ML25037A294

NAC International, Inc. - Enclosure 1: Shielded Devices Supplemental RAI Responses NAC-OPTIMUS-L SAR, Revision 25A

ML25037A294
Person / Time
Site:	OPTIMUS-L
Issue date:	02/06/2025
From:	NAC International
To:	Office of Nuclear Material Safety and Safeguards
Shared Package
ML25037A291	List: ML25037A292 ML25037A294
References
ED20250002, EPID L-2024-LLA-0019
Download: ML25037A294 (1)

Text

Atlanta Corporate Headquarters: 2 Sun Court, Suite 220, Peachtree Corners, Georgia 30092 USA Phone 770-447-1144, www.nacintl.com January 2025 Docket No. 71-9390 OPTIMUS-L (OPTImal Modular Universal Shipping Cask)

SAFETY ANALYSIS REPORT Shielded Devices RAI Responses NON-PROPRIETARY VERSION Revision 25A to ED20250002 Page 1 of 14 Shielded Devices Supplemental RAI Responses NAC-OPTIMUS-L SAR, Revision 25A January 2025

NAC INTERNATIONAL OPTIMUS-L Page 2 of 14 NAC INTERNATIONAL SUPPLEMENT TO PROPRIETARY RESPONSES TO THE NUCLEAR REGULATORY COMMISSION OCTOBER 11, 2024 REQUEST FOR ADDITIONAL INFORMATION FOR REVIEW OF THE NAC INTERNATIONAL OPTIMUS-L PACKAGE January 2025

NAC INTERNATIONAL OPTIMUS-L Page 3 of 14 TABLE OF CONTENTS Page STRUCTURAL AND MATERIALS EVALUATION................................................................................ 5 THERMAL EVALUATION...................................................................................................................... 13

NAC INTERNATIONAL OPTIMUS-L Page 4 of 14 SECTION A NAC INTERNATIONAL SUPPLEMENTAL RESPONSES TO REQUEST FOR ADDITIONAL INFORMATION PROPRIETARY RESPONSES

NAC PROPRIETARY INFORMATION REMOVED NAC INTERNATIONAL OPTIMUS-L Page 5 of 14 NAC INTERNATIONAL RESPONSE TO REQUEST FOR ADDITIONAL INFORMATION STRUCTURAL AND MATERIALS EVALUATION 2-1(a) Input additional stress strain curves at different strain rates in the

• DEFINE_TABLE to narrow the range between which the interpolation is performed. It is preferable not to extrapolate data because the extrapolation scheme is not authenticated by any material test results. Alternatively, validate the simulated yield stress values in LS-DYNA for strain rates midway between 0 and 50 and 50 and100 in/in/sec with test data at the same strain rates.

The staff seeks assurance that interpolation using only the test data from testing at the strain rates of 0 and 50 in/in/sec will adequately capture the performance of the material in the range between the two test curves. Typically, rate effects in LS-DYNA are accounted for by defining multiple sets of test curves in the *DEFINE_TABLE. Where each curve represents the yield stress versus the volumetric strain data collected from test conducted at a specific strain rate. Subsequent yield stress required in the simulation is obtained by interpolating between the two test data curves that bound the required strain rate at any time in the simulation. More curves or test data provide more accurate estimates of the material performance. This allows the material property for the crushable foam for each element to vary independently of the adjacent elements and to allow the property of each element to vary with respect to strain rate and time during the solution.

This information is required to determine compliance with 10 CFR 71.71(c)(7) and 71.73(c)(1).

NAC International Response to RAI 2-1(a):

NAC PROPRIETARY INFORMATION REMOVED NAC INTERNATIONAL OPTIMUS-L Page 6 of 14 NAC International Response to RAI 2-1(a) - continued:

NAC PROPRIETARY INFORMATION REMOVED NAC INTERNATIONAL OPTIMUS-L Page 7 of 14 NAC International Response to RAI 2-1(a) - continued:

Summary of Changes:

NAC INTERNATIONAL OPTIMUS-L Page 8 of 14 NAC PROPRIETARY INFORMATION REMOVED NAC INTERNATIONAL RESPONSE TO REQUEST FOR ADDITIONAL INFORMATION STRUCTURAL AND MATERIALS EVALUATION 2-1(b) Include additional curves for stress-strain at strain rates beyond 50 in/in/sec in the

• DEFINE_TABLE as requested in RAI 2-1(a).

Alternatively, provide a basis for the development of any curve used in the solution beyond 50 in/in/sec strain rate using material behavior at high strain rates and a rationale why no interpolation is required over this range.

For strain rates greater than 50 in/in/sec, no interpolation is performed and modified properties at 50 in/in/sec are used. The additional stress-strain curve for a strain rate of 100 in/in/sec is defined by doubling the 50 in/in/sec stress values at the same strains. This assumption needs to be supported by data to ensure that the performance of the Celotex material in the simulation will be consistent with the physical performance of the material in a drop test.

This information is required to determine compliance with 10 CFR 71.71(c)(7) and 71.73(c)(1)

NAC International Response to RAI 2-1(b):

NAC PROPRIETARY INFORMATION REMOVED NAC INTERNATIONAL OPTIMUS-L Page 9 of 14 NAC International Response to RAI 2-1(b) - continued:

NAC PROPRIETARY INFORMATION REMOVED NAC INTERNATIONAL OPTIMUS-L Page 10 of 14 NAC International Response to RAI 2-1(b) - continued:

Summary of Changes:

NAC PROPRIETARY INFORMATION REMOVED NAC INTERNATIONAL OPTIMUS-L Page 11 of 14 NAC INTERNATIONAL RESPONSE TO REQUEST FOR ADDITIONAL INFORMATION STRUCTURAL AND MATERIALS EVALUATION 2-3 Add data to the *DEFINE_TABLE* to capture the effect of the impact loading parallel to the Celotex sheets under end and side drop conditions.

The properties of the Celotex material are from WSRC-TR-00444, Celotex Structural Properties Tests, Westinghouse Savannah River Company. The referenced document was careful to identify that In all cases, the specimens tested with load parallel to the sheets, and without lateral restraint, buckled early in the loading process, then crushed when additional buckling deformation could not occur. Perpendicularly loaded specimens crush progressively with rapid increase in the slope of the stress strain curve as the porosity (void) is closed in the specimen. (This condition is called "lock-up" in the literature.)

Onset of lock-up is delayed for parallel loaded specimens by the buckling process, which results in lower values of stress for given strains. Upon onset of lock-up, the stress-strain curve turns rapidly upward, like that for the perpendicular load case.

The staff therefore requests the applicant to confirm that in both the side drop and the end drop cases the Celotex sheets are loaded perpendicularly. The SAR figure does not clearly show whether that is the case. If not, the applicant should use the revised input in the DEFINE_TABLE for simulating impact loading parallel to the sheets.

This information is required to determine compliance with 10 CFR 71.71(c)(7) and 10 CFR 71.73 (c)(1).

NAC International Response to RAI 2-3:

NAC PROPRIETARY INFORMATION REMOVED NAC INTERNATIONAL OPTIMUS-L Page 12 of 14 NAC International Response to RAI 2 continued:

Summary of Changes:

NAC INTERNATIONAL OPTIMUS-L Page 13 of 14 NAC PROPRIETARY INFORMATION REMOVED NAC INTERNATIONAL RESPONSE TO REQUEST FOR ADDITIONAL INFORMATION THERMAL EVALUATION 3-3 Clarify the results of the radiolysis analysis and pressure analysis provided in new SAR section 4.5.6 and section 4.5.7, respectively, and confirm that content other than the Shielded Device Insert Assembly (SDIA) results in bounding NCT and HAC pressures.

a.

The new SAR section 4.5.6 and document 70000.14-4102 radiolysis calculation applied a fraction of energy absorption value of 0.5 to each material that comprises the SDIA (e.g., cellulose and PVA). However, a technical basis for those values was not clearly provided in the application. Staff notes that the pressure calculation discussed in SAR section 4.5.7 conservatively assumed the cellulose material with the highest G-value absorbed all the energy and that a similar assumption could be used in the radiolysis calculation. In addition, the discussion did not mention if uncertainties in the MCNP model (e.g., convergence) were considered in the SDIA energy deposition value and the analysis did not demonstrate that the potential hydrogen concentration during a fire HAC at the end of the 365-day transport period would be below flammability limits (i.e., higher radiolysis rates due to higher temperatures).

b. The new SAR section 4.5.7 was written to calculate the Cask Containment Vessel (CCV) pressure during the maximum service window (365 days) by considering the additional gas from radiolysis. The container void volume used in the calculation was greater than the CCV void volume reported in section 4.5.6. However, it appears that the void volume calculated in section 4.5.6 does not represent the conditions reported in subsection 1b.

This information is needed to determine compliance with 10 CFR 71.35 and 71.43(d).

NAC International Response to RAI 3-3:

NAC PROPRIETARY INFORMATION REMOVED NAC INTERNATIONAL OPTIMUS-L Page 14 of 14 NAC International Response to RAI 3 continued:

to ED20250002 Page 1 of 3 Page 1 of 3 Proposed Changes for Certificate of Compliance Revision 4 No. 71-9390 for OPTIMUS-L NAC-OPTIMUS-L SAR, Revision 25A January 2025 to ED20250002 Page 2 of 3 Page 2 of 3 CoC Sections (revised)

CoC Page 2 of 7 5.(a)(3)

Drawings (continued) 70000.14-L502, Rev 1P Packaging Assembly OPTIMUS-L 70000.14-L595, Rev 1P Shielded Device Insert Assembly, OPTIMUS-L CoC Sections (new)

CoC Page 3 of 7 5.(b)(1)

Type and form of material (continued)

(vii)

Shielded Devices are shielded steel weldments containing sealed sources meeting the following specifications.

Parameter Shielded Device Maximum weight (Shielded Device) 2,200 lb. (997 kg ref.)

Maximum Content Activity (Shielded Device) 60Co - 5 Ci & 137Cs - 2800 Ci Maximum Surface Dose Rate (Shielded Device) 100 mrem/hr Maximum Dimensions Height 40 in. (101.6 cm ref.)

Diameter 14 in. excluding beam port, if present (35.56 cm ref.)

to ED20250002 Page 3 of 3 Page 3 of 3 CoC Page 6 of 7 5.(b)(2)

Maximum quantity of material per package (continued)

(ix)

For Shielded Devices, as described in Item 5.(b)(1)(vii):

Shielded Devices, contents, are limited to special and normal form sealed source content. The Shielded Device Insert Assembly is configured in the CCV cavity for transportation, shown General Arrangement Drawing 70000.14-L595. The insert consists of two (2) axial aluminum spacers, placed at the bottom and top of the configuration, with cellulosic fiberboard radial insert situated between the axial spacers.

CoC Page 6 of 7 5.(c)

Criticality Safety Index For, 5.(b)(2) (ix) Shielded Devices 0.0 8.

Shoring or dunnage (e.g., spacers) may be placed between contents and the CCV cavity, baskets and/or tubes to prevent excessive movement during transport. The material shall not react negatively with the packaging materials or contents and should have a melting temperature above 300°F to ensure the materials maintain their geometry under routine and normal conditions of transport.

9.

Any non-metallic components must have an auto-ignition temperature of 300°F or higher and must be evaluated for gas generation in accordance with Attachment 7.5-3 prior to shipment.

10.

All radioactive contents shall be packaged in secondary container(s) (e.g., drums, liners, specialty bags, etc.).

11.

TRISO Compacts shall be shipped dry, i.e., no free liquids and may have non-metallic adhesive-backed seals or labels included as contents.

12.

Hydrogen must be limited to a molar quantity that would be no more than 5% by the volume of the innermost layer of confinement during transport. The port of the CCV lid shall be plugged. Compliance with the hydrogen and other flammable gas limit must be demonstrated for each shipment.

13.

Transport by air is authorized for packages, except those items specifically prohibited for air transport, e.g., fissile material.

14.

The package authorized by this certificate is hereby approved for use under the general license provisions of 10 CFR 71.17.

15.

Revision No. 3 and 4 of this certificate may be used until November 30, 2025.

16.

Expiration date: December 31, 2026.

to ED20250002 Page 1 of 2 List of Calculations NAC-OPTIMUS-L SAR, Revision 25A January 2025 to ED20250002 Page 2 of 2 List of Calculations

1. 70000.14-2110 Rev. 2

2. 70000.14-4102 Rev. 1 CALCULATIONS ARE PROPRIETARY AND WITHHELD IN THEIR ENTIRETY PER 10 CFR 2.390 to ED20250002 Page 1 of 3 List of SAR Changes NAC-OPTIMUS-L SAR, Revision 25A January 2025 to ED20250002 Page 2 of 3 List of Changes for the NAC-OPTIMUS-L SAR, Revision 25A Note:

The List of Effective Pages and the Chapter Table of Contents, List of Figures and List of Tables have been revised accordingly to reflect the list of changes detailed below, if needed.

Chapter 1 Page 1.2-13, revised and added text to the bottom of the page where indicated.

Chapter 2 Page 2.12-62, added text to first paragraph of Section 2.12.6.2.1 where indicated.

Page 2.12-63, text flow change.

Page 2.12-64, replaced Figure 2.12.6-2.

Page 2.12-67, revised text in third and fourth paragraphs of Section 2.12.6.4.1 where indicated.

Page 2.12-68, revised text in the middle and bottom of the page where indicated.

Page 2.12-69, revised text at the bottom of the page where indicated.

Page 2.12-78, revised text in Tables 2.12.6-2 thru 2.12.6-4, as well as Note 1 for Table 2.12.6-2 where indicated.

Page 2.12-79, revised text at the bottom of the page where indicated.

Page 2.12-80, added text to the first paragraph on the page and revised text at the bottom of the page where indicated.

Page 2.12-81, revised text at the top of the page where indicated.

Pages 2.12-82 thru 2.12-84, text flow changes.

Page 2.12-85, revised text in Tables 2.12.6-5 thru 2.12.6-7 where indicated.

Chapter 3 No Changes Chapter 4 Pages 4.5-26, revised text in the middle of the page where indicated.

Page 4.5-27, deleted embedded table and added Table 4.5-4, replaced second paragraph on the page, revised text towards the bottom of the page where indicated, and deleted text at the bottom of the page where indicated.

Page 4.5-28, replaced text at the top of the page and added Table 4.5-5.

Page 4.5-29, added Number 3 title line and reformatted sub-letters, also added text to Item a.

where indicated.

Page 4.5-30, replaced text on the page where indicated.

Page 4.5-31, added Case 3 to the beginning of the page where indicated. Text flow change moved Section 4.5.7 to this page.

to ED20250002 Page 3 of 3 Page 4.5-32, modified and added a paragraph to the bottom of the page where indicated.

Chapter 5 Page 5.5-35, added text to the second paragraph where indicated.

Chapter 6 thru Chapter 8 No Changes to ED20250002 Page 1 of 1 List of Effective Pages and SAR Changed Pages NAC-OPTIMUS-L SAR, Revision 25A January 2025

Atlanta Corporate Headquarters: 2 Sun Court, Suite 220, Peachtree Corners, Georgia 30092 USA Phone 770-447-1144, www.nacintl.com January 2025 Docket No. 71-9390 OPTIMUS-L (OPTImal Modular Universal Shipping Cask)

SAFETY ANALYSIS REPORT NON-PROPRIETARY VERSION Revision 25A

OPTIMUS-L Safety Analysis Report January 2025 Docket No. 71-9390 Revision 25A List of Effective Pages Page 1 of 2 Chapter 1 Page 1-i thru 1-ii............... Revision 24A Page 1-1................................. Revision 1 Page 1.1-1.......................... Revision 24B Page 1.1-2.............................. Revision 1 Page 1.2-1 thru 1.2-2.............. Revision 1 Page 1.2-3......................... Revision 24A Page 1.2-4.......................... Revision 24B Page 1.2-5......................... Revision 24A Page 1.2-6.......................... Revision 24B Page 1.2-7 thru 1.2-12....... Revision 24A Page 1.2-13....................... Revision 25A Page 1.2-14 thru 1.2-15...... Revision 24B Page 1.2-16 thru 1.2-21..... Revision 24A Page 1.3-1 thru 1.3-4......... Revision 24A 15 drawings (see Section 1.3)

Chapter 2 Page 2-i.................................. Revision 1 Page 2-ii............................ Revision 24A Page 2-iii................................ Revision 1 Page 2-iv thru 2-v.............. Revision 24A Page 2-vi................................ Revision 1 Page 2-vii.......................... Revision 24A Page 2-1............................ Revision 24A Page 2.1-1 thru 2.1-20............ Revision 1 Page 2.2-1 thru 2.2-11............ Revision 1 Page 2.3-1 thru 2.3-4.............. Revision 1 Page 2.4-1.............................. Revision 1 Page 2.5-1 thru 2.5-14............ Revision 1 Page 2.6-1 thru 2.6-37............ Revision 1 Page 2.7-1 thru 2.7-52............ Revision 1 Page 2.8-1.............................. Revision 1 Page 2.9-1.............................. Revision 1 Page 2.10-1............................ Revision 1 Page 2.11-1............................ Revision 1 Page 2.12-1 thru 2.12-2.......... Revision 1 Page 2.12-3....................... Revision 24A Page 2.12-4 thru 2.12-57........ Revision 1 Page 2.12-58 thru 2.12-61. Revision 24A Page 2.12-62 thru 2.12-64. Revision 25A Page 2.12-65 thru 2.12-66. Revision 24A Page 2.12-67 thru 2.12-69. Revision 25A Page 2.12-70 thru 2.12-77. Revision 24A Page 2.12-78 thru 2.12-85. Revision 25A Chapter 3 Page 3-i thru 3-iii.............. Revision 24A Page 3-1............................ Revision 24A Page 3.1-1 thru 3.1-5.............. Revision 1 Page 3.2-1 thru 3.2-5.............. Revision 1 Page 3.3-1 thru 3.3-20............ Revision 1 Page 3.4-1 thru 3.4-18............ Revision 1 Page 3.5-1.............................. Revision 1 Page 3.5-2 thru 3.5-15....... Revision 24A Chapter 4 Page 4-i thru 4-ii............... Revision 25A Page 4-1................................. Revision 1 Page 4.1-1 thru 4.1-3.............. Revision 1 Page 4.2-1.......................... Revision 24B Page 4.3-1.......................... Revision 24B Page 4.4-1.............................. Revision 1 Page 4.5-1 thru 4.5-24............ Revision 1 Page 4.5-25........................ Revision 24B Page 4.5-26 thru 4.5-32..... Revision 25A Chapter 5 Page 5-i............................. Revision 24A Page 5-ii thru 5-iii.............. Revision 24B Page 5-1............................ Revision 24A Page 5.1-1.............................. Revision 1 Page 5.1-2......................... Revision 23D Page 5.1-3.............................. Revision 1 Page 5.1-4......................... Revision 23D Page 5.2-1 thru 5.2-4.............. Revision 1 Page 5.3-1 thru 5.3-8.............. Revision 1 Page 5.4-1 thru 5.4-14............ Revision 1 Page 5.5-1......................... Revision 24A Page 5.5-2 thru 5.5-11............ Revision 1 Page 5.5-12 thru 5.5-13..... Revision 23D Page 5.5-14 thru 5.5-22..... Revision 24A Page 5.5-23........................ Revision 24B Page 5.5-24 thru 5.5-30..... Revision 24A Page 5.5-31........................ Revision 24B Page 5.5-32 thru 5.5-33..... Revision 24A Page 5.5-34........................ Revision 24B Page 5.5-35....................... Revision 25A Page 5.5-36 thru 5.5-53...... Revision 24B

OPTIMUS-L Safety Analysis Report January 2025 Docket No. 71-9390 Revision 25A List of Effective Pages (contd)

Page 2 of 2 Chapter 6 Page 6-i thru 6-vii.................. Revision 1 Page 6-1................................. Revision 1 Page 6.1-1 thru 6.1-2.............. Revision 1 Page 6.2-1 thru 6.2-4.............. Revision 1 Page 6.3-1 thru 6.3-23............ Revision 1 Page 6.4-1 thru 6.4-15............ Revision 1 Page 6.5-1 thru 6.5-18............ Revision 1 Page 6.6-1 thru 6.6-20............ Revision 1 Page 6.7-1.............................. Revision 1 Page 6.8-1 thru 6.8-20............ Revision 1 Page 6.9-1.............................. Revision 1 Page 6.9.1-1 thru 6.9.1-2........ Revision 1 Page 6.9.2-1 thru 6.9.2-2........ Revision 1 Page 6.9.3-1 thru 6.9.3-19...... Revision 1 Page 6.9.4-1........................... Revision 1 Page 6.9.5-1........................... Revision 1 Page 6.9.6-1........................... Revision 1 Page 6.9.7-1........................... Revision 1 Page 6.9.8-1 thru 6.9.8-7........ Revision 1 Page 6.10-1 thru 6.10-2.......... Revision 1 Chapter 7 Page 7-i.................................. Revision 1 Page 7-1 thru 7-3.................... Revision 1 Page 7.1-1 thru 7.1-2.............. Revision 1 Page 7.1-3 thru 7.1-5......... Revision 24A Page 7.2-1 thru 7.2-2.............. Revision 1 Page 7.3-1 thru 7.3-2.............. Revision 1 Page 7.4-1.............................. Revision 1 Page 7.5-1 thru 7.5-2.............. Revision 1 Page 7.5-3 thru 7.5-17....... Revision 23D Page 7.5-18 thru 7.5-24.......... Revision 1 Chapter 8 Page 8-i thru 8-ii.................... Revision 1 Page 8-1................................. Revision 1 Page 8.1-1 thru 8.1-3.............. Revision 1 Page 8.1-4......................... Revision 24A Page 8.1-5.............................. Revision 1 Page 8.2-1 thru 8.2-6.............. Revision 1 Page 8.2-7......................... Revision 24A Page 8.2-8.............................. Revision 1 Page 8.3-1......................... Revision 24A

OPTIMUS-L Package SAR January 2025 Docket No. 71-9390 Revision 25A NAC International 1.2-13 Maximum Quantity of TRISO Compacts per Package:

1. Maximum total weight 581 pounds (263 kg).

2. Maximum enrichment 20% U-235.

3. Total mean uranium loading 68 kgU

4. Maximum mean matrix density 1.8 g/cc.

For TRISO Compacts, the fuel may originate from enriched slightly contaminated uranium with trace quantity limits. The following table shows the maximum concentrations of the content, including contaminants. U-238 is not listed as it is assumed to be the remainder of the uranium concentration.

Isotope Maximum content U-232 2.6 x 10-9 g/gU-235 U-234 1.00 x 10-2 g/gU-235 U-235 2.00 x 10-1 g/gU U-238 Balance of Uranium Np-237 3.85 x 10-6 g/gU-235 Pu-238 1.56 x 10-10 g/gU-235 Pu-239/Pu-240 4.29 x 10-8 g/gU-235 Fission Products 0.25 mCi/gU Loading Restrictions:

1. TRISO compacts shall be shipped in the GEO basket assembly.

2. TRISO compacts shall not protrude above the top end of the GEO basket fuel tubes.

3. TRISO compact shall be shipped dry (i.e., no free liquids).

4. Shoring or dunnage (e.g., spacers) may be placed between contents and the CCV cavity, baskets and/or tubes to prevent excessive movement during transport. The material shall not react negatively with the packaging materials or contents and should have a melting temperature above 300°F to ensure the materials maintain their geometry under routine and normal conditions of transport.

5. Non-metallic adhesive-backed seals or labels may be included as contents.

6. The non-metallic components must have an auto-ignition temperature of 300°F or higher and must be evaluated for gas generation in accordance with Attachment 7.5-3 prior to shipment.

OPTIMUS-L Package SAR January 2025 Docket No. 71-9390 Revision 25A NAC International 2.12-62 2.12.6.2 Materials 2.12.6.2.1 Material Properties and Specifications NAC PROPRIETARY INFORMATION REMOVED

OPTIMUS-L Package SAR January 2025 Docket No. 71-9390 Revision 25A NAC International 2.12-63 2.12.6.2.2 Chemical, Galvanic or Other Reactions The position of the shielded device is maintained by the Shielded Device Insert Assembly, which consists of cellulosic fiberboard inserts and aluminum spacer plates. The shielded devices are typically comprised of heavy lead shielding encased within a carbon steel and/or stainless steel shell with internal tungsten and stainless steel source rod/holder. The sealed source is typically fully encapsulated in stainless steel.

Shielded devices will be handled and loaded dry and during transportation, the CCV precludes the introduction of any moisture from the environment into its cavity. The absence of water significantly reduces the potential for adverse chemical and galvanic reactions. The lead shielding in the body of the shielded device is fully encased in its steel/stainless steel weldment and cannot be affected by water, atmospheric moisture, or any of the other materials present within the CCV cavity. No mechanism for reaction between the cellulosic fiberboard/PVA adhesive and the materials of the CCV or shielded device has been identified. Therefore, no significant chemical, galvanic, or other reactions are expected between the CCV, the Shielded Device Insert Assembly, and the content (shielded device).

2.12.6.2.3 Effects of Radiation on Material The shielded devices are limited to a measured surface dose rate not to exceed 100 mrem/hr which ensures no significant fluence to any of the materials of the Shielded Device Insert Assembly. Therefore, no degradation of the Shielded Device Insert Assembly materials is expected.

OPTIMUS-L Package SAR January 2025 Docket No. 71-9390 Revision 25A NAC International 2.12-64 Figure 2.12.6-2 Fiberboard Material Properties at Cold Temperature NAC PROPRIETARY INFORMATION REMOVED

OPTIMUS-L Package SAR January 2025 Docket No. 71-9390 Revision 25A NAC International 2.12-67 applicable criteria from NUREG-6007 [2.23]. The spacer plates are evaluated for end drop condition using applicable stress criteria from ASME Code subsection NF [2.2].

2.12.6.4.1 NCT Side Drop Evaluations NAC PROPRIETARY INFORMATION REMOVED

OPTIMUS-L Package SAR January 2025 Docket No. 71-9390 Revision 25A NAC International 2.12-68 NAC PROPRIETARY INFORMATION REMOVED

OPTIMUS-L Package SAR January 2025 Docket No. 71-9390 Revision 25A NAC International 2.12-69 NAC PROPRIETARY INFORMATION REMOVED

OPTIMUS-L Package SAR January 2025 Docket No. 71-9390 Revision 25A NAC International 2.12-78 Table 2.12.6-2 Summary of CCV Force Evaluation for the NCT Side Drop Table 2.12.6-3 Accelerations for Bolt Stress Evaluation for NCT Side Drop Table 2.12.6-4 Summary of Bolt Stress Evaluation for NCT Side Drop NAC PROPRIETARY INFORMATION REMOVED

OPTIMUS-L Package SAR January 2025 Docket No. 71-9390 Revision 25A NAC International 2.12-79 2.12.6.5 Hypothetical Accident Conditions The governing HAC test for the OPIMUS-L packaging containing shielded device is the free drop test. As shown in Section 7.1, peak rigid-body acceleration for the HAC bottom corner, bottom oblique, top corner, and top oblique drop orientations are significantly less than the HAC top end, bottom end, and side drop orientations. As such, the following evaluations are focused on the HAC end drop and side drop conditions. The following sections describe the structural evaluation of the CCV with shielded device for HAC side drop and end drop conditions. The retaining bolts for the beam port shipping plug and the spacer plates are evaluated for side drop and end drop conditions, respectively, using applicable stress criteria from ASME Code, Appendix F [2.6], as shown in Table 2.1-3.

2.12.6.5.1 HAC Side Drop Evaluations NAC PROPRIETARY INFORMATION REMOVED

OPTIMUS-L Package SAR January 2025 Docket No. 71-9390 Revision 25A NAC International 2.12-80 NAC PROPRIETARY INFORMATION REMOVED

OPTIMUS-L Package SAR January 2025 Docket No. 71-9390 Revision 25A NAC International 2.12-81 NAC PROPRIETARY INFORMATION REMOVED

OPTIMUS-L Package SAR January 2025 Docket No. 71-9390 Revision 25A NAC International 2.12-82 NAC PROPRIETARY INFORMATION REMOVED

OPTIMUS-L Package SAR January 2025 Docket No. 71-9390 Revision 25A NAC International 2.12-83 NAC PROPRIETARY INFORMATION REMOVED

OPTIMUS-L Package SAR January 2025 Docket No. 71-9390 Revision 25A NAC International 2.12-84 NAC PROPRIETARY INFORMATION REMOVED

OPTIMUS-L Package SAR January 2025 Docket No. 71-9390 Revision 25A NAC International 2.12-85 Table 2.12.6-5 Summary of CCV Force Evaluation for HAC Side Drop Table 2.12.6-6 Accelerations for Bolt Stress Evaluation for HAC Side Drop Table 2.12.6-7 Summary of Bolt Stress Evaluation for HAC Side Drop NAC PROPRIETARY INFORMATION REMOVED

OPTIMUS-L Package SAR January 2025 Docket No. 71-9390 Revision 25A NAC International 4-i Chapter 4 Containment Table of Contents 4

CONTAINMENT............................................................................................................ 4-1 4.1 Description of the Containment System....................................................................... 4.1-1 4.2 Containment Under Normal Conditions of Transport.................................................. 4.2-1 4.2.1 NCT Pressurization of the Containment Vessel............................................... 4.2-1 4.2.2 NCT Containment Criterion............................................................................. 4.2-1 4.2.3 Compliance with NCT Containment Criterion................................................. 4.2-1 4.3 Containment Under Hypothetical Accident Conditions............................................... 4.3-1 4.3.1 HAC Pressurization of the Containment Vessel............................................... 4.3-1 4.3.2 HAC Containment Criterion............................................................................. 4.3-1 4.3.3 Compliance with HAC Containment Criterion................................................. 4.3-1 4.4 Leakage Rate Tests for Type B Packages..................................................................... 4.4-1 4.4.1 Fabrication Leakage Rate Test.......................................................................... 4.4-1 4.4.2 Maintenance Leakage Rate Test....................................................................... 4.4-1 4.4.3 Periodic Leakage Rate Test.............................................................................. 4.4-1 4.4.4 Pre-shipment Leakage Rate Test...................................................................... 4.4-1 4.5 Appendices.................................................................................................................... 4.5-1 4.5.1 References......................................................................................................... 4.5-1 4.5.2 Flammable Gas Calculations / Requirements................................................... 4.5-2 4.5.3 Chemical Compatibility of TRU Waste Contents............................................ 4.5-3 4.5.4 Hydrogen Concentration Calculations.............................................................. 4.5-4 4.5.5 Pressure Calculations for TRU Waste........................................................... 4.5-23 4.5.6 Hydrogen Generation Calculation for the Shielded Device Insert Assembly and Content................................................................................... 4.5-25 4.5.7 Pressure Calculation for the Shielded Device Insert Assembly and Content................................................................................... 4.5-31

OPTIMUS-L Package SAR January 2025 Docket No. 71-9390 Revision 25A NAC International 4-ii List of Figures Figure 4.1-1 - Packaging Containment System...................................................................... 4.1-3 List of Tables Table 4.5-1 - TRU Waste Contents - Flammability Limits.................................................. 4.5-24 Table 4.5-2 - TRU Waste Maximum Hydrogen G-Values and Activation Energies........... 4.5-24 Table 4.5-3 - TRU Waste Minimum Hydrogen Release Rates............................................ 4.5-24 Table 4.5-4 - Activation and T2 G-Values for SDIA Materials........................................... 4.5-27 Table 4.5-5 - Adjusted G-values for PVA and Cellulose..................................................... 4.5-28

OPTIMUS-L Package SAR January 2025 Docket No. 71-9390 Revision 25A NAC International 4.5-26 NAC PROPRIETARY INFORMATION REMOVED

OPTIMUS-L Package SAR January 2025 Docket No. 71-9390 Revision 25A NAC International 4.5-27 NAC PROPRIETARY INFORMATION REMOVED

OPTIMUS-L Package SAR January 2025 Docket No. 71-9390 Revision 25A NAC International 4.5-28 NAC PROPRIETARY INFORMATION REMOVED

OPTIMUS-L Package SAR January 2025 Docket No. 71-9390 Revision 25A NAC International 4.5-29 NAC PROPRIETARY INFORMATION REMOVED

OPTIMUS-L Package SAR January 2025 Docket No. 71-9390 Revision 25A NAC International 4.5-30 NAC PROPRIETARY INFORMATION REMOVED

OPTIMUS-L Package SAR January 2025 Docket No. 71-9390 Revision 25A NAC International 4.5-31 4.5.7 Pressure Calculation for the Shielded Device Insert Assembly and Content NAC PROPRIETARY INFORMATION REMOVED

OPTIMUS-L Package SAR January 2025 Docket No. 71-9390 Revision 25A NAC International 4.5-32 NAC PROPRIETARY INFORMATION REMOVED

OPTIMUS-L Package SAR January 2025 Docket No. 71-9390 Revision 25A NAC International 5.5-35 NAC PROPRIETARY INFORMATION REMOVED