NL-19-0361, Core Operating Limits Report, Cycle 21, Version 1
| ML19112A090 | |
| Person / Time | |
|---|---|
| Site: | 05000426 |
| Issue date: | 04/22/2019 |
| From: | Gayheart C Southern Nuclear Operating Co |
| To: | Document Control Desk, Office of Nuclear Reactor Regulation |
| References | |
| NL-19-0361 | |
| Download: ML19112A090 (16) | |
Text
~ Southern Nuclear APR 2 2 2019 Docket Nos.: 50-426 U.S. Nuclear Regulatory Commission ATTN: Document Control Desk Washington, D. C. 20555-0001 Cheryl A. Gayheart Regulatory Affa1rs Director Vogtle Electric Generating Plant-Unit 2 Core Operating Limits Report. Cycle 21. Version 1 Ladies and Gentlemen:
3535 Colonnade Parkway B1rm1ngham, AL 35243 205 992 5316 tel 205 992 7601 fax cagayhea@ southernco.com NL-19-0361 In accordance with Technical Specification (TS) 5.6.5.d for Vogtle Electric Generating Plant (VEGP), Southern Nuclear Operating Company (SNC) submits the VEGP Core Operating Limits Report (COLR for Unit 2, Cycle 21, Version 1 ).
This letter contains no NRC commitments. If you have any questions, please contact Jamie Coleman at 205.992-6611.
Respectfully submitted, Cheryl.
ayheart Regulatory Affairs Director CAG/kgl/sm
Enclosure:
VEGP Unit 2 COLR, Cycle 21, Version 1 Cc: Regional Administrator NRR Project Manager-Vogtle 1 & 2 Senior Resident Inspector-Vogtle 1 & 2 RType: CVC7000
Vogtle Electric Generating Plant - Unit 2 Core Operating Limits Report, Cycle 21, Version 1 Enclosure VEGP Unit 2 COLR, Cycle 21, Version 1
VOGTLE ELECTRIC GENERATING PLANT (VEGP) UNIT 2 CYCLE 21 CORE OPERATING LIMITS REPORT Version 1 December 2018
CORE OPERATING LIMITS REPORT, VEGP UNIT 2 CYCLE 21 DECEMBER 2018 1.0 CORE OPERATING LIMITS REPORT This Core Operating Limits Report (COLR) for VEGP Unit 2 Cycle 21 has been prepared in accordance with the requirements ofTechnical Specification 5.6.5.
The Technical Requirement affected by this report is listed below:
13.1.1 SHUTDOWN MARGIN - MODES I and 2 The Technical Specifications affected by this report are listed below:
3.l.l 3.1.3 3.1.5 3.1.6 3.2.1 3.2.2 3.2.3 3.9.1 SHUTDOWN MARGIN - MODES 3, 4 and 5 Moderator Temperature Coefficient Shutdown Bank Insertion Limits Control Bank Insertion Limits Heat Flux Hot Channel Factor - Fo(Z)
Nuclear Enthalpy Rise Hot Channnel Factor-FN H Axial Flux Difference Boron Concentration Page 1 of13
CORE OPERA TfNG LIMITS REPORT. VEGP UNIT 2 CYCLE 21 DECEMBER2018 2.0 OPERATrNG 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 NRC-approved methodologies including those specified in Technical Specification 5.6.5.
2.1 SHUTDOWN MARGrN - MODES I and 2 (Technical Requirement 13.1.1) 2.1.1 The SHUTDOWN MARGIN shall be greater than or equal to 1.30 percent ~k/k.
2.2 SHUTDOWN MARGrN - MODES 3. 4 and 5 (Specification 3.1.1) 2.2.1 The SHUTDOWN MARGrN shall be greater than or equal to the limits shown in Figures I and 2.
Page2 of13
CORE OPERATING LIMITS REPORT. VEGP UNIT 2 CYCLE 21 DECEMBER 2018 2.3 Moderator Temperature Coefficient (Specification 3.1.3) 2.3.1 The Moderator Temperature Coefficient (MTC) limits are:
The BOLIARO/HZP-MTC shall be less positive than +0.7 x 10-4 ~k/k/°F for power levels up to 70% RTP with a linear ramp to 0 ~k/k/°F at I 00% RTP.
The EOLIAROIRTP-MTC shall be less negative than -5.50 x 10-4 ~klk/°F.
1 2.3.2 The MTC Surveillance limits are:
The 300 ppm/ARO/RTP-MTC should be less negative than or equal to
-4.75 X 10-4 ~k/k/
0 f.
1 The revised predicted near-EOL 300 ppm MTC shall be calculated using Figure 6 and the following algorithm:
Revised Predicted MTC Correction***
Predicted MTC* + AFD Correction** + Predictive
- where,
- Predicted MTC is calculated from Figure 6 at the bumup corresponding to the measurement of 300 ppm at RTP conditions,
- AFD Correction is the more negative value of:
{0 pcmrF or (~AFD
- AFD Sensitivity)}
where: ~AFD is the measured AFD minus the predicted AFD from an incore flux map taken at or near the bumup corresponding to 300 ppm, AFD Sensitivity= 0.08 pcm/°F I ~AFD
- Predictive Correction is -3 pcm/°F.
The 60 ppm/ARO/RTP-MTC should be less negative than -5.35 x 10-4 ~klk/°F.
1 where: BOL stands for Beginning of Cycle Life ARO stands for All Rods Out HZP stands for Hot Zero THERMAL POWER EOL stands for End of Cycle Life RTP stands for RATED THERMAL POWER 1 Applicable for full-power T-average of 583.8 to 586.8 °F.
Page 3 of13
CORE OPERATING LIMITS REPORT. VEGP UNIT 2 CYCLE 21 DECEMBER 2018 2.4 Shutdown Bank Insertion Limits (Specification 3.1.5) 2.4.1 The shutdown banks shall be withdrawn to a position greater than or equal to 225 steps.
2.5 Control Bank Insertion Limits (Specification 3.1.6) 2.5.1 The control rod banks shall be limited in physical insertion as shown in Figure 3.
2.6 Heat Flux Hot Channel Factor - FQ(Z) (Specification 3.2.1)
F/171' 2.6.1 F0 (Z) ~ __5L_
- K(Z) for P > 0.5 p
FIll/'
F0 (Z) ~ __5L_
- K(Z) for P ~ 0.5
0.5 where
THERMAL POWER p =----------
RATED THERMAL POWER 2.6.2 2.6.3 K(Z) is provided in Figure 4.
2.6.4 F 1111'
- K(Z)
F (Z) <
Q for P > 0.5 Q
- p. W(Z)
FiliP
- K(Z)
F (Z) < (}
for P ~ 0.5 Q
0.5
- W(Z) 2.6.5 W(Z) values are provided in Table 2.
2.6.6 The F0(Z) penalty factors are provided in Table I.
Page4 of13
CORE OPERATING LIMITS REPORT, VEGP UNIT 2 CYCLE 21 DECEMBER 2018 2.7 Nuclear Enthalpy Rise Hot Channel Factor-FN H (Specification 3.2.2) 2.7.1 F~ 5, F~"~' *(1+PFMI *(1 - P))
where:
THERMAL POWER p =----------
RATED THERMAL POWER 2.7.2 F:/,~' = 1.65 2.7.3 Pf'.lll = 0.3 2.8 Axial Flux Difference (Specification 3.2.3) 2.8.1 The Axial Flux Difference (AFD) Acceptable Operation Limits are provided in Figure 5.
2.9 Boron Concentration (Specification 3.9.1) 2.9.1 The boron concentration shall be greater than or equal to 2000 ppm. 2 This concentration bounds the condition of kerr~ 0.95 (all rods in less the most reactive rod) and subcriticality (all rods out) over the entire cycle. This concentration includes additional boron to address uncertainties and B 10 depletion.
Page 5 of13
CORE OPERATING LIMITS REPORT, VEGP UNIT 2 CYCLE 21 DECEMBER2018 Tablet F Q(Z) PENALTY FACTOR Bum up Penalty (MWD/MTU)
Factor 0
1.0298 150 1.0298 367 1.0284 584 1.0216 801 1.0348 1018 1.0426 1235 1.0434 1453 1.0443 1670 1.0452 1887 1.0418 2104 1.0335 2321 1.0259 2538 1.0200 Notes:
- 1. The Penalty Factor, to be applied to FQ(Z) in accordance with SR 3.2.1.2, is the maximum factor by which FQ(Z) is expected to increase over a 39 EFPD interval (surveillance interval of 31 EFPD plus the maximum allowable extension not to exceed 25% of the surveillance interval per SR 3.0.2) starting from the burnup at which the FQ(Z) was determined.
- 2. Linear interpolation is adequate for intermediate cycle burnups.
- 3. For all cycle burnups outside the range of the table, a penalty factor of 1.020 shall be used.
Page 6 of13
CORE OPERATING LIMITS REPORT, VEGP UNIT 2 CYCLE 21 Axial Point 1-3 4
5 6
7 8
9 10 II 12 13 14 15 16 17 18 19 20 21 22 23 H
25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59-61 Elevation (feet) 12.072 - 11.669 11.468 11.261 11.066 10.865 10.664 10.462 10.261 10.060 9.859 9.658 9.456 9.255 9.054 8.853 8.652 8.450 8.249 8.048 7.847 7.646 7.444 7.243 1.042 6.841 6.640 6.438 6.231 6.036 5.835 5.634 5.432 5.231 5.030 4.829 4.628 4.426 4.225 4.024 3.823 3.622 3.420 3.219 3.018 2.817 2.616 2.414 2.213 2.012 1.811 1.610 1.408 1.207 1.006 0.805 0.604 0.402- 0.000 ISO MWD/l\\ITU I 0000 I 3014 I 3186 I 3519 I 3382 I 3291 13323 I 3173 12843 I 2661 I 2837 12771 I 2670 12564 I 2519 I 2487 12477 I 2462 I 2517 I 2544 I 2536 I 2508 I 2447 I 2365 12267 I 2147 I 2014 I 1880 I 1744 I 1597 I 1496 1435 1436 1471 1505 1536 1558 1568 1569 1559 1556 1578 1613 1626 1707 1854 I 2004 I 2154 I 2304 I 2453 I 2595 I 2731 I 2863 I 2988 I 3099 I 3186 I 0000 Table2 RAOCW(Z) 4000 MWD/MTU 0000 3489 3837 4323 4275 4072 3921 3722 3337 3074 2923 2607 2573 2578 I 2538 I 2515 I 2416 I 2323 I 2246 I 2173 I 2144 I 2085 I 1996 I 1887 I 1767 I 1630 I 1481 I 1355 I 1297 I 1236 I 1173 I 1160 I 1180 I 1261 I 1331 I 1399 I 1461 I 1516 I 1564 I 1606 I 1637 I 1679 I 1732 I 1795 I 1987 I 2223 I 2450 I 2684 I 2915 I 3144 I 3361 I 3566 I 3758 13932 I 4082 14198 I 0000 8000 MWD/1\\tTU I 0000 I 2782 I 2964 I 3104 I 3117 12995 I 2848 I 2695 I 2529 I 2347 I 2377 I 2355 I 2348 I 2293 I 2174 I 2089 I 2037 I 1997 I 1960 I 1931 I 1931 I 1907 I 1852 I 1776 I 1689 I 1586 I 1471 I 1346 I 1220 I 1181 I 1155 I 1147 I 1217 I 1308 I 1394 I 1475 I 1551 I 1617 I 1691 I 1772 I 1838 I 1895 I 1941 I 2000 I 2133 I 2337 I 2551 I 2767 12978 I 3185 I 3381 I 3568 I 3742 I 3901 I 4036 I 4134 I 0000 12000 MWD/MTll I 0000 I 2732 I 2785 I 2772 I 2713 I 2559 I 2361 I 2218 I 2035 I 1963 I 1914 I 1851 I 1794 I 1757 I 1695 I 1664 I 1731 I 1795 I 1837 I 1862 I 1867 I 1862 I 1825 I 1768 I 1704 I 1628 I 1568 I 1504 I 1439 I 1367 I 1364 I 1447 I 1540 I 1623 I 1700 I 1766 I 1824 I 1869 I 1907 I 1924 I 1957 I 2006 I 2034 I 2093 I 2186 I 2293 I 2433 I 2582 I 2721 I 2856 I 2988 I 3117 I 3240 I 3357 I 3457 I 3523 I 0000 DECEMBER2018 16000 MWD/MTU I 0000 I 1733 I 1767 I 1761 I 1829 I 1850 I 1834 I 1808 I 1834 I 1823 I 1808 I 1797 I 1819 I 1828 I 1793 I 1771 I 1786 I 1884 I 1981 I 2059 I 2118 I 2165 I 2175 I 2159 I 2132 I 2086 I 2047 I 1999 I 1947 I 1882 I 1835 I 1839 I 1889 I 1935 I 1966 I 1984 I 1987 I 1977 I 1953 I 1924 I 1923 I 1938 I 1935 I 1993 I 2129 I 2266 I 2400 I 2534 I 2653 I 2765 I 2879 I 2991 I 3101 I 3209 I 3303 I 3362 I 0000 20000 MWD/MTU I 0000 I 2077 I 2064 I 2003 I 2058 I 1881 I 1756 I 1754 I 1755 I 1751 I 1742 I 1735 I 1836 I 1981 I 1996 I 2079 I 2220 I 2345 I 2498 I 2622 I 2721 I 2802 I 2832 I 2825 I 2801 I 2753 I 2678 I 2583 I 2479 I 2360 2250 2199 2215 2236 2258 2271 2266 2244 2207 2143 2055 1961 I 1865 I 1847 I 1963 I 2105 I 2242 I 2379 I 2497 I 2609 I 2724 I 2843 I 2961 I 3082 I 3190 I 3260 I 0000 Top and Bottom 3 Points Excluded per Technical Specification 83.2.1.
These W(Z) values are consistent with Figure 5, and are valid over the HFP Tavg temperature range from 583.8 to 586.8°F.
Page 7 of13
CORE OPERATING LIMITS REPORT. VEGP UNIT 2 CYCLE 21 DECEMBER2018 FIGURE 1 REQUIRED SHUTDOWN MARGIN FOR MODES 3 AND 4 (FOUR LOOPS FILLED AND VENTED AND AT LEAST ONE REACTOR COOLANT PUMP RUNNING)
~
~
~
<l dP z
H C!l a
~
1::1
~
til 5.0 4.0 3.0 2.0 1.0 0.0 0
SOD ACCEPTABLE OPERATING REGION (2 00,
.1 0)
/
v v
/
REQUIRED SHUTDOWN MARGIN!
/
/
(1 00,
.2 5) /
/
/
/
/
/
/
/'
!UNACCEPTABLE OPERATING REGION I
( 95 ( '
. 3 0) 1000 1500 2000 2500 RCS BORON CONCENTRATION (ppm)
Page 8 ofl3
CORE OPERATING LIMITS REPORT, VEGP UNIT 2 CYCLE 21 DECEMBER2018 FIGURE2 REQUIRED SHUTDOWN MARGIN FOR MODES 4 AND 5 (MODE 4 WHEN FIGURE 1 NOT APPLICABLE)
~
~
1.1 30 40 50 60 70 POWER (% of Rated Thermal Power) 718. ~~
ll 1(\\
I.I 1.1
/
I 80 90
- Fully withdrawn shall be the condition where control rods are at a position within the interval ~ 225 and ~ 231 steps withdrawn.
j!
)
L6 1 v 1
NOTE: The Rod Bank Insertion Limits are based on the control bank withdrawal sequence A, B, C, D and a control bank tip-to-tip distance of 115 steps.
0 Page 10 of13
CORE OPERATING LIMITS REPORT. VEGP UNIT 2 CYCLE 2 I DECEMBER 20 I 8 PI 0
E-1 u 1.4 1.2 r:: 1. 0
~
~
Po 0. 8
~
l"z1 N
~
~ 0.6 N
to:: 0.4 0.2 0.0 0
FIGURE4 K(Z)- NORMALIZED Fo(Z) AS A FUNCTION OF CORE HEIGHT FQ = 2.50 CORE HT.
K(Z) 0.00 1. 00 6.00 1. 00 12.0.925 2
4 6
8 10 12 CORE HEIGHT (feet)
Page 11 of 13
CORE OPERATING LIMITS REPORT, VEGP UNIT 2 CYCLE 21 DECEMBER 20 18 FIGURE 5 AXIAL FLUX DIFFERENCE LIMITS AS A FUNCTION OF% RATED THERMAL POWER FORRAOC
...... w Gl
~
~
as e Gl
~
E-1
'tl cu
-1..1 Cl Ill:
11-1 0
Ill:
~
0
~
120 110 100 90 80 70 60 50 40 30 20 10 0
-50 u ~AC 'EP~
l ( -30,
-40
(-15, 100)
(+10, 100)
I I
~
ABlE I
\\
UN cc PTJ! BLE I
\\
\\
I
\\
I A "'CE PTAl LE
\\
IJ
\\
I
\\
I
\\
I 1\\
- 50)
I (+26, 50)
I
-30
-20
- 10 0
10 20 30 40 50 AXIAL FLUX DIFFERENCE (percent ~I)
Page 12 of13
CORE OPERATING LIMITS REPORT. VEGP UNIT 2 CYCLE 21 FIGURE 6 PREDICTED HFP 300 PPM MTC VS CYCLE BURNUP
-27.5
~ -28. 0 Ql
- .-I 0
- .-I lj.j lj.j Ql 0
u Ql -28. 5 1-1 B Ill 1-1 Ql
~
Ql E-t -29.0
-29. 5 17 000 Cycle Burnup (MWD/MTU) 17000 18000 19000 20000 21000
....... I'..........
i'-.
....... I'...............
r....
18000 19000 20000 Cycle Burnup (MWD/MTU)
Moderator Temperature Coefficient (pcrn/°F)
-28.00
-28.30
-28.57
-28.86
-29.14 DECEMBER 2018 i'-........
21000 Page 13 of13