ML25352A316

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Core Operating Limits Report for Unit 2 Cycle 26
ML25352A316
Person / Time
Site: Diablo Canyon Pacific Gas & Electric icon.png
Issue date: 12/17/2025
From: Darrell Adams
Pacific Gas & Electric Co
To:
Office of Nuclear Reactor Regulation, Document Control Desk
References
25-089
Download: ML25352A316 (0)
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Text

Pacific Gas and Electric Company~

PG&E Letter DCL-25-089 U.S. Nuclear Regulatory Commission ATTN : Document Control Desk Washington, DC 20555-0001 Docket No. 50-323, OL-DPR-82 Diablo Canyon Power Plant Unit 2 Core Operating Limits Report for Unit 2 Cycle 26

Dear Commissioners and Staff:

Dallas L. Adams Manager, Program Engineering Oiablo Canyon Power Plant Mail code 104/4/401 P.O. Box 56 Avila Beach, CA 93424 805.545.6182 Oallas.Adams@pge.com In accordance with Diablo Canyon Power Plant (DCPP) Technical Specification 5.6.5.d, enclosed is the Core Operating Limits Report (COLR) for DCPP Unit 2, Cycle 26.

PG&E makes no new or revised regulatory commitments (as defined by NEI 99-04) in this letter.

If there are any questions regarding the COLR, please contact me at (805) 545-6182.

Dallas L. Adams kjse/50943 730-12 Enclosure cc:

Diablo Distribution cc/enc:

Mahdi 0. Hayes, NRC Senior Resident Inspector Samson S. Lee, NRC Project Manager John D. Monninger, NRC Region IV Administrator A

member of the STARS Al li ance Date Ca l laway

  • Diablo Canyon
  • Palo Verde
  • Wolf Creek

Enclosure PG&E Letter DCL-25-089 PACIFIC GAS AND ELECTRIC COMPANY NUCLEAR POWER GENERATION DIABLO CANYON POWER PLANT CORE OPERATING LIMITS REPORT UNIT 2 CYCLE 26 EFFECTIVE DATE OCTOBER 23, 2025

PACIFIC GAS AND ELECTRIC COMPANY NUMBER COLR 2 NUCLEAR POWER GENERATION REVISION 16 DIABLO CANYON POWER PLANT PAGE 1 OF 16 CORE OPERATING LIMITS REPORT UNIT TITLE:

COLR for Diablo Canyon Unit 2 2

INFO ONLY EFFECTIVE DATE CLASSIFICATION: QUALITY RELATED COLR_2u2r16.DOC 04B 1029.1516

1.

CORE OPERATING LIMITS REPORT 1.1 This Core Operating Limits Report (COLR) for Diablo Canyon Unit 2 Cycle 26 has been prepared per the requirements of Technical Specification (TS) 5.6.5.

1.2 The Technical Specifications affected by this report are listed below:

3.1.1 - Shutdown Margin (MODE 2 with keff < 1.0, MODES 3, 4, and 5) 3.1.3 - Moderator Temperature Coefficient 3.1.4 - Rod Group Alignment Limits 3.1.5 - Shutdown Bank Insertion Limits 3.1.6 - Control Bank Insertion Limits 3.1.8 - PHYSICS TESTING Exceptions - MODE 2 3.2.1 - Heat Flux Hot Channel Factor - FQ(Z) 3.2.2 - Nuclear Enthalpy Rise Hot Channel Factor -

H N

F 3.2.3 - Axial Flux Difference - (AFD) 3.4.1 - RCS Pressure, Temperature, and Flow Departure from Nucleate Boiling (DNB) Limits 3.9.1 - Boron Concentration

PACIFIC GAS AND ELECTRIC COMPANY NUMBER COLR 2 DIABLO CANYON POWER PLANT REVISION 16 PAGE 2 OF 16 TITLE:

COLR for Diablo Canyon Unit 2 UNIT 2

COLR_2u2r16.DOC 04B 1029.1516

2.

OPERATING LIMITS The cycle-specific parameter limits for the TS listed in Section 1 are presented in the following subsections. These limits have been developed using the NRC-approved methodologies specified in TS 5.6.5.

2.1 Shutdown Margin (SDM) (TS 3.1.1, 3.1.4, 3.1.5, 3.1.6, 3.1.8)

The SDM limit for MODE 1, MODE 2, MODE 3 and MODE 4 is:

2.1.1 The shutdown margin shall be greater than or equal to 1.6% k/k.

2.1.2 In MODES 3 or 4 the shutdown margin with Safety Injection blocked shall be greater than or equal to 1.6% k/k calculated at a temperature of 200°F.

The SDM limit for MODE 5 is:

2.1.3 The shutdown margin shall be greater than or equal to 1.6% k/k. This limit addresses the concerns of NSAL-02-14 (Reference 6.3) and the boron dilution analysis for RCS filled conditions.

In order to address RCS drained conditions for the boron dilution analysis, a minimum boron concentration of 1800 ppm shall be maintained whenever the RCS level is at or below the reactor vessel flange elevation (114 feet).

2.2 Moderator Temperature Coefficient (MTC) (TS 3.1.3)

The MTC limit for MODES 1, 2, and 3 is:

2.2.1 The MTC shall be less negative than -3.9x10-4 k/k/°F for all rods withdrawn, end of cycle life (EOL), RATED THERMAL POWER condition.

2.2.2 The MTC 300 ppm surveillance limit is -3.0x10-4 k/k/°F (all rods withdrawn, RATED THERMAL POWER condition).

2.2.3 The MTC 60 ppm surveillance limit is -3.72x10-4 k/k/°F (all rods withdrawn, RATED THERMAL POWER condition).

2.3 Shutdown Bank Insertion Limits (TS 3.1.5) 2.3.1 Each shutdown bank shall be withdrawn to at least 225 steps.

2.4 Control Bank Insertion Limits (TS 3.1.6) 2.4.1 The control banks shall be limited in physical insertion as shown in Figure 1.

2.4.2 The control banks shall be withdrawn and inserted in the prescribed sequence in accordance with plant operating procedures. For withdrawal, the sequence is control bank A, control bank B, control bank C, and control bank D. The insertion sequence is the reverse of the withdrawal sequence.

2.4.3 A 128 step tip-to-tip relationship between each sequential control bank shall be maintained.

PACIFIC GAS AND ELECTRIC COMPANY NUMBER COLR 2 DIABLO CANYON POWER PLANT REVISION 16 PAGE 3 OF 16 TITLE:

COLR for Diablo Canyon Unit 2 UNIT 2

COLR_2u2r16.DOC 04B 1029.1516 2.5 Heat Flux Hot Channel Factor - FQ(Z) (TS 3.2.1) 2.5.1

( )

( )

Q CFQ F

Z K Z P

for P > 0.5

( )

( )

0.5 Q

CFQ F

Z K Z

for P 0.5 where P

=

POWER THERMAL RATED POWER THERMAL CFQ = 2.58 K(Z) = 1.0 2.5.2 The T(Z) data for Relaxed Axial Offset Control (RAOC) operation are provided in Tables 2A and 2B for RAOC Operating Spaces (ROS) ROS1 and ROS2, respectively, and are sufficient to determine the RAOC T(Z) versus core height for burnups through the end of full power reactivity plus a power coast down of up to 1200 MWD/MTU.

For T(Z) data at a desired burnup not listed in the table, but less than the maximum listed burnup, values at 3 or more burnup steps should be used to interpolate the T(Z) data to the desired burnup with a polynomial type fit that uses the T(Z) data for the nearest three burnup steps.

For T(Z) data at a desired burnup outside of the listed burnup steps, a linear extrapolation of the T(Z) data for the nearest two burnup steps can be used. If data are listed for only 2 burnup steps, a linear fit can be used for both interpolation and extrapolation.

The T(Z) values are generated assuming that they will be used for full power surveillance. When using a flux map instead of the Power Distribution Monitoring System (PDMS) for part power surveillance, the T(Z) values must be increased by the factor 1/P (P > 0.5) or 1/0.5 (P 0.5), where P is the core relative power during the surveillance, to account for the increase in the FQ(Z) limit at reduced power levels.

Rj penalty factors account for the potential decrease in transient FQ margin between surveillances. The Rj factors for ROS1 and ROS2 are provided in Tables 1A and 1B, respectively. These values shall be used to increase

( )

W Q

F Z

per SR 3.2.1.2.

PACIFIC GAS AND ELECTRIC COMPANY NUMBER COLR 2 DIABLO CANYON POWER PLANT REVISION 16 PAGE 4 OF 16 TITLE:

COLR for Diablo Canyon Unit 2 UNIT 2

COLR_2u2r16.DOC 04B 1029.1516 Either ROS1 or ROS2 may be implemented at any time during operation.

If ROS1 is implemented and entering LCO 3.2.1 Condition B for

( )

W Q

F Z not within limits, EITHER take Action B.1.1 and implement ROS2, OR take Action B.2.1 by using Table 3 to determine required THERMAL POWER and AFD limits based on Required

( )

W Q

F Z margin improvement.

If ROS2 is implemented and entering LCO 3.2.1 Condition B for

( )

W Q

F Z not within limits, take Action B.2.1 by using Table 3 to determine required THERMAL POWER and AFD limits based on Required

( )

W Q

F Z margin improvement.

PACIFIC GAS AND ELECTRIC COMPANY NUMBER COLR 2 DIABLO CANYON POWER PLANT REVISION 16 PAGE 5 OF 16 TITLE:

COLR for Diablo Canyon Unit 2 UNIT 2

COLR_2u2r16.DOC 04B 1029.1516 2.5.3 FQ(Z) shall be evaluated to determine if it is within its limits by verifying that

( )

C Q

F Z and

( )

W Q

F Z satisfy the following:

a.

Using the moveable incore detectors to obtain a power distribution map in MODE 1.

b.

Increasing the measured FQ(Z) component of the power distribution map by 3% to account for manufacturing tolerances and further increasing the value by 5% to account for measurement uncertainties.

c.

Satisfying the following relationship:

( )

1.03

( )

1.0+100.0 Q

C M

Q Q

U F

Z F

Z

where 1.03 is the fuel manufacturing tolerance,

( )

M Q

F Z is the measured value of FQ(Z) and Q

U is the measurement uncertainty (

Q U > 5)

( )

W Q

F Z equations are:

( )

( )

1.03

( )

( )

1.0+100.0 COLR Q

W M

Q XY XY U

T Z F

Z A

Z F

Z Rj P

for P > 0.5

( )

( )

1.03

( )

( )

1.0+

0.5 100.0 COLR Q

W M

Q XY XY U

T Z F

Z A

Z F

Z Rj

for P 0.5 where

( )

M XY F

Z is the measured planar radial peaking factor Y() factors adjust the surveillance to the reference conditions assumed in generating the [T(Z)]COLR factors. Y() may be assumed to be equal to 1.0 or may be determined for specific surveillance conditions using the approved methods listed in TS 5.6.5 (COLR).Ref 7.5 Table 3 provides the required limits on THERMAL POWER and the required AFD reductions for each ROS in the event that additional margin is required.

T(Z) and Rj are specified in step 2.5.2.

PACIFIC GAS AND ELECTRIC COMPANY NUMBER COLR 2 DIABLO CANYON POWER PLANT REVISION 16 PAGE 6 OF 16 TITLE:

COLR for Diablo Canyon Unit 2 UNIT 2

COLR_2u2r16.DOC 04B 1029.1516 2.6 Nuclear Enthalpy Rise Hot Channel Factor -

H N

F (TS 3.2.2)

H N

F H

RTP F

  • [1 + PFH * (1-P)]

where:

P

=

POWER THERMAL RATED POWER THERMAL H

N F

= Measured values of H

N F obtained by using the moveable incore detectors to obtain a power distribution map.

H RTP F

= 1.586 (prior to including 4% uncertainty)

PF

= 0.3 = Power Factor Multiplier 2.7 Power Distribution Measurement Uncertainty (TS 3.2.1. and TS 3.2.2):

If the PDMS is OPERABLE, the uncertainty, UFH, to be applied to the Nuclear Enthalpy Rise Hot Channel Factor, H

N F, shall be calculated by the following formula:

1.0 100.0 H

F H U

U

where:

UH = Uncertainty for enthalpy rise as defined in equation (5-19) in Reference 6.1. However, if the uncertainty is less than 4.0, the uncertainty should be set equal to 4.0.

H RTP F

= 1.65 for PDMS (in the above Section 2.6 equation).

If the PDMS is OPERABLE, the uncertainty, UFQ, to be applied to the Heat Flux Hot Channel Factor, FQ(Z), shall be calculated by the following formula:

1.0 100.0 Q

FQ e

U U

U

where:

UQ = Uncertainty for power peaking factor as defined in equation (5-19) in Reference 6.1. However, if the uncertainty is less than 5.0, the uncertainty should be set equal to 5.0.

Ue = Engineering uncertainty factor

= 1.03 If the PDMS is inoperable, the Nuclear Enthalpy Rise Hot Channel Factor, H

N F, shall be calculated as specified in Section 2.6. If the PDMS is inoperable, the Heat Flux Hot Channel Factor, FQ(Z), shall be calculated as specified in Section 2.5.

PACIFIC GAS AND ELECTRIC COMPANY NUMBER COLR 2 DIABLO CANYON POWER PLANT REVISION 16 PAGE 7 OF 16 TITLE:

COLR for Diablo Canyon Unit 2 UNIT 2

COLR_2u2r16.DOC 04B 1029.1516 2.8 Axial Flux Difference (TS 3.2.3) 2.8.1 The AFD Limits are provided in Figures 2 and 3.

2.9 Boron Concentration (TS 3.9.1)

The refueling boron concentration of the Reactor Coolant System, the refueling canal, and the refueling cavity shall be maintained within the more restrictive of the following limits:

2.9.1 A keff of 0.95 or less, with the most reactive control rod assembly completely withdrawn, or 2.9.2 A boron concentration of greater than or equal to 2000 ppm.

2.10 RCS Pressure, Temperature and Flow Departure from Nucleate Boiling (DNB) Limit (TS 3.4.1) 2.10.1 Pressurizer pressure is greater than or equal to 2175 psig.

2.10.2 RCS average temperature is less than or equal to 581.7°F.

2.10.3 RCS total flow rate is greater than or equal to 362,500 gpm.

NOTE: The DNB RCS TAVG limit is based on the slightly lower and bounding value associated with Unit 1 in order to have the same surveillance limits for both Unit 1 and Unit 2.

3.

TABLES 3.1 Table 1A, "Rj Margin Decrease Factors for ROS1" 3.2 Table 1B, "Rj Margin Decrease Factors for ROS2" 3.3 Table 2A, "T(Z) Factors versus Burnup as a Function of Core Height for ROS1" 3.4 Table 2B, "T(Z) Factors versus Burnup as a Function of Core Height for ROS2" 3.5 Table 3, "Required Thermal Power Limits and AFD Reductions"

4.

FIGURES 4.1 Figure 1, "Control Bank Insertion Limits Versus Rated Thermal Power" 4.2 Figure 2, "AFD Limits as a Function of Rated Thermal Power for Normal Operation" 4.3 Figure 3, "AFD Limits as a Function of Rated Thermal Power for FQ Improvement"

5.

RECORDS None

6.

REFERENCES 6.1 NF-PGE-25-051, "Diablo Canyon Power Plant Unit 2 Cycle 26 Final Reload Evaluation and Core Operating Limits Report," July 2025.

6.2 WCAP-12472-P-A, Addendum 4, "BEACON Core Monitoring and Operation Support System, Addendum 4," September 2012 6.3 Westinghouse Nuclear Safety Advisory Letter NSAL-02-14, Revision 2, "Steam Line Break During Mode 3 for Westinghouse NSSS Plants," August 4, 2005

PACIFIC GAS AND ELECTRIC COMPANY NUMBER COLR 2 DIABLO CANYON POWER PLANT REVISION 16 PAGE 8 OF 16 TITLE:

COLR for Diablo Canyon Unit 2 UNIT 2

COLR_2u2r16.DOC 04B 1029.1516

7.

ANALYTICAL METHODS The analytical methods used to determine the core operating limits shall be those previously reviewed and approved by the NRC, specifically those described in the following documents:

7.1 WCAP-10216-P-A, Revision 1A, "Relaxation of Constant Axial Offset Control FQ Surveillance Technical Specification," February 1994.

7.2 WCAP-9272-P-A, "Westinghouse Reload Safety Evaluation Methodology," July 1985.

7.3 WCAP-8385, "Power Distribution Control and Load Following Procedures,"

September 1974. Approved by NRC Safety Evaluation dated January 31, 1978.

7.4 WCAP-16996-P-A, Revision 1,"Realistic LOCA Evaluation Methodology Applied to the Full Spectrum of Break Sizes (FULL SPECTRUM LOCA Methodology),"

November 2016.

7.5 WCAP-17661-P-A, Revision 1, "Improved RAOC and CAOC FQ Surveillance Technical Specifications," February 2019.

7.6 Not used.

7.7 Not used.

7.8 WCAP-8567-P-A, "Improved Thermal Design Procedure," February 1989.

7.9 WCAP-16045-P-A, "Qualification of the Two-Dimensional Transport Code PARAGON," August 2004.

7.10 WCAP-16045-P-A, Addendum 1-A, "Qualification of the NEXUS Nuclear Data Methodology," August 2007.

PACIFIC GAS AND ELECTRIC COMPANY NUMBER COLR 2 DIABLO CANYON POWER PLANT REVISION 16 PAGE 9 OF 16 TITLE:

COLR for Diablo Canyon Unit 2 UNIT 2

COLR_2u2r16.DOC 04B 1029.1516 Table 1A: Rj Margin Decrease Factors for ROS1 Cycle Burnup Rj Penalty Cycle Burnup Rj Penalty Cycle Burnup Rj Penalty (MWD/MTU)

Multiplier (MWD/MTU)

Multiplier (MWD/MTU)

Multiplier 150 1.0068 8333 1.0210 16517 1.0239 355 1.0212 8538 1.0196 16721 1.0248 559 1.0270 8742 1.0182 16926 1.0253 764 1.0313 8947 1.0168 17130 1.0253 968 1.0319 9152 1.0147 17335 1.0248 1173 1.0284 9356 1.0133 17539 1.0238 1377 1.0223 9561 1.0117 17744 1.0223 1582 1.0136 9765 1.0104 17949 1.0202 1787 1.0086 9970 1.0101 18153 1.0197 1991 1.0046 10175 1.0098 18358 1.0203 2196 1.0054 10379 1.0094 18562 1.0209 2400 1.0071 10584 1.0090 18767 1.0214 2605 1.0102 10788 1.0086 18972 1.0218 2810 1.0120 10993 1.0081 19176 1.0222 3014 1.0136 11197 1.0077 19381 1.0226 3219 1.0140 11402 1.0087 19585 1.0230 3423 1.0139 11607 1.0078 3628 1.0146 11811 1.0067 3832 1.0136 12016 1.0057 4037 1.0130 12220 1.0047 4242 1.0112 12425 1.0038 4446 1.0093 12629 1.0031 4651 1.0072 12834 1.0024 4855 1.0056 13039 1.0003 5060 1.0041 13243 1.0000 5265 1.0040 13448 1.0000 5469 1.0069 13652 1.0000 5674 1.0089 13857 1.0000 5878 1.0122 14062 1.0000 6083 1.0150 14266 1.0000 6287 1.0174 14471 1.0000 6492 1.0193 14675 1.0000 6697 1.0207 14880 1.0000 6901 1.0218 15084 1.0000 7106 1.0212 15289 1.0025 7310 1.0231 15494 1.0064 7515 1.0257 15698 1.0104 7720 1.0246 15903 1.0143 7924 1.0234 16107 1.0182 8129 1.0222 16312 1.0221 NOTE: Linear interpolation is adequate for intermediate cycle burnups.

PACIFIC GAS AND ELECTRIC COMPANY NUMBER COLR 2 DIABLO CANYON POWER PLANT REVISION 16 PAGE 10 OF 16 TITLE:

COLR for Diablo Canyon Unit 2 UNIT 2

COLR_2u2r16.DOC 04B 1029.1516 Table 1B: Rj Margin Decrease Factors for ROS2 Cycle Burnup Rj Penalty Cycle Burnup Rj Penalty Cycle Burnup Rj Penalty (MWD/MTU)

Multiplier (MWD/MTU)

Multiplier (MWD/MTU)

Multiplier 150 1.0442 8333 1.0000 16517 1.0000 355 1.0410 8538 1.0025 16721 1.0000 559 1.0372 8742 1.0056 16926 1.0000 764 1.0329 8947 1.0073 17130 1.0000 968 1.0273 9152 1.0064 17335 1.0000 1173 1.0220 9356 1.0080 17539 1.0000 1377 1.0170 9561 1.0063 17744 1.0000 1582 1.0112 9765 1.0047 17949 1.0000 1787 1.0072 9970 1.0034 18153 1.0000 1991 1.0057 10175 1.0027 18358 1.0000 2196 1.0070 10379 1.0030 18562 1.0000 2400 1.0091 10584 1.0034 18767 1.0000 2605 1.0123 10788 1.0040 18972 1.0000 2810 1.0142 10993 1.0047 19176 1.0000 3014 1.0158 11197 1.0082 19381 1.0000 3219 1.0162 11402 1.0087 19585 1.0000 3423 1.0159 11607 1.0093 3628 1.0160 11811 1.0098 3832 1.0147 12016 1.0102 4037 1.0137 12220 1.0105 4242 1.0117 12425 1.0106 4446 1.0096 12629 1.0107 4651 1.0073 12834 1.0106 4855 1.0056 13039 1.0111 5060 1.0041 13243 1.0116 5265 1.0027 13448 1.0172 5469 1.0016 13652 1.0173 5674 1.0003 13857 1.0170 5878 1.0000 14062 1.0163 6083 1.0000 14266 1.0153 6287 1.0000 14471 1.0141 6492 1.0000 14675 1.0125 6697 1.0000 14880 1.0106 6901 1.0000 15084 1.0037 7106 1.0000 15289 1.0022 7310 1.0000 15494 1.0010 7515 1.0000 15698 1.0003 7720 1.0000 15903 1.0000 7924 1.0000 16107 1.0000 8129 1.0000 16312 1.0000 NOTE: Linear interpolation is adequate for intermediate cycle burnups.

PACIFIC GAS AND ELECTRIC COMPANY NUMBER COLR 2 DIABLO CANYON POWER PLANT REVISION 16 PAGE 11 OF 16 TITLE:

COLR for Diablo Canyon Unit 2 UNIT 2

COLR_2u2r16.DOC 04B 1029.1516 Table 2A: T(Z) Factors versus Burnup as a Function of Core Height for ROS1 Burnup (MWD/MTU)

Height (ft) 150 1000 2000 3000 4000 5000 6000 8000 10000 12000 14000 16000 18000

  • 0.0000 0.5491 0.4894 0.4567 0.4211 0.4027 0.3911 0.3885 0.3978 0.4137 0.4056 0.4264 0.4405 0.4821
  • 0.2012 0.5736 0.5143 0.4829 0.4477 0.4301 0.4195 0.4182 0.4311 0.4513 0.4771 0.5027 0.5208 0.5715
  • 0.4024 0.7623 0.6870 0.6478 0.6024 0.5795 0.5654 0.5633 0.5786 0.6024 0.6278 0.6562 0.6737 0.7320
  • 0.6036 1.2453 1.1306 1.0724 1.0019 0.9659 0.9433 0.9390 0.9598 0.9912 1.0225 1.0561 1.0706 1.1473
  • 0.8048 1.3853 1.2759 1.2270 1.1576 1.1247 1.1051 1.1044 1.1340 1.1722 1.2069 1.2411 1.2508 1.3303 1.0060 1.3529 1.2748 1.2505 1.2012 1.1822 1.1734 1.1816 1.2252 1.2722 1.3104 1.3431 1.3461 1.4208 1.2072 1.3790 1.3140 1.3014 1.2603 1.2466 1.2417 1.2522 1.2980 1.3436 1.3774 1.4032 1.3973 1.4641 1.4084 1.3840 1.3332 1.3323 1.3004 1.2920 1.2908 1.3030 1.3490 1.3912 1.4195 1.4376 1.4232 1.4815 1.6096 1.3880 1.3503 1.3599 1.3365 1.3326 1.3342 1.3470 1.3906 1.4277 1.4494 1.4594 1.4370 1.4868 1.8108 1.3786 1.3515 1.3687 1.3527 1.3519 1.3553 1.3676 1.4071 1.4381 1.4535 1.4564 1.4281 1.4700 2.0120 1.3167 1.2996 1.3221 1.3135 1.3157 1.3211 1.3329 1.3681 1.3942 1.4058 1.4047 1.3759 1.4111 2.2132 1.2734 1.2596 1.2870 1.2848 1.2890 1.2955 1.3060 1.3357 1.3603 1.3677 1.3626 1.3346 1.3626 2.4144 1.3035 1.3011 1.3314 1.3332 1.3372 1.3434 1.3515 1.3735 1.3864 1.3875 1.3759 1.3458 1.3650 2.6156 1.3185 1.3264 1.3537 1.3593 1.3633 1.3679 1.3733 1.3890 1.3955 1.3916 1.3753 1.3486 1.3568 2.8168 1.2926 1.3099 1.3320 1.3413 1.3509 1.3523 1.3571 1.3628 1.3648 1.3589 1.3398 1.3242 1.3192 3.0180 1.2718 1.2903 1.3145 1.3296 1.3356 1.3390 1.3511 1.3380 1.3351 1.3250 1.3102 1.2983 1.2833 3.2192 1.2700 1.2889 1.3178 1.3396 1.3382 1.3418 1.3559 1.3368 1.3297 1.3126 1.3053 1.2855 1.2720 3.4204 1.2800 1.3085 1.3365 1.3572 1.3628 1.3642 1.3740 1.3460 1.3359 1.3145 1.3032 1.2847 1.2752 3.6216 1.2636 1.2986 1.3278 1.3471 1.3582 1.3590 1.3626 1.3326 1.3168 1.2954 1.2810 1.2634 1.2625 3.8228 1.2095 1.2470 1.2757 1.2988 1.3112 1.3117 1.3102 1.2812 1.2635 1.2447 1.2298 1.2183 1.2248 4.0240 1.2192 1.2597 1.2890 1.3154 1.3266 1.3253 1.3168 1.2845 1.2610 1.2411 1.2241 1.2186 1.2250 4.2252 1.2724 1.3163 1.3491 1.3757 1.3854 1.3814 1.3651 1.3278 1.2970 1.2743 1.2535 1.2520 1.2581 4.4264 1.2729 1.3187 1.3549 1.3811 1.3902 1.3852 1.3645 1.3258 1.2921 1.2702 1.2496 1.2543 1.2623 4.6276 1.2703 1.3173 1.3560 1.3811 1.3891 1.3827 1.3609 1.3171 1.2801 1.2583 1.2409 1.2469 1.2554 4.8288 1.2672 1.3150 1.3559 1.3798 1.3866 1.3791 1.3567 1.3085 1.2686 1.2469 1.2327 1.2392 1.2476 5.0300 1.2630 1.3114 1.3544 1.3771 1.3830 1.3749 1.3526 1.3015 1.2601 1.2394 1.2292 1.2366 1.2456 5.2312 1.2680 1.3105 1.3551 1.3762 1.3810 1.3721 1.3498 1.2957 1.2525 1.2322 1.2251 1.2326 1.2432 5.4324 1.2629 1.2862 1.3298 1.3496 1.3537 1.3445 1.3232 1.2671 1.2228 1.2032 1.1985 1.2085 1.2191 5.6336 1.2184 1.2452 1.2791 1.2860 1.2862 1.2779 1.2597 1.2224 1.1863 1.1690 1.1731 1.1880 1.2018 5.8348 1.2745 1.3029 1.3378 1.3461 1.3409 1.3313 1.3145 1.2704 1.2325 1.2135 1.2169 1.2308 1.2457 6.0360 1.3377 1.3684 1.4047 1.4104 1.4035 1.3928 1.3759 1.3251 1.2846 1.2636 1.2650 1.2772 1.2924 6.2372 1.3302 1.3627 1.3997 1.4045 1.3978 1.3883 1.3741 1.3224 1.2839 1.2643 1.2659 1.2805 1.2949 6.4384 1.2861 1.3197 1.3571 1.3615 1.3563 1.3493 1.3391 1.2895 1.2556 1.2389 1.2418 1.2635 1.2732 6.6396 1.3164 1.3516 1.3893 1.3919 1.3860 1.3794 1.3709 1.3183 1.2845 1.2671 1.2679 1.2874 1.2971 6.8408 1.3756 1.4092 1.4468 1.4501 1.4402 1.4330 1.4257 1.3688 1.3336 1.3142 1.3114 1.3304 1.3363 7.0420 1.3686 1.3998 1.4368 1.4432 1.4341 1.4268 1.4205 1.3680 1.3324 1.3142 1.3103 1.3290 1.3332 7.2432 1.3137 1.3418 1.3773 1.3869 1.3798 1.3761 1.3705 1.3268 1.2935 1.2786 1.2752 1.2937 1.2980 7.4444 1.3001 1.3261 1.3600 1.3709 1.3657 1.3633 1.3584 1.3206 1.2883 1.2750 1.2706 1.2860 1.2896 7.6456 1.3572 1.3835 1.4162 1.4255 1.4203 1.4177 1.4128 1.3752 1.3412 1.3260 1.3176 1.3267 1.3284 7.8468 1.3856 1.4119 1.4430 1.4501 1.4458 1.4437 1.4401 1.4046 1.3713 1.3558 1.3444 1.3470 1.3480 8.0480 1.3403 1.3670 1.3961 1.4013 1.3998 1.3999 1.4003 1.3711 1.3439 1.3313 1.3199 1.3173 1.3206 8.2492 1.2827 1.3103 1.3372 1.3396 1.3414 1.3436 1.3490 1.3264 1.3049 1.2963 1.2854 1.2789 1.2854 8.4504 1.3172 1.3475 1.3721 1.3680 1.3709 1.3729 1.3827 1.3607 1.3450 1.3364 1.3211 1.3052 1.3108 8.6516 1.3257 1.3533 1.3759 1.3656 1.3693 1.3731 1.3869 1.3670 1.3582 1.3515 1.3366 1.3207 1.3152 8.8528 1.2759 1.2974 1.3195 1.3116 1.3138 1.3236 1.3354 1.3184 1.3219 1.3181 1.3076 1.2974 1.2879 9.0540 1.2178 1.2391 1.2521 1.2537 1.2562 1.2691 1.2723 1.2691 1.2808 1.2763 1.2732 1.2660 1.2594 9.2552 1.2417 1.2592 1.2663 1.2702 1.2726 1.2865 1.2890 1.2906 1.3057 1.2999 1.2984 1.2901 1.2841 9.4564 1.2946 1.3019 1.3109 1.3082 1.3100 1.3246 1.3340 1.3309 1.3489 1.3483 1.3475 1.3383 1.3245 9.6576 1.3030 1.2971 1.3045 1.2992 1.2999 1.3156 1.3285 1.3271 1.3501 1.3498 1.3525 1.3451 1.3369 9.8588 1.2493 1.2281 1.2360 1.2244 1.2288 1.2448 1.2638 1.2667 1.2982 1.3022 1.3106 1.3094 1.3078 10.0600 1.2452 1.2199 1.2125 1.1965 1.2100 1.2264 1.2389 1.2541 1.2913 1.2982 1.3115 1.3141 1.3189 10.2612 1.2933 1.2613 1.2385 1.2213 1.2353 1.2512 1.2596 1.2814 1.3232 1.3310 1.3479 1.3531 1.3635 10.4624 1.2742 1.2378 1.2074 1.1831 1.1978 1.2132 1.2161 1.2470 1.2935 1.3040 1.3266 1.3372 1.3565 10.6636 1.1903 1.1511 1.1155 1.0858 1.1008 1.1151 1.1116 1.1513 1.2011 1.2153 1.2442 1.2618 1.2918 10.8648 1.1534 1.1034 1.0619 1.0246 1.0357 1.0475 1.0339 1.0826 1.1339 1.1534 1.1868 1.2125 1.2483 11.0660 1.1686 1.1055 1.0505 1.0076 1.0144 1.0230 1.0019 1.0542 1.1061 1.1275 1.1644 1.1945 1.2346
  • 11.2672 1.1722 1.0888 1.0154 0.9589 0.9564 0.9568 0.9310 0.9719 1.0161 1.0346 1.0694 1.1019 1.1442
  • 11.4684 1.1056 1.0112 0.9309 0.8681 0.8627 0.8591 0.8328 0.8670 0.9067 0.9202 0.9538 0.9879 1.0397
  • 11.6696 0.8977 0.8150 0.7452 0.6869 0.6855 0.6815 0.6598 0.6876 0.7210 0.7278 0.7592 0.7897 0.8447
  • 11.8708 0.4499 0.4077 0.3725 0.3471 0.3436 0.3426 0.3326 0.3497 0.3703 0.3782 0.4017 0.4252 0.4548
  • 12.0720 0.0800 0.0690 0.0605 0.0588 0.0551 0.0561 0.0553 0.0631 0.0731 0.0804 0.0977 0.1161 0.1281
  • Top and Bottom 8% Excluded

PACIFIC GAS AND ELECTRIC COMPANY NUMBER COLR 2 DIABLO CANYON POWER PLANT REVISION 16 PAGE 12 OF 16 TITLE:

COLR for Diablo Canyon Unit 2 UNIT 2

COLR_2u2r16.DOC 04B 1029.1516 Table 2B: T(Z) Factors versus Burnup as a Function of Core Height for ROS2 Burnup (MWD/MTU)

Height (ft) 150 1000 2000 3000 4000 5000 6000 8000 10000 12000 14000 16000 18000

  • 0.0000 0.4993 0.4566 0.4070 0.3886 0.3782 0.3708 0.3626 0.3724 0.3845 0.3733 0.3981 0.4311 0.4510
  • 0.2012 0.5218 0.4801 0.4307 0.4134 0.4042 0.3978 0.3905 0.4038 0.4197 0.4394 0.4698 0.5098 0.5349
  • 0.4024 0.6942 0.6419 0.5786 0.5567 0.5449 0.5365 0.5265 0.5424 0.5607 0.5788 0.6136 0.6597 0.6856
  • 0.6036 1.1358 1.0578 0.9603 0.9271 0.9093 0.8958 0.8788 0.9008 0.9240 0.9439 0.9886 1.0486 1.0757
  • 0.8048 1.2656 1.1954 1.1026 1.0727 1.0601 1.0501 1.0352 1.0657 1.0944 1.1157 1.1632 1.2256 1.2484 1.0060 1.2380 1.1961 1.1279 1.1147 1.1156 1.1160 1.1092 1.1528 1.1896 1.2130 1.2601 1.3193 1.3344 1.2072 1.2639 1.2350 1.1789 1.1714 1.1780 1.1819 1.1775 1.2231 1.2587 1.2779 1.3182 1.3698 1.3761 1.4084 1.2707 1.2555 1.2128 1.2108 1.2228 1.2299 1.2276 1.2732 1.3059 1.3203 1.3524 1.3956 1.3934 1.6096 1.2767 1.2744 1.2447 1.2469 1.2635 1.2726 1.2717 1.3150 1.3432 1.3521 1.3751 1.4095 1.3991 1.8108 1.2711 1.2786 1.2605 1.2648 1.2843 1.2943 1.2944 1.3334 1.3565 1.3605 1.3748 1.4012 1.3842 2.0120 1.2180 1.2329 1.2258 1.2313 1.2528 1.2635 1.2649 1.2995 1.3189 1.3208 1.3288 1.3494 1.3294 2.2132 1.1773 1.1988 1.2017 1.2077 1.2303 1.2410 1.2431 1.2719 1.2869 1.2903 1.2920 1.3073 1.2843 2.4144 1.2173 1.2414 1.2522 1.2566 1.2797 1.2889 1.2901 1.3115 1.3198 1.3143 1.3077 1.3160 1.2871 2.6156 1.2436 1.2642 1.2824 1.2845 1.3076 1.3153 1.3157 1.3298 1.3326 1.3239 1.3103 1.3132 1.2796 2.8168 1.2305 1.2492 1.2723 1.2759 1.2941 1.3004 1.3012 1.3091 1.3081 1.2986 1.2805 1.2799 1.2447 3.0180 1.2159 1.2433 1.2587 1.2705 1.2838 1.2890 1.2877 1.2868 1.2832 1.2732 1.2520 1.2485 1.2155 3.2192 1.2167 1.2496 1.2632 1.2775 1.2934 1.2980 1.2916 1.2845 1.2785 1.2666 1.2448 1.2395 1.2106 3.4204 1.2328 1.2660 1.2899 1.3077 1.3173 1.3212 1.3144 1.2983 1.2872 1.2691 1.2466 1.2409 1.2159 3.6216 1.2222 1.2529 1.2877 1.3065 1.3120 1.3176 1.3096 1.2862 1.2722 1.2503 1.2287 1.2249 1.2054 3.8228 1.1723 1.2013 1.2439 1.2639 1.2666 1.2746 1.2657 1.2387 1.2242 1.2015 1.1848 1.1864 1.1746 4.0240 1.1841 1.2149 1.2627 1.2831 1.2835 1.2906 1.2789 1.2440 1.2254 1.1995 1.1869 1.1902 1.1819 4.2252 1.2383 1.2708 1.3246 1.3452 1.3420 1.3482 1.3329 1.2883 1.2639 1.2333 1.2235 1.2267 1.2205 4.4264 1.2416 1.2771 1.3331 1.3540 1.3485 1.3551 1.3384 1.2891 1.2630 1.2317 1.2274 1.2329 1.2315 4.6276 1.2420 1.2800 1.3371 1.3576 1.3497 1.3560 1.3377 1.2835 1.2551 1.2263 1.2231 1.2297 1.2319 4.8288 1.2474 1.2824 1.3401 1.3600 1.3532 1.3560 1.3366 1.2783 1.2479 1.2219 1.2189 1.2261 1.2313 5.0300 1.2547 1.2838 1.3416 1.3610 1.3561 1.3556 1.3358 1.2748 1.2436 1.2213 1.2192 1.2276 1.2363 5.2312 1.2678 1.2879 1.3454 1.3639 1.3606 1.3564 1.3361 1.2743 1.2402 1.2211 1.2190 1.2276 1.2387 5.4324 1.2627 1.2808 1.3237 1.3415 1.3400 1.3326 1.3126 1.2543 1.2150 1.1997 1.1968 1.2047 1.2185 5.6336 1.2182 1.2446 1.2686 1.2790 1.2823 1.2746 1.2584 1.2183 1.1822 1.1650 1.1725 1.1792 1.2018 5.8348 1.2743 1.3024 1.3279 1.3359 1.3410 1.3313 1.3145 1.2668 1.2285 1.2092 1.2164 1.2214 1.2457 6.0360 1.3375 1.3679 1.3935 1.4001 1.4035 1.3928 1.3759 1.3216 1.2807 1.2591 1.2646 1.2673 1.2924 6.2372 1.3301 1.3623 1.3892 1.3943 1.3977 1.3883 1.3741 1.3189 1.2801 1.2601 1.2655 1.2687 1.2949 6.4384 1.2860 1.3195 1.3473 1.3520 1.3562 1.3492 1.3390 1.2862 1.2520 1.2350 1.2412 1.2511 1.2732 6.6396 1.3164 1.3516 1.3800 1.3827 1.3858 1.3792 1.3707 1.3151 1.2811 1.2635 1.2675 1.2758 1.2971 6.8408 1.3756 1.4092 1.4379 1.4417 1.4396 1.4328 1.4255 1.3657 1.3304 1.3109 1.3114 1.3196 1.3363 7.0420 1.3686 1.3998 1.4288 1.4356 1.4312 1.4266 1.4203 1.3656 1.3296 1.3113 1.3103 1.3196 1.3332 7.2432 1.3137 1.3418 1.3705 1.3805 1.3777 1.3758 1.3702 1.3249 1.2911 1.2763 1.2752 1.2859 1.2980 7.4444 1.3001 1.3261 1.3544 1.3655 1.3637 1.3630 1.3581 1.3190 1.2863 1.2731 1.2706 1.2797 1.2896 7.6456 1.3572 1.3835 1.4115 1.4208 1.4186 1.4175 1.4125 1.3740 1.3395 1.3246 1.3176 1.3218 1.3284 7.8468 1.3856 1.4119 1.4393 1.4464 1.4444 1.4435 1.4398 1.4038 1.3700 1.3549 1.3444 1.3437 1.3480 8.0480 1.3403 1.3670 1.3937 1.3988 1.3989 1.3997 1.3999 1.3708 1.3430 1.3310 1.3199 1.3157 1.3206 8.2492 1.2827 1.3103 1.3362 1.3384 1.3409 1.3434 1.3487 1.3264 1.3046 1.2963 1.2854 1.2789 1.2854 8.4504 1.3172 1.3475 1.3720 1.3678 1.3707 1.3728 1.3825 1.3607 1.3449 1.3364 1.3211 1.3053 1.3105 8.6516 1.3257 1.3534 1.3759 1.3657 1.3693 1.3729 1.3866 1.3670 1.3582 1.3515 1.3367 1.3200 1.3163 8.8528 1.2759 1.2967 1.3195 1.3112 1.3138 1.3235 1.3353 1.3185 1.3216 1.3182 1.3072 1.2970 1.2800 9.0540 1.2175 1.2381 1.2518 1.2532 1.2562 1.2691 1.2723 1.2690 1.2803 1.2758 1.2727 1.2659 1.2478 9.2552 1.2414 1.2583 1.2652 1.2697 1.2726 1.2865 1.2890 1.2905 1.3053 1.2993 1.2979 1.2899 1.2726 9.4564 1.2944 1.3010 1.3100 1.3078 1.3100 1.3246 1.3340 1.3308 1.3486 1.3477 1.3470 1.3380 1.3119 9.6576 1.3028 1.2963 1.3038 1.2988 1.2999 1.3156 1.3285 1.3270 1.3498 1.3493 1.3519 1.3447 1.3296 9.8588 1.2491 1.2279 1.2355 1.2242 1.2288 1.2448 1.2638 1.2666 1.2981 1.3019 1.3103 1.3091 1.3080 10.0600 1.2450 1.2197 1.2121 1.1965 1.2100 1.2264 1.2389 1.2541 1.2912 1.2980 1.3112 1.3137 1.3189 10.2612 1.2932 1.2612 1.2383 1.2212 1.2353 1.2512 1.2596 1.2813 1.3231 1.3308 1.3476 1.3527 1.3635 10.4624 1.2740 1.2377 1.2074 1.1831 1.1978 1.2132 1.2161 1.2468 1.2934 1.3039 1.3263 1.3368 1.3565 10.6636 1.1903 1.1511 1.1155 1.0858 1.1008 1.1150 1.1116 1.1512 1.2011 1.2153 1.2440 1.2615 1.2918 10.8648 1.1534 1.1034 1.0619 1.0246 1.0357 1.0475 1.0339 1.0824 1.1339 1.1534 1.1866 1.2121 1.2483 11.0660 1.1686 1.1055 1.0505 1.0076 1.0144 1.0230 1.0017 1.0541 1.1061 1.1275 1.1643 1.1941 1.2346
  • 11.2672 1.1722 1.0888 1.0154 0.9589 0.9564 0.9567 0.9309 0.9718 1.0161 1.0346 1.0693 1.1016 1.1442
  • 11.4684 1.1056 1.0112 0.9309 0.8681 0.8627 0.8590 0.8327 0.8669 0.9067 0.9202 0.9538 0.9876 1.0397
  • 11.6696 0.8977 0.8150 0.7452 0.6869 0.6854 0.6814 0.6597 0.6875 0.7210 0.7279 0.7583 0.7895 0.8447
  • 11.8708 0.4499 0.4077 0.3725 0.3471 0.3436 0.3426 0.3325 0.3496 0.3703 0.3785 0.3987 0.4252 0.4548
  • 12.0720 0.0800 0.0690 0.0605 0.0588 0.0551 0.0561 0.0553 0.0631 0.0731 0.0809 0.0929 0.1164 0.1281
  • Top and Bottom 8% Excluded

PACIFIC GAS AND ELECTRIC COMPANY NUMBER COLR 2 DIABLO CANYON POWER PLANT REVISION 16 PAGE 13 OF 16 TITLE:

COLR for Diablo Canyon Unit 2 UNIT 2

COLR_2u2r16.DOC 04B 1029.1516 Table 3: Required Thermal Power Limits and AFD Reductions RAOC Operating Space Required Action Space Required FQW(z) Margin Improvement (%)

Required THERMAL POWER Limit

(%RTP)

Required AFD Reduction ROS1 RA1 1.49 95 See Figure 3

>1.49

<50 N/A ROS2 RA2 2.05 95 See Figure 3

>2.05

<50 N/A

PACIFIC GAS AND ELECTRIC COMPANY NUMBER COLR 2 DIABLO CANYON POWER PLANT REVISION 16 PAGE 14 OF 16 TITLE:

COLR for Diablo Canyon Unit 2 UNIT 2

COLR_2u2r16.DOC 04B 1029.1516 Figure 1: Control Bank Insertion Limits Versus Rated Thermal Power 225.---,---:---,-----:---r----:--r-----:-~~======:::::;;:--r----:--r-----:~

VI (Cl,~~3, 225) I 200 _________

..,../ _________

175 -----~+--->"-

/ --+-V_ : __________

11~t1-.o-+-

, 1~~s,,.._

  • V_

t,*

, /

y/..:....

/

I BANK C I:

150 1-----+--y-: -+-

v -,,t;-:-.. +--.. -..... ---+

. -.... -... -. --.-.,.-. +--/ - : --+v-,,t;-. -.*... -.. -.

12 5, l------l---,,<'-----+----+--+----+-----1-----++----+---* -----i-----1 100 /v

  • 1 (o.o, 98) 1:

75 50 25 v

/

V:

/

Valid fa Fully Withdrawt1 Rod Positions: :: 225 Steps and~ 231 Steps 0

/ I (o. n s, 0} I 0.0 0.1

0. '

0.3 0.4

0.

0.16

0.

0.8 0.9 1 0 IFra.ct'ion of Rated 'Thermal Power

PACIFIC GAS AND ELECTRIC COMPANY NUMBER COLR 2 DIABLO CANYON POWER PLANT REVISION 16 PAGE 15 OF 16 TITLE:

COLR for Diablo Canyon Unit 2 UNIT 2

COLR_2u2r16.DOC 04B 1029.1516 Figure 2: AFD Limits as a Function of Rated Thermal Power for Normal Operation 120 1(-14,100) 1

(+10, 100) 1 100..__ tj UNACCEPTABLE II I UNACCEPTABLE I

\\

OPERATION OPERATION I

\\

I I

80

.. i 0

0..

ic I

I

\\

ACCEPTABLE I

I OPERATION I \\

I 1

E..

Q)

.c:

60 t-

-0 Q)...

11:1 0::

J

\\

I

\\

I 0

~

0 I (-30,50)

II (+25,50 I 40 20 0

-60

-50

-40

-30

-20

-10 0

10 20 30 40 50 60 Flux Difference (DEL TA I)%

PACIFIC GAS AND ELECTRIC COMPANY NUMBER COLR 2 DIABLO CANYON POWER PLANT REVISION 16 PAGE 16 OF 16 TITLE:

COLR for Diablo Canyon Unit 2 UNIT 2

COLR_2u2r16.DOC 04B 1029.1516 Figure 3: AFD Limits as a Function of Rated Thermal Power for FQ Improvement Power

(% RTP)

ROS1 AFD Limit (%)

ROS2 AFD Limit (%)

Power

(% RTP)

RA1 AFD Limit (%)

RA2 AFD Limit (%)

50

-30

-26 50

-29

-25 100

-14

-10 95

-14.6

-10.6 100 10 10 95 10.5 10.5 50 25 25 50 24 24 110 100 90 80 L..

(lJ 3:: 70 0

a..

cu E Go (lJ

..c 1-

"'0 E:l so cu 0:::

4-0

  • 40 30 20 10 0

I I Unacceptable Operation I

I

/ /..

I I

Acceptable Operation

-- ROSl

  • * * *
  • ROS2
  • - RAl
  • RA2

-35

-30

-25

-20

-15

-10

-5 0

5 Flux Difference (Delta I) %

Unacceptable Operation 10 15 20 25 30

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