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MONTHYEARML20064D4672020-03-0404 March 2020 Application for Amendment No. 10 to the Model No. Magnastor Storage Cask - Request for Supplemental Information Project stage: Other ML20143A1022020-05-13013 May 2020 Submission of a Responses to the NRCs Request for Supplemental Information for the NAC International Magnastor Cask System Amendment No. 10 Project stage: Request ML20143A1082020-05-29029 May 2020 Magnastor Amendment 10 Acceptance Letter Project stage: Acceptance Review ML20258A1612020-10-0808 October 2020 Magnastor Amd 10 non-proprietary RAI Enclosure Project stage: RAI ML20258A1592020-10-0808 October 2020 Magnastor Project stage: Request ML20258A1602020-10-0808 October 2020 Magnastor Application Amendment 10 - First Request for Additional Information Letter Project stage: RAI ML21067A0432021-02-28028 February 2021 Enclosure 1 - NAC International Responses to the Us Nuclear Regulatory Commission Request for Additional Information 1 for Magnastor FSAR RAI Responses for Amendment 10, Revision 21A Project stage: Request ML21118A0432021-04-20020 April 2021 NAC International, Inc., Supplemental Responses to the NRCs Request for Additional Information for the Cask System Amendment No. 10 Project stage: Supplement ML21165A0342021-06-14014 June 2021 Notice of Public Meeting with NAC International to Discuss Amendment No. 10 to the Magnastor Storage System Project stage: Meeting ML21173A3492021-06-14014 June 2021 Revised Notice of Public Meeting with NAC International to Discuss Amendment No. 10 to the Magnastor Storage System Project stage: Meeting ML21174A0742021-07-12012 July 2021 Request for Additional Information Magnastor Storage System Amendment No. 10 Project stage: RAI ML21174A0722021-07-12012 July 2021 Magnastor Amd 10 Second RAI Project stage: Request ML21174A0732021-07-12012 July 2021 Application for Amendment No. 10 to the Model No. Magnastor Storage Cask - Second Request for Additional Information Project stage: RAI ML21259A2072021-09-16016 September 2021 Notice of Partially Closed Meeting with NAC International for a Discussion of Low Wind Speed Analysis for Amendment No. 10 to the Magnastor Storage System Project stage: Meeting ML21298A2022021-11-12012 November 2021 Summary of June 30, 2021, Meeting with NAC on Magnastor Amendment 10 Project stage: Meeting 2021-11-12
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Category:Letter
MONTHYEARML24008A2482024-01-0808 January 2024 NAC International, Response to Apparent Violations (a and B) in NRC Inspection Report 72-1031/2023-201; EA-2023-069 ML23283A2382023-12-0707 December 2023 NAC International, Inc. - U.S. Nuclear Regulatory Commission Inspection Report 72-1031/2023-201 ML23250A3242023-09-12012 September 2023 1. Transmittal Letter Magnastor Issuance of Amendment Nos 11 and 12 and Revision of Amendment Nos 0 Through 9 ML23166B0832023-07-0505 July 2023 Independence Spent Fuel Storage Installation - Issuance of Exemption ML23143A3912023-05-23023 May 2023 Independent Spent Fuel Storage Installation - Request for Exemption from NAC-MAGNASTOR Certificate of Compliance 72-1031 - Cask Lid Batch 3 Design Requirements ML23074A2522023-03-29029 March 2023 Application for Amendment No. 13 to the Model No. Magnastor Storage Cask Request for Additional Information ML23076A2272023-03-17017 March 2023 Independent Spent Fuel Storage Installation, Registration of Dry Spent Fuel Transportable Storage Canister Identification Numbers AMZDFX165 and AMZDFX166 and Vertical Concrete Cask Identification Numbers ML23005A2572023-01-0505 January 2023 Request to Withdraw Administrative Controls for Adverse Weather Events During Operations from Magnastor Amendment 12 Supplement ML22349A4682022-12-19019 December 2022 Amendment No. 10 to Certificate of Compliance No. 1031 for the Magnastor Storage System ML22340A5902022-12-0808 December 2022 Acknowledgement Letter - Magnastor Amendment 13 ML22327A2252022-11-23023 November 2022 NAC International - Magnastor Cask System Users CoC Amendment 12 Supplement and Intent to Adopt Letters ML22321A2682022-11-17017 November 2022 Supplement to the Submission of an Amendment Request for the NAC International Magnastor Cask System, Amendment No. 13 ML22308A1942022-11-0909 November 2022 NAC International, Inc. - U.S. Nuclear Regulatory Commission Report No. 72-1031/2022-201 ML22287A0382022-10-13013 October 2022 Supplement to the Submission of an Amendment Request for the NAC International Magnastor Cask System, Amendment No. 13 ML22257A2562022-09-14014 September 2022 Registration of Dry Spent Fuel Transportable Storage Canisters Identification Numbers AMZDFX170 and AMZDFX174 and Vertical Concrete Cask Identification Numbers AMZDNE170 and AMZDNE174 ML22230D0802022-08-18018 August 2022 Independent Spent Fuel Storage Installation - Registration of Dry Spent Fuel Transportable Storage Container ML22216A1102022-08-0404 August 2022 Magnastor Cask System Users CoC Amendments 0 Thru 9 Intent to Adopt Letters ML22208A0782022-07-27027 July 2022 Registration of Use of Cask to Store Spent Fuel ML22196A0232022-07-15015 July 2022 Submittal of Supplemental Information to the Nrc'S Request for Additional Information for the NAC International Magnastor Cask System Amendment No. 11 ML22201A0662022-07-13013 July 2022 NAC International, Inc., Submittal of Data Disk for the Magnastor Cask System, Amendment No. 13 ML22194A9082022-07-13013 July 2022 NAC, Submittal of an Amendment Request for the NAC International Magnastor Cask System, Amendment No. 13 ML22111A3572022-05-16016 May 2022 Letter Issuing Exemption to Catawba ML22111A3112022-05-16016 May 2022 Letter Issuing Exemption to McGuire ML22111A2842022-05-13013 May 2022 Independence Spent Fuel Storage Installation - Issuance of Exemption ML22110A1112022-05-13013 May 2022 Letter Issuing Exemption to TMI-1 ML22125A1532022-05-0505 May 2022 Registration of Use of Casks to Store Spent Fuel ML22118B1622022-04-28028 April 2022 Request for Exemption from NAC-MAGNASTOR Certificate of Compliance 72-1031 - Cask Lid Design Requirements - Supplement RS-22-062, Supplemental Information to Exemption to the Requirements of Certificate of Compliance No. 1031 for the NAC Magnastor Storage System2022-04-26026 April 2022 Supplemental Information to Exemption to the Requirements of Certificate of Compliance No. 1031 for the NAC Magnastor Storage System ML22108A1972022-04-18018 April 2022 RAI Response to Nac'S Amendment Request for the NAC International Magnastor Cask System Amendment No. 12 ML22095A1012022-04-12012 April 2022 Application for Amendment No. 12 to the Model No. Magnastor Storage Cask - Request for Additional Information ML22101A0042022-04-0707 April 2022 Registration of Use of Casks to Store Spent Fuel ML22090A0982022-03-31031 March 2022 Independent Spent Fuel Storage Installation - Request for Exemption from NAC-MAGNASTOR Certificate of Compliance 72-1031 - Cask Lid Design Requirements ML22082A2762022-03-23023 March 2022 Independent Spent Fuel Storage Installation - Registration of Dry Spent Fuel Transportable Storage Canister Identification Numbers AMZDFX164 and AMZDFX168 and Vertical Concrete Cask Identification Numbers ML22077A7692022-03-18018 March 2022 Supplement to Nac'S Amendment Request for the NAC International Magnastor Cask System Amendment No. 12 ML22024A3742022-01-24024 January 2022 Submission of an Amendment Requestfor the NAC International Magnastor Cask System Amendment No. 12 ML22018A0592022-01-11011 January 2022 NAC International, Inc., Submittal of Supplemental Information to the Nrc'S Request for Additional Information for the NAC International Magnastor Cask System Amendment No.11 ML21277A0452021-09-24024 September 2021 Submittal of Final Safety Analysis Report (Fsar), Revision 12, for the NAC Magnastor Cask System ML21251A5302021-09-0202 September 2021 Supplemental Responses to the NRCs Request for Additional Information for the NAC International Magnastor Cask System Amendment No. 10 ML21242A0502021-08-23023 August 2021 Submission of Responses to the Nrc'S Request for Additional Information for the NAC International Magnastor Cask System Amendment No. 11 ML21174A0732021-07-12012 July 2021 Application for Amendment No. 10 to the Model No. Magnastor Storage Cask - Second Request for Additional Information ML21183A1872021-07-0202 July 2021 Independent Spent Fuel Storage Installation, Registration of Dry Spent Fuel Transportable Storage Canister Identification Number AMZDFX163 and Vertical Concrete Cask Identification Number AMZDNE163 ML21102A0872021-05-0707 May 2021 NRC Review of NAC Internationals Response Letter to Inspection Report 07201015/2020201 Notice of Violation EA-20-066; and Response to Disputed Notice of Violation ML21118A0432021-04-20020 April 2021 NAC International, Inc., Supplemental Responses to the NRCs Request for Additional Information for the Cask System Amendment No. 10 ML21078A5142021-03-19019 March 2021 Independent Spent Fuel Storage Installation - Registration of Dry Spent Fuel Transportable Storage Canister Identification Number AMZDFX161 and Vertical Concrete Cask Identification Number AMZDNE161 ML21047A1992021-02-26026 February 2021 Application for Amendment No. 11 to the Model No. Magnastor Storage Cask - First Request for Additional Information ML21067A0422021-02-25025 February 2021 Submission of Responses to the Nrc'S Request for Additional Information for the NAC International Magnastor Cask System Amendment No. 10 ML21050A3262021-02-19019 February 2021 Independent Spent Fuel Storage Installation - Registration of Dry Spent Fuel Transportable Storage Canister ML21036A0372021-01-29029 January 2021 NAC International Reply to Notice of Violation (EA-20-066), January 29, 2021 (Docket Nos.: 72-1015, 72-1025, 72-1031) ML20351A4512020-12-16016 December 2020 License Amendment Request, Proposed Revision to License Conditions and Permanently Defueled Technical Specifications for Permanent Removal of Irradiated Fuel from the Spent Fuel Pool (ISFSI-Only Tech Specs) ML20307A1172020-11-10010 November 2020 Transmittal Letter - Amendment No. 9 to Certificate of Compliance No. 1031 for Magnastor Storage System 2024-01-08
[Table view] Category:Response to Request for Additional Information (RAI)
MONTHYEARML22108A1972022-04-18018 April 2022 RAI Response to Nac'S Amendment Request for the NAC International Magnastor Cask System Amendment No. 12 ML21242A0522021-08-31031 August 2021 Final Safety Analysis Report, Revision 21B, Amendment 11 RAI Responses, Non-Proprietary Version ML20143A1022020-05-13013 May 2020 Submission of a Responses to the NRCs Request for Supplemental Information for the NAC International Magnastor Cask System Amendment No. 10 ML20108F3042020-04-30030 April 2020 Enclosure 1 - NAC International Response to the U.S. Nuclear Regulatory Commission Request for Additional Information ML20108F3172020-04-0909 April 2020 Submission of Responses to the U.S. Nuclear Regulatory Commission Request for Additional Information for Amendment No. 9 to the Certificate of Compliance No. 1031 for the NAC International Magnastor Cask System ML20052D9362018-07-0303 July 2018 Response to Nrg Request for Additional Information (RAI) Regarding NAC Magnastor Cask Loaded to Incorrect Helium Backfill Density 2022-04-18
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May 13, 2020 U.S. Nuclear Regulatory Commission 11555 Rockville Pike Rockville, MD 20852-2738 Attn: Document Control Desk
Subject:
Submission of a Responses to the NRCs Request for Supplemental Information for the NAC International MAGNASTORCask System Amendment No. 10 Docket No. 72-1031
References:
- 1. U.S. Nuclear Regulatory Commission (NRC) Certificate of Compliance (CoC) No. 1031 for the NAC International MAGNASTOR Cask System, Amendment No. 7, March 24, 2019
- 2. MAGNASTOR Cask System Final Safety Analysis Report (FSAR),
Revision 10, NAC International, February 2019
- 3. ED20190099, Submission of a Request to Amend the U.S. Nuclear Regulatory Commission Certificate of Compliance No. 1031 for the NAC International MAGNASTOR Cask System, October 9, 2019
- 4. ED20190125, Submission of a Request to Amend the U.S. Nuclear Regulatory Commission Certificate of Compliance No. 1031 for the NAC International MAGNASTOR Cask System, December 9, 2019
- 5. U.S. Nuclear Regulatory Commission (NRC), Application for Amendment No. 10 to the Model No. MAGNASTOR Storage Cask- Request for Supplemental Information, March 11, 2020 NAC International (NAC) hereby submits responses to the NRCs Request for Supplemental Information (RSI)
(Reference 5). In accordance with NAC' s administrative practices, upon final acceptance of this application, the l 9C changed pages will be reformatted and incorporated into the next revision of the MAGNASTOR FSAR. NAC is requesting an effective date for this amendment to be prior to March 2021.
If you have any comments or questions, please contact me on my direct line at 678-328-1236.
Sffirere~t Wren Fowler Director, Licensing Engineering
Enclosure:
- Response to the NRCs RSI for MAGNASTOR FSAR, Amendment 10 ED20200061 to ED20200061 MAGNASTOR Docket No.: 72-1031 TAC No.: L24757 Enclosure 1 NACINTERNATIONAL RESPONSE TO THE UNITED STATES NUCLEAR REGULATORY COMMISSION REQUEST FOR SUPPLEMENTAL INFORMATION May2020 FOR REVIEW OF THE CERTIFICATE OF COMPLIANCE NO. 1031, AMENDMENT NO. 10 (TAC NO. L24757 DOCKET NO. 72-1031)
May2020 Page 1 of 4 to ED20200061 MAGNASTOR Docket No.: 72-1031 TAC No.: L24757 TABLE OF CONTENTS THERMAL EVALUATION ................................................................................................................................ 3 Page 2 of 4 to ED20200061 MAGNASTOR Docket No.: 72-1031 TAC No.: L24757 NAC INTERNATIONAL RESPONSE TO REQUEST FOR SUPPLEMENTAL INFORMATION THERMAL EVALUATION 4.1 Show that low-wind speeds do not adversely impact the fuel peak clad temperature or other components important to safety such that the components exceed their allowable temperature limits.
Section 4.1 of the SAR states that in the MSO, air exits through 24 outlet holes and two robot access holes. Section 4.11 of the SAR states that since the configuration is symmetrical, the inlets and outlets are simplified into a two-dimensional axisymmetric model by using equivalent dimensions for the air inlets and outlets, which are assumed to extend around the MSO periphery.
Normal low-speed wind could affect the cask thermal performance (by inhibiting the air flow at the outlet vents which could have an impact on the cooling effect by reducing the mass flow rate through the annular gap) because of the many axi-symmetric outlet openings resulting in higher predicted temperatures compared to quiescent conditions. The staff has performed three-dimensional (3-D) sensitivity calculations based on a range of wind speeds which is typically considered normal (in the range of Oto 15 miles per hour) to obtain bounding speeds for several cask designs. The staffs 3-D model included an extended domain to represent the surrounding environment.
Details of these analyses were documented in NUREG-217 4 "Impact of Variation in Environmental Conditions on the Thermal Performance of Dry Storage Casks".
The staff needs this information to have assurance predicted temperatures remain below allowable limits during long term storage.
This information is needed to determine compliance with 10 CFR 72.236(b) and 72.236(+/-).
NAC International Response to Thermal Evaluation RAI 4.1:
NAC International has reviewed NUREG-2174 for its applicability to the new MAGNASTOR cask design. NUREG-2174 determines that sustained low wind speeds (i.e., less than 5 mph) negatively effects the thermal performance of underground cask designs. This is, in part, because of back pressure developed on the outlet vent due to the low wind speed and coupled with the fact that the design of the air inlets requires the incoming air to go downward for the entire length of the cask before coming back up the entire length of the cask and out through the outlet vent.
For vertical systems with at least four inlet and outlet vents, there is no negative effect on thermal performance due to sustained low wind speeds.
NAC has reviewed the NUREG and it is apparent that any outlet back pressure Page 3 of 4 to ED20200061 MAGNASTOR Docket No.: 72-1031 TAC No.: L24757 due low wind is directly compensated by the casks design because that same pressure is forcing air into the cask air inlets. In this design, the inlet pressure due to the wind and the developed buoyancy force caused by the air heating up makes the air go into and straight up the annulus between the cask and the canister and out the outlet vent. Thus, the outlet vent back pressure due to low wind is negated by the fact that it is also forcing air straight into the cask air inlets. Furthermore, air entering the outlet would not impede air flowing up the annulus and would only serve to enhance the air flow out of the other side of the cask.
NAC does not expect any negative thermal performance effects due to low wind speed even though this new cask design has traditional inlets and non-traditional outlet vents. These non-traditional outlet vents are circular and encompass the entire perimeter of the upper cask. Nevertheless, NAC has determined that this cask design is most likely going to be used inside an ISFSI building or enclosure. Casks inside this building are not susceptible to any sustained low wind speeds because it is an indoor ISFSI and not directly exposed to any environmental wind conditions.
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