Text

Core Operating Limits Report for Unit 1 Cycle 12
	ML031290137
Person / Time
Site:	Diablo Canyon
Issue date:	03/21/2003
From:	Oatley D; Pacific Gas & Electric Co
To:	; Document Control Desk, Office of Nuclear Reactor Regulation
References
	DCL-03-033
	Download: ML031290137 (52)
	v • d • e

Pacific Gas and Electric Company David H. Oatley Diablo Canyon Power Plant Vice President and PO Box 55 General Manager Avila Beach, CA 93424 March 21, 2003 8055454350 Fax 8055454234 PG&E Letter DCL-03-033 U.S. Nuclear Regulatory Commission ATTN: Document Control Desk Washington, DC 20555-0001 Docket No. 50-275, OL-DPR-80 Diablo Canyon Unit 1 Core Operatincg Limits Report for Unit 1 Cycle 12

Dear Commissioners and Staff:

In accordance with Diablo Canyon Power Plant Technical Specification 5.6.5.d, enclosed are revisions 3, 2, and 1 of the Core Operating Limits Report for Diablo Canyon Unit 1 Cycle 12. These revisions incorporate changes made during the current Unit 1 twelfth operating cycle. These changes are being submitted after their date of issuance due to an administrative oversight regarding the submittal of midcycle changes to the COLR. Administrative controls for the identification of midcycle changes have been revised to ensure timely submittal in the future.

Sincerely, David H. Oatley ddmI2254IA0578484 cc/enc: Edgar Bailey, DHS William B. Jones Ellis W. Merschoff David L. Prouix Girija S. Shukla cc: Diablo Distribution Aw0l A member of the STARS (Strategic Teaming and Resource Sharing) Alliance Callaway

Comanche Peak

Diablo Canyon

Palo Verde

South Texas Project a Wolf Creek

Enclosure PG&E Letter DCL-03-033 CORE OPERATING LIMITS REPORT (COLR)

DIABLO CANYON POWER PLANT UNIT 1, CYCLE 12, REVISION 3 (16 Pages)

EFFECTIVE DATE MARCH 13, 2003

- - UNCONTROLLED PROCEDURE - DONOTUSE TO PERFORM WORK or ISSUE FOR USE * *

PACIFIC GAS AND ELECTRIC COMPANY NUMBER COLR 1-12 NUCLEAR POWER GENERATION REVISION 3 DIABLO CANYON POWER PLANT PAGE 1 OF 16 CORE OPERATING LIMITS REPORT UNIT TITLE: COLR For Diablo Canyon Unit 1 Cycle 12 1

03/13/03 EFFECTIVE DATE PROCEDURE CLASSIFICATION: QUALITY RELATED CORE OPERATING LIMITS REPORT This Core Operating Limits Report (COLR) for Diablo Canyon Unit 1 Cycle 12 has been prepared in accordance with the requirements of Technical Specification (TS) 5.6.5.

The Technical Specifications affected by this report are listed below:

3.1.1 - Shutdown Margin (MODE 2 with kff < 1.0, MODES 3, 4, and 5) 3.1.3 - Moderator Temperature Coefficient 3.1.5 - Shutdown Bank Insertion Limits 3.1.6 - Control Bank Insertion Limits 3.2.1 - Heat Flux Hot Channel Factor - FQ(Z) 3.2.2 - Nuclear Enthalpy Rise Hot Channel Factor - FAHN 3.2.3 - Axial Flux Difference - (AFD) 3.9.1 - Boron Concentration

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)

The SDM limit for MODE 2 with kff < 1.0, MODES 3 and 4 is:

2.1.1 The shutdown margin with Safety Injection enabled shall be greater than or equal to 1.6% Ak/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% Ak/k calculated at a temperature of 200 0F.

The SDM limit for MODE 5 is:

2.1.3 The shutdown margin shall be greater than or equal to 1.0% Ak/k. However, an administrative value of 1.6 % Ak/k will be used to address concerns of NSAL-02-014.

2.2 Shutdown Margin (SDM) for MODE 1 and MODE 2 with kff 1.0 is:

2.2.1 The shutdown margin shall be greater than or equal to 1.6% Ak/k. I 5ZYMZ103 DOC 04B 0313 0243

PACIFIC GAS AND ELECTRIC COMPANY NUMBER COLR 1-12 DIABLO CANYON POWER PLANT REVISION 3 PAGE 2 OF 16 TITLE: COLR For Diablo Canyon Unit 1 Cycle 12 UNIT 1 2.3 Moderator Temperature Coefficient (MTC) (TS 3.1.3)

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

2.3.1 The MTC shall be less negative than -3.9x104 Ak/k/0 F for all rods withdrawn, end of cycle life (EOL), RATED THERMAL POWER condition.

2.3.2 The MTC 300 ppm surveillance limit is -3.0x1 04 Ak/k/0 F (all rods withdrawn, RATED THERMAL POWER condition).

2.3.3 The MTC 60 ppm surveillance limit is -3.72x1 04 Akc/k/F (all rods withdrawn, RATED THERMAL POWER condition).

2.4 Shutdown Bank Insertion Limits (TS 3.1.5) 2.4.1 Each shutdown bank shall be withdrawn to at least 225 steps.

2.5 Control Bank Insertion Limits (TS 3.1.6) 2.5.1 The control banks shall be limited in physical insertion as shown in Figure 1.

2.6 Heat Flux Hot Channel Factor - FQ(Z) (TS 3.2.1)

RTP 2.6.1 FQ(Z)< F0 *K(Z) forP>0.5 FRTP FQ(Z) s 0.5

K(Z) for P s 0.5 where: P = THERMAL POWER RATED THERMAL POWER FQRTP= 2.45 K(Z)= 1.0 2.6.2 The W(Z) curves* for Relaxed Axial Offset Control (RAOC) operation, provided in Figures 2 through 5, and Tables 2A and 2B are sufficient to determine the RAOC W(Z) versus core height for Cycle 12 burnups through the end of full power reactivity plus a power coastdown of up to 1000 MWDIMTU.

Table 1 shows FQ margin decreases that are greater than 2% per 31 Effective Full Power Days (EFPD). These values shall be used to increase FQw(Z) per SR 3.2.1.2. A 2% penalty factor shall be used at all cycle bumups that are outside the range of Table 1.

NOTE: That the W(Z) data is appropriate for use if the predicted axial offset is within +/-3% of the measured value.

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Li** U/cONTRIOLLED PROCEDURE- D NOVT USE ItO PEROM WORK or ISSUE FOR USE *** 1 PACIFIC GAS AND ELECTRIC COMPANY NUMBER COLR 1-12 DIABLO CANYON POWER PLANT REVISION 3 PAGE 3 OF 16 TITLE: COLR For Diablo Canyon Unit 1 Cycle 12 UNIT 1 2.6.3 FQ(Z) shall be evaluated to determine if it is within its limits by verifying that FQC(Z) and FQW(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:

c RTP

K(Z)

FQC(Z) < K(Z) for P > 0.5 P

FQC(Z) < Q *K(Z) for P > 0.5 0.5 FQW(Z) <f L

K(Z) for P >O.5 CRP FQW(Z) 0.5* K(Z) for P < 0.5 where:

FQC(Z) is the measured FQ(Z) increased by the allowances for manufacturing tolerances and measurement uncertainty.

FQRTP is the FQ limit K(Z) is the normalized FQ(Z) as a function of core height P is the relative THERMAL POWER, and W(z) is the cycle dependent function that accounts for power distribution transients encountered during normal operation.

FQRTP and K(Z) are specified in 2.6.1 and W(Z) is specified in 2.6.2.

FQW(Z) is the total peaking factor, FQC(Z), multiplied by W(Z) which gives the maximum FQ(Z) calculated to occur in normal operation.

DZMZ03 DOC 04B 0313 0243

UNYCONlTROLLED PROCEDUJRE DO NOT USE TO PERFORM WORKor ISSUE FOR USE *4*

PACIFIC GAS AND ELECTRIC COMPANY NUMBER COLR 1-12 DIABLO CANYON POWER PLANT REVISION 3 PAGE 4 OF 16 TITLE: COLR For Diablo Canyon Unit 1 Cycle 12 UNIT 1 2.7 Nuclear Enthalpy Rise Hot Channel Factor (TS 3.2.2)

FmN

FMRTP *[1 + PFm * (1-P)]

where:

THERMAL POWER RATED THERMAL POWER FmN = Measured values of FHN obtained by using the moveable incore detectors to obtain a power distribution map.

FAHRTP = 1.59 PFH = 0.3 2.8 Axial Flux Difference (TS 3.2.3) 2.8.1 The Axial Flux Difference (AFD) Limits are provided in Figure 6.

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 kff 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.

5ZYMZ103 DOC 04B 0313 0243

UNCONTROLLED e*

PROCEDURE- DO NOT USE TO PERFORM WORK or ISSUEFOR USE **

PACIFIC GAS AND ELECTRIC COMPANY NUMBER COLR 1-12 DIABLO CANYON POWER PLANT REVISION 3 PAGE 5 OF 16 TITLE: COLR For Diablo Canyon Unit 1 Cycle 12 UNIT 1

3. TABLES 3.1 Table 1, "FQ Margin Decreases in Excess of 2% Per 31 EFPD."

3.2 Table 2A, "Load Follow W(Z) Factors at 150 and 4,000 MWD/MTU as a Function of Core Height."

3.3 Table 2B, "Load Follow W(Z) Factors at 12,000 and 22,000 MWD/MTU as a Function of Core Height."

4. FIGURES 4.1 Figure 1, "Control Bank Insertion Limits Versus Rated Thermal Power."

4.2 Figure 2, "Load Follow W(Z) at 150 MWD/MTU as a Function of Core Height."

4.3 Figure 3, "Load Follow W(Z) at 4,000 MWD/MTU as a Function of Core Height."

4.4 Figure 4, "Load Follow W(Z) at 12,000 MWD/MTU as a Function of Core Height."

4.5 Figure 5, "Load Follow W(Z) at 22,000 MWD/MTU as a Function of Core Height."

4.6 Iigure 6, "Aft) Limits as a Function of Kated ihermal Power."

5. RECORDS None

6. REFERENCES 6.1 Westinghouse Reload Safety Evaluation for Diablo Canyon Power Plant Unit 1 Cycle 12, dated February 2002.

7. SPONSOR Jay Lesko SZYMZI03 DOC 04B 0313 0243

PACIFIC GAS AND ELECTRIC COMPANY NUMBER COLR 1-12 DIABLO CANYON POWER PLANT REVISION 3 PAGE 6 OF 16 TITLE: COLR For Diablo Canyon Unit 1 Cycle 12 UNIT 1 TABLE 1: FQ Margin Decreases in Excess of 2% Per 31 EFPD Cycle Max. % Decrease Burnup in Fo Margin 150 4.46 313 4.52 476 4.52 638 4.40 801 4.12 964 3.68 1127 3.12 1290 2.50 1453 2.00 3244 2.00 3406 2.56 3569 3.65 3732 4.61 3895 5.33 4058 6.00 4221 6.86 4383 5.80 4546 4.33 4709 2.85 4872 2.00 10408 2.00 10571 2.50 10734 3.22 10896 3.78 11059 3.54 11222 3.31 11385 3.07 11548 2.82 11711 2.57 11873 2.31 12036 2.09 12199 2.02 12362 2.00 NOTE: All cycle burnups outside the range of this table shall use a 2% decrease in FQ margin for compliance with SR 3.2.1.2. Linear interpolation is adequate for intermediate cycle burnups.

SZYMZI03.DOC 04B 0313 0243

.7I*U#CONTROLLED PROCEDURE- DO NOT USE TO PERFORM WORK or ISSUE FOR USE **

PACIFIC GAS AND ELECTRIC COMPANY NUMBER COLR 1-12 DIABLO CANYON POWER PLANT REVISION 3 PAGE 7 OF 16 TITLE: COLR For Diablo Canyon Unit 1 Cycle 12 UNIT I TABLE 2A: Load Follow W(Z) Factors at 150 and 4000 MWD/MTU as a Function of Core Height HEIGHT 150 MWD/MTU HEIGHT 4000 MWD/MTU (FEET) W(Z) (FEET) W(Z)

0.0000 1.0000 *0.0000 1.0000

0.2000 1.0000 *0.2000 1.0000

0.4000 1.0000 *0.4000 1.0000

0.6000 1.0000 *0.6000 1.0000

0.8000 1.0000 *0.8000 1.0000

1.0000 1.0000 *1.0000 1.0000

1.2000 1.0000 *1.2000 1.0000

1.4000 1.0000 *1.4000 1.0000

1.6000 1.0000 *1.6000 1.0000

1.8000 1.0000 *1.8000 1.0000 2.0000 1.1450 2.0000 1.1554 2.2000 1.1307 2.2000 1.1395 2.4000 1.1166 2.4000 1.1237 2.6000 1.1029 2.6000 1.1083 2.8000 1.0885 2.8000 1.0925 3.0000 1.0795 3.0000 1.0812 3.2000 1.0783 3.2000 1.0787 3.4000 1.0796 3.4000 1.0828 3.6000 1.0832 3.6000 1.0858 3.8000 1.0883 3.8000 1.0883 4.0000 1.0934 4.0000 1.0904 4.2000 1.0978 4.2000 1.0919 4.4000 1.1018 4.4000 1.0929 4.6000 1.1052 4.6000 1.0931 4.8000 1.1085 4.8000 1.0951 5.0000 1.1128 5.0000 1.0981 5.2000 1.1185 5.2000 1.1010 5.4000 1.1250 5.4000 1.1034 5.6000 1.1320 5.6000 1.1051 5.8000 1.1399 5.8000 1.1140 NOTE: W(Z) values given above for 150 and 4000 MWD/MTU are plotted in COLR Figures 2 and 3, respectively.

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X PACIFIC GAS AND ELECTRIC COMPANY NUMBER COLR 1-12 DIABLO CANYON POWER PLANT REVISION 3 PAGE 8 OF 16 TITLE: COLR For Diablo Canyon Unit 1 Cycle 12 UNIT 1 TABLE 2A: Load Follow W(Z) Factors at 150 and 4000 MWD/MTU as a Function of Core Height (Continued)

HEIGHT 150 MWD/MTU HEIGHT 4000 MWD/MTU (FEET) W(Z) (FEET) W(Z) 6.0000 1.1504 6.0000 1.1269 6.2000 1.1636 6.2000 1.1387 6.4000 1.1770 6.4000 1.1500 6.6000 1.1897 6.6000 1.1609 6.8000 1.2009 6.8000 1.1688 7.0000 1.2142 7.0000 1.1825 7.2000 1.2315 7.2000 1.2045 7.4000 1.2501 7.4000 1.2242 7.6000 1.2681 7.6000 1.2426 7.8000 1.2844 7.8000 1.2594 8.0000 1.2986 8.0000 1.2741 8.2000 1.3105 8.2000 1.2867 8.4000 1.3199 8.4000 1.2967 8.6000 1.3268 8.6000 1.3033 8.8000 1.3293 8.8000 1.3101 9.0000 1.3339 9.0000 1.3261 9.2000 1.3467 9.2000 1.3519 9.4000 1.3623 9.4000 1.3755 9.6000 1.3757 9.6000 1.3975 9.8000 1.3899 9.8000 1.4160 10.0000 1.4068 10.0000 1.4362

10.2000 1.0000 *10.2000 1.0000

10.4000 1.0000 *10.4000 1.0000

10.6000 1.0000 *10.6000 1.0000

10.8000 1.0000 *10.8000 1.0000

11.0000 1.0000 *11.0000 1.0000

11.2000 1.0000 *11.2000 1.0000

11.4000 1.0000

11.4000 1.0000

11.6000 1.0000 *11.6000 1.0000

11.8000 1.0000 *11.8000 1.0000

12.0000 1.0000

12.0000 1.0000 NOTE: W(Z) values given above for 150 and 4000 MWD/MTU are plotted in COLR Figures 2 and 3, respectively.

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L *;* U O olE PROCEDURE -D NOT USE . WOK-rIS PACIFIC GAS AND ELECTRIC COMPANY NUMBER COLR 1-12 DIABLO CANYON POWER PLANT REVISION 3 PAGE 9 OF 16 TITLE: COLR For Diablo Canyon Unit 1 Cycle 12 UNIT 1 TABLE 2B: Load Follow W(Z) Factors at 12000 and 22000 MWD/MTU as a Function of Core Height HEIGHT 12000 MWD/MTU HEIGHT 22000 MWD/MTU (FEET) W(Z) (FEET) W(Z)

0.0000 1.0000 *0.0000 1.0000

0.2000 1.0000 *0.2000 1.0000

0.4000 1.0000 *0.4000 1.0000

0.6000 1.0000 *0.6000 1.0000

0.8000 1.0000 *0.8000 1.0000

1.0000 1.0000 *1.0000 1.0000

1.2000 1.0000 *1.2000 1.0000

1.4000 1.0000 *1.4000 1.0000

1.6000 1.0000 *1.6000 1.0000

1.8000 1.0000 *1.8000 1.0000 2.0000 1.2661 2.0000 1.2162 2.2000 1.2518 2.2000 1.2026 2.4000 1.2370 2.4000 1.1885 2.6000 1.2219 2.6000 1.1739 2.8000 1.2061 2.8000 1.1653 3.0000 1.1911 3.0000 1.1600 3.2000 1.1837 3.2000 1.1599 3.4000 1.1831 3.4000 1.1692 3.6000 1.1815 3.6000 1.1814 3.8000 1.1812 3.8000 1.1928 4.0000 1.1818 4.0000 1.2020 4.2000 1.1829 4.2000 1.2106 4.4000 1.1828 4.4000 1.2203 4.6000 1.1816 4.6000 1.2292 4.8000 1.1795 4.8000 1.2353 5.0000 1.1761 5.0000 1.2433 5.2000 1.1730 5.2000 1.2597 5.4000 1.1731 5.4000 1.2844 5.6000 1.1837 5.6000 1.3060 5.8000 1.1983 5.8000 1.3245 NOTE: W(Z) values given above for 12000 and 22000 MWD/MTU are plotted in COLR Figures 4 and 5, respectively.

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_PISSUEUSE TOFOR R USEE*FO X PACIFIC GAS AND ELECTRIC COMPANY NUMBER COLR 1-12 DIABLO CANYON POWER PLANT REVISION 3 PAGE 10 OF 16 TITLE: COLR For Diablo Canyon Unit 1 Cycle 12 UNIT I TABLE 2B: Load Follow W(Z) Factors at 12000 and 22000 MWD/MTU as a Function of Core Height (Continued)

HEIGHT 12000 MWD/MTU HEIGHT 22000 MWD/MTU (FEET) W(Z) (FEET) W(Z) 6.0000 1.2120 6.0000 1.3407 6.2000 1.2238 6.2000 1.3539 6.4000 1.2340 6.4000 1.3642 6.6000 1.2422 6.6000 1.3713 6.8000 1.2483 6.8000 1.3750 7.0000 1.2524 7.0000 1.3757 7.2000 1.2545 7.2000 1.3732 7.4000 1.2543 7.4000 1.3668 7.6000 1.2514 7.6000 1.3564 7.8000 1.2458 7.8000 1.3419 8.0000 1.2371 8.0000 1.3233 8.2000 1.2260 8.2000 1.3007 8.4000 1.2150 8.4000 1.2742 8.6000 1.2044 8.6000 1.2463 8.8000 1.1942 8.8000 1.2385 9.0000 1.1887 9.0000 1.2367 9.2000 1.1888 9.2000 1.2311 9.4000 1.2045 9.4000 1.2275 9.6000 1.2266 9.6000 1.2189 9.8000 1.2488 9.8000 1.2227 10.0000 1.2690 10.0000 1.2405

10.2000 1.0000 *10.2000 1.0000

10.4000 1.0000 *10.4000 1.0000

10.6000 1.0000 *10.6000 1.0000

10.8000 1.0000 *10.8000 1.0000

11.0000 1.0000 *11.0000 1.0000

11.2000 1.0000 *11.2000 1.0000

11.4000 1.0000 *11.4000 1.0000

11.6000 1.0000 *11.6000 1.0000

11.8000 1.0000 *11.8000 1.0000

12.0000 1.0000 *12.0000 1.0000 NOTE: W(Z) values given above for 12000 and 22000 MWD/MTU are plotted in COLR Figures 4 and 5, respectively.

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PACIFIC GAS AND ELECTRIC COMPANY NUMBER COLR 1-12 DIABLO CANYON POWER PLANT REVISION 3 PAGE 11 OF 16 TITLE: COLR For Diablo Canyon Unit 1 Cycle 12 UNIT 1 225 200 175 C

I-150 Cu en 125

.6-j a-C a.

C 100

-I Co 0

M 75 m

50 25 I I 0

0.0 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 1.0 Fraction of Rated Thermal Power FIGURE 1: Control Bank Insertion Limits Versus Rated Thermal Power 5ZYMZI03 DOC 04B 0313 0243

S7----1

_____CN TOS PERFORMI! WORK rISU FORUS**

PACIFIC GAS AND ELECTRIC COMPANY NUMBER COLR 1-12 DIABLO CANYON POWER PLANT REVISION 3 PAGE 12 OF 16 TITLE: COLR For Diablo Canyon Unit 1 Cycle 12 UNIT 1 1.5 1.4 1.3 N

-j 0Mo 1.2 1.1

I.

- - --- - -'.3 1.0 L.-I 0 2 4 6 8 10 12 Bottom Core Height (Feet) Top FIGURE 2: Load Follow W(Z) at 150 MWDJMTU as a Function of Core Height

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PACIFIC GAS AND ELECTRIC COMPANY NUMBER COLR 1-12 DIABLO CANYON POWER PLANT REVISION 3 PAGE 13 OF 16 TITLE: COLR For Diablo Canyon Unit 1 Cycle 12 UNIT 1 1.5 * -.------- riizii 1.4

- 1+

Ci "4 1.3

_ I 1.0 0 2 4 6 8 10 12 Bottom Core Height (Feet) Top FIGURE 3: Load Follow W(Z) at 4000 MWDJMTU as a Function of Core Height

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PACIFIC GAS AND ELECTRIC COMPANY NUMBER COLR 1-12 DIABLO CANYON POWER PLANT REVISION 3 PAGE 14 OF 16 TITLE: COLR For Diablo Canyon Unit 1 Cycle 12 UNIT 1 1.4 1.3

4 1.2

r, 0

0 C1d 1.1 1.0 0 2 4 6 8 10 12 Bottom Core Height (Feet) Top FIGURE 4: Load Follow W(Z) at 12000 MWD/MTU as a Function of Core Height

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UNCONTROLLEDPROCEDURE-DONOTUSE TOPERFORMWOR orISSUEFOR USE PACIFIC GAS AND ELECTRIC COMPANY NUMBER COLR 1-12 DIABLO CANYON POWER PLANT REVISION 3 PAGE 15 OF 16 TITLE: COLR For Diablo Canyon Unit 1 Cycle 12 UNIT 1 1.4 C__

__ __ _. __ __1 __

1.3 N

I.-

a 1.2

_iil1;j 11jpilty 00 0

C14 1.1 1.0 . - - - - - - - - - - - - -

0 2 4 6 8 10 12 Bottom Core Height (Feet) Top FIGURE 5: Load Follow W(Z) at 22000 MWD/MTU as a Function of Core Height

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PACIFIC GAS AND ELECTRIC COMPANY NUMBER COLR 1-12 DIABLO CANYON POWER PLANT REVISION 3 PAGE 16 OF 16 TITLE: COLR For Diablo Canyon Unit 1 Cycle 12 UNIT 1 120

(-l 14,100) l t _ _ (+10,100) _- _

100 UNACCEPTABLE __ = UNACCEPTABLE OPERAvlON OPERAv ON 80 ACCEPTABLE OPERATON I-s ci 0 60 EU I-40 20 0

50 -40 -30 -20 -10 0 10 20 30 40 50 60 Flux Difference (DELTA I) %

FIGURE 6: AFD Limits as a Function of Rated Thermal Power 5ZYMZ103 DOC 04B 0313 0243

Enclosure PG&E Letter DCL-03-033 CORE OPERATING LIMITS REPORT (COLR)

DIABLO CANYON POWER PLANT UNIT 1, CYCLE 12, REVISION 2 (16 Pages)

EFFECTIVE DATE FEBRUARY 20, 2003

.* UlNCO'T/WILOEDPROCEDURE-

^ DOINOTUSE TOPERFORMWORK orlISSUEFORUJSE; **

PACIFIC GAS AND ELECTRIC COMPANY NUMBER COLR 1-12 NUCLEAR POWER GENERATION REVISION 2 DIABLO CANYON POWER PLANT PAGE 1 OF 16 CORE OPERATING LIMITS REPORT UNIT TITLE: COLR Foi r Diablo Canyon Unit 1 Cycle 12 1 02/20/03 EFFECTIVE DATE PROCEDURE CLASSIFICATION: QUALITY RELATED

1. CORE OPERATING LIMITS REPORT This Core Operating Limits Report (COLR) for Diablo Canyon Unit I Cycle 12 has been prepared in accordance with the requirements of Technical Specification (TS) 5.6.5.

The Technical Specifications affected by this report are listed below:

3.1.1 - Shutdown Margin (MODE 2 with kff<< 1.0, MODES 3, 4, and 5) 3.1.3 - Moderator Temperature Coefficient 3.1.5 - Shutdown Bank Insertion Limits 3.1.6 - Control Bank Insertion Limits 3.2.1 - Heat Flux Hot Channel Factor - FQ(Z) 3.2.2 - Nuclear Enthalpy Rise Hot Channel Factor - F ,1 N 3.2.3 - Axial Flux Difference - (AFD) 3.9.1 - Boron Concentration

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)

The SDM limit for MODE 2 with keff < 1.0, MODES 3 and 4 is:

2.1.1 The shutdown margin with Safety Injection enabled shall be greater than or equal to 1.6% Ak/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% Ak/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 1.0% Ak/k. However, an administrative value of 1.6 % Ak/k will be used to address concerns of NSAL-02-0 14.

5ZYMZ103 DOC 04B 0220 1251

s UNCONTROLLEDPROCEDURE ODO NOT USE TO PERFORM WORKIorISSUE FOR USE

PACIFIC GAS AND ELECTRIC COMPANY NUM\IBER COLR 1-12 DIABLO CANYON POWER PLANT REVISION 2 PAGE 2 OF 16 TITLE: COLR For Diablo Canyon Unit 1 Cycle 12 UNIT 1 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 Ak/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 -3.0x104 Ak/k/0 F (all rods withdrawn, RATED THERMAL POWER condition).

2.2.3 The MTC 60 ppm surveillance limit is -3.72x10 4 Ak/k/0 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.

2.5 Heat Flux Hot Channel Factor-FQ(Z) (TS 3.2.1) 2.5.1 FQ(Z) < Qp

K(Z) for P > 0.5 RP FQ(Z) < 0.Q5

K(Z) for P c 0.5 THERMAL POWER where: P RATED THERMAL POWER FQRTP = 2.45 K(Z)= 1.0 2.5.2 The W(Z) curves* for Relaxed Axial Offset Control (RAOC) operation, provided in Figures 2 through 5, and Tables 2A and 2B are sufficient to determine the RAOC W(Z) versus core height for Cycle 12 burnups through the end of full power reactivity plus a power coastdown of up to 1000 MWD/MTU.

Table I shows FQ margin decreases that are greater than 2% per 31 Effective Full Power Days (EFPD). These values shall be used to increase FQW(Z) per SR 3.2.1.2. A 2% penalty factor shall be used at all cycle burnups that are outside the range of Table 1.

NOTE: That the W(Z) data is appropriate for use if the predicted axial offset is within +/-3% of the measured value.

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PACIFIC GAS AND ELECTRIC COMPANY NUMBER COLR 1-12 DIABLO CANYON POWER PLANT REVISION 2 PAGE 3 OF 16 TITLE: COLR For Diablo Canyon Unit 1 Cycle 12 UNIT 1 2.5.3 FQ(Z) shall be evaluated to determine if it is within its limits by verifying that FQC(Z) and FQW(Z) satisfy the following:

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

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:

FRTP

K(Z)

FQC(Z) < Q for P > 0.5 P

0.5 FQW(Z) < P

K(Z) for P > 0.5 RP FQW(Z)5 FQ5

K(Z) for P < 0.5 where:

FQC(Z) is the measured FQ(Z) increased by the allowances for manufacturing tolerances and measurement uncertainty.

FQRTIP is the FQ limit K(Z) is the normalized FQ(Z) as a function of core height P is the relative THERMAL POWER, and W(z) is the cycle dependent function that accounts for power distribution transients encountered during normal operation.

FQRTP and K(Z) are specified in 2.5.1 and W(Z) is specified in 2.5.2.

FQW(Z) is the total peaking factor, FQC(Z), multiplied by W(Z) which gives the maximum FQ(Z) calculated to occur in normal operation.

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FfN < FmRTP * [I + PF6H * (I -P)]

where:

THERMAL POWER n

RATED THERMAL POWER FHN = Measured values of FmN obtained by using the moveable incore detectors to obtain a power distribution map.

FAHRT = 1.59 PFAH = 0.3 2.7 Axial Flux Difference (TS 3.2.3) 2.7.1 The Axial Flux Difference (AFD) Limits are provided in Figure 6.

2.8 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:

2.8.1 A kff of 0.95 or less, with the most reactive control rod assembly completely withdrawn, or 2.8.2 A boron concentration of greater than or equal to 2000 ppm.

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PACIFIC GAS AND ELECTRIC COMPANY NUMBER COLR 1-12 DIABLO CANYON POWER PLANT REVISION 2 PAGE 5 OF 16 TITLE: COLR For Diablo Canyon Unit 1 Cycle 12 UNIT 1