Text

Core Operating Limits Report
	ML030780470
Person / Time
Site:	Diablo Canyon
Issue date:	03/14/2003
From:	Oatley D; Pacific Gas & Electric Co
To:	; Document Control Desk, Office of Nuclear Reactor Regulation
References
	DCL-03-029
	Download: ML030780470 (35)
	v • d • e

WI PacificGas and Electric Company David H. Oatley Diablo Canyon Power Plant Vice President and PO Box 56 General Manager Avila Beach. CA 93424 March 14, 2003 8055454350 Fax 805 545 4234 PG&E Letter DCL-03-029 U.S. Nuclear Regulatory Commission ATTN: Document Control Desk Washington, DC 20555-0001 Docket No. 50-323, OL-DPR-82 Diablo Canyon Unit 2 Core Operating Limits Report for Unit 2 Cycle 12

Dear Commissioners and Staff:

In accordance with Diablo Canyon Power Plant Technical Specification 5.6.5.d, enclosed are revisions 1 and 0 of the Core Operating Limits Report for Diablo Canyon Unit 2 Cycle 12. These revisions incorporate changes made during the current Unit 2 twelfth refueling outage.

Sincerely, David H. Oatley ddm/2254/A0533561 cc/enc: Edgar Bailey, DHS William B. Jones Ellis W. Merschoff David L. Proulx Girija S. Shukla cc: Diablo Distribution A member of the STARS (Strategic Teaming and Resource Sharing) Atllance Callaway

Comanche Peak e Diablo Canyon ° Palo Verde ° South Texas Project

Wolf Creek

Enclosure PG&E Letter DCL-03-029 CORE OPERATING LIMITS REPORT (COLR)

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

EFFECTIVE DATE MARCH 13, 2003

SUNCONTROLLED PROCEDURE-DO NOT USETOPERFORM WORK or lSSUE FOR USE *.*

PACIFIC GAS AND ELECTRIC COMPANY NUMBER COLR 2-12 NUCLEAR POWER GENERATION REVISION 1 DIABLO CANYON POWER PLANT PAGE 1 OF 16 CORE OPERATING LIMITS REPORT UNIT TITLE: COLR for Diablo Canyon Unit 2 Cycle 12 203/13/03 EFFECTIVE DATE ZZZZ=

PROCEDURE CLASSIFICATION: QUALITY RELATED

1. CORE OPERATING LIMITS REPORT This Core Operating Limits Report (COLR) for Diablo Canyon Unit 2 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 kfu< 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 kfr < 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 OF.

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 k~ff> 1.0 is:

2.2.1 The shutdown margin shall be greater than or equal to 1.6% Ak/k. I 7EPBFM01 DOC 04B 0313 0245

'*! UNCONTROLLDPROCEDURE- DONOTUSE TO PERFORM-WORKrISSUEFOR USE PACIFIC GAS AND ELECTRIC COMPANY NUMBER COLR 2-12 DIABLO CANYON POWER PLANT REVISION 1 PAGE 2 OF 16 TITLE: COLR for Diablo Canyon Unit 2 Cycle 12 UNIT 2 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 -3.9x10 4 Ak/k/°F for all rods withdrawn, end of cycle life (EOL), RATED THERMAL POWER condition.

The 300 ppm Surveillance limit is:

2.3.2 The MTC 300 ppm surveillance limit is -3.0x104 Ak/k/°F (all rods withdrawn, RATED THERMAL POWER condition).

The 60 ppm Surveillance limit is:

2.3.3 The MTC 60 ppm surveillance limit is - 3 .7 2 xl0"4 Ak/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) 2.6.1 FQ(Z) < E

K(Z) for P > 0.5 FQ(Z) < * -0.5

K(Z) for P _<0.5 THERMAL POWER where: P -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 bumups through the end of full power reactivity plus a power coastdown of up to 1000 MWD/MTU.

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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PACIFIC GAS AND ELECTRIC COMPANY NUMBER COLR 2-12 DIABLO CANYON POWER PLANT REVISION 1 PAGE 3 OF 16 TITLE: COLR for Diablo Canyon Unit 2 Cycle 12 UNIT 2 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:

FQc(Z) < XoP

K(Z) for P > 0.5 FQC(Z) < p FC(Z) A0.

K(Z) for P*5 0.5 FQW(Z) <<

FQw(Z) pP

K(Z)

EZ for P > 0.5 FQW(z) 0.5

K(Z) for P*5 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.

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"W PACIFIC GAS AND ELECTRIC COMPANY NUMBER COLR 2-12 DIABLO CANYON POWER PLANT REVISION 1 PAGE 4 OF 16 TITLE: COLR for Diablo Canyon Unit 2 Cycle 12 UNIT 2 2.7 Nuclear Enthalpy Rise Hot Channel Factor (TS 3.2.2)

FAN < FMRTP *[1 + PF, * (l-P)]

where:

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

FmRTv = 1.59 PFm = 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 k~ff 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.

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

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 rigure 0, "rIjt nmits as a runcuon o01i ateu inermal rower.

5. RECORDS None

6. REFERENCES 6.1 Westinghouse Reload Evaluation for Diablo Canyon Power Plant Unit 2 Cycle 12, dated February 2003.

7. SPONSOR Ken Kargol 7EPBFMO1 DOC 04B 0313 0245

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PACIFIC GAS AND ELECTRIC COMPANY NUMBER COLR 2-12 DIABLO CANYON POWER PLANT REVISION 1

.PAGE 6 OF 16 TITLE: COLR for Diablo Canyon Unit 2 Cycle 12 UNIT 2 TABLE 1: FQ Margin Decreases in Excess of 2% Per 31 EFPD Cycle Bumup (MWD/MTU) Max % Decrease In FQ Margin 0 2.70 150 2.70 313 3.18 476 3.59 638 3.86 801 3.95 964 3.83 1127 3.53 1290 3.09 1452 2.56 1615 2.21 1778 2.00 4545 2.00 4708 2.45 4871 3.03 5034 3.43 5196 3.32 5359 3.15 5522 2.95 5685 2.84 5848 2.71 6010 2.59 6173 2.48 6336 2.35 6499 2.29 6661 2.26 6824 2.24 6987 2.23 7150 2.22 7313 2.21 7475 2.19 7638 2.16 7801 2.04 7964 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.

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PACIFIC GAS AND ELECTRIC COMPANY NUMBER COLR 2-12 DIABLO CANYON POWER PLANT REVISION 1 PAGE 7 OF 16 TITLE: COLR for Diablo Canyon Unit 2 Cycle 12 UNIT 2 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 1.3688 2.0000 1.3461 2.2000 1.3453 2.2000 1.3200 2.4000 1.3249 2.4000 1.2935 2.6000 1.3054 2.6000 1.2668 2.8000 1.2857 2.8000 1.2392 3.0000 1.2645 3.0000 1.2163 3.2000 1.2492 3.2000 1.2034 3.4000 1.2452 3.4000 1.1981 3.6000 1.2408 3.6000 1.1913 3.8000 1.2356 3.8000 1.1833 4.0000 1.2296 4.0000 1.1756 4.2000 1.2224 4.2000 1.1696 4.4000 1.2142 4.4000 1.1657 4.6000 1.2050 4.6000 1.1606 4.8000 1.1949 4.8000 1.1547 5.0000 1.1838 5.0000 1.1481 5.2000 1.1726 5.2000 1.1410 5.4000 1.1617 5.4000 1.1332 5.6000 1.1502 5.6000 1.1235 5.8000 1.1495 5.8000 1.1242 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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PACIFIC GAS AND ELECTRIC COMPANY NUMBER COLR 2-12 DIABLO CANYON POWER PLANT REVISION 1 PAGE 8 OF 16 TITLE: COLR for Diablo Canyon Unit 2 Cycle 12 UNIT 2 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 1.1539 6.0000 1.1347 6.2000 1.1619 6.2000 1.1473 6.4000 1.1685 6.4000 1.1585 6.6000 1.1740 6.6000 1.1688 6.8000 1.1784 6.8000 1.1780 7.0000 1.1815 7.0000 1.1860 7.2000 1.1830 7.2000 1.1925 7.4000 1.1828 7.4000 1.1974 7.6000 1.1818 7.6000 1.2012 7.8000 1.1790 7.8000 1.2034 8.0000 1.1742 8.0000 1.2036 8.2000 1.1672 8.2000 1.2018 8.4000 1.1581 8.4000 1.1977 8.6000 1.1464 8.6000 1.1907 8.8000 1.1354 8.8000 1.1881 9.0000 1.1324 9.0000 1.1910 9.2000 1.1344 9.2000 1.2022 9.4000 1.1334 9.4000 1.2098 9.6000 1.1323 9.6000 1.2190 9.8000 1.1320 9.8000 1.2270 10.0000 1.1328 10.0000 1.2324

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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PACIFIC GAS AND ELECTRIC COMPANY NUMBER COLR 2-12 DIABLO CANYON POWER PLANT REVISION 1 PAGE 9 OF 16 TITLE: COLR for Diablo Canyon Unit 2 Cycle 12 UNIT 2 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 1.1928 2.0000 1.2020 2.2000 1.1825 2.2000 1.1874 2.4000 1.1719 2.4000 1.1726 2.6000 1.1613 2.6000 1.1584 2.8000 1.1561 2.8000 1.1500 3.0000 1.1518 3.0000 1.1517 3.2000 1.1491 3.2000 1.1602 3.4000 1.1505 3.4000 1.1686 3.6000 1.1548 3.6000 1.1760 3.8000 1.1585 3.8000 1.1854 4.0000 1.1612 4.0000 1.1961 4.2000 1.1631 4.2000 1.2058 4.4000 1.1639 4.4000 1.2136 4.6000 1.1637 4.6000 1.2193 4.8000 1.1623 4.8000 1.2236 5.0000 1.1603 5.0000 1.2249 5.2000 1.1562 5.2000 1.2276 5.4000 1.1524 5.4000 1.2449 5.6000 1.1616 5.6000 1.2669 5.8000 1.1768 5.8000 1.2874 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 2-12 DIABLO CANYON POWER PLANT REVISION 1 PAGE 10 OF 16 TITLE: COLR for Diablo Canyon Unit 2 Cycle 12 UNIT 2 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 1.1917 6.0000 1.3051 6.2000 1.2050 6.2000 1.3206 6.4000 1.2170 6.4000 1.3336 6.6000 1.2274 6.6000 1.3439 6.8000 1.2361 6.8000 1.3515 7.0000 1.2429 7.0000 1.3561 7.2000 1.2478 7.2000 1.3575 7.4000 1.2515 7.4000 1.3557 7.6000 1.2530 7.6000 1.3503 7.8000 1.2521 7.8000 1.3414 8.0000 1.2488 8.0000 1.3289 8.2000 1.2431 8.2000 1.3128 8.4000 1.2350 8.4000 1.2931 8.6000 1.2231 8.6000 1.2721 8.8000 1.2216 8.8000 1.2492 9.0000 1.2255 9.0000 1.2230 9.2000 1.2311 9.2000 1.2050 9.4000 1.2347 9.4000 1.2093 9.6000 1.2368 9.6000 1.2177 9.8000 1.2355 9.8000 1.2273 10.0000 1.2370 10.0000 1.2370

"*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 2-12 DIABLO CANYON POWER PLANT REVISION 1 PAGE 11 OF 16 TITLE: COLR for Diablo Canyon Unit 2 Cycle 12 UNIT 2 225 --- ------ ------- ------.........

............... 0.583,225) i...... ...

200

------ ------ -- ------ --------- ---- -------------- ----- (1.0, 188)-

175 i ---

. ... ----- ....--- ----------.. L .... ----.----.------.- ---.---. I-C

... .. ... . --. ..----- --- ----- -- --- I------

150 S..

Cu 125 ......... ---- -......

~~~

0

0 co 100 --. - .... . ........ - - - - - ........

CM 4-.

Cl 75 50 ....

-- --..... /I . --. ...... - - - - - - - - - - -- - - - - - -----

----...... .Positions: >225 Steps And <231tSteps 25

--- 0.380 ... ... ... ..

))] ------ --------- . . . --

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 7EPBFMO1 DOC 04B 0313 0245

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PACIFIC GAS AND ELECTRIC COMPANY NUMBER COLR 2-12 DIABLO CANYON POWER PLANT REVISION 1 PAGE 12 OF 16 TITLE: COLR for Diablo Canyon Unit 2 Cycle 12 UNIT 2 1.4 1.3 1.2 0

Im 4--K 1.1 1.0 0 2 4 6 8 10 12 Bottom Core Height (Feet) Top FIGURE 2: Load Follow W(Z) at 150 MWD/MTU as a Function of Core Height

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PACIFIC GAS AND ELECTRIC COMPANY NUMBER COLR 2-12 DIABLO CANYON POWER PLANT REVISION 1 PAGE 13 OF 16 TITLE: COLR for Diablo Canyon Unit 2 Cycle 12 UNIT 2 1.4 1.3

1.2 CD I.

1.1 1 1.0 0 2 4 6 8 10 12 Bottom Core Height (Feet) Top FIGURE 3: Load Follow W(Z) at 4000 MWD/MTU as a Function of Core Height

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PACIFIC GAS AND ELECTRIC COMPANY NUMBER COLR 2-12 DIABLO CANYON POWER PLANT REVISION 1 PAGE 14 OF 16 TITLE: COLR for Diablo Canyon Unit 2 Cycle 12 UNIT 2 1.4 1.3 1.2 CD I 4 C'D 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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PACIFIC GAS AND ELECTRIC COMPANY NUMBER COLR 2-12 DIABLO CANYON POWER PLANT REVISION 1 PAGE 15 OF 16 TITLE: COLR for Diablo Canyon Unit 2 Cycle 12 UNIT 2 1.4 1.3 1.2 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 2-12 DIABLO CANYON POWER PLANT REVISION 1 PAGE 16 OF 16 TITLE: COLR for Diablo Canyon Unit 2 Cycle 12 UNIT 2 120 100 80 0

t,E I"a) 60 o-40 20 0

-60 -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 7EPBFMOI.DOC 04B 0313 0245

Enclosure PG&E Letter DCL-03-029 CORE OPERATING LIMITS REPORT (COLR)

DIABLO CANYON POWER PLANT UNIT 2, CYCLE 12, REVISION 0 (16 Pages)

EFFECTIVE DATE FEBRUARY 20, 2003

- - ISSUED FOR USE BY: DATE: EXPIRES:____

PACIFIC GAS AND ELECTRIC COMPANY NUMBER COLR 2-12 NUCLEAR POWER GENERATION REVISION 0 DIABLO CANYON POWER PLANT PAGE 1 OF 16

" CORE OPERATING LIMITS REPORT UNIT TITLE: COLR for Diablo Canyon Unit 2 Cycle 12 2 02/20/03 EFFECTIVE DATE PROCEDURE CLASSIFICATION: QUALITY RELATED I1. CORE OPERATING LIMITS REPORT This Core Operating Limits Report (COLR) for Diablo Canyon Unit 2 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 k1ff< 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 - FA 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 '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-02-014.

7EPBFMOO.DOA 04B 0220 0713

PACIFIC GAS AND ELECTRIC COMPANY NUMB3ER COLR 2-12 DIABLO CANYON POWER PLANT REVISION 0 PAGE 2 OF 16 TITLE: COLR for Diablo Canyon Unit 2 Cycle 12 UNIT 2 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 -3.9x 10-4 Ak/k/°F for all rods withdrawn, end of cycle life (EOL), RATED THERMAL POWER condition.

The 300 ppm Surveillance limit is:

2.2.2 The MTC 300 ppm surveillance limit is -3.0x10"4 Ak/k/0 F (all rods withdrawn, RATED THERMAL POWER condition).

The 60 ppm Surveillance limit is:

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) < p K(Z) for P > 0.5 FQ(Z) < -0.5

K(Z) for P < 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 bumups through the end of full power reactivity plus a power coastdown of up to 1000 MWD/MTU.

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 burnups that are outside the range of Table 1.

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PACIFIC GAS AND ELECTRIC COMPANY NUMBER COLR 2-12 DIABLO CANYON POWER PLANT REVISION 0 PAGE 3 OF 16 TITLE: COLR for Diablo Canyon Unit 2 Cycle 12 UNIT 2 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 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:

FQc(Z) < !o

K(Z) for P > 0.5 P

FQc(Z) -<fQ.

K(Z) for P:5 0.5 0.5 FQw(Z) <F_.

FQw(Z) < P

K(Z)

for P > 0.5 FQw(Z) -0.5F_ ,0.K(Z) for P5_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 2.5.1 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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PACIFIC GAS AND ELECTRIC COMPANY NUMBER COLR 2-12 DIABLO CANYON POWER PLANT REVISION 0 PAGE 4 OF 16 TITLE: COLR for Diablo Canyon Unit 2 Cycle 12 UNIT 2 2.6 Nuclear Enthalpy Rise Hot Channel Factor (TS 3.2.2)

Fa*_F *11 + PFAH * (l-P)]

where:

THERMAL POWER RATED THERMAL POWER FAHN = Measured values of F*N obtained by using the moveable incore detectors to obtain a power distribution map.

FAHRTP = 1.59 PFA = 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 keff 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 2-12 DIABLO CANYON POWER PLANT REVISION 0 PAGE 5 OF 16 TITLE: COLR for Diablo Canyon Unit 2 Cycle 12 UNIT 2