WBL-21-052, of the Unit 1 Cycle 18 Core Operating Limits Report (COLR)
| ML21313A261 | |
| Person / Time | |
|---|---|
| Site: | Watts Bar  |
| Issue date: | 11/09/2021 |
| From: | Anthony Williams Tennessee Valley Authority |
| To: | Document Control Desk, Office of Nuclear Reactor Regulation |
| References | |
| WBL-21-052 | |
| Download: ML21313A261 (16) | |
Text
TENNESSEE 1\14 VALLEY AUTHOR ITY Post Office Box 2000, Spring City, Tennessee 37381 WBL-21-052 November 9, 2021 10 CFR 50.4 ATTN : Document Control Desk U. S. Nuclear Regulatory Commission Washington , D.C. 20555-0001 Watts Bar Nuclear Plant, Unit 1 Facility Operating License No. NPF-90 NRC Docket No . 50-390
Subject:
REVISION O OF THE UNIT 1 CYCLE 18 CORE OPERATING LIMITS REPORT (COLR)
Pursuant to Watts Bar Nuclear Plant Technical Specifications Section 5.9.5.d, Tennessee Valley Authority (TVA) has enclosed Revision O of the Unit 1 Cycle 18 COLR. The analytical methods used to determine the core operating limits were previously reviewed and approved by the NRC.
There are no new regulatory commitments contained in this letter or the enclosure . Should you have questions regarding this submittal , please contact Tony Brown , Site Licensing Manager at (423) 365-7720.
RespectfuHy, )
__,,./
L-----*_
Anthony L. Williams , IV Site Vice President Watts Bar Nuclear Plant
U.S. Nuclear Regulatory Commission WBL-21-052 Page 2 November 9, 2021 Enclosure Watts Bar Nuclear Plant, Unit 1, Cycle 18 Core Operating Limits Report, Revision 0, October 2021 cc: (with enclosure)
NRC Regional Administrator - Region II NRC Project Manager - Watt Bar Nuclear Plant NRC Senior Resident Inspector - Watts Bar Nuclear Plant
ENCLOSURE Watts Bar Nuclear Plant, Unit 1, Cycle 18 Core Operating Limits Report Revision 0 October 2021 WBL-21-052 E1 of 14
QA Record L36 211004 805 WATTS BAR NUCLEAR PLANT, UNIT 1, CYCLE 18 CORE OPERATING LIMITS REPORT Revision 0 October 2021 Prepared by:
C Bell, Jamel Dlgll.llly1lgnedbyBel,.L1imelC ON clc"9()V,d<-M,dc-niw,.O\IO'ilrt'IAlr\,ou,,,(orpOn1tf,OU*Users.
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Reasonlmtht1Uthorotthisdorumem Locatloo:COC WFH Oate2021100710:10.Sl-04'00 J. C. Bell, PWR Fuel Engineering Date Verified by:
Wolfram, Gary Digitally signed by Wolfram, Gary Thomas ON: dc=gov, de=tva, dc=maln, ou=Main, ou=Corporate, ou:Users, cn=Wolfram. Gary Thomas, Thomas email=gtwolfram@tva.gov
I --------
Reason: I have reviewed this document Date: 2021.10.07 10:13.47-04'00' G. T. Wolfram, PWR Fuel Engineering Date Reviewed by:
R I* t C h *I e J O h n A Digitally signed by Ritchie, John A DN: dc=gov, dc=tva, dc=main, ou=Main, ou=Corporate, ou=Users, cn=Ritchl@, John A, emai1=jaritchie0@tva.gov
/ Reason: I have reviewed this document
_ _ _ _____o_._=m_2,_,. o_.01_1M =_3*,_-M'_
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- ___ _ _ __ / ________
J.A. Ritchie, PWR Fuel Engineering Manager Date Mack, Bryan Thomas Date: Digitally signed by Mack, Bryan Thomas 2021.10.08 12:?S:18 -04'00' B.T. Mack, Reactor Engineering Manager Date Approved by:
f Date Jen k ns, Beth Ann DN, dc=g . dc=Na , dc=ma ; o. o ,=Ma ; o. o , =Co cpo ca te. o ,= Ums. rn=Jeok; os.
Digitallysi d byJenkins,BethAnn Beth Ann, email=bajenkins@tva.gov
- 1 Reason: I am approving this document
_____________ oa1_e:2_021_ ., o _.2so_s:1_1:J_s-o_,*oo________________
- / _
Plant Manager Date Date of PORC Affected Revision Aooroval PaQes Reason for Revision 0 See Above All Initial Issue Unit 1 Cycle18 WATTS BAR Page 1 of 13 Revision 0 WBL-21-052 E2 of 14
1.0 CORE OPERATING LIMITS REPORT This Core Operating Limits Report (COLR) for Watts Bar Unit 1 Cycle 18 has been prepared in accordance with the requirements of the Technical Specifications 5.9.5.
The Technical Specifications affected by this report are listed below:
3.1.4 Moderator Temperature Coefficient (MTC) 3.1.5 Rod Group Alignment Limits 3.1.6 Shutdown Bank Insertion Limits 3.1.7 Control Bank Insertion Limits 3.2.1 Heat Flux Hot Channel Factor (FQ(Z))
N 3.2.2 Nuclear Enthalpy Rise Hot Channel Factor (F H )
3.2.3 Axial Flux Difference (AFD) 3.9.1 Boron Concentration 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 Section 5.9.5.
The following abbreviations are used in this section:
BOL -- Beginning of Cycle Life ARO -- All Rods Out HZP -- Hot Zero Thermal Power EOL -- End of Cycle Life RTP -- Rated Thermal Power ROS -- RAOC Operating Space RA -- Required Action 2.1 MODERATOR TEMPERATURE COEFFICIENT - MTC (LCO 3.1.4) 2.1.1 The MTC limits are:
The ARO/HZP - MTC shall be less positive than or equal to 0 k/k/ F (upper limit).
With the measured BOL/ARO/HZP - MTC more positive than -1.785 x 10-5 (as-measured MTC limit), establish control rod withdrawal limits to ensure the MTC remains less positive than or equal to 0 k/k/ F (upper limit) for all times in core life.
The EOL/ARO/RTP - MTC shall be less negative than or equal to
-4.5 x 10-4 (lower limit).
2.1.2 The 300 ppm surveillance limit is:
The measured 300 ppm /ARO/RTP-MTC should be less negative than or equal to
-3.75 x 10-4 .
Unit 1 Cycle 18 WATTS BAR Page 2 of 13 Revision 0 WBL-21-052 E3 of 14
2.1.3 The 60 ppm surveillance limit is:
The measured 60 ppm /ARO/RTP-MTC should be less negative than or equal to
-4.28 x 10-4 .
2.2 SHUTDOWN MARGIN - SDM (LCO 3.1.5, 3.1.6, 3.1.7) 2.2.1 k/k in MODE 1 and MODE 2.
2.2.2 k/k in MODE 1 and MODE 2.
2.2.3 k/k 2.3 SHUTDOWN BANK INSERTION LIMITS (LCO 3.1.6) 2.3.1 The shutdown banks shall be withdrawn to a position greater than or equal to 225 steps withdrawn.
2.4 CONTROL BANK INSERTION LIMITS (LCO 3.1.7) 2.4.1 The control banks are fully withdrawn or shall be limited in physical insertion as shown in Figure 1.
2.4.2 Each control bank shall be considered fully withdrawn from the core at greater than or equal to 225 steps.
2.4.3 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.
2.4.4 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 (steps) 225 109 116 226 110 116 227 111 116 228 112 116 229 113 116 230 114 116 231 115 116 Unit 1 Cycle 18 WATTS BAR Page 3 of 13 Revision 0 WBL-21-052 E4 of 14
2.5 HEAT FLUX HOT CHANNEL FACTOR - FQ(Z) (LCO 3.2.1)
FQ(Z) [CFQ / P]
- K(Z) for P > 0.5 FQ(Z) [CFQ / 0.5]
- K(Z) for P 0.5 Where P = Thermal Power / Rated Thermal Power 2.5.1 CFQ = 2.50 2.5.2 K(Z) is provided in Figure 2.
2.5.3 ( ) = 1.03 ( ) 1+
where 1.03 is the fuel manufacturing tolerance,
( ) is the measured value of ( ) and is the measurement uncertainty ( 5).
2.5.4 ( ) equations are:
[ ( )]
( ) 1.03 ( ) ( ) 1+ > 0.5
[ ( )]
( ) 1.03 ( ) ( ) 1+ 0.5 Where ( ) is the measured planar radial peaking factor.
( ) evaluations are not applicable for axial core regions, measured in percent of core height:
- b. Upper core region, from 90 to 1 banks.
2.5.5 [ ( )] values are provided in Tables A.1 and A.2 for ROS 1 and ROS 2, respectively.
2.5.6 ( ) factors adjust the surveillance to the reference conditions assumed in generating the [ ( )] factors. ( ) may be assumed to be equal to 1.0 or may be determined for specific surveillance conditions using the approved methods listed in TS 5.9.5.
2.5.7 The penalty factors account for the potential decrease in transient F Q margin between surveillances. The factors for ROS 1 and ROS 2 are provided in Tables A.3 and A.4 respectively.
2.5.8 Table A.5 provides the required limits on THERMAL POWER and the required AFD reductions for each ROS in the event that additional margin is required.
Unit 1 Cycle 18 WATTS BAR Page 4 of 13 Revision 0 WBL-21-052 E5 of 14
N 2.6 NUCLEAR ENTHALPY RISE HOT CHANNEL FACTOR - F H (LCO 3.2.2)
N RTP F H F H * ( 1 + PF * ( 1-P))
where P = Thermal Power / Rated Thermal Power RTP F H = 1.65 for RFA-2 fuel, and PF = 0.3 2.7 AXIAL FLUX DIFFERENCE - AFD (LCO 3.2.3) 2.7.1 The AFD limits for RAOC operating spaces (ROS 1 and ROS 2) and corresponding AFD reduction limits (RA-1 and RA-2) are provided in Figure 3.
2.8 REFUELING BORON CONCENTRATION (LCO 3.9.1) 2.8.1 The refueling boron concentration shall be 2300 ppm.
3.0 NUMBER OF TPBARS IN REACTOR CORE (TS 4.2.1) 3.0.1 There are 1792 tritium producing burnable absorber rods (TPBARs) in the reactor core for Cycle 18.
Unit 1 Cycle 18 WATTS BAR Page 5 of 13 Revision 0 WBL-21-052 E6 of 14
250 BANK A (ALL POWERS, 225) 225 (0.197, 225) (0.703, 225) 200 BANK B (1.0, 177)
ROD BANK STEP POSITION (STEPS WITHDRAWN) 175 (0.0, 180) 150 BANK C 125 100 BANK D 75 (0.0, 64) 50 25 (0.227, 0) 0 0.0 0.2 0.4 0.6 0.8 1.0 FRACTION OF RATED THERMAL POWER Figure 1 Control Bank Insertion Limits Versus Thermal Power Four Loop Operation Note: Fully withdrawn region shall be the condition where shutdown and control banks are at a position within the interval of 225 and 231 steps withdrawn.
Unit 1 Cycle 18 WATTS BAR Page 6 of 13 Revision 0 WBL-21-052 E7 of 14
1.2 1.1 1
0.9 0.8 Normalized FQ
- Power 0.7 0.6 Core Height K(Z) 0.000 1.000 6.000 1.000 0.5 12.000 1.000 0.4 0.3 0.2 0.1 0
0 1 2 3 4 5 6 7 8 9 10 11 12 Core Height (feet)
Figure 2 K(Z) - Normalized FQ(Z) as a Function of Core Height Unit 1 Cycle 18 WATTS BAR Page 7 of 13 Revision 0 WBL-21-052 E8 of 14
Figure 3 Axial Flux Difference Acceptable Operation Limits as a function of Rated Thermal Power (RAOC)
Unit 1 Cycle 18 WATTS BAR Page 8 of 13 Revision 0 WBL-21-052 E9 of 14
Table A.1
[ ( )] Factors for ROS 1 Height (ft) 150 MWD/MTU 3000 MWD/MTU 8000 MWD/MTU 12000 MWD/MTU 14000 MWD/MTU 16000 MWD/MTU 12.0720 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 11.6696 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 11.2672 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 10.8648 0.9698 0.9097 0.9554 1.0244 1.0980 1.1189 10.6636 1.0360 0.9842 1.0399 1.1049 1.1758 1.1881 10.4624 1.1394 1.0921 1.1519 1.2129 1.2810 1.2803 10.2612 1.1704 1.1343 1.1926 1.2455 1.2939 1.2980 10.0600 1.1272 1.1067 1.1607 1.2042 1.2316 1.2466 9.8588 1.1477 1.1389 1.1834 1.2238 1.2342 1.2490 9.6576 1.2327 1.2307 1.2762 1.2972 1.2980 1.3055 9.4564 1.2487 1.2510 1.2978 1.3067 1.3101 1.3039 9.2552 1.1994 1.1995 1.2435 1.2490 1.2516 1.2427 9.0540 1.1787 1.1795 1.2193 1.2194 1.2206 1.2130 8.8528 1.2622 1.2671 1.2947 1.2880 1.2866 1.2768 8.6516 1.3204 1.3276 1.3495 1.3341 1.3300 1.3178 8.4504 1.2928 1.3058 1.3278 1.3068 1.3049 1.2950 8.2492 1.2350 1.2564 1.2774 1.2514 1.2514 1.2445 8.0480 1.3041 1.3293 1.3367 1.3013 1.2996 1.2914 7.8468 1.3649 1.3946 1.3873 1.3409 1.3382 1.3283 7.6456 1.3333 1.3693 1.3555 1.3065 1.3050 1.2960 7.4444 1.2590 1.3008 1.2847 1.2376 1.2378 1.2310 7.2432 1.2862 1.3304 1.3032 1.2494 1.2484 1.2409 7.0420 1.3704 1.4132 1.3687 1.3034 1.2998 1.2901 6.8408 1.3916 1.4330 1.3778 1.3069 1.2986 1.2886 6.6396 1.3252 1.3669 1.3141 1.2470 1.2351 1.2267 6.4384 1.3103 1.3505 1.2939 1.2264 1.2135 1.2003 6.2372 1.3982 1.4316 1.3594 1.2816 1.2644 1.2426 6.0360 1.4172 1.4489 1.3642 1.2841 1.2646 1.2397 5.8348 1.3507 1.3834 1.3015 1.2241 1.2106 1.1868 5.6336 1.3002 1.3337 1.2538 1.1791 1.1737 1.1441 5.4324 1.3774 1.4107 1.3163 1.2318 1.2277 1.1893 5.2312 1.4302 1.4612 1.3617 1.2682 1.2654 1.2241 5.0300 1.4214 1.4516 1.3561 1.2627 1.2618 1.2208 4.8288 1.4122 1.4412 1.3510 1.2590 1.2591 1.2176 4.6276 1.4157 1.4429 1.3572 1.2669 1.2663 1.2277 4.4264 1.4298 1.4544 1.3730 1.2862 1.2826 1.2450 4.2252 1.4059 1.4289 1.3579 1.2791 1.2733 1.2389 4.0240 1.3213 1.3443 1.2916 1.2277 1.2212 1.1930 3.8228 1.3155 1.3351 1.2925 1.2375 1.2281 1.2034 3.6216 1.3831 1.3986 1.3587 1.3036 1.2878 1.2644 3.4204 1.3924 1.4080 1.3786 1.3312 1.3100 1.2901 3.2192 1.3700 1.3812 1.3681 1.3342 1.3139 1.2966 3.0180 1.3617 1.3612 1.3642 1.3421 1.3254 1.3099 2.8168 1.3676 1.3597 1.3768 1.3666 1.3514 1.3385 2.6156 1.3792 1.3636 1.3996 1.4009 1.3888 1.3790 2.4144 1.3372 1.3187 1.3728 1.3931 1.3879 1.3831 2.2132 1.2480 1.2284 1.3013 1.3424 1.3460 1.3559 2.0120 1.2606 1.2331 1.3220 1.3818 1.3924 1.4002 1.8108 1.2940 1.2563 1.3595 1.4377 1.4555 1.4690 1.6096 1.2426 1.1993 1.3153 1.4135 1.4410 1.4631 1.4084 1.1616 1.1140 1.2377 1.3517 1.3883 1.4191 1.2072 1.0950 1.0411 1.1692 1.2978 1.3436 1.3835 1.0060 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 0.6036 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 0.2012 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 Unit 1 Cycle 18 WATTS BAR Page 9 of 13 Revision 0 WBL-21-052 E10 of 14
Table A.2
[ ( )] Factors for ROS 2 Height (ft) 150 MWD/MTU 3000 MWD/MTU 8000 MWD/MTU 12000 MWD/MTU 14000 MWD/MTU 16000 MWD/MTU 12.0720 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 11.6696 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 11.2672 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 10.8648 0.9566 0.9097 0.9554 1.0244 1.0787 1.0847 10.6636 1.0278 0.9842 1.0399 1.1049 1.1526 1.1524 10.4624 1.1363 1.0922 1.1519 1.2129 1.2507 1.2433 10.2612 1.1705 1.1337 1.1926 1.2455 1.2748 1.2623 10.0600 1.1272 1.1020 1.1607 1.2042 1.2287 1.2144 9.8588 1.1477 1.1285 1.1834 1.2238 1.2342 1.2238 9.6576 1.2327 1.2186 1.2762 1.2972 1.2980 1.2857 9.4564 1.2448 1.2396 1.2978 1.3067 1.3101 1.2849 9.2552 1.1895 1.1939 1.2435 1.2490 1.2516 1.2357 9.0540 1.1637 1.1800 1.2194 1.2187 1.2206 1.2135 8.8528 1.2417 1.2670 1.2931 1.2816 1.2866 1.2766 8.6516 1.2948 1.3276 1.3452 1.3264 1.3300 1.3178 8.4504 1.2685 1.3057 1.3235 1.3022 1.3049 1.2950 8.2492 1.2167 1.2564 1.2719 1.2485 1.2514 1.2445 8.0480 1.2860 1.3255 1.3294 1.2997 1.2994 1.2914 7.8468 1.3474 1.3863 1.3781 1.3402 1.3371 1.3283 7.6456 1.3176 1.3577 1.3448 1.3064 1.3028 1.2960 7.4444 1.2456 1.2867 1.2729 1.2376 1.2349 1.2310 7.2432 1.2735 1.3147 1.2894 1.2494 1.2447 1.2409 7.0420 1.3586 1.3977 1.3526 1.3034 1.2954 1.2901 6.8408 1.3808 1.4193 1.3560 1.3069 1.2935 1.2886 6.6396 1.3165 1.3560 1.2959 1.2470 1.2322 1.2267 6.4384 1.3035 1.3423 1.2794 1.2264 1.2111 1.2003 6.2372 1.3929 1.4301 1.3491 1.2816 1.2623 1.2429 6.0360 1.4132 1.4490 1.3604 1.2841 1.2633 1.2370 5.8348 1.3476 1.3834 1.3002 1.2241 1.2051 1.1848 5.6336 1.2966 1.3314 1.2533 1.1791 1.1574 1.1433 5.4324 1.3702 1.4009 1.3143 1.2317 1.2041 1.1891 5.2312 1.4172 1.4442 1.3543 1.2672 1.2377 1.2206 5.0300 1.4035 1.4294 1.3439 1.2593 1.2300 1.2129 4.8288 1.3876 1.4126 1.3340 1.2526 1.2237 1.2064 4.6276 1.3879 1.4111 1.3352 1.2562 1.2272 1.2092 4.4264 1.3968 1.4176 1.3459 1.2691 1.2397 1.2205 4.2252 1.3688 1.3884 1.3264 1.2561 1.2279 1.2089 4.0240 1.2821 1.3023 1.2573 1.1999 1.1755 1.1587 3.8228 1.2724 1.2892 1.2541 1.2033 1.1801 1.1632 3.6216 1.3311 1.3480 1.3103 1.2603 1.2357 1.2165 3.4204 1.3357 1.3544 1.3238 1.2783 1.2548 1.2374 3.2192 1.3125 1.3261 1.3100 1.2743 1.2544 1.2385 3.0180 1.3002 1.3025 1.3025 1.2755 1.2587 1.2444 2.8168 1.3048 1.2995 1.3081 1.2970 1.2818 1.2696 2.6156 1.3132 1.3031 1.3240 1.3269 1.3134 1.3043 2.4144 1.2714 1.2580 1.2962 1.3144 1.3057 1.3016 2.2132 1.1847 1.1697 1.2260 1.2626 1.2608 1.2639 2.0120 1.1951 1.1735 1.2430 1.2959 1.2988 1.3072 1.8108 1.2253 1.1955 1.2757 1.3446 1.3524 1.3664 1.6096 1.1754 1.1412 1.2322 1.3190 1.3345 1.3569 1.4084 1.0979 1.0602 1.1577 1.2590 1.2821 1.3125 1.2072 1.0342 0.9909 1.0922 1.2067 1.2376 1.2766 1.0060 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 0.6036 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 0.2012 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 Unit 1 Cycle 18 WATTS BAR Page 10 of 13 Revision 0 WBL-21-052 E11 of 14
Table A.3 Rj Margin Decrease Factors for ROS 1 Cycle Burnup Rj Cycle Burnup Rj Cycle Burnup Rj (MWD/MTU) (MWD/MTU) (MWD/MTU) 7733 9439 3373 Unit 1 Cycle 18 WATTS BAR Page 11 of 13 Revision 0 WBL-21-052 E12 of 14
Table A.4 Rj Margin Decrease Factors for ROS 2 Cycle Burnup Rj Cycle Burnup Rj Cycle Burnup Rj (MWD/MTU) (MWD/MTU) (MWD/MTU) 7733 9439 3373 Unit 1 Cycle 18 WATTS BAR Page 12 of 13 Revision 0 WBL-21-052 E13 of 14
Table A.5 Required THERMAL POWER Limits and AFD Reductions RAOC Required THERMAL Required FQW(Z) Margin Required AFD Operating POWER Limit Improvement (%) Reduction Space (%RTP)
ROS 1 See Figure 3 RA-N/A ROS 2 See Figure 3 RA-N/A Unit 1 Cycle 18 WATTS BAR Page 13 of 13 Revision 0 WBL-21-052 E14 of 14