DCL-11-073, Diablo Canyon, Unit 2 - Core Operating Limits Report for Cycle 17

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Diablo Canyon, Unit 2 - Core Operating Limits Report for Cycle 17
ML111680353
Person / Time
Site: Diablo Canyon Pacific Gas & Electric icon.png
Issue date: 06/18/2011
From: Welsch J M
Pacific Gas & Electric Co
To:
Document Control Desk, Office of Nuclear Reactor Regulation
References
DCL-11-073, OL-DPR-82
Download: ML111680353 (15)
v • d • e


Text

Pacific Gas and Electric Company June 18, 2011 PG&E Letter DCL-11-073 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 17 Dear Commissioners and Staff: James M. Welsch St a t ion D i r ec t o r Diab lo Ca nyon P o w e r P l a n t Ma il Co de 1 0 4/5/5 0 2 P. O. B o x 56 A vil a Bea c h , CA 9 34 2 4 80 5.545.3242 In terna l: 691.3 242 Fax: 8 0 5.54 5.42 3 4 I nternet: J MW1@pg e.co m In accordance with Diablo Canyon Power Plant (DCPP) Technical Specification 5.6.5.d, enclosed is the Core Operating Limits Report (COLR) for Unit 2. This document was revised for DCPP Unit 2, Cycle 17. There are no new or revised regulatory commitments in this submittal.

If there are any questions regarding the COLR, please contact Mr. Mark Mayer at (805) 545-4674.

Sincerely, M. Welsch swh/60024751 Enclosure cc: Diablo Distribution cc/enc: Elmo E. Collins, NRC Region IV Michael S. Peck, NRC Senior Resident Inspector James T. Polickoski, NRR Project Manager Alan B. Wang, NRR Project Manager A member of the STARS (Strategic Teaming and Resource Sharing) Alliance Callaway. Comanche Peak. Diablo Canyon. Palo Verde. San Onofre. South Texas Project. Wolf Creek Enclosure PG&E Letter DCL-11-073 CORE OPERATING LIMITS REPORTS (COLR) DIABLO CANYON POWER PLANT UNIT 2, CYCLE 17 EFFECTIVE DATE May 18, 2011

      • ISSUED FOR USE BY: DATE: EXPIRES: *** ----------------

PACIFIC GAS AND ELECTRIC COMPANY NUMBER COLR 2 NUCLEAR POWER GENERATION REVISION 6 DIABLO CANYON POWER PLANT CORE OPERATING LIMITS REPORT PAGE UNIT 1 OF 13 TITLE: COLR for Diablo Canyon Unit 2 2 05/18/11 EFFECTIVE DATE PROCEDURE CLASSIFICATION:

QUALITY RELATED 1. CORE OPERATING LIMITS REPORT 1.1 This Core Operating Limits Report (COLR) for Diablo Canyon Unit 2 Cycle 17 has been prepared in accordance with the requirements of Technical Specification (TS) 5.6.5. 1.2 The Technical Specifications affected by this report are listed below:

  • 3.1.1
  • 3.1.3
  • 3.1.4
  • 3.1.5
  • 3.1.6
  • 3.1.8
  • 3.2.1
  • 3.2.2 --------Shutdown Margin (MODE 2 with keff < 1.0, MODES 3, 4, and 5) Moderator Temperature Coefficient Rod Group Alignment Limits Shutdown Bank Insertion Limits Control Bank Insertion Limits PHYSICS TESTING Exceptions

-MODE 2 Heat Flux Hot Channel Factor -FQ(Z) Nuclear Enthalpy Rise Hot Channel Factor -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 COLR_2u2r06.DOC 04B 0517.0808 PACIFIC GAS AND ELECTRIC COMPANY DIABLO CANYON POWER PLANT TITLE: COLR for Diablo Canyon Unit 2 2. OPERATING LIMITS NUMBER COLR 2 REVISION 6 PAGE 2 OF 13 UNIT 2 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 with Safety Injection enabled shall be greater than or equal to 1.6%

2.1.2 In MODES 3 or 4 the shutdown margin with Safety Injection blocked shall be greater than or equal to 1.6%

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%

However, an administrative value of 1.6 %

will be used to address concerns of NSAL-02-014.

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 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 (all rods withdrawn, RATED THERMAL POWER condition).

2.2.3 The MTC 60 ppm surveillance limit is -3.72x10-4 (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. COLR_2u2r06.DOC 04B 05l7.0808 PACIFIC GAS AND ELECTRIC COMPANY DIABLO CANYON POWER PLANT NUMBER COLR 2 REVISION 6 PAGE 3 OF 13 TITLE: COLR for Diablo Canyon Unit 2 UNIT 2 2.5 Heat Flux Hot Channel Factor -FQ(Z) (TS 3.2.1) F RTP 2.5.1 forP>0.5 -P F RTP

-0.5 where: P

=2.58 K(Z) 1.0 THERMAL POWER RATED THERMAL POWER NOTE: The W(Z) data is appropriate for use only if the predicted axial offset is within +/-3 % of the measured value. 2.5.2 The W(Z) data for Relaxed Axial Offset Control (RAOC) operation, provided in Tables 2A and 2B are sufficient to determine the RAOC W(Z) versus core height for Cycle 17 bumups through the end of full power reactivity plus a power coast down of up to 1000 MWDIMTU. COLR_2u2r06.DOC 04B For W(Z) data at a desired bumup not listed in the table, but less than the maximum listed bumup, values at 3 or more bumup steps should be used to interpolate the W(Z) data to the desired bumup with a polynomial type fit that uses the W(Z) data for the nearest three bumup steps. For W(Z) data at a desired bumup outside of the listed bumup steps, a linear extrapolation of the W(Z) data for the nearest two bumup steps can be used. If data are listed for only 2 bumup steps, a linear fit can be used for both interpolation and extrapolation.

The W(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 W(Z) values must be increased by the factor lIP (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. 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 F (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. 0517.0808 PACIFIC GAS AND ELECTRIC COMPANY DIABLO CANYON POWER PLANT NUMBER COLR 2 REVISION 6 PAGE 4 OF 13 TITLE: COLR for Diablo Canyon Unit 2 UNIT 2 2.5.3 FQ(Z) shall be evaluated to determine if it is within its limits by verifying that F g (Z) and F (Z) satisfy the following:

COLR_2u2r06.DOC 04B a. Using the moveable inc ore 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:

F RTP *K(Z) Fe (Z) < Q for P > 0.5 Q p FRTP *K(Z) Fe (Z)::; Q for P ::; 0.5 Q 0.5 W F RTP F (Z) <-Q-*K(Z)

Q P for P > 0.5 F RTP F W Q (Z) ::;-Q-*K(Z) for P::; 0.5 0.5 where: F g (Z) is the measured F Q(Z) increased by the allowances for manufacturing tolerances and measurement uncertainty.

is the FQ limit K(Z) is the normalized F Q(Z) as a function of core height P is the relative THERMAL POWER, and F (Z) is the total peaking factor, F g (Z), multiplied by W(Z) which gives the maximum FQ(Z) calculated to occur in normal operation.

W (Z) is the cycle dependent function that accounts for power distribution transients encountered during normal operation.

and K(Z) are specified in 2.5.1 and W(Z) is specified in 2.5.2. 0517.0808 PACIFIC GAS AND ELECTRIC COMPANY DIABLO CANYON POWER PLANT TITLE: COLR for Diablo Canyon Unit 2 2.6 Nuclear Enthalpy Rise Hot Channel Factor -F (TS 3.2.2)

  • [1 + PF Llli * (I-P)] where: THERMAL POWER P RATED THERMAL POWER NUMBER COLR 2 REVISION 6 PAGE 5 OF 13 UNIT 2 F = Measured values of F obtained by using the moveable incore detectors to obtain a power distribution map. = 1.586 (prior to including 4% uncertainty)

PF Llli = 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, to be applied to the Nuclear Enthalpy Rise Hot Channel Factor, F shall be calculated by the following formula: U/ill U F/ill =1.0+--100.0 where: Ub.H Uncertainty for enthalpy rise as defined in equation (5-19) in Reference 6.2. However, if the uncertainty is less than 4.0, the uncertainty should be set equal to 4.0. F 1.65 for PDMS (in the above Section 2.6 equation).

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

100.0 where: U Q = Uncertainty for power peaking factor as defined in equation (5-19) in Reference 6.2. U e = Engineering uncertainty factor = 1.03 If the PDMS is inoperable, the Nuclear Enthalpy Rise Hot Channel Factor, 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. COLR_2u2r06.DOC 04B 0517.0808 PACIFIC GAS AND ELECTRIC COMPANY DIABLO CANYON POWER PLANT NUMBER COLR 2 REVISION 6 PAGE 6 OF 13 TITLE: COLR for Diablo Canyon Unit 2 UNIT 2 2.8 Axial Flux Difference (TS 3.2.3) 2.8.1 The Axial Flux Difference (AFD) Limits are provided in Figure 2. 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 and Temperature Departure from Nucleate Boiling (DNB) Limit (TS 3.4.1) 3. TABLES 2.1 0.1 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. NOTE: The DNB RCS T AVG 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. 3.1 Table 1, "FQ Margin Decreases in Excess of2% Per 31 EFPD" 3.2 Table 2A, "Load Follow W(Z) Factors at 150 and 5,000 MWDIMTU as a Function of Core Height" 3.3 Table 2B, "Load Follow W(Z) Factors at 12,000 and 22,000 MWDIMTU as a Function of Core Height" 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" 5. RECORDS None 6. REFERENCES 6.1 NF -PGE-11-17, Rev. 2, "Diablo Canyon Unit 2 Cycle 17 Reload Evaluation and Core Operating Limits Report, Revision 2", May, 2011 6.2 WCAP-12473-A (Non-Proprietary), "BEACON Core Monitoring and Operations Support System," August, 1994 COLR_2u2r06.DOC 04B 0517.0808 PACIFIC GAS AND ELECTRIC COMPANY DIABLO CANYON POWER PLANT TITLE: COLR for Diablo Canyon Unit 2 Table 1: FQ Margin Decreases in Excess of2% Per 31 EFPD Cycle Max. % Decrease Bumup in FQ Margin (MWDIMTU) 150 2.00 313 2.01 476 2.46 638 2.75 801 2.86 964 2.78 1127 2.54 1289 2.13 1452 2.00 6009 2.00 6172 2.33 6335 2.79 6497 2.69 6660 2.54 6823 2.38 6986 2.21 7148 2.03 7311 2.00 NUMBER COLR 2 REVISION 6 PAGE 7 OF 13 UNIT 2 NOTE: All cycle bumups 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 bumups. COLR_2u2r06.DOC 04B 0517.0808 PACIFIC GAS AND ELECTRIC COMPANY DIABLO CANYON POWER PLANT TITLE: COLR for Diablo Canyon Unit 2 NUMBER COLR 2 REVISION 6 PAGE 8 OF 13 UNIT 2 Table 2A: Load Follow W(Z) Factors at 150 and 5000 MWDIMTU as a Function of Core Height HEIGHT 150 MWDIMTU HEIGHT 5000 MWDIMTU (FEET) W(Z) (FEET) W(Z) *0.0000 1.4587 *0.0000 1.5386 *0.2000 1.4483 *0.2000 1.5339 *0.4000 1.4375 *0.4000 1.5252 *0.6000 1.4268 *0.6000 1.5141 *0.8000 1.4164 *0.8000 1.5005 1.0000 1.4043 1.0000 1.4837 1.2000 1.3899 1.2000 1.4639 1.4000 1.3741 1.4000 1.4414 1.6000 1.3574 1.6000 1.4168 1.8000 1.3398 1.8000 1.3905 2.0000 1.3214 2.0000 1.3629 2.2000 1.3025 2.2000 1.3343 2.4000 1.2830 2.4000 1.3052 2.6000 1.2632 2.6000 1.2758 2.8000 1.2433 2.8000 1.2465 3.0000 1.2218 3.0000 1.2181 3.2000 1.2044 3.2000 1.1990 3.4000 1.1977 3.4000 1.1937 3.6000 1.1960 3.6000 1.1903 3.8000 1.1939 3.8000 1.1870 4.0000 1.1906 4.0000 1.1831 4.2000 1.1864 4.2000 1.1783 4.4000 1.1811 4.4000 1.1726 4.6000 1.1750 4.6000 1.1660 4.8000 1.1679 4.8000 1.1587 5.0000 1.1606 5.0000 1.1506 5.2000 1.1513 5.2000 1.1421 5.4000 1.1432 5.4000 1.1328 5.6000 1.1508 5.6000 1.1216 5.8000 1.1597 5.8000 1.1214

  • Top and Bottom 8% Excluded COLR_2u2r06.DOC 04B 0517.0808 PACIFIC GAS AND ELECTRIC COMPANY DIABLO CANYON POWER PLANT TITLE: COLR for Diablo Canyon Unit 2 NUMBER COLR 2 REVISION 6 PAGE 9 OF 13 UNIT 2 Table 2A: Load Follow W(Z) Factors at 150 and 5000 MWDIMTU as a Function of Core Height (Continued)

HEIGHT 150MWDIMTU HEIGHT 5000 MWDIMTU (FEET) W(Z) (FEET) W(Z) 6.0000 1.1674 6.0000 1.1304 6.2000 1.1767 6.2000 1.1407 6.4000 1.1844 6.4000 1.1499 6.6000 1.1913 6.6000 1.1581 6.8000 1.1990 6.8000 1.1653 7.0000 1.2063 7.0000 1.1713 7.2000 1.2118 7.2000 1.1760 7.4000 1.2155 7.4000 1.1792 7.6000 1.2174 7.6000 1.1815 7.8000 1.2172 7.8000 1.1823 8.0000 1.2148 8.0000 1.1812 8.2000 1.2102 8.2000 1.1784 8.4000 1.2031 8.4000 1.1736 8.6000 1.1932 8.6000 1.1654 8.8000 1.1829 8.8000 1.1634 9.0000 1.1739 9.0000 1.1724 9.2000 1.1705 9.2000 1.1872 9.4000 1.1768 9.4000 1.1999 9.6000 1.1816 9.6000 1.2114 9.8000 1.1835 9.8000 1.2242 10.0000 1.1846 10.0000 1.2373 10.2000 1.1851 10.2000 1.2484 10.4000 1.1834 10.4000 1.2576 10.6000 1.1791 10.6000 1.2667 10.8000 1.1795 10.8000 1.2738 11.0000 1.1873 11.0000 1.2798 *11.2000 1.1971 *11.2000 1.2838 *11.4000 1.2031 *11.4000 1.2806 *11.6000 1.2032 *11.6000 1.2782 *11.8000 1.1962

  • 11.8000 1.2714 *12.0000 1.1893 *12.0000 1.2647
  • Top and Bottom 8% Excluded COLR _ 2u2r06.DOC 04B 0517.0808 PACIFIC GAS AND ELECTRIC COMPANY DIABLO CANYON POWER PLANT TITLE: COLR for Diablo Canyon Unit 2 NUMBER COLR 2 REVISION 6 PAGE 10 OF 13 UNIT 2 Table 2B: Load Follow W(Z) Factors at 12000 and 22000 MWDIMTU as a Function of Core Height HEIGHT 12000 MWDIMTU HEIGHT 22000 MWDIMTU (FEET) W(Z) (FEET) W(Z) *0.0000 1.2578 *0.0000 1.2827 *0.2000 1.2567 *0.2000 1.2861 *0.4000 1.2556 *0.4000 1.2853 *0.6000 1.2545 *0.6000 1.2817 *0.8000 1.2505 *0.8000 1.2752 1.0000 1.2438 1.0000 1.2660 1.2000 1.2353 1.2000 1.2553 1.4000 1.2258 1.4000 1.2442 1.6000 1.2157 1.6000 1.2332 1.8000 1.2051 1.8000 1.2224 2.0000 1.1942 2.0000 1.2117 2.2000 1.1829 2.2000 1.2011 2.4000 1.1715 2.4000 1.1906 2.6000 1.1602 2.6000 1.1802 2.8000 1.1469 2.8000 1.1684 3.0000 1.1430 3.0000 1.1636 3.2000 1.1440 3.2000 1.1645 3.4000 1.1442 3.4000 1.1728 3.6000 1.1439 3.6000 1.1821 3.8000 1.1440 3.8000 1.1939 4.0000 1.1455 4.0000 1.2058 4.2000 1.1486 4.2000 1.2157 4.4000 1.1504 4.4000 1.2239 4.6000 1.1513 4.6000 1.2301 4.8000 1.1516 4.8000 1.2345 5.0000 1.1501 5.0000 1.2366 5.2000 1.1497 5.2000 1.2379 5.4000 1.1559 5.4000 1.2453 5.6000 1.1696 5.6000 1.2661 5.8000 1.1837 5.8000 1.2869
  • Top and Bottom 8% Excluded COLR _ 2u2r06.DOC 04B 0517.0808 PACIFIC GAS AND ELECTRIC COMPANY DIABLO CANYON POWER PLANT TITLE: COLR for Diablo Canyon Unit 2 NUMBER COLR 2 REVISION 6 PAGE 11 OF 13 UNIT 2 Table 2B: Load Follow W(Z) Factors at 12000 and 22000 MWDIMTU as a Function of Core Height (Continued)

HEIGHT 12000 MWDIMTU HEIGHT 22000 MWDIMTU (FEET) W(Z) (FEET) W(Z) 6.0000 1.1976 6.0000 1.3039 6.2000 1.2118 6.2000 1.3192 6.4000 1.2242 6.4000 1.3318 6.6000 1.2349 6.6000 1.3418 6.8000 1.2439 6.8000 1.3491 7.0000 1.2508 7.0000 1.3532 7.2000 1.2557 7.2000 1.3545 7.4000 1.2592 7.4000 1.3534 7.6000 1.2605 7.6000 1.3490 7.8000 1.2594 7.8000 1.3411 8.0000 1.2558 8.0000 1.3295 8.2000 1.2494 8.2000 1.3145 8.4000 1.2403 8.4000 1.2960 8.6000 1.2331 8.6000 1.2739 8.8000 1.2315 8.8000 1.2587 9.0000 1.2334 9.0000 1.2492 9.2000 1.2399 9.2000 1.2372 9.4000 1.2436 9.4000 1.2241 9.6000 1.2455 9.6000 1.2223 9.8000 1.2444 9.8000 1.2236 10.0000 1.2433 10.0000 1.2261 10.2000 1.2440 10.2000 1.2294 10.4000 1.2422 10.4000 1.2355 10.6000 1.2410 10.6000 1.2464 10.8000 1.2401 10.8000 1.2651 11.0000 1.2407 11.0000 1.2865 *11.2000 1.2427

  • 11.2000 1.3015 *11.4000 1.2373 *11.4000 1.3069 *11.6000 1.2309 *11.6000 1.3003 *11.8000 1.2182 *11.8000 1.2800 *12.0000 1.2055 *12.0000 1.2599
  • Top and Bottom 8% Excluded COLR_2u2r06.DOC 04B 0517.0808 PACIFIC GAS AND ELECTRIC COMPANY DUffiLOCANYONPOWERPLANT TITLE: COLR for Diablo Canyon Unit 2 225 200 / 175 / 1/ -r:: 150 co L. "C J: .... § 125 en c. Q) .... (J) -r:: 100 0 E / I BANKe I / / / / 1 (0.0,98) 1 en 0 a.. / / 75 r:: CO m V 50 / / / / 25 / o /1 (0.138,0) 1 NUMBER COLR 2 REVISION 6 PAGE 12 OF 13 UNIT 2 / I (0.583, 225) I 1 (1.0, 188) 1/ / / / V / / V1BANKDI V Valid for Fully Withdrawn Rod Positions: 225 Steps and 231 Steps 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 COLR_2u2r06.DOC 04B 0517.0808 PACIFIC GAS AND ELECTRIC COMPANY DIABLO CANYON POWER PLANT TITLE: COLR for Diablo Canyon Unit 2 120 1(-14,100)1

(+10,100)

I --OPERATION

/ \ 100 / \ 80 a... CI) 0 a.. ca \ I \ ACCEPTABLE I I OPERATION I \ , NUMBER COLR 2 REVISION 6 PAGE 13 OF 13 UNIT 2 I UNACCEPTABLE OPERATION*

I E a... CI) .s:: 60 I \ I-"C CI) -cu 0::: I \ I , (5 1(-30,50)

I 1(+25,50)1 Q 40 20 o 50 30 10 0 1 0 20 30 40 50 60 Flux Difference (DELTA I) % Figure 2: AFD Limits as a Function of Rated Thermal Power COLR_2u2r06.DOC 04B 0517.0808

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