20.00 Detector System Minimum lncore Detector System 3.84 2.65 4.40 20.00 with no dropped rod*

Minimum lncore 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 lncore Detector System tilt calculation exceeds 73% sensitivity depletion, which is the case for Cycle 21.

Davis-Besse Cycle 21 COLR Page 21 of 28 Revision 2 Table 5 Power Peaking Factors - Fa for Davis-Besse, Cycle 21 This Table is referred to by Technical Specifications 3.2.5 Heat Flux Hot Channel Factor Fa Fa shall be limited by the following relationships:

Fa :s; LHRallow (Bu)/ [LHRavg

• P] (for P :s; 1.0)

LHRallow (Bu) =Seethe 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 Fa 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-8-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 28 Revision 2 Table 5 (continued)

UO2 Fuel (Mark-B-HTP) - Batch 23A LHRALLow kW/tt<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/tt<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 28 Revision 2 Table 6 Power Peaking Factors - FNt1H for Davis-Besse, Cycle 21 This Table is referred to by Technical Specifications 3.2.5 Enthalpy Rise Hot Channel Factors - FN.t1H FN.t1H :5 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 :51.0 Pm = 1.00 for 4-RCP operation Pm = 0.75 for 3-RCP operation 1/RH = 0.3 RH = 3.33 Note: The measured FN.t1H shall be increased by 5.0% to account for measurement uncertainty prior to comparing to the limits. The core monitoring system-generated FN.t1H values are augmented by the required uncertainties.

Figure 5 Maximum Allowable Radial Peak for FNl1H for Davis-Besse, Cycle 21

• 2.2 x/L=l.O -+- x/L=0.9

. *.- **, *,*x/L=0.88 x/L=0.8

.....;- x/L=0.6 ......... x/L=0.5

~ x/L=0.4 ~ x/L=0.2

........ x/L=0.14 -a-x/L=0.1

-+- x/L=0.0 1.3 1.10 1.20 1.30 1.40 1.50 1.60 1.70 1.80 1.90 Axial Peak

• Linear interpolation is acceptable.

Davis-Besse Cycle 21 COLR Page 24 of 28 Revision 2 Table 7 Maximum Allowable Radial Peak for FNllH for Davis-Besse, Cycle 21 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 28 Revision 2 Figure 6a Flux-~Flux-Flow (or Power/Im balance/Flow)

Allowable Values Davis-Besse 1, Cycle 21 Before EC 19-0137 I This Figure is referred to by Technical Specification 3.3.1 120 I I

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The 3 pump example curve shows allowable values for an approximately25% flow reduction for three pump operation (283,860 9pm). The actual setpointwill be calculated by the Reactor Protection System and will be directly proportional to the actual reactorcoolantsystem 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 28 Revision 2 Figure 6b Flux-L'.lFlux-Flow (or Power/Im balance/Flow)

Allowable Values Davis-Besse 1, Cycle21 After EC 19-0137 l

This Figure is referred to by Technical Specification 3. 3. 1 120 I I I I I I I I I I I 110 _._ 4 PUMP LIMIT

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The 3 pump example curve shows allowable values for an approximately25% flow reduction for three pump operation (283,860 gpm ). The actual setpointwill be calculated by the Reactor Protection System and will be directly proportional to the actual reactorcoolantsystem flow with three pumps.

These limits are based on EC 19-0137 and are conservative relative to the actual Cycle 21 limits .

Davis-Besse Cycle 21 COLR Page 27 of 28 Revision 2 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 Kett of 0.95 or less, plus an additional 1% ~k/k conservatism allowance for uncertainties.

Davis-Besse Cycle 21 COLR Page 28 of 28 Revision 2 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 I I I I I 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 0 4 6 4 p R

0Group 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