NRC 2009-0110, Response to Request for Additional Information, License Amendment Request 247, Spent Fuel Pool Storage Criticality Control

Response to Request for Additional Information, License Amendment Request 247, Spent Fuel Pool Storage Criticality Control

ML093270080
Person / Time
Site:	Point Beach
Issue date:	11/20/2009
From:	Meyer L Point Beach
To:	Document Control Desk, Office of Nuclear Reactor Regulation
References
NRC 2009-0110
Download: ML093270080 (35)

Text

NEXTera TM ENERGY@

November 20,2009 7 POINT BEACH NRC 2009-0110 10 CFR 50.90 U. S. Nuclear Regulatory Commission ATTN: Document Control Desk Washington, DC 20555-0001 Point Beach Nuclear Plant, Units Iand 2 Dockets 50-266 and 50-301 Renewed License Nos. DPR-24 and DPR-27 Response to Request for Additional lnformation License Amendment Request 247 Spent Fuel Pool Storage Criticality Control References (I) FPL Energy Point Beach Letter to NRC, License Amendment Request Number 247, Spent Fuel Pool Storage Criticality Control, dated July 24,2008 (ML082240685)

(2) FPL Energy Point Beach Letter to NRC, Supplement to License Amendment Request Number 247, Spent Fuel Pool Storage Criticality Control, dated September 19,2008 (ML082630114)

(3) NRC letter to NextEra Energy Point Beach, Point Beach Nuclear Plant, Units Iand 2 - Request for Additional lnformation from Reactor Systems Branch Related to License Amendment Request No. 247 Spent Fuel Pool Storage Criticality Control - Round 3, dated October 22, 2009 (ML092930502)

NextEra Energy Point Beach, LLC (NextEra), (formerly known as FPL Energy Point Beach, LLC),

submitted a proposed license amendment request for Commission review and approval pursuant to 10 CFR 50.90 for Point Beach Nuclear Plant (PBNP), Units 1 and 2 (Reference I ) . The proposed amendment revises the licensing basis to reflect a revision to the spent fuel pool (SFP) criticality analysis methodology. The revised criticality analysis for the SFP storage racks credits burnup, integral fuel burnable absorber (IFBA), Plutonium-241 decay, and soluble boron, where applicable. NextEra provided a supplemental response (Reference 2) containing additional quantitative information to support the fidelity of key methodology aspects described in Reference (1). of this letter provides the NextEra response to the request for additional information in accordance with Reference (3). Enclosure 2 contains an Addendum to WCAP-16541-P, Revision 2, which contains an analysis that restores the full 0.5% Ak analytical margin for the proposed storage configurations, incorporating any identified non-conservatisms. The changes to the proposed Technical Specifications, as a result of the burnup offsets, are contained in .

This letter contains no new commitments and no revisions to existing commitments.

NextEra Energy Point Beach, LLC, 6610 Nuclear Road, Two Rivers, WI 54241

Document Control Desk Page 2 The information contained in this letter does not alter the no significant hazards consideration contained in Reference ( I ) and continues to satisfy the criteria of 10 CFR 51-22for categorical exclusion from the requirements of an environmental assessment.

In accordance with 10 CFR 50.91, a copy of this letter is being provided to the designated Wisconsin Official.

I declare under penalty of perjury that the foregoing and enclosed information is true and correct.

Executed on November 20,2009.

Very truly yours, NextEra Energy Point Beach, LLC Enclosures cc: Administrator, Region Ill, USNRC Project Manager, Point Beach Nuclear Plant, USNRC Resident Inspector, Point Beach Nuclear Plant, USNRC PSCW

ENCLOSURE I NEXTERA ENERGY POINT BEACH, LLC POINT BEACH NUCLEAR PLANT, UNITS I AND 2 LICENSE AMENDMENT REQUEST 247 SPENT FUEL POOL STORAGE CRITICALITY CONTROL RESPONSE TO REQUEST FOR ADDITIONAL INFORMATION The following information is provided by NextEra Energy Point Beach, LLC (NextEra)in response to the NRC staff's request for additional information (RAI) dated October 22,2009, to support continued review of Point Beach Nuclear Plant (PBNP) License Amendment Request 247.

Question I:

Based on the information submitted by the licensee to date, the staff finds that the licensee's analysis does not provide reasonable assurance that Point Beach fuel storage will comply with the regulatory limit of kerfless than I.0 under unborated conditions. Currently, there is not a generically approved methodology for performing an SFP criticality analysis. Therefore, licensees must submit a plant-specific SFP criticality analysis that includes technically-supported margins. lssues identified during staff review to date have reduced the reserved analytical margin, an order of magnitude from 0.5% Ak to 0.049% Ak. The analysis currently shows a maximum keffof 0.99951. The analytical margin is normally reserved to address potential uncertainties that are unaccounted for. The reserved analytical margin of 0.049% Ak essentially requires that there are no other uncertainties that must be accounted for, and that the remaining portions of the analysis are without issues. The staff finds that this is not the case for the Point Beach analysis.

For example, the proper use of the constant specific power and operating history assumption alone requires an additional allowance of 0.2% Ak margin, according to NUREG-6665, "Review and Prioritization of Technical lssues Related to Burnup Credit for L WR Fuel." With the reserved analytical margin at 0.049% Ak, the analysis is unable to accommodate this additional uncertainty, The analysis no longer provides reasonable assurance that keffwill be less than 1.0.

With available margin being so small, issues that may be otherwise resolved by engineering judgment become more important to consider and quantify. Consequently, an issue that was relatively insignificant in the past can now be significant enough to cause regulatory limits to be exceeded, lssues such as the effect of not accounting for fission products and actinides in the criticality code validation, become important to quantify when any additional error greater than or equal to 0.00049 in Ak results in non-compliance. An analysis that retains the full 0.5 percent Ak analytical margin intact may allow the staff to accept engineeringjudgment to disposition certain issues.

"In summary, the staff finds that the current Point Beach analysis does not provide the staff with reasonable assurance that Point Beach fuel storage will comply with the regulatory limit of keff Page 1 of 2

less than 1.0 under unborated conditions. For the staff to continue its review, the licensee should consider resubmitting an analysis that restores the full 0.5% Ak analytical margin for the proposed storage configurations, incorporating any identified non-conservatisms. Alternatively, the licensee may attempt to regain the analytical margin by identifying and quantifying the conservatisms in their analysis. However, this approach usually results in a more lengthy review with additional RA1s to substantiate the identified conservatisms."

NextEra Response Burnup offsets to restore the full administrative margin have been calculated. The burnup offsets result in increased burnup requirements for the three proposed storage configurations.

The details on how the burnups were calculated and results are contained in Enclosure 2. The changes to the proposed technical specifications, as a result of the burnup offsets, are contained in Enclosure 3.

Page 2 of 2

ENCLOSURE 2 NEXTERA ENERGY POINT BEACH, LLC POINT BEACH NUCLEAR PLANT, UNITS I AND 2 LICENSE AMENDMENT REQUEST 247 SPENT FUEL POOL STORAGE CRITICALITY CONTROL ADDENDUM TO WCAP-16541 REVISION 2 POINT BEACH UNITS I AND 2 SPENT FUEL POOL CRITICALITY SAFETY ANALYSIS 26 pages follow

Westinghouse Non-Proprietary Class 3 WCAP-16541-NP Revision 2, Addendum 1 Point Beach Units 1 and 2 Spent Fuel Pool Criticality Safety Analysis - Addendum A. J. Blanco*

J. B. Clarity*

November 2009 Reviewer: T. C. Bishop*

Approved: E. J. Mercier*, Manager U.S. BWR Reload Analysis and Criticality Safety

• Electronically approved records are authenticated in the electronic document management system.

Westinghouse Electric Company LLC P.O. Box 355 Pittsburgh, PA 15230-0355 O 2009 Westinghouse Electric Company LLC All Rights Reserved

Westinghouse Non-Proprietary Class 3 WCAP.16541.NP. Revision 2. Addendum 1 TABLE O F CONTENTS Introduction ................................................................................................................................1 Methodology ................................................................................................................................... 3 2.1 Backcground .......................................................................................................................3 2.2 Burnup Offset Generation .............................................................................................3 2.3 Burnup Offset Impact on Biases and Uncertainties .....................................................3 Analysis .....................................................................................................................................5 3.1 Burnup Limits ................................................................................................................. 5 3.1.1 "All-Cell" Configuration ................................................................................. 5 3.1.2 "1-out-of-4 5.0 wlo Fresh. No IFBA" Configuration ........................................ 5 3.1.3 "1-out-of-4 4.0 wlo Fresh. With IFBA" Configuration ..................................... 6 Results .........................................................................................................................................11 4.1 Burnup vs.Enrichment Curves ................................................................................... 11 References .....................................................................................................................................19

Westinghouse Non-Prourietarv Class 3 WCAP-16541-NP. Revision 2. Addendum 1 This page intentionally left blank.

Westinghouse Non-Proprietary Class 3 WCAP.16541.NP. Revision 2. Addendum 1 LIST OF TABLES Table 1-1WCAP.16541.NP. Revision 2. Section 4.0 Tables ....................................................................

2 Table 1-2 WCAP.16541.NP. Revision 2. Section 4.0 Figures ..................................................................2 Table 2-1 Total Credited Administrative Margin .....................................................................................4 Table 3-1 WCAP.16541.NP, Revision 2 Data Source Tables ................................................................. 7 Table 3-2 "All-Cell" Configuration Burnup Offsets (MWdIMTU) and Associated Increase in Administrative Margin (Ak) .............................................................................................

8 Table 3-3 "l-out-of-4 5.0 w/o Fresh. No IFBA" Configuration Burnup Offsets (MWdIMTU) and Associated Increase in Administrative Margin (Ak) ......................................................9 Table 3-4 "1-out-of-4 4.0 wlo Fresh. With IFBA" Configuration Burnup Offsets (MWdIMTU) and Associated Increase in Administrative Margin (Ak) ....................................................10 Table 4-1 WCAP.16541.NP. Revision 2. Section 4.0 Tables .................................................................. 12 Table 4-2 WCAP.16541.NP, Revision 2. Section 4.0 Figures ................................................................ 12 Table 4-3 Fuel Assembly Burnup versus Initial Enrichment for the "All-Cell" Storage Configuration ..................................................................................................................

13 Table 4-4 Fuel Assembly Burnup versus Initial Enrichment for the "1-out-of-4 5.0 w/o Fresh. No I IFBA" Storage Configuration ........................................................................................

14 Table 4-5 Fuel Assembly Burnup versus Initial Enrichment for the "l-out-of-4 4.0 w/o Fresh. With IFBA" Storage Configuration ........................................................................................

15

Westinghouse Non-Proprietary Class 3 WCAP-16541-NP, Revision 2, Addendum 1 This page intentionally left blank.

Westinehouse Non-Proorietarv Class 3 WCAP-16541-NP, Revision 2, Addendum 1 LIST OF FIGURES Figure 4-1 Fuel Assembly Burnup versus Initial Enrichment for the "All-Cell" Storage Configuration .................................................................................................................16 Figure 4-2 Fuel Assembly Burnup versus Initial Enrichment for the "1-out-of-4 5.0 w/o Fresh, No IFBA" Storage Configuration ...................................................................................... 17 Figure 4-3 Fuel Assembly Burnup versus Initial Enrichment for the "1-out-of-44.0 w/o Fresh, With IFBA" Storage Configuration ........................................................................................18

Westinghouse Non-Proprietary Class 3 WCAP-16541-NP, Revision 2, Addendum 1

1.0 INTRODUCTION

This addendum documents revisions to the burnup vs. initial enrichment limit curves found in WCAP-16541-NP, Revision 2 (Reference 2) to incoi-porate burnup offsets. The report contains the methodology followed in generating the burnup offsets, burnup vs. initial enrichment limit curves, and bu~rnupvs. initial enrichment polynomials for each configuration found in WCAP-16541-NP, Revision 2. The new burnup vs. initial enrichment limits restore the 0.005 Ak of administrative margin to satisfy the request for additional information in Reference 1.

Tables 1-1 and 1-2 summarize which tables and figures in Section 4.0 of the original issuance of WCAP-16541-NP have been updated.

Westinghouse Non-Pro~rietarvClass 3 WCAP-16541-NP. Revision 2, Addendum 1 Table 1-1 WCAP-16541-NP, Revision 2, Section 4.0 Tables WCAP Table Updated Addendum Table 4-1 Yes 4-3 4-2 Yes 4-4 4-3 Yes 4-5 4-4 NO N/A 4-5 NO N/A Table 1-2 WCAP-16541-NP, Revision 2, Section 4.0 Figures WCAP Figure Updated Addendum Figure 1 4- 1 4-2 4-6 4-7 NO NO Yes N/A N/A N/A N/A 4- 1 4-8 Yes 4-2 4-9 Yes 4-3 4-10 NO N/A

Westinghouse Non-Proprietary Class 3 WCAP-16541-NP, Revision 2, Addendum 1 2.0 Methodology 2.1 Background WCAP-16541-NP, Revision 2, contains 0.005 Ak of administrative lnargin reserved from both the borated and unborated keffregulatoly requirements of 0.95 and 1.0 respectively. A portion of the reserved administrative margin was used in response to requests for additional information (References 3, 5, and 7). Table 2-1 lists the total credited administrative margin.

2.2 Burnup Offset Generation Bu~nupoffsets are generated for each configuration, enrichment, and decay time combination to restore the administrative margin to a minimum of 0.005 Alc.

The lnaximurn allowable fresh fuel enrichment for each configuration remains unaffected because administrative lnargin was credited only for situations related to depleted fuel.

The burnup offsets given in Section 3.0 are created by quadratically fitting kffvs. burnup for each emichment/decay time combination for each configuration. The keEvalues as a function of burnup, emichment, and decay time come from Tables 3-7, 3-11, and 3-13 of WCAP-16541-NP, Revision 2. The fitted equation coupling bRand burnup is then used to determine the bumup offset needed to restore a minimuln of 0.005 Alc admhistrative margin.

0 2.3 Burnup Offset Impact on Biases and Uncertainties The burnup offsets do not impact the biases and uncertainties documented in WCAP-16541-NP, Revision 2.

The majority of uncertainty calculations were performed using fresh fuel and therefore are not impacted by the burnup offset. The sum of biases and uncertainties used in the WCAP-16541-NP, Revision 2 analysis is bounding (Reference 6, Question 2). The analysis in WCAP-16541-NP, Revision 2 incorporates limiting biases and uncertainties from fresh and depleted conditions, to maximize the sum of biases and uncertainties.

The temperature bias calculation was performed using depleted fuel. The temperature bias was taken as the maximum value calculated based on a variety of enrichment and bumup combinations for each configuration and therefore the most limiting value was included in each configuration (Reference 4, Question 3). The temperature bias is thus not affected by the bumup offset.

The burnup uncertainty in WCAP-16541-NP, Revision 2 is 5% of the burnup limit lnultiplied by the change in reactivity per change in burnup. In response to Question 1, documented in Reference 4, the burnup uncertainty was recalculated as described in Reference 8. The reactivity difference between the two methods was credited against the available administrative margin. To regain the full 0.005 Ak of administrative margin, the reactivity credit talcen from the administrative margin is being translated into a burnup offset. This b m u p offset does not impact the biases and uncertainties, as discussed above.

Westinghouse Non-Proprietary Class 3 WCAP-16541-NP, Revision 2, Addendum 1 Table 2-1 Total Credited Administrative Margin Credited Administrative Margin (Ak)

"All-Cell" 0.00131 ccl-out-of-4,5.0w/o Fresh, No IFBA" 0.0045 1 ccl-out-of-4,4.0w/o Fresh, With IFBA" 0.00421

Westinghouse Non-Proprietary Class 3 WCAP-16541-NP, Revision 2, Addendum 1 3.0 Analysis 3.1 Burnup Limits The three configurations analyzed in WCAP-16541-NP, Revision 2 are an "All-Cell" configuration and two "1-out-of-4" configurations. The "All-Cell" configuration stores assemblies that have similar reactivity, where a "l-out-of-4" configuration stores one high reactivity assembly for eveiy three low reactivity assemblies. The first of the two "l-out-of-4" configurations is the "l-out-of-4 5.0 w/o Fresh, No IFBA" configuration. This configuration assumes the high reactivity assembly is a 5.0 w/o fi-esh assembly without IFBA. The second of the two "l-out-of-4" configurations is the "l-out-of-4 4.0 w/o Fresh, With IFBA" configuration. This configuration assumes the high reactivity assembly is a 4.0 w/o fi-esh assembly with no IFBA or a greater than 4.0 w/o fresh assembly containing IFBA.

For each of these configurations WCAP- 16541-NP,Revision 2 reports &K values for several b m u p and decay time combinations for initial enrichments of 3.0, 4.0, and 5.0 wlo. The 1~~vs. burnup and burnup limit tables froin WCAP-16541-NP, Revision 2 are presented in Table 3-1.

The fonnulation of the fitting coefficients and burnup offsets is given below for each configuration.

3.1.1 "All-Cell" Configuration Quadratic fits of the data fi-om Table 3-7 of WCAP-16541-NP, Revision 2 were used to develop fitting

( coefficients as discussed in Section 2.2. The fitting coefficients were used in conjunction with the original bumup limits to detennine the nominal multiplication factor of the required burnup for each enrichmentldecay time. The burnup offset was then detennined so that the AlkRbetween the new burnup limit and original burnup limit was greater than that shown in Table 2-1. The resulting set of burnup offsets and associated inargin reclaimed are shown in Table 3-2.

The minimum administrative margin gain for the "All-Cell" configuration, shown in Table 3-2, is 0.00138 Ak.

From Table 2-1, the additional inargin needed to return the administrative margin to 0.005 Ak is 0.00131 Ak.

The burnup offsets shown in Table 3-2 will return all initial eruichmentldecay time combinations in the "All-Cell" configuration to greater than 0.005 Ale administrative margin. Table 4-3 and Figure 4-1 present the updated burnup limits for the "All-Cell" configuration.

3.1.2 "1-out-of-4 5.0 w/o Fresh, No IFBA" Configuration The same method used to detennine the bumup offsets for the "All-Cell" storage configuration was used for the "l-out-of-4 5.0 w/o Fresh, No IFBA" configuration. The resulting set of burnup offsets and associated margin reclaimed are shown in Table 3-3.

The minimurn administrative margin gain for the "1-out-of-4 5.0 w/o Fresh, No IFBA" configuration, shown in Table 3-3, is 0.00453 Ale. From Table 2-1, the additional margin needed to return the administrative inargin to 0.005 Ale is 0.00451 Ale. The burnup offsets shown in Table 3-3 will retun all initial enrichmentldecay time combinations in the "l-out-of-4 5.0 w/o Fresh, No IFBA" configuration to greater than 0.005 Ak administrative margin. Table 4-4 and Figure 4-2 present the updated burnup liinits for the "l-out-of-4 5.0 wlo Fresh, No IFBA" I configuration.

Westinghouse Non-Proprietary Class 3 WCAP-16541-NP, Revision 2, Addendum 1 3.1.3 "1-out-of-4 4.0 wlo Fresh, With IFBA" Configuration The same method used to determine the burnup offsets for the "All-Cell" storage configuration was used for the "1-out-of-4 4.0 wlo Fresh, With IFBA" configuration. The resulting set of burnup offsets and associated margin reclaimed are shown in Table 3-4.

The minimuin administrative margin gain for the "1-out-of-4 4.0 wlo Fresh, With IFBA" configuration, shown in Table 3-4, is 0.00424 Alc. From Table 2-1, the additional margin needed to return the administrative margin to 0.005 Alc is 0.00421 Alc. The burnup offsets shown in Table 3-4 will return all initial enrichmentldecay time combinations in the "1-out-of-4 4.0 wlo Fresh, With IFBA" configuration to greater than 0.005 hk administrative margin. Table 4-5 and Figure 4-3 present the updated burnup limits for the "1-out-of-4 4.0 wlo Fresh, With LFBA" configuration.

Westinghouse Non-Pro~rietarvClass 3 WCAP-16541-NP,Revision 2, Addendum 1 Table 3-1 WCAP-16541-NP, Revision 2 Data Source Tables Configuration keEvs. Burnup Tables Burnup Limit Tables

"~11-cell"' 3-7 4- 1 "1-out-of-4,5.0 wlo Fresh, No IFBA" 3-11 4-2 "1-out-of-4,4.0 wlo Fresh, With IFBA" 3-13 4-3

' Note that the "All-Cell"configuration was analyzed based on the assumption of having no fuel pins in guide tubes. The requirements outlined in Section 4.1 .I .Iremain in place.

7 of 19

Westinghouse Non-Proprietary Class 3 WCAP-16541-NP, Revision 2, Addendum 1 Table 3-2 "All-Cell" Configuration Burnup Offsets (MWdMTU) and Associated Increase in Administrative Margin (Ak) 0 yr decay 5 yr decay 10 yr decay 15 yr decay 20 yr decay Enrich. Offset Margin Offset Margin Offset Margin Offset Margin Offset Margin 3.0 200 0.00168 150 0.00138 150 0.00144 150 0.00152 150 0.00157 4.0 200 0.00141 200 0.00152 200 0.00157 200 0.00160 200 0.00165 5.0 250 0.00143 250 0.00152 250 0.00159 250 0.00166 200 0.00139

Westinghouse Non-Proprietary Class 3 WCAP-16541-NP, Revision 2, Addendum 1 Table 3-3 c'1-out-of-45.0 w/o Fresh, No IFBA" Configuration Burnup Offsets (MWdIMTU) and Associated Increase in Administrative Margin (Ak) 0 yr decay 5 yr decay 10 yr decay 15 yr decay 20 yr decay Enrich. Offset Margin Offset Margin Offset Margin Offset Margin Offset Margin 3.O 2000 0.00464 1800 0.00473 1600 0.00464 1500 0.00465 1450 0.00462 4.0 2150 0.00461 1950 0.00469 1800 0.00457 1700 0.00454 1650 0.00465 5.0 2300 0.00461 2100 0.00462 2000 0.00457 1900 0.00453 1800 0.00453

Westin~houseNon-Pro~rietarvClass 3 WCAP-16541-NP, Revision 2, Addendum 1 Table 3-4 "1-out-of-4 4.0 w/o Fresh, With IFBA" Configuration Burnup Offsets (MWdIMTU) and Associated Increase in Administrative Margin (Ak) 0 yr decay 5 yr decay 10 yr decay 15 yr decay 20 yr decay Enrich. Offset Margin Offset Margin Offset Margin Offset Margin Offset Margin 3.0 1300 0.00435 1150 0.00430 1100 0.00446 1000 0.00445 1000 0.00434 4.0 1450 0.00433 1250 0.00430 1200 0.00430 1100 0.00424 1150 0.00435 5.0 1550 0.00434 1450 0.00429 1400 0.00436 1350 0.00432 1300 0.00430

Westinghouse Non-Proprietary Class 3 WCAP-16541-NP, Revision 2, Addendum 1 4.0 Results 4.1 Burnup vs. Enrichment Curves This addendwn to WCAP-16541-NP, Revision 2 contains tables and figures which supersede the original issuance of WCAP-16541-NP, Revision 2. Section 1.0 gives a listing of all tables (Table 1-1) and figures (Table 1-2) from Section 4.0 of the original issuance of WCAP-16541-NP, Revision 2 and indicates whether the table or figure is superseded by this addendum and the identifier (i.e. Table 4-2) of the new table or figure which supersedes that in WCAP-16541-NP, Revision 2. Tables 1-1 and 1-2 have been repeated here as Tables 4-1 and 4-2.

Westinghouse Non-Proprietary Class 3 WCAP-16541-NP, Revision 2, Addendum 1 Table 4-1 WCAP-16541-NP, Revision 2, Section 4.0 Tables WCAP Table Updated Addendum Table 4- 1 Yes 4-3 4-2 Yes 4-4 4-3 Yes 4-5 4-4 No N/A 4-5 NO N/A Table 4-2 WCAP-16541-NP, Revision 2, Section 4.0 Figures WCAP Figure Updated Addendum Figure 4- 1 NO N/A 4-2 NO N/A 4-3 NO N/A 4-4 NO N/A 4-5 NO N/A 4-6 NO N/A 4-7 Yes 4- 1 4-8 Yes 4-2 4-9 Yes 4-3 4-10 NO N/A

Westinghouse Non-Pro~rietarvClass 3 WCAP-16541-NP, Revision 2, Addendum 1 Table 4-3 Fuel Assembly Burnup versus Initial Enrichment for the "All-Cell" Storage Configuration Initial Limiting Burnup (MWdMTU)

Enrichment 5 Yr 10 yr 15 yr 20 yr 0 yr

( ~ 1 20 3 S ~ ) decayz decay2 decay2 decay2 decay2 2.13 0 0 0 0 0 3 .O 9135 8643 8480 8201 8116 4.0 18675 17850 17372 16989 16754 5.0 27599 26215 25256 24605 24000 Note that the assembly btunups as a function of initial enrichment for each decay period are described by the following polynomials:

Assembly Burnup (0 yr decay) - 71.56e3 - 1166.69e2 + 15059.19e - 27474.43 Assembly Burnup (5 yr decay) - -ll.14e3 - 287.32e2 + 11630.42e - 23361.60 Assembly Burnup (10 yr decay) = -16.28e3 - 308.68e2 + 11655.01e - 23267.42 Assembly Btunup (15 yr decay) = -85.22e3 + 436.68e2 + 8884.52e - 20081.62 Assembly B m u p (20 yr decay) = -1 13.81e3 + 669.67e2 + 8161.13e - 19321.65 Decay time is defined as the number of years since the fuel assembly was last critical 13 of 19

Westinghouse Non-Proprietary Class 3 WCAP-16541-NP, Revision 2, Addendum 1 Table 4-4 Fuel Assembly Burnup versus Initial Enrichment for the "1-out-of-4 5.0 wlo Fresh, No IFBA" Storage Configuration Initial Lirniting Bu-nup (MWd/MTU)

Eni-ichrnent 5 Yr 10 yr 15 yr 20 yr 0 Yr

( ~ 1 20 3 5 ~ ) decay3 decay3 decay3 decay3 decay3 1.33 0 0 0 0 0 3.O 30193 27661 26113 25092 24131 4.0 42441 39403 37261 36016 34790 5.0 53469 50137 47589 46226 45005 Note that the assembly bumups as a function of initial enrichment for each decay period are described by the following polynomials:

Assembly Bumup (0 yr decay) = 428.92e3 - 5757.04e2 + 36677.22e - 39606.18 Assembly Bumup (5 yr decay) = 354.71e3 - 4760.55e2 + 31941.49e - 34895.75 Assembly Bcunup (10 yr decay) = 346.35e3 - 4566.17e2 + 30296.34e - 33031.86 Asselnbly Bumup (15 yr decay) = 321.26e3 - 4212.08e2 + 28522.05e - 31239.39 Assembly Bumup (20 yr decay) = 326.36e3 - 4138.3 1e2 + 27551.88e - 30091.55 I

Decay time is defined as the number of years since the fuel assembly was last critical

Westinghouse Non-Proprietary Class 3 WCAP-16541-NP, Revision 2, Addendum 1 Table 4-5 Fuel Assembly Burnup versus Initial Enrichment for the "1-out-of-4 4.0 w/o Fresh, With IFBA" Storage Configuration Initial Limiting Burnup (MWcUMTU)

Emichnent 10 yr 15 yr 20 yr 0 Yr 5 Yr (W/O2 3 5 ~ ) decay4 decay4 decay4 decay4 decay4 1.60 0 0 0 0 0 3.0 21183 19794 18695 17901 17783 4.0 32793 30158 29062 27859 27471 5.0 42911 40512 38917 37611 36593 Note that the assembly burnups as a function of initial enrichment for each decay period are described by the following polynomials:

Assembly Burnup (0 yr decay) = 212.05e3 - 3290.58e2 + 26798.27e - 35321.90 Assembly Bumup (5 yr decay) = 461.10e3 - 5538.19e2 + 32070.67e - 39023.97 Assembly Burnup (10 yr decay) = 290.71e3 - 3744.49e2 + 25822.24e - 32920.44 Assembly Burnup (15 yr decay) = 316.33e3 - 3898.92e2 + 25546.37e - 32188.62 Assembly Burnup (20 yr decay) = 286.15e3 - 3716.74e2 + 25117.81e - 31845.90 Decay time is defined as the number of years since the fuel assembly was last critical 15 of 19

Westin~thouseNon-Prourietarv Class 3 WCAP-16541-NP, Revision 2, Addendum 1 Figure

Westinghouse Non-Pro~rietarvClass 3 WCAP-16541-NP. Revision 2, Addendum 1 0 yr decay 5 yr decay 10 yr decay 15 yr decay 2 0 yr decay Figure 4-2 Fuel Assembly Burnup versus Initial Enrichment for the "1-out-of-4 5.0 wlo Fresh, No IFBA" Storage Configuration

Westinghouse Non-Pro~rietarvClass 3 WCAP-16541-NP,Revision 2,Addendum 1 0 yr decay 5 yr decay 10 yr decay 15 yr decay 20 yr decay 1.5 2.0 2.5 3.0 3.5 4.0 4.5 5.C Initial '"u Enrichment (nominal wlo)

Figure 4-3 Fuel Assembly Burnup versus Initial Enrichment for the "1-out-of-4 4.0 w/o Fresh, With IFBA" Storage Configuration I '

Westinghouse Non-Proprietary Class 3 WCAP-16541-NP, Revision 2, Addendum 1

/

5.0 References

1. Poole, J.C. (NRC), "Point Beach Nuclear Plant, Units 1 and 2 - Request for Additional Information from Reactor Systmes [sic] Branch Related to License Amendment Request No.

247 Spent Fuel Pool Storage Criticality Control - Round 3 (TAC NOS. MD9321 AND MD9322)", ML092930502, October 22,2009.

2. Anness, M.G., et al, "Point Beach Units 1 and 2 Spent Fuel Pool Criticality Safety Analysis",

WCAP-16541-NP, Rev. 2, June 2008.

3. Cushing, J. (NRC), "Acceptance Review for License Amendment Request Number 247 Spent Fuel Pool Criticality Control-Supplemental Information Required (TAC NOS.

MD9321 AND MD9322)", ML082530171, September 10,2008.

4. Meyer, L., "Supplement to License Amendment Request Number 247 Spent Fuel Pool Storage Criticality Control" ML082630114, September 19,2008

5. Poole, J.C. (NRC), "Point Beach Nuclear Plant, Units 1 and 2 - Request for Additional Information from Reactor Systems Branch Related to License Amendment Request No. 247 Spent Fuel Pool Storage Criticality Control (TAC NOS. MD9321 AND MD9322),

ML090900617, April 22,2009 i '

6. Meyer, L., "Response to Request for Additional Information License Amendment Request 247 Spent Fuel Pool Storage Criticality Control", ML091420436, May 22,2009.

7. Poole, J.C. (NRC), "Point Beach Nuclear Plant, Units 1 and 2 - Request for Additional Information from Reactor Systems Branch Related to License Amendment Request No. 247 Spent Fuel Pool Storage Criticality Control - Round 2 (TAC NOS. MD9321 AND MD9322)", ML091770550, July 09,2009.

8. Kopp, L. (NRC), "Guidance on the Regulatory Requirements for Criticality Analysis of Fuel Storage at Light-Water Reactor Power Plants", August 19, 1998.

ENCLOSURE 3 NEXTERA ENERGY POINT BEACH, LLC POINT BEACH NUCLEAR PLANT, UNITS 1 AND 2 LICENSE AMENDMENT REQUEST 247 SPENT FUEL POOL STORAGE CRITICALITY CONTROL PROPOSED TECHNICAL SPECIFICATION CHANGES 3 pages follow

Spent Fuel Pool Storage 3.7.1 2 30,000

] 0 yr decay 5 yr decay 10 yr decay 15 yr decay

20 yr decay 0

2.0 2.5 3.0 3.5 4.0 4.5 5.0 Nominal Initial U-235 Enrichment (wlo) 0 yr decay = 71.56e3 - 1166.69e2 + 15059.19e - 27474.43 5 yr decay = -11.14e3 - 287.32e2 + 11630.42e - 23361.60 10 yr decay= -16.28e3 - 308.68e2 + 11655.01e - 23267.42 15 yr decay= -85.22e3 + 436.68e2 + 8884.52e - 20081.62 20 yr decay= -113.81e3 + 669.67e2 + 8161.13e - 19321.65 Figure 3.7.12-1 i 1 Fuel Assembly Burnup Requirement of "All-Cell" Storage Configuration Point Beach Unit 1 - Amendment No.

Unit 2 - Amendment No.

Design Features 4.0 4.0 DESIGN FEATURES 0 yr decay 5 yr decay 10 yr decay 15 yr decay 20 yr decay 1.O 1.5 2.0 2.5 3.0 3.5 4.0 4.5 5.0 Nominal Initial U-235 Enrichment (wlo) 0 y r decay = 428.92e3 - 5757.04e2 + 36677.22e - 39606.18 5 y r decay = 354.71e3 - 4760.55e2 + 31941.49e - 34895.75 10 y r decay= 346.35e3 - 4566.17e2 + 30296.34e - 33031.86 15 y r decay= 321.26e3 - 4212.08e2 + 28522.05e - 31239.39 20 y r decay= 326.36e3 - 4138.31e2 + 27551.88e - 30091.55

/ I Figure 4.3.1-6 Spent Fuel Assembly Burnup Requirements for I-Out-of-4 for 5.0 wlo with no IFBA Point Beach Unit 1 - Amendment No.

Unit 2 - Amendment No.

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