ML18145A236

NAC-STC Safety Analysis Report, Partial RAI Responses, Revision 18A

ML18145A236
Person / Time
Site:	07109235
Issue date:	03/31/2018
From:	NAC International
To:	Spent Fuel Licensing Branch
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ML18149A011	List: ML18145A236
References
ED20180025
Download: ML18145A236 (31)

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ANAC ffffl INTE RNA TIO NAL Atlanta Corporate Headquarters: 3950 East Jones Bridge Road, Norcross, Georgia 30092 USA Phone 770-447-1144, Fax 770-447-1797, www.nacintl.com

ED20180025 RAI Responses for NAC-STC SAR, Revision 18A March 2018 1 of 1

NACINTERNATIONAL NON-PROPRIETARY RESPONSES TO THE UNITED ST A TES NUCLEAR REGULATORY COMMISSION REQUEST FOR ADDITIONAL INFORMATION February 2018 FOR REVIEW OF THE CERTIFICATE OF COMPLIANCE NO. 9235, STC TRANSPORATION PACKAGE (CoC NO. 9235 DOCKET NO. 71-9235)

March 2018 TABLE OF CONTENTS ACCEPTANCE AND MAINTENANCE TESTS EVALUATION............................................................. 3 NAC INTERNATIONAL RESPONSE TO REQUEST FOR ADDITIONAL INFORMATION ACCEPTANCE AND MAINTENANCE TESTS EVALUATION 8.6 Provide additional clarification for the alternate lead pour procedures.

Section 8.4.2.2 states that during the lead pour the bottom end of the filler-tube is kept below the surface of the molten lead to preclude the formation of voids in the lead.

Clarify whether the same practice is necessary for the alternate procedure.

Section 8.4.3.2 states that the body weldment will be heated in a steady, uniform, and controlled manner. Provide the allowable heating rates.

Section 8.4.3.2 states that the temperature of the entire body weldment is maintained between 640°F (338°C) and 740°F (393°C) throughout the lead pour operations, approximately. Provide clarification on what "approximately" is referring to in this context.

Section 8.4.3.3 states that the cooldown rate is held steady, uniform and controlled manner. Provide maximum cooldown rate and the maximum allowable temperature differential between the inner and outer shell.

This information is needed to determine compliance with 10 CFR 71.3I(c) and 7I.33(a)(5).

NAC International Response to Acceptance and Maintenance Tests Evaluation RAJ 8-6:

When implementing the alternate lead pour procedure, the bottom end of the filler-tube is kept below the surface of the molten lead to preclude the formation of voids in the lead.

SAR Section 8.4.3.2, Step 4, has been revised to include this practice.

SAR Section 8.4.3.2, Step 3, has been revised to include the same allowable heat up rate which is included in SAR Section 8.4.2.2 for the standard lead pour procedure.

SAR Section 8.4.3.2 has been revised to remove the word "approximately" from the end of Step 3.

SAR Section 8.4.3.3 has been revised to include cooldown requirements that prevent the development of a temperature differentials that exceed what is analyzed. Direct measurement of any temperature differential during the cooldown process is no longer required.

The alternate lead pour cooldown procedure differs significantly from the currently approved standard method. Specifically, the standard method utilizes water sprayers that cool the outside of the cask body only. The alternate method utilizes a bath system where both the inside and outside of the cask body are cooled simultaneously by the same water bath. Thereby, significantly reducing any thermal gradients.

However, to preclude the development of any thermal gradients which are greater than what is analyzed, the cooldown procedure for the alternate method is being revised to include a minimum inlet water temperature to the bath of 45°F (7°C) and a maximum rate ofrise for the bath water level of 23.62 inches (600mm)/hr, in lieu of a directly measured cooldown rate. These two requirements together limit the development of any radial or axial thermal gradients and prevent the development of any thermal gradients greater than what is analyzed.

Enclosed in this submittal is the proprietary NAC calculation that demonstrates these two cooldown limits prevent the development of radial and axial thermal gradients greater than the analyzed limit of l 60°F.

ED20180025 List of Drawing Changes NAC-STC SAR, Revision 18A March 2018 Page 1 of3

List of Drawing Changes, NAC-STC SAR, Revision 18A Drawing 423-209, Rev 1

1. Updated title block to current standard

2. Revised next assembly to "423-900" was "423-100"

3. Added a note that reads "Localized dimensional variation beyond specified tolerances are permitted as a result of weld distortion provided that the net sections of the balsa wood and redwood are not affected."

4. Zone E6, revised dimension to "087.1 +.1/-.2", was "087.1 ".

Drawing 423-210, Rev 1

1. Updated title block to current standard

2. Revised next assembly to "423-900" was "423-100"

3. Revised est. weight to "8865 lbs", was "140 lbs"

4. Added a note that reads "Localized dimensional variation beyond specified tolerances are permitted as a result of weld distortion provided that the net sections of the balsa wood and redwood are not affected."

5. Zone E6, revised dimension to "087.1 +.1/-.2", was "087.1 ".

Drawing 423-257, Rev 3

1. Updated title block to current standard

2. Added a note that reads "Localized dimensional variation beyond specified tolerances are permitted as a result of weld distortion provided that the net sections of the balsa wood and redwood are not affected."

3. Zone D3, revised dimension to "087.1 +.1/-.2", was "087.1".

Drawing 423-258, Rev 3

1. Updated title block to current standard

2. Added a note that reads "Localized dimensional variation beyond specified tolerances are permitted as a result of weld distortion provided that the net sections of the balsa wood and redwood are not affected."

3. Zone D3, revised dimension to "087.1 +.1/-.2", was "087.1 ".

ED20180025 Page 2 of3

Drawing 423-802, Sheet 1 of 7, Revision 25 Sheet 3:

I. Zone F2, revised dimension to "12.15 +.15/-.06", was "12.15".

Sheet 5:

I. Zone El, revised dimension to "(12.15)", was "12.15".

Drawing 423-802, Sheet 1 of 7, Revision 24 Revision 24 is currently under NRC Review (i.e., Submittal l 7D).

ED20180025 Page 3 of3

ED20180025 Supporting Calculations for NAC-STC SAR, Revision 18A March 2018 1 of I

List of Calculations and Supporting Documents

1. Calculation 30045-3000, Revision 0 Calculation withheld in its entirety per 10 CFR 2.390.

ED20180025 I of I

ED20180025 Proposed Changes for Certificate of Compliance Revision 19 NAC-STC SAR, Revision 18A March 2018 Page l of2

CoC Sections (revised)

Page 5 of 19 5.(a)(3)

Drawings (i)

The cask is constructed and assembled in accordance with the following Nuclear Assurance Corporation (now NAC International) Drawing Nos.:

Page 6 of 19 423-800, sheets 1-3, Rev. 19P & 19NP 423-802, sheets 1-7, Rev. 25 423-803, sheets 1-2, Rev. 14 423-804, sheets 1-3, Rev. 12 423-805, sheets 1-2, Rev. 8 423-806, sheets 1-2, Rev. 13 423-807, sheets 1-3, Rev. 5 5.(a)(3)

Drawings 423-811, sheets 1-2, Rev. 13 423-812, Rev. 7 423-900, Rev. 8 423-209, Rev. 1 423-210, Rev. 1 423-901, Rev. 3 (ii)

For the directly loaded configuration, the basket is constructed and assembled in accordance with the following Nuclear Assurance Corporation (now NAC International)

Drawing Nos.:

Page 7 of 19 423-870, Rev. 7 423-871, Rev. 5 423-872, Rev. 6 423-873, Rev. 2 5.(a)(3)

Drawings (Continued) 423-874, Rev. 3 423-875, sheets 1-2, Rev. 11 423-878, sheets 1-2, Rev. 5 423-880, Rev. 2P & lNP (v)

The Balsa Impact Limiters are constructed and assembled in accordance with the following NAC International Drawing Nos.:

ED20180025 423-257, Rev. 3 423-258, Rev. 3 Page 2 of2 423-843, Rev. 6 423-859, Rev. 1

ED20180025 List of Changes NAC-STC SAR, Revision 18A March 2018 Page 1 of2

List of Changes, NAC-STC SAR, Revision 18A Chapter 1 Page 1-iii, modified List of Drawings as needed to reflect drawing revisions.

Chapter 2 No changes.

Chapter 3 No changes.

Chapter 4 No changes.

Chapter 5 No changes.

Chapter 6 No changes.

Chapter 7 No changes.

Chapter 8 Pages 8.4-10 thru 8.4-12, modified items 3 and 4 of Section 8.4.3.2; modified items I and 2 of Section 8.4.3.3; deleted item 3 of Section 8.4.3.3 and renumbered the remaining two items; and, deleted item 3 from Section 8.4.3.4.

Chapter 9 No changes.

ED20180025 Page 2 of2

ED20180025 SAR Changed Pages and LOEP NAC-STC SAR, Revision 18A March 2018 Page 1 of 1

ANAC

~I INTERNATIONAL Atlanta Corporate Headquarters: 3950 East Jones Bridge Road, Norcross, Georgia 30092 USA Phone 770-447-1144, Fax 770-447-1797, www.nacintl.com March 2018 Revision 18A

NAC-STC SAR Docket No. 71-9235 March 2018 Revision 18A List of Effective Pages Chapter 1 Page 2.4-1................................ Revision 17 Page 2.4.1-1............................. Revision 17 Pages 1-i thru 1-ii.................... Revision 17 Page 2.4.2-1............................. Revision 17 Pages 1-iii........................... Revision 18A Page 2.4.3-1............................. Revision 17 Pages 1-v............................... Revision 17C Pages 2.4.4-1 thru 2.4.4-6........ Revision 17 Page 1-vi................................. Revision 17 Pages 2.4.4-7 thru 2.4.4-8..... Revision 17C Pages 1-1 thru 1-11................. Revision 17 Page 2.4.4-9............................. Revision 17 Pages 1.1-1 thru 1.1-8............. Revision 17 Page2.4.4-10........................ Revision 17C Page 1.1-4............................. Revision 17C Page 2.4.5-1............................. Revision 17 Pages 1.1-1 thru 1.1-8............. Revision 17 Page 2.4.6-1............................. Revision 17 Pages 1.2-1 thru 1.2-7............. Revision 17 Pages 2.5.1-1 thru 2.5.1-37...... Revision 17 Page 1.2-8............................. Revision 17C Pages 2.5.2-1 thru 2.5.2-29...... Revision 17 Pages 1.2-9 thru 1.2-37........... Revision 17 Pages 2.6-1 thru 2.6-2.............. Revision 17 Pages 1.2-38 thru 1.2-39....... Revision l 7C Pages2.6.1-l thru2.6.J-7........ Revision 17 Pages 1.2-40 thru 1.2-44......... Revision 17 Pages 2.6.2-1 thru 2.6.2-8........ Revision 17 Page 1.3-1............................... Revision 17 Page 2.6.3-1............................. Revision 17 Pages 1.4-1 thru 1.4-24........... Revision 17 Page 2.6.4-1............................. Revision 17 Pages 2.6.5-1 thru 2.6.5-2........ Revision 17 Chapter 2 Page 2.6.6-1............................. Revision 17 Page 2.6.7-1............................. Revision 17 Pages 2-i thru 2-Ixvi................ Revision 17 Pages 2.6.7.1-1 thru Page 2-1.................................. Revision 17 2.6.7.1-17.......................... Revision 17 Pages 2.1.1-1 thru 2.1.1-2....... Revision 17 Pages 2.6.7.2-1 thru Page 2.1.1-3.......................... Revision 17C 2.6.7.2-19.......................... Revision 17 Pages 2.1.1-4 thru 2.1.1-5....... Revision 17 Pages 2.6.7.3-1 thru Pages 2.1.2-1 thru 2.1.2-5....... Revision 17 2.6.7.3-1 I.......................... Revision 17 Pages 2.1.3-1 thru 2.1.3-15..... Revision 17 Pages 2.6.7.4-1 thru Pages 2.2-1 thru 2.2-8............. Revision 17 2.6.7.4-59.......................... Revision 17 Pages 2.3.1-1 thru 2.3.1-2....... Revision 17 Pages 2.6. 7.5-1 thru Pages 2.3.2-1 thru 2.3.2-2....... Revision 17 2.6.7.5-4............................ Revision 17 Page 2.3.2-3.......................... Revision 17B Pages 2.6. 7.5-5 thru Pages 2.3.2-4 thru 2.3.2-5....... Revision 17 2.6.7.5-8......................... Revision 17B Pages 2.3.3-1 thru 2.3.3-2....... Revision 17 Pages 2.6.7.5-9 thru Pages 2.3.4-1 thru 2.3.4-3....... Revision 17 2.6.7.5-13.......................... Revision 17 Pages 2.3.5-1 thru 2.3.5-2....... Revision 17 Pages 2.6. 7.6-1 thru Pages 2.3.6-1 thru 2.3.6-5....... Revision 17 2.6.7.6-13.......................... Revision 17 Page 2.3.7-1............................ Revision 17 Page 2.3.8-1............................ Revision 17 1 of7

NAC-STC SAR Docket No. 71-9235 March 2018 Revision 18A List of Effective Pages (continued)

Pages 2.6.7.7-1 thru Page 2.6.12.12-1...................... Revision 17 2.6.7.7-5........................... Revision 17 Pages 2.6.12.13-1 thru Page 2.6.8-1............................ Revision 17 2.6.12.13-4........................ Revision 17 Page 2.6.9-1............................ Revision 17 Pages 2.6.13-1 thru 2.6.13-3.... Revision 17 Page 2.6.10-1.......................... Revision 17 Pages 2.6.13.1-1 thru Pages 2.6.10.1-1 thru 2.6.13.1-2.......................... Revision 17 2.6.10.1-2......................... Revision 17 Pages 2.6.13.2-1 thru Pages 2.6.10.2-1 thru 2.6.13.2-7.......................... Revision 17 2.6.10.2-4......................... Revision 17 Pages 2.6.13.3-1 thru Pages 2.6.10.3-1 thru 2.6.13.3-4.......................... Revision 17 2.6.10.3-7......................... Revision 17 Pages 2.6.13.4-1 thru Pages 2.6.11-1....................... Revision 17B 2.6.13.4-5.......................... Revision 17 Pages 2.6.11.1-1 thru Pages 2.6.13.5-1 thru 2.6.11.1-4....................... Revision 17B 2.6.13.5-2.......................... Revision 17 Pages 2.6.11.2-1 thru Pages 2.6.13.6-1 thru 2.6.11.2-11..................... Revision 17B 2.6.13.6-2.......................... Revision 17 Page 2.6.11.3-1....................... Revision 17 Pages 2.6.13. 7-1 thru Pages 2.6.12-1 thru 2.6.12-5... Revision 17 2.6.13.7-2.......................... Revision 17 Page 2.6.12.1-1....................... Revision 17 Page 2.6.13.8-1........................ Revision 17 Pages 2.6.12.2-1 thru Page 2.6.13.9-1........................ Revision 17 2.6.12.2-5......................... Revision 17 Page 2.6.13.10-1...................... Revision 17 Pages 2.6.12.3-1 thru Pages 2.6.13.11-1 thru 2.6.12.3-7......................... Revision 17 2.6.13.11-3........................ Revision 17 Pages 2.6.12.4-1 thru Pages 2.6.13.12-1 thru 2.6.12.4-3......................... Revision 17 2.6.13.12-2........................ Revision 17 Pages 2.6.12.5-1 thru Pages 2.6.14-1 thru 2.6.12.5-3......................... Revision 17 2.6.14-8............................. Revision 17 Pages 2.6.12.6-1 thru Pages 2.6.14.1-1 thru 2.6.12.6-2......................... Revision 17 2.6.14.1-2.......................... Revision 17 Pages 2.6.12.7-1 thru Pages 2.6.14.2-1 thru 2.6.12. 7-22....................... Revision 17 2.6.14.2-17........................ Revision 17 Pages 2.6.12.8-1 thru Pages 2.6.14.3-1 thru 2.6.12.8-2......................... Revision 17 2.6.14.3-3.......................... Revision 17 Pages 2.6.12.9-1 thru Pages 2.6.14.4-1 thru 2.6.12.9-11....................... Revision 17 2.6.14.4-4.......................... Revision 17 Page 2.6.12.10-1..................... Revision 17 Pages 2.6.14.5-1 thru Page 2.6.12.11-1..................... Revision 17 2.6.14.5-3.......................... Revision 17 2 of7

NAC-STC SAR Docket No. 71-9235 March 2018 Revision 18A List of Effective Pages (continued)

Page 2.6.14.6-1....................... Revision 17 Pages 2.6.16.3-1 thru Pages 2.6.14.7-1 thru 2.6.16.3-3.......................... Revision 17 2.6.14.7-14....................... Revision 17 Pages 2.6.16.4-1 thru Pages 2.6.14.8-1 thru 2.6.16.4-3.......................... Revision 17 2.6.14.8-6......................... Revision 17 Pages 2.6.16.5-1 thru Page 2.6.14.9-1....................... Revision 17 2.6.15.5-3.......................... Revision 17 Page 2.6.14.10-1..................... Revision 17 Pages 2.6.16.6-1 thru Pages 2.6.14.11-1 thru 2.6.16.6-3.......................... Revision 17 2.6.14.11-5....................... Revision 17 Pages 2.6.16.7-1 thru Pages 2.6.14.12-1 thru 2.6.16.7-12........................ Revision 17 2.6.14.12-5....................... Revision 17 Pages 2.6.16.8-1 thru Page 2.6.15-1.......................... Revision 17 2.6.16.8-7.......................... Revision 17 Pages 2.6.15.1-1 thru Page 2.6.16.9-1........................ Revision 17 2.6.15.1-2......................... Revision 17 Page 2.6.16. l 0-1...................... Revision 17 Pages 2.6.15.2-1 thru Pages 2.6.16.11-1 thru 2.6.15.2-7......................... Revision 17 2.6.16.11-4........................ Revision 17 Pages 2.6.15.3-1 thru Pages 2.6.16.12-1 thru 2.6.15.3-4......................... Revision 17 2.6.16.12-2........................ Revision 17 Pages 2.6.15.4-1 thru Pages 2.6.16.13-1 thru 2.6.15.4-4......................... Revision 17 2.6.16.13-2........................ Revision 17 Page 2.6.15.5-1....................... Revision 17 Page 2.6.16.14-1...................... Revision 17 Pages 2.6.15.6-1 thru Pages 2.6.17-1 thru 2.6.15.6-3......................... Revision 17 2.6.17-13........................... Revision 17 Page 2.6.15.7-1....................... Revision 17 Pages 2.6.18-1 thru Page 2.6.15.8-1....................... Revision 17 2.6.18-6............................. Revision 17 Page 2.6.15.9-1....................... Revision 17 Pages 2.6.19-1 thru Page 2.6.15.10-1..................... Revision 17 2.6.19-23........................... Revision 17 Pages 2.6.15.11-1 thru Pages 2.6.20-1 thru 2.6.15.11-3....................... Revision 17 2.6.20-20........................... Revision 17 Pages 2.6.15.12-1 thru Pages 2.6.21-1 thru 2.6.15.12-2....................... Revision 17 2.6.21.-2............................ Revision 17 Pages 2.6.16-1 thru Pages 2.7-1 thru 2.7-2.............. Revision 17 2.6.16-6............................ Revision 17 Pages 2.7.1-1 thru 2.7.1-2........ Revision 17 Pages 2.6.16.1-1 thru Pages 2.7.1.1-1 thru 2.6.16.1-2......................... Revision 17 2.7.1.1-15.......................... Revision 17 Pages 2.6.16.2-1 thru Pages 2.7.1.2-1 thru 2.6.16.2-11....................... Revision 17 2.7.1.2-15.......................... Revision 17 3 of7

NAC-STC SAR Docket No. 71-9235 March 2018 Revision 18A List of Effective Pages (continued)

Pages 2.7.1.3-1 thru Pages 2.7.8.3-1 thru 2.7.1.3-9........................... Revision 17 2.7.8.3-13.......................... Revision 17 Pages 2. 7.1.4-1 thru Pages 2.7.8.4-1 thru 2.7.1.4-11......................... Revision 17 2.7.8.4-10.......................... Revision 17 Pages 2.7.1.5-1 thru Page 2.7.8.5-1.......................... Revision 17 2.7.1.5-3........................... Revision 17 Pages 2.7.9-1 thru 2.7.9-40...... Revision 17 Pages 2.7.1.6-1 thru Pages 2.7.10-1 thru 2.7.1.6-16......................... Revision 17 2.7.10-12........................... Revision 17 Page 2.7.2-1............................ Revision 17 Pages 2.7.11-1 thru Pages 2.7.2.1-1 thru 2.7.11-16........................... Revision 17

2. 7.2.1-5........................... Revision 17 Pages 2. 7.12-1 thru Pages 2.7.2.2-1 thru 2.7.12-10........................... Revision 17 2.7.2.2-9........................... Revision 17 Pages 2.7.13-1 thru Pages 2.7.2.3-1 thru 2.7.13-4............................. Revision 17 2.7.2.3-6........................... Revision 17 Pages 2.7.13.1-1 thru Pages 2.7.2.4-1 thru 2.7.13.1-18........................ Revision 17 2.7.2.4-7........................... Revision 17 Pages 2.7.13.2-1 thru Page 2.7.2.5-1......................... Revision 17 2.7.13.2-2.......................... Revision 17 Page 2.7.2.6-1......................... Revision 17 Pages 2.7.13.3-1 thru Page 2.7.3.1-1......................... Revision 17 2.7.13.3-4.......................... Revision 17 Pages 2. 7.3.2-1 thru Pages 2.7.13.4-1 thru 2.7.3.2-5........................... Revision 17 2.7.13.4-8.......................... Revision 17 Pages 2.7.3.3-1 thru Pages 2.7.13.5-1 thru 2.7.3.3-3........................... Revision 17 2.7.13.5-2.......................... Revision 17 Pages 2.7.3.4-1 thru Pages 2.7.14-1 thru 2.7.3.4-2........................... Revision 17 2.7.14-13........................... Revision 17 Page 2.7.3.5-1......................... Revision 17 Pages 2. 7.15-1 thru Page 2.7.3.6-1......................... Revision 17 2.7.15-16........................... Revision 17 Page 2.7.4-1............................ Revision 17 Page 2.8-1................................ Revision 17 Page 2.7.5-1............................ Revision 17 Pages 2.9-1 thru 2.9-11............ Revision 17 Page 2.7.6-1............................ Revision 17 Pages 2.10.1-1 thru Pages 2.7.7-1 thru 2.7.7-4....... Revision 17 2.10.1-4............................. Revision 17 Pages 2.7.8-1 thru 2.7.8-4....... Revision 17 Pages 2.10.2-1 thru Pages 2.7.8.1-1 thru 2.10.2-93........................... Revision 17

2. 7.8.1-43......................... Revision 17 Pages 2.10.3-1 thru Pages 2.7.8.2-1 thru 2.10.3-7............................. Revision 17 2.7.8.2-2........................... Revision 17 4 of7

NAC-STC SAR Docket No. 71-9235 March 2018 Revision 18A List of Effective Pages (continued)

Pages 2.10.4-1 thru 2.10.4-288........................ Revision 17 Pages 2.10.5-1 thru 2.10.5-22.......................... Revision 17 Pages 2.10.6-1 thru 2.10.6.-36......................... Revision 17 13 drawings in Sections 2.10.6.6 and 2.10.6.7 Pages 2.10.6-37 thru 2.10.6-88.......................... Revision 17 Pages 2.10.7-1 thru 2.10.7-26.......................... Revision 17 Pages 2.10.8-1 thru 2.10.8-24. Revision 17 Pages 2.10.9-1 thru 2.10.9-11. Revision 17 Pages 2.10.10-1 thru 2.10.10-11........................ Revision 17 Pages 2.10.11-1 thru 2.10.11-8.......................... Revision 17 Pages 2.10.12-1 thru 2.10.12-31........................ Revision 17 4 drawings in Section 2.10.12 Pages 2.11.1-1 thru 2.11.1-2... Revision 17 Pages 2.11.2-1 thru 2.11.2-2... Revision 17 Page 2.11.3-1.......................... Revision 17 Page 2.11.4-1.......................... Revision 17 Page 2.11.5-1.......................... Revision 17 Pages 2.11.6-1 thru 2.11.6-6... Revision 17 Page 2.11.6.12-1 thru 2.11.6.12-62..................... Revision 17 Pages 2.11.6.13-1 thru 2.11.6.13-35..................... Revision 17 Pages 2.11.6.14-1 thru 2.11.6.14-10..................... Revision 17 Page 2.11.6.15-1...................... Revision 17 Pages 2.11.7-1 thru 2.11.7-8.... Revision 17 Pages 2.11.7.8-1 thru 2.11. 7.8-34........................ Revision 17 Pages 2.11.7.9-1 thru 2.11.7.9-14........................ Revision 17 Pages 2.11.7.10-1 thru 2.11.7.10-5........................ Revision 17 Page 2.11.8-1........................... Revision 17 Pages 2.11.9-1 thru 2.11.9-10........................... Revision 17 Chapter 3 Page 3-i................................. Revision 17B Page 3-ii................................... Revision 17 Pages 3-iii thru 3-vi.............. Revision 17B Page 3-vii................................. Revision 17 Pages 3.1-1 thru 3.1-12............ Revision 17 Pages 3.2-1 thru 3.2-14............ Revision 17 Pages 3.3-1 thru 3.3-6.............. Revision 17 Pages 3.4-1 thru 3.4-44............ Revision I 7 Pages 3.4-45 thru 3.4-86....... Revision 17B Pages 3.5-1 thru 3.5-16............ Revision 17 Page 3.6-1................................ Revision 17 Pages 3.6.1-1 thru 3.6.1-4........ Revision 17 Pages 3.6.2-1 thru 3.6.2-3........ Revision 17 Pages 3.6.3-1 thru 3.6.3-3........ Revision 17 Pages 3.6.4-1 thru 3.6.4-24...... Revision I 7 Pages 3.6.5-1 thru 3.6.5-3........ Revision 17 Chapter 4 Pages 4-i thru 4-iii................... Revision 17 Pages 4.1-1 thru 4.1-9.............. Revision 17 Pages 4.2-1 thru 4.2-17............ Revision 17 Pages 4.3-1 thru 4.3-4.............. Revision 17 5 of7

NAC-STC SAR Docket No. 71-9235 March 2018 Revision I SA List of Effective Pages (continued)

Page 4.4-1............................... Revision 17 Pages 6.5.1-1 thru 6.5.1-21...... Revision 17 Pages 4.5-1 thru 4.5-13........... Revision 17 Pages 6.5.2-1 thru 6.5.2-20...... Revision 17 Page 4.5-14........................... Revision 17C Pages 6.6-1 thru 6.6-2.............. Revision 17 Pages 4.5-15 thru 4.5-33......... Revision 17 Pages 6.7-1 thru 6.7-333.......... Revision 17 Pages 4.6-1 thru 4.6-2............. Revision 17 Page 6.8-1................................ Revision 17 Pages 6.8.1-1 thru 6.8.1-6........ Revision 17 Chapter 5 Pages 6.8.2-1 thru 6.8.2-2........ Revision 17 Pages 6.8.3-1 thru 6.8.3-20...... Revision 17 Pages 5-i thru 5-xiii................. Revision 17 Pages 6.8.4-1 thru 6.8.4-34...... Revision 17 Pages 5-1 thru 5-3................... Revision 17 Pages 6.8.5-1 thru 6.8.5-34...... Revision 17 Pages 5.1-1 thru 5.1-30........... Revision 17 Page 6.8.6-1............................. Revision 17 Pages 5.2-1 thru 5.2-40........... Revision 17 Pages 6.8.7-1 thru 6.8.7-25...... Revision 17 Pages 5.3-1 thru 5.3-33........... Revision 17 Pages 5.4-1 thru 5.4-3............. Revision 17 Chapter 7 Page 5.4-4............................. Revision 17C Pages 5.4-5 thru 5.4-41........... Revision 17 Pages 7-i thru 7-ii.................... Revision 17 Pages 5.5-1 thru 5.5-61........... Revision 17 Pages 7-1 thru 7-3.................... Revision 17 Page 5.6-1............................... Revision 17 Pages 7.1-1 thru 7.1-13............ Revision 17 Pages 5.6.1-1 thru 5.6.1-9....... Revision 17 Pages 7.2-1 thru 7.2-5.............. Revision 17 Pages 5.6.2-1 thru 5.6.2-20..... Revision 17 Pages 7.3-1 thru 7.3-9.............. Revision 17 Pages 5.6.3-1 thru 5.6.3-13..... Revision 17 Pages 7.4-1 thru 7.4-4.............. Revision 17 Pages 5.6.4-1 thru 5.6.4-34..... Revision 17 Page 7.5-1................................ Revision 17 Page 5.6.5-1............................ Revision 17 Pages 7.6-1 thru 7.6-5.............. Revision 17 Pages 5.6.6-1 thru 5.6.6-57..... Revision 17 Chapter 6 Chapter 8 Pages 6-i thru 6-ix................... Revision 17 Page 8-i thru 8-ii................... Revision 17B Pages 6.1-1 thru 6.1-6............. Revision 17 Page 8-1................................... Revision 17 Pages 6.2-1 thru 6.2-11........... Revision 17 Pages 8.1-1 thru 8.1-5.............. Revision 17 Pages 6.3-1 thru 6.3-10........... Revision 17 Page 8.1-6............................. Revision 17C Pages 6.4-1 thru 6.4-2............. Revision 17 Pages 8.1-7 thru 8.1-8.............. Revision 17 Page 6.4.1-1............................ Revision 17 Pages 8.1-9 thru 8.1-10......... Revision 17C Pages 6.4.2-1 thru 6.4.2-9....... Revision 17 Pages 8.1-11 thru 8.1-12....... Revision 17B Pages 6.4.3-1 thru 6.4.3-29..... Revision 17 Pages 8.1-13 thru 8.1-24.......... Revision 17 Pages 6.4.4-1 thru 6.4.4-30..... Revision 17 Pages 8.2-1 thru 8.2-2.............. Revision 17 Pages 6.5-1 thru 6.5-2............. Revision 17 Pages 8.2-3 thru 8.2-6........... Revision 17B 6 of7

NAC-STC SAR Docket No. 71-9235 List of Effective Pages (continued)

Pages 8.2-7 thru 8.2-8............. Revision 17 Page 8.3-1............................... Revision 17 Pages 8.4-1 thru 8.4-3........... Revision l 7C Page 8.4-4............................... Revision 17 Pages 8.4-5 thru 8.4-9........... Revision 17B Pages 8.4-10 thru 8.4-12...... Revision ISA Pages 8.4-11 thru 8.4-14....... Revision 17B Chapter 9 Page 9-i................................... Revision 17 Pages 9-1 thru 9-13................. Revision 17 7 of7 March 2018 Revision 18A

NAC-STC SAR Docket No. 71-9235 Drawing Number 423-800, sheets 1-3 423-800, sheets 1-3 423-802, sheets I-7 423-803, sheets 1-2 423-804, sheets 1-3 423-805, sheets 1-2 423-806, sheets 1-2 423-807, sheets 1-3 423-209 423-210 423-257 423-258 423-811, sheets 1-2 423-812 423-843 423-859 423-870 423-871 423-872 423-873 423-874 423-875, sheets 1-2 423-878, sheets 1 -2 423-880 423-880 423-900 423-901 455-800, sheets 1-2 Revision No.

Rev 19p<1l Rev I9NP<1l Rev 25 Revl4 Rev 12 Rev 8 Rev 13 Rev 5 Rev 1 Rev 1 Rev 3 Rev 3 Rev 13 Rev 7 Rev 6 Rev 1 Rev 7 Rev 5 Rev 6 Rev 2 Rev 3 Rev 11 Rev 5 Rev 2p<1l Rev 1NP<1l Rev 8 Rev 3 Rev 2 List of Drawings Title Cask Assembly - NAC-STC Cask Cask Assembly - NAC-STC Cask Cask Body - NAC-STC Cask Lid Assembly - Inner, NAC-STC Cask Details - Inner Lid, NAC-STC Cask Lid Assembly - Outer, NAC-STC Cask March 2018 Revision 18A Po1i Coverplate Assy - Inner Lid, NAC-STC Cask Assembly, Port Cover, NAC-STC Cask Impact Limiter Assy - Upper, NAC-STC Cask Impact Limiter Assy - Lower, NAC-STC Cask Balsa Impact Limiter, Upper, NAC-STC Cask Balsa Impact Limiter, Lower, NAC-STC Cask Details - NAC-STC Cask Nameplates - NAC-STC Cask Transport Assembly, Balsa Impact Limiters, NAC-STC Attachment Hardware, Balsa Limiters, NAC-STC Fuel Basket Assembly, PWR, 26 Element, NAC-STC Cask Bottom Weldment, Fuel Basket, PWR, 26 Element, NAC-STC Cask Top Weldment, Fuel Basket, PWR, 26 Element, NAC-

. STC Cask Support Disk and Misc. Basket Details, PWR, 26 Element, NAC-STC Cask Heat Transfer Disk, Fuel Basket, PWR, 26 Element, NAC-STC Cask Tube, NAC-STC Cask Alternate Tube Assembly, NAC-STC Cask Shielded Thermal Shunt Assembly, NAC-STC Cask Shielded Thermal Shunt Assembly, NAC-STC Cask Package Assembly Transportation, NAC-STC Cask Transportation Package Concept, NAC-STC Cask Assembly, Transport Cask, MPC-Yankee

( l) Proprietary and Non-proprietary drawing versions are only included in their respective SAR versions.

1-iii

NAC-STC SAR Docket No. 71-9235 Drawing Number 455-801, sheets 1-2 455-820, sheets 1-2 455-870 455-871, sheets 1-2 455-871, sheets 1-3 455-872, sheets 1-2 455-872, sheets 1-2 455-873 455-881, sheets 1-3 455-887, sheets 1-3 455-888, sheets 1-2 455-891, sheets 1-2 455-891, sheets 1-3 455-892, sheets 1-2 455-892, sheets 1-3 455-893 455-894 455-895, sheets 1-2 455-895, sheets 1-2 455-919 414-801, sheets 1-2 414-820 414-870 414-871, sheets 1-2 414-872, sheets 1-3 414-873 414-874 414-875 414-881, sheets 1-2 414-882, sheets 1-2 September 2017 Revision I 7C List of Drawings (continued)

Revision No.

Title Rev4 Assembly, Transport Cask, NAC-MPC Rev 3 Spacers, Transport Cask, MPC-Yankee Rev 5 Canister Shell, MPC-Yankee Rev 8 Details, Canister, MPC-Yankee Rev 7P2 Details, Canister, MPC-Yankee Rev 12 Assembly, Transportable Storage Canister (TSC),

MPC-Yankee Rev l lPl Assembly, Transp01iable Storage Canister (TSC),

MPC-Yankee Rev4 Assembly, Drain Tube, Canister, MPC-Yankee Rev 8 PWR Fuel Tube, MPC-Yankee Rev 4 Basket Assembly, 24 GTCC Container, MPC-Yankee Rev 8 Assembly, Transportable Storage Canister (TSC), 24 GTCC Container, MPC-Yankee Rev 1 Bottom Weldment, Fuel Basket, MPC-Yankee Rev 2PO Bottom Weldment, Fuel Basket, MPC-Yankee Rev 3 Top Weldment, Fuel Basket, MPC-Yankee Rev 3PO Top Weldment, Fuel Basket, MPC-Yankee Rev 3 Support Disk and Misc. Basket Details, MPC-Yankee Rev 2 Heat Transfer Disk, Fuel Basket, MPC-Y ankee Rev 5 Fuel Basket Assembly, MPC-Yankee Rev 5PO Fuel Basket Assembly, MPC-Yankee Rev 2 Retainer, United Nuclear Test Assy, MPC-Yankee Rev2 Cask Assembly, NAC-STC, CY-MPC Rev 0 Canister Spacer CY-MPC Rev 3 Canister Shell, CY-MPC Rev 6 Details, Canister CY-MPC Rev 6 Assembly, Transpo1iable Storage Canister (TSC),

CY-MPC Rev 2 Drain Tube Assembly, CY-MPC Rev 0 Shim, Canister, CY-MPC Rev 0 Spacer Shim, Canister, CY-MPC Rev4 Fuel Tube, Transportable Storage Canister (TSC),

CY-MPC Rev 4 Oversize Fuel Tube, Transportable Storage Canister (TSC), CY-MPC 1-iv

The following drawings have been withheld as Sensitive Unclassified Non-Safeguards Information-Security-Related Information:

Drawing Nos 423-802, Sheets 1 through 7, Revision 25 Drawing 423-209, Revision 1 Drawing 423-210, Revision 1 Drawing 423-257, Revision 3 Drawing 423-258, Revision 3

NAC-STC SAR Docket No. 71-9235 June 2017 Revision 17B 8.4.3.]

Preparation for Lead Pour The following activities must be completed m preparation for pouring of the lead m the NAC-STC cask body:

1.

Temporary stiffener bars/rings are installed inside the body weldment at intermittent locations along the cask length. Optional stiffener bars/rings may be installed on the outside of the body weldment at intermittent locations along the cask length. The stiffeners support the shells during the lead pour and cooldown in order to maintain the specified dimensions of the lead annulus. The stiffeners are removed after the cooldown operation is completed.

2.

Pairs of thermocouples are used to monitor the heating and cooling cycle of the inner and outer shells. Each pair of thermocouples is positioned at approximately the same radial and axial location, one on the inside diameter of the inner shell and one on the outside diameter of the outer shell. The exact number of pairs shall be determined prior to the lead pour.

3.

Heaters are installed in the cask cavity for use in heating the inner shell. Typical heaters include but are not limited to electric, gas, etc.

4.

The body weldment (Section 8.4.1) of the NAC-STC is inverted and supported in a stable, ve1tical position within a structure that provides a basically draft-free operational area.

5.

An auxiliary dam extension and supports are welded to the open end of the outer shell. The extension and supports permit the full length of the lead shell to be poured in one operation while maintaining the annulus spacing at the open end of the outer shell.

6.

Heating/water cooling systems are installed around the outside of the body weldment for use in heating, and later in cooling, the outer shell. A heating system is also used on the outside surface of the bottom inner forging. Heating methods include but are not limited to electric, gas, etc.

Cooling methods include but are not limited to cooling rings, cooling shells, etc. encompassing the inner and outer shells.

8.4-9

NAC-STC SAR Docket No. 71-9235 March 2018 Revision 1 SA 8.4.3.2

7.

The body weldment surfaces, especially the lead annulus, are checked for dimensional accuracy to ensure that the required spacing has been maintained and for cleanliness to ensure that no foreign materials are present.

8.

The typical general arrangement of the equipment for the alternate method lead pour operation is shown in Figure 8.4-2.

Lead Pour Operations The requirements and activities that must be completed during the pouring of the lead in the NAC-STC cask body are:

1. The lead material certification is checked to ensure that it conforms to the requirements of the American Society of Testing Materials (ASTM) B29, Chemical Copper Grade - 99.90 percent pure.

2.

Approximately 60,000 pounds of lead is placed in appropriate size kettles and melted.

During the lead pouring operations the temperature of the molten lead is maintained above a sufficient temperature to conduct the pour but below 790°F ( 421 °C).

3.

At the same time that the lead is being melted, the NAC-STC body weldment is simultaneously heated on both the interior and exterior. The body weldment will be heated in a steady, uniform, and controlled manner at a rate not exceeding 125°F/hour (69.4°C/hour). A heating system is also used to heat the exterior of the bottom inner forging. The surface temperature of the body weldment is never permitted to exceed 800°F ( 427°C). The temperature of the entire body weldment is maintained between 640°F (338°C) and 740°F (393°C) throughout the lead pour operations.

4.

The lead pour is initiated after the temperatures of the lead and the body weldment are stabilized, as previously described. The actual pouring of the lead is completed without interruption and in as sho11 a period of time as possible. During the lead pour the bottom end of the filler-tube is kept below the surface of the molten lead to preclude the formation of voids in the lead.

8.4-10

NAC-STC SAR Docket No. 71-9235 March 2018 Revision 18A 8.4.3.3

5.

The lead is poured to a level that is sufficient to ensure that dross removal and contraction during solidification do not reduce the finished surface below the required level. A long steel rod inserted into the molten lead annulus is used to ensure that no solidification has begun anywhere in the volume of molten lead.

Cooldown Following Lead Pour The procedures and requirements that must be completed during cooldown of the NAC-STC body weldment following completion of the lead pour are as follows:

8.4.3.4

1.

Cooldown is initiated by turning off the interior and exterior heaters at the lowest end of the cask (in the as-poured position). A water tank cooling system is then used to facilitate and control cooling.

As cask cooling proceeds, effected by raising the cooling system water level, the heaters upward along the cask are successively turned off, ensuring the head of lead during cooling remains in the molten state.

2.

The cooldown process is temperature controlled to maintain approximately uniform solidification conditions across the thickness and around the circumference of the annulus. This is maintained by controlling both the minimum inlet water temperature and the rate in which the water level is increased. The maximum water level rate of increase shall be no greater than 23.62 inches (600mm)/hr and the minimum inlet water temperature shall be greater than 45°F (7°C). Overall cooling rate(s) should be controlled by lead solidification measurements described below in Step 3 below.

3.

The solidification level in the lead annulus is checked with the aid of a long steel rod in order to verify there is no significant difference in solid surface between the inside and outside of the annulus.

4.

Dross is skimmed off the top of the lead while maintaining the molten head throughout the cooldown process.

Lead Pour Documentation The following data is included in the Data Package for the Lead Pour Operation:

8.4-11

NAC-STC SAR Docket No. 71-9235 8.4.3.4 Lead Pour Documentation The following data is included in the Data Package for the Lead Pour Operation:

1.

Ce1iificate of Chemical Analysis of the lead.

2.

Heating and cooling charts showing elapsed time and temperatures.

8.4-12 March 2018 Revision 1 8A *