ML22245A106

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Attachment 2: Proposed Certificate of Compliance No. 1014, Appendix a, Technical Specifications for the HI-Storm 100 Cask System
ML22245A106
Person / Time
Site: Holtec
Issue date: 09/02/2022
From:
Holtec
To:
Office of Nuclear Material Safety and Safeguards
Shared Package
ML22245A103 List:
References
5014950
Download: ML22245A106 (12)
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Text

PROPOSED CERTIFICATE OF COMPLIANCE NO. 1014 APPENDIX A TECHNICAL SPECIFICATIONS FOR THE HI-STORM 100 CASK SYSTEM to Holtec Letter 5014950 1 of 12

SFSC Heat Removal System 3.1.2 Certificate of Compliance No. 1014 Amendment No. 18 Appendix A 3.1.2-2 SURVEILLANCE REQUIREMENTS SURVEILLANCE FREQUENCY SR 3.1.2 Verify all OVERPACK inlets and outlets are free of blockage from solid debris or floodwater.

Table 3-5 OR For OVERPACKS with installed temperature monitoring equipment, verify that the difference between the average OVERPACK air outlet temperature and ISFSI ambient temperature is

< 155oF for OVERPACKS containing PWR MPCs, < 137oF for OVERPACKS containing BWR MPCs (except MPC-68M) and 164°F for OVERPACKS containing MPC-68M. For sites that have loaded in accordance with the Topical Report HI-2200343-A, verify that the difference between the average OVERPACK air outlet temperature and ISFSI ambient temperature is less than or equal to the value computed using the topical report methodology.

Table 3-5 to Holtec Letter 5014950 2 of 12

MPC Helium Backfill Limits Table 3-2 Certificate of Compliance No. 1014 Amendment No. 18 Appendix A 3.3.1-3 Table 3-1a MPC Cavity Drying Limits for all MPC Types for VENTILATED OVERPACK Note 9 Fuel Burnup (MWD/MTU)

MPC Heat Load (kW)

Method of Moisture Removal (Notes 1, 2 and 3)

All Assemblies < 45,000 26 (MPC-24/24E/24EF, MPC-32/32F, MPC-68/68F/68FF)

VDSNote 5 or FHDNote 6 36.9 (MPC-68M)Note 6 VDS or FHD 42.8 (MPC-68M)Note 7 VDS or FHD All Assemblies < 45,000 36.9 (MPC-24/24E/24EF, MPC-32/32F, MPC-68/68F/68FF)Note 6 VDSNote 8 or FHD One or more assemblies

> 45,000 29 (MPC-68M)

VDSNote 4 One or more assemblies

> 45,000 36.9 (MPC-24/24E/24EF/MPC-32/32F/MPC-68/68F/68FF)Note6 VDSNote8 or FHD 36.9 (MPC-68M)Note6 VDSNote8 or FHD 42.8 (MPC-68M)Note 7 VDSNote8 or FHD Notes:

1. VDS means a vacuum drying system. The acceptance criterion when using a VDS is MPC cavity pressure shall be < 3 torr for > 30 minutes.
2. FHD means a forced helium dehydration system. The acceptance criterion when using an FHD system is the gas temperature exiting the demoisturizer shall be

< 21oF for > 30 minutes or the gas dew point exiting the MPC shall be < 22.9oF for > 30 minutes.

3. Vacuum drying of the system must be performed with the annular gap between the MPC and the TRANSFER CASK filled with water.
4. The maximum allowable decay heat per fuel storage location is 0.426 kW.
5.

Maximum allowable storage cell heat load is 1.083 kW (MPC-24/24E/24EF), 0.812 kW (MPC-32/32F) and 0.382 kW (MPC-68/68F/68FF).

6.

Maximum per assembly allowable heat loads under uniform or regionalized storage defined in Appendix B, Section 2.4.1 or 2.4.2.

7.

Maximum per assembly allowable heat loads defined in Appendix B Figures 2.4-1 through 2.4-4. to Holtec Letter 5014950 3 of 12

MPC Helium Backfill Limits Table 3-2 Certificate of Compliance No. 1014 Amendment No. 18 Appendix A 3.3.1-4

8.

Vacuum drying of the MPC must be performed using cycles of the drying system, according to the guidance contained in ISG-11 Revision 3. The time limit for these cycles shall be determined based on site specific conditions. Applies when any one assembly heat load is greater than 0.426 kW.

9.

Alternative heat load limits may be developed following the methodology in Topical Report HI-2200343-A, Revision 2. These patterns must have a total MPC heat load less than or equal to 50 kW. Dryness criteria are still as specified in Notes 1 or 2 as applicable to the selected drying process, and Note 3 still applies to vacuum drying.

to Holtec Letter 5014950 4 of 12

MPC Helium Backfill Limits Table 3-2 Certificate of Compliance No. 1014 Amendment No. 18 Appendix A 3.3.1-6 Table 3-2a MPC Helium Backfill Limits for VENTILATED OVERPACKNote 1,2 MPC MODEL LIMIT MPC-24/24E/24EF

i. Cask Heat Load 27.77 kW (MPC-24) or 28.17 kW (MPC-24E/EF) -

uniformly distributed per Table 3-4 or regionalized loading per Table 3-3 0.1212 +/-10% g-moles/l OR 29.3 psig and 48.5 psig ii. Cask Heat Load >27.77 kW (MPC-24) or > 28.17 kW (MPC-24E/EF) -

uniformly distributed or greater than regionalized heat load limits per Table 3-3 45.5 psig and 48.5 psig MPC-68/68F/68FF

i. Cask Heat Load 28.19 kW -

uniformly distributed per Table 3-4 or regionalized loading per Table 3-3 0.1218 +/-10% g-moles/l OR 29.3 psig and 48.5 psig ii. Cask Heat Load > 28.19 kW -

uniformly distributed or greater than regionalized heat load limits per Table 3-3 45.5 psig and 48.5 psig MPC-32/32F

i. Cask Heat Load 28.74 kW -

uniformly distributed per Table 3-4 or regionalized loading per Table 3-3 29.3 psig and 48.5 psig ii. Cask Heat Load >28.74 kW -

uniformly distributed or greater than regionalized heat load limits per Table 3-3 45.5 psig and 48.5 psig MPC-68M

i. Cask Heat Load 28.19 kW -

uniformly distributed per Table 3-4 0.1218 +/-10% g-moles/l to Holtec Letter 5014950 5 of 12

MPC Helium Backfill Limits Table 3-2 Certificate of Compliance No. 1014 Amendment No. 18 Appendix A 3.3.1-7 or regionalized loading per Table 3-3 OR 29.3 psig and 48.5 psig ii. Cask Heat Load > 28.19 kW -

uniformly distributed or greater than regionalized heat load limits per Table 3-3 45.5 psig and 48.5 psig iii.

Cask Heat Load 42.8 kW QSHL Loading Pattern shown in Appendix B, Figure 2.4-1 QSHL patterns shown in Appendix B, Figures 2.4-2 through2.4-4 43.5 psig and 46.5 psig 45.5 psig and 48.5 psig Notes

1. Helium used for backfill of MPC shall have a purity of 99.995%. Pressure range is at a reference temperature of 70oF
2. For heat load patterns developed in accordance with Table 3-1, Note 9, helium backfill limits shall be calculated in accordance with Topical Report HI-2200343-A Revision 2 to Holtec Letter 5014950 6 of 12

MPC Heat Load Limits Table 3-3 Certificate of Compliance No. 1014 Amendment No. 18 Appendix A 3.3.1-9 Table 3-3: Regionalized StorageNote 2 Cell Heat Load Limits MPC Type Number of Cells in Inner RegionNote 1 Storage Cell Heat Load (Inner Region)

(kW)

Number of Cells in Outer RegionNote 1 Storage Cell Heat Load (Outer Region)

(kW)

MPC-24 4

1.470 20 0.900 MPC-24E/EF 4

1.540 20 0.900 MPC-32/32F 12 1.131 20 0.600 MPC-68/68F/68FF/68M 32 0.500 36 0.275 Note 1: The location of MPC-32 and MPC-68 inner and outer region cells are defined in Appendix B Figures 2.1-3 and 2.1-4 respectively.

The MPC-24 and MPC-24E/EF cell locations are defined below:

Inner Region Cell numbers 9, 10, 15, 16 in Appendix B Figures 2.1-1 and 2.1-2 respectively.

Outer Region Cell numbers 1-8, 11-14, 17-24 in Appendix B Figures 2.1-1 and 2.1-2 respectively.

Note 2: The storage cell regionalization is defined in Note 1 in accordance with safety analyses under the heat load limits of this Table. For heat load patterns developed in accordance with Table 3-1a, Note 9, these limits do not apply.

Table 3-4: Uniform Storage Cell Heat Load Limits MPC Type Heat Load (kW)

MPC-24 1.157 MPC-24E/EF 1.173 MPC-68/68F/68FF/68M 0.414 MPC-32 0.898 Note: For heat load patterns developed in accordance with Table 3-1a, Note 9, these limits do not apply.

to Holtec Letter 5014950 7 of 12

LCO Completion Time Table 3-5 Certificate of Compliance No. 1014 Amendment No. 18 Appendix A 3.3.1-10 Table 3-5: Completion Time for Actions to Restore SFSC Heat Removal System OperableNote 2 MPC Material MPC Type Decay Heat Limits per Storage Location Condition B Completion Time Condition C Completion Time Surveillance Frequency Alloy X Except Duplex1 MPC-24/24E/24EF Appendix B, Section 2.4 8 hrs 24 hrs 24 hrs MPC-32/32F MPC-68/68F/68FF/68M MPC-68M Appendix B, Figures 2.4-1 through 2.4-4 Alloy X MPC-24/24E/24EF Appendix B, Section 2.4 8 hrs 16 hrs 16 hrs MPC-32/32F MPC-68/68F/68FF/68M Alloy X MPC-68M Appendix B, Figures 2.4-1 through 2.4-4 4 hrs 12 hrs 12 hrs Alloy X Except Duplex1 MPC-24 Appendix A, Table 3-3 (Regionalized)

OR Appendix A, Table 3-4 (Uniform) 8 hrs 64 hrs 24 hrs MPC-24E/EF MPC-32/32F MPC-68/68F/68FF/68M Alloy X MPC-24 Appendix A, Table 3-3 (Regionalized)

OR Appendix A, Table 3-4 (Uniform) 8 hrs 24 hrs 24 hrs MPC-24E/EF MPC-32/32F MPC-68/68F/68FF/68M Alloy X MPC-24/24E/24EF 0.75 kW 24 hrs 64 hrs 30 days MPC-32/32F 0.5 kW MPC-68/68F/68FF/68M 0.264 kW Note

1) If any component of the MPC is made of duplex, these completion times are not applicable.
2) For patterns developed in accordance with Table 3-1a, Note 9, alternative completion times shall be calculated in accordance with Topical Report HI-2200343-A Revision 2 to Holtec Letter 5014950 8 of 12

PROPOSED CERTIFICATE OF COMPLIANCE NO. 1014 APPENDIX B APPROVED CONTENTS AND DESIGN FEATURES FOR THE HI-STORM 100 CASK SYSTEM to Holtec Letter 5014950 9 of 12

Approved Contents 2.0 Certificate of Compliance No. 1014 Amendment No. 18 Appendix B 2-51 2.4.2 Regionalized Fuel Loading Decay Heat Limits for ZR-Clad Fuel for VENTILATED OVERPACK The maximum allowable decay heat per fuel storage location for intact or undamaged fuel assemblies in regionalized loading is determined using the following equations:

Q(X) = 2 x Q0 / (1 + Xy) y = 0.23 / X0.1 q2 = Q(X) / (n1 x X +n2) q1 = q2 x X Where:

Q0 = Maximum uniform storage MPC decay heat (34 kW)

X = Inner region to outer region assembly decay heat ratio (0.5 X 3) n1 = Number of storage locations in inner region from Table 2.4-2.

n2 = Number of storage locations in outer region from Table 2.4-2.

Allowable heat loads for Damaged Fuel and Fuel Debris in regionalized loading are shown in Table 2.4-5.

Optional loading patterns for MPC-68M are shown in Figures 2.4-1 through 2.4-4.

Alternatively to the heat load patterns in Sections 2.4.1 and 2.4.2, per cell allowable heat loads may be determined per Topical Report HI-2200343-A Revision 2.

to Holtec Letter 5014950 10 of 12

Approved Contents 2.0 Certificate of Compliance No. 1014 Amendment No. 18 Appendix B 2-53 2.4.3 Burnup Limits as a Function of Cooling Time for ZR-Clad Fuel for VENTILATED OVERPACK The maximum allowable ZR-clad fuel assembly average burnup varies with the minimum required fuel assembly cooling time. Tables 2.4-3 and 2.4-4 provide for each MPC the allowable maximum burnup based on the assemblys particular cooling time.These same limits apply for heat load patterns developed in accordance with the topical report, HI-2200343-A, Revision 2.

2.4.3.1 Linear interpolation of burnups between cooling times is permitted. For example, the allowable burnup for a cooling time of 4.5 years may be interpolated between those burnups calculated for 4 year and 5 years.

2.4.3.2 Calculated burnup limits shall be rounded down to the nearest integer.

2.4.3.3 Calculated burnup limits greater than 68,200 MWD/MTU for PWR fuel and 65,000 MWD/MTU for BWR must be reduced to be equal to these values.

2.4.4 When complying with the maximum fuel storage location decay heat limits, users must account for the decay heat from both the fuel assembly and any NON-FUEL HARDWARE, as applicable for the particular fuel storage location, to ensure the decay heat emitted by all contents in a storage location does not exceed the limit.

2.4.5 Fuel Loading Decay Heat Limits for UNVENTILATED OVERPACK Tables 2.4-6a and 2.4-6b provide the maximum allowable decay heat per fuel storage location for MPC-68M in an UNVENTILATED OVERPACK.

A minor deviation from the prescribed loading pattern in an MPCs permissible contents to allow one slightly thermally-discrepant fuel assembly per quadrant to be loaded as long as the peak cladding temperature for the MPC remains below the ISG-11 Rev 3 requirements is permitted for essential dry storage campaigns to support decommissioning.

to Holtec Letter 5014950 11 of 12

Approved Contents 2.0 Certificate of Compliance No. 1014 Amendment No. 18 Appendix B 2-54 2.4.6 Burnup and Cooling Time Qualifications for the MPC-68M for UNVENTILATED OVERPACK The burnup and cooling time for every fuel loaded into the MPC-68M must satisfy the following equation:

= 3 + 2 + +

where, Ct

= Minimum cooling time (years),

Bu

= Assembly-average burnup (MWd/mtU),

A, B, C, D = Polynomial coefficients listed in Table 2.4-9 to Holtec Letter 5014950 12 of 12

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