ML22306A219

Core Operating Limits Report - Surry 2 Cycle 31 Pattern Msk Revision 2

ML22306A219
Person / Time
Site:	Surry
Issue date:	11/01/2022
From:	Standley B Dominion Energy Services, Dominion Energy Virginia, Virginia Electric & Power Co (VEPCO)
To:	Office of Nuclear Reactor Regulation, Document Control Desk
References
22-327
Download: ML22306A219 (1)

Text

Dom inion Energy Services, Inc.

5000 Dom inion Bou levard, Glen Allen, VA 23060 ~ Dominion Dominion Energy.com

~ Energy" November 1, 2022 United States Nuclear Regulatory Commission Serial No.: 22-327 Attention: Document Control Desk NRA/GDM: RO Washington, D.C. 20555 Docket No.: 50-281 License No.: DPR-37 VI RG INIA ELECTRIC AND POWER COMPANY (DOMINION ENERGY VI RG INIA)

SURRY POWER STATION UNIT 2 CORE OPERATING LIMITS REPORT SURRY 2 CYCLE 31 PATTERN MSK REVISION 2 Pursuant to Surry Power Station (Surry) Units 1 and 2 Technical Specification (TS) 6.2.C, attached is a copy of the Core Operating Limits Report (COLR) for Surry Unit 2, Cycle 31, Pattern MSK, Revision 2. This COLR revision reflects the replacement of the Best Estimate Large Break LOCA methodology with the Full Spectrum LOCA methodology. The Revision 2 changes are noted by revision bars in the left margin.

If you have any questions or require additional information, please contact Mr. Gary D. Miller at (804) 273-2771.

Respectfully, B. E. Standley, Director Nuclear Regulatory Affairs Dominion Energy Services, Inc. for Virginia Electric and Power Company

Attachment:

Core Operating Limits Report, Surry Unit 2 Cycle 31 Pattern MSK, Revision 2 Commitment Summary: There are no new commitments contained in this letter.

Serial No.22-327 Docket No. 50-281 COLR S2C31R2 Page 2 of 2 cc: U.S. Nuclear Regulatory Commission Region II Marquis One Tower 245 Peachtree Center Avenue, NE Suite 1200 Atlanta, Georgia 30303-1257 Mr. L. John Klos NRC Project Manager - Surry U.S. Nuclear Regulatory Commission One White Flint North, Mail Stop 09 E-3 11555 Rockville Pike Rockville, MD 20852-2738 Mr. G. Edward Miller NRC Senior Project Manager - North Anna U.S. Nuclear Regulatory Commission One White Flint North Mail Stop 09 E-3 11555 Rockville Pike Rockville, MD 20852-2738 NRC Senior Resident Inspector Surry Power Station

Serial No.22-327 Docket No. 50-281 Attachment CORE OPERA TING LIMITS REPORT Surry Unit 2 Cycle 31 Pattern MSK Revision 2 Virginia Electric and Power Company (Dominion Energy Virginia)

Serial No.22-327 Docket No. 50-281 Attachment

1.0 INTRODUCTION

This Core Operating Limits Report (COLR) for Surry Unit 2 Cycle 31 has been prepared in accordance with the requirements of Surry Technical Specification 6.2.C.

The Technical Specifications affected by this report are:

TS 2.1 - Safety Limit, Reactor Core TS 2.3 .A.2.d - Overtemperature 8 T TS 2.3 .A.2.e - Overpower 8 T TS 3.1.E - Moderator Temperature Coefficient TS 3.12.A.1, TS 3.12.A.2, TS 3.12.A.3 and TS 3.12.C.3.b.l(b)- Control Bank Insertion Limits TS 3.12.A.l.a, TS 3.12.A.2.a, TS 3.12.A.3.c and TS 3.12.G-Shutdown Margin TS 3.12.B.1 and TS 3.12.B.2 - Power Distribution Limits (Heat Flux Hot Channel Factor and Nuclear Enthalpy Rise Hot Channel Factor)

TS 3 .12.F - DNB Parameters TS Table 4.1-2A - Minimum Frequency for Equipment Tests: Item 22 - RCS Flow

2.0 REFERENCES

1. VEP-FRD-42, Rev. 2.2-A, "Reload Nuclear Design Methodology," October 2017.

Methodology for:

TS 2.1 - Safety Limit, Reactor Core TS 3 .1.E - Moderator Temperature Coefficient TS 3.12.A.1, TS 3.12.A.2, TS 3.12.A.3 and TS 3.12.C.3.b.l(b)- Control Bank Insertion Limit TS 3.12.A.l.a, TS 3.12.A.2.a, TS 3.12.A.3.c and TS 3.12.G-Shutdown Margin TS 3.12.B.1 and TS 3.12.B.2 - Heat Flux Hot Channel Factor and Nuclear Enthalpy Rise Hot Channel Factor TS 3.12.F -DNB Parameters TS Table 4.1-2A - Minimum Frequency for Equipment Tests: Item 22 - RCS Flow

2. WCAP-16996-P-A, Rev. 1, "Realistic LOCA Evaluation Methodology Applied to the Full Spectrum of Break Sizes (FULL SPECTRUM LOCA Methodology)," November 2016.

Methodology for:

TS 3.12.B.1 and TS 3.12.B.2 - Heat Flux Hot Channel Factor

3. EMF-2328(P)(A), "PWR Small Break LOCA Evaluation Model, S-RELAP5 Based," as supplemented by ANP-3676P, "Surry Fuel-Vendor Independent Small Break LOCA Analysis," as approved by NRC Safety Evaluation Report dated March 19, 2021.

Methodology for:

TS 3.12.B.1 and TS 3.12.B.2 - Heat Flux Hot Channel Factor I COLR-S2C31, Revision 2 Page 1 of 7

Serial No.22-327 Docket No. 50-281 Attachment

4. WCAP-12610-P-A, "VANTAGE+ Fuel Assembly Report," (Westinghouse Proprietary), April 1995.

Methodology for:

TS 3.12.B.1 and TS 3.12.B.2 - Heat Flux Hot Channel Factor

5. WCAP-12610-P-A and CENPD-404-P-A, Addendum 1-A, "Optimized ZIRLO," (Westinghouse Proprietary), July 2006.

Methodology for:

TS 3.12.B.1 and TS 3.12.B.2 - Heat Flux Hot Channel Factor

6. VEP-NE-2-A, Rev. 0, "Statistical DNBR Evaluation Methodology," June 1987.

Methodology for:

TS 3.12.B.1 and TS 3.12.B.2 - Nuclear Enthalpy Rise Hot Channel Factor

7. DOM-NAF-2-P-A, Rev. 0.3, "Reactor Core Thermal-Hydraulics Using the VIPRE-D Computer Code," including Appendix B, "Qualification of the Westinghouse WRB-1 CHF Correlation in the Dominion VIPRE-D Computer Code," and Appendix D, "Qualification of the ABB-NV and WLOP CHF Correlations in the Dominion VIPRE-D Computer Code," September 2014.

Methodology for:

TS 3.12.B.1 and TS 3.12.B.2 - Nuclear Enthalpy Rise Hot Channel Factor

8. WCAP-8745-P-A, "Design Bases for Thermal Overpower Delta-T and Thermal Overtemperature Delta-T Trip Function," September 1986.

Methodology for:

TS 2.3 .A.2.d - Overtemperature ~ T TS 2.3.A.2.e-Overpower ~T I COLR-S2C31, Revision 2 Page 2 of 7

Serial No.22-327 Docket No. 50-281 Attachment 3.0 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 Technical Specification 6.2.C and repeated in Section 2.0.

3.1 Safety Limit. Reactor Core (TS 2.1)

The Reactor Core Safety Limits are presented in Figure A-1.

3.2 Qxertemperature AT (TS 2.3.A.2.d)

Where:

8T is measured RCS 8T, 0 P.

8To is the indicated 8Tat RATED POWER, 0 P.

sis the Laplace transform operator, sec- 1.

T is the measured RCS average temperature (Tavg), 0 P.

T' is the nominal Tavg at RATED POWER, S 573.0°F.

P is the measured pressurizer pressure, psig.

P' is the nominal RCS operating pressure ~ 2235 psig.

K1 S 1.1425 K2 ~ 0.01059 / P K3 ~

0 0.000765 /psig t1 ~ 29.7 seconds tz S 4.4 seconds f(Af) ~ 0.0268 { (qt-qb)}, when (q1 - qb) <-24.0% RATED POWER 0, when -24.0% RATED POWERS (qt-qb) S +8.0% RATED POWER 0.0188 {(qt-qb)- 8.0}, when (q1 - qb) > +8.0% RATED POWER Where q1 and qb are percent RATED POWER in the upper and lower halves of the core, respectively, and qt+ qb is the total THERMAL POWER in percent RATED POWER.

I COLR-S2C31, Revision 2 Page 3 of 7

Serial No.22-327 Docket No. 50-281 Attachment 3.3 Oyerpowert\T (TS 2.3.A.2.e)

Where:

~Tis measured RCS ~T, 0 P.

~To is the indicated ~Tat RATED POWER, 0 P.

sis the Laplace transform operator, sec- 1.

0 T is the measured RCS average temperature (Tavg), P.

T' is the nominal Tavg at RATED POWER, :5 573.0°F.

l<4:51.0965 Ks 2'.: 0.0198 / 0 P for increasing T avg K6 2'.: 0.001074 / 0 P for T > T' 2'.: 0 / 0 P for decreasing T avg 2'.: 0 forTST' t3 2'.: 9.0 seconds f( Af) = as defined above for OT~T 3.4 Moderator Temperature Coefficient (TS 3. l .E)

The Moderator Temperature Coefficient (MTC) limits are:

+6.0 pcmfP at less than 50 percent of RA TED POWER, and

+6.0 pcmfF at 50 percent of RATED POWER and linearly decreasing to OpcmfF at RATED POWER 3.5 Control Bank Insertion Limits (TS 3.12.A.l, TS 3.12.A.2, TS 3.12.A.3, and TS 3.12.C.3.b.l(b))

3.5.1 The control rod banks shall be limited in physical insertion as shown in Figure A-2.

3.5.2 The rod insertion limit for the A and B control banks is the fully withdrawn position as shown on FigureA-2.

3.5.3 The rod insertion limit for the A and B shutdown banks is the fully withdrawn position as shown on FigureA-2.

3.6 Shutdown Margin (TS 3.12.A.l.a, TS 3.12.A.2.a, TS 3.12.A.3.c and TS 3.12.G)

Shutdown margin (SDM) shall be 2'.: 1.77 %&/k.

I COLR-S2C31, Revision 2 Page 4 of 7

Serial No.22-327 Docket No. 50-281 Attachment 3.7 Power Djstrjbution Limits (TS 3.12.B.1 and TS 3.12.B.2) 3.7.1 Heat Flux Hot Channel Factor - FQ(z)

CFQ FQ(z) ~ p K(z)for P > 0.5 CFQ FQ(z) ~ _ K(z)for P ~ 0.5 05 THERMAL POWER where: P = -RATED

- - -POWER---

CFQ=2.5 K(z) = 1.0 for all core heights, z 3.7.2 Nuclear Enthalpy Rise Hot Channel Factor - FMI(N)

FliH(N) ~ CFDH * {1 + PFDH(1 - P)}

THERMAL POWER where: P = -RATED

- - -POWER---

CFDH= 1.635 PFDH=0.3 3.8 DNB Parameters (TS 3.12.F and TS Table 4.1-2A)

Departure from Nucleate Boiling (DNB) Parameters shall be maintained within their limits during POWER OPERATION:

• Reactor Coolant System T avg :S 577.0 °F

• Pressurizer Pressure 2: 2205 psig

• Reactor Coolant System Total Flow Rate 2: 273,000 gpm (Tech Spec Limit) and 2: 274,000 gpm (COLR Limit)

I COLR-S2C31, Revision 2 Page 5 of 7

Serial No.22-327 Docket No. 50-281 Attachment Figure A-1 REACTOR CORE SAFETY LIMITS THREE LOOP OPERATION, 100% FLOW 670 L&.

Ill C1I

...tl.0 C1I 660 650 - ------

238 > osie:

'J'J~ .,. nc;ip-C C1I

.........n, C1I 640 630 r---

r--- ......____ ~ 198 5 psig

-- .........._ ~

~

-- i'--....' ~

--- ~,"'"

J 186 ---

E C1I a.

C1I 620 610

---

- ~

0 psr .....__~

r---..

-- - ~

r--- I'-..'

~"' "

I-C1I tl.0 600 r---... ...

n,

~

C1I 590

<[

"ii 580 ~

Ill Ill C1I 570 560 550 ' '

0 10 20 30 40 so 60 70 80 90 100 110 120 Percent of Rated Power I COLR-S2C31, Revision 2 Page 6 of 7

Serial No.22-327 Docket No. 50-281 Attachment Figure A-2 Surry 2 Cycle 31 The insertion limit for C-Bank is Rod Group Insertion Limits met for C-Bank positions greater than or equal to 225 steps.

Max w/d position = 229 steps 230

/

0.4875, 229 I

220 V

210

/

200

/

190

/

/ c-B, nk 1.0,183

..J

~

180 170

/ /

160

/

'fl"

/ "

"t>

3:

150

/ V

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QI 140 0,151

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c' /

V 0 130 0

0. 120

/

a.

...0 110

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C, "t>

0 100 D-Bank

~

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a:

90

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80

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70

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60

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40

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30

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20

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0,23 10 0

0 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 1 Fraction of Rated Thermal Power I COLR-S2C31, Revision 2 Page 7 of 7