ML21068A369
| ML21068A369 | |
| Person / Time | |
|---|---|
| Site: | Holtec |
| Issue date: | 03/09/2021 |
| From: | Holtec |
| To: | Office of Nuclear Material Safety and Safeguards |
| Shared Package | |
| ML21068A360 | List: |
| References | |
| 5014917 | |
| Download: ML21068A369 (12) | |
Text
Attachment 7 of Holtec Letter 5014917 TABLE OF CONTENTS 1.0 USE AND APPLICATION ............................................................................... 1.1-1 1.1 Definitions ............................................................................................ 1.1-1 1.2 Logical Connectors .............................................................................. 1.2-1 1.3 Completion Times ................................................................................ 1.3-1 1.4 Frequency ............................................................................................ 1.4-1 2.0 NOT USED ..................................................................................................... 2.0-1 3.0 LIMITING CONDITION FOR OPERATION (LCO) APPLICABILITY ............... 3.0-1 3.0 SURVEILLANCE REQUIREMENT (SR) APPLICABILITY .............................. 3.0-2 3.1 SFSC INTEGRITY ............................................................................ 3.1.1-1 3.1.1 Multi-Purpose Canister........................................................... 3.1.1-1 3.1.2 HI-STORM 100S Version E SFSC Heat Removal System..... 3.1.2-1 3.1.3 MPC Cavity Reflooding .......................................................... 3.1.3-1 3.1.4 Supplemental Cooling System ............................................... 3.1.4-1 3.2 SFSC RADIATION PROTECTION ................................................... 3.2.1-1 3.2.1 TRANSFER CASK Surface Contamination ............................ 3.2.1-1 3.3 SFSC CRITICALITY CONTROL ....................................................... 3.3.1-1 3.3.1 Boron Concentration .............................................................. 3.3.1-1 Table 3-1a MPC Cavity Drying Limits for VENTILATED OVERPACK .................... 3.4-1 Table 3-1b MPC Helium Backfill Limits for UNVENTILATED OVERPACK ............. 3.4-3 Table 3-2a MPC Helium Backfill Limits for VENTILATED OVERPACK .................. 3.4-43 Table 3-2b MPC Helium Backfill Limits for UNVENTILATED OVERPACK ............. 3.4-5 Table 3-3 Completion Time for Actions to Restore HI-STORM 100S Version E SFSC Heat Removal System to Operable.................................................................. 3.4-4 Table 3-4 MPC-32M with up to Sixteen DFIs Soluble Boron Requirements ......... 3.4-5 Table 3-5 MPC-32M with up to Twelve DFCs Soluble Boron Requirements ........ 3.4-6 Table 3-6 MPC-32M with Thirteen to Sixteen DFCs Soluble Boron Requirements ....................................................................................... 3.4-7 Table 3-7 MPC-32/32F and Version 1 Soluble Boron Requirements .................... 3.4-8 4.0 NOT USED ...................................................................................................... 4.0-1 5.0 ADMINISTRATIVE CONTROLS ...................................................................... 5.1-1 5.1 Radioactive Effluent Control Program for HI-STORM 100S Version E .................................................................. 5.1-1 5.2 Cask Transport Evaluation Program for HI-TRAC MS and HI-STORM 100S Version E...................................... 5.2-1 5.3 Radiation Protection Program ............................................................... 5.3-1 5.4 Fabrication Helium Leak Test ............................................................... 5.4-1 Certificate of Compliance No. 1014 Amendment No. 15 Appendix C i 1 of 12
Attachment 7 of Holtec Letter 5014917 Definitions 1.1 1.1 Definitions (continued)
MPC TRANSFER MPC TRANSFER begins when the MPC is lifted off the TRANSFER CASK bottom lid and ends when the MPC is supported from beneath by the OVERPACK or VVM (or the reverse).
NON-FUEL HARDWARE NON-FUEL HARDWARE is defined as Burnable Poison Rod Assemblies (BPRAs), Thimble Plug Devices (TPDs), Control Rod Assemblies (CRAs),
Axial Power Shaping Rods (APSRs), Wet Annular Burnable Absorbers (WABAs), Rod Cluster Control Assemblies (RCCAs), Control Element Assemblies (CEAs), Neutron Source Assemblies (NSAs), water displacement guide tube plugs, orifice rod assemblies, instrument tube tie rods (ITTRs),
vibration suppressor inserts, and components of these devices such as individual rods.
OVERPACK OVERPACKs are the casks which receive and contain the sealed MPCs for interim storage on the ISFSI. They provide gamma and neutron shielding, and in some versions, may provide for ventilated air flow to promote heat transfer from the MPC to the environs. The term OVERPACK does not include the TRANSFER CASK.
PLANAR-AVERAGE INITIAL PLANAR AVERAGE INITIAL ENRICHMENT is the ENRICHMENT average of the distributed fuel rod initial enrichments within a given axial plane of the assembly lattice.
REDUNDANT PORT REDUNDANT PORT COVER DESIGN refers to two COVER DESIGN independent port cover plates per port opening, where each port cover plate contains multiple pass closure welds.
REPAIRED/RECONSTITUTED Spent nuclear fuel assembly which contains dummy FUEL ASSEMBLY fuel rod(s) that displaces an amount of water greater than or equal to the original fuel rod(s) and/or which contains structural repairs so it can be handled by normal means. If irradiated dummy stainless steel rods are present in the fuel assembly, the dummy/replacement rods will be considered in the site specific dose calculations.
(continued)
Certificate of Compliance No. 1014 Amendment No. 165 Appendix C 1.1-4 2 of 12
Attachment 7 of Holtec Letter 5014917 Definitions 1.1 1.1 Definitions (continued)
UNLOADING OPERATIONS UNLOADING OPERATIONS include all licensed activities on an SFSC to be unloaded of the contained fuel assemblies. UNLOADING OPERATIONS begin when the OVERPACK or TRANSFER CASK is no longer suspended from or secured on the transporter and end when the last fuel assembly is removed from the SFSC.
UNLOADING OPERATIONS does not include MPC TRANSFER.
UNVENTILATED OVERPACK The UNVENTILATED OVERPACK is an aboveground OVERPACK which receives and contains the sealed MPC for interim storage at the ISFSI. The UNVENTILATED OVERPACK design is characterized by its absence of inlet and outlet ventilation passages.
VENTILATED OVERPACK The VENTILATED OVERPACK is an aboveground OVERPACK which receives and contains the sealed MPC for interim storage at the ISFSI. The VENTILATED OVERPACK provides passages for airflow to promote heat transfer from the MPC.
ZR ZR means any zirconium-based fuel cladding or fuel channel material authorized for use in a commercial nuclear power plant reactor.
Certificate of Compliance No. 1014 Amendment No. 165 Appendix C 1.1-6 3 of 12
Attachment 7 of Holtec Letter 5014917 Multi-Purpose Canister (MPC) 3.1.1 E. Required Actions and E.1 Remove all fuel assemblies 30 days associated Completion from the SFSC.
Times not met.
SURVEILLANCE REQUIREMENTS SURVEILLANCE FREQUENCY SR 3.1.1.1 Verify that the MPC cavity has been dried in Once, prior to accordance with the applicable limits in Table 3- TRANSPORT 1, within the specified vacuum drying time limits OPERATIONS as applicable.
SR 3.1.1.2 Verify MPC helium backfill quantity is within the Once, prior to limit specified in Table 3-2 for the MPC. Re- TRANSPORT performance of this surveillance is not required OPERATIONS upon successful completion of Action C.2.2.
SR 3.1.1.3 Verify that the helium leak rate through the MPC Once, prior to vent and drain port cover plates (confinement TRANSPORT welds and the base metal) meets the leaktight OPERATIONS criteria of ANSI N14.5-1997. This surveillance does not need to be performed in the MPC utilizing the REDUNDANT PORT COVER DESIGN.
Certificate of Compliance No. 1014 Amendment No. 15 Appendix C 3.1.1-3 4 of 12
Attachment 7 of Holtec Letter 5014917 SFSC Heat Removal System 3.1.2 3.1 SFSC INTEGRITY 3.1.2 HI-STORM 100S VERSION E SFSC Heat Removal System LCO 3.1.2 The HI-STORM 100S VERSION E SFSC Heat Removal System shall be operable
NOTE-------------------------------------------------------
The SFSC Heat Removal System is operable when 50% or more of the inlet and outlet vent areas are unblocked and available for flow or when air temperature requirements are met. This LCO only applies to the VENTILATED OVERPACKs.
APPLICABILITY: During STORAGE OPERATIONS.
ACTIONS
NOTE-----------------------------------------------------
Separate Condition entry is allowed for each SFSC.
COMPLETION CONDITION REQUIRED ACTION TIME A. SFSC Heat Removal A.1 Remove blockage N/A operable but partially (<
50%) blocked B. SFSC Heat Removal B.1 Restore SFSC Heat Table 3-3 System inoperable. Removal System to operable status.
C. Required Action B.1 and C.1 Measure SFSC dose rates Immediately and associated Completion in accordance with the once per 12 hours1.388889e-4 days <br />0.00333 hours <br />1.984127e-5 weeks <br />4.566e-6 months <br /> Time not met. Radiation Protection thereafter Program.
AND C.2.1 Restore SFSC Heat Removal System to Table 3-3 operable status.
OR C.2.2 Transfer the MPC into a TRANSFER CASK. Table 3-3 Certificate of Compliance No. 1014 Amendment No. 15 Appendix C 3.1.2-1 5 of 12
Attachment 7 of Holtec Letter 5014917 MPC Cavity Drying Limits Table 3-1 Table 3-1a MPC Cavity Drying Limits for VENTILATED OVERPACKNote 7 Method of Moisture Fuel Burnup MPC Heat Load (kW)Note 12 Removal (MWD/MTU)
(Notes 1, 2, and 3) 26 (MPC-32 Version 1, VDSNote 5 or FHDNote 6 MPC-68 Version 1) 36.9 (MPC-32 Version 1, All Assemblies < 45,000 VDSNote 8 or FHD MPC-68 Version 1)Note 6 41.2 (MPC-32M)Note 9 VDS or FHD 40 (MPC-32M)Note 10 27 (MPC-32M) VDSNote 4 36.9 (MPC-32 Version 1, One or more assemblies VDSNote 8 or FHD MPC-68 Version 1)Note 6
> 45,000 41.2 (MPC-32M)Note 9 VDSNote 8,11 or FHD 40 (MPC-32M)Note 10 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 0.843 kW for MPC-32M.
- 5. Maximum allowable storage cell heat load is 0.812 kW (MPC-32 Version 1) and 0.382 kW (MPC-68 Version 1).
- 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. For limits applicable to MPC-24/24E/24EF/32/32F/68/68F/68FF/68M see Appendix A Table 3-1.
Certificate of Compliance No. 1014 Amendment No. 15 Appendix C 3.4-1 6 of 12
Attachment 7 of Holtec Letter 5014917 MPC Cavity Drying Limits Table 3-1
- 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.
- 9. Maximum per assembly allowable heat loads defined in Appendix D, Section 2.4.1.
- 10. Maximum per assembly allowable heat loads defined in Appendix D Figures 2.4-1 and 2.4-2.
- 11. Applies when any one storage cell heat load is greater than 0.843kW.
- 12. For MPC-32M, these heat load limits may need to be modified based on fuel height, in accordance with Appendix D Section 2.4.4.
Certificate of Compliance No. 1014 Amendment No. 15 Appendix C 3.4-2 7 of 12
Attachment 7 of Holtec Letter 5014917 MPC Cavity Drying Limits Table 3-1 Table 3-1b MPC-32M Cavity Drying Limits For UNVENTILATED OVERPACK Method of Moisture Fuel Burnup MPC Heat Load (kW) Removal (MWD/MTU)
(Notes 1 and 2)
All burnups 25 (MPC-32M)Note 4 VDS 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. Maximum per assembly allowable heat loads under uniform or regionalized storage defined in Appendix D, Section 2.4.5.
Certificate of Compliance No. 1014 Amendment No. 15 Appendix C 3.4-3 8 of 12
Attachment 7 of Holtec Letter 5014917 MPC Helium Backfill Limits Table 3-2 Table 3-2a MPC Helium Backfill Limits for VENTILATED OVERPACKNotes 1,3 MPC MODEL LIMIT MPC-32MNote 4
- i. Cask Heat Load 41.2 kW 43.0 psig and 46.0 psig Regionalized Loading per Appendix D, Section 2.4.1 ii. Cask Heat Load 40.0 kW Note 2 and 46.8 psig Discrete Loading Patterns per Appendix D, Section 2.4.2 MPC-32 Version 1/ MPC-68 Version 1
- i. All allowable heat loads per Appendix D 49.5 psig and 52.5 psig Section 2.4 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. Minimum permitted helium backfill is equal to:
43.8(Q/Q)
Where:
Q = aggregate heat load for MPC at time of fuel loading (kW)
Q = allowable maximum heat load for the canister in Appendix D, Table 2.4-3 For any scenario where Q/Q 0.9, 0.9 shall be used.
- 3. For limits applicable to MPC-24/24E/24EF/32/32F/68/68F/68FF/68M see Appendix A Table 3-2.
- 4. These heat load limits may need to be modified based on fuel height, in accordance with Appendix D Section 2.4.4 Certificate of Compliance No. 1014 Amendment No. 15 Appendix C 3.4-4 9 of 12
Attachment 7 of Holtec Letter 5014917 MPC Helium Backfill Limits Table 3-2 Table 3-2b MPC Helium Backfill Limits for UNVENTILATED OVERPACKNotes 1 MPC MODEL LIMIT MPC-32MNote 2
- i. Cask Heat Load 25 kW -
uniformly distributed per Appendix D, Section 2.4.5 0.1218 +/-10% g-moles/l or regionalized loading per Appendix D, OR Section 2.4.5 40.0 psig and 43.0 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. These heat load limits may need to be modified based on fuel height, in accordance with Appendix D Section 2.4.4.
Certificate of Compliance No. 1014 Amendment No. 15 Appendix C 3.4-5 10 of 12
Attachment 7 of Holtec Letter 5014917 Radiation Protection Program 5.3 ADMINISTRATIVE CONTROLS AND PROGRAMS 5.3 Radiation Protection Program 5.3.1 Each cask user shall ensure that the Part 50 radiation protection program appropriately addresses dry storage cask loading and unloading, as well as ISFSI operations, including transport of the loaded OVERPACK or TRANSFER CASK outside of facilities governed by 10 CFR Part 50. The radiation protection program shall include appropriate controls for direct radiation and contamination, ensuring compliance with applicable regulations, and implementing actions to maintain personnel occupational exposures As Low As Reasonably Achievable (ALARA). The actions and criteria to be included in the program are provided below.
5.3.2 As part of its evaluation pursuant to 10 CFR 72.212(b)(2)(i)(C), the licensee shall perform an analysis to confirm that the dose limits of 10 CFR 72.104(a) will be satisfied under the actual site conditions and ISFSI configuration, considering the planned number of casks to be deployed and the cask contents.
5.3.3 Based on the analysis performed pursuant to Section 5.3.2, the licensee shall establish individual cask surface dose rate limits for the HI-TRAC TRANSFER CASK and the HI-STORM OVERPACK to be used at the site.
Total (neutron plus gamma) dose rate limits shall be established at the following locations:
- a. The top of the OVERPACK.
- b. The side of the TRANSFER CASK and OVERPACK
- c. The inlet and outlet ducts on the OVERPACK (applicable only for VENTILATED OVERPACKs) 5.3.4 Notwithstanding the limits established in Section 5.3.3, the measured dose rates on a loaded OVERPACK shall not exceed the following values:
- a. 20 mrem/hr (gamma + neutron) on the top of the OVERPACK
- b. 200 mrem/hr (gamma + neutron) on the side of the OVERPACK, excluding inlet and outlet ducts
- c. 4000 mrem/hr (gamma + neutron) on the side of the TRANSFER CASK 5.3.5 The licensee shall measure the TRANSFER CASK and OVERPACK surface neutron and gamma dose rates as described in Section 5.3.8 for comparison against the limits established in Section 5.3.3 or Section 5.3.4, whichever are lower.
Certificate of Compliance No. 1014 Amendment No. 15 Appendix C 5.3-1 11 of 12
Attachment 7 of Holtec Letter 5014917 Radiation Protection Program 5.3 ADMINISTRATIVE CONTROLS AND PROGRAMS 5.3 Radiation Protection Program (contd)
- c. A minimum of five (5) dose rate measurements shall be taken on the top of the OVERPACK. One dose rate measurement shall be taken at approximately the center of the lid and four measurements shall be taken at locations on the top concrete shield, approximately half way between the center and the edge of the top concrete shield, approximately 90 degrees apart around the circumference of the lid.
- d. A dose rate measurement shall be taken on contact at the surface of each inlet and four (4) locations approximately 90 degrees apart around the circumference of the outlet vent of the OVERPACK (applicable only for VENTILATED OVERPACKs).
Certificate of Compliance No. 1014 Amendment No. 15 Appendix C 5.3-3 12 of 12