ML020870407

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Core Operating Limits Report, Cycle 21, Revision 0
ML020870407
Person / Time
Site: Prairie Island Xcel Energy icon.png
Issue date: 03/18/2002
From: Nazar M
Nuclear Management Co
To:
Document Control Desk, Office of Nuclear Reactor Regulation
References
Download: ML020870407 (24)
v • d • e


Text

NMc Commite to NuclearExceleme Nuclear Management Company, LLC Prairie Island Nuclear Generating Plant 1717 Wakonade Dr. East

  • Welch MN 55089 March 18, 2002 U S Nuclear Regulatory Commission Attn: Document Control Desk Washington, DC 20555 PRAIRIE ISLAND NUCLEAR GENERATING PLANT Docket No. 50-306 License No. DPR-60 Core Operating Limits Report for Prairie Island Unit 2 Cycle 21, Revision 0 The attached revision to the Core Operating Limits Report for Prairie Island Unit 2 Cycle 21, Revision 0, is being provided in accordance with the requirements of Technical Specification Section 6.6.E.4. The limits specified in the attached Core Operating Limits Report have been established using NRC approved methodology.

The Unit 2 Core Operating Limits Report has been revised to support refueling activities associated with Unit 2 Cycle 21.

We have made no new Nuclear Regulatory Commission commitments in this letter or the attachment. Please contact Gene Eckholt (651-388-1121) if you have any questions related to this report.

Mano K. Na r Site Vice Pr ident Prairie Isla Nuclear Generating Plant c: Regional Administrator - Region III, NRC Senior Resident Inspector, NRC 0 NRR Project Manager, NRC State of Minnesota - James Bernstein e J E Silberg

Attachment:

Core Operating Limits Report - Unit 2 Cycle 21, Revision 0

PRAIRIE ISLAND NUCLEAR GENERATING PLANT CORE OPERATING LIMITS REPORT UNIT 2 - CYCLE 21 REVISION 0 Note: This report is not part of the Technical Specifications This report is referenced in the Technical Specifications

PRAIRIE ISLAND NUCLEAR GENERATING PLANT CORE OPERATING LIMITS REPORT UNIT 2- CYCLE 21 REVISION 0 This report provides the values of the limits for Unit 2 Cycle 21 as required by Technical Specification Section 6.6.E. These values have been established using NRC approved methodology and are established such that all applicable limits of the plant safety analysis are met.

Heat Flux Hot Channel Factor Limits F0 R1= 2.40 K(z) values are provided in Figure 1.

V(z) values are provided in Figures 2a through 2f and Table I and Table 2.

Reference Technical Specification sections: 3.10.B. 1 and 3.10.B.2 Nuclear Enthalpy Rise Hot Channel Factor Limits F jRW= 1.77 PFDH = 0.3 If the nuclear enthalpy rise hot channel factor exceeds its limit in Technical Specification 3.1 0.B. 1, reduce reactor power and the high neutron flux trip setpoint by 3.33% for each percent that the measured nuclear enthalpy rise hot channel factor exceeds the 3.1 0.B. I limit.

Reference Technical Specification sections: 3.1 0.B. 1, 3.10.B.2, and 3.10.B.3 Page 1 of 22

Core Operating Limits Report Unit 2, Cycle 21 Revision 0 Linear Heat Generation Rate The 95% probability level ECCS analysis calculation utilized a peak linear heat generation rate of 14.788 kW/fi.

The Appendix K ECCS analysis calculation utilized a peak linear heat generation rate of 15.167 kW/ft for the FQ limit of 2.40.

Reference Technical Specification section: 3.10.B Axial Flux Difference Limits The axial flux difference limits are provided in Figure 3.

The axial flux difference target band is +/-5% when using figures 2a through 2e and Table 1. The axial flux difference target band is +5% when equal to or above 90% power and + 10% below 90% power when using figure 2f and Table 2.

Reference Technical Specification sections: 3.10.B.4 through 3.10.B.9 Shutdown Rod Insertion Limits The shutdown rods shall be fully withdrawn.

Reference Technical Specification section: 3.1O.D Control Rod Insertion Limits The control rod banks shall be limited in physical insertion as shown in Figures 4, 5, and 6.

Reference Technical Specification sections: 3.10.D and 3.10.G Reactor Coolant Flow Limit The reactor coolant system flow shall be > 178,000 gpm.

Reference Technical Specification section: 3.10.J Page 2 of 22

Core Operating Limits Report Unit 2, Cycle 21 Revision 0 Shutdown Margin Requirements Minimum Shutdown Margin requirements are shown in Table 3.

Reference Technical Specification Sections: Table TS. 1-1 and Specifications 3.10.A and 3.I0.D.3.

Penalty on F, for Small Break LOCA - K(z)

The small and large break LOCA analyses performed for this cycle are valid for FQ < 2.80 and F0

< 2.40, respectively. The FQ limit for the large break LOCA analysis is more limiting than the FQ limit for the small break LOCA analysis. The small break LOCA analysis incorporates the K(z) methodology. However, since the small break LOCA is less limiting than the large break LOCA, no K(z) penalty needs to be applied to calculations of most limiting FQ values. Thus for the equation in Technical Specification 3.10.B, K(z) is equal to 1. K(z) is shown graphically in Figure 1.

Transient Power Distribution Penalty for F - V(z)

Table 1 summarizes the bounding V(z) values for the middle 80% of the core for Prairie Island unit 2, cycle 21 with an operating band of+ 5% Al. The V(z) penalty takes the form of straight lines connecting data points determined as a function of core height. A particular V(z) curve is valid over a given exposure range and equilibrium axial offset range as noted in Table 1. The V(z) penalty for each exposure and axial offset range is shown graphically in Figures 2a - 2e.

An alternate two tier V(z) curve is presented in Table 2 and figure 2f. The operating band is

+5% Al at or above 90% power, and + 10% Al below 90% power. This figure is valid over all exposure ranges.

Page 3 of 22

Core Operating Limits Report Unit 2, Cycle 21 Revision 0 Table 1 Bounding V(z) Values Exposure Range z(ft) V(z) z(ft) V(z) 0.0 - 2.000 GWd/MTU 0.20 1.000 6.30 1.060 Eq AO range: -3% to +8% 0.39 1.000 6.49 1.056 Operating band: +/-5% Al 0.59 1.000 6.69 1.052 (Startup) 0.79 1.000 6.89 1.050 0.98 1.000 7.08 1.049 1.18 1.100 7.28 1.048 1.38 1.095 7.48 1.048 1.57 1.089 7.67 1.049 1.77 1.084 7.87 1.051 1.97 1.079 8.07 1.055 2.16 1.075 8.26 1.059 2.36 1.072 8.46 1.061 2.56 1.069 8.66 1.063 2.75 1.067 8.85 1.065 2.95 1.065 9.05 1.067 3.15 1.064 9.25 1.069 3.34 1.063 9.44 1.070 3.54 1.062 9.64 1.072 3.74 1.061 9.84 1.074 3.93 1.061 10.03 1.076 4.13 1.061 10.23 1.079 4.33 1.062 10.43 1.081 4.52 1.064 10.62 1.083 4.72 1.066 10.82 1.086 4.92 1.067 11.02 1.000 5.11 1.067 11.21 1.000 5.31 1.067 11.41 1.000 5.51 1.067 11.61 1.000 5.70 1.066 11.80 1.000 5.90 1.065 12.00 1.000 6.10 1.063 Page 4 of 22

Core Operating Limits Report Unit 2, Cycle 21 Revision 0 Table 1 Bounding V(z) Values Exposure Range z(ft) V(z) z(ft) V(z) 2.000 - 4.000 GWd/MTU 0.20 1.000 6.30 1.060 Eq AO range: -3% to +6% 0.39 1.000 6.49 1.056 Operating band: +/-5% Al 0.59 1.000 6.69 1.052 0.79 1.000 6.89 1.050 0.98 1.000 7.08 1.049 1.18 1.100 7.28 1.048 1.38 1.095 7.48 1.050 1.57 1.089 7.67 1.052 1.77 1.084 7.87 1.055 1.97 1.079 8.07 1.059 2.16 1.075 8.26 1.062 2.36 1.072 8.46 1.064 2.56 1.069 8.66 1.066 2.75 1.067 8.85 1.068 2.95 1.065 9.05 1.069 3.15 1.064 9.25 1.071 3.34 1.063 9.44 1.072 3.54 1.062 9.64 1.073 3.74 1.061 9.84 1.075 3.93 1.061 10.03 1.077 4.13 1.061 10.23 1.079 4.33 1.062 10.43 1.081 4.52 1.064 10.62 1.083 4.72 1.066 10.82 1.086 4.92 1.067 11.02 1.000 5.11 1.067 11.21 1.000 5.31 1.067 11.41 1.000 5.51 1.067 11.61 1.000 5.70 1.066 11.80 1.000 5.90 1.065 12.00 1.000 6.10 1.063 Page 5 of 22

Core Operating Limits Report Unit 2, Cycle 21 Revision 0 Table 1 Bounding V(z) Values Exposure Range z(ft) V(z) z(ft) V(z) 4.000 - 8.000 GWd/MTU 0.20 1.000 6.30 1.061 Eq AO range: -4% to +4% 0.39 1.000 6.49 1.058 Operating band: +/-5% Al 0.59 1.000 6.69 1.055 0.79 1.000 6.89 1.056 0.98 1.000 7.08 1.057 1.18 1.100 7.28 1.059 1.38 1.095 7.48 1.062 1.57 1.089 7.67 1.065 1.77 1.084 7.87 1.067 1.97 1.080 8.07 1.070 2.16 1.077 8.26 1.072 2.36 1.074 8.46 1.073 2.56 1.071 8.66 1.074 2.75 1.068 8.85 1.075 2.95 1.066 9.05 1.075 3.15 1.064 9.25 1.075 3.34 1.063 9.44 1.076 3.54 1.062 9.64 1.076 3.74 1.061 9.84 1.077 3.93 1.061 10.03 1.079 4.13 1.061 10.23 1.080 4.33 1.062 10.43 1.082 4.52 1.064 10.62 1.083 4.72 1.066 10.82 1.086 4.92 1.067 11.02 1.000 5.11 1.067 11.21 1.000 5.31 1.067 11.41 1.000 5.51 1.067 11.61 1.000 5.70 1.066 11.80 1.000 5.90 1.065 12.00 1.000 6.10 1.063 Page 6 of 22

Core Operating Limits Report Unit 2, Cycle 21 Revision 0 Table 1 Bounding V(z) Values Exposure Range z(ft) V(z) z(ft) V(z) 8.000 - 13.000 GWd/MTU 0.20 1.000 6.30 1.065 Eq AO range: -6% to +2% 0.39 1.000 6.49 1.069 Operating band: +/-5% Al 0.59 1.000 6.69 1.074 0.79 1.000 6.89 1.077 0.98 1.000 7.08 1.080 1.18 1.109 7.28 1.083 1.38 1.106 7.48 1.085 1.57 1.102 7.67 1.087 1.77 1.099 7.87 1.087 1.97 1.097 8.07 1.087 2.16 1.095 8.26 1.087 2.36 1.091 8.46 1.086 2.56 1.088 8.66 1.084 2.75 1.084 8.85 1.083 2.95 1.079 9.05 1.083 3.15 1.074 9.25 1.083 3.34 1.070 9.44 1.083 3.54 1.066 9.64 1.082 3.74 1.062 9.84 1.084 3.93 1.061 10.03 1.086 4.13 1.061 10.23 1.089 4.33 1.062 10.43 1.091 4.52 1.064 10.62 1.093 4.72 1.066 10.82 1.095 4.92 1.067 11.02 1.000 5.11 1.067 11.21 1.000 5.31 1.067 11.41 1.000 5.51 1.067 11.61 1.000 5.70 1.067 11.80 1.000 5.90 1.066 12.00 1.000 6.10 1.065 Page 7 of 22

Core Operating Limits Report Unit 2, Cycle 21 Revision 0 Table 1 Bounding V(z) Values Exposure Range z(ft) V(z) z(ft) V(z) 13.000 - EOC GWd/MTU 0.20 1.000 6.30 1.091 Eq AO range: -6% to +4% 0.39 1.000 6.49 1.094 Operating band: +/-5% Al 0.59 1.000 6.69 1.096 0.79 1.000 6.89 1.096 0.98 1.000 7.08 1.095 1.18 1.150 7.28 1.095 1.38 1.148 7.48 1.096 1.57 1.148 7.67 1.097 1.77 1.146 7.87 1.097 1.97 1.140 8.07 1.095 2.16 1.134 8.26 1.094 2.36 1.126 8.46 1.090 2.56 1.119 8.66 1.087 2.75 1.111 8.85 1.085 2.95 1.105 9.05 1.084 3.15 1.098 9.25 1.083 3.34 1.092 9.44 1.087 3.54 1.084 9.64 1.091 3.74 1.076 9.84 1.094 3.93 1.073 10.03 1.098 4.13 1.070 10.23 1.101 4.33 1.069 10.43 1.102 4.52 1.071 10.62 1.102 4.72 1.073 10.82 1.104 4.92 1.074 11.02 1.000 5.11 1.076 11.21 1.000 5.31 1.077 11.41 1.000 5.51 1.079 11.61 1.000 5.70 1.081 11.80 1.000 5.90 1.085 12.00 1.000 6.10 1.088 Page 8 of 22

Core Operating Limits Report Unit 2, Cycle 21 Revision 0 Table 2 Bounding V(z) Values Exposure Range z(ft) V(z) z(ft) V(z)

BOC to EOC 0.20 1.000 6.30 1.164 Eq AO range: -6% to +4% 0.39 1.000 6.49 1.167 Operating Band 0.59 1.000 6.69 1.170

+5% Al at and above 90% power 0.79 1.000 6.89 1.169

+/-10% Al below 90% power 0.98 1.000 7.08 1.167 1.18 1.282 7.28 1.164 1.38 1.279 7.48 1.157 1.57 1.277 7.67 1.150 1.77 1.275 7.87 1.141 1.97 1.264 8.07 1.131 2.16 1.253 8.26 1.122 2.36 1.240 8.46 1.124 2.56 1.226 8.66 1.127 2.75 1.212 8.85 1.130 2.95 1.201 9.05 1.135 3.15 1.190 9.25 1.140 3.34 1.179 9.44 1.144 3.54 1.166 9.64 1.148 3.74 1.154 9.84 1.152 3.93 1.141 10.03 1.155 4.13 1.127 10.23 1.159 4.33 1.120 10.43 1.160 4.52 1.126 10.62 1.160 4.72 1.131 10.82 1.163 4.92 1.135 11.02 1.000 5.11 1.138 11.21 1.000 5.31 1.143 11.41 1.000 5.51 1.147 11.61 1.000 5.70 1.152 11.80 1.000 5.90 1.156 12.00 1.000 6.10 1.160 Page 9 of 22

Core Operating Limits Report Unit 2, Cycle 21 Revision 0 Table 3 Minimum Required Shutdown Margin Number of Charging Pumps Running**

0-1 Pump 2 Pumps 3 Pumps Mode 1* 2.0% 2.0% 2.0%

Mode 2* 2.0% 2.0% 2.0%

Mode 3, Tave ->520°F 2.0% 2.0% 2.0%

Mode 3, 350°F Tave < 520°F 2.0% 2.0% 2.0%

Mode 4 2.0% 4.0% 6.0%

Mode 5*** 2.0% 5.26% 7.0%

Mode 6, ARI*** 5.26% 5.26% 7.0%

Mode 6, ARO*** 5.26% 6.0% 9.0%

For Modes 1 and 2, minimum shutdown margin requirements are provided by the Rod Insertion Limits.

    • Charging pump(s) in service only pertains to steady state operations. It does not include transitory operations. For example, operations such as starting a second charging pump in order to secure the operating pump would fall under the one pump in service column.

Values for modes 5 and 6 are also applicable for the Unit 2 Cycle 20 end of cycle.

Page 10 of 22

Core Operating Limits Report Unit 2, Cycle 21 Revision 0 1.2 1.1 1.0 0.9 0.8 0.7 K(z) 0.6 0.5 0.4 0.3 0.2 0.1 0.0 0 2 4 6 8 10 12 Core Height (ft)

Figure 1: Hot Channel Factor Normalized Operating Envelope Page 11 of 22

Core Operating Limits Report Unit 2, Cycle 21 Revision 0 1.11 I

0 - 2.000 GWd/MTU 1.10 Eq AO range: -3% to +8%

Operating Band: +/-5% Al 1.09 1.08 V(z) 1.07 1.06 1.05 1.04 0 1 3 4 5 6 7 8 9 10 11 12 Core Height (ft)

Figure 2a: Bounding V(z) Values From 0 - 2.000 GWd/MTU (Startup)

Page 12 of 22

Core Operating Limits Report Unit 2, Cycle 21 Revision 0 1.110 1.100 2.000 - 4.000 GWd/MTU Eq AO range: -3% to +6%

Operating Band: +/-5% Al 1.090 1.080 V(z) 1.070 1.060 1.050 1.040 0 1 2 3 4 5 6 7 8 9 10 11 12 Core Height (ft)

Figure 2b: Bounding V(z) Values From 2.000 - 4.000 GWd/MTU Page 13 of 22

Core Operating Limits Report Unit 2, Cycle 21 Revision 0 1.110 1.100 4.000 - 8.000 GWd/MTU Eq AO range: -4% to +4%

Operating Band: +/-5% Al 1.090 1.080 V(z) 1.070 1.060 1.050 1.040 0 1 2 3 4 5 6 7 8 9 10 11 12 Core Height (ft)

Figure 2c: Bounding V(z) Values From 4.000 - 8.000 GWd/MTU Page 14 of 22

Core Operating Limits Report Unit 2, Cycle 21 Revision 0 1.120 1.110 1.100 1.090 V(z) 1.080 1.070 1.060 1.050 1.040 0 1 2 3 4 5 6 7 8 9 10 11 12 Core Height (ft)

Figure 2d: Bounding V(z) Values From 8.000 - 13.000 GWd/MTU Page 15 of 22

Core Operating Limits Report Unit 2, Cycle 21 Revision 0 1.180 1 160 1.140 13.000 - EOC GWd/MTU Eq AO range: -6% to +4%

Operating Band: +/-5% Al 1.120 V(z) 1.100 1.080 1.060 1.040 0 1 2 3 4 5 6 8 9 10 11 12 Core Height (ft)

Figure 2e: Bounding V(z) Values From 13.000 - EOC GWd/MTU Page 16 of 22

Core Operating Limits Report Unit 2, Cycle 21 Revision 0 1.30 "BOC - EOC Eq AO range: -6% to +4%

1.25 Operating Band:

"+/-5%Al at or above 90% power

+/-1 0% Al below 90% power 1.20 V(z) 1.15 1.10 1.05 0 1 2 3 4 5 6 7 8 9 10 11 12 Core Height (ft)

Figure 2f: Bounding V(z) Values 2 Tier band BOC - EOC Page 17 of 22

Core Operating Limits Report Unit 2, Cycle 21 Revision 0 120 T 110 100 Unacceptable Unacceptable 90 Operation Operation 80 70 60 50 [ Acceptabl 40 30 -t 0

0 20 0E 0 w-10 0 I 50 -40 -30 -20 -10 0 10 20 30 40 50 60 Deviation From Target Flux Difference Figure 3: Deviation From Target Flux Difference as a Function of Thermal Power Page 18 of 22

Core Operating Limits Report Unit 2, Cycle 21 Revision 0 0.00 0.20 0.40 ci ci C

0 LL 0.60 0.80 1.00 0 0.2 0.4 0.6 0.8 1 CORE POWER FRACTION Figure 4: Control Bank Insertion Limits Page 19 of 22

Core Operating Limits Report Unit 2, Cycle 21 Revision 0 0.0 0.2 C

W 0.4 LU z

0

< 0.6 0.8 1.0 0.0 0.2 0.4 0.6 0.8 1.0 CORE POWER FRACTION Figure 5: Insertion Limits 100 Step Overlap With One Bottomed Rod (Technical Specification 3.10.G.3)

Page 20 of 22

Core Operating Limits Report Unit 2, Cycle 21 Revision 0 0.0 0.2 n

UJ 0.4 r

w Uj C')

z z

0 C-

< 0.6 0.8 1.0 0.0 0.2 0.4 0-6 0.8 1.0 CORE POWER FRACTION Figure 6: Insertion Limits 100 Step Overlap With One Inoperable Rod (Technical Specification 3.10.G.4)

Page 21 of 22

Core Operating Limits Report Unit 2, Cycle 21 Revision 0 Prepared by:

Kevin Retzke Date Nuclear Analysis and Design Reviewed By: / 2-Date 2 H Oley Nelson Date PI Project Manager Nuclear Analysis and Design Reviewed By:

Jon Kapitz f Date Superintendent of Nuclear Engineering Prairie Island Reviewed By: /2 9/D2 Eugene E-kholt Date Licensing Supervisor Prairie Island Approved By:

Mano Nazarnd Date Site Vice President Prairie Island Page 22 of 22

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