ML25335A082

Cycle 28 Core Operating Limits Report Revision 0

ML25335A082
Person / Time
Site:	Sequoyah
Issue date:	12/01/2025
From:	Michael K Tennessee Valley Authority
To:	Office of Nuclear Reactor Regulation, Document Control Desk
References
Download: ML25335A082 (0)

Text

Sequoyah Nuclear Plant, P.O. Box 2000, Soddy Daisy, Tennessee 37384 December 1, 2025 10 CFR 50.4 ATTN: Document Control Desk U.S. Nuclear Regulatory Commission Washington, D.C. 20555-0001 Sequoyah Nuclear Plant, Unit 1 Renewed Facility Operating License No. DPR-77 NRC Docket No. 50-327

Subject:

SEQUOYAH UNIT 1 CYCLE 28 CORE OPERATING LIMITS REPORT REVISION 0 In accordance with Sequoyah Nuclear Plant (SQN) Unit 1 Technical Specification (TS) 5.6.3.d, enclosed is the Unit 1 Cycle 28 Core Operating Limits Report (COLR), Revision 0 that was issued on November 7, 2025.

There are no new regulatory commitments in this letter. If you have any questions, please contact Rick Medina, SQN Site Regulatory Compliance Manager at (423) 843-8129 or rmedina4@tva.gov.

Respectfully, Kevin M. Michael Site Vice President Sequoyah Nuclear Plant

Enclosure:

Sequoyah Unit 1 Cycle 28 Core Operating Limits Report, Revision 0 cc (Enclosure):

NRC Regional Administrator - Region II NRC Senior Resident Inspector - SQN Michael, Kevin Mckinley Digitally signed by Michael, Kevin Mckinley Date: 2025.12.01 09:56:54

-05'00'

ENCLOSURE SEQUOYAH UNIT 1 CYCLE 28 CORE OPERATING LIMITS REPORT REVISION 0

COLR FOR SEQUOYAH UNIT 1 CYCLE 28 Unit 1 Cycle 28 SEQUOYAH Page 2 of 16 Revision 0 1.0 CORE OPERATING LIMITS REPORT This Core Operating Limits Report (COLR) for Sequoyah Nuclear Plant Unit 1 has been prepared in accordance with the requirements of the Technical Specifications (TS) 5.6.3.

The Technical Specifications affected by this report are listed below:

TS Section Technical Specification COLR Parameter COLR Section 2.1.1 Reactor Core Safety Limits Reactor Core Safety Limits 2.1 3.1.1 SHUTDOWN MARGIN (SDM)

SDM 2.2.1 2.2.2 3.1.3 Moderator Temperature Coefficient (MTC)

BOL MTC Limit EOL MTC Limit 300 ppm Surveillance Limit 60 ppm Surveillance Limit 2.3.1 2.3.1 2.3.2 2.3.3 3.1.4 Rod Group Alignment Limits SDM 2.2.3 3.1.5 Shutdown Bank Insertion Limits Shutdown Bank Insertion Limits SDM 2.4 2.2.4 3.1.6 Control Bank Insertion Limits Control Bank Insertion Limits SDM 2.5 2.2.5 3.1.8 PHYSICS TESTS Exceptions -

MODE 2 SDM 2.2.6 3.2.1 Heat Flux Hot Channel Factor (FQ(Z))

FQRTP K(Z)

FQW(Z)

[T(Z)]COLR Axy(Z) Factor Rj Penalty Factor Thermal Power Limits UFQ 2.6.1 2.6.2 2.6.3 2.6.4 2.6.5 2.6.6 2.6.7 2.6.8 3.2.2 Nuclear Enthalpy Rise Hot Channel Factor (F'HN)

F'HN 2.7 3.2.3 Axial Flux Difference (AFD)

AFD Limits 2.8 3.3.1 Reactor Trip System (RTS)

Instrumentation Overtemperature T Trip Setpoints Overpower T Trip Setpoints QTNL, QTPL, QTNS, and QTPS QPNL, QPPL, QPNS, and QPPS 2.9.1 2.9.2 2.9.3 2.9.4 3.4.1 RCS Pressure, Temperature, and Flow Departure from Nucleate Boiling (DNB) Limits Pressurizer pressure RCS average temperature RCS flow 2.10 3.9.1 Boron Concentration Refueling Boron Concentration 2.11

COLR FOR SEQUOYAH UNIT 1 CYCLE 28 Unit 1 Cycle 28 SEQUOYAH Page 3 of 16 Revision 0 2.0 OPERATING LIMITS The cycle-specific parameter limits for the specifications listed in Section 1.0 are presented in the following subsections. These limits have been developed using the NRC approved methodologies specified in the Technical Specifications 5.6.3.

The following abbreviations are used in this section:

ARO All Rods Out BOL Beginning of Cycle Life DNB Departure from Nucleate Boiling EOL End of Cycle Life HZP Hot Zero Thermal Power MTC Moderator Temperature Coefficient PDMS --

Power Distribution Monitoring System RA Required Action RAOC --

Relaxed Axial Offset Control RCS Reactor Coolant System ROS RAOC Operating Space RTP Rated Thermal Power SDM Shutdown Margin 2.1 REACTOR CORE SAFETY LIMITS (Safety Limit 2.1.1)

In MODES 1 and 2, the combination of THERMAL POWER, RCS highest loop average temperature, and pressurizer pressure shall not exceed the limits in Figure 1.

2.2 SHUTDOWN MARGIN (LCO 3.1.1, 3.1.4, 3.1.5, 3.1.6, 3.1.8) 2.2.1 For TS 3.1.1, SDM shall be 1600 pcm in MODE 2 with keff < 1.0, MODE 3 and MODE 4.

2.2.2 For TS 3.1.1, SDM shall be 1000 pcm in MODE 5.

2.2.3 For TS 3.1.4, SDM shall be 1600 pcm in MODE 1 and MODE 2.

2.2.4 For TS 3.1.5, SDM shall be 1600 pcm in MODE 1 and MODE 2.

2.2.5 For TS 3.1.6, SDM shall be 1600 pcm in MODE 1 and MODE 2 with keff 1.0.

2.2.6 For TS 3.1.8, SDM shall be 1600 pcm in MODE 2.

COLR FOR SEQUOYAH UNIT 1 CYCLE 28 Unit 1 Cycle 28 SEQUOYAH Page 4 of 16 Revision 0 2.3 MODERATOR TEMPERATURE COEFFICIENT - MTC (LCO 3.1.3) 2.3.1 The MTC limits are:

The MTC shall be < 0 pcm/qF (upper limit).

With the BOL/ARO/HZP - MTC > -1.234 pcm/qF (BOL MTC limit),

establish control rod withdrawal limits to ensure the MTC remains < 0 pcm/qF (upper limit) for all times in core life.

The EOL/ARO/RTP - MTC shall be -44.0 pcm/qF (lower limit).

2.3.2 The 300 ppm surveillance limit is:

The 300 ppm/ARO/RTP-MTC should be -37.5 pcm/qF.

2.3.3 The 60 ppm surveillance limit is:

The measured 60 ppm /ARO/RTP-MTC should be -41.5 pcm/qF.

2.4 SHUTDOWN BANK INSERTION LIMITS (LCO 3.1.5) 2.4.1 The shutdown banks shall be withdrawn to a position 225 steps withdrawn.

2.5 CONTROL BANK INSERTION LIMITS (LCO 3.1.6) 2.5.1 The control banks are fully withdrawn or shall be limited in physical insertion as shown in Figure 2.

2.5.2 Each control bank shall be considered fully withdrawn from the core at 225 steps.

2.5.3 The control banks shall be operated in sequence by withdrawal of Bank A, Bank B, Bank C, and Bank D. The control banks shall be sequenced in reverse order upon insertion.

2.5.4 Each control bank not fully withdrawn from the core shall be operated with the following overlap as a function of park position.

Park Position (steps)

Bank Overlap (steps)

Bank Difference Tip-to-Tip Separation (steps) 225 97 128 226 98 128 227 99 128 228 100 128 229 101 128 230 102 128 231 103 128

COLR FOR SEQUOYAH UNIT 1 CYCLE 28 Unit 1 Cycle 28 SEQUOYAH Page 5 of 16 Revision 0 2.6 HEAT FLUX HOT CHANNEL FACTOR - FQ(Z) (LCO 3.2.1)









where:









2.6.1

= 2.65 2.6.2 K(Z) = 1.000 for all Z.

2.6.3









where:





and,

is the measured planar radial peaking factor.

 evaluations are not applicable for axial core regions, measured in percent of core height:

a. Lower core region, from 0 to 10% inclusive,

b. Upper core region, from 90 to 100% inclusive,

c. Grid plane regions, +/-2% inclusive, and

d. Core plane regions, within +/-2% of the bank demand positions of the control banks.

2.6.4 values are provided in Table 1 for ROS1 and in Table 2 for ROS2.

2.6.5 The factors adjust the surveillance to the reference conditions assumed in generating the factors. may be assumed to equal 1.0 or may be determined for specific surveillance conditions using the approved methods listed in TS 5.6.3.

COLR FOR SEQUOYAH UNIT 1 CYCLE 28 Unit 1 Cycle 28 SEQUOYAH Page 6 of 16 Revision 0 2.6.6 The penalty factors account for the potential decrease in transient FQ margin between surveillances. The factors for ROS1 and ROS2 are provided in Tables 3 and 4 respectively.

2.6.7 Table 5 provides the required limits on THERMAL POWER and the required AFD reductions for each ROS in the event that additional margin is required.

2.6.8 The uncertainty, UFQ, to be applied to measured FQ(Z) shall be calculated by the following:

UFQ = Uqu

• Ue where:

Uqu = Base FQ measurement uncertainty = 1.05 when PDMS is inoperable (Uqu is defined by PDMS and cannot be less than 1.05 when OPERABLE)

Ue = Engineering uncertainty factor = 1.03 2.7 NUCLEAR ENTHALPY RISE HOT CHANNEL FACTOR - F'HN (LCO 3.2.2)

F'HN

• UH d F'HRTP * ( 1 + PFH * ( 1-P))

where P = Thermal Power / Rated Thermal Power F'HRTP = 1.70 PFH

= 0.3 The uncertainty, UH, to be applied to measured FHN shall be 1.04 when PDMS is inoperable (UH is defined by PDMS and cannot be less than 1.04 when OPERABLE).

2.8 AXIAL FLUX DIFFERENCE - AFD (LCO 3.2.3)

The AFD limits are provided in Figure 3.

COLR FOR SEQUOYAH UNIT 1 CYCLE 28 Unit 1 Cycle 28 SEQUOYAH Page 7 of 16 Revision 0 2.9 REACTOR TRIP SYSTEM (RTS) INSTRUMENTATION (LCO 3.3.1) 2.9.1 Overtemperature T Trip Setpoints Parameter Value Overtemperature T reactor trip setpoint K1 1.15 Overtemperature T reactor trip setpoint Tavg coefficient K2 0.015/°F Overtemperature T reactor trip setpoint pressure coefficient K3 = 0.0008/psig Nominal Tavg at RTP T' 578.2°F Nominal RCS operating pressure P' = 2235 psig Measured RCS T lead/lag time constants 4 5 sec 5 3 sec Measured RCS average temperature lead/lag time constants 1 33 sec 2 4 sec 2.9.2 Overpower T Trip Setpoints Parameter Value Overpower T reactor trip setpoint K4 1.087 Overpower T reactor trip setpoint Tavg rate/lag coefficient K5 0.02/°F for increasing Tavg 0/°F for decreasing Tavg Overpower T reactor trip setpoint Tavg heatup coefficient K6 0.0011/°F when T > T 0/°F when T T Nominal Tavg at RTP T" 578.2°F Measured RCS T lead/lag time constants 4 5 sec 5 3 sec Measured RCS average temperature rate/lag time constant 3 10 sec 2.9.3 Trip Reset Term [f1(I)] for Overtemperature T Trip The following parameters are required to specify the power level-dependent f1(I) trip reset term limits for TS Table 3.3.1-1 (function 6), Overtemperature T trip function:

2.9.3.1 QTNL = -20%

where QTNL = the maximum negative I setpoint at RATED THERMAL POWER at which the trip setpoint is not reduced by the axial power distribution.

2.9.3.2 QTPL = +5%

where QTPL = the maximum positive I setpoint at RATED THERMAL POWER at which the trip setpoint is not reduced by the axial power distribution.

2.9.3.3 QTNS = 2.50%

where QTNS = the percent reduction in Overtemperature T trip setpoint for each percent that the magnitude of I exceeds its negative limit at RATED THERMAL POWER (QTNL).

2.9.3.4 QTPS = 1.40%

where QTPS = the percent reduction in Overtemperature T trip setpoint for each percent that the magnitude of I exceeds its positive limit at RATED THERMAL POWER (QTPL).

COLR FOR SEQUOYAH UNIT 1 CYCLE 28 Unit 1 Cycle 28 SEQUOYAH Page 8 of 16 Revision 0 2.9.4 Trip Reset Term [f2(I)] for Overpower T Trip The following parameters are required to specify the power level-dependent f2(I) trip reset term limits for TS Table 3.3.1-1 (function 7), Overpower T trip function:

2.9.4.1 QPNL = 0%

where QPNL = the maximum negative I setpoint at RATED THERMAL POWER at which the trip setpoint is not reduced by the axial power distribution.

2.9.4.2 QPPL = 0%

where QPPL = the maximum positive I setpoint at RATED THERMAL POWER at which the trip setpoint is not reduced by the axial power distribution.

2.9.4.3 QPNS = 0%

where QPNS = the percent reduction in Overpower T trip setpoint for each percent that the magnitude of I exceeds its negative limit at RATED THERMAL POWER (QPNL).

2.9.4.4 QPPS = 0%

where QPPS = the percent reduction in Overpower T trip setpoint for each percent that the magnitude of I exceeds its positive limit at RATED THERMAL POWER (QPPL).

2.10 RCS PRESSURE, TEMPERATURE, AND FLOW DEPARTURE FROM NUCLEATE BOILING (DNB) LIMITS (LCO 3.4.1)

Parameter Indicated Value Pressurizer pressure 2220 psia RCS average temperature 583F RCS flow 378,400 gpm 2.11 REFUELING BORON CONCENTRATION (LCO 3.9.1)

The refueling boron concentration shall be t 2000 ppm.

COLR FOR SEQUOYAH UNIT 1 CYCLE 28 Unit 1 Cycle 28 SEQUOYAH Page 9 of 16 Revision 0 Figure 1 Reactor Core Safety Limits RCS T-avg Versus Rated Thermal Power

COLR FOR SEQUOYAH UNIT 1 CYCLE 28 Unit 1 Cycle 28 SEQUOYAH Page 10 of 16 Revision 0 Figure 2 Control Bank Insertion Limits Versus Rated Thermal Power Four Loop Operation Notes: The above control bank insertion limits are applicable to both ROS1 and ROS2.

Fully withdrawn region shall be the condition where shutdown and control banks are at a position within the interval of t 225 and d 231 steps withdrawn.

COLR FOR SEQUOYAH UNIT 1 CYCLE 28 Unit 1 Cycle 28 SEQUOYAH Page 11 of 16 Revision 0 Figure 3 Axial Flux Difference Acceptable Operation Limits as a function of Rated Thermal Power (RAOC)

ŽZdWŽ

&/

ZK^

Z

ZK^

Z



h h

COLR FOR SEQUOYAH UNIT 1 CYCLE 28 Unit 1 Cycle 28 SEQUOYAH Page 12 of 16 Revision 0 Table 1

[T(Z)]COLR Factors for ROS1 Height (ft) 150 MWD/MTU 1000 MWD/MTU 2000 MWD/MTU 3000 MWD/MTU 4000 MWD/MTU 5000 MWD/MTU 6000 MWD/MTU 8000 MWD/MTU 10000 MWD/MTU 12000 MWD/MTU 14000 MWD/MTU 12.0720 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 11.8708 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 11.6696 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 11.4684 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 11.2672 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 11.0660 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 10.8648 1.0229 1.0080 0.9951 0.9865 0.9827 0.9979 0.9976 1.1102 1.1739 1.2332 1.2551 10.6636 1.0869 1.0768 1.0625 1.0550 1.0564 1.0726 1.0789 1.1849 1.2549 1.3028 1.3122 10.4624 1.1785 1.1639 1.1511 1.1443 1.1488 1.1742 1.1778 1.2705 1.3373 1.3767 1.3803 10.2612 1.2074 1.1973 1.1790 1.1806 1.1892 1.2141 1.2137 1.2958 1.3492 1.3761 1.3778 10.0600 1.1753 1.1665 1.1603 1.1589 1.1706 1.1970 1.1912 1.2571 1.2953 1.3138 1.3157 9.8588 1.1927 1.1955 1.1930 1.1892 1.1996 1.2219 1.2180 1.2584 1.2782 1.2884 1.2899 9.6576 1.2613 1.2716 1.2709 1.2582 1.2737 1.2835 1.2849 1.3035 1.3033 1.3047 1.3115 9.4564 1.2688 1.2832 1.2855 1.2731 1.2848 1.2936 1.2979 1.2923 1.2981 1.2879 1.3008 9.2552 1.2219 1.2381 1.2454 1.2265 1.2376 1.2539 1.2546 1.2486 1.2559 1.2405 1.2555 9.0540 1.2017 1.2139 1.2242 1.2100 1.2165 1.2323 1.2303 1.2310 1.2308 1.2149 1.2256 8.8528 1.2672 1.2837 1.2984 1.2828 1.2827 1.3005 1.2886 1.3010 1.2787 1.2569 1.2695 8.6516 1.3197 1.3388 1.3538 1.3329 1.3356 1.3529 1.3309 1.3464 1.3120 1.2880 1.2954 8.4504 1.3054 1.3245 1.3410 1.3180 1.3240 1.3391 1.3214 1.3289 1.2942 1.2727 1.2776 8.2492 1.2645 1.2835 1.3011 1.2813 1.2868 1.3002 1.2858 1.2856 1.2548 1.2335 1.2421 8.0480 1.3221 1.3404 1.3586 1.3390 1.3424 1.3531 1.3392 1.3318 1.2993 1.2741 1.2825 7.8468 1.3717 1.3890 1.4075 1.3885 1.3897 1.3974 1.3839 1.3676 1.3339 1.3056 1.3141 7.6456 1.3467 1.3628 1.3818 1.3663 1.3666 1.3724 1.3612 1.3399 1.3093 1.2816 1.2920 7.4444 1.2863 1.3011 1.3204 1.3092 1.3093 1.3138 1.3053 1.2814 1.2559 1.2309 1.2439 7.2432 1.3052 1.3184 1.3378 1.3289 1.3272 1.3291 1.3214 1.2910 1.2663 1.2401 1.2535 7.0420 1.3678 1.3786 1.3966 1.3907 1.3862 1.3846 1.3748 1.3354 1.3096 1.2802 1.2926 6.8408 1.3766 1.3875 1.3999 1.4000 1.3940 1.3899 1.3779 1.3332 1.3092 1.2796 1.2921 6.6396 1.3160 1.3278 1.3382 1.3425 1.3367 1.3320 1.3198 1.2749 1.2560 1.2295 1.2435 6.4384 1.2953 1.3074 1.3185 1.3229 1.3164 1.3100 1.2966 1.2510 1.2331 1.2079 1.2219 6.2372 1.3528 1.3646 1.3755 1.3785 1.3692 1.3594 1.3424 1.2950 1.2708 1.2432 1.2547 6.0360 1.3540 1.3664 1.3775 1.3801 1.3698 1.3577 1.3392 1.2935 1.2658 1.2383 1.2486 5.8348 1.3007 1.3034 1.3155 1.3190 1.3092 1.2973 1.2793 1.2402 1.2127 1.1911 1.1984 5.6336 1.2590 1.2528 1.2658 1.2701 1.2635 1.2487 1.2336 1.1983 1.1676 1.1580 1.1613 5.4324 1.3144 1.3054 1.3214 1.3251 1.3173 1.3003 1.2819 1.2377 1.2103 1.2042 1.2032 5.2312 1.3500 1.3435 1.3577 1.3600 1.3512 1.3364 1.3142 1.2744 1.2421 1.2350 1.2300 5.0300 1.3391 1.3362 1.3503 1.3518 1.3435 1.3343 1.3128 1.2738 1.2403 1.2343 1.2266 4.8288 1.3269 1.3309 1.3444 1.3461 1.3384 1.3306 1.3096 1.2730 1.2382 1.2330 1.2238 4.6276 1.3272 1.3366 1.3478 1.3499 1.3428 1.3388 1.3182 1.2833 1.2466 1.2414 1.2291 4.4264 1.3343 1.3506 1.3615 1.3635 1.3575 1.3533 1.3331 1.2999 1.2608 1.2554 1.2405 4.2252 1.3150 1.3369 1.3509 1.3530 1.3480 1.3426 1.3238 1.2942 1.2555 1.2499 1.2337 4.0240 1.2561 1.2772 1.2936 1.2964 1.2936 1.2893 1.2731 1.2503 1.2177 1.2111 1.1953 3.8228 1.2614 1.2766 1.2948 1.2971 1.2953 1.2921 1.2769 1.2570 1.2288 1.2174 1.2021 3.6216 1.3214 1.3304 1.3495 1.3504 1.3487 1.3480 1.3329 1.3105 1.2829 1.2648 1.2524 3.4204 1.3354 1.3395 1.3585 1.3594 1.3587 1.3614 1.3481 1.3291 1.3019 1.2808 1.2726 3.2192 1.3207 1.3220 1.3393 1.3395 1.3402 1.3474 1.3373 1.3257 1.3002 1.2788 1.2746 3.0180 1.3175 1.3193 1.3328 1.3352 1.3378 1.3426 1.3366 1.3287 1.3059 1.2884 1.2836 2.8168 1.3281 1.3338 1.3438 1.3445 1.3517 1.3483 1.3533 1.3529 1.3362 1.3241 1.3166 2.6156 1.3442 1.3563 1.3634 1.3573 1.3715 1.3653 1.3796 1.3833 1.3755 1.3657 1.3594 2.4144 1.3230 1.3366 1.3409 1.3291 1.3508 1.3483 1.3660 1.3770 1.3795 1.3738 1.3710 2.2132 1.2678 1.2793 1.2809 1.2670 1.2929 1.2935 1.3161 1.3368 1.3558 1.3567 1.3603 2.0120 1.2956 1.3042 1.3013 1.2853 1.3128 1.3151 1.3420 1.3692 1.3909 1.3964 1.4054 1.8108 1.3408 1.3458 1.3376 1.3184 1.3471 1.3505 1.3814 1.4146 1.4449 1.4553 1.4699 1.6096 1.3181 1.3191 1.3062 1.2854 1.3146 1.3200 1.3544 1.3947 1.4354 1.4541 1.4786 1.4084 1.2709 1.2673 1.2498 1.2274 1.2561 1.2629 1.2996 1.3471 1.3954 1.4227 1.4576 1.2072 1.2329 1.2242 1.2012 1.1767 1.2041 1.2116 1.2499 1.3035 1.3591 1.3958 1.4426 1.0060 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.8048 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.6036 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.4024 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.2012 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000

COLR FOR SEQUOYAH UNIT 1 CYCLE 28 Unit 1 Cycle 28 SEQUOYAH Page 13 of 16 Revision 0 Table 2

[T(Z)]COLR Factors for ROS2 Height (ft) 150 MWD/MTU 1000 MWD/MTU 2000 MWD/MTU 3000 MWD/MTU 4000 MWD/MTU 5000 MWD/MTU 6000 MWD/MTU 8000 MWD/MTU 10000 MWD/MTU 12000 MWD/MTU 14000 MWD/MTU 12.0720 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 11.8708 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 11.6696 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 11.4684 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 11.2672 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 11.0660 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 10.8648 1.0125 1.0044 0.9914 0.9859 0.9823 1.0059 0.9977 1.1058 1.1464 1.2394 1.2573 10.6636 1.0868 1.0692 1.0585 1.0545 1.0560 1.0807 1.0789 1.1805 1.2259 1.3092 1.3140 10.4624 1.1785 1.1640 1.1468 1.1437 1.1488 1.1741 1.1778 1.2660 1.3065 1.3833 1.3803 10.2612 1.2072 1.1972 1.1791 1.1806 1.1892 1.2141 1.2137 1.2914 1.3184 1.3826 1.3746 10.0600 1.1751 1.1665 1.1603 1.1589 1.1707 1.1970 1.1912 1.2529 1.2660 1.3199 1.3099 9.8588 1.1924 1.1955 1.1930 1.1892 1.1996 1.2219 1.2180 1.2541 1.2527 1.2944 1.2892 9.6576 1.2609 1.2716 1.2709 1.2582 1.2737 1.2835 1.2849 1.2987 1.2989 1.3074 1.3116 9.4564 1.2685 1.2832 1.2855 1.2731 1.2848 1.2936 1.2979 1.2911 1.2981 1.2876 1.3007 9.2552 1.2171 1.2381 1.2454 1.2265 1.2376 1.2539 1.2546 1.2461 1.2559 1.2388 1.2555 9.0540 1.1928 1.2139 1.2242 1.2099 1.2164 1.2317 1.2303 1.2313 1.2308 1.2137 1.2256 8.8528 1.2649 1.2837 1.2984 1.2828 1.2827 1.2952 1.2886 1.3009 1.2787 1.2564 1.2695 8.6516 1.3193 1.3388 1.3538 1.3329 1.3356 1.3433 1.3309 1.3464 1.3120 1.2881 1.2954 8.4504 1.3041 1.3245 1.3410 1.3180 1.3240 1.3270 1.3214 1.3289 1.2910 1.2727 1.2776 8.2492 1.2625 1.2835 1.3011 1.2813 1.2868 1.2858 1.2858 1.2856 1.2462 1.2335 1.2421 8.0480 1.3189 1.3404 1.3586 1.3390 1.3424 1.3357 1.3392 1.3318 1.2855 1.2741 1.2825 7.8468 1.3672 1.3890 1.4075 1.3885 1.3897 1.3773 1.3839 1.3676 1.3154 1.3056 1.3141 7.6456 1.3410 1.3628 1.3818 1.3663 1.3666 1.3510 1.3612 1.3399 1.2876 1.2816 1.2920 7.4444 1.2794 1.3011 1.3204 1.3092 1.3093 1.2919 1.3053 1.2814 1.2320 1.2309 1.2439 7.2432 1.2969 1.3184 1.3378 1.3289 1.3272 1.3057 1.3214 1.2910 1.2396 1.2401 1.2535 7.0420 1.3562 1.3774 1.3965 1.3907 1.3862 1.3613 1.3748 1.3353 1.2793 1.2802 1.2926 6.8408 1.3609 1.3811 1.4001 1.4000 1.3940 1.3697 1.3779 1.3332 1.2793 1.2796 1.2921 6.6396 1.3032 1.3201 1.3359 1.3425 1.3367 1.3158 1.3198 1.2749 1.2286 1.2295 1.2435 6.4384 1.2851 1.3014 1.3167 1.3229 1.3164 1.2974 1.2966 1.2488 1.2107 1.2079 1.2219 6.2372 1.3448 1.3600 1.3740 1.3785 1.3692 1.3498 1.3424 1.2912 1.2532 1.2430 1.2547 6.0360 1.3493 1.3634 1.3765 1.3801 1.3697 1.3518 1.3391 1.2910 1.2540 1.2383 1.2485 5.8348 1.2889 1.3022 1.3150 1.3188 1.3091 1.2952 1.2790 1.2389 1.2067 1.1878 1.1987 5.6336 1.2396 1.2525 1.2655 1.2698 1.2633 1.2486 1.2336 1.1978 1.1695 1.1535 1.1560 5.4324 1.2909 1.3036 1.3191 1.3222 1.3170 1.2999 1.2821 1.2330 1.2033 1.1927 1.1955 5.2312 1.3268 1.3382 1.3519 1.3539 1.3510 1.3323 1.3123 1.2602 1.2301 1.2168 1.2202 5.0300 1.3170 1.3274 1.3402 1.3418 1.3424 1.3240 1.3034 1.2552 1.2247 1.2097 1.2151 4.8288 1.3061 1.3153 1.3270 1.3283 1.3325 1.3157 1.2937 1.2507 1.2201 1.2033 1.2102 4.6276 1.3080 1.3158 1.3260 1.3269 1.3344 1.3166 1.2953 1.2548 1.2237 1.2044 1.2123 4.4264 1.3167 1.3230 1.3316 1.3317 1.3426 1.3249 1.3032 1.2664 1.2342 1.2121 1.2203 4.2252 1.2983 1.3033 1.3102 1.3142 1.3249 1.3085 1.2873 1.2567 1.2262 1.2015 1.2105 4.0240 1.2349 1.2388 1.2459 1.2585 1.2642 1.2507 1.2326 1.2101 1.1873 1.1635 1.1702 3.8228 1.2298 1.2341 1.2416 1.2575 1.2583 1.2462 1.2334 1.2128 1.1949 1.1733 1.1718 3.6216 1.2775 1.2849 1.2896 1.3075 1.3049 1.2918 1.2825 1.2602 1.2443 1.2220 1.2119 3.4204 1.2809 1.2917 1.2937 1.3135 1.3116 1.2997 1.2923 1.2726 1.2595 1.2389 1.2227 3.2192 1.2581 1.2712 1.2734 1.2922 1.2925 1.2827 1.2781 1.2657 1.2552 1.2379 1.2165 3.0180 1.2525 1.2641 1.2679 1.2824 1.2826 1.2775 1.2751 1.2652 1.2538 1.2401 1.2183 2.8168 1.2655 1.2753 1.2778 1.2896 1.2898 1.2892 1.2892 1.2808 1.2754 1.2640 1.2476 2.6156 1.2869 1.2964 1.2948 1.3054 1.3067 1.3090 1.3119 1.3078 1.3074 1.2992 1.2881 2.4144 1.2676 1.2773 1.2727 1.2818 1.2844 1.2897 1.2961 1.2993 1.3054 1.3037 1.2983 2.2132 1.2127 1.2226 1.2153 1.2228 1.2272 1.2354 1.2458 1.2580 1.2728 1.2852 1.2872 2.0120 1.2366 1.2466 1.2344 1.2390 1.2438 1.2526 1.2661 1.2866 1.3084 1.3219 1.3280 1.8108 1.2772 1.2865 1.2687 1.2696 1.2742 1.2831 1.2993 1.3273 1.3560 1.3772 1.3874 1.6096 1.2526 1.2614 1.2391 1.2368 1.2417 1.2507 1.2698 1.3075 1.3453 1.3758 1.3934 1.4084 1.2049 1.2123 1.1859 1.1801 1.1849 1.1932 1.2144 1.2605 1.3066 1.3460 1.3716 1.2072 1.1660 1.1714 1.1402 1.1305 1.1345 1.1415 1.1642 1.2178 1.2721 1.3204 1.3551 1.0060 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.8048 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.6036 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.4024 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.2012 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000

COLR FOR SEQUOYAH UNIT 1 CYCLE 28 Unit 1 Cycle 28 SEQUOYAH Page 14 of 16 Revision 0 Table 3 Rj Margin Decrease Factors for ROS1 Cycle Burnup RJ Cycle Burnup RJ Cycle Burnup RJ (MWD/MTU)

(MWD/MTU)

(MWD/MTU) 150 1.0040 6025 1.0119 11900 1.0011 340 1.0081 6214 1.0129 12089 1.0019 529 1.0115 6404 1.0140 12279 1.0027 719 1.0139 6593 1.0152 12468 1.0036 908 1.0151 6783 1.0164 12658 1.0042 1098 1.0142 6972 1.0164 12847 1.0048 1287 1.0125 7162 1.0192 13037 1.0054 1477 1.0109 7352 1.0188 13226 1.0060 1666 1.0097 7541 1.0198 13416 1.0062 1856 1.0108 7731 1.0192 13605 1.0059 2045 1.0169 7920 1.0185 13795 1.0057 2235 1.0177 8110 1.0177 13984 1.0056 2424 1.0174 8299 1.0168 14174 1.0057 2614 1.0195 8489 1.0157 14363 1.0057 2803 1.0176 8678 1.0145 14553 1.0058 2993 1.0151 8868 1.0132 14743 1.0057 3182 1.0127 9057 1.0102 14932 1.0057 3372 1.0104 9247 1.0088 15122 1.0056 3561 1.0043 9436 1.0073 15311 1.0054 3751 1.0025 9626 1.0058 15501 1.0052 3940 1.0013 9815 1.0044 15690 1.0050 4130 1.0047 10005 1.0032 15880 1.0048 4319 1.0058 10194 1.0022 16069 1.0045 4509 1.0111 10384 1.0014 16259 1.0043 4698 1.0126 10573 1.0007 16448 1.0047 4888 1.0135 10763 1.0003 16638 1.0059 5077 1.0140 10952 1.0000 16827 1.0071 5267 1.0141 11142 1.0009 17017 1.0082 5456 1.0148 11331 1.0009 17206 1.0094 5646 1.0104 11521 1.0008 5835 1.0108 11710 1.0008 Values may be interpolated to the surveillance cycle burnup.

COLR FOR SEQUOYAH UNIT 1 CYCLE 28 Unit 1 Cycle 28 SEQUOYAH Page 15 of 16 Revision 0 Table 4 Rj Margin Decrease Factors for ROS2 Cycle Burnup RJ Cycle Burnup RJ Cycle Burnup RJ (MWD/MTU)

(MWD/MTU)

(MWD/MTU) 150 1.0103 6214 1.0001 11710 1.0014 340 1.0148 6404 1.0021 11900 1.0009 529 1.0186 6593 1.0040 12089 1.0005 719 1.0215 6783 1.0058 12279 1.0002 908 1.0232 6972 1.0076 12468 1.0001 1098 1.0220 7162 1.0109 12658 1.0000 1287 1.0210 7352 1.0125 12847 1.0000 1477 1.0191 7541 1.0147 13037 1.0002 1666 1.0163 7731 1.0176 13226 1.0007 1856 1.0160 7920 1.0178 13416 1.0013 2045 1.0153 8110 1.0173 13605 1.0019 2235 1.0128 8299 1.0168 13795 1.0021 2424 1.0097 8489 1.0161 13984 1.0026 2614 1.0077 8678 1.0154 14174 1.0027 2803 1.0048 8868 1.0146 14363 1.0028 2993 1.0025 9057 1.0130 14932 1.0028 3182 1.0012 9247 1.0121 15122 1.0027 3372 1.0009 9436 1.0112 15311 1.0025 3561 1.0000 9626 1.0107 15501 1.0023 4319 1.0000 9815 1.0098 15690 1.0021 4509 1.0020 10005 1.0089 15880 1.0019 4698 1.0041 10194 1.0081 16069 1.0016 4888 1.0056 10384 1.0072 16259 1.0014 5077 1.0064 10573 1.0064 16448 1.0012 5267 1.0066 10763 1.0055 16638 1.0010 5456 1.0061 10952 1.0047 16827 1.0008 5646 1.0004 11142 1.0035 17017 1.0007 5835 1.0000 11331 1.0027 17206 1.0006 6025 1.0000 11521 1.0020 Values may be interpolated to the surveillance cycle burnup.

COLR FOR SEQUOYAH UNIT 1 CYCLE 28 Unit 1 Cycle 28 SEQUOYAH Page 16 of 16 Revision 0 Table 5 Required Thermal Power Limits and AFD Reductions RAOC Operating Space Required FQW(z)

Margin Improvement

(%)

Required THERMAL POWER Limit

(%RTP)

Required AFD Reduction ROS1 6.7 90 See Figure 3, RA-1

>6.7

<50 N/A ROS2 5.2 90 See Figure 3, RA-2

>5.2

<50 N/A