ML20057D071

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Cycle 10,COLSS & Cpcs Addressable Constants for Reduction of Operable Incore Detectors
ML20057D071
Person / Time
Site: Arkansas Nuclear Entergy icon.png
Issue date: 09/21/1993
From: Etemadi S
ABB COMBUSTION ENGINEERING NUCLEAR FUEL (FORMERLY, ASEA BROWN BOVERI, INC.
To:
Shared Package
ML20046D604 List:
References
A-93-026, A-93-26, NUDOCS 9310010063
Download: ML20057D071 (5)
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Text

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Enclosure 1 to A-93-026 Page 1 of 5 -

ANO-2 CYCLE 10 COLSS and CPCS Addressable Constants for Reduction of Operable Incore Detectors i

PREPARED BY:

l &% N1.' 9Itil93 Signature / Date S. Etemadi Author VERIFICATION STATUS The information contained in this document has been verified in accordance with the ABB Combustion Engineering Nuclear Fuel ouality Assurance Program.

/ Yes No ABB Combustion Engineering Nuclear Fuel A EDID pggggy 9310010063 930924 P PDR ADOCK 05000368 p PDR i;M

i j . 

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! l i j Enclosure 1 to l i A-93-026 Page 2 of 5 l , i J I As proposed by CE (Reference 1) and approved by Entergy/ANO, an analysis was

performed to determine the impact of a reduction in the number of operable- .

incore detectors on the ANO-2 Cycle 10 COLSS and CPCS addressable constants  ! transmitted in References 2 and 3. Reference 2 transmitted the original Cycle i 10 00LSS and CPCS addressable constants and Reference 3 provided the revised j BERR1 and BERR3 constants for reduced inlet temperature. i l ! The analysis considered Technical Specification incore detector failure limits i j of up to 50% along with a bounding 1% increase in the CECOR Fxy measurement  ! i uncertainty which is consistent with the analysis performed at Entergy  ! (Reference 4). The only addressable constants affected by this analysis are l j the COLSS EPOL2/4 and UNCERT constants and the CPCS BERR1 and BERR3 constants. All of the other addressable constants transmitted in Reference 2 remain  : unchanged. l The values of revised COLSS and CPCS addressable constants are given in Tables [ j 1 and 2, respectively.  ; ! As stated in Reference 1, the COLSS database constant K09 must be modified to  ! j incorporate the revised minimum number of operable incore detectors. It e i ! value of K09 for the 50% failure limit is 110. 1 J

The COLSS addressable constants listed in Table 1 are appropriate for use with  !

l the COLSS algorithms and database constants described in ANO-2 COLSS  ! ! Functional Design Requirements (References S and 6) and the COLSS Database  : 1 Document for ANO-2 Cycle 10 (Reference 7), provided the appropriate value of '

! K09 is incorporated.  ;

The CPCS addressable constants listed in Table 2 are consistent with the Functional Design Requirements described in References 8 and 9, and the l

database constants listed in Reference 10.

1 i Please note that all the assumptions, requirements, and guidelines specified in References 2 and 3 remain effective. I J J Y l 

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                            .                                                                                      Enclosure 1 to              '

A-93-026 l Page 3 of 5 .. l { l i l 1 Table 1 l ANO-2 Cycle 10 Current and Revised COLSS Addressable Constants j for a Reduced Number of Operable incore Detectors  ; I i Constant Description Value Current" 1 50 % i Failed j i UNCERT Uncertainty Factor for 1.09 1.11 . LHR POL f EPOL2/4 Uncertainty Factor for 0.11 0.12  ! DNBR POL f

  • Values come from Page A2-2 of Reference 2.  ;

i I Table 2 ANO-2 Cycle 10 Current and Revised CPC Addressable Constants  ; for a Reduced Number of Operable incore Detectors t Constant Description Value ( Current

  • 150% '

FaHed P l 6 BERR1 Power Uncertainty Factor Used in 1.21 1.22 } DNBR Calculation i BERR3 Power Uncertainty Factor Used in Local 1.25 1.26 i Power Density Calculation  ! 1

  • Values come from Page 2 of Reference 3.

I

~ Enclosure 1 to A-93-02G Page 4 of 5 . iferences:

1. D. R. Earles to F T. Philpott, " Proposal to Support Reduction of Operable Incore Detectors for ANO-2 Cycle 10 and Beyond," A-93-025, September 8, 1993.
2. D. R. Earles to F. T. Philpott, "ANO-2 Cycle 10 Final CPC/CEAC, COLSS and CEFAST Information," A-92-050, October 8, 1992.
3. D. R. Earles to F. T. Philpott, "ANO-2 Cycle 10 Revised BERR1 and BERR3 Values in CPC and Revised Planar Radial Peaks in CPC and COLSS,"

A-92-065, December 23, 1992.

4. R. B. Lang, "ANO-2 Cycle 10 CECOR Reliability Factors," 041-01;QR-220-18, CE0-93/00367, September 17, 1993.
5. " Functional Design Requirements for a Core Operating Limit Supervisory System (COLSS), "CE-NPSD-344-P, Revision 01-P, December 1986.
6. " Arkansas Nuclear ONE Unit 2 COLSS Functional Design Specification -

Plant Specific Supplement," CE-NPSD-352-P, Rev. 00-P, July 1986.

7. "ANO-2 COLSS Database Document," CE-NPSD-315, Rev. 05-P, October 1992.
8. " Functional Design Requirements for a Core Protection Calculator,"

CE-NPSD-335-P, Rev. 02-P, April 1988.

9. " Functional Design Requirements for a Control Element Assembly Calculator," CE-NPSD-336-P, Rev. 01-P, April 1988.
10. "AN0-2 CIP CPC and CEAC Database Listing," CE-NPSD-351-P, Revision 01-P, April 1988.

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Enclosure 1 to A-93-026 Page 5 of 5 Software Media Transfer Form f ACCL NO. 127 l CORE PROTECTION CALCULATOR SYSTEM ' ADDRESSABLE CONSTANTS AND 53FTWARE MEDIA TRANSFER FORM . l l A. Originator S. Etemaai Plant ANO-2 Cycle 10 Date September 21. 1993 i I B. Package Contents (C-E Windsor): Revised BERR1 and BERR3 values for reduction of operable incore l detectors  ; I l l C. Receipt of Change (NSSS Site):

1. Receipt of CPC Addressable Constants / Software media is acknowledged.

Name Date

2. The change has been reviewed and found acceptable, except as noted:
3. Please return to: Mr. M. A. Book CEP: 5318-GC28 1000 Prospect Hill Road Post Office Box 500 Windsor, CT 06095-0500 D. Acknowledgement of Receipt of Change (C-E Windsor):
1. ACCL Entries Completed Date NOTE: Originator to send copies of completed forms to all concerned C-E Engineering groups.
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