ML20154J043
| ML20154J043 | |
| Person / Time | |
|---|---|
| Site: | North Anna  |
| Issue date: | 03/04/1986 |
| From: | Stewart W VIRGINIA POWER (VIRGINIA ELECTRIC & POWER CO.) |
| To: | Harold Denton, Rubenstein L Office of Nuclear Reactor Regulation |
| References | |
| 85-655B, NUDOCS 8603100450 | |
| Download: ML20154J043 (8) | |
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March 4, 1986 Mr. Harold R. Denton, Director Serial No. 85-655B Office of Nuclear Reactor Regulation N0/EJL/ ace Atta: Mr. Lester S. Rubenstein, Director Docket No. 50-339 PWR Project Directorate #2 License No. NPF-7 Division of PWR Licensing-A U.S. Nuclear Regulatory Commission Washington, D.C. 20555 Gentlemen:
VIRGINIA ELECTRIC AND POWER COMPANY NORTH ANNA POWER STATION UNIT 2 RELAXED POWER DISTRIBUTION CONTROL CORE SURVEILLANCE REPORT FOR CYCLE 5 In our letter dated January 16, 1986 (Serial No. 655A), we requested an amendment, in the the form of changes to the Technical Specifications, to Operating License No. NPF-7 for North Anna Power Station Unit 2.
These changes would allow us to implement Relaxed Power Distribution Control for North Anna Unit 2.
Enclosed as Attachment 3 to that letter was the Core Surveillance Report for North Anna Unit 2, Cycle 4.
The Core Surveillance Report provides information that is referenced by the proposed changes to the Technical Specifications.
As discussed with members of your staff, Unit 2 was shutdown for a refueling outage on February 20, 1986. Enclosed as Attachment 1 is the Core Surveillance Report for North Anna Unit 2 Cycle 5.
Thfs is being provided as additional information to our January 16, 1986 submittal.
This report contains the appropriate information for the Cycle 5 core for Relaxed Power Distribution Control. The information in the report was developed in accordance with our topical report VEP-NE-1, " Relaxed Power Distribution Control Methodology and Associated FQ Surveillance Technical Specifications," for the Cycle 5 core.
Very truly yours, n
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5 hL W. L. Stewart Attachment 1.
North Anna Unit 2, Cycle 5 RPDC Core Surveillance Report for FQ=2.20 b
.O 0603100450 060304 I Lp gDR ADOCK 0500gf
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F VimonwsA Es.actmic awn Powns Courawy r Ifr. llarOld D.. DentOn cc: Dr. J. Nelson Grace Regional Administrator NRC Region II Mr. Morris W. Branch NRC Senior Resident Inspector North Anna Power Station Mr. Charles Price Department of Health 109 Governor Street Richmond, Virginia 23219 Mr. I. eon B. Engle NRC North Anna Project Manager PWR Project Directorate #2 Division of PWR Licensing-A r
I Director, Office of Nuclear Reactor Regulation Attention: Chief, Reactor Systems Branch Division of PWR Licensing-A U.S. Nuclear Regulatory Commission l
Washington, D.C. 20555 l
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RPDC CORE SURVEII4ANCE REPORT
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NORTH ANNA UNIT 2 CYCLE 5 CORE SURVEILLANCE REPORT This Core Surveillance Report is provided in accordance with Section 6.9.1.7 of the North Anna Unit 2 Technical Specifications.
The burnup-dependent Cycle 5 N(z) function for Technical Specification 4.2.2.2 is shown in Figures 1-3.
N(z) was calculated according to the procedure of VEP-fE-i.
The N(z) function
- will be used to confirm that the heat flux hot channel factor, FQ(z), will be limited to the Technical Specifications values of FQ(z) ;5 2.20 K(z), P >0.5 and P
FQ(z) 1 4.40 K(z), P g 0.5.
The Cycle 5 Axial Flux Difference (AFD) limits for Technical Specification 3.2.1 are shown in Figure 4.
These limits were calculated according to the methods of VEP-NE-1 and are the same as the cycle 4 limits.
The limits on Axial Flux Difference assure that the FQ(z) upper bound envelope is not exceeded during either normal operation or in the event of xenon redistribution following power changes.
- The N(z) function, when applied to a power distrioution measured under equilibrium conuitions, demonstrates that the initial conditions assumed in the LOCA analysis are met, along with the ECCS acceptance criteria of 10CFR50.46.
84R629RCA207
N(Z) FUNCTION TOP AND BOTTOM 15% EXCLUDED NORTH ANNA UNIT 2 CYCLE 5 AS PER TECHNICAL SPECIFICATION 4.2.2.2.G BURNUPS 0-7,000 MWD /MTU HEIGHT N(Z) 1.5 (FEET) 0.19 0.56 0.94 1.31 1.69 g
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2.44 1.283 3
2.81 1.255 p.
3.19 1.224 h"
3.56 1.210 3.94 1.193 p
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4.31 1.183 1
4.69 1.169 g
5.06 1.155 X
5.44 1.170 D
I 5.81 1.183 6.19 1.189 j9 6.56 1.203 gy
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6.94 1.221 w
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7.31 1.229 p
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L 8.06 1.209 3
8.44 1.184 8.81 1.173 o
9.19 1.160 g,g p-9.56 1.159 9.94 1.161 10.31 10.69 11.05 11.44 11.81 I
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8 16 12 EEN Figure 1 - N(Z) Function for N2C5 from 0-7000 MWD /MTU Burnup
N(Z) FUNCTION TOP AND BOTTOM 15% EXCLUDED NORTH ANNA UNIT 2 CYCLE 5 AS PER TECHNICAL SPECIFICATION 4.2.2.2.G BURNUPS BETWEEN 7,000 AND 14,500 MWD /MTU HEIGHT N(Z) 13 (FEET) 0.19 0.56 1
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1.31 1.69 g
1.4 2.06 1.204 R
2.44 1.188 3
2.81 1.169 3.19 1.161 a
3.56 1.164 3.94 1.165 i
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7.69 1.236 g
8.06 1.222 g
8.44 1.196 g
8.81 1.179 o
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I le 12 ggg Figure 2 - N(Z) Function for N2C5 from 7000-14,500 fMD/MTU Burnup
n-N(Z) FUNCTION TOP AND BOTTOM 15% EXCLUDED NORTH ANNA UNIT 2 CYCLE 5 AS PER TECHNICAL SPECIFICATION 4.2.2.2.G BURNUPS GREATER THAN 14,500 MWD /MTU
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HEIGHT N(Z) 1.5 (FEET) 0.19 0.56 0.94 1.31 1.69 g
1.4 2.06 1.204 N
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l 2.81 1.169 3.19 1.161 h"
3.56 1.151 3.94 1.155 4.31 1.156 p
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5.06 1.146 X
5.44 1.157 p
5.81 1.178 M
6.19 1.209 I
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Figure 3 - N(Z) Function for N2C5 Af ter 14,500 MWD /MTU Burnup
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