ML19204A244

Enclosure 3 to DPG-19-087 - RAI Clarifications and Responses (Non-Proprietary)

ML19204A244
Person / Time
Site:	07200011
Issue date:	07/12/2019
From:	Sacramento Municipal Utility District (SMUD)
To:	Office of Nuclear Material Safety and Safeguards
Shared Package
ML19204A239	List: ML19204A241 ML19204A242 ML19204A244 ML19204A248 ML19204A251
References
CAC 000993, CAC 001028, DPG 19-087, EPID: L-2018-LNE-0004, EPID: L-2018-RNW-0005
Download: ML19204A244 (21)

Text

RAI Clarifications and Responses - Public to DPG-19-087 Page 1 of 21 Chapter 2 - Scoping Evaluation RAI 2-1 clarification:

The staff noted the following regarding information provided in the two cross-matrix tables and additional clarification items identified in Table RAI 2-1-3. Table RAI 2-1-3 was provided in response to RAI 2-1.

1. Drawings NUH-05-1022-FO1 through NUH-05-1025-FO1 listed in the first note at the end of LRA Table 2-6 have not been provided to the NRC. Please provide the drawings.

2. Drawing NUH-05-1053-FC1 Item 2 "Lead Shielding" for the basket assembly is not included in Table 2-6. This SSC seems to be identical to Drawing NUH-05-4004 Item 3 or Drawing NUH-05-1051-FC1 Item 3 "Lead Shielding" for shell assembly in Table RAI 2-1-1. Please clarify.

3. Table RAI 2-1-1 lists drawing NUH-05-1031-FF1 Item 4 "Outer Support Plate" which appears to be incorrect. This SSC should be Drawing NUH-05-1031-FF1 Item 3 "Support Plate". Please clarify.

The information requested in RAI 2-1 is needed to determine compliance with 10 CFR 72.24(c) and 72.42(a).

Response to RAI 2-1 clarification:

For general information, note that certain UFSAR drawings, such as NUH-05-4004, did not include component safety classifications and therefore the supporting design drawings, such as NUH-05-1053-FC1, were used to identify the safety classifications. In cases where neither the UFSAR nor the design drawing included the safety classification, a quality category assessment was used to establish the safety class.

Item No. 1 Drawings NUH-05-1022-FO1 through NUH-05-1025-FO1 are provided in Enclosure 6.

Additionally, because the safety classification for UFSAR drawing NUH-05-4004 Item No. 14, "Neutron Absorber Sheet," is not shown on that UFSAR drawing or any design drawings for the FO or FC DSC designs, Quality Category Assessment No. NUH-05-103.01 is provided in as well. LRA Table 2-6 Notes 1 and 2 have been updated in this regard.

RAI Clarifications and Responses - Public to DPG-19-087 Page 2 of 21 Item No. 2 Item No. 2 on design drawing NUH-05-1053-FC1 identifies the lead shielding in the top shield plug of the FC DSC. UFSAR drawing NUH-05-4004 Item No. 3 identifies the lead shielding used in the top shield plug as well as the bottom shield plug in the FC DSC (see Sections D and F on sheet 4 of 5 of Drawing NUH-05-4004). Item No. 3 on design drawing NUH-05-1051-FC1 identifies the lead shielding in the bottom shield plug. Therefore, Item No. 3 of drawing NUH 4004 is the same subcomponent as Item No. 2 on drawing NUH-05-1053-FC1 and Item No. 3 on Drawing NUH-05-1051-FC1. LRA Table 2-6 lists all the subcomponents that are listed on the UFSAR drawings, e.g., NUH-05-4004. Therefore, the component identified as Item No. 2 on drawing NUH-05-1053-FC1 is included in LRA Table 2-6 as Item No. 3 on drawing NUH 4004.

As additional clarification, Table RAI 2-1-1 and Table RAI 2-1-2 have been revised to show 1) the safety classification for each UFSAR drawing subcomponent, and 2) if the UFSAR drawing subcomponent represents more than one part on the drawings used to identify the safety classification.

Item No. 3 The item number on the drawing used to identify the safety classification of the Outer Support Plate (Item No. 10 on UFSAR Drawing NUH-05-4005) listed in Table RAI-2-1-1 has been corrected. The source of the safety classification for Item No. 10 on drawing NUH-05-4005 is Item No. 3 on design Drawing NUH-05-1031-FF1.

Impact:

LRA Table 2-6 has been revised as described in the response.

Revised Table RAI 2-1-1 and Table RAI 2-1-2 are shown below.

RAI Clarifications and Responses - Public to DPG-19-087 Page 3 of 21 Table RAI 2-1-1 DSC Safety Classification Cross-Matrix UFSAR Drawings Safety Classification Information Dwg No.

Rev Component Item No.

Sub-component Classification Dwg No.

Rev.

Item No.

NUH-05-4004 16 NUHOMS-FO DSC 1

Cylindrical Shell NUH-05-1021-FO1 0

1 NUH-05-4004 16 NUHOMS-FO DSC 2

Outer Bottom Cover NUH-05-1021-FO1 0

2 NUH-05-4004 16 NUHOMS-FO DSC 3

{Not Used}

N/A N/A N/A NUH-05-4004 16 NUHOMS-FO DSC 4

Grapple Ring NUH-05-1021-FO1 0

4 NUH-05-4004 16 NUHOMS-FO DSC 5

Grapple Ring Support NUH-05-1021-FO1 0

5 NUH-05-4004 16 NUHOMS-FO DSC 6

Inner Bottom Cover NUH-05-1021-FO1 0

6 NUH-05-4004 16 NUHOMS-FO DSC 7

{Not Used}

N/A N/A N/A NUH-05-4004 16 NUHOMS-FO DSC 8

{Not Used}

N/A N/A N/A NUH-05-4004 16 NUHOMS-FO DSC 9

Spacer Disc Type C NUH-05-1020-FO1 0

3 NUH-05-4004 16 NUHOMS-FO DSC 10 Spacer Disc Type A NUH-05-1020-FO1 0

1 NUH-05-4004 16 NUHOMS-FO DSC 11 Guide Sleeve NUH-05-1024-FO1 NUH-05-1025-FO1 0

1 NUH-05-4004 16 NUHOMS-FO DSC 12 Oversleeve NUH-05-1024-FO1 NUH-05-1025-FO1 0

3 NUH-05-4004 16 NUHOMS-FO DSC 13 Spacer Disc Type B NUH-05-1020-FO1 0

2 NUH-05-4004 16 NUHOMS-FO DSC 14 Neutron Absorber Sheet NUH-05-103-01 2

N/A NUH-05-4004 16 NUHOMS-FO DSC 15

{Not Used}

N/A N/A N/A NUH-05-4004 16 NUHOMS-FO DSC 16 Support Rod NUH-05-1020-FO1 0

15 (16)(1)

NUH-05-4004 16 NUHOMS-FO DSC 17 Shear Key NUH-05-1021-FO1 0

7 NUH-05-4004 16 NUHOMS-FO DSC 18 Extension Plate NUH-05-1024-FO1 NUH-05-1025-FO1 0

5 NUH-05-4004 16 NUHOMS-FO DSC 19 Key NUH-05-1022-FO1 0

3 NUH-05-4004 16 NUHOMS-FO DSC 20 Siphon & Vent Block NUH-05-1022-FO1 0

4 NUH-05-4004 16 NUHOMS-FO DSC 21 Siphon Tubing NUH-05-1022-FO1 0

5 NUH-05-4004 16 NUHOMS-FO DSC 22 Male Connector NUH-05-1022-FO1 0

6 NUH-05-4004 16 NUHOMS-FO DSC 23 Quick Connect, 1/2" Male NUH-05-1022-FO1 0

7 NUH-05-4004 16 NUHOMS-FO DSC 24 Lifting Lug NUH-05-1022-FO1 0

8 NUH-05-4004 16 NUHOMS-FO DSC 25 Support Ring NUH-05-1022-FO1 0

9 NUH-05-4004 16 NUHOMS-FO DSC 26 Top Shield Plug NUH-05-1023-FO1 0

2 NUH-05-4004 16 NUHOMS-FO DSC 27 Bottom Shield Plug NUH-05-1021-FO1 0

3

RAI Clarifications and Responses - Public to DPG-19-087 Page 4 of 21 Table RAI 2-1-1 DSC Safety Classification Cross-Matrix UFSAR Drawings Safety Classification Information Dwg No.

Rev Component Item No.

Sub-component Classification Dwg No.

Rev.

Item No.

NUH-05-4004 16 NUHOMS-FO DSC 28 Inner Top Cover Plate NUH-05-1023-FO1 0

5 NUH-05-4004 16 NUHOMS-FO DSC 29 Outer Top Cover Plate NUH-05-1023-FO1 0

3 NUH-05-4004 16 NUHOMS-FO DSC 30 Siphon & Vent Port Cover Plate NUH-05-1023-FO1 0

4 NUH-05-4004 16 NUHOMS-FO DSC 31

{Not Used}

N/A N/A N/A NUH-05-4004 16 NUHOMS-FO DSC 32

{Not Used}

N/A N/A N/A NUH-05-4004 16 NUHOMS-FO DSC 33

{Not Used}

N/A N/A N/A NUH-05-4004 16 NUHOMS-FO DSC 34

{Not Used}

N/A N/A N/A NUH-05-4004 16 NUHOMS-FO DSC 35

{Not Used}

N/A N/A N/A NUH-05-4004 16 NUHOMS-FO DSC 36

{Not Used}

N/A N/A N/A NUH-05-4004 16 NUHOMS-FO DSC 37 Top End Spacer Sleeve NUH-05-1020-FO1 0

7 NUH-05-4004 16 NUHOMS-FO DSC 38 Bottom End Spacer Sleeve NUH-05-1020-FO1 0

14 NUH-05-4004 16 NUHOMS-FO DSC 39 Spacer Sleeve Type 1 NUH-05-1020-FO1 0

8 NUH-05-4004 16 NUHOMS-FO DSC 40 Spacer Sleeve Type 2 NUH-05-1020-FO1 0

9 NUH-05-4004 16 NUHOMS-FO DSC 41 Spacer Sleeve Type 3 NUH-05-1020-FO1 0

10 NUH-05-4004 16 NUHOMS-FO DSC 42 Spacer Sleeve Type 4 NUH-05-1020-FO1 0

11 NUH-05-4004 16 NUHOMS-FO DSC 43 Spacer Sleeve Type 5 NUH-05-1020-FO1 0

12 NUH-05-4004 16 NUHOMS-FO DSC 44 Spacer Sleeve Type 6 NUH-05-1020-FO1 0

13 NUH-05-4004 16 NUHOMS-FO DSC 45

{Not Used}

N/A N/A N/A NUH-05-4004 16 NUHOMS-FO DSC 46

{Not Used}

N/A N/A N/A NUH-05-4004 16 NUHOMS-FO DSC 47 Stop Plate NUH-05-1020-FO1 0

6 NUH-05-4004 16 NUHOMS-FO DSC 48 Plate, 0.085 Thk NUH-05-1024-FO1 NUH-05-1025-FO1 0

4 NUH-05-4004 16 NUHOMS-FO DSC 49

{Not Used}

N/A N/A N/A NUH-05-4004 16 NUHOMS-FO DSC 50

{Not Used}

N/A N/A N/A NUH-05-4004 16 NUHOMS-FO DSC 51

{Not Used}

N/A N/A N/A NUH-05-4004 16 NUHOMS-FO DSC 52

{Not Used}

N/A N/A N/A NUH-05-4004 16 NUHOMS-FC DSC 1

Cylindrical Shell NUH-05-1051-FC1 0

1 NUH-05-4004 16 NUHOMS-FC DSC 2

Outer Bottom Cover NUH-05-1051-FC1 0

2

RAI Clarifications and Responses - Public to DPG-19-087 Page 5 of 21 Table RAI 2-1-1 DSC Safety Classification Cross-Matrix UFSAR Drawings Safety Classification Information Dwg No.

Rev Component Item No.

Sub-component Classification Dwg No.

Rev.

Item No.

NUH-05-4004 16 NUHOMS-FC DSC 3

Lead Shielding NUH-05-1051-FC1 NUH-05-1053-FC1 0

3 2

NUH-05-4004 16 NUHOMS-FC DSC 4

Grapple Ring NUH-05-1051-FC1 0

4 NUH-05-4004 16 NUHOMS-FC DSC 5

Grapple Ring Support NUH-05-1051-FC1 0

5 NUH-05-4004 16 NUHOMS-FC DSC 6

Inner Bottom Cover NUH-05-1051-FC1 0

6 NUH-05-4004 16 NUHOMS-FC DSC 7

Bottom Plug Post NUH-05-1051-FC1 0

7 NUH-05-4004 16 NUHOMS-FC DSC 8

{Not Used}

N/A N/A N/A NUH-05-4004 16 NUHOMS-FC DSC 9

Spacer Disc Type C NUH-05-1050-FC1 0

3 NUH-05-4004 16 NUHOMS-FC DSC 10 Spacer Disc Type A NUH-05-1050-FC1 0

1 NUH-05-4004 16 NUHOMS-FC DSC 11 Guide Sleeve NUH-05-1054-FC1 NUH-05-1055-FC1 0

1 NUH-05-4004 16 NUHOMS-FC DSC 12 Oversleeve NUH-05-1054-FC1 NUH-05-1055-FC1 0

3 NUH-05-4004 16 NUHOMS-FC DSC 13 Spacer Disc Type B NUH-05-1050-FC1 0

2 NUH-05-4004 16 NUHOMS-FC DSC 14 Neutron Absorber Sheet NUH-05-103-01 2

N/A NUH-05-4004 16 NUHOMS-FC DSC 15

{Not Used}

N/A N/A N/A NUH-05-4004 16 NUHOMS-FC DSC 16 Support Rod NUH-05-1050-FC1 0

15 (16)(1)

NUH-05-4004 16 NUHOMS-FC DSC 17 Shear Key NUH-05-1051-FC1 0

13 NUH-05-4004 16 NUHOMS-FC DSC 18 Extension Plate NUH-05-1054-FC1 NUH-05-1055-FC1 0

7 NUH-05-4004 16 NUHOMS-FC DSC 19 Key NUH-05-1052-FC1 0

3 NUH-05-4004 16 NUHOMS-FC DSC 20 Siphon & Vent Block NUH-05-1052-FC1 0

4 NUH-05-4004 16 NUHOMS-FC DSC 21 Siphon Tubing NUH-05-1052-FC1 0

5 NUH-05-4004 16 NUHOMS-FC DSC 22 Male Connector NUH-05-1052-FC1 0

6 NUH-05-4004 16 NUHOMS-FC DSC 23 Quick Connect, 1/2" Male NUH-05-1052-FC1 0

7 NUH-05-4004 16 NUHOMS-FC DSC 24 Lifting Lug NUH-05-1052-FC1 0

8 NUH-05-4004 16 NUHOMS-FC DSC 25 Support Ring NUH-05-1052-FC1 0

9 NUH-05-4004 16 NUHOMS-FC DSC 26

{Not Used}

N/A N/A N/A NUH-05-4004 16 NUHOMS-FC DSC 27

{Not Used}

N/A N/A N/A NUH-05-4004 16 NUHOMS-FC DSC 28 Inner Top Cover Plate NUH-05-1053-FC1 0

5 NUH-05-4004 16 NUHOMS-FC DSC 29 Outer Top Cover Plate NUH-05-1053-FC1 0

3

RAI Clarifications and Responses - Public to DPG-19-087 Page 6 of 21 Table RAI 2-1-1 DSC Safety Classification Cross-Matrix UFSAR Drawings Safety Classification Information Dwg No.

Rev Component Item No.

Sub-component Classification Dwg No.

Rev.

Item No.

NUH-05-4004 16 NUHOMS-FC DSC 30 Siphon & Vent Port Cover Plate NUH-05-1053-FC1 0

4 NUH-05-4004 16 NUHOMS-FC DSC 31 Top Plug Bottom Casing NUH-05-1053-FC1 0

6 NUH-05-4004 16 NUHOMS-FC DSC 32 Top Plug Side Casing NUH-05-1053-FC1 0

7 NUH-05-4004 16 NUHOMS-FC DSC 33 Top Plug Top Casing NUH-05-1053-FC1 0

8 NUH-05-4004 16 NUHOMS-FC DSC 34 Top Plug Lifting Post NUH-05-1053-FC1 0

9 NUH-05-4004 16 NUHOMS-FC DSC 35

{Not Used}

N/A N/A N/A NUH-05-4004 16 NUHOMS-FC DSC 36

Plate, Stiffening NUH-05-1053-FC1 0

10,11 NUH-05-4004 16 NUHOMS-FC DSC 37 Top End Spacer Sleeve NUH-05-1050-FC1 0

7 NUH-05-4004 16 NUHOMS-FC DSC 38 Bottom End Spacer Sleeve NUH-05-1050-FC1 0

14 NUH-05-4004 16 NUHOMS-FC DSC 39 Spacer Sleeve Type 1 NUH-05-1050-FC1 0

8 NUH-05-4004 16 NUHOMS-FC DSC 40 Spacer Sleeve Type 2 NUH-05-1050-FC1 0

9 NUH-05-4004 16 NUHOMS-FC DSC 41 Spacer Sleeve Type 3 NUH-05-1050-FC1 0

10 NUH-05-4004 16 NUHOMS-FC DSC 42 Spacer Sleeve Type 4 NUH-05-1050-FC1 0

11 NUH-05-4004 16 NUHOMS-FC DSC 43 Spacer Sleeve Type 5 NUH-05-1050-FC1 0

12 NUH-05-4004 16 NUHOMS-FC DSC 44 Spacer Sleeve Type 6 NUH-05-1050-FC1 0

13 NUH-05-4004 16 NUHOMS-FC DSC 45 Angle, 1-1/4 x 1-1/4 x 1/4 NUH-05-1054-FC1 NUH-05-1055-FC1 0

4 NUH-05-4004 16 NUHOMS-FC DSC 46 Plate. 1.25 x 1.25 x 1/4 NUH-05-1054-FC1 NUH-05-1055-FC1 0

5 NUH-05-4004 16 NUHOMS-FC DSC 47 Stop Plate NUH-05-1050-FC1 0

6 NUH-05-4004 16 NUHOMS-FC DSC 48 Plate, 0.085 Thk NUH-05-1054-FC1 NUH-05-1055-FC1 0

6 NUH-05-4004 16 NUHOMS-FC DSC 49 Bottom Plug Top Casing NUH-05-1051-FC1 0

8 NUH-05-4004 16 NUHOMS-FC DSC 50 Bottom Plug Side Casing NUH-05-1051-FC1 0

11 NUH-05-4004 16 NUHOMS-FC DSC 51

Plate, Stiffening NUH-05-1051-FC1 0

9, 10 NUH-05-4004 16 NUHOMS-FC DSC 52 Plate NUH-05-1051-FC1 0

12 NUH-05-4005 14 NUHOMS-FF DSC 1

Cylindrical Shell NUH-05-1032-FF1 0

1, 14 NUH-05-4005 14 NUHOMS-FF DSC 2

Outer Bottom Cover NUH-05-1032-FF1 0

2 NUH-05-4005 14 NUHOMS-FF DSC 3

Key NUH-05-1033-FF1 0

9 NUH-05-4005 14 NUHOMS-FF DSC 4

Grapple Ring NUH-05-1032-FF1 0

4

RAI Clarifications and Responses - Public to DPG-19-087 Page 7 of 21 Table RAI 2-1-1 DSC Safety Classification Cross-Matrix UFSAR Drawings Safety Classification Information Dwg No.

Rev Component Item No.

Sub-component Classification Dwg No.

Rev.

Item No.

NUH-05-4005 14 NUHOMS-FF DSC 5

Grapple Ring Support NUH-05-1032-FF1 0

5 NUH-05-4005 14 NUHOMS-FF DSC 6

Inner Bottom Cover NUH-05-1032-FF1 0

6 NUH-05-4005 14 NUHOMS-FF DSC 7

Spacer Disc NUH-05-1031-FF1 0

1 NUH-05-4005 14 NUHOMS-FF DSC 8

Top Spacer Disc NUH-05-1031-FF1 0

2 NUH-05-4005 14 NUHOMS-FF DSC 9

Inner Support Plate NUH-05-1031-FF1 0

3 NUH-05-4005 14 NUHOMS-FF DSC 10 Outer Support Plate NUH-05-1031-FF1 0

3 NUH-05-4005 14 NUHOMS-FF DSC 11 Lead Shielding NUH-05-1032-FF1 NUH-05-1034-FF1 0

3 NUH-05-4005 14 NUHOMS-FF DSC 12 Bottom Plug Post NUH-05-1032-FF1 0

7 NUH-05-4005 14 NUHOMS-FF DSC 13

{Not Used}

N/A N/A N/A NUH-05-4005 14 NUHOMS-FF DSC 14

{Not Used}

N/A N/A N/A NUH-05-4005 14 NUHOMS-FF DSC 15 Siphon & Vent Block NUH-05-1033-FF1 0

4 NUH-05-4005 14 NUHOMS-FF DSC 16 Siphon Tubing NUH-05-1033-FF1 0

5 NUH-05-4005 14 NUHOMS-FF DSC 17 Male Connector NUH-05-1033-FF1 0

6 NUH-05-4005 14 NUHOMS-FF DSC 18 Quick Connect, 1/2" Male NUH-05-1033-FF1 0

7 NUH-05-4005 14 NUHOMS-FF DSC 19 Lifting Lug NUH-05-1033-FF1 0

3 NUH-05-4005 14 NUHOMS-FF DSC 20 Support Ring NUH-05-1033-FF1 0

8 NUH-05-4005 14 NUHOMS-FF DSC 21 Inner Top Cover Plate NUH-05-1034-FF1 0

6 NUH-05-4005 14 NUHOMS-FF DSC 22 Outer Top Cover Plate NUH-05-1034-FF1 0

4 NUH-05-4005 14 NUHOMS-FF DSC 23 Siphon & Vent Port Cover Plate NUH-05-1034-FF1 0

5 NUH-05-4005 14 NUHOMS-FF DSC 24 Top Plug Bottom Casing NUH-05-1034-FF1 0

7 NUH-05-4005 14 NUHOMS-FF DSC 25 Top Plug Top Casing NUH-05-1034-FF1 0

9 NUH-05-4005 14 NUHOMS-FF DSC 26 Top Plug Side Casing NUH-05-1034-FF1 0

8 NUH-05-4005 14 NUHOMS-FF DSC 27 Top Plug Post NUH-05-1034-FF1 0

10 NUH-05-4005 14 NUHOMS-FF DSC 28

{Not Used}

N/A N/A N/A NUH-05-4005 14 NUHOMS-FF DSC 29 Liner, 1/4" Thk NUH-05-1030-FF1 0

1 NUH-05-4005 14 NUHOMS-FF DSC 30 Flange Plate NUH-05-1030-FF1 0

6(2)

NUH-05-4005 14 NUHOMS-FF DSC 31 Shear Key NUH-05-1032-FF1 0

13

RAI Clarifications and Responses - Public to DPG-19-087 Page 8 of 21 Table RAI 2-1-1 DSC Safety Classification Cross-Matrix UFSAR Drawings Safety Classification Information Dwg No.

Rev Component Item No.

Sub-component Classification Dwg No.

Rev.

Item No.

NUH-05-4005 14 NUHOMS-FF DSC 32 Top Lid Cover Plate NUH-05-1030-FF1 0

15(4)

NUH-05-4005 14 NUHOMS-FF DSC 33 Bottom Lid Adapter Plate NUH-05-1030-FF1 0

2 NUH-05-4005 14 NUHOMS-FF DSC 34 Top Lid Lifting Pintle NUH-05-1030-FF1 0

13(3)

NUH-05-4005 14 NUHOMS-FF DSC 35 Mesh, 6x6 NUH-05-1030-FF1 0

3 NUH-05-4005 14 NUHOMS-FF DSC 36 Washer Plate NUH-05-1030-FF1 0

4 NUH-05-4005 14 NUHOMS-FF DSC 37 Spacer Bar NUH-05-1030-FF1 0

5 NUH-05-4005 14 NUHOMS-FF DSC 38 Cover Plate NUH-05-1030-FF1 0

8, 10 NUH-05-4005 14 NUHOMS-FF DSC 39 Side Lid Plate NUH-05-1030-FF1 0

15(4)

NUH-05-4005 14 NUHOMS-FF DSC 40 Bottom Plug Top Casing NUH-05-1032-FF1 0

8 NUH-05-4005 14 NUHOMS-FF DSC 41 Bottom Plug Side Casing NUH-05-1032-FF1 0

11 NUH-05-4005 14 NUHOMS-FF DSC 42

Plate, Stiffening NUH-05-1032-FF1 0

9, 10 NUH-05-4005 14 NUHOMS-FF DSC 43 Plate NUH-05-1032-FF1 0

12 NUH-05-4005 14 NUHOMS-FF DSC 44

Plate, Stiffening NUH-05-1034-FF1 0

11, 12 Notes:

1. Drawings NUH-05-1020-FO1 and NUH-05-1050-FC1 show more detail than UFSAR Drawing NUH-05-4004.

They show the pin (item 16 on drawings NUH-05-1020-FO1 and NUH-05-1050-FC1) used to prevent the support rod from rotating. Both the support rod and the pin are constructed out of stainless steel material. Therefore, the pin is treated as part of the support rod in LRA Table 2-6.

2. Drawing NUH-05-1030-FF1 provides more details of the Failed Fuel Can than UFSAR Drawing NUH-05-4005. In addition to the top flange plate (bracket) it shows a bearing plate (NUH05-1030-FF1 item 7) and attachment cap screws (NUH-05-1030-FF1 item 9). [

] and are constructed of a stainless steel material the same as the bracket (NUH-05-1030-FF1 item 6). Therefore, the cap screws are treated as part of the flange plate (NUH-05-4005 Item 30) in LRA Table 2-6.

3. Drawing NUH-05-1030-FF1 provides more details of the Failed Fuel Can than UFSAR Drawing NUH-05-4005.

Drawing NUH-05-1030-FF1 shows the locking subassembly, while UFSAR drawing NUH-05-4005 shows only a simplified sub assembly (NUH-05-4005 item 34). [

] in LRA Table 2-6.

4. Drawing NUH-05-4005 shows the lid of the fuel can subassembly as consisting of two separate pieces (i.e.,

Items 32 and 39) while drawing NUH-05-1030-FF1 shows the lid as one piece (i.e., Item 15). Therefore, the classification for Item 15 of Drawing NUH-05-1030-FF1 was assigned to both item 32 and item 39 on Drawing NUH-05-4005.

RAI Clarifications and Responses - Public to DPG-19-087 Page 9 of 21 Table RAI 2-1-2 TC Safety Classification Cross-Matrix UFSAR Drawings Safety Classification Information Dwg No.

Rev Component Item No.

Sub-Component Safety Classification Safety Classification Dwg No.

Rev Item No.

NUH-05-4001 15 MP187 1

Inner Shell 2069-3000 2

1, 29 NUH-05-4001 15 MP187 2

Bottom End

Closure, Machined Forge 2069-3000 2

2(1)

NUH-05-4001 15 MP187 3

Bottom Structural Shell 2069-3000 2

3 NUH-05-4001 15 MP187 4

Top Structural Shell 2069-3000 2

4 NUH-05-4001 15 MP187 5

Top Flange, Machined Ring Forge 2069-3000 2

5 NUH-05-4001 15 MP187 6

Gamma Shield 2069-3000 2

6 15 MP187 7

Upper Trunnion Plug Cover Plate 2069-3002 1

10 NUH-05-4001 15 MP187 8

Upper Trunnion Plug Side Plate 2069-3002 1

11 NUH-05-4001 15 MP187 9

Upper Trunnion Sleeve 2069-3000 2

9 NUH-05-4001 15 MP187 10 Lower Trunnion Sleeve 2069-3000 2

10 NUH-05-4001 15 MP187 11 Pad Plate 2069-3000 2

11 NUH-05-4001 15 MP187 12 Bearing Block 2069-3000 2

12 NUH-05-4001 15 MP187 13 Tie Bar 2069-3000 2

13 NUH-05-4001 15 MP187 14 NSP Top Support Ring 2069-3000 2

14 NUH-05-4001 15 MP187 15 NSP Bottom Support Ring 2069-3000 2

15 NUH-05-4001 15 MP187 16 NSP Support Angle, Outer 2069-3000 2

16, 17, 18(2)

NUH-05-4001 15 MP187 17 Rupture Plug 2069-3000 2

23 (31)

NUH-05-4001 15 MP187 18 Plugs 2069-3000 2

20 NUH-05-4001 15 MP187 19 Neutron Shield Shell 2069-3000 2

19 NUH-05-4001 15 MP187 20 Upper Trunnion Plug Bottom Plate 2069-3002 1

12 NUH-05-4001 15 MP187 21 Rails 2069-3000 2

21 NUH-05-4001 15 MP187 22 Castable Neutron Shield Material 2069-3000 / 2069-3001 2 / 1 22 /

11 NUH-05-4001 15 MP187 23 Ram Closure Plate 2069-3001 1

2 NUH-05-4001 15 MP187 24 Top Closure Plate 2069-3001 1

3 NUH-05-4001 15 MP187 25 O-ring, Top Closure Plate (69.6 ID) 2069-3001 1

23 NUH-05-4001 15 MP187 26 O-ring, Top Closure Plate (71.4 ID) 2069-3001 1

24

RAI Clarifications and Responses - Public to DPG-19-087 Page 10 of 21 Table RAI 2-1-2 TC Safety Classification Cross-Matrix UFSAR Drawings Safety Classification Information Dwg No.

Rev Component Item No.

Sub-Component Safety Classification Safety Classification Dwg No.

Rev Item No.

NUH-05-4001 15 MP187 27 Screw, Cap Hd.

Soc.

2069-3001 1

6 NUH-05-4001 15 MP187 28 O-ring, Ram Closure Plate (19.4 ID) 2069-3001 1

25(3)

NUH-05-4001 15 MP187 29 O-ring, Ram Closure Plate (17.5 ID) 2069-3001 1

26 NUH-05-4001 15 MP187 30 Screw, Cap Hd.

Soc.

2069-3001 1

9 NUH-05-4001 15 MP187 31 Filler Plate 2069-3000 2

8 NUH-05-4001 15 MP187 32 Hardened Washer (3" OD) 2069-3001 1

21 NUH-05-4001 15 MP187 33 Hardened Washer (1.5" OD) 2069-3001(4) 1 22 NUH-05-4001 15 MP187 34 Screw, Cap Hd.

Soc.

2069-3002 1

7 NUH-05-4001 15 MP187 35 Test Port Screw 2069-3001 1

15 NUH-05-4001 15 MP187 36 Vent/Drain Port Screw 2069-3001 1

15 NUH-05-4001 15 MP187 37 O-ring (2" ID) 2069-3001 1

16(3)

NUH-05-4001 15 MP187 38 Impact Limiter Attch. Block 2069-3000 2

7 NUH-05-4001 15 MP187 39 Vent/Drain Port Seal 2069-3001 1

17 NUH-05-4001 15 MP187 40 Test Port Seal 2069-3001 1

17 NUH-05-4001 15 MP187 41 Test/Vent/Drain Threaded Insert 2069-3001 1

18 NUH-05-4001 15 MP187 42 Vent/Drain Port Plug 2069-3001 1

19 NUH-05-4001 15 MP187 43 Test Port Plug 2069-3001 1

19 NUH-05-4001 15 MP187 44 Tapered Pin 2069-3001 1

20 NUH-05-4001 15 MP187 45 Lower Trunnion Plug Cover Plate 2069-3002 1

4 NUH-05-4001 15 MP187 46 Lower Trunnion Plug Shield Block 2069-3002 1

5 NUH-05-4001 15 MP187 47 Screw, Flat Hd.

Cap 2069-3002 1

6 NUH-05-4001 15 MP187 48 Spacer Washer Not Used MP187-1 built using Alternative 2

(2069-3001)(1) 1 N/A NUH-05-4001 15 MP187 49 NSP Support Angle, Inner 2069-3000 2

24, 25, 26(2)

NUH-05-4001 15 MP187 50 Screw, Thread Insert (1"-

8UNC) 2069-3000 2

27 NUH-05-4001 15 MP187 51 Screw, Thread Insert (2"-

12UN) 2069-3000 2

28

RAI Clarifications and Responses - Public to DPG-19-087 Page 11 of 21 Table RAI 2-1-2 TC Safety Classification Cross-Matrix UFSAR Drawings Safety Classification Information Dwg No.

Rev Component Item No.

Sub-Component Safety Classification Safety Classification Dwg No.

Rev Item No.

NUH-05-4001 15 MP187 52 10 Gage Sheet 2069-3002 1

25 NUH-05-4001 15 MP187 53 Tube, 1-1/2" Sch. 40 2069-3002 1

24 NUH-05-4003 10 MP187 1

Castable Neutron Shield Material 2069-3001 / 2069-3002 1 / 1 11 / 1 NUH-05-4003 10 MP187 2

Outer Plug Cover Plate 2069-3002 1

13 NUH-05-4003 10 MP187 3

Outer Plug Sleeve 2069-3002 1

14 NUH-05-4003 10 MP187 4

Nut, 1/2-13UNC-2B 2069-3002 1

15 NUH-05-4003 10 MP187 5

Inner Plug Cover Plate 2069-3002 1

16 NUH-05-4003 10 MP187 6

Inner Plug Sleeve 2069-3002 1

17 NUH-05-4003 10 MP187 7

Inner Plug Inside Sleeve 2069-3002 1

18 NUH-05-4003 10 MP187 8

Pipe, 1" Sch.

40 2069-3002 1

19 NUH-05-4003 10 MP187 9

Lifting Eye, Drop Forged 2069-3002 1

20 NUH-05-4003 10 MP187 10 Bolt, 1-8UNC-2A 2069-3002 1

21 NUH-05-4003 10 MP187 11 Outer Plug Support Bracket 2069-3002 1

22 NUH-05-4003 10 MP187 12 Plate, 1/2" Thk 2069-3002 1

23 NUH-05-4003 10 MP187 13 Key Plug Cover Plate 2069-3002 1

2 NUH-05-4003 10 MP187 14 Flat Hd Socket Cap Screw 2069-3002 1

6 NUH-05-4003 10 MP187 15 Socket Hd Cap Screw 2069-3001 1

14 NUH-05-4003 10 MP187 16 Lower Trunnion 2069-3001 1

12 NUH-05-4003 10 MP187 17 Upper Trunnion 2069-3001 1

13 NUH-05-4003 10 MP187 18 Trunnion Back 2069-3001 1

10 NUH-05-4003 10 MP187 19 Key Plug Side Plate 2069-3002 1

8 NUH-05-4003 10 MP187 20 Key Plug Bottom Plate 2069-3002 1

9 NUH-05-4003 10 MP187 21 Hardened Washer 2069-3001 1

22 Notes:

1. Note No. 15 on drawing NUH-05-4001 instructs the fabricator to prevent lead ingress to the weld during welding of the forging (Item 2 on drawing NUH-05-4001) to the shell (Item 3 on drawing NUH-05-4001). [

] (Items 32 and 33 on drawing 2069-3000). Since Items 32 and 33 on drawing 2069-3000 are related to a fabrication method and do not involve an intended safety function of the MP187 TC, they are not listed on LRA Table 2-8.

RAI Clarifications and Responses - Public to DPG-19-087 Page 12 of 21

2. Drawing 2069-3000 also lists part No. 30 (rivets) which are not shown on the UFSAR drawings. [

] and allowed per note 14 on drawing NUH-05-4001. Since the items are only related to fabrication, they are not listed on LRA Table 2-8.

3. See Table RAI 2-1-3 for more information related to the determination of the safety classification related to this item.

4. Item 33 of drawing NUH-05-4001 identifies hardened washers used with the bolts for the trunnion plugs and the ram closure plate. Drawing 2069-3001 Item 22 is the corresponding washer used for the ram closure plates and drawing 2069-3002 Item 3 is the corresponding washers used for the trunnion plugs. Since Item 22 on drawing 2069-3001 [

] Table 2-8 lists the higher of these classification and Table 2-1-2 lists drawing 2069-3001 item 22 as the source.

RAI Clarifications and Responses - Public to DPG-19-087 Page 13 of 21 RAI 2-2 clarification:

Please clarify the following items identified in Table RAI 2-2-2, which was provided in response to RAI 2-2:

Item #34: The descriptions in LRA Sections B.3.1, B.4.1, B.5.1, B.6.1 and B.3.2, B.4.2, B.5.2, and B.6.2 should be consistent. B.4.1 states: The HSM subcomponents subject to aging management review are constructed of the following materials: B.4.2 states: The HSM subcomponents that are subject to aging management are exposed to the following environments:

Since the aging management review is contained in Section 3 of the LRA and Appendix B is the aging management program description, it appears that aging management review in B.4.1 should be aging management as stated in B.4.2. Please clarify.

Item #35: Please clarify if there is a typo in the change to LRA Sections B.4.4. The NRC staff believes it should read "of the aging effects and/or mechanism listed in Section B.4.3".

Item #38: Please clarify if there is a typo in the change to LRA Sections B.4.5(3). The NRC staff believes it should read "While no aging mechanisms were identified that would cause other conditions.

Item #43: Please clarify if there is a missing word in the change to LRA Sections B.6.5(3). The NRC believes the following sentence should include the word steel. "(4) loss of material due to general, pitting, and crevice corrosion for carbon steel reinforcing bars.

The information requested in RAI 2-2 is needed to determine compliance with 10 CFR 72.24(c) and 72.42(a).

Response to RAI 2-2 clarification:

Item #34 SMUD agrees that the descriptions in LRA Sections B.3.1, B.4.1, B.5.1, B.6.1 and B.3.2, B.4.2, B.5.2, and B.6.2 should be consistent. Since Appendix B contains the AMPs and not the aging management reviews, the sections have been revised using the following format:

The [SSC] subcomponents subject to the AMP are constructed of the following material:

OR The [SSC] subcomponents subject to the AMP are exposed to the following environment(s)

Item #35 SMUD agrees that there is a typo in Section B.4.4. The section should refer to section B.4.3 for the listing of the aging effects and/or mechanisms for the HSMs. Section B.4.4 has been revised to refer to the correct section.

RAI Clarifications and Responses - Public to DPG-19-087 Page 14 of 21 Item #38 SMUD has revised the Section B.4.5(3) to correct the typo. The sentence now reads:

While no aging mechanisms were identified that would cause other conditions, Item #43 SMUD has revised LRA Section B.6.5(3) to include the word steel in the phrase carbon steel reinforcing bars.

Impact:

LRA Sections B.3.1, B.3.2, B.4.1, B.4.2, B.4.4, B.4.5(3), B.5.1, B.5.2, B.6.1, B.6.2, and B.6.5(3) have been revised as described in the response.

RAI Clarifications and Responses - Public to DPG-19-087 Page 15 of 21 RAI 2-8 clarification RAI 2-8 requested, in part, that the licensee provide a justification as to why the guide tubes did not provide a criticality safety function during the extended period of operation. The response to the RAI stated that the guide tubes solely support the structural safety function as shown in LRA Table 2-9, and that this conclusion is solely consistent with the intended safety functions of the components list in Table 4-25 of NUREG-2214, Managing Aging Processes in Storage Report, Draft for Comment (Agencywide Documents Access and Management System (ADAMS)

Accession No. ML17289A237).

The NRC bases an ISFSI license renewal on the continuation of the approved design bases through the period of extended operation. After reviewing Section 3.3.4 of the Rancho Seco Final Safety Analysis Report, NRC staff determined that the guide tubes are explicitly modeled in the Rancho Seco criticality safety evaluations. In describing the criticality models, Section 3.3.4.3.1 specifically identifies that a minimum thickness was employed to model the guide tubes. In addition, Section 3.3.4.3.1 also identifies that KENO input files for the criticality calculations can be found in Appendix 6.6.2 of the MP187 Part 71 safety analysis report. NRC staff reviewed these KENO input files and found the guide tubes explicitly identified.

Consequently, the staff found that the explanation provided in the previous paragraph did not adequately justify the licensees scoping determination because the guide tubes serve a criticality function by displacing water which decreases the neutron multiplication factor (keff).

The NRC requests the licensee supplement their response to RAI 2-8 by providing further justification as to why the guide tubes do not perform a criticality safety function during the extended period of operation. Alternatively, the licensee could modify the scoping of the guide tubes to include a criticality function in addition to the structural function for which the guide tubes are currently shown to scope into the renewal review.

The information requested in RAI 2-8 is needed to determine compliance with 10 CFR 72.42(a).

Response to RAI 2-8 clarification:

While the design intended functions of the guide tubes are not related to criticality control, the guide tubes are included in the criticality models described in the Rancho Seco Final Safety Analysis Report. [

] Since the guide tubes will always be present during dry storage, SMUD had originally determined that they did not have a criticality function. However, it is clear that the guide tubes are in the criticality models.

Therefore, SMUD has revised LRA Table 2-9 to indicate that the guide tubes have a criticality control intended function. Since the guide tubes were already in-scope, due to having a structural intended function, stating that they have a criticality function does not impact the aging management review of the guide tubes.

Impact:

LRA Table 2-9 has been revised as described in the response.

RAI Clarifications and Responses - Public to DPG-19-087 Page 16 of 21 Chapter 3 - Aging Management Review RAI 3-2 clarification:

RAI 3-2 Part (ii) requested that the licensee clarify why radiation-induced SCC is determined to be an aging effect requiring management. In the RAI response, the gamma dose rate at the beginning of storage to the end of the period of extended operation was calculated using a conversion factor based on the density of concrete, as per Calculation 502917-0500 (part of the information submitted per the NRCs request for supplemental information (ADAMS Accession No. ML18179A255) in June 2018.

The NRC requests the licensee supplement their response to RAI 3-2 by providing an explanation of why a concrete conversion factor was used to calculate dose rate on the canister surface.

The information requested in RAI B-2 is needed to determine compliance with 10 CFR 72.42(a).

Response to RAI 3-2 clarification:

As stated in LRA Section 3.4.4.2, the gamma radiation effects on corrosion of a dry shielded canister (DSC) involve radiolysis of the water and moisture adsorbed in the hygroscopic salts on the canister surface. Since the density of water is of the same order of magnitude as concrete, and to be consistent with the information already in the LRA, SMUD chose to convert the gamma heating rate in the HSM concrete shown in LRA Table A-3 to Rad/hr. (Note that the gamma heating rate in LRA Table A-3 came from Calculation 502917-0500, which models the distance between the outer DSC surface and inner HSM as [

] To be consistent with the way the gamma heating rate reported in LRA Table A-3 was generated, the conversion factor (MEV/cm3 s to Rad/hr) needed to be based on the density of concrete.

Additional information on the gamma dose rate in water on the surface of a NUHOMS DSC may be found in TN Americas Calculation 67009-TLAA25, which was performed as part of responding to a similar RAI for the renewal application for CoC 1004. A copy of Calculation 67009-TLAA25 is provided in Enclosure 7. The assumptions used in Calculation 67009-TLAA25 (such as the decay heat load per assembly and number of fuel assemblies stored in the DSC) bound the fuel stored at the Rancho Seco ISFSI site. Therefore, the results of Calculation 67009-TLAA25 provide a conservative estimate of the gamma dose seen by any moisture/water on the surface of a DSC. The results in Table 7-4 and Table 7-5 of Calculation 67009-TLAA25 clearly show that the magnitude of the gamma dose rate may range from 104 to 103 Rad/hr during the storage period. Therefore, the range of gamma dose rates provided in the original response to RAI 3-2 (i.e., [

] are reasonable.

As explained in the original response to RAI 3-2, due to the lack of data that these dose rates (103 Rad/hr to 104 Rad/hr) could have on localized corrosion, SMUD cannot rule out the possibility that radiolysis of the water and moisture adsorbed in the hygroscopic salts on the canister surface can occur. Therefore, the aging management review conservatively considered that gamma radiolysis of water on the canister surface could contribute to a corrosive environment.

RAI Clarifications and Responses - Public to DPG-19-087 Page 17 of 21 Impact:

No change to the LRA as a result of this question.

RAI Clarifications and Responses - Public to DPG-19-087 Page 18 of 21 RAI 3-5 clarification:

Please clarify if microbiological chemical attack should be deleted from the list under Loss of Material in LRA Section 3.6.5. This response is related to the Response to RAI B-1.

The information requested in RAI 3-5 is needed to determine compliance with 10 CFR 72.42(a).

Response to RAI 3-5 clarification:

The phrase including microbiological chemical attack was inadvertently not deleted as intended in Section 3.6.5 as part of the original response to RAI 3-5. Section 3.6.5 has been revised to delete microbiological chemical attack as an aging mechanism that could lead to a loss of material aging effect.

Impact:

LRA Section 3.6.5 has been revised as described in the response.

RAI Clarifications and Responses - Public to DPG-19-087 Page 19 of 21 Appendix B - Aging Management Program RAI B-2(1) clarification:

RAI B-2 (part 1) asked the licensee to address certain inconsistencies detailed in the HSM Aging Management Program (AMP). In the response, SMUD concluded...that the 10-year inspection frequency referred to in American Concrete Institute (ACI) 349.3R for inaccessible areas and controlled interior environments is appropriate for the inspection frequency of the exterior of the HSM and basemat based on the lack of an aggressive environment and the physical conditions of the HSM and basemat structures.

The NRC notes that the 10 year inspection frequency in ACI 349.3R is for interior environments.

Since the HSMs are stored in an exterior environment, the NRC is requesting that SMUD supplement their response to RAI B-2(1) by providing justification as to why a 10-year inspection interval is appropriate for the HSM AMP.

The information requested in RAI B-2 is needed to determine compliance with 10 CFR 72.24(e) and 72.42(a).

Response to RAI B-2(1) clarification:

Chapter 6 of ACI-349.3R (2018) states that The frequency at which periodic evaluations are conducted using the evaluation procedure should be defined by the owner based on need.

Evaluation frequency should be based on the aggressiveness of the environmental conditions and physical conditions of the plant structures. The established frequencies should also ensure that any age-related degradation is detected at an early stage of degradation and appropriate mitigative actions can be implemented. It goes on to say that, In general, all structures and groundwater quality should be monitored on a frequency not to exceed 5 years. The structures under controlled interior environmental conditions can be monitored at an interval exceeding 5 years, but not exceeding 10 years. When determining the inspection frequency, SMUD considered the interior of the HSM separately from the exterior of the HSM and basemat.

The interior of the HSM is a normally non-accessible area that is protected from direct exposure to sun, wind, or rain. While the concrete will see elevated temperatures and is exposed to radiation, these factors are not expected to contribute to the degradation rate of the credible concrete aging mechanisms/effects listed in LRA Section 3.5.4.6. While ambient air will flow through the HSM, the Rancho Seco site is located in an environment that is considered dry and away from sources of contaminants and thus not expected to accelerate the degradation rate of aging mechanisms/effects. While the interior environment of the HSM is not strictly a controlled interior environment, it is considered to be a benign environment for aging mechanisms/effects, and thus may be treated as a controlled interior environment for establishing the frequency of visual inspections. The pre-application inspection performed in May 2017 did not identify any age related degradation effects after 17 years of operating experience. SMUD also notes that performing an inspection of the interior of the HSM at a frequency greater than that of the DSC external surfaces (described in LRA Section B.3.5), will result in increased dose to workers/inspectors without a corresponding increase in safety. Therefore, SMUD determined that it is appropriate to set the inspection frequency of the interior of the HSM at 10 +/- 2 years as allowed by Table 6 of ACI 349.3R (2018) for controlled interior environments.

RAI Clarifications and Responses - Public to DPG-19-087 Page 20 of 21 The exterior of the HSMs and basemat surface are accessible areas that are not protected from the direct exposure to sun, wind, or rain, i.e., they are exposed to the natural environment.

Therefore, Table 6 of ACI 349.3R (2018) would call for a frequency of visual inspection of every 5 years. However, Chapter 6 of ACI 349.3R also says that the inspection frequency should be defined by the owner based on need. SMUD evaluated the need for inspection frequency by qualitatively assessing the rate of degradation of each credible aging mechanism listed in LRA Sections 3.5.4.6 and 3.6.5. The Rancho Seco site is located in an environment that is considered dry and away from sources of contaminants, i.e., a benign environment. The limited amount of moisture in the environment will reduce the rate of corrosion of embedded steel and leaching of the concrete. The lack of nearby industrial facilities and salted roads limits the source for aggressive chemical attacks. As discussed in Section 3.5.1.3 of the MAPS report [1],

alkali silica reaction requires the availability of moisture (e.g., relativity humidity greater than 80 percent) and is a slow degradation mechanism. Similarly, the lack of moisture will reduce the rate of the delayed ettringite formation (DEF) and settlement aging mechanisms. Therefore, the rate of degradation due to the aging effects/mechanisms of concrete listed in the LRA is expected to be less than the rate of degradation used as the basis for the frequency listed in ACI-349.3R (2018) for structures exposed to the natural environment. A frequency greater than the 5 year interval is also supported by the results of the pre-application inspection performed in May 2017. As stated in LRA Section 3.2.4, direct visual inspections were performed on the HSM doors, roofs, and exterior concrete surfaces (i.e., exterior surfaces of all the HSMs). The inspection did not identify any age related degradation effects after 17 years of service. Based on the results of the pre application inspections, SMUD expects that the HSMs will continue to perform their intended safety functions through the PEO without any significant age related degradation due to the benign environment. In addition, it is noted that performing inspections around the exterior of the HSMs at an increased frequency (5 year when observable data indicates a 10 year frequency would be appropriate) would expose inspection personnel to increased safety risk and radiation exposure without significant value added to the AMP.

Therefore, SMUD concludes an inspection frequency of 10 +/- 2 years is justified for the exterior of the HSMs and the basemat.

As additional confirmation that the proposed 10 year inspection frequency (for both the interior and exterior of the HSM and basemat) is appropriate, the performance of a baseline inspection shortly into the PEO will provide the opportunity to confirm the condition of the HSMs and basemat.

Reference 1: NUREG-2214, Managing Aging Processes in Storage Report, Draft for Comment (ADAMS Accession No. ML17289A237)

Impact:

No change to the LRA as a result of this question.

RAI Clarifications and Responses - Public to DPG-19-087 Page 21 of 21 RAI B-4 clarification:

Please clarify if LRA Sections 2.3.1, 2.4.3, 3.7.1, 3.7.5.2 need to be revised. The response to the RAI stated that these sections have been revised; however, they have not. This response is related to the Response to RAI B-5(3).

Please clarify whether Section C.2.4.4 for inspection of offsite shipment should be changed to for inspection or offsite shipment.

The information requested in B-4 is needed to determine compliance with 10 CFR 72.42(a).

Response to RAI B-4 clarification:

It was the intent of the original response to RAI B-4 that the LRA would be revised to clarify that the MP187 TC would only be used again if the DSC was to be removed from the HSM for inspection or for offsite shipment. Therefore, the original response intended to revise all LRA sections that mention removal of a DSC from the HSM. This clarification inadvertently did not get incorporated as intended into LRA Sections 2.3.1, 2.4.3, 3.7.1 and 3.7.5.2.

SMUD has revised LRA Sections 2.3.1, 2.4.3, 3.7.1 and 3.7.5.2 to clarify that the TC will only be used if the DSC is retrieved from the HSM for inspection or shipment offsite. LRA Section C.2.4.4 has also been revised to say for inspection or offsite shipment.

Impact:

LRA Sections 2.3.1, 2.4.3, 3.7.1, 3.7.5.2, and C.2.4.4 have been revised as described in the response.