L-21-013, of Cycle 4 Core Operating Limits Report: Difference between revisions

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{{Adams
#REDIRECT [[WBL-21-013, of Cycle 4 Core Operating Limits Report]]
| number = ML21077A067
| issue date = 03/18/2021
| title = of Cycle 4 Core Operating Limits Report
| author name = Williams A
| author affiliation = Tennessee Valley Authority
| addressee name =
| addressee affiliation = NRC/Document Control Desk, NRC/NRR
| docket = 05000391
| license number = NPF-096
| contact person =
| case reference number = WBL-21-013
| document type = Fuel Cycle Reload Report, Letter type:L
| page count = 13
}}
 
=Text=
{{#Wiki_filter:l      TENNESSEE VALLEY AUTHORITY Post Office Box 2000, Spring City, Tennessee 37381 WBL-21-013 March 18, 2021 10 CFR 50.4 ATTN: Document Control Desk U. S. Nuclear Regulatory Commission Washington, D.C. 20555-0001 Watts Bar Nuclear Plant, Unit 2 Facility Operating License No. NPF-96 NRC Docket No. 50-391
 
==Subject:==
REVISION 1 OF THE WATTS BAR UNIT 2 CYCLE 4 CORE OPERATING LIMITS REPORT (COLR)
In accordance with Watts Bar Nuclear Plant (WBN) Technical Specifications Section 5.9.5.d, Tennessee Valley Authority (TVA) is submitting Revision 1 of the WBN Unit 2, Cycle 4 Core Operating Limits Report (COLR).
There are no new regulatory commitments contained in this letter or the enclosure. Should you have questions regarding this submittal, please contact Tony Brown, WBN Site Licensing Manager, at (423) 365-7720 .
              . Williams IV Site Vice President Watts Bar Nuclear Plant
 
U.S. Nuclear Regulatory Commission Page2 WBL-21-013 March 18, 2021
 
==Enclosure:==
Watts Bar Nuclear Plant, Unit 2, Cycle 4 Core Operating Limits Report Revision 1 March 2021 cc (Enclosure):
NRC Regional Administrator - Region II NRR Project Manager NRC Senior Resident Inspector
 
ENCLOSURE Watts Bar Nuclear Plant, Unit 2, Cycle 4 Core Operating Limits Report Revision 1 March 2021
 
QA Record L36 210302 800 WATTS BAR NUCLEAR PLANT, UNIT 2, CYCLE 4 CORE OPERATING LIMITS REPORT Revision 1 March 2021 Prepared
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Jamel C. Bell, PWR Fuel Engineering                                                                      Date Verified by:
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Mark D. Porter, PWR Fuel Engineering                                                                      Date Reviewed by:
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John A. Ritchie, Manager, PWR Fuel Engineering                                                            Date Mack, Bryan Thoma, ,i'-Jt\Di.gitally                                                  signed by Mack, Bryan Thomas
                                                                          -*l:>ate: 2021.03.04 11 :4} :28 -05'00' Bryan T. Mack, Manager, Reactor Engineering                                                              Date
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Date of PORC                          Affected Revision        Aooroval                            Paoes            Reason for Revision 0        10/23/2020                              All            Initial issue 1,4,9,10            Updated W(z) values on Table A.1 and removed 1        See Above TableA.3 Unit2                                                                                                                Cycle4 WATTS BAR                                                              Page 1 oflO                                Revision 1
 
1.0  CORE OPERATING LIMITS REPORT This Core Operating Limits Report (COLR) for Watts Bar Unit 2 Cycle 4 has been prepared in accordance with the requirements of the Technical Specifications (TS) 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))
3.2.2  Nuclear Enthalpy Rise Hot Channel Factor (F,mN) 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 l .O 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 Unit2                                                                                        Cycle 4 WATTS BAR                              Page2 of IO                                      Revision I
 
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 Ak/k/°F (upper limit).
With the measured BOL/ARO/HZP- MTC more positive than -2.12 x 10-5 Ak/k/°F (as-measured MTC limit), establish control rod withdrawal limits to ensure the MTC remains less positive than or equal to OAfdk/°F (upper limit) for all times in core life.
The EOL/ARO/RTP - MTC shall be less negative than or equal to
                -4.50 x 104 &/k/°F (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 104 Afc/k/°F.
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 104 &/k/°F.
2.2  SHUTDOWN MARGIN - SDM (LCO 3.1.S, 3.1.6, 3.1.7) 2.2.1 For TS 3. 1.5, SOM shall be?: 1.6% .Afc/k in MODE I and MODE 2.
2.2.2 For TS 3.1.6, SOM shall be?: 1.6% llk/k in MODE 1 and MODE 2.
2.2.3 For TS 3.1.7, SOM shall be?: 1.6% Afc/k in MODE 1 and MODE 2 with kerr?: 1.0.
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.
Unit2                                                                                  Cycle 4 WATTS BAR                              Page 3 ofl0                                  Revision I
 
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 2.S  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 FQw(Z) = FQc(Z)
* W(Z)/P for P > 0.5 FQw(Z) = FQc(Z)
* W(Z)/0.5 for P :5 0.5 where: W(Z) values are provided in Table A. l.
This table provides sufficient information to determine W(Z) versus core height for all cycle burnups.
2.5.4 The W(Z) values provided by Table A.I may be used when the part power surveillance is performed using the fixed incore detector system.
2.5.5 FQw(Z) Penalty Factor The FQW(Z) penalty factor is provided in Table A.2.
Unit2                                                                                  Cycle4 WATTS BAR                                Page 4 of 10                                Revision I
 
2.6  NUCLEAR ENTHALPY RISE HOT CHANNEL FACTOR-FAnN (LCO 3.2.2) where P ::::: Thermal Power / Rated Thermal Power EmRTP = 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 Cycle 4 arc 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.l) 3.0.1 There are 544 tritium producing burnable absorber rods (TPBARs) in the reactor core for Cycle 4.
Unit2                                                                              Cycle 4 WATTS BAR                              Page 5 of 10                            Revision 1
 
200 1175 E
3: 150 t
s.
      ~      125 -------,--
E
      ~
A.
      ~ 100      ---+--
llll':
I i      75  ----+-
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
* FuUy withdrawn region shall be the condition where shutdown and control banks are at a position within the interval of~ 225 and~ 231 steps withdrawn.
Unit2                                                                                Cycle4 WATTS BAR                                Page6 of 10                              Revision I
 
1.2 1.1 1
0.9 0.8 cu
  ! 0.7 A.
  "-c:J
  "'0 0.6                                      Core Height    K(Z)
  -~                                            0.000        1.000 I
  .. 0.5 6.000 12.000 1.000 1.000 0
z 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)
Figure2 K(Z) - Normalized FQ(Z) as a Function of Core Height Unit2                                                                  Cycle4 WATTS BAR                      Page 7 of 10                          Revision l
 
120 110 i <-12. 100) 1 1 (7,    100) I 100 I                  \
I 90 I
Acceptable Operation I '\\
80  LJ Unacceptable Operation r-*** II                              \          I Unacceptable Operation t
    ~                                                                  \
l'
: a. 70 1ii E                                                                    \
(I)
(=. 60 I                                        \
I i
I 0
    ~
0 50 I
I <-28, 50) I                                    I
                                                                            ' \
(21, so) I 40 30 20 10 o
            -50  -40    -30      -20        -10      0        10        20      30      40 Flux Difference (A I) %
Figure3 Axial Flux Difference Acceptable Operation Limits as a function of Rated Thermal Power (RAOC)
Unit2                                                                                        Cycle 4 WATTS BAR                                Page 8 of 10                                    Revision I
 
TableA.1 RAOCW Z) Surveillance Factors Height      150      2000          8000    12000    14000          16000 (Ft)  (MWD/MTU) (MWD/MTU)    <MWD!MTU) (MWD/MTU) (MWD/MTU)    (MWD/MTU) 12.0720    1.0000    1.0000        1.0000    l.0000    l.0000        l.0000 11.8708    l.0000    LOOOO        1.0000    1.0000    1.0000        1.0000 11.6696    l.0000    1.0000        1.0000    1.0000    1.0000        1.0000 11.4684    1.0000    1.0000        1.0000    1.0000    1.0000        1.0000 11.2672    1.0000    1.0000        1.0000    1.0000    1.0000        1.0000 11.0660    1.0000    1.0000        1.0000    1.0000    1.0000        1.0000 10.8648    1.2448    1.2607        1.2818    1.2400    l.2528        1.2621 10.6636    1.2318    1.2401        1.2398    1.2212    1.2258        1.2348 10.4624    1.2230    1.2278        1.2261    1.2082    1.2194        1.2242 10.2612    1.2102    1.2077        1..2134  1.1938    1.2005        1.2116 10JJ600    1.1982    1.1919        1.1974    1.1802    1.1829        1.1949 9.8588    1.1869    1.1775        1.1834    1.1710    1.1759        1.1825 9.6576    1.1854    1.1780        1.1760    1.1676    1.1760        1.1857 9.4564    1.1850    1.1753        1.1731    1.1807    1.1764        1.1877 9.2552    1.1843    1.1738        1.1752    1.1800    1.1756        1.1893 9.0540    1.1820    1.1761        1.1781    1.1816    1.1809        1.1946 8.8528    1.1871    1.1808        1.1795    1.1855    1.1815        1.1956 8.6516    1.1941    1.1818        1.1814    1.1978    1.1833        1.1979 8.4504    1.2016    1.1851        1.1905    1.2133    1.1944        1.2086 8.2492    1.2059    1.1882        1.2036    1.2262    1.2124        1.2272 8.0480    1.2077    1.1913        1.2116    1.2365    1.2273        1.2425 7.8468    1.2145    1.1944        1.2186    1.2443    1.2381        l.2560 7.6456    1.2182    1.1975        1.2221    1.2489    1.2470        1.2651 7.4444    1.2198    1.1988        1.2253    1.2515    1.2538        1.2728 7.2432    1.2192    1..1979      1.2234    1.2509    1.2575        1.2770 7.0420    1.2172    1.1954        1.2213    1.2481    1.2579        1.2775 6.8408    1.2132    1.1916        1.2164    1.2431    1.2574        1.2762 6.6396    l.2070    1.1856        1.2109    1.2364    1.2533        1.2720 6.4384    l.1998    1.1786        1.2033    1.2314    1.2477        1.2673 6.2372    1.1918    1.1768        1.1943    1.2244    1.2402        1.2594 6.0360    1.1827    1.1770        1.1829    1.2151    1.2314        1.2490 5.8348    1.1787    1.1741        1.1707    1.2046    1.2184        1.2364 5.6336    1.1734    1.1714        1.1632    l.1920    1.2060        1.2223 5.4324    1.1705    1.1700        1.1605    1.1785    1.1914        1.2054 5.2312    1.1696    1.1672        1.1587    1.1777    1.1856        1.1946 5.0300    1.1694    1.1635        1.1590    1.1752    1.1840        1.1910 4.8288    1.1692    1.1580        1.1595    1.1726    1.1807        1.1871 4.6276    1.1689    1.1564        1.1605    1.1682    1.1756        1.1822 4.4264    1.1678    1.1561        1.1596    1.1638    1.1705        1.1762 4.2252    1.1649    1.1550        1.1585    1.1585    1.1666        1.1712 4.0240    1.1624    1.1533        1.1565    1.1542    1.1629        1.1661 3.8228    1.1589    l.1514        1.1544    1.1511    1.1582        1.1599 3.6216    1.1580    1.1495        1.1512    1.1509    1.1525        1.1525 3.4204    1.1626    1.1529        1.1515    1.1543    1.1477        1.1465 3.2192    1.1672    1.1578        l.1559    1.1580    1.1478        1.1454 3.0180    1.1766    1.1722        1.1665    1.1606    1.1507        1.1515 2.81.68  1.1963    1.1958        1.1846    1.1727    1.1622        1.1691 2.6156    1.2172    1.2184        1.2056    1.1910    1.1796        1.1881 2.4144    1.2374    1.2422        1.2242    1.2080    1.1956        1.2067 2.2132    1.2578    l.2643        1.2437    1.2254    1.2129        1.2248 2.0120    1.2773    1.2874        1.2627    1.2418    1.2289        1.2420 1.8108    1.2973    1.3082        1.2804    1.2574    1.2434        1.2582 1.6096    1.3143    1.3290        1.2973    1.2715    1.2578        1.2736 1.4084    1.3287    1.3458        1.3130    1.2838    1.2701        1.2877 1.2072    1.3428    1.3601        1.3270    1.2946    1.2812        1.2988 1.0060    1.0000    1.0000        1.0000    1.0000    1.0000        1.0000 0.8048    1.0000    1.0000        1.0000    1.0000    1.0000        1.0000 0.6036    1.0000    1.0000        1.0000    1.0000    1.0000        1.0000 0.4024    1.0000    1.0000        1.0000    1.0000    1.0000        1.0000 0.2012    1.0000    1.0000        1.0000    1.0000    1.0000        1.0000 0.0000    l.0000    1.0000        1.0000    1.0000    1.0000        1.0000 Unit2                                                              Cycle 4 WATTS BAR                      Page9 of 10                      Revision I
 
TableA.2 FQw(z) Penalty Factor Cycle Burnup          F:J' (Z) Penalty (MWD/MTU)                  Factor 8296                    1.0200 8485                    1.0215 8675                    1.0231 8864                    1.0247 9054                    1.0261 9243                    1.0250 9433                    l.0234 9622                    1.0218 9812                    1.0202 10001                  1.0200 Note:
: 1. The Penalty Factor, which is applied to FQw(Z) for compliance with Surveillance Requirement 3.2. l.2, is the maximum factor by which FQw(Z) is expected to increase per 31. Effective Full Power Days (EFPD) starting from the bumup at which the FQ w(Z) was determined. This Penalty Factor is applicable for the set ofW(Z) Surveillance Factors provided in Table A.I.
Unit2                                                                                  Cycle 4 WATTS BAR                                Page 10 of lO                              Revision 1}}

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