ML091410124

Monticello - Calculation CA-08-050, Rev. 0, Instrument Setpoint Calculation - Average Power Range Monitor (APRM) Non-Flow Eiased Prnm Setpoints for Cl Tp and EPU

ML091410124
Person / Time
Site:	Monticello
Issue date:	08/11/2008
From:	Balitski J Northern States Power Co, Xcel Energy
To:	Office of Nuclear Reactor Regulation
References
L-MT-09-026, TAC MD9990 CA-08-050, Rev 0
Download: ML091410124 (63)

Text

MONTICELLO NUCLEAR GENERATING PLANT 3494 TITLE: CALCULATION COVER SHEET Revision 17.I ,Page I of 1 Title Instrument Setpoint Calculation

-Average CA- 08 -050 Rev. 0 Power Range Monitor (APRM) Non-Flow Eiased PRNM Setpoints for CL TP and EPU 50.59 Screening not required.

Calculation is 10 CFR50.59 Screening or Evaluation No: submitted as part of LAR EC- 12899 Plant Impact Associated Reference(s):

from CA-08-050 Does this calculation:

YES NO Calc No(s),' Rev(s), Add(s)Supercede another calculation?

0 0 Ref QF-0549 (Calculation Signature Page, attached).

r Augment (credited by) another calculation?

Affect the Fire Protection El N If Yes, attach Form 3765 Program per Form 3765?Affect piping or supports?

El Z If Yes, attach Form 3544 Affect IST Program Valve or If Yes, inform IST Coordinator and provide copy of Pump Reference Values, and/or EL E calculation Acceptance Criteria?What systems are affected?DBD Section (if any): Topic Code (See Form 3805): Structure Code (See Form 3805): DBD-B.05.01, Neutron Monitoring System NIP Power Range Monitors RATE -Rerate/Power Uprate Other Comments: Section 9, Future Needs -List of impacted documents Prepared by: Q~G ~AtQ~Date: Print/Signattire

-_ L 0 ,! 0 'K M/cah T,1 MONTICELLO NUCLEAR GENERATING PLANT CA-08-050 Revision 0 Acronyms and Abbreviations Page 1 of 1 AL Loop Instrument Accuracy AFT As-Found Tolerance AFTL Loop As-Found Tolerance AGAF APRM Gain Adjustment Factor AL Analytical Limit ALT As-Left Tolerance ALTL Loop As-Left Tolerance APEAL Loop APRM Primary Element Accuracy APEAR Loop APRM Primary Element Accuracy Random APEAb APRM Primary Element Accuracy bias , APMAL Loop APRM Process Measurement Accuracy APRM Average Power Range Monitor AV Allowable Valve CL Loop Calibration Accuracy Error CLTP Current Limiting Thermal Power DL Loop Instrument Drift DPEAL Loop Drift Primary Element Accuracy DPEAR Loop Drift Primary Element Accuracy Random DTE Drift Temperature Effect DPEAb Drift Primary Element Accuracy bias EPU Expanded Power Uprate FS Full Span GEH GE-Hitachi Nuclear Energy IRM Intermediate Range Monitor LER Licensee Event Report LPRM Local Power Range Monitor NMS Neutron Monitoring System NTSP Nominal Trip Setpoint NUMAC Nuclear Measurement Analysis and Control OL Operational Limit P/C Plant Process Computer PEA Primary Element Accuracy PMA Process Measurement Accuracy PRNM Power Range Neutron Monitoring PRNMS Power Range Neutron Monitoring System RTP.. Rated Thermal Power SRM Startup Range Monitor STP Simulated Thermal Power STA Spurious Trip Avoidance MONTICELLO NUCLEAR GENERATING PLANT CA-08-050 Revision 0 Table of Contents Page 1 of 1 Item Descruiption Pages QF-0549 QF-0527 QF-0528 3494 Acronyms TOC Calculation Attachment 1 Attachment 2 Attachment 3 Attachment 4 Calculation Signature Sheet Design Review Checklist Design Review Comment Form Calculation Cover Sheet List of Acronyms and Abbreviations Table of Contents Body Setpoint Diagrams Input 4.2, GEH 0000-0077-9068 MNGP-PRNMS-APRM Calc 2008, Revision 2, March 2008 Input 4.3, GEH 0000-0081-6958 MNGP-PRNMS-APRM Calc 2008, Revision 0, March 2008 Input 4.12, Mathematics of Physics and Modern Engineering, 1966, I.S. Sokolnikoff and R.M. Redheffer 8 1 20 1 1 1 58 2 23 24 3 Total 142 Section Paae #2.3.4.5.6.7.7.1 7.2 7.3 7.4 7.5 8.9.PURPOSE METHODOLOGY ACCEPTANCE CRITERIA INPUTS REFERENCES ASSUMPTIONS ANALYSIS APRM NON-FLOW BIASED PRNM LICENSING SETPOINTS INSTRUMENT DEFINITION AND DEVICE UNCERTAINTY TERMS LOOP INSTRUMENT UNCERTAINTY EVALUATION PRNM -CLTP OPERATION SETPOINT EVALUATION PRNM -EPU OPERATION SETPOINT EVALUATION CONCLUSIONS FUTURE NEEDS 1 2 3 4 5 9 10 10 11 17 26 40 54 55 -l I -1.1 -...."I ---. 1I MONTICELLO NUCLEAR GENERATING PLANT CA-08-050 TITLE: Instrument Setpoint Calculation

-Revision 0 Average Power Range Monitor (APRM) Non-Flow Biased PRNM Setpoints for CLTP and EPU Page 1 of 58 1. PURPOSE This calculation provides design basis setpoint analysis for the Allowable Values (AV)and Nominal Trip Setpoints (NTSP) for the Power Range Neutron Monitoring (PRNM)APRM setpoints associated with the installation of EC 10856. EC-12899 documents the plant impact and configuration changes from the calculation.

The following setpoints are evaluated for PRNM CLTP and EPU operation in accordance with setpoint control program and NRC commitment M87051A:* APRM Neutron Flux -High Scram o APRM Neutron Flux -High (Setdown)

Scram o APRM Neutron Flux -High (Setdown)

Rod Block* APRM Downscale Rod Block The NUMAC PRNM retrofit is a digital neutron monitoring system that replaces the analog NIP System -Power Range Monitoring System. This calculation evaluates the above setpoints and determines the available margin based on PRNM retrofit uncertainty parameters for CLTP and EPU operation.

The PRNM retrofit affects the above setpoints as follows: 1. PRNM adds two new neutron monitoring setpoints for CLTP and EPU operation.

These are identified above as the APRM Neutron Flux -High (Setdown)

Scram and APRM Neutron Flux -High (Setdown)

Control Rod Block. The function of the setpoints is described in Section 7.1.2.2. The PRNM retrofit changes how thecurrent APRM Flow Referenced Neutron Flux -High High setpoint functions and changes the setpoint name. The existing APRM Flow Referenced Neutron Flux -High High setpoint is changed to a non-flow biased setpoint identified as APRM Neutron Flux -High Scram, which is independent of core recirculation flow. The function is described in Section 7.1.2.3. The APRM Downscale Rod Block is an existing CLTP setpoint.

The setpoint does not change for PRNM CLTP and EPU operation.

GEH setpoint documentation, Input 4.3, recommended a NTSP setpoint of 4.0 % RTP for EPU operation.

This calculation provides the design bases to use the existing CLTP NTSP setpoint of 3.5% RPT.This PRNM based neutron monitoring system (NMS) calculation supersedes calculations CA-05-153 (Reference 5.8) and CA-96-224 (Reference 5.7). Section 9 (Future Needs)describes the affect on these calculations due to PRNM implementation.

MONTICELLO NUCLEAR GENERATING PLANT CA-08-050 TITLE: Instrument Setpoint Calculation

-Revision 0 Average Power Range Monitor (APRM) Non-Flow Biased PRNM Setpoints for CLTP and EPU Page 2 of 58 In addition to the PRNM non-flow bias neutron monitoring setpoints identified above, the PRNM retrofit also creates new or changes other neutron monitoring setpoints.

For completeness of the PRNM affected NMS setpoints, the following neutron monitoring setpoints will be evaluated in other calculations:

-A. Calculation CA-08-051, Instrument Setpoint Calculation

-Rod Block Monitor (RBM) PRNM Setpoints for CLTP and EPU Operation, which includes the following sub-calculations:

o RBM Low Trip Setpoint (LTSP)o RBM Intermediate Trip Setpoint (ITSP)o RBM High Trip Setpoint (HTSP)B. Calculation CA-08-052, Instrument Setpoint Calculation

-Average Power Range Monitor (APRM) Flow Biased PRNM Setpoints for CLTP and EPU, which includes the following sub-calculations for Two Loop Operation (TLO) and Single Loop Operation (SLO): o APRM Simulated Thermal Power -High Scram (TLO)o APRM Simulated Thermal Power -High Scram (SLO)* APRM Simulated Thermal Power -High Rod Block (TLO)o APRM Simulated Thermal Power -High Rod Block (SLO)C. Calculation CA-08-053, Average Power Range Monitor (APRM) Recirc Flow Instrumentation Calibration for PRNM CLTP and EPU, which includes the following subsections: " Recirc Flow transmitter Gain Scaling o NUMAC Recirc Flow Grain Factor Equation for Procedure 1383 (Core Flow Measurement System Calibration).

Note: Procedure 1383 is to be renumbered to ISP-NIP-1383 under EC 10856.2. METHODOLOGY This calculation is performed in accordance with ESM-03.02-APP-1 (Input 4.1). ESM-03-02-APP-I setpoint methodology is based on the following documents:

General Electric Instrument Setpoint Methodology NEDC-31336 (input 4.11) and Setpoint Calculation Guidelines for the Monticello Nuclear Generating Plant, GE-NE-901-021-0492 (Input 4.13). The General Electric Setpoint Methodology is a statistically based methodology.

It recognizes thatmost of the uncertainties that affect instrument performance are subject to random behavior, and utilizes statistical (probability) estimates of the various uncertainties to achieve conservative, but reasonable, predictions of instrument channel uncertainties.

The objective of the statistical approach to setpoint calculations is to achieve a workable compromise between the need to ensure instrument trips when I--------.

-- .-- ----- ..~ ....... .-.- .....1 .... .

MONTICELLO NUCLEAR GENERATING PLANT CA-08-050 TITLE: Instrument Setpoint Calculation

-Revision 0 Average Power Range Monitor (APRM) Non-Flow Biased PRNM Setpoints for CLTP and EPU Page 3 of 58 appropriate, and the need to avoid spurious trips that may unnecessarily challenge safety systems or disrupt plant operation.

Drift Analysis:

This calculation uses GE specified drift parameters for the applicable PRNM equipment and for the existing LPRM detectors.

The uncertainties associated with the overall PRNMS including the LPRMs, APRMs and associated hardware are appropriately considered and consistent with NRC approved GE methodology in establishing the APRM setpoints.

The calculation uses GEH specified ALT and AFT tolerances to calculate loop uncertainty.

These parameters are specified in Inputs 4.2 and 4.3 (GE PRNM documentation) and were converted to a 2c- value in accordance with Engineering Standards Manual ESM-03.02-APP-I, Rev 4 (Input 4.1). In addition to ALT and AFT tolerances for loop uncertainty, Sections 7.3.1.3 and 7.3.1.4 evaluated AFT/ALT for digital PRNMS surveillance calibration.

The setpoints are numerical values stored in the digital hardwareand not subject to drift. The ALT and AFT values for the setpoint are the same as the trip setpoint.

Therefore, there is no tolerance band for the surveillance calibration test. Attachment 1, Setpoint Diagrams, states AFT/ALT tolerance will not be applied to surveillance calibration of the setpoints because PRNMS setpoints are digital and stored in PRNMS database.3. ACCEPTANCE CRITERIA The Scram Setpoint and Allowable Values should be such that the Analytical Limit (AL)will not be exceeded when all applicable instrumentation uncertainties are considered.

For the Allowable Value (AV), the minimum required margin is calculated and compared to the available margin, which is AL minus AV. For the Nominal Trip Setpoint (NTSP)evaluation, the minimum required margin is calculated and compared to the available margin, which is AL minus NTSP.For parameters that do not have AL, such as Setdown Scram and Rod block and Downscale Rod Block, the difference between the minimum required margins (AL to AV and AL to NTSP) constitute the minimum required margin between AV and NTSP. This minimum required margin is compared to the available margin, which is AV minus NTSP.For the Licensee Event Report (LER) Avoidance Test setpoint evaluation, sufficient margin is verified between the NTSP and AV setpoints to prevent an LER condition.

A Spurious Trip Avoidance (STA) setpoint evaluation is performed where applicable to assure that there is a reasonable probability that spurious trips will not occur using the selected setpoints.

MONTICELLO NUCLEAR GENERATING PLANT CA-08-050 TITLE: Instrument Setpoint Calculation

-Revision 0 Average Power Range Monitor (APRM) Non-Flow Biased PRNM Setpoints for CLTP and EPU Page 4 of 58 4. INPUTS 4.1 Engineering Standards Manual ESM-03.02-APP-I, Appendix I (GE Methodology Instrumentation

& Controls), Revision 4. The ESM provides plant specific guidance on the implementation of the General Electric guidelines (Input 4.13) and methodology (Input 4.11).4.2 GEH: 0000-0077-9068 MNGP-PRNMS-APRM Calc-2008, Revision 2, DRF: 0000-0076-1670, March 2008, Average Power Range Monitor Selected PRNM'Licensing Setpoints

-CLTP Operation (NUMAC). This is a GEH basis document for the digital PRNM equipment and includes setpoint functions and instrument uncertainties for PRNM CLTP operation.

This document is Attachment 2.4.3 GEH: 0000-0081-6958 MNGP-PRNMS-APRM Calc 2008, Revision 0, DRF: 0000-0081-4903, March 2008, Average Power Range Monitor Selected PRNM Licensing Setpoints

-EPU Operation (NUMAC). This is a GEH basis document for the digital PRNM equipment and includes setpoint functions and instrument uncertainties for PRNM EPU operation.

This document is Attachment 3.4.4 GEH-NE-0000-0076-2388, DRF 0000-0076-2387, Revision 1, MNGP PRNM Licensing Setpoints

-CLTP Operation, December 2007. This document discusses the setpoint changes needed to license PRNM for CLTP operation.

4.5 NEDC-3241OP-A, Volume 1 -Nuclear Measurement Analysis and Control Power Range Neutron Monitor (NUMAC PRNM) Retrofit Plus Option III Stability Trip Function, Licensing Topical Report, October 1995. The LTR was used to provide descriptions of the PRNM equipment.

Input and output signal data was obtained from this document.4.6 NEDC-32410P-A,..Volume 2 -Nuclear Measurement Analysis and Control Power Range Neutron Monitor (NUMAC PRNM) Retrofit Plus Option III Stability Trip Function, Licensing Topical Report, October 1995. The LTR was used to provide description of the PRNM equipment.

4.7 NEDC-3241 OP-A, Supplement I -Nuclear Measurement Analysis and Control Power Range Neutron Monitor (NUMAC PRNM) Retrofit Plus Option III Stability Trip Function, Licensing Topical Report, Supplement 1, November 1997. The LTR was usedto provide description of the PRNM equipment.

4.8 Task Report T0506, Revision 1, Project Task Report, NMC Monticello Nuclear Generating Plant Extended Power Uprate, Technical Specifications Setpoints, March 2008. This document provides PRNM CLTP and EPU setpoints addressed in this calculation.

... ...... ..

MONTICELLO NUCLEAR GENERA TINGPLANT CA-08-050 TITLE: Instrument Setpoint Calculation

-Revision 0 Average Power Range Monitor (APRM) Non-Flow Biased PRNM Setpoints for CLTP and EPU Page 5 of 58 4.9 Design Input Request (DIR) T0500, Rev 2, DRF 000-0040-9168, Neutron Monitoring System. This DIR provides design information on the LPRMs used for input to the PRNM equipment.

4.10 Specification 257HA594, Rev 1, Neutron Monitoring System, 1213/85.Specification provides information on LPRM detectors and the existing analog neutron monitoring system. This document provides design specifications for the LPRMs.4.11 NEDC-31336P-A, Class I11, General Electric Instrument Setpoint Methodology, September 1996. Setpoint equations are referenced from this document.4.12 I.S. Sokolnikoff and R.M. Redheffer, Mathematics of Physics and Modern Engineering, 1966. The equation for statistical averaging of inputs is referenced from this book. Pages are contained in Attachment 4.4.13 GE-NE-901-021-0492, DRF AOO-01 932-1, Setpoint Calculation Guidelines for the Monticello Nuclear Generating Plant, October 1992. This calculation references

• this document for the inclusion of bias for the Spurious Trip Avoidance (STA)calculation.

5. REFERENCES 5.1 GEH: 0000-0077-9068 MNGP-PRNMS-APRM Calc-2008, Revision 2, DRF: 0000-0076-1670, March 2008, Average Power Range Monitor Selected PRNM Licensing Setpoints

-CLTP Operation (NUMAC)5.2 GEH: 0000-0081-6958 MNGP-PRNMS-APRM Calc 2008, Revision 0, DRF: 0000-0081-4903, March 2008, Average Power Range Monitor Selected PRNM Licensing Setpoints

-EPU Operation (NUMAC)5.3 NEDC-32410-A, Volume I -Nuclear Measurement Analysis and Control Power Range Neutron Monitor (NUMAC PRNM) Retrofit Plus Option III Stability Trip Function, Licensing Topical Report, October1995.

5.4 NEDC-32410-A, Volume II -Nuclear Measurement Analysis and Control Power Range Neutron Monitor (NUMAC PRNM) Retrofit Plus Option III Stability Trip Function, Licensing Topical Report, October 1995.5.5 NEDC-32410-A, Supplement 1 -Nuclear Measurement Analysis and Control Power Range Neutron Monitor (NUMAC PRNM) Retrofit Plus Option III Stability Trip Function, Licensing Topical Report, Supplement 1, November 1997, MONTICELLO NUCLEAR GENERATING PLANT CA-08-050 TITLE: Instrument Setpoint Calculation

-Revision 0 Average Power Range Monitor (APRM) Non-Flow Biased PRNM Setpoints for CLTP and EPU Page 6 of 58 5.6 GEH-NE-0000-0076-2388, Revision 1, MNGP PRNM Licensing Setpoints

-CLTP Operation, December 2007 5.7 CA-96-224, Rev 1, Instrument Setpoint Calculation

-Average Power Range Monitor (APRM) Flow-Biased Upscale Scram and Rod Block.5.8 CA-96-153, Revision 0, Instrumentation Setpoint Calculation

-Average Power Range Monitor (APRM) Downscale CR Block..5.9 GE-NE-901-021-0492, DRF AOO-01932-1, Setpoint Calculation Guidelines for the Monticello Nuclear Generating Plant, October 1992.5.10 Monticello Nuclear Generating Plant Technical Specifications, as revised through Amendment 155. GAR 01146762 initiated to update Technical Specification in accordance with EC 10856 and calculation CA-08-050.

5.11 Monticello Nuclear Generating Plant Technical Requirements Manual (TRM), as revised through Revision 2. LAR 01128839 updates TRM in accordance with EC 10856 and calculation CA-08-050.

5.12 Regulation Guide 1.105, R3 -Instrument Setpoints for Safety-Related Instrumentation.

5.13 Task Report T0506, Revision 1, Project Task Report, NMC Monticello Nuclear Generating Plant Extended Power Uprate, Technical Specifications Setpoints, March 2008.5.14 NEDC-31336P-A, Class Ill, General Electric Instrument Setpoint Methodology,.September 1996.5.15 Procedure 0017, Revision 25, "APRM Heat Balance Calibration." This procedure is used to calibrate the APRM gains such that the absolute difference between the Average Power Range Monitor (APRM) channels and the calculated power is _ 2% RTP while operating at _> 25 % RTP.5.16 I.S. Sokolnikoff and-R.M. Redheffer, Mathematics of Physics and Modern Engineering, 1966 5.17 RIS 2006-17, NRC Staff Position on the Requirements of 10 CFR 50.36,"Technical Specifications," Regarding Limiting Safety System Settings During Periodic Testing and Calibration of Instrument Channels, August 24, 2006 MONTICELLO NUCLEAR GENERATING PLANT CA-08-050 TITLE: Instrument Setpoint Calculation

-Revision 0 Average Power Range Monitor (APRM) Non-Flow Biased PRNM Setpoints for CLTP and EPU Page 7 of 58 5.18 TSTF-493, Rev 3, Clarify Application of Setpoint Methodology for LSSS Functions.

Date of issue 18 Jan 08. Rev 3 is not approved.

Included as a reference document.5.19 EC 10856, Rev 0, EPU -Mod 4 -Neutron Monitoring System (PRNM)5.20 EC 12899, Rev 0, PRNMS Setpoint Calculations 050 (Non-Flow Biased Setpoints) 5.21 Specification 257HA594, Rev 1, Neutron Monitoring System, 1213/85.Specification provides information on LPRM detectors and the existing analog neutron monitoring system 5.22 Engineering Standards Manual ESM-03.02-APP-l, Appendix I (GE Methodology Instrumentation

& Controls), Revision 4 5.23 Procedure C.6-005-A-22, Rev 3, APRM Hi Hi INOP CH 1, 2, 3, is a flow-bias APRM Neutron Flux Hi Hi setpoint.

PRNM retrofit converts this setpoint to a non-flow bias APRM Neutron Flux High setpoint.

The PRNM APRM Neutron Flux High setpoint is part of this calculation.

C.6-005-A-22 will be revised under EC-10856.PCR 01129100.5.24 Procedure C.6-005-A-30, Rev 3, APRM Hi Hi INOP CH 4, 5, 6, is a flow-bias APRM Neutron Flux Hi Hi setpoint.

PRNM retrofit converts this setpoint to a non-flow bias APRM Neutron Flux High setpoint.

The PRNM APRM Neutron Flux High setpoint is part of this calculation.

C.6-005-A-30 will be revised under EC-10856.PCR 01133816.5.25 Procedure C.6-005-A-06, Rev 3, APRM Downscale, states a NTSP setpoint of 3.5% RTP. This is correct for the present neutron monitoring system. Even though the PRNM CLTP and EPU operation NTSP setpoints are 3.5 % RTP, the procedure does not address that the PRNM retrofit NTSP setpoints remain the same for CLTP and EPU operation.

PCR 01146778 initiated to revise procedure for EC 10856 and calculation CA-08-050.

5.26 Procedure C.6-005-A-03, Rev 1, Annunciator procedure for window 5-A-3.PRNMS adds a new rod withdraw block setpoint:

APRM Neutron Flux -High (Setdown)

Rod Block. PCR 01146750 initiated to revise procedure for EC 10856 and calculation CA-08-050.

MONTICELLO NUCLEAR GENERATING PLANT CA-08-050 TITLE: Instrument Setpoint Calculation

-Revision 0 Average Power Range Monitor (APRM) Non-Flow Biased PRNM Setpoints for CLTP and EPU Page 8 of 58 5.27 Procedure B.05.06-02, Rev 18, Operations Manual Section -Plant Protection System, specifies APRM Hi Hi and APRM Downscale and other setpoints.

This calculation evaluates the APRM Downscale Rod Block setpoints and documents the PRNM EPU change in this setpoint.

The APRM Hi Hi setpoint is flow biased and is PRNM changes this setpoint to non-flow bias APRM Neutron Flux High.B.05.06-02 will be revised under EC-10856 by PCR 01133455.5.28 DBD B5.1, Rev C, Design Bases Document for Neutron Monitoring System, discusses NMS setpoints, margin, uncertainty parameters such as drift, etc. This calculation validated certain NMS setpoints using the PRNM parameter uncertainties specified in GE documentation.

Changes will be made under GAR 1138038.5.29 Procedure 8211, Rev 2, APRM Calibration Readjustment for Single Loop, discusses APRM setpoint voltage adjustments including Downscale Rod Block, Hi-Hi Scram, etc. Changes have been made by PRNM and this calculation evaluates the non-flow biased PRNM setpoints.

Procedure 8211 will be deleted under EC-10856 by PCR 01133437 and replaced with directions in B.05.01.02-05 by PCR 01133449.5.30 Procedure 8212, Rev 2, APRM Calibration Readjustment for Two Loop, discusses APRM setpoint voltage adjustments including Downscale Rod Block, Hi-Hi Scram, etc. Changes have been made by PRNM and this calculation evaluates the non-flow biased PRNM setpoints.

Procedure 8212 will be deleted under EC-10856 by PCR 01133445 and replaced with directions in B.05.01.02-05 by PCR 01133449.5.31 Procedure 0012, Rev 41 APRM/Flow Reference Scram Functional Check, performs the calibration of the APRM including the Neutron Flux High Scram, Setdown Scram, Setdown Rod Block, and Downscale Rod Block setpoints.

Setpoints are revised as a result of this calculation.

0012 will be deleted under EC-10856, PCR 01133332.

Procedures ISP-NIP-0588, ISP-NIP-0588-01, ISP-NIP-0589-02 will be developed to replace Procedure 0012 by PCRs 01129124, 01129125, and 01129126.5.32 MNGP Technical Specifications Bases, Rev 8, Bases will be revised to discuss the PRNM APRM Neutron Flux High setpoint, which is non-flow bias, in place of the existing Flow Referenced Neutron Flux-High High setpoint.

GAR 01146762 initiated to update Technical Specification Bases in accordance with EC 10856 and calculation CA-08-050.

5.33 Specification 24A5221, Specification for PRNM MUMAC Power Range Neutron Monitoring System.-----------

-.... .....

MONTICELLO NUCLEAR GENERATING PLANT CA-08-050 TITLE: Instrument Setpoint Calculation

-Revision 0 Average Power Range Monitor (APRM) Non-Flow Biased PRNM Setpoints for CLTP and EPU Page 9 of 58 5.34 B.05.01.02-02, Rev 6, Operations Manual Section -Power Range Neutron Monitoring, specifies NMS trip setpoints, which are being changed due to PRNMS.B.05.01.02-02 will be revised under EC-1 0856 by PCR 01137808.5.35 B.05.01.02-05, Rev 16, Operations Manual Section -Power Range Neutron Monitoring, System Operation.

B.05.01.02-05, Rev 16 refers to the six APRM channels, which applies to the existing NMS. PRNMS has four APRM channels as stated is Section 7.2:2.1 of this calculation.

PCR 01146778 issued to revise B.05.01.02-05, Rev 16, upon implementation of EC 10856.5.36 Design Input Request (DIR) T0500, Neutron Monitoring System, DRF 000-0040-9168. This DIR provides design information on the LPRMs used for input to the PRNM equipment.

5.37 Engineering Standards Manual ESM-03.02-APP-I, Appendix I (GE Methodology Instrumentation

& Controls), Revision 4.6. ASSUMPTIONS None.I .............

.... ........

MONTICELLO NUCLEAR GENERATING PLANT CA-08-050 TITLE: Instrument Setpoint Calculation

-Revision 0 Average Power Range Monitor (APRM) Non-Flow Biased PRNM Setpoints for CLTP and EPU Page 10 of 58 7. ANALYSIS 7.1 APRM Non-Flow Biased PRNM Licensing Setpoints 7.1.1 Channel Diagram for APRM Neutron Flux Setpoints LPRM Detector NUMAC PRNMS Output Channels:'(Device 1) Power Electronics APRM Neutron Flux -High Scram 14 minimum of 24 (Device 2) APRM Neutron Flux -High (Setdown)

Scram APRM Neutron Flux -(Setdown)

Rod Block APRM Downscale Rod Block 7.1.2 Channel Function: The APRM system calculates an average of the incore Local Power Range Monitor (LPRM) chamber signals. The LPRMs are averaged such that the APRM signal is proportional to the core average neutron flux and can be calibrated as a means of measuring core thermal power. The number of APRM channels is reduced to four from six and the LPRM's are re-assigned to increase the number of LPRM's in the APRM average. The logic of the trip output signals from the APRM channels is modified from the original design to implement a Two-out-of-Four (2/4) trip logic that eliminates half Scrams resulting from a single PRNM channel failure. A neutron flux trip in any two APRM channels will cause a Scram.The APRM Neutron Flux High Scram is capable of generating a trip signal to prevent fuel damage or excessive RCS pressure in high power range. For rapid neutron flux increase events, the thermal power lags the neutron flux and APRM Neutron Flux High Scram will provide a Scram signal before the APRM Flow Biased Simulated Thermal Power (STP) Scram. The APRM Neutron Flux High Scram is based on unfiltered neutron flux signal.The APRM Setdown Scram is capable of generating a trip signal that prevents fuel damage resulting from abnormal operating transients in the low power range. The APRM Setdown Rod Block is a precursor to the APRM Setdown Scram. The setdown Scram is a redundant Scram, which overlaps the IRM region, for reactivity transients in the startup mode. This provides-defense-in'-

depth for reactivity transients in the startup mode.The APRM Downscale Rod Block initiation ensures that there is sufficient overlap of the operating regions of the APRMs and IRMs with the IRM detectors fully inserted.

APRM Downscale Rod Block function provides indication of instrument failure or insensitivity.

MONTICELLO NUCLEAR GENERATING PLANT CA-08-050 TITLE: Instrument Setpoint Calculation

-Revision 0 Average Power Range Monitor (APRM) Non-Flow Biased PRNM Setpoints for CLTP and EPU Page 11 of 58 7.2 Instrument Definition and Device Uncertainty Terms The APRM Non-Flow Biased Loop is composed of LPRM Detectors (Device 1)and NUMAC PRNMS Power Electronics (Device 2).7.2.1 Device 1: LPRM Detector Data 7.2.1.1 Instrument Definition:

Device 1 -LPRM Detectors Component IDs: Total: 24 LPRM Detector strings containing 4 detectors each = 96 LPRM Detectors INDREC LPRM-04-29 INDREC LPRM-12-13 INDREC LPRM-12-21 INDREC LPRM-12-29 INDREC LPRM-12-37 INDREC LPRM-20-13 INDREC LPRM-20-21 INDREC LPRM-20-29 INDREC LPRM-20-37 INDREC LPRM-20-45 INDREC LPRM-28-05 INDREC LPRM-28-13 INDREC LPRM-28-21 INDREC LPRM-28-29 INDREC LPRM-28-37 INDREC LPRM-28-45 INDREC LPRM-36-13 INDREC LPRM-36-21 INDREC LPRM-36-29 INDREC LPRM-36-37 INDREC LPRM-36-45 INDREC LPRM-44-21 INDREC LPRM-44-29 INDREC LPRM-44-37 Sigma Reference(s)

Location Drywell n/a Input 4.9, Item 2 Make GE/Reuter Stokes n/a Input 4.9, Item 22 Model GE NA300 n/a Input 4.9, Item 22 Local Power Range Monitor Input 4.2, Section 1-CLTP Process Element (LPRM) Neutron detector n/a Input 4.3, Section 1-EPU Upper Range Limit (UR) n/a n/a n/a__Calibrated Span (SP) n/a n/a n/a Design maximum neutron flux of Input (neutron flux) 2.3E14 nv n/a Input 4.9, Item 23 Output (LPRM electronics) 0.0 to 3 ma n/a Input 4.5, Section 5.3.17.6 Minimum # of LPRMs per Input 4.2,Section 2.3-CLTP APRM 14 of 24 n/a Input 4.3,Section 2.3-EPU------ -----

MONTICELLO NUCLEAR GENERATING PLANT CA-08-050 TITLE: Instrument Setpoint Calculation

-Revision 0 Average Power Range Monitor (APRM) Non-Flow Biased PRNM Setpoints for CLTP and EPU Page 12 of 58 7.2.1.2 Process and Physical Interfaces:

Device I -LPRM Detectors Process and Physical Interfaces Sigma Reference(s)

Calibration Temperature n/a for LPRM detector due to in-core Range location n/a n/a Calibration/Surveillance Interval 7 Days n/a Technical Specifications Normal Plant Conditions:

LPRM detectors are exposed to reactor operating conditions: " Temperature

• Design Temperature 546 deg F" Radiation

• Gamma 2.4 R/hr; Neutrons 10 R/hr" Pressure e Design Pressure 1250 psig" Humidity at Assembly a Condensation Dripping water is Connector present n/a Input 4.10 Trip Environment Conditions Not applicable for setpoint calculation n/a n/a Long Term Post Accident Conditions Not applicable for setpoint calculation n/a n/a Seismic Conditions Not applicable for setpoint calculation n/a n/a Process Conditions:

During Calibration Worst Case During Function Not applicable for setpoint calculation n/a n/a MONTICELLO NUCLEAR GENERATING PLANT CA-08-050 TITLE: Instrument Setpoint Calculation

-Revision 0 Average Power Range Monitor (APRM) Non-Flow Biased PRNM Setpoints for CLTP and EPU Page 13 of 58 7.2.1.3 Individual Device Accuracy LPRM Detectors Value Symbol Term (% RTP) Sigma Reference 0 %, LPRM detector Instrument Accuracy accuracy is included in Input 4.2, Section 2.3-CLTP A 1 LPRM Detector 'APEA n/a Input 4.3, Section 2.3-EPU 00 %, LPRM detector drift in Input 4.2, Section 2.3-CLTP D, LPRM Drift included in DPEA n/a Input 4.3, Section 2.3-EPU= +/- APEAR + APEAb APEA- Accuracy per +/- 1.00 % RTP + bias 0.49 Input 4.2, Section I-CLTP APEA LPRM detector % RTP 2 Input 4.3, Section 1-EPU= +/- DPEAR + DPEAb DPEA -Drift per +/- 0.2 % RTP/ 7days + bias Input 4.2, Section 1 -CLTP DPEA LPRM detector 0.33 % RTP 2 Input 4.3, Section 1-EPU 0 %, Design temperature is normal in-core temperature of 546 deg F. LPRM electronics temperature Input 4.9, Item 2 Accuracy effect is included in Input 4.2, Section 2.3-CLTP ATE Temperature Effect accuracy n/a Input 4.3, Section 2.3-EPU n/a -Overpressure effect is not applicable for LPRM Detector accuracy.Detector is designed for OPE Overpressure Effect 1250 psig. n/a Input 4.9, Item 2 n/a -Static pressure effect is not applicable for LPRM Detector accuracy due to SPE Static Pressure Effect in-core location.

n/a n/a n/a -Seismic effect is not applicable because APRM Scram and rod block are only required during normal SE Seismic Effect operating conditions' n/a n/a n/a -Radiation effect is not applicable because LPRM detector is designed for a lifetime nv of 1.2E14 nv @RE Radiation Effect 1E9 Rem/hr. n/a Input 4.9, Item 2 n/a -Humidity is not applicable because LPRM HE Humidity detector is located in-core. n/a n/a Input 4.2, Section 1-CLTP Input 4.3, Section 1-EPU Negligible for LPRM Comment 16 in each of the PSE Power Supply Effect detector n/a above Inputs.n/a -RFI/EMI effect is not applicable because LPRM REE RFI/EMI Effect detector is located in-core. n/a n/a MONTICELLO NUCLEAR GENERATING PLANT CA-08-050 TITLE: Instrument Setpoint Calculation

-Revision 0 Average Power Range Monitor (APRM) Non-Flow Biased PRNM Setpoints for CLTP and EPU Page 14 of 58 7.2.2 Device 2: NUMAC PRNMS Power Electronic Data (LRPM, APRM, Trip Circuits)7.2.2.1 Instrument Definition Device 2 -NUMAC PRNMS Power Electronic Data Component ID's: INDREC APRM I INDREC APRM 2 INDREC APRM 3 INDREC APRM 4.Device 2 -NUMAC PRNMS Power Electronic Data Sigma Reference(s)

Power Electronics:

Admin Building, El Input 4.2, Section 2.3-CLTP Location 951' n/a Input 4.3, Section 2.3-EPU Input 4.2, Section 2.3-CLTP Make GE n/a Input 4.3, Section 2.3 -EPU Input 4.2, Section 2.3-CLTP Model NUMAC n/a Input 4.3, Section 2.3-EPU Input 4.2, Section 2.3-CLTP Calibration Scale Full Scale = 125 % RTP n/a Input 4.3, Section 2.3-EPU Input 4.2, Section 2.3-CLTP Upper Range Limit n/a n/a Input 4.3, Section 2.3-EPU Input signal 0 -3 ma from each LPRM n/a Input 4.5, Section 5.3.17.6 Analog Output signal: Outputs to: Flux Recorders, Flow Recorders, Flow Indicatiors, Computer -10 to + 10 VDC (maximum) n/a Input 4.5, Section 5.3.17.7 Points MONTICELLO NUCLEAR GENERATING PLANT CA-08-050 TITLE: Instrument Setpoint Calculation

-Revision 0 Average Power Range Monitor (APRM) Non-Flow Biased PRNM Setpoints for CLTP and EPU Page 15 of 58 7.2.2.2 Process and Physical Interfaces Device 2 -NUMAC PRNMS Power Electronic Data Sigma Reference(s)

Calibration Temperature Input 4.2, Section 2.3-CLTP Range 72 to 78 deg F n/a Input 4.3, Section 2.3-EPU CalibrationlSurveillance Input 4.2, Section 2.3-CLTP Interval 700 hours0.0081 days <br />0.194 hours <br />0.00116 weeks <br />2.6635e-4 months <br /> 2 Input 4.3, Section 2.3-EPU Normal Plant Conditions:

Temperature 72 to 78 deg F n/a Radiation Negligible 2 Pressure n/a 2 Input 4.2, Section 2.3-CLTP Humidity Included in Accuracy 2 Input 4.3, Section 2.3-EPU Trip Environment 72 to 78 deg F Input 4.2, Section 2.3-CLTP Conditions Same as Normal Plant Conditions n/a Input 4.3, Section 2.3-EPU n/a -Scram and Rod Block functions Long Term Post Accident are only required during normal Conditions conditions.

n/a n/a Input 4.2, Section 2.3-CLTP, Comment 4 Input 4.3, Section 2.3-EPU, Seismic Conditions Included in Accuracy 2 Comment 4 Process Conditions:

During Calibration Worst Case During Function n/a for APRM calibration n/a n/a (*

MONTICELLO NUCLEAR GENERATING PLANT CA-08-050 TITLE: Instrument Setpoint Calculation

-Revision 0 Average Power Range Monitor (APRM) Non-Flow Biased PRNM Setpoints for CLTP and EPU Page 16 of 58 7.2.2.3 Individual Device Accuracy Device 2 -NUMAC PRNMS Power Electronic Data Value Symbol Term (% RTP) Sigma Reference Instrument Accuracy of LPRM flux channel Input 4.2, Section 2.3-CLTP A 2 electronics

+/- 0.943 % RTP 2 Input 4.3, Section 2.3-EPU Power Electronics Input 4.2, Section 2.3-CLTP D2 Drift +/- 0.50 RTP FS/700 Hours 2 Input 4.3, Section 2.3-EPU APMA a. tracking Process Measure a. +/- 1.11 % RTP Input 4.2, Section 1-CLTP b. noise Accuracy b. +/- 2.00 % RTP 2 Input 4.3 Section 1=EPU input 4.2, Section 2.3-CLTP ALT specified by the and Comment 11 Loop Calibration AGAF process Input 4.3, Section 2.3-EPU CL Accuracy Error +/- 2.0 % RTP 3- and Comment 11+/- 2.0% RTP based on APRM Gain Adjustment Input 4.2, Section 2.3-CLTP ALTL As-Left Tolerance Factor (AGAF) 3 Input 4.3, Section 2.3-EPU= ALT, Input 4.2, Section 2.3-CLTP AFTL As-Found Tolerance

= +/- 2.0 % RTP 3 Input 4.3, Section 2.3-EPU* Accuracy Input 4.2,-Section 2.3-CLTP ATE Temperature Effect Included in Accuracy .2 Input 4.3, Section 2.3-EPU' Input 4.2, Section 2.3-CLTP and Comment 5;n/a for APRM Power Input 4.3, Section 2.3-EPU OPE Overpressure Effect electronic n/a and Comment,5 Input 4.2, Section 2.3-CLTP and Comment 5;n/a for APRM Power Input 4.3, Section 2.3-EPUI SPE Static Pressure Effect electronic n/a and Comment 5 Input 4.2, Section 2.3-CLTP and Comment 4;Input 4.3, Section 2.3-EPU SE Seismic Effect Included in Accuracy 2 and Comment 4 Input 4.2, Section 2.3-CLTP and Comment 4;Input 4.3, Section 2.3-EPU RE Radiation Effect Negligible 2 and Comment 4 Input 4.2, Section 2.3-CLTP and Comment 4;Input 4.3, Section 2.3-EPU HE Humidity Included in Accuracy 2 and Comment 4 Input 4.2, Sections 1 and 2.3-, CLTP, Comment 4&16;Power Supply Effect Input 4.3, Sections 1 and 2.3, PSE (LPRM Detector)

Negligible 2 Comment 4&16-EPU Input4.2, Section 2.3-CLTP and Comment 4;Input 4.3, Section 2.3-EPU and REE RFI/EMI Effect Negligible 2 Comment 4 MONTICELLO NUCLEAR GENERATING PLANT CA-08-050 TITLE: Instrument Setpoint Calculation

-Revision 0 Average Power Range Monitor (APRM) Non-Flow Biased PRNM Setpoints for CLTP and EPU Page 17 of 58 7.3 Loop Instrument Uncertainty Evaluation 7.3.1. CLTP Operation Loop Instrument Uncertainty:, The loop uncertainty associated with the replacement of analog neutron monitoring system with the digital NUMAC PRNMS for CLTP operation is discussed and calculated in this section.7.3.1.1 Loop Instrument Accuracy (AL)Loop Instrument Accuracy (AL) is defined as the accuracy of the LPRM flux channel electronics.

The GEH Input documents, Input 4.2 and 4.3, for the digital PRNMS specify a LPRM flux channel electronic accuracy for PRNM chassis. The accuracy of the LPRM detector is specified as APRM PEA or APEA (Accuracy) as defined in Section 7.2.1.3. Since the accuracy of the LPRM detector is included in APEA (Accuracy), it will be used in the calculation of Loop Primary Element Accuracy (APEAL). Calculation of Loop Accuracy (AL) will use the LPRM Electronics accuracy value.Loop Instrument Accuracy depends on number of LPRMs averaged by the PRNM APRM. As indicated below, the statistical average is based on Input 4.12, which is shown in Attachment

4. The fewer LPRMs averaged, the greater the accuracy error. Averaging the minimum number of LPRM detectors (14) versus a larger number (24) equals the following accuracy errors: Averaging Calculation Example: The following shows how number of LPRM detectors affects the accuracy error. For example, the APEA for each LPRM is +/-1.0%RTP +/- bias oft0.49 %RTP as indicated in Section 7.1.2.3.Input 4.12 (Attachment

4) can be interrupted as the following:

Accuracy Error Accuracy(perLPRM) n = number of LPRM detectors used 14 LPRM Detectors:

Accuracy Error = ++/-1.0%RTP

_7- =+/-0.267 %RPT 1 .0%RTP_,24 LPRM Detectors:

Accuracy Error = + =+ 0.204 % RPT r24 For conservatism; the minimum number of LPRM detectors (14) is used in the accuracy calculations.

MONTICELLO NUCLEAR GENERATING PLANT CA-08-050 TITLE: Instrument Setpoint Calculation

-Revision 0 Average Power Range Monitor (APRM) Non-Flow Biased PRNM Setpoints for CLTP and EPU Page 18 of 58 Individual Device Accuracy Device 1: LPRM Detector (A,)As stated above, the LPRM Detector accuracy is included in APRM PEA.(APEA) term. Section 7.3.1.6 calculates Loop Primary Element Accuracy (APEAL) using this term. Therefore, LPRM flux channel electronics accuracy for Device 1 will be considered 0 % RPT.A 1 = LPRM flux channel electronics accuracy for LPRM Detector A 1 = 0 % RPT since it is included in APEA term. Section 7.2.1.3 Device 2: Power Electronics (NUMAC PRNMS) (A 2)As stated above, the PRNM chassis electronics for the flux-generated analog signal is the term below for one LPRM detector.Accuracy (LPRM Electronics)

= 0.943 % RTP. (Section 7.2.2.3)GEH does not breakdown the components of the LPRM flux channel electronics accuracy in their submitted PRNM documents.

The calculation of the LPRM electronics accuracy is considered proprietary.

The LPRM module, which receives analog input from the LPRM detector, is'part of the new PRNM chassis. Another component is the digital processing of the LPRM detector signal: The LPRM electronics accuracy specified applies to one LPRM detector.The APRM averages the LPRM signals to obtain reactor power indication.

The minimum number of LPRMs is 14 in accordance Section 7.2.1.1.Per Input 4.12, the accuracy will be 1/14 of the square root of the sum of the squares of the 14 LPRMs as expressed by: A 2 = Overall (mean) accuracy for the LPRM flux channel Electronics A 2= +/- I ,AO.9434 x14 14 A 2 = +/- 0.253 % RTP Loop Instrument Accuracy (A,)A 1 = +/- 0.00 % RTP A 2= +/- 0.253 % RTP MONTICELLO NUCLEAR GENERATING PLANT CA-08-050 TITLE: Instrument Setpoint Calculation

-Revision 0 Average Power Range Monitor (APRM) Non-Flow Biased PRNM Setpoints for CLTP and EPU Page 19 of 58 AL= (A) F+(A 2)2 AL= +/- (0.000)2 +(0.0253)2 AL= +/- 0.253 % RTP 7.3.1.2 Loop Instrument Drift (DL)Loop Instrument Drift (DJ) is defined as the Square Root of the Sum of the Squares (SRSS) of the individual Device drifts.For this calculation, Section 7.2.1.3 states the drift of the LPRM detectors (Device 1) is included in DPEA. Discussions with GE Instrument Engineers confirmed that the total drift error for GE LPRM detectors is known and is accurate for the LPRM detector Random drift error and the Bias drift error components.

For Device 2, Section 7.2.2.3 states the NUMAC PRNM Power Electronics drift is 0.5 % RTP Full Span when calibration every 700 hours0.0081 days <br />0.194 hours <br />0.00116 weeks <br />2.6635e-4 months <br />. The source of this drift value is Input 4.2.Methodology, Section 2, states that this calculation uses GE specified drift parameters for the applicable PRNM equipment and for the existing LPRM detectors.

Standards Manual ESM-03.02-APP-I, Section 5.2.4, shows a alternate methodology for determination of individual device drift. For this application, it is considered more accurate to use GE specified device drift values since both PRNM equipment and LPRM detectors are provided by the manufacturer.

Individual Device Drift Device 1 Drift of Device 1 D 1 = + 0.00 % RTP (FS) / 700 days because the LPRM (Device 1) drift is included in DPEAas specified in Section 7.2.1.3.Device 2 Drift of Device 2 = D 2 = + 0.50 % RTP FS / 700 Hours (Section 7.2.2.3)Since the APRMs will be calibrated against the reactor heat balance every 7 days, 700 hours0.0081 days <br />0.194 hours <br />0.00116 weeks <br />2.6635e-4 months <br /> drift value is conservative.

Converting percent full span (FS) to the percent power yields: D2 = +/- 0.50 x (125 % RTP/ 100 % RTP FS)

MONTICELLO NUCLEAR GENERATING PLANT CA-08-050 TITLE: Instrument Setpoint Calculation

-Revision 0 Average Power Range Monitor (APRM) Non-Flow Biased PRNM Setpoints for CLTP and EPU Page 20 of 58 D2 0.625 % RTP Loop Instrument Drift (DL, D, = +/- 0.000 % RTP D2 = +/- 0.625 % RTP Loop Instrument Drift DL = +/- (D)2 + (D2 DL =+/-(0.000)2

+ (0.625)2 : 0.625 % RTP 7.3.1.3 Loop As-Left Tolerance (ALTL)The loop As-Left tolerance (ALTL) is being evaluated from two perspectives.

The first is based on GEH Input 4.2, Section 2.3 and Comment 11. Input 4.2 states that the As-Left Tolerance is equal to the Auto Gain Adjustment Factor (AGAF), which is +/- 2.00 % RTP at 3u. Input 4.2, Comment 11, states the basis for AGAF equaling +/- 2.00 % RTP is as follows: The APRM subsystem is calibrated every 7 days using the AGAF process, where the gain of the APRMs is adjusted to read the Rated Thermal Power (RTP), also called Core Thermal Power, determined by the Process Computer (P/C), within a specified As-Left Tolerance.

This is equivalent to a standard calibration of the APRM electronics sub-loop (consisting of the LPRM and APRM signal conditioning electronics),*

where the P/C is the calibration tool and standard.

The P/C and heat balance error is already accounted for in the transient analyses.

Thus, the only calibration error to consider for the APRM electronics sub-loop is the As-Left Tolerance specified by the AGAF process.A. Loop As-Left Tolerance (ALTL) used in uncertainty calculations is determined by the AGAF process: As described above, the basis for this ALTL calculation is GEH Input 4.2, Section 2.3.ALTL = AGAF which is equal to: +/- 2.00 % RTP at 3u. (Section 7.2.2.3)The tolerance is normalized to a 2 -confidence level in accordance with ESM-03.02-APP-I, Section 4.3 (Input 4. 1), Converting to 2 a: ALTL = +/- 2.00 x (2/3) % RTP at 2or.ALTL = +/- 1.334 % RTP for use in uncertainty calculations The second analysis of ALTL is based on PRNM surveillance calibration of PRNM.electronics.

The LPRMv detector loop is not involved.

The electronics MONTICELLO NUCLEAR GENERATING PLANT CA-08-050 TITLE: Instrument Setpoint Calculation

-Revision 0 Average Power Range Monitor (APRM) Non-Flow Biased PRNM Setpoints for CLTP and EPU Page 21 of 58 being calibration checked is PRNM digital equipment.

The setpoints being checked are numerical values stored in the digital hardware and are not subject to drift.B. ALTL used for PRNM surveillance calibration procedures:

ALTL = 0.00 % RTP based on PRNM digital hardware without LPRM detectors 7.3.1.4 Loop As-Found Tolerance (AFTL)The As-Found Tolerance (AFTL) is being evaluated from two perspectives similar to ALTL, Section 7.3.1.3. The results are indicated below: A. Loop As-Found Tolerance (AFTL), used in loop uncertainty calculations, is determined by GEH Input 4.2, Section 2.3, which states: AFTL = ALTL (Section 7.2.2.3)ALTL= + 2.00 % RTP at 3o-as defined in Section 7.3.1.3.The tolerance is normalized to a 2 -confidence level In accordance with ESM-03.02-APP-1, Section 4.3 (Input 4.1).AFTL = + 2.00 % x (2/3) % RTP at 2 -AFTL = +/- 1.334 % RTP for use in uncertainty calculations The tolerance is normalized to a 2 a confidence level in accordance with ESM-03.02-APP-I, Section 4.3 (Input 4.1), Converting to 2 o-AFTL = +/- 2.00 x (2/3) % RTP at 2o-.AFTL = +/- 1.334 % RTP used for uncertainty calculations The second analysis of AFTL is based on PRNM surveillance calibration of only PRNM electronics.

The LPRM detector loop is not involved.

The setpoints being checked are numerical values stored in the digital hardware and are not subject to drift.B. AFTL used for PRNM surveillance calibration procedures:

AFTL= 0.00 % RTP based on PRNM digital hardware without LPRM detectors MONTICELLO NUCLEAR GENERATING PLANT CA-08-050 TITLE: Instrument Setpoint Calculation

-Revision 0 Average Power Range Monitor (APRM) Non-Flow Biased PRNM Setpoints for CLTP and EPU Page 22 of 58.7.3.1.5 Loop Calibration Accuracy Error (CL)In accordance with GEH specification in Input 4.2, Comment 11, the only calibration error to consider for the APRM electronics sub-loop isthe loop As-Left Tolerance (ALTL) specified by the AGAF process. Calibration Accuracy Error (CL) is the As-Left Tolerance (AFTL) defined for uncertainty calculations.

Loop Calibration Accuracy Error = CL CL- =ALTL= +/- 1.334 % RTP (Section 7.3.1.3)7.3.1.6 Loop Primary Element Accuracy (APEA,)APEA is equal to the Random Accuracy per LPRM detector plus the Bias Accuracy Error per LPRM detector.

Section 7.2.1.3 indicates that the Power Supply Effect of the LPRM Detector in included in the APEA. This is in accordance with Inputs 4.2 and 4.3.APEA = Random Accuracy Error/LPRM detector + Bias Accuracy/LPRM Detector Random Accuracy Error = +/- APEAR = +/- 1.00 % RTP/ LPRM Bias Accuracy Error = APEAb = 0.49 % RTP bias APEA -1.00 % RTP/ LPRM + 0.49% RTP bias/ LPRM (Section 7.2.1.3)(Section 7.2.1.3)Loop Primary Element Accuracy (APEAL) = overall (mean) accuracy APEAL is equal to the Random Accuracy per LPRM detector divided by the square root of the minimum number of LPRM detectors plus the Bias Accuracy Error per LPRM detector.APEA + 1.0%RTP APEAL -+/- + 0.49%RTPbias For conservatism, Bias terms are positive.APEAL = + 0.268 % RTP + 0.49 % RTP bias.(Input 4.12)

MONTICELLO NUCLEAR GENERATING PLANT CA-08-050 TITLE: Instrument Setpoint Calculation

-Revision 0 Average Power Range Monitor (APRM) Non-Flow Biased PRNM Setpoints for CLTP and EPU Page 23 of 58 7.3.1.7 Loop Drift Primary Element Accuracy (DPEAL)DPEA is equal to the Random Drift Error per LPRM detector plus the Bias Drift Error per LPRM detector. (Section 7.2.1.3)* Therefore, DPEA is defined as: DPEA = Random Drift Error/LPRM detector + Bias Drift Error/LPRM Detector Random Drift Error = DPEAR = + 0.20 % RTP/ LPRM (Section 7.2.1.3)Bias Drift Error = DPEAb = 0.33 % RTP bias DPEA = +/- 0.20 % RTP/ LPRM + 0.33 % RTP bias/ LPRM (Section 7.2.1)Loop Drift Primary Element Accuracy (DPEAL) = overall (mean) accuracy DPEAL is equal to the Random Drift Error per LPRM detector divided by the square root of the minimum number of LPRM detectors plus the Bias Drift Error per LPRM detector.+/- 0.20%RTP + ,.33%RTPbias (Input 4.12)DPEAL = 14 -For conservatism, the Bias terms are positive.APEAL = + 0.054 % RTP + 0.33 % RTP bias 7.3.1.8 Loop APRM Process Measurement Accuracy (APMAL)APMAtracking

-1.11 % RTP (Section 7.2.2.3)APMAnise = + 2.00 % RTP (Section 7.2.2.3)APMAL = +/-

)2 + (APMAnos,,e)

APMAL= +/- (11%)2 +(2.00%)2 APMAL=+ 2.288 %-RTP MONTICELLO NUCLEAR GENERATING PLANT CA-08-050 TITLE: Instrument Setpoint Calculation

-Revision 0 Average. Power Range Monitor (APRM) Non-Flow Biased PRNM Setpoints for CLTP and EPU Page 24 of 58 7.3.1.9 Tabulation of Loop Uncertainties

-PRNM CLTP Operation Uncertainty Random Bias Type Term _ % RTP -% RTP Section AL Loop Instrument Accuracy 0.253 7.3.1.1 DL Loop Instrument Drift .625 7.3.1.2 ALTL Loop As-Left Tolerance (uncertainty) for uncertainty calculations 1.334 7.3.1.3 ALTL Loop As-Left Tolerance for (calibration) electronic calibrations 0.00 7.3.1.3 AFTL Loop As-Found Tolerance (uncertainty) for uncertainty calculations 1.334 7.4.1.4 AFTL Loop As-Found Tolerance (calibration) for electronic calibrations 0.00 7.3.1.4 Loop Calibration CL Accuracy Error 1.334 7.3.1.5 Loop APRM Primary APEAL Element Accuracy 0.268 7.3.1.6 Loop Drift Primary Element DPEAL Accuracy 0.054 7.3.1.7 Loop APRM Process APMAL Measurement Accuracy 2.288 7.3.1.8 APRM Primary Element APEAb Accuracy Bias 0.49 7.3.1,6 Drift Primary Element DPEAb Accuracy Bias 0.33 7.3.1.7 MONTICELLO NUCLEAR GENERATING PLANT CA-08-050 TITLE: Instrument Setpoint Calculation

-Revision 0 Average Power Range Monitor (APRM) Non-Flow Biased PRNM Setpoints for CLTP and EPU Page 25 of 58 7.3.2 EPU Operation Loop Uncertainty The comparison of Inputs 4.2 and 4.3 shows the individual device uncertainties associated with the EPU operation are identical to the individual device uncertainties associated with the CPTP operation.

The uncertainty terms tabulated in Sections 7.2.1 and 7.2.2 list both CLTP (Input 4.2) and EPU (Input 4.3) references.

Operating at EPU condition will not change the methodology used to combine the individual device uncertainties to produce the loop uncertainties.

Therefore, the loop uncertainties calculated for the PRNM CLTP operation (Section 7.3.1) will be applicable to the PRNM EPU Operation (Section 7.3.2). The EPU uncertainties are tabulated in the table below: 7.3.2.1 Tabulation of Loop Uncertainties

-PRNM EPU Operation Tabulation of Loop Uncertainties

-PRNM EPU Operation Uncertainty

' Random IBias Type Term t % RTP + % RTP Section AL Loop Instrument Accuracy 0.253 7.3.1.1 DL Loop Instrument Drift 0.625 7.3.1.2 ALTL Loop As-Left Tolerance (uncertainty) for uncertainty calculations 1.334 7.3.1.3 ALTL Loop As-Left Tolerance for (calibration) electronic calibrations 0.00 7.3.1.3 AFTL Loop As-Found Tolerance*(uncertainty) for uncertainty calculations 1.334 7.3.1.4 AFTL Loop As-Found Tolerance (calibration) for electronic calibrations 0.00 7.3.1.4 Loop Calibration Accuracy CL Error 1.334 7.3.1.5 Loop APRM Primary APEAL Element Accuracy 0.268 7.3.1.6 Loop Drift Primary Element DPEAL Accuracy 0.054 7.3.1.7 Loop APRM Process APMAL Measurement Accuracy 2.288 7.3.1.8 APRM Primary Element APEAb Accuracy Bias 0.49 7.3.1.6 Drift Primary Element DPEAb Accuracy Bias 0.33 7.3.1.7 MONTICELLO NUCLEAR GENERATING PLANT CA-08-050 TITLE: Instrument Setpoint Calculation

-Revision 0 Average Power Range Monitor (APRM) Non-Flow Biased PRNM Setpoints for CLTP and EPU Page 26 of 58 7.4 PRNM CLTP Operation Setpoint Evaluation 7.4.1 PRNM CLTP APRM Neutron Flux -Hiah Scram Input 4.2, Section 3, states the following Analytical Limit (AL), the recommended Allowable Value (AV) and the Nominal Trip Setpoint (NTSP) for CLTP operation with NUMAC -PRNM equipment installed.

PRNM CLTP Setpoint (% RTP) AL AV NTSP APRM Neutron Flux -High Scram 125.0 122.0 119.5 The following calculations will determine the minimum required margin between the specified AL of 125.0 % RTP, AV of 122.0 % RTP and NTSP of 119.5%RTP.7.4.1.1 Allowable Value (AV) Evaluation Input 4.11, Section 1.2.3.2, provides the following formulas for calculating the AV from the AL: AV _ AL----_(14(AL)6

+ (CL)2 + (PMA)2 +(PEA)2 +/-_bias Minimum required margin between AL and AV can be defined by: 2 Reqire +(CLM i + (APLAV) = + (APEAL [ APEAb Minimum Required Margin (AL-AV) RM AL -AV RM= AL -AV 1.45)(0.253)2

+ (1.*334)2

+ (2.288)2 + (0.268)' + (0.4190)RM = AL -AV = 2.69 % RTP MONTICELLO NUCLEAR GENERATING PLANT CA-08-050 TITLE: Instrument Setpoint Calculation

-Revision 0 Average Power Range Monitor (APRM) Non-Flow Biased PRNM Setpoints for CLTP and EPU Page 27 of 58 Available Margin (AL -AV) =AM = AL -AV AM = AL -AV = (125.0 -122.0) % RTP AM = AL- AV = 3.00 % RTP Available Minimum PRNM CLTP Setpoint AL AV Margin Required AV (% RTP) (AL -AV) Margin Acceptable APRM Neutron Flux- 125.0 122.0 3.0 2.69 Yes High Scram Since the available margin is greater than the minimum required margin (3.0 % RTP versus 2.69 % RTP), the recommended AV is acceptable.

7.4.1.2 Nominal Trio Setpoint (NTSP) Evaluation Input 4.11, Section 1.2.3.3 provides the following formula for calculating the NTSP from the AL: I1"645)V(-A)T NTSP<AL- ---L-- L2 +(CL)2 +(DL)2 +(PA)2 + (PEA)2 +_bias Minimum required margin between AL and NTSP can be defined by: (1.645"1,A\

b--()VAL) + (CL)2 + (DL)2 + (APMAL)2 + (APEAL)2 + (DPEAL)2 + APEA,. + DPEAb Minimum Required Margin (AL- NTSP) = RM = AL -NTSP RM = AL -NTSP=(1. 645 )(0.2 53)2 +(1.334)2

+/-(0.625) 2 ~+(2.288)2

+(0 .268)2 +(0.054)2

+0.49+0.33 2,f RM = AL -NTSP =,3.08 % RTP MONTICELLO NUCLEAR GENERATING PLANT CA-08-050 TITLE: Instrument Setpoint Calculation

-Revision 0 Average Power Range Monitor (APRM) Non-Flow Biased PRNM Setpoints for CLTP and EPU Page 28 of 58 Available Marain (AL -NTSP) = AM = AL.- NTSP AM =AL- NTSP = (125.0- 119.5) % RTP = 5.50 % RTP Available 1 Minimum PRNM CLTP AL NTSP Margin Required NTSP Setpoint (% RTP) (AL-NTSP)

Margin Acceptable APRM Neutron Flux- 125.0 119.5 5.5 3.08 Yes High Scram Since the available margin is greater than the minimum required margin (5.5 %RTP versus 3.08 % RTP), the recommended NTSP is acceptable.

7.4.1.3 Licensee Event Report (LER) Avoidance Test The purpose of the LER Avoidance Test is to assure that there is sufficient margin between the AV and NTSP to reasonably avoid violations of the AV.Input 4.11, Section 1.2.3.5, provides the following formula for determining LER avoidance criteria.ULER (AL) (CJ) +(DL)2 Where n is the number of standard deviations used (2 o-)0-LER = V(0.253)2 + (1.334)2 + (0.625)2 CLER = 0.75 % RTP For multiple instrument channels, a Z value of greater than 0.81 provides sufficient margin between NTSP and AV as specified in ESM-03.02-APP-I, Section 5.6.3 (Input 4.1).In accordance with Input 4.1, Section 5.6.3, Z is defined as: z = AV-NTSPý _ 1(122.0-119.5)%RTPI

= 3.33 CLER (0.75)%RTP Since Z is greater than 0.81, sufficient margin exists between the specified AV and NTSP.

MONTICELLO NUCLEAR GENERATING PLANT CA-08-050 TITLE: Instrument Setpoint Calculation

-Revision 0 Average Power Range Monitor (APRM) Non-Flow Biased PRNM Setpoints for CLTP and EPU Page 29 of 58 Minimum margin NTSP 2 will be calculated using the minimum Z value of 0.81.Minimum margin NTSP 2 will be compared with the current NTSP of 119.5 %RTP. This will indicate the amount of conservatism for the NTSP.NTSP 2 Offset is defined as the minimum margin (% RTP) between AV and NTSP 2 with Z of 0.81 used.NTSP 2 Offset = Z x-LER NTSP 2 Offset = (0.81 x 0.75) % RTP = 0.61 % RTP NTSP 2 is calculated to provide an NTSP based on the minimum LER avoidance criteria: NTSP 2 < AV -NTSP 2 Offset NTSP 2 < 122.0 % RTP -0.61 % RTP NTSP 2 _< 121.4 % RTP For the minimum valve of Z equal to 0.81, NTSP 2 , which is defined as the LER Avoidance NTSP, is to be less than 121.4 % RTP.A conservative NTSP of 119.5 % RTP is used. Attachment 1, Setpoint Diagrams, shows margin for the APRM Neutron Flux -High Scram setpoint.7.4.1.4 Spurious Trip Avoidance (STA) Test A Spurious Trip Avoidance test is performed to assure that there is a reasonable probability that spurious trips will not occur using the selected setpoint.Input 4.11, Section 1.2.3.4, provides the following formula for determining Spurious Trip avoidance.

Input 4.13, Sections 4.5.4.b and 4.5.9.b, state that any bias associated with PMA or PEA should also be included.

Therefore, APEAb shown in CLTP Loop Uncertainty table in Section 7.3.1.9 is being included.= =(i)1AL2 +(C)2 +(DL)2 + (PMA)2 + (PEA)2-+APEAb Where n is the number of standard deviations used (2 a)DPEAL and DPEAb were defined and evaluated in Section 7.3.1.7. These terms areto be included in the above aSTA equation as follows:

MONTICELLO NUCLEAR GENERATING PLANT CA-08-050 TITLE: Instrument Setpoint Calculation

-Revision 0 Average Power Range Monitor (APRM) Non-Flow Biased PRNM Setpoints for CLTP and EPU Page 30 of 58 o~ <~L>I(A,)2

+(CL)2 I(L) +(pAMA)2 + (pEA) I + (DpEAL)2 AEb+P Using APRM terms, o-STA is defined as: U-STA +VG(A) L +(D, + (A +(APEA +(DPEAL +/-APEAb+ DPEAb USTA =- V(0.253) +(1.334)2

+(0.625)2

÷(2.288)2

+/-(0.268)2

+(0.054)2

+ 0.49 + 0.33 O'STA 2.20 % RTP Input 4.1, STA Section 5.6.8, states Z is equal to the following:

Z = I(Adjusted NTSP) -(Operational-Limit)l Input 4.1, Section 5.6.8, states that Adjusted NTSP is the selected setpoint minus ALTL (more conservative).

Since Adjusted NTSP is (NTSP-ALTL), Z is equal to the following:

Z= NTSP -ALT -(Operational_

Limit)(USTA)In Input 4.2, Sections 1.3 and 1.7, GEH defines the Operational Limit (OL) as 100 % RTP for MNGP. Therefore:

z = (119.5 -1.334 -100.0)%RTP (2.20)%RTP Z= 8.25 As specified in Input 4.1, Section 5.6.8, Z should be equal to or greater that 1.65 for the setpoint to be adequately separated from the Operational Limit to reasonably avoid Spurious trip conditions.

Since the actual value of 8.25 is greater than the required value of 1.65, an adequate separation exists between the NTSP and the Operational Limit (OL), andthe STA criterion is satisfied.

MONTICELLO NUCLEAR GENERATING PLANT CA-08-050 TITLE: I Instrument Setpoint Calculation

-Revision 0 Average Power Range Monitor (APRM) Non-Flow Biased PRNM Setpoints for CLTP and EPU Page 31 of 58 7.4.2 PRNM CLTP: APRM Neutron Flux -Hich (Setdown)

Scram and APRM Neutron Flux -High (Setdown)

Rod Block Input 4.2, Section 3, states that the following Analytical Limit (AL) and the following recommended Allowable Valve (AV) and the Nominal Trip Setpoint (NTSP): PRNM CLTP Setpoints (% RTP) AL AV NTSP APRM Neutron Flux- High (Setdown)

Scram N/A 20.0 18.0 APRM Neutron Flux -High (Setdown)Rod Block N/A 15.0 13.0 Input 4.2 shows that Setdown Scram and Setdown Rod Block functions do not have AL. These functions only have AV and NTSP. This calculation will determine the minimum required margin for AL to AV, and AL to NTSP. The difference between the minimum required margins for AL to AV, and AL to NTSP becomes the minimum required margin for AV to NTSP.7.4.2.1 Minimum Required Margin (AL to AV) Evaluation Input 4.11, Section 1.2.3.2, provides the following formula for calculation the AV from the AL.A V5 AL(1.645>(A)

+ (C, + (PMA) + (PEA)' bias Minimum required margin between the AL and AV and be defined by: A)1.645VA

+(CL)2 +(APMAL)2 +(APEAL)2 +APEAb Minimum Required Margin (AL -AV) = RM = AL -AV RM = AL -AV = (1"645(0.253)2

+ (1.334)2_+(2.288)2

+ (0.268)2+

(0.490)RM = AL -AV = 2.69 % RTP MONTICELLO NUCLEAR GENERATING PLANT CA-08-050 TITLE: Instrument Setpoint Calculation

-Revision 0 Average Power Range Monitor (APRM) Non-Flow Biased PRNM Setpoints for CLTP and EPU Page 32 of 58 7.4.2.2 Minimum Required Margin (AL to NTSP) Evaluation Input 4.11, Section 1.2.3.3, provides the following formula for calculating the AV from the AL: N(S.65) + (CL)' +/- (DL) +(PM4) 2 + (PEA4)2 +/-bNa Minimum required margin between AL and NTSP can be defined by: (1.645(AL)2+ (CL)2+ (DL)J 2 + (APMAL)2 +,(APEAL)2 +(DPEAL) +APEAb +/-DPEA, Minimum Required Margin (AL -NTSP) RM = AL -NTSP RM = AL -NTSP=RM = AL -NTSP = 3.08 % RTP 7.4.2.3 Minimum Required Margin (AV to NTSP) Evaluation*

I I I I RM = AV- NTSP =Minimum Required Margin (AL to NTSP) -Minimum Required Margin (AL to AV)RM = AV to NTSP = (3.08-2.69)

% RTP RM = AV to NTSP = 0.39 % RTP Available Minimum PRNM CLTP Setpoints AV NTSP Margin Required AV (% RTP) AV-NTSP) Margin Acceptable APRM Neutron Flux -(Setdown)

Scram 20.0 18.0 2.0 0.39 Yes APRM Neutron Flux -(Setdown)

Rod Block 15.0 13.0 2.0 0.39 Yes Since the available margin is greater than the minimum required margin (2.0 %RTP versus 0.39 % RTP), the recommended NTSP is acceptable.

MONTICELLO NUCLEAR GENERATING PLANT CA-08-050 TITLE: Instrument Setpoint Calculation

-Revision 0 Average Power Range Monitor (APRM) Non-Flow Biased PRNM Setpoints for CLTP and EPU Page 33 of 58 7.4.2.4 Licensee Event Report (LER) Avoidance Test The purpose of the LER Avoidance Test is to assure that there is sufficient margin between the AV and NTSP to reasonably avoid violation of the AV.Input 4.11, Section 1.2.3.5, provides the following formula for determining LER avoidance criteria.0 LER V(AL,)2 +(C,)" ++/-(DL)2 where n is the number of the standard deviations used (2 or)0-LER = (o253)2 +(1334)2 +(0.625 2-LER = 0.75 % RTP For multiple instrument channels, a Z value of greater than 0.81 provides sufficient margin between the NTSP and AV as specified in ESM-03.02-APP-l, Section 5.6.3 (Input 4.1).In accordance with Input 4.1, Section 5.6.3, Z is defined as: z- IAV-NTSPI 0-LER For APRM Neutron Flux -High (Setdown)

Scram setpoint: Z =(20"0-18"0)%RTPI

-2.66 (0.75)%RTP For APRM Neutron Flux -High (Setdown), Rod Block setpoint: Z 1(15.O-13"O)%RTPI 2.66 (0.75)%RTP Since Z is greater than 0.81, sufficient margin exists between the specified AV and NTSP.Minimum margin NTSP 2 will be calculated using the minimum Z value of 0.81.Minimum margin NTSP 2 will be compared with the current NTSP of 18.0 %RTP. This will indicate the amount of conservatism for the NTSP:

MONTICELLO NUCLEAR GENERA TING PLANT CA-08-050 TITLE: Instrument Setpoint Calculation

-Revision 0 Average Power Range Monitor (APRM) Non-Flow Biased PRNM Setpoints for CLTP and EPU Page 34 of 58 NTSP 2 Offset is defined as the minimum required margin between AV and NTSP with Z of 0.81 used.NTSP 2 Offset = Z x -LER NTSP 2 Offset = (0.81 x 0.75)-% RTP= 0.61 % RTP APRM Neutron Flux -High (Setdown)

Scram Setpoint For APRM Neutron Flux -High (Setdown)

Scram setpoint:

NTSP 2 is calculated to provide a NTSP based on the minimum LER avoidance criteria: NTSP 2 <_ AV -NTSP 2 Offset NTSP2(Setdown Scram) -(20.0 -0.61) % RTP NTSP2(Setdown Scram) < 19.4 % RTP For the minimum valve of Z equal to 0.81, NTSP 2 , which is defined as the LER Avoidance NTSP, is to be less than 19.4 % RTP.Therefore, a conservative NTSP of 18.0 % RTP is used for the APRM Neutron Flux -High (Setdown)

Scram setpoint.APRM Neutron Flux -High (Setdown)-

Rod Block Setpoint For APRM Neutron Flux -High (Setdown)

Rod Block setpoint:

NTSP 2 is calculated below to indicate margin of the recommended NTSP: NTSP 2 _< AV -NTSP 2 Offset NTSP2(setdown Rod Block) (15.0 -0.61) % RTP NTSP2(Setdown Rod Block) < 14.4 % RTP For the minimum valve of Z equal to 0.81, NTSP 2 , which is defined as the LER Avoidance NTSP, is to be less than 14.4 % RTP.Therefore, a conservative NTSP of 13.0 % RTP is used for the APRM Neutron Flux -High (Setdown)

Rod Block setpoint.Attachment 1, Setpoint Diagrams, shows the setpoint margin for CLTP APRM Neutron Flux -High (Setdown)

Scram and APRM Neutron Flux -High (Setdown)

Rod Block setpoints.

MONTICELLO NUCLEAR GENERATING PLANT CA-08-050 TITLE: Instrument Setpoint Calculation

-Revision 0 Average Power Range Monitor (APRM) Non-Flow Biased PRNM Setpoints for CLTP and EPU Page 35 of 58 7.4.2.5 Spurious Trip Avoidance (STA) Test A Spurious Trip Avoidance test is performed to assure that there is a reasonable probability that spurious trips will not occur using the selected setpoint.Input 4.11, Section 1.2.3.4, provides the following formula for determining Spurious Trip avoidance.

Input 4.13, Sections 4.5.4.b and 4.5.9.b, provides setpoint guidance to add bias term for APEA.oT(STA (!(A )2+(C )2 +(D,)2 +(pM4)2 +(PEA)2 + APEAb Where n is the number of standard deviations used (2 o-)Terms DPEAL and DPEAb were defined and evaluated in Section 7.3.1.7.These terms are to be included in the above aSTA equation as follows: O's / V(AL)2 +/-(CL;2 + (D,)2 + (PMA)2 +(pEA)2 +(DpEAL)2 + APEAb + DPEAb Using APRM terms, u-sTA is defined as: ('STA = (AL) +(CL)2 +(DL)2 +(APA)2 +(APEA)2 +(DPEAL)2+ APEAb+ DPEAb V(TAj J0.253)2 +(1.334)2

+(0.625)2

++/-(2.288)2

+ (0.268)' + (0.054)2 + 0.49+0.33 CSTA = 2.20 % RTP Input 4.1, STA Section 5.6.8, states Z.is equal to the following:

S=(Adjusted

-NTSP) -(Operational

_Limit)ý'STA Input 4.1,Section 5.6.8, states that Adjusted NTSP is the selected setpoint minus ALTL (more conservative).

Since Adjusted NTSP is (NTSP-ALTL), Z is equal to the following:

..... ...... ..MONTICELLO NUCLEAR GENERATING PLANT CA-08-050 TITLE: Instrument Setpoint Calculation

-Revision 0 Average Power Range Monitor (APRM) Non-Flow Biased PRNM Setpoints.

for CLTP and EPU Page 36 of 58 Z= [NTSP -ALT -(Operational Limit)]USTA Input 4.2, Section 1.1, defines the Operational Limit for the APRM Neutron Flux-High (Setdown)

Scram as 11.0 % RTP.z- (18.0-1.334-11.0)%RTP (2.20)%RTP Z= 2.57 As specified in Input 4.1, Section 5.6.8, Z should be'equal to or greater that 1.65 for the setpoint to be adequately separated from the Operational Limit to reasonably avoid Spurious trip conditions.

Since the actual value of 2.57 is greater than the required value of 1.65, an adequate separation exists between the NTSP and the Operational Limit (OL), and the STA criterion is satisfied.

7.4.3 PRNM CLTP -APRM Downscale Rod Block Input 4.2 for PRNM CLTP setpoints does not address the Downscale Rod Block setpoint for PRNM CLTP operation.

Input 4.8, Item 12, provides recommended AV and NTSP setpoints indicated below.The PRNM CLTP APRM Downscale Rod Block setpoint is the same as the current CLTP setpoint.PRNM CLTP Setpoint% RTP AL AV NTSP APRM Downscale Rod Block N/A 2.0 3.5 Input 4.8, Item 12, indicates that the APRM Downscale Rod Block function does not have an AL. This calculation will determine the minimum required margin for AL to AV, and AL to NTSP. The difference between the minimum required margins for AL to AV, and AL to NTSP becomes the minimum required margin for AV to NTSP.7.4.3.1 Minimum Required Margin (AL to AV) Evaluation Input 4.11, Section 1.2.3.2, provides the following formula for calculation the AV from the AL.

MONTICELLO NUCLEAR GENERATING PLANT CA-08-050 TITLE: Instrument Setpoint Calculation

-Revision 0 Average Power Range Monitor (APRM) Non-Flow Biased PRNM Setpoints for CLTP and EPU Page 37 of 58 A V <_AL -V(AL)2 + (CL)2+(PMA)2+(PEA)2

+/-bias Minimum required margin between AL and AV can be defined by:--1.645>) ) +(CL)2 +(APMAL)2 +(APEAL)2 +APEAb Minimum Required Margin (AL -AV) = RM = AL -AV RM~~~ _ =A A=(.4>0.253)2

+(1.334)2+

(2.288) + (0.268)2 +(0.490)RM =AL -AV =2.69 % RTP 7.4 3.2 Minimum Required Margin (AL to NTSP) Evaluation Input 4.11, Section 1.2.3.3, provides the following formula for calculating the AV from the AL: NPSP < ALj)Z (CL)2 + (DL )2 + 2 +((pE)2 +_ bias Minimum required margin between AL and NTSP can be defined by: 1.645>(AL ) +(CL)2 +(DL)' +(APMAL)2 + (APEAL)2 + (DPEAL)+ +APEAb1 DPEb Minimum Required Margin (AL -NTSP) RM = AL -NTSP RM =AL -NTSP-(1-64-1V(0.253)2

+ (1. 334)2 + (0.625)21+(2.288)2

+(9.268)2

+(0.054)2

+ 0.49 + 0.33 RM = AL -NTSP = 3.08 % RTP MONTICELLO NUCLEAR GENERATING PLANT CA-08-050 TITLE: Instrument Setpoint Calculation

-Revision 0 Average Power Range Monitor (APRM) Non-Flow Biased PRNM Setpoints for CLTP and EPU. Page 38 of 58 7.4.3.3 Minimum Required Marvin (AV to NTSP) Evaluation

= RM = AV to NTSP RM = AV to NTSP-Minimum Required Margin (AL to NTSP) -Minimum Required Margin (AL to AV)RM = AV to NTSP = 3.08 % -2.69 % % RTP RM = AV to NTSP = 0.39 % RTP Available Minimum PRNM CLTP AV NTSP Margin Required AV Setpoint (% RTP) (NTSP-AV)

Margin Acceptable APRM Downscale Rod Block 2.0 3.5 1.5 0.39 Yes Since the available margin is greaterlthan the minimum required margin (1 5 %RTP versus 0.39 % RTP), the recommended NTSP is acceptable.

7.4.3.4 Licensee Event Report (LER) Avoidance Test The purpose of the LER Avoidance Test is to assure that there is sufficient margin between the AV and NTSP to reasonably avoid violation of the AV.Input 4.11, Section 1.2.3.5, provides the following formula for determining LER avoidance criteria.O'LER Vj~(A )2 + (CL )2 ++/-(DL )where n is the number of the standard deviations used (2 -)GOLER VI.(0.253)2

+(1.334)2

+(0.625) 2-LER =0.75 % RTP For multiple instrument channels, a Z value of greater than 0.81 provides sufficient margin between the NTSP and AV as specified in ESM-03.02-APP-I, Section 5.6.3 (Input 4.1).In accordance with Input 4.1, Section 5.6.3, Z is defined as:

MONTICELLO NUCLEAR GENERA TING PLANT CA-08-050 TITLE: -Instrument Setpoint Calculation

-Revision 0 Average Power Range Monitor (APRM) Non-Flow Biased PRNM Setpoints for CLTP and EPU Page 39 of 58 IAV-NTSPI

-1(2.0-3.5)%RTPI-2-0 CrLER (0.75)%RTP Since Z is greater than 0.81, sufficient margin exists between the specified AV and NTSP.Minimum margin NTSP 2 will be calculated using the minimum Z value of 0.81.Minimum margin NTSP 2 will be compared with the current NTSP of 3.5 % RTP.This will indicate the amount of conservatism for the NTSP.NTSP 2 Offset is defined as the minimum margin (% RTP) between AV and NTSP 2 with Z of 0.81.NTSP 2 Offset = Z x OTLER NTSP 2 Offset = (0.81 x 0.75) % RTP = 0.61 % RTP NTSP 2 is calculated to provide an NTSP based on the minimum LER avoidance criteria: NTSP 2 > AV + NTSP 2 Offset NTSP 2 > 2.0 % RTP + 0.61 % RTP NTSP 2 > 2.61 % RTP For the minimum valve of Z equal to 0.81, NTSP 2 , which is defined as the LER Avoidance NTSP, is to be greater than 2.61 % RTP.Therefore, a conservative NTSP of 3.5 % RTP is used. Attachment 1, Setpoint Diagrams, shows the setpoint margin for CLTP APRM Downscale Rod Block setpoint.

MONTICELLO NUCLEAR GENERATING PLANT CA-08-050 TITLE: Instrument Setpoint Calculation

-Average Power Range Monitor (APRM) Non-Flow Biased PRNM Setpoints for CLTP and EPU Revision 0 Page 40 of 58 7.5 .PRNM EPU Operation Setpoint evaluation 7.5.1 PRNM EPU APRM Neutron Flux -Hiah Scram The setpoints that will be implemented for APRM Neutron Flux -High are defined in Input 4.8, Item 8. Input 4.3, GE's recommended setpoint document, has slight differences in the setpoints.

As shown in the table below,, Input 4.8 specifies slightly more conservative values for AV and NTSP. These EPU setpoints are the same values being used for PRNM CLTP operation.

PRNM EPU Setpoints

(% RTP) AL AV NTSP APRM Neutron Flux -High Scram Input 4.8, Item 8 125.0 122.0 119.5 GE Recommended Setpoints (not used)APRM Neutron Flux -High Scram Input 4.3 125.0 122.3 120.3 7.5.1.1 Allowable Value (AV) Evaluation Input 4.11, Section 1.2.3.2, provides the following formula for calculating the AV from the AL.AV!AL (65Jj(AL)2ý

+ (CL) + (PMA)2 -+ (PEA)2 +/-bias Minimum required margin between AL and AV can be defined by: 1 .6 4 5)(AL)' +(CL)2 +(APMAL)2 +(APEAL)2 +APEAb Minimum Required Margin (AL -AV) = RM = AL -AV RM = AL -AV= 2145I.253)2

+ (1.334)y + (2.288)y +(0.268) y+/-(0.490)RM = AL -AV = 2.69 % RTP MONTICELLO NUCLEAR GENERATING PLANT CA-08-050 TITLE: Instrument Setpoint Calculation

-Revision 0 Average Power Range Monitor (APRM) Non-Flow Biased PRNM Setpoints for CLIP and EPU Page 41 of 58 Available Marciin (AL -AV) = AM = AL -AV AM = AL -AV = (125.0 -122.0) % RTP AM = AL -AV = 3.0 % RTP Available Minimum EPU Setpoint AL AV Margin Required AV (% RTP) (AL- AV) Margin Acceptable APRM Neutron Flux -High Scram 125.0 122.0 3.0 2.69 Yes Since the available margin is greater than the minimum required margin (3.0 %RTP versus 2.69 % RTP), the recommended AV is acceptable.

7.5.1.2 Nominal Trip Setpoint (NTSP) Evaluation Input 4.11, Section 1.2.3.3, provides the following formula for calculating the AV from the AL.NPSP AL V6 2 5(AJ' + (CL) + (D,)' + (PML4) +(PEA)' +/-bias 2i Minimum required margin between AL and NTSPcan be defined by: (1.645)V(Al)'

+I(CL )2 + (DL )2 + (APMAL)2 ++/-(ApEA ) 2 + (DPEAj) + APEA b + DPEAb Minimum Required Margin (AL -NTSP) = RM = AL -NTSP RM = AL- NTSP =1 ) 2 + (1.334)2 + (0.65)2 (2.288)2 +(0.268)2

+(0.054)2

+ 0.49 + 0.33 RM = AL -NTSP = 3.08 % RTP

...................

i"- ...........

,_,.MONTICELLO NUCLEAR GENERATING PLANT CA-08-050 TITLE: Instrument Setpoint Calculation

-Revision 0 Average Power Range Monitor (APRM) Non-Flow Biased PRNM Setpoints for CLTP and EPU Page 42 of 58 Available Margqin (AL -NTSP) = AM = AL.- NTSP AM = AL -NTSP = (125.0 -119.5) % RTP AM = AL -NTSP = 5.5 % RTP Available Minimum PRNM EPU Setpoint AL NTSP Margin Required AV (% RTP) (AL- NTSP) Margin Acceptable APRM Neutron Flux 125.0 119.5 5.5 3.08 Yes-_High Scram Since the available margin is greater than the minimum required margin (5.5 %RTP versus 3.08 % RTP), the recommended the NTSP is acceptable.

7.5.1.3 Licensee Event Report (LER) Avoidance Test The purpose of the LER Avoidance Test is to assure that there is sufficient margin between the AV and NTSP to reasonably avoid violations of the AV.Input 4.11, Section 1.2.3.5, provides the following formula for determining LER avoidance criteria.ULER (AL)2 + (CL) + (DL )2 where n is the number of the standard deviations used (2 o-)-LER = V(0.253)2

+(1.334)2

+(0.625)2-LER 0.75 % RTP For multiple instrument channels, a Z value of greater than 0.81 provides sufficient margin between NTSP and AV as specified in ESM-03.02-APP-1, section 5.6.3 (Input 4.1).In accordance with Input 4.1, Section 5.6.3, Z is defined as: Z -jAV-NTSPl

_ 1(122.0-119.5)%RTP=

333 CLER (0.75)%RTP' Since Z is greater than 0.81, sufficient margin exists between the specified AV and NTSP.

MONTICELLO NUCLEAR GENERATING PLANT CA-08-050 TITLE: Instrument Setpoint Calculation

-Revision 0 Average Power Range Monitor (APRM) Non-Flow Biased PRNM Setpoints for CLTP and EPU Page 43 of 58 Minimum margin-NTSP 2 will be calculated using the minimum Z value of 0.81.Minimum margin NTSP 2 will be compared with the current NTSP of 119.5 %RTP. This will indicate the amount of conservatism for the NTSP.NTSP 2 Offset is defined as the minimum margin (% RTP) between AV and NTSP 2 with Z of 0.81 used.NTSP 2 Offset = Z X uLER NTSP 2 Offset = (0.81 x 0.75) % RTP = 0.61 % RTP NTSP 2 is calculated to provide an NTSP based on the minimum LER avoidance criteria: NTSP 2 < AV -NTSP 2 Offset NTSP 2 _122.0 % RTP -0.61 % RTP NTSP 2 <121.4%RTP For the minimum valve of Z equal to 0.81, NTSP 2 , which is defined as the LER Avoidance NTSP, is to be less than 121.4 % RTP.A conservative NTSP of 119.5 % RTP is used.7.5.1.4 Spurious Trip Avoidance (STA) Test A spurious trip avoidance test is performed to assure that there is a reasonable probability that spurious trips will not occur using the selected setpoint.Input 4.11, Section 1.2.3.4, provides the following formula for determining Spurious Trip avoidance.

Input 4.13, Sections 4.5.4'b and 4.5.9.b, state that any bias associated with PMA or PEA should also be included.

Therefore, APEAb shown in EPU Loop Uncertainty table in Section 7.3.2 is being included.oCS z (AL)2 + (CL)2 + (DL)2 + (PMA)2 + (PEA)2 + APEAb where n is the number of standard deviations used (2c-)Terms DPEAL and DPEAb were defined and evaluated in Section 7.3.1.7 for CLTP operation but also apply to EPU operation as discussed in Sections 7.3.2 and 7.3.2.1. These terms are to be included in the above srTAequation as follows:

MONTICELLO NUCLEAR GENERATING PLANT CA-08-050 TITLE: Instrument Setpoint Calculation

-Revision 0 Average Power Range Monitor (APRM) Non-Flow Biased PRNM Setpoints for CLTP and EPU Page 44 of 58 0 STA (A,) +(C,)' +(D,)2 + (pM) +(pEA) +(DpEL) +APEAb + DPEAb Using APRM terms, -,A is defined as:~SA=J4,J1A)

+(L) +(DL)2+ -(APMA)2 + (APE) +(A) +/-APEA b + DPE,4b= V 1/(0.2 5 3)2 +(1.334)2

+(0.625)2

+-(2.288)2

+(0.268)2+

(0.054)2 +0.49+0.33 USIA = 2.20 % RTP Input 4.1, Section 5.6.8, states Z is equal to the following:

SI(Adjusted NTSP) -(Operational Limit)ýcYSTA Input 4.1, Section 5.6.8, states that Adjusted NTSP is the selected setpoint minus ALTL (more conservative).

Since Adjusted NTSP is (NTSP-ALTL), Z is equal to the following:

NTSP -ALT -(Operational Limit)'STA In Input 4.3, Sections 1.3 and 1.7, GEH defines the Operational Limit for MNGP as 100%(119.5 -1.334 -100.0)%RTP (2.20)%RPT Z = 8.25 In accordance with Input 4.1, a minimum value of Z is to be 1.65. Since the actual value of 8.25 is greater than the required value of 1.65, adequate separation exists between the NTSP and the Operational Limit (OL), and the STA criterion is satisfied.

MONTICELLO NUCLEAR GENERATING PLANT CA-08-050 TITLE: Instrument Setpoint Calculation

-Revision 0 Average Power Range Monitor (APRM) Non-Flow Biased PRNM Setpoints for CLTP and EPU Page 45 of 58 7.5.2 EPU APRM Neutron Flux -High (Setdown)

Scram and APRM Neutron Flux-High (Setdown)

Rod Block Input 4.3, Section 3, specifies the following Analytical Limit (AL) and the following recommended Allowable Value (AV) and the Nominal Trip Setpoint (NTSP): PRNM EPU Setpoints (% RTP) AL AV NTSP APRM Neutron Flux -High (Setdown)

Scram N/A 20.0 18.0 APRM Neutron Flux -High (Setdown)

Rod Block N/A 15.0 13.0 Input 4.3 indicates that Setdown Scram and Setdown Rod Block functions do not have AL. These functions only have AV and NTSP. This calculation will determine theminimum required margin for AL to AV, and AL to NTSP. The difference between the minimum required margins for AL to AV, and AL to NTSP becomes the minimum required margin for AV to NTSP.7.5.2.1 Minimum Required Margin (AL to AV) Evaluation Input 4.11, Section 1.2.3.2, provides the following formula for calculating the AV from the AL.AV: AL -1 5ý(AL) + (CL)' 4(M) +(E)2 +/-bias Minimum required margin between AL and AV can be defined by:-.645-(A)2 +(CL)2 +(APMAL )2 +((APEAL )2 +APEAb Minimum Required Margin (AL -AV) = RM = AL -AV RM = AL -AV = ( 2 j(0.253)2

+(1.334)2

+(2.288)2

+(0.268)2

+(0.490)RM = AL -AV = 2.69 % RTP 7.5.2.2 Minimum Reauired.

Margin (AL to NTSP) Evaluation Input 4.11, Section 1.2.3.3, provides the following formula for calculating the NTSP from the AL.

MONTICELLO NUCLEAR GENERATING PLANT CA-08-050 TITLE: Instrument Setpoint Calculation

-Revision 0 Average Power Range Monitor (APRM) Non-Flow Biased PRNM Setpoints for CLTP and EPU Page 46 of 58 1...1645 " NTSP AL- ]V(AL) +(CL)2 +(DL)2 +(PMA)2 +(PEA)2 +/-bias Minimum required margin between AL and NTSP can be expressed as:-1.645 (AY ++/-(CL )2 +-(DJ) +(APMAL)2 +(APEAL)2 +(DPEAL)2 +APEAb +DPE'b Minimum Required Margqin (AL -NTSP) RM = AL -NTSP RM = AL- NTSP=1. 6~4 5 )V(0.253)2

+ (1.*334) 2 + (0.625)2 + (2.288)2 + (0.268)2 + (0.054)' + 0.49 + 0.33 RM = AL -NTSP = 3.08 % RTP 7.5.2.3 Minimum Required Margin (AV to NTSP) Evaluation RM = AV to NTSP=Minimum Required Margin (AL to NTSP) -Minimum Required Margin (AL to AV)RM = AV to NTSP = 3.08 % RTP -2.69 % RTP RM = AV to NTSP = 0.39 % RTP Available Minimum PRNM EPU Setpoint AV NTSP Margin Required AV (% RTP) (AV- NTSP) Margin Acceptable APRM Neutron Flux -High (Setdown)

.20.0 18.0 2.0 0.39 Yes Scram APRM Neutron Flux-High (Setdown) 15.0 13.0 2.0 0.39 Yes Rod Block _Since the available margin is greater than the minimum required margin (2.0 %RTP versus 0.39 % RTP), the recommended NTSP is acceptable.

---

.--.,-.---..--.-.-...-.-.....-.-

.--l-..---...~-.-....-.-.-.---.--..--.--.-~---.-.

..MONTICELLO NUCLEAR GENERATING PLANT CA-08-050 TITLE: Instrument Setpoint Calculation

-Revision 0 Average Power Range Monitor (APRM) Non-Flow Biased PRNM Setpoints for CLTP and EPU Page 47 of 58 7.5.2.4 Licensee Event Report (LER) Avoidance Test The purpose of the LER Avoidance Test is to assure that there is sufficient margin between the AV and NTSP to reasonably avoid violation of the'AV.Input 4.11, Section 1.2.3.5, provides the following formula for determining LER avoidance criteria.C7LER (AL)2 (CL)2 +(DL)'where n is the number of the standard deviations used (2 o-)., ULER =0.75 % RTP For multiple instrument channels, a Z value of greater than 0.81 provides sufficient margin between NTSP and AV as specified in ESM-03.02-APP-1, Section 5.6.3 (Input 4.1).In accordance with Input 4.1, Section 5.6.3, Z is defined as: z IA v- NTSP ULER For APRM Neutron Flux -High (Setdown)

Scram setpoint: Z = 1(20.0 -18.0)%RTPJ

= 2.66 (0.75)%RTP For APRM Neutron Flux -High (Setdown)

Rod Block setpoint: Z = l(5.0-13.0)%RTPI

= 2.66 (0.75)%RTP Since Z is greater than 0.81, sufficient margin exists between the specified AV and NTSP.Minimum margin NTSP 2 will be calculated using the minimum Z value of 0.81.Minimum margin NTSP 2 will be compared with the current NTSP of 18.0 %RTP. This will indicate the amount of conservatism for the NTSP.NTSP 2 Offset is defined as the minimum required margin between AV and NTSP with Z of 0.81 usdd.

MONTICELLO NUCLEAR GENERATING PLANT CA-08-050 TITLE: Instrument Setpoint Calculation

-Revision 0 Average Power Range Monitor (APRM) Non-Flow Biased PRNM Setpoints for CLTP and EPU Page 48 of 58 NTSP 2 Offset = Z x -LER NTSP 2 Offset = (0.81 x 0.75) % RTP = 0.61 % RTP5 APRM Neutron Flux -High (Setdown)

Scram Setpoint For APRM Neutron Flux -High (Setdown)

Scram setpoint:

NTSP 2 is calculated to provide a NTSP based on the minimum LER avoidance criteria: NTSP 2 _< AV -NTSP 2 Offset NTSP 2 (Setdown Scram) -< (20.0 -0.61) % RTP NTSP2(setdown Scram) . 19.4 % RTP For the minimum valve of Z equal to 0.81, NTSP 2 , which is defined as the LER Avoidance NTSP, is to be less than 19.4 % RTP.Therefore, a conservative NTSP of 18.0 % RTP is used for the APRM Neutron Flux -High (Setdown)

Scram setpoint.APRM Neutron Flux -High (Setdown)

Rod Block Setpoint For APRM Neutron Flux -High (Setdown)

Rod Block setpoint: NTSP 2 is calculated below to indicate margin of the recommended NTSP: NTSP 2 _< AV -NTSP 2 Offset NTSP2(Setdown Rod Block) -(15.0 -0.61) % RTP NTSP2(Setdown Rod Block) -14.4 % RTP For the minimum valve of Z equal to 0.81, NTSP 2 , which is defined as the LER Avoidance NTSP, is to be less than 14.4 % RTP.Therefore, a conservative NTSP of 13.0 % RTP is used for:the APRM Neutron Flux -High (Setdown)

Rod Block setpoint 7.5.2.5 Spurious Trip Avoidance (STA) Test A Spurious Trip Avoidance test is performed to assure that there is a reasonable probability that spurious trips will not occur using the selected setpoint.

MONTICELLO NUCLEAR GENERATING PLANT CA-08-050 TITLE: Instrument Setpoint Calculation

-Revision 0 Average Power Range Monitor (APRM) Non-Flow Biased PRNM Setpoints for CLTP and EPU Page 49 of 58 Input 4.11, Section 1.2.3.4, provides the following formula for determining Spurious Trip avoidance.

Input 4.13, Sections 4.5.4.b and 4.5.9.b, provides setpoint guidance to add bias term for APEA.U'STA = V(AL)2 +(C,)2 +(DL)2 +(PA)2 + (PEA)2 +APEA, Where n is the number of standard deviations used (2 c).Terms DPEAL and DPEAb were defined and evaluated in Section 7.3.1.7 for CLTP operation but also applies to EPU operation as discussed in Section 7.3.2 and 7.3.2.1. These terms are to be included in the above uA equation as follows: UsA =(I)>(AL)2

+(CL)2 +(DL)2 + (PMA)2 + (PEA)2 + (DPEAL)2 +APEAb +DPEAb Using APRM terms, uA is defined as: cYTA =(i(AL)2 ++/-(CL)' +/-(DL )2 ++/-(APAMA)2 + (APEA)2 + (DPEAL )2 ++/-APEAb +DPEAb* 7 (Vl(0.253)2

+(1.334)2

+ (0.62 5)' + (2.2 88) 2 + (0.2 68) 2 +(0.054)2

+0.49+0.33-stA = 2.20 % RTP Input 4.1, STA Section 5.6.8, states Z is equal-to the following:

Z =(Adjusted NTSP) -(Operational Limit)0 USTA Input 4.1, Section 5.6.8, states that Adjusted NTSP is the selected setpoint minus ALTL (more conservative).

Since Adjusted NTSP is (NTSP-ALTL), Z is equal to the following:

Z= NTSP -ALT -(Operational

_ Limit)Cr STA Input 4.3, Section 1.1, states the Operational Limit is 11.0%Z= (18.0 -1.334 -11.O)%RTP (2.20)%RTP Z- 2.57 MONTICELLO NUCLEAR GENERATING PLANT CA-08-050 TITLE: Instrument Setpoint Calculation

-Revision 0 Average Power Range Monitor (APRM) Non-Flow Biased PRNM Setpoints for CLTP and EPU Page 50 of 58 As specified in Input 4.1, Section 5.6.8, Z should be equal to or greater that 1.65 for the setpoint to be adequately separated from the Operational Limit to reasonably avoid Spurious trip conditions.

Since the actual value of 2.57 is greater than the required value of 1.65, an adequate separation exists between the NTSP and the Operational Limit (OL), and the STA criterion is satisfied.

7.5.3 PRNM EPU APRM Downscale Rod Block This section of the calculation provides the basis for the NTSP setpoint to be 3.5% RTP. The existing CLTP and PRNM CLTP NTSP setpoints (Section 7.4.3)are also 3.5 % RTP. EPU Input 4.3, Section 1.8, indicates the recommended NTSP setpoint is 4.0 % RTP. This section shows there is sufficient margin to keep the NTSP setpoint at 3.5 % RTP. Input 4.8, Item 12, also indicates the NTSP setpoint as 4.0 % RPT for EPU. This calculation provides the design basis to keep the setpoint at 3.5 % RTP.Input 4.3 and Input 4.8 indicate the APRM Downscale Rod Block does not have an Analytical Limit (AL) setpoint.

Both Inputs state the recommended value for the Allowable Valve (AV) is 2.0 % RTP. This section will evaluate the following Setpoints:

PRNM EPU Setpoint (% RTP) AL AV NTSP APRM Downscale Rod Block N/A 2.0 3.5 This calculation will determine the minimum required margin for AL to AV, and AL to NTSP. The difference between the minimum required margins for AL to AV, and AL to NTSP becomes the minimum required margin for AV to NTSP.7.5.3.1 Minimum Required Margin (AL to AV) Evaluation Input 4.11, Section 1.2,3.2, provides the following formula for calculation the AV from the AL.AV AL -1645 (AL)2 + (CL)2 + (PA/)2+ (PEA)2 _bias Minimum required margin between AL and AV can be defined by:

MONTICELLO NUCLEAR GENERATING PLANT CA-08-050 TITLE: Instrument Setpoint Calculation

-Revision 0 Average Power Range Monitor (APRM) Non-Flow Biased PRNM Setpoints for CLTP and EPU Page 51 of 58 (1. 645>ý(A)2

+ (CL)2 + (APMAL4)2 + (APEAL )2 + APEA, Minimum Required Margin (AL -AV) = RM = AL -AV RM = AL -AV = 1 (0.253)2 + (1.334)2 + (2.288)2 + (0.268)2 + (0.490)RM = AL -AV = 2.69 % RTP 7.5.3.2 Minimum Required Margin (AL to NTSP) Evaluation Input 4.11, Section 1.2.3.3, provides the following formula for calculating the.AV from the AL:

NPSP <U- 2-45(AL)2

+(CL)Y +(DL)2 +(PMA)2 +(PEA)2 +/-bias Minimum required margin between AL and NTSP can be defined by::

+(CL)2 +(DL)2 +(APMA.)2 +(APEAL)2 +(DPEAL)2 +APEAb +DPEAb Minimum Required Margin (AL -NTSP) = RM = AL -NTSP RM = AL -NTSP =S15j J(ý0.253)

+ (1 *334) + (0.6ý25)2+

(2.288)2 +(0.2ý68)2+

(0.054)2 +0.49 +/-0.33 RM = AL -NTSP = 3.08 % RTP 7.5.3.3 Minimum Required Margin (AV to NTSP) Evaluation

-RM = AV to NTSP RM = AV to NTSP Minimum Required Margin (AL to NTSP) -Minimum Required Margin (AL to AV)RM = AV to NTSP = 3.08 % RTP -2.69 % RTP RM = AV to NTSP = 0.39 % RTP MONTICELLO NUCLEAR GENERA TING PLANT CA-08-050 TITLE: Instrument Setpoint Calculation

-Revision 0 Average Power Range Monitor (APRM) Non-Flow.Biased PRNM Setpoints for CLTP and EPU Page 52 of 58 Since the available margin is greater than the minimum required margin (1.5 %RTP versus 0.39 % RTP), the recommended NTSP is acceptable.

7.5.3.4 Licensee Event Report (LER) Avoidance Test The purpose of the LER Avoidance Test is to assure that there is sufficient margin between the AV and NTSP to reasonably avoid violation of the AV.Input 4.11, Section 1.2.3.5, provides the following formula for determining LER avoidance criteria.)JE,(AL)+ (C,)Y + (D,)where n is the number of the standard deviations used (2 u-)ULER = (0.253)2 +(1.334)2

+(0.625)2 CraR =0.75 % RTP For multiple instrument channels, a Z value of greater than 0.81 provides sufficient margin between the NTSP and AV as specified in ESM-03.02-APP-I, Section 5.6.3 (Input 4.1).In accordance with Input 4.1, Section 5.6.3, Z is defined as: Z -IAV- NTSPI _ 1(2.0-3.5)1%RTP

= 2.0 CLER (0.75)%RTP Since Z is greater than 0.81, sufficient margin exists between the specified AV and NTSP.Minimum margin NTSP 2 will be calculated using the minimum Z value of 0.81.Minimum margin NTSP 2 will be compared with the current NTSP of 3.5 % RTP.This will indicate the amount of conservatism for the NTSP..NTSP 2 Offset is defined as the minimum margin (% RTP) between AV and NTSP 2 with Z of 0.81.NTSP 2 Offset = Z x '-LER NTSP 2 Offset = (0.81 x 0.75) % RTP = 0.61 % RTP MONTICELLO NUCLEAR GENERATING PLANT CA-08-050 TITLE: Instrument Setpoint Calculation

-Revision 0 Average Power Range Monitor (APRM) Non-Flow Biased PRNM Setpoints for CLTP and EPU Page 53 of 58 NTSP 2 is calculated to provide an NTSP based on the minimum LER avoidance criteria: NTSP 2 AV + NTSP 2 Offset NTSP 2 2.0 %RTP + 0.61 % RTP NTSP 2 2 -61 % RTP For the minimum valve of Z equal to 0.81, NTSP 2 , which is defined as the LER Avoidance NTSP, is to be greater than 2.61 % RTP.Therefore, a conservative APRM Downscale Rod Block NTSP setpoint of 3.5% RTP is to be used.

MONTICELLO NUCLEAR GENERATING PLANT CA-08-050

• TITLE: Instrument Setpoint Calculation

-Revision 0 Average Power Range Monitor (APRM) Non-Flow Biased PRNM Setpoints for CLTP and EPU Page 54 of 58 8. CONCLUSIONS The Analytical Limits (AL), Allowable Values (AV), and Nominal Trip Setpoints (NTSP), for APRM Neutron*Flux High Scram, Setdown Scram, Setdown Rod Block and APRM Downscale Rod Block are listed below for EC-10856, which includes NUMAC PRNMS setpoints at CLTP and EPU conditions.

8.1 Loop Uncertainties for PRNM CLTP and EPU Operation Term Value Section AL- Loop Instrument Accuracy +/- 0.253 % RTP 7.3.1.1 DL -Loop Instrument Drift +/- 0.625 % RTP 7.3.1.2 ALTL -Loop As-Left Tolerance for uncertainty calculations

+/- 1.334 % RTP 7.3.1.3 ALTL -Loop As-Left Tolerance for PRNM electronic calibration 0.00 % RTP 7.3.1.3 AFTL -Loop As-Found Tolerance for uncertainty calculations

+/- 1.334 % RTP 7.3.1.4 AFTL -Loop As-Found Tolerance for PRNM electronic calibration 0.00 % RTP 7.3.1.4 CL -Loop Calibration Accuracy Error +/- 1.334 % RTP 7.3.1.5 APEAL -Loop APRM Primary Element Accuracy +/- 0.268 % RTP 7.3.1.6 DPEAL -Loop Drift Primary Element Accuracy +/- 0.054% RTP 7.3.1.7 APMAL -Loop APRM Process Measurement Accuracy +/- 2.288 % RTP 7.3.1.8 APEAb- APRM Primary Element Accuracy bias +0.49 % RTP bias 7.3.1.6 DPEAb -Drift Primary Element Accuracy bias + 0.33 % RTP bias 7.3.1.7 MONTICELLO NUCLEAR GENERATING PLANT CA-08-050 TITLE: Instrument Setpoint Calculation

-Revision 0 Average Power Range Monitor (APRM) Non-Flow Biased PRNM Setpoints for CLTP and EPU Page 55 of 58 8.2 PRNM -CLTP Operation Setpoint (EC-1 0856)PRNM CLTP Setpoint Setpoint, % RTP AL AV NTSP 125.0 i22.0 119.5 APRM Neutron Flux- High Scram APRM Neutron Flux -High (Setdown)

Scram N/A 20.0 18.0 APRM Neutron Flux -High (Setdown)

Rod Block N/A 15.0 13.0 APRM Downscale Rod Block N/A 2.0 3.5 8.3 PRNM -EPU Operation Setpoint (EC-1.0856)

PRNM EPU Setpoint Setpoint, % RTP AL AV NTSP APRM Neutron Flux- High Scram 125.0 122.0 119.5 APRM Neutron Flux -High (Setdown)

Scram N/A 20.0 18.0 APRM Neutron Flux- High (Setdown)

Rod Block N/A 15.0 13.0 APRM Downscale Rod Block. NA 2.0 3.5 9. FUTURE NEEDS This calculation impacts the following documents, which are listed in EC-1 0856: 9.1 Calculation CA-05-153, Rev 0, Instrument Setpoint Calculation

-APRM Downscale CR Block, calculated the APRM Downscale CR Block NTSP setpoint of 3.5 % RTP for ITS and CLTP operation.

PRNM CLTP operation does not change this setpoint.

For PRNM EPU operation, NTSP setpoint of 3.5 % RTP has also been evaluated in accordance with Section 7.5.3. CA-05-153 will be superseded when PRNM retrofit is installed because the PRNM uncertainties are used as the basis for the APRM Downscale Rod Block setpoint.

GAR 01146760 was initiated to track calculation CA-05-0153 be superseded due to EC 10856.

MONTICELLO NUCLEAR GENERATING PLANT CA-08-050 TITLE: Instrument Setpoint Calculation

-Revision 0 Average Power Range Monitor (APRM) Non-Flow Biased PRNM Setpoints for CLTP and EPU Page 56 of 58 9.2 Calculation CA-96-224, Rev 1, Instrument Setpoint calculation

-APRM Flow-Biased Upscale Scram and Rod Block, includes the APRM Flow-Referenced Neutron Flux -High High setpoint.

PRNM changes this setpoint to non-flow bias APRM Neutron Flux High.. The current setpoint of 0.66W + 67.6 % RTP clamped at 122 % RTP is being changed to 122 % RTP. This applies to PRNM CLTP and EPU operation.

GAR 01146761 was initiated to track calculation CA-96-224 be superseded due to EC 10856.9.3 Procedure C.6-005-A-03, Rev 1, Rod Withdraw Block. This is the annunciator procedure for window 5-A-3. PRNMS adds a new rod withdraw block setpoint: APRM Neutron Flux -High (Setdown)

Rod Block. Sections 7.4.2 and 7.5.2 evaluate the setpoint.

This annunciator procedure will be changed to add the new rod withdraw block setpoint.

PCR 01146750 has been initiated to track changes to C.6-005-A-03 due to EC 10856 PRNM retrofit.9.4 Procedure C.6-005-A-06, Rev 3, APRM Downscale, states a NTSP setpoint of 3.5% RTP. This is correct for the present neutron monitoring system. Even though the PRNM CLTP and EPU operation NTSP setpoints are 3.5 % RTP, the procedure does not address that the PRNM retrofit NTSP setpoints remain the same for APRM Downscale Rod Block. PCR 01146778 was initiated to revise C.6-005-A-03, Rev 1, when EC 10856 PRNM retrofit is installed.

9.5 Procedure

C.6-005-A-22, Rev 3, APRM Hi Hi INOP CH 1, 2, 3, is a flow-bias APRM Neutron Flux Hi Hi setpoint.

PRNM retrofit converts this setpoint to a non-flow bias APRM Neutron Flux High setpoint.

The PRNM APRM Neutron Flux High setpoint is part of this calculation.

C.6-005-A-22 will be revised under EC-1 0856 and PCR 01129100.9.6 Procedure C.6-005-A-30, Rev 3, APRM Hi Hi INOP CH 4, 5, 6, is a flow-bias APRM Neutron Flux Hi Hi setpoint.

PRNM retrofit converts this setpoint to a non-flow bias APRM Neutron Flux High setpoint.

The PRNM APRM Neutron Flux High setpoint is part of this calculation.

C.6-005-A-30 will be revised under EC-1 0856 and PCR 01133816.9.7 Procedure B.05.06-02, Rev 18, Operations Manual Section -Plant Protection System, specifies APRM Hi Hi and APRM Downscale and other setpoints.

This calculation evaluates the APRM Downscale Rod Block setpoints and documents the PRNM EPU changein this setpoint.

The APRM Hi Hi setpoint is flow biased and is PRNM changes this setpoint to non-flow bias APRM Neutron Flux High.B.05.06-02 will be revised under EC-1 0856 and PCR 01133455.

-- ......L-..~..,...........

MONTICELLO NUCLEAR GENERATING PLANT CA-08-050 TITLE: Instrument Setpoint Calculation

-Revision 0 Average Power Range Monitor (APRM) Non-Flow Biased PRNM Setpoints for CLTP and EPU Page 57 of 58 9.8 Procedure B.05.01.02-02, Rev 6, Operations Manual Section -Power Range Neutron Monitoring, specifies NMS trip setpoints, which are being changed due to PRNMS. B.05.01.02-02 will be revised under EC-1 0856 and PCR 01137808.9.9 B.05.01.02-05, Rev 16, Operations Manual Section -Power Range Neutron Monitoring, System Operation.

B.05.01.02-05, Rev 16 refers to the six APRM channels, which applies to the existing NMS. PRNMS has four APRM channels as stated is Section 7.2.2.1 of this calculation.

PCR 01146778 issued to revise B.05.01.02-05, Rev 16, upon implementation of EC 10856.9.10 DBD B5.1, Rev C, Design Bases Document for Neutron Monitoring System, discusses NMS setpoints, margin, uncertainty parameters such as drift, etc. This calculation validated certain NMS setpoints using the PRNM parameter uncertainties specified in GE documentation.

DBD B5.1 will be revised under EC 10856. GAR 1138038 tracks revision to DBD B5.1 for EC 10856 PRNM setpoint changes.9.11 MNGP Technical Specification, Amendment 155, Table 3.3.1.1-1, for APRM Flow Referenced Neutron Flux High High is replaced by PRNM APRM Neutron Flux High. New setpoint PRNM Neutron Flux-High (Setdown) is added. APRM Downscale Rod Block is being removed from Tech Specs when PRNM retrofit is installed.

GAR 01146762 was initiated to track changes to the Technical Specifications due to EC 10856.9.12 MNGP Technical Specifications Bases, Rev 8, Bases will be revised to discuss the PRNM APRM Neutron Flux High setpoint, which is non-flow bias, in place of the existing Flow Referenced Neutron Flux-High High setpoint.

PRNM Neutron Flux-High (Setdown) setpoint to being added. GAR 01146763 has been initiated to track changes to the Technical Specification Bases due to EC 10856.9.13 MNGP Technical Requirements Manual (TRM), Rev 2, New PRNM Setdown Rod Block setpoint is to be discussed in the TRM. The APRM Downscale Rod Block setpoint is being removed from the Tech Specs and will be added to the TRM.APRM Downscale Rod Block setpoint is the same for CLTP and EPU. This-calculation provides the design basis for the EPU APRM Downscale Rod Block NTSP setpoint because the GEH Input documents have a slightly different value.LAR 01128839 has been initiated to track PRNM setpoint changes to the TRM due to EC 10856.

MONTICELLO NUCLEAR GENERATING PLANT CA-08-050 TITLE: Instrument Setpoint Calculation

-Revision 0 Average Power Range Monitor (APRM) Non-Flow Biased PRNM Setpoints for CLTP and EPU Page 58 of 58 9.14 Procedure 8211, Rev 2, APRM Calibration Readjustment forSingle Loop, discusses APRM setpoint voltage adjustments including Downscale Rod Block, Hi-Hi Scram, etc. Changes have been made by PRNM and this calculation evaluates the non-flow biased PRNM setpoints.

Procedure 8211 will be deleted under EC-10856, PCR 01133437.

SLO operation will be enabled under Operations procedure in B.05.01.02-05.

PCR 1133449 has been initiated to track these procedure changes.9.15 Procedure 8212, Rev 2, APRM Calibration Readjustment for Two Loop, discusses APRM setpoint voltage adjustments including Downscale Rod Block, Hi-Hi Scram, etc. Changes have been made by PRNM and this calculation evaluates the non-flow biased PRNM setpoints.

Procedure 8212 will be deleted under EC-1 0856, PCR 01133445.

TLO operation will be enabled under Operations procedure in B.05.01.02-05.

PCR 1133449 has been initiated to track these procedure changes.9.16 Procedure 0012, APRM/Flow Reference Scram Functional Check, performs the calibration of the APRM including the Neutron Flux High Scram, Setdown Scram, Setdown Rod Block, and Downscale Rod Block setpoints.

Setpoints are revised as a result of this calculation.

0012 will be deleted under EC-10856, PCR 01133332.

Procedures ISP-NIP-0588, ISP-NIP-0589-01, ISP-NIP-0589-02 will be developed to replace 0012. APRM Calibration will be created under EC-10856.PCR 01129124 has been initiated to track these procedure changes.

MONTICELLO NUCLEAR GENERATING PLANT Attachment I Setpoint Diagrams CA-08-050 Revision 0 Page 1 of 2 APRM Neutron Flux -High Scram -CLTP and EPU Operation% RTP 125.0 AL LER Avoidance 122.0 AV 121.4 NTSP 2 See Note 1 As Found/As Left Tolerance 120.8 As Found/As Left 119.5 NTSP ALT = AFT + 1.34%118.2 As Found/As Left APRM Neutron Flux (Setdown)

Scram for CLTP and EPU Operation% RTP n/a AL LER Avoidance See Note 1 As Found/As Left Tolerance 20.0 AV 19.4 NTSP 2 19.3 As Found/As Left 18.0 NTSP ALT = AFT +/- 1.34%16.7 As Found/As Left MONTICELLO NUCLEAR GENERATING PLANT CA-08-050 Attachment I Revision 0 Setpoint Diagrams Page 2of 2 APRM Neutron Flux (Setdown)

Rod Block -CLTP and EPU Operation% RTP n/a AL 15.0 AV 14.3 As Found/As Left See Note 1 As Found/As Left Tolerance 13.0 NTSP ALT = AFT +/- 1.34 %11.7 As Found/As Left APRM Downscale Rod Block -CLTP and EPU Operation% RTP See Note 1 As Found/As Left Tolerance LER Avoidance 4.8 As Found/As Left 3.5 NTSP ALT = AFT +/- 1.34 %2.2 As Found/As Left 2.61 NTSP 2 2.0 AV n/a AL Note 1: The As-Left and As-Found uncertainty tolerances are specified as 1.34 %RTP because GEH Inputs 4.2 and 4.3 state tolerance of 2 % RTP, 3cU.Converting AFT/ALT to 2 c confidence level results in 1.34 % RTP.. However, AFT/ALT tolerances are 0.00.% RTP when used for PRNM surveillance calibration.

PRNMS is a digital system and the setpoint.is a single number in the database not susceptible to drift. Sections 7.3.1.3 and 7.3.1.4 evaluate the uncertainty and calibration tolerances for AFT and ALT.