ML030720049

Attachment to Safety Evaluation Re Amendment No. 165, Implement a Core Operating Limits Report

ML030720049
Person / Time
Site:	Kewaunee
Issue date:	03/11/2003
From:	Office of Nuclear Reactor Regulation
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ML030710424	List: ML030700456 ML030720049 ML030720061
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Download: ML030720049 (12)

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TRM 2. 1 Kewaunee Nuclear Power Plant CORE OPERATING LIMITS REPORT (COLR)

CYCLE 25 REVISION 0

KEWAUNEE NUCLEAR POWER PLANT TRM 2.1 TECHNICAL REQUIREMENTS MANUAL Revision 0 DRAFT CORE OPERATING LIMI1TS REPORT CYCLE 25 1.0 CORE OPERATING LIMITS REPORT This Core Operating Limits Report (COLR) for Kewaunee Nuclear Power Plant (KNPP) has been prepared in accordance with the requirements of Technical Specification (TS) 6.9.4.

A cross-reference between the COLR sections and the KNPP Technical Specifications affected by this report is given below:

COLR KNPP Description Section TS 2.1 2.1 Reactor Core Safety Limits 2.2 3.10.a Shutdown Margin 2.3 3.1.f.3 Moderator Temperature Coefficient 2.4 3.10.d.1 Shutdown Bank Insertion Limit 2.5 3.10.d.2 Control Bank Insertion Limits 2.6 3.10.b.1.A Heat Flux Hot Channel Factor (FQ(Z))

3.10.b.4 3.1 0.b.5.C.i 2.7 3.10.b.1.B Nuclear Enthalpy Rise Hot Channel Factor (FNH) 2.8 3.10.b.9 Axial Flux Difference (AFD) 3.10.b.1 1.A 2.9 2.3.a.3.A Overtemperature AT Setpoint 2.10 2.3.a.3.B Overpower AT Setpoint 2.11 3.10.k RCS Pressure, Temperature, and Flow Departure from Nucleate Boiling 3.10.1 (DNB) Limits 3.10.m.1 2.12 3.8.a.5 Refueling Boron Concentration Figure 1 Safety Limits-Reactor Core Figure 2 Required Shutdown Margin Figure 3 K(Z) Normalized Operating Envelope Figure 4 Control Bank Insertion Limits Figure 5 V(Z) as a Function of Core Height Cycle 25 Page 2 of 12 Rev. 0

KEWAUNEE NUCLEAR POWER PLANT TRM 2.1 TECHNICAL REQUIREMENTS MANUAL Revision 0 DRAFT CORE OPERATING LIMITS REPORT CYCLE 25 2.0 Operatinq Limits The cycle-specific parameter limits for the specifications listed in Section 1.0 are presented in the following subsections. These limits have been developed using the NRC approved methodologies specified in Technical Specification 6.9.a.4 2.1 Reactor Core Safety Limits The combination of rated power level, coolant pressure, and coolant temperature shall not exceed the limits shown in COLR Figure 1. The safety limit is exceeded ifthe point defined by the combination of Reactor Coolant System average temperature and power level is at any time above the appropriate pressure line 2.2 Shutdown Marqin 2.2.1 When the reactor is subcritical prior to reactor startup, the SHUTDOWN margin shall be at least that shown in COLR Figure 2.

2.3 Moderator Temperature Coefficient 2.3.1 When the reactor is critical and _<60% RATED POWER, the moderator temperature coefficient shall be _ 5.0 pcm/°F, except during LOW POWER PHYSICS TESTING. When the reactor is > 60% RATED POWER, the moderator temperature coefficient shall be zero or negative.

2.3.2 The reactor will have a moderator temperature coefficient no less negative than -8 pcm/°F for 95% of the cycle time at full power.

2.4 Shutdown Bank Insertion Limit 2.4.1 The shutdown rods shall be fully withdrawn when the reactor is critical or approaching criticality 2.5 Control Bank Insertion Limit 2.5.1 The control banks shall be limited in physical insertion; insertion limits are shown in COLR Figure 4 Cycle 25 Page 3 of 12 Rev. 0

KEWAUNEE NUCLEAR POWER PLANT TRM 2.1 TECHNICAL REQUIREMENTS MANUAL Revision 0 DRAFT CORE OPERATING LIMITS REPORT CYCLE 25 2.6 Nuclear Heat Flux Hot Channel Factor (Fo N(Z))

2.6.1 F0 N(Z) Limits for FRA-ANP Fuel FaN(Z) X 1.03 x 1.05 < (2.35)/P x K(Z) for P > 0.5 [Hvy]

F0 N(Z) x 1.03 x 1.05 < (4.70) x K(Z) for P *0.5 [Hvy]

FaN(Z) x 1.03 x 1.05 < (2.28)/P x K(Z) for P > 0.5 [Std]

F0 N(Z) x 1.03 x 1.05 < (4.56) x K(Z) for P _ 0.5 [Std]

where:

P is the fraction of full power at which the core is OPERATING K(Z) is the function given in Figure 3 Z is the core height location for the FQ of interest 2.6.2 The measured FQEQ(Z) hot channel factors under equilibrium conditions shall satisfy the following relationship for the central axial 80% of the core for FRA ANP fuel:

FaEQ(Z) X 1.03 x 1.05 x V(Z) _ (2.35)/P x K(Z) [Hvy]

FQEQ(Z) X 1.03 x 1.05 x V(Z) < (2.28)/P x K(Z) [Std]

where:

P is the fraction of full power at which the core is OPERATING V(Z) is defined in COLR Figure 5 FaEQ(Z) is a measured F0 distribution obtained during the target flux determination 2.6.3 The penalty factor for TS 3.10.b.5.C.i shall be 2%.

Cycle 25 Page 4 of 12 Rev. 0

KEWAUNEE NUCLEAR POWER PLANT TRM 2.1 TECHNICAL REQUIREMENTS MANUAL Revision 0 DRAFT CORE OPERATING LIMITS REPORT CYCLE 25 2.7 Nuclear Enthalpv Rise Hot Channel Factor (FAH^N) 2.7.1 FAHN Limits for FRA-ANP Fuel FAHN x 1.04 *1.70 [1 + 0.2(1-P)] [Hvy]

FAHN x 1.04*< 1.55 [1 + 0.2(1-P)] [Std]

where:

p is the fraction of full power at which the core is OPERATING 2.8 Axial Flux Difference (AFD) 2.8.1 The indicated axial flux target band shall be the area maintained within +/- 5%

about the target flux difference.

2.8.2 The envelope is an area whose outer limits are described by -10% and +10%

from the target axial flux difference at 90% rated power and increasing by

-1% and +1% from the target axial flux difference for each 2.7% decrease in rated power < 90% and > 50%.

Cycle 25 Page 5 of 12 Rev. 0

KEWAUNEE NUCLEAR POWER PLANT TRM 2.1 TECHNICAL REQUIREMENTS MANUAL Revision 0 DRAFT CORE OPERATING LIMITS REPORT CYCLE 25 2.9 Overtemperature AT Setpoint Overtemperature AT setpoint parameter values:

ATo = Indicated AT at RATED POWER, %

T = Average temperature, OF T' = 567.3 OF P = Pressurizer Pressure, psig P = 2235 psig K1 = 1.11 K2 = 0.0090 K3 = 0.000566 T = 30 seconds T2 = 4 seconds f(AI) = An even function of the indicated difference between top and bottom detectors of the power range nuclear ion chambers. Selected gains are based on measured instrument response during plant startup tests, where qt and qb are the percent power in the top and bottom halves of the core respectively, and qt + qb is total core power in percent of RATED POWER, such that (a) For qt - qb within -12, +9 %, f(AI) = 0 (b) For each percent that the magnitude of qt - qb exceeds +9 % the AT trip setpoint shall be automatically reduced by an equivalent of 2.5 % of RATED POWER.

(c) For each percent that the magnitude of qt - qb exceed -12 % the AT trip setpoint shall be automatically reduced byan equivalent of 1.5 % of RATED POWER.

2.10 Overpower AT Setpoint Overpower AT setpoint parameter values:

AT0 = Indicated AT at RATED POWER, %

T = Average temperature, OF T' = 567.3 OF K4 < 1.10 K5 > 0.0275 for increasing T; 0 for decreasing T K6 - 0.002 for T > T' ; 0 for T < T' "T = 10 seconds f(AI) = Same as in 2.9 Cycle 25 Page 6 of 12 Rev. 0

KEWAUNEE NUCLEAR POWER PLANT TRM 2.1 TECHNICAL REQUIREMENTS MANUAL Revision 0 DRAFT CORE OPERATING LIMITS REPORT CYCLE 25 2.11 RCS Pressure, Temperature, and Flow Departure from Nucleate Boiling (DNB)

Limits 2.11.1 During steady state power operation, Tavg shall be < 568.80 F.

2.11.2 During steady state power operation, Pressurizer Pressure shall be > 2205 psig 2.11.3 During steady state power operation, reactor coolant flow rate shall be

> 93,000 gpm per loop.

2.12 Refueling Boron Concentration 2.12.1 When there is fuel in the reactor, a minimum boron concentration of 2200 ppm and a shutdown margin of> 5% Ak/k shall be maintained in the Reactor Coolant System during reactor vessel head removal or while loading and unloading fuel from the reactor.

Cycle 25 Page 7 of 12 Rev. 0

KEWAUNEE NUCLEAR POWER PLANT TRM 2.1 TECHNICAL REQUIREMENTS MANUAL Revision 0 DRAFT CORE OPERATING LIMITS REPORT CYCLE 25 Figure 1 Safety Limits-Reactor Core 660 650 640 630 620 610 0

E LL 600 CU, 0

r.r_

a) 590 580 570 560 550 540 0 10 20 30 40 50 60 70 80 90 100 110 120 Percent Rated Core Power Cycle 25 Page 8 of 12 Rev. 0

KEWAUNEE NUCLEAR POWER PLANT TRM 2.1 TECHNICAL REQUIREMENTS MANUAL Revision 0 DRAFT CORE OPERATING LIMITS REPORT CYCLE 25 Figure 2 Required Shutdown Reactivity vs Boron Concentration 2000 1900 1800 1700 1600 1500 4-. 1400 C. 1300 Cu 1200 1100 "0) E. 1000 0.

C_

900 0"

800 700 600 500 400 300 200 100 0

0 200 400 600 800 1000 1200 1400 1600 1800 2000 Full Power Equilibrium Boron Concentration (ppm)

Cycle 25 Page 9 of 12 Rev. 0

KEWAUNEE NUCLEAR POWER PLANT TRM 2.1 TECHNICAL REQUIREMENTS MANUAL Revision 0 DRAFT CORE OPERATING LIMITS REPORT CYCLE 25 Figure 3 Hot Channel Factor Normalized Operating Envelope 1.2 1.1 (0,1.0) (6,1.0) 1 0.9 (12,0.925) 0.8 0.7 I I I 0.5 0.4 0.3 0.2 0.1 0

0 1 2 3 4 5 6 7 8 9 10 11 12 Core height (ft)

Cycle 25 Page 10 of 12 Rev. 0

KEWAUNEE NUCLEAR POWER PLANT TRM 2.1 TECHNICAL REQUIREMENTS MANUAL Revision 0 DRAFT CORE OPERATING LIMITS REPORT CYCLE 25 Figure 4 Control Bank Insertion Limits 0

z 0

U/)

z z

03 1-U/)

0n z

co 0 20 40 60 80 100 POER LE-VE % OF RATED PQAER Cycle 25 Page CeRof 12 Rev. 0

KEWAUNEE NUCLEAR POWER PLANT TRM 2.1 TECHNICAL REQUIREMENTS MANUAL Revision 0 DRAFT CORE OPERATIN4G LIMITS REPORT CYCLE 25 Figure 5 V(Z) as a Function of Core Height 1.18 1.16 1.14 1.12 1.1 V(Z) 1.08 1.06 1.04 1.02 1

0 2 4 6 8 10 12 CORE HEIGHT (FT)

Cycle 25 Page 12 of 12 Rev. 0