RAIO-0618-60327, LLC Supplemental Response to NRC Request for Additional Information No. 110 (Erai No. 8932) on the NuScale Design Certification Application

LLC Supplemental Response to NRC Request for Additional Information No. 110 (Erai No. 8932) on the NuScale Design Certification Application

ML18157A262
Person / Time
Site:	NuScale
Issue date:	06/06/2018
From:	Rad Z NuScale
To:	Document Control Desk, Office of New Reactors
References
RAIO-0618-60327
Download: ML18157A262 (46)

Text

RAIO-0618-60327 NuScale Power, LLC 1100 NE Circle Blvd., Suite 200 Corvalis, Oregon 97330, Office: 541.360.0500, Fax: 541.207.3928 www.nuscalepower.com June 06, 2018 Docket No.52-048 U.S. Nuclear Regulatory Commission ATTN: Document Control Desk One White Flint North 11555 Rockville Pike Rockville, MD 20852-2738

SUBJECT:

NuScale Power, LLC Supplemental Response to NRC Request for Additional Information No. 110 (eRAI No. 8932) on the NuScale Design Certification Application

REFERENCES:

1. U.S. Nuclear Regulatory Commission, "Request for Additional Information No. 110 (eRAI No. 8932)," dated July 30, 2017

2. NuScale Power, LLC Response to NRC "Request for Additional Information No. 110 (eRAI No.8932)," dated April 30, 2018 The purpose of this letter is to provide the NuScale Power, LLC (NuScale) supplemental

response to the referenced NRC Request for Additional Information (RAI).

The Enclosure to this letter contains NuScale's supplemental response to the following RAI

Question from NRC eRAI No. 8932:

v 03.07.02-4 This letter and the enclosed response make no new regulatory commitments and no revisions to

any existing regulatory commitments.

If you have any questions on this response, please contact Marty Bryan at 541-452-7172 or at

mbryan@nuscalepower.com.

Sincerely, Zackary W. Rad Director, Regulatory Affairs NuScale Power, LLC Distribution: Gregory Cranston, NRC, OWFN-8G9A Samuel Lee, NRC, OWFN-8G9A Marieliz Vera, NRC, OWFN-8G9A : NuScale Supplemental Response to NRC Request for Additional Information eRAI

No. 8932

RAIO-0618-60327 NuScale Power, LLC 1100 NE Circle Blvd., Suite 200 Corvalis, Oregon 97330, Office: 541.360.0500, Fax: 541.207.3928 www.nuscalepower.com :

NuScale Supplemental Response to NRC Request for Additional Information eRAI No. 8932

NuScale Nonproprietary Response to Request for Additional Information Docket No.52-048 eRAI No.: 8932 Date of RAI Issue: 07/30/2017 NRC Question No.: 03.07.02-4 10 CFR 50 Appendix S requires that the safety functions of structures, systems, and

components (SSCs) must be assured during and after the vibratory ground motion associated

with the Safe Shutdown Earthquake (SSE) through design, testing, or qualification methods.

On Page 3.7-22 of the FSAR, in the second paragraph, to discuss the adequacy of 7P Extended

Subtraction Method (ESM) model, the applicant provided 7P versus 9P ISRS comparisons for

the Capitola time histories in Figures 3.7.2-8 to10. However, the FSAR does not provide a

comparison of transfer functions for the 7P and 9P models. The review of transfer functions is

essential to ensure that the numerical implementation of the SSI analysis methods is acceptable

and consistent with the guidance in DSRS Section 3.7.2. In the same paragraph, the applicant

also states, This level of agreement justifies using a 7P versus a 9P model and, because the

results are similar, demonstrates the acceptability of using the extended subtraction method as

an alternative to the direct method. The staff believes that 7P vs 9P ESM comparison captures

only an incremental enhancement between the two models. The adequacy of an ESM model

should be established against the direct method (DM). Therefore, in addition to a comparison of

the 7P and 9P ESM models, the applicant is requested to provide a comparison of the transfer

functions for the 7P ESM and the DM models at selected nodes of the critical sections and other

important locations in the RXB and CRB, or, provide technical justification for why a 7P vs 9P

comparison is sufficient and acceptable. Guidance in DSRS Section 3.7.2 allows the use of

reduced-size models in comparing the solutions of the subtraction or modified subtraction

method (SM/MSM) with those of the DM to gain insight into the adequacy of SM/MSM.

NuScale Response:

As discussed in an NRC Public meeting on 5/9/2018, NuScale submitted a response to this RAI recently (4/30/2018). In the NuScale Closure Plan for FSAR Sections 3.7 and 3.8 RAIs for this item, NuScale addressed comparisons in terms of transfer functions (TFs), ISRS, soil pressures, forces and moments, and relative displacements at key locations. However, in contrast to the closure plan, the RAI response addressed only comparisons of TFs and ISRS.

NuScale Nonproprietary As described in the closure plan for this question, soil pressures, forces and moments, and displacements at key locations for each modeling method (7P vs DM) are presented in the tables and figures below.

Table 1: RXB North Wall Soil Pressure Comparison Soil Layer Centroidal Z (inch) 7P DM Soil Pressure (ksf)

Soil Pressure (ksf) 907.5 2.4 2.6 832.5 3.9 3.9 757.5 8.0 8.1 682.5 6.8 6.8 607.5 5.3 5.7 532.5 5.3 5.2 457.5 4.3 4.7 382.5 4.5 4.4 307.5 3.6 3.0

NuScale Nonproprietary Table 2: Myy of RXB Exterior Wall Shell Elements on Top of Basemat.

Moments about In-Plane Horizontal Axis in Shell Elements around the Edges of Basemat Element Count Elem. No.

7P DM Myy (kip-ft-ft)

Myy (kip-ft-ft) 1 2588 24 24 2

2589 48 47 3

2590 50 49 4

2591 49 48 5

2592 43 41 6

2593 25 24 7

2594 26 25 8

2595 51 47 9

2596 51 48 10 2597 48 44 11 2598 31 31 12 2606 23 24 13 2615 52 51 14 2624 66 63 15 2635 65 59 16 2641 64 54 17 2643 41 34 18 2645 61 53 19 2650 111 100 20 2653 117 106 21 2656 120 109 22 2660 111 106 23 2663 105 99 24 2668 58 56 25 2671 48 46 26 2674 87 81 27 2677 92 87 28 2681 95 90 29 2683 96 91 30 2685 97 92 31 2687 97 93 32 2697 95 91 33 2703 91 88 34 2709 83 80 35 2717 45 44 36 2729 46 45

NuScale Nonproprietary Table 2: Myy of RXB Exterior Wall Shell Elements on Top of Basemat.

37 2741 82 79 38 2749 84 81 39 2761 86 83 40 2769 85 82 41 2781 84 82 42 2789 86 81 43 2801 83 80 44 2809 81 78 45 2821 78 75 46 2829 73 70 47 2835 41 39 48 2847 42 39 49 2859 74 71 50 2867 79 76 51 2879 82 79 52 2887 82 79 53 2899 82 79 54 2907 82 78 55 2919 81 77 56 2927 79 76 57 2939 75 72 58 2947 70 65 59 2953 37 35 60 2963 36 33 61 2965 63 60 62 2967 51 49 63 2975 36 34 64 2979 17 19 65 2991 6

8 66 2992 21 19 67 2993 14 14 68 2994 13 13 69 2995 19 16 70 2996 8

6 71 2997 7

5 72 2998 21 19 73 2999 10 10 74 3000 21 21 75 3001 18 27 Maximum 120 109

% diff of Maximums

+10.1%

% = (7P-DM)/DM*100. A positive % indicates that the 7P value is greater than the DM value.

NuScale Nonproprietary Table 3: Vertical Stresses zz in Selected RXB Basemat Solid Elements Vertical Stresses in 44 Selected Basemat Solid Elements Element Count.

Solid Elem. No.

7P DM zz (psi) zz (psi) 1 646 40 48 2

647 28 33 3

648 19 23 4

649 20 25 5

650 26 24 6

651 28 33 7

652 27 31 8

653 22 23 9

654 24 25 10 655 41 42 11 656 100 81 12 676 37 42 13 677 23 24 14 678 18 21 15 679 19 21 16 680 25 24 17 681 28 34 18 682 28 30 19 683 19 19 20 684 15 13 21 685 36 33 22 686 103 84 23 826 24 24 24 827 72 74 25 828 118 121 26 829 108 106 27 830 71 69 28 831 45 54 29 832 52 58 30 833 67 75 31 834 68 75 32 835 58 60 33 836 93 79 34 856 24 24 35 857 69 82 36 858 109 112 37 859 98 94 38 860 63 71

NuScale Nonproprietary Table 3: Vertical Stresses zz in Selected RXB Basemat Solid Elements 39 861 45 52 40 862 57 64 41 863 70 82 42 864 71 79 43 865 65 69 44 866 93 87 Maximum 118 121

% diff of Maximums

-2.5%

% = (7P-DM)/DM*100. A negative % indicates that the 7P value is less than the DM value.

NuScale Nonproprietary Table 4: Forces and Moments in First Vertical Strip of the RXB North Exterior Wall between Column Lines RX3 and RX4 (X=1447")

Elem No.

Elem.

No.

Z-Coord inch SASSI Method Sxx kip-ft Syy kip-ft Sxy kip-ft Mxx kip-ft-ft Myy kip-ft-ft Vxz kip-ft Vyz kip-ft 2683 2685 157.5 7P 40 195 158 20 100 1

31 DM 43 168 158 20 96 1

28 3379 3383 232.5 7P 39 176 156 16 58 1

11 DM 43 159 155 19 61 1

10 4067 4071 307.5 7P 39 165 155 23 72 1

5 DM 44 154 153 23 74 2

6 4613 4617 382.5 7P 149 44 152 59 19 17 3

DM 143 48 150 58 19 19 3

5729 5733 457.5 7P 137 44 150 58 17 25 2

DM 135 45 150 55 17 26 2

6285 6289 532.5 7P 130 42 152 141 31 6

2 DM 131 42 152 145 31 6

2 6866 6870 607.5 7P 128 42 152 98 26 21 1

DM 128 42 152 99 26 22 1

7806 7808 682.5 7P 129 45 150 155 40 52 12 DM 130 45 154 169 42 55 13 9021 9033 757.5 7P 73 50 145 58 25 48 12 DM 78 48 145 61 26 49 12 9614 9626 832.5 7P 75 51 144 165 31 12 2

DM 79 52 146 174 32 14 2

10507 10517 907.5 7P 72 58 144 326 61 12 6

DM 76 58 147 346 63 14 6

11254 11256 982.5 7P 67 58 138 173 64 48 5

DM 72 58 141 178 66 51 5

12418 12422 1057.5 7P 67 79 134 472 129 49 11 DM 74 79 135 492 135 52 12 12806 12810 1132.5 7P 60 122 126 226 80 32 7

DM 65 124 128 233 83 34 8

13239 13243 1207.5 7P 55 163 118 99 41 25 2

DM 60 169 121 102 43 26 2

13651 13655 1282.5 7P 52 199 110 148 46 21 3

DM 56 208 113 158 50 22 3

14708 14712 1348.5 7P 42 224 95 151 56 23 3

DM 46 234 102 164 61 24 3

15018 15022 1405.5 7P 40 236 94 224 68 19 1

DM 44 247 101 237 74 19 2

15339 15343 1462.5 7P 39 250 90 284 80 13 1

DM 43 261 99 297 85 13 2

15676 15680 1519.5 7P 38 265 85 321 87 8

6 DM 42 276 93 338 92 8

6

NuScale Nonproprietary Table 4: Forces and Moments in First Vertical Strip of the RXB North Exterior Wall between Column Lines RX3 and RX4 (X=1447")

16155 16159 1582.5 7P 36 287 77 320 87 7

5 DM 38 300 82 337 91 8

6 16454 16458 1651.5 7P 36 316 74 274 84 14 1

DM 38 329 78 288 89 14 1

16753 16757 1720.5 7P 36 350 69 184 69 22 1

DM 37 363 73 192 73 23 1

17052 17056 1789.5 7P 35 389 63 85 44 31 4

DM 36 403 66 87 47 32 4

NuScale Nonproprietary Table 5: Comparison of RXB Maximum Forces and Moments in First Vertical Strip of the North Exterior Wall between Column Lines RX3 and RX4 (X=1447") between 7P and DM Force or Moment Component Description Maximum Values 7P DM Difference

(%)

Sxx (kip-ft)

In-Plane Force in the EW Direction 149 143

+4.4%

Syy (kip-ft)

In-Plane Force in the Vertical Direction 389 403

-3.6%

Sxy (kip-ft)

In-Plane Shear Force 158 158

-0.1%

Mxx (kip-ft-ft)

Bending about the Vertical Axis 472 492

-4.0%

Myy (kip-ft-ft)

Bending about EW Axis 129 135

-4.0%

Vxz (kip-ft)

Out-of-Plane Shear in the Vertical Section 52 55

-4.5%

Vyz (kip-ft)

Out-of-Plane Shear in the Horizontal (EW) Section 31 28

+10.5%

% = (7P-DM)/DM*100. A positive % indicates that the 7P value is greater than the DM value.

The twisting moment Mxy was added to Mxx and Myy.

NuScale Nonproprietary Table 6: RXB Forces and Moments in Second Vertical Strip of the North Exterior Wall at Column Line RX4 (X=1872") Calculated by the 7P ESM Elem.

No.

Elem.

No.

Z-Coord inch SASSI Method Sxx kip-ft Syy kip-ft Sxy kip-ft Mxx kip-ft-ft Myy kip-ft-ft Vxz kip-ft Vyz kip-ft 2717 2729 157.5 7P 42 151 128 23 62 13 36 DM 40 141 132 25 62 13 35 3427 3449 232.5 7P 34 141 130 38 52 9

22 DM 34 139 133 38 55 10 21 4099 4119 307.5 7P 30 147 128 30 49 10 15 DM 31 142 131 31 53 10 15 4637 4653 382.5 7P 143 28 123 53 32 20 6

DM 144 29 127 50 32 23 6

5773 5795 457.5 7P 125 31 129 74 41 23 10 DM 124 33 132 75 42 24 10 6329 6351 532.5 7P 122 30 129 84 35 11 23 DM 122 31 133 89 37 11 24 6900 6922 607.5 7P 124 35 127 98 52 26 7

DM 122 35 131 103 55 28 7

7818 7820 682.5 7P 116 39 123 70 32 45 13 DM 116 39 128 76 32 48 14 9077 9097 757.5 7P 93 60 135 103 78 101 5

DM 95 59 138 106 81 106 6

9670 9690 832.5 7P 90 79 132 240 84 80 31 DM 92 78 136 251 90 86 33 10551 10561 907.5 7P 89 101 135 233 48 29 40 DM 91 102 139 244 50 31 42 11268 11270 982.5 7P 92 129 132 123 79 59 19 DM 92 131 136 126 84 61 20 12452 12470 1057.5 7P 73 140 137 219 53 53 17 DM 77 144 140 225 56 56 18 12834 12846 1132.5 7P 73 134 133 175 80 49 15 DM 76 137 136 179 84 53 16 13272 13286 1207.5 7P 73 147 142 167 95 99 21 DM 76 151 144 172 99 105 21 13684 13698 1282.5 7P 76 154 132 156 87 95 18 DM 76 158 133 164 90 100 18 14740 14748 1348.5 7P 61 170 89 143 90 107 13 DM 63 176 94 150 93 110 13 15044 15049 1405.5 7P 71 162 83 189 102 105 15 DM 71 169 87 196 105 108 15 15363 15369 1462.5 7P 72 183 90 221 115 134 7

DM 73 189 94 230 118 137 7

15700 15706 1519.5 7P 94 234 89 363 118 130 20 DM 90 243 91 374 122 133 21

NuScale Nonproprietary Table 6: RXB Forces and Moments in Second Vertical Strip of the North Exterior Wall at Column Line RX4 (X=1872") Calculated by the 7P ESM 16179 16191 1582.5 7P 70 266 96 338 92 50 25 DM 72 275 97 350 94 53 26 16478 16490 1651.5 7P 57 286 98 265 103 119 17 DM 61 296 99 273 106 123 18 16777 16789 1720.5 7P 53 300 90 191 137 107 30 DM 56 309 90 196 141 110 31 17076 17088 1789.5 7P 47 303 73 135 143 87 26 DM 50 309 73 140 148 90 27

NuScale Nonproprietary Table 7: Comparison of Maximum RXB Forces and Moments in Second Vertical Strip of the North Exterior Wall at Column Line RX4 (X=1872") between 7P and DM Force or Moment Compared Description Maximum Values 7P DM Difference(%)

Sxx (kip-ft)

In-Plane Force in the EW Direction 143 144

-0.5%

Syy (kip-ft)

In-Plane Force in the Vertical Direction 303 309

-2.1%

Sxy (kip-ft)

In-Plane Shear Force 142 144

-1.7%

Mxx (kip-ft-ft)

Bending about the Vertical Axis 363 374

-3.0%

Myy (kip-ft-ft)

Bending about EW Axis 143 148

-3.9%

Vxz (kip-ft)

Out-of-Plane Shear in the Vertical Section 134 137

-2.6%

Vyz (kip-ft)

Out-of-Plane Shear in the Horizontal (EW) Section 40 42

-4.8%

% = (7P-DM)/DM*100. A positive % indicates that the 7P value is greater than the DM value.

The twisting moment Mxy was added to Mxx and Myy.

Table 8: Comparison of ISRS Peaks at North Lug Support Frequency (Hz) 7P ISRS DM ISRS

% diff = (7P-DM)/DM 5.25Hz 2.41 2.67

-9.9%

NuScale Nonproprietary Table 9: Comparison of Forces and Moments in the North Pool Wall near the North Lug Support of RXM1 Elem No.

Z-Coord inch SASSI Method Sxx kip-ft Syy kip-ft Sxy kip-ft Mxx kip-ft-ft Myy kip-ft-ft Vxz kip-ft Vyz kip-ft 6920 607.5 7P 84 66 166 108 334 20 35 DM 84 74 170 114 348 21 37 6926 607.5 7P 82 51 184 162 273 32 34 DM 82 58 188 171 286 33 36 6933 607.5 7P 83 58 189 143 87 13 32 DM 84 63 195 152 95 13 33 6940 607.5 7P 91 67 183 73 93 11 18 DM 91 74 188 76 100 11 18 7314 659.365 7P 111 164 171 287 366 99 89 DM 113 172 178 302 384 105 94 7318 659.365 7P 94 65 211 326 341 64 92 DM 96 75 221 347 358 66 97 7322 659.365 7P 86 110 204 169 70 22 35 DM 86 117 211 182 77 23 36 7325 659.365 7P 93 89 170 119 120 21 14 DM 92 93 175 124 129 21 15 8080 696.865 7P 104 131 92 258 372 157 45 DM 105 144 95 265 393 167 47 8084 696.865 7P 83 80 104 105 229 214 77 DM 84 91 115 102 239 228 81 8088 696.865 7P 85 111 90 144 86 99 19 DM 86 118 102 145 91 106 20 8091 696.865 7P 102 80 91 153 121 54 21 DM 103 85 94 154 132 55 22 9096 757.5 7P 175 70 124 272 311 76 51 DM 179 80 132 280 324 79 53 9102 757.5 7P 158 74 127 285 152 58 22 DM 161 84 135 294 158 60 23 9116 757.5 7P 158 76 125 254 87 44 10 DM 161 84 133 260 91 46 10 9121 757.5 7P 182 78 121 231 93 60 33 DM 186 85 126 238 102 61 35

NuScale Nonproprietary Table 10: Comparison of Maximum Forces and Moments in the North Pool Wall near the North Lug Support of RXM1 between 7P and DM Force or Moment Compared Description Maximum Values 7P DM Difference

(%)

Sxx (kip-ft)

In-Plane Force in the EW Direction 182 186

-2.3%

Syy (kip-ft)

In-Plane Force in the Vertical Direction 164 172

-4.9%

Sxy (kip-ft)

In-Plane Shear Force 211 221

-4.6%

Mxx (kip-ft-ft)

Bending about the Vertical Axis 326 347

-6.1%

Myy (kip-ft-ft)

Bending about EW Axis 372 393

-5.2%

Vxz (kip-ft)

Out-of-Plane Shear in the Vertical Section 214 228

-6.1%

Vyz (kip-ft)

Out-of-Plane Shear in the Horizontal (EW) Section 92 97

-4.4%

% = (7P-DM)/DM*100. A negative % indicates that the 7P value is less than the DM value The twisting moment Mxy was added to Mxx and Myy.

NuScale Nonproprietary Table 11: Comparison of Maximum Forces and Moments in RXB Roof between 7P and DM Force or Moment Component Description Maximum Values 7P DM Difference

(%)

Sxx (kip-ft)

In-Plane Force in the EW Direction 185 189

-2.2%

Syy (kip-ft)

In-Plane Force in the NS Direction 317 330

-3.9%

Sxy (kip-ft)

In-Plane Shear Force 324 340

-4.7%

Mxx (kip-ft-ft)

Bending about the NS Axis 276 275

+0.2%

Myy (kip-ft-ft)

Bending about EW Axis 558 559

-0.3%

Vxz (kip-ft)

Out-of-Plane Shear in the NS Section 49 49

-0.4%

Vyz (kip-ft)

Out-of-Plane Shear in the EW Section 50 52

-3.8%

% = (7P-DM)/DM*100.

The twisting moment Mxy was added to Mxx and Myy.

NuScale Nonproprietary Table 12: Forces in RXB Pilaster at RX1 (X=0") by 7P and DM Elem No.

Centroid Z

(inch) 7P DM Axial EW-Shear NS-Shear Axial EW-Shear NS-Shear P1 (kips)

P2 (kips)

P3 (kips)

P1 (kips)

P2 (kips)

P3 (kips) 861 157.5 1,712 83 94 1,924 90 106 1306 232.5 2,061 115 106 2,257 122 122 1757 307.5 2,371 100 89 2,514 96 94 2016 382.5 2,611 83 77 2,757 78 79 2336 457.5 2,865 71 70 2,989 69 71 2614 532.5 3,086 65 72 3,220 66 73 3054 607.5 3,294 58 76 3,444 61 77 3436 682.5 3,485 63 75 3,648 66 77 3791 757.5 3,625 78 38 3,791 81 39 4151 832.5 3,722 67 65 3,896 71 65 4611 907.5 3,673 55 76 3,842 58 80 5145 982.5 3,492 42 205 3,661 44 212 5340 1057.5 3,448 42 471 3,622 43 484 5429 1132.5 2,887 25 548 3,044 26 565 5604 1207.5 2,266 23 612 2,401 24 633 5624 1282.5 1,757 37 660 1,868 40 685 5666 1348.5 1,083 35 517 1,156 39 538 5770 1405.5 917 47 401 973 51 418 5850 1462.5 740 78 326 777 85 341 5870 1519.5 664 234 139 701 250 148 6104 1582.5 681 145 69 726 155 76 6256 1651.5 628 62 29 671 67 30 6314 1720.5 501 54 47 536 57 48 6396 1789.5 258 124 79 276 131 83

NuScale Nonproprietary Table 13: Moments in RXB Pilaster at RX1 (X=0") by 7P and DM Elem.

No.

Centroid Z (inch) 7P DM Torsion about EW about NS Torsion about EW about NS M1 (kip-ft)

M2 (kip-ft)

M3 (kip-ft)

M1 (kip-ft)

M2 (kip-ft)

M3 (kip-ft) 861 157.5 205 1,256 1,843 201 1,393 1,947 1306 232.5 203 2,120 1,463 200 2,287 1,411 1757 307.5 171 3,073 840 167 3,250 813 2016 382.5 142 3,957 939 135 4,114 1,067 2336 457.5 110 4,791 1,276 101 4,950 1,373 2614 532.5 72 5,637 1,567 65 5,794 1,633 3054 607.5 33 6,513 1,806 34 6,704 1,866 3436 682.5 53 7,429 2,105 60 7,644 2,165 3791 757.5 126 7,999 2,484 132 8,243 2,535 4151 832.5 201 8,292 2,719 204 8,544 2,777 4611 907.5 249 8,155 2,945 252 8,467 3,027 5145 982.5 286 7,777 3,019 291 8,084 3,112 5340 1057.5 407 6,161 2,763 413 6,419 2,860 5429 1132.5 370 2,673 2,384 375 2,785 2,473 5604 1207.5 315 5,902 2,062 322 6,169 2,145 5624 1282.5 279 10,898 1,979 292 11,423 2,075 5666 1348.5 425 2,789 2,074 451 2,920 2,157 5770 1405.5 333 5,208 2,195 347 5,438 2,294 5850 1462.5 235 7,130 2,505 245 7,435 2,641 5870 1519.5 248 7,744 3,394 261 8,085 3,608 6104 1582.5 182 1,837 1,051 191 1,896 1,107 6256 1651.5 189 1,810 1,375 200 1,869 1,460 6314 1720.5 162 1,560 1,351 171 1,623 1,432 6396 1789.5 76 980 890 80 1,023 941

NuScale Nonproprietary Table 14: Comparison of Maximum RXB Forces and Moments in Pilaster at RX1 (X=0")

between 7P and DM Force or Moment Compared Maximum Values 7P DM Difference(%)

P1 (Kips)

Axial 3,722 3,896

-4.5%

P2 (Kips)

EW-Shear 234 250

-6.5%

P3 (Kips)

NS-Shear 660 685

-3.5%

M1 (Kip-ft)

Torsion 425 451

-5.8%

M2 (Kip-ft)

Moment about EW Axis 10,898 11,423

-4.6%

M3 (kip-ft)

Moment about NS Axis 3,394 3,608

-5.9%

% = (7P-DM)/DM*100.

NuScale Nonproprietary Table 15: Forces in RXB Pilaster at RX4 (X=1872") by 7P and DM Elem No.

Centroid Z inch 7P DM Axial EW-Shear NS-Shear Axial EW-Shear NS-Shear P1 (kips)

P2 (kips)

P3 (kips)

P1 (kips)

P2 (kips)

P3 (kips) 935 157.5 848 156 291 796 163 296 1378 232.5 860 129 293 840 135 285 1810 307.5 897 97 215 872 101 200 2039 382.5 907 85 159 902 88 149 2418 457.5 772 97 226 761 100 224 2679 532.5 761 83 137 754 85 142 3103 607.5 771 77 293 757 81 335 3442 682.5 819 88 319 807 94 342 3911 757.5 575 113 1,109 598 121 1,163 4271 832.5 604 100 892 601 106 959 4719 907.5 603 108 220 600 112 220 5159 982.5 663 106 495 650 112 519 5366 1057.5 571 154 618 578 157 653 5439 1132.5 594 112 778 591 114 837 5610 1207.5 598 295 1,442 587 303 1,531 5630 1282.5 652 276 1,457 636 283 1,513 5695 1348.5 594 160 1,605 574 170 1,650 5779 1405.5 669 139 1,659 653 147 1,702 5856 1462.5 827 197 1,811 817 208 1,850 5876 1519.5 1,141 196 1,790 1,125 207 1,823 6110 1582.5 879 144 683 872 149 719 6262 1651.5 563 93 1,787 570 95 1,860 6320 1720.5 437 63 1,678 440 63 1,738 6402 1789.5 280 46 1,335 281 46 1,380

NuScale Nonproprietary Table 16: Moments in RXB Pilaster at RX4 (X=1872") by 7P and DM Elem.

No.

Centroid Z inch 7P DM Torsion about EW about NS Torsion about EW about NS M1 (kip-ft)

M2 (kip-ft)

M3 (kip-ft)

M1 (kip-ft)

M2 (kip-ft)

M3 (kip-ft) 935 157.5 27 3,928 1,823 22 4,114 1,927 1378 232.5 39 3,531 1,175 37 4,407 1,237 1810 307.5 47 4,651 750 50 5,184 778 2039 382.5 50 5,635 599 53 5,884 606 2418 457.5 63 8,217 713 68 8,654 725 2679 532.5 63 9,003 572 65 9,386 595 3103 607.5 68 8,720 529 72 9,078 528 3442 682.5 32 7,913 748 33 8,087 767 3911 757.5 64 17,071 975 66 17,544 974 4271 832.5 19 26,610 770 20 27,518 795 4719 907.5 38 29,355 848 38 30,433 872 5159 982.5 97 28,484 1,110 101 29,266 1,166 5366 1057.5 96 32,158 1,064 94 33,203 1,101 5439 1132.5 172 27,573 923 170 28,479 961 5610 1207.5 389 21,248 1,571 403 21,628 1,625 5630 1282.5 366 11,829 2,990 391 12,376 3,069 5695 1348.5 200 18,233 2,285 212 19,393 2,362 5779 1405.5 141 27,878 1,959 156 29,322 2,018 5856 1462.5 175 39,625 1,888 187 41,468 1,955 5876 1519.5 283 52,009 2,497 297 54,263 2,629 6110 1582.5 232 53,261 1,594 244 55,409 1,617 6262 1651.5 158 44,398 773 161 46,086 770 6320 1720.5 140 27,531 367 143 28,556 357 6402 1789.5 102 11,881 234 104 12,323 240

NuScale Nonproprietary Table 17: Comparison of Maximum RXB Forces and Moments in Pilaster at RX4 (X=1872")

between 7P and DM Force or Moment Compared Maximum Values 7P DM Difference

(%)

P1 (Kips)

Axial 1,141 1,125

+1.4%

P2 (Kips)

EW-Shear 295 303

-2.7%

P3 (Kips)

NS-Shear 1,811 1,860

-2.6%

M1 (Kip-ft)

Torsion 389 403

-3.7%

M2 (Kip-ft)

Moment about EW Axis 53,261 55,409

-3.9%

M3 (kip-ft)

Moment about NS Axis 2,990 3,069

-2.6%

% = (7P-DM)/DM*100.

NuScale Nonproprietary Table 18: Locations in North Half of RXB for Relative Displacement Comparison Joint No.

Coordinate (inch)

Location Description X

Y Z

10974 0

873 420 On top of floor at El. 50-0, northwest corner at Gridline 1 & A 11148 420 453 420 On top of floor at El. 50-0, northwest corner of Pool Wall at Gridline 2 & B 12085 3672 453 420 On top of floor at El. 50-0, northeast corner of Pool Wall at Gridline 6 & B 12242 4092 873 420 On top of floor at El. 50-0, northeast corner at Gridline 7 & A 16947 0

873 720 On top of floor at El. 75-0, northwest corner at Gridline 1 & A 17121 420 453 720 On top of floor at El. 75-0, northwest corner of Pool Wall at Gridline 2 & B 18031 3672 453 720 On top of floor at El. 75-0, northeast corner of Pool Wall at Gridline 6 & B 18187 4092 873 720 On top of floor at El. 75-0, northeast corner at Gridline 7 & A 22832 0

873 1020 On top of floor at El. 100-0, northwest corner at Gridline 1 & A 23006 420 453 1020 On top of floor at El. 100-0, northwest corner of Pool Wall at Gridline 2 & B 23919 3672 453 1020 On top of floor at El. 100-0, northeast corner of Pool Wall at Gridline 6 & B 24076 4092 873 1020 On top of floor at El. 100-0, northeast corner at Gridline 7 & A 25509 0

873 1320 On top of floor at El. 125-0, northwest corner at Gridline 1 & A 25569 420 453 1320 On top of floor at El. 125-0, northwest corner of Pool Wall at Gridline 2 & B 26345 3672 453 1320 On top of floor at El. 125-0, northeast corner of Pool Wall at Gridline 6 & B 26471 4092 873 1320 On top of floor at El. 125-0, northeast corner at Gridline 7 & A 27489 0

873 1548 Northwest corner at Gridline 1 & A at El.

145-6 27664 2019.5 453 1548 Center of south crane slab at El. 145-6 27922 4092 873 1548 Northeast corner at Gridline 7 & A at El.

145-6 29098 0

873 1824 Northwest corner at Gridline 1 & A at El.

163-0

NuScale Nonproprietary Table 18: Locations in North Half of RXB for Relative Displacement Comparison 29365 4092 873 1824 Northeast corner at Gridline 7 & A at El.

163-0 947 2019.5 88.5 0

Reference node near the center of basemat bottom

NuScale Nonproprietary Table 19: Comparison of RXB Relative Displacements between 7P and DM Node No.

Coordinate 7P DM X

(inch)

Y (inch)

Z (inch)

X-DIS (inch)

Y-DIS (inch)

Z-DIS (inch)

X-DIS (inch)

Y-DIS (inch)

Z-DIS (inch) 10974 0

873 420 0.06 0.11 0.19 0.06 0.10 0.15 11148 420 453 420 0.05 0.10 0.08 0.05 0.09 0.07 12085 3672 453 420 0.06 0.12 0.10 0.06 0.11 0.10 12242 4092 873 420 0.06 0.13 0.20 0.06 0.11 0.17 16947 0

873 720 0.11 0.24 0.25 0.10 0.22 0.22 17121 420 453 720 0.10 0.20 0.09 0.10 0.18 0.08 18031 3672 453 720 0.12 0.24 0.13 0.12 0.22 0.13 18187 4092 873 720 0.11 0.23 0.24 0.11 0.21 0.22 22832 0

873 1020 0.16 0.45 0.32 0.16 0.44 0.29 23006 420 453 1020 0.15 0.35 0.10 0.15 0.34 0.09 23919 3672 453 1020 0.17 0.39 0.15 0.17 0.37 0.15 24076 4092 873 1020 0.18 0.37 0.29 0.18 0.35 0.27 25509 0

873 1320 0.21 0.76 0.36 0.21 0.74 0.34 25569 420 453 1320 0.20 0.95 0.10 0.20 0.94 0.08 26345 3672 453 1320 0.23 0.58 0.16 0.23 0.56 0.15 26471 4092 873 1320 0.25 0.54 0.33 0.25 0.51 0.31 27489 0

873 1548 0.26 0.95 0.37 0.26 0.93 0.35 27664 2019.5 453 1548 0.22 1.61 0.05 0.22 1.64 0.05 27922 4092 873 1548 0.30 0.66 0.35 0.30 0.63 0.33 29098 0

873 1824 0.34 1.13 0.38 0.34 1.11 0.36 29365 4092 873 1824 0.37 0.80 0.36 0.38 0.77 0.34

NuScale Nonproprietary Table 20: Comparison of Maximum Seismic Out-of-Plane Shear Forces and Moments in CRB Exterior Walls

NuScale Nonproprietary Table 21: 7P and DM Seismic Forces in 4B Pilaster at Y=23' in CRB East Wall

NuScale Nonproprietary Table 22: 7P and DM Seismic Moments in 4B Pilaster at Y=23' in CRB East Wall

NuScale Nonproprietary Table 23: 7P and DM Seismic Forces in 4E Pilaster at SE Corner of CRB Exterior Walls Table 24: 7P and DM Seismic Moments in 4E Pilaster at SE Corner of CRB Exterior Walls

NuScale Nonproprietary Table 25: Selected CRB Locations for Relative Displacement Comparison Table 26: Relative Displacement at Critical Locations of Standalone CRB Model

NuScale Nonproprietary Table 27: Total Vertical Seismic CRB Base Reactions

NuScale Nonproprietary Figure 1: RXB Basemat Solid Elements and Shell Elements of Exterior Wall next to Basemat

NuScale Nonproprietary Figure 2: North Exterior Wall Vertical Strips between Column Lines RX3 and RX4 and at RX4

NuScale Nonproprietary Figure 3: Selected Shell Elements in North Pool Wall near RXM1 Lug Support

NuScale Nonproprietary Figure 4: Pilasters at Column Lines RX1 and RX4 Selected for Force and Moment Comparison

NuScale Nonproprietary Figure 5: Locations Selected for RXB Relative Displacement Calculation

NuScale Nonproprietary Figure 6: Beam Elements of Two Selected Pilasters in CRB East Wall for Force and Moment Comparison

NuScale Nonproprietary Figure 7: Locations Selected for CRB Relative Displacement Comparison Impact on DCA:

FSAR Tier 2, Section 3.7.2 has been revised as described in the response above and as shown in the markup provided in this response.

NuScale Final Safety Analysis Report Seismic Design Tier 2 3.7-112 Draft Revision 2 Comparisons between the DM and 7P ESM have been performed for the CRB and RXB. ISRS and transfer functions have been generated from both methods and compared.

RAI 03.07.02-4 The ISRS calculated by the CRB 7P model are very close to those calculated by the DM model. There are some increases found in several ISRS. A direct comparison with the DCA ISRS cannot be provided due to differences in the structural damping values used in the CRB ISRS generation model (4%

structural damping) and the CRB design model (7% structural damping).

RAI 03.07.02-4 However, the ISRS generated at 7% structural damping for 7P and DM produced results that are within 15% of each other. Most corresponding values from each model are the same.

RAI 03.07.02-4 The transfer function shapes calculated by the CRB 7P model are nearly identical to those calculated by DM, with the exception of a few peak values.

No spurious peaks are found in the transfer functions.

RAI 03.07.02-4S1 Additionally, forces, moments, and displacements in the CRB exterior walls from both methods are compared. These results are within 10% of each other.

See Table 3.7.2-46 and Table 3.7.2-44.

RAI 03.07.02-4 To use the direct method for the SASSI SSI analysis of the full RXB model, the number of required interaction nodes (28,830) exceeds the SASSI2010 program limit of 20,000. Therefore, a half model was used to obtain the results by the DM.

RAI 03.07.02-4, RAI 03.07.02-4S1 The ISRS calculated by the RXB 7P model are also within 15% of those calculated by the DM model. Similar to the CRB, the transfer function shapes show excellent agreement between 7P and DM, except at a few peak values. At some limited locations in the model, large differences are observed at specific frequencies which do not affect the results.

RAI 03.07.02-4 No spurious peaks are introduced in most of the RXB transfer functions.

Spurious spikes are seen in some transfer functions for both 7P and DM, but do not affect the RXB ISRS. Oftentimes, adding a frequency point or shifting the frequency close to a spike location eliminates the spurious spike.

RAI 03.07.02-4S1

NuScale Final Safety Analysis Report Seismic Design Tier 2 3.7-113 Draft Revision 2 Soil pressures, forces, moments, and displacements at key locations in the RXB are also compared between the two methods. These comparisons show that the 7P and DM differ, at most, 20% from each other. See Table 3.7.2-48, Table 3.7.2-45, and Table 3.7.2-47.

Cracked Model Stiffness For SASSI2010 analyses, the plate stiffnesses are only controlled by two input parameters. The two parameters are the Young's modulus and the plate thickness. It is not possible to reduce the bending stiffness by 50 percent for cracked concrete while preserving the axial stiffness at 100 percent for in-plane forces by modifying Young's modulus. A compromise approach is used by reducing the thickness by a factor equal to cubic root of 0.5, or 0.7937 to reduce the bending stiffness in half for the cracked concrete condition. In this approach, the uncracked axial stiffness is reduced by a factor of 0.7937.

Soil Separation A study was performed to investigate the effects of a gap forming between the RXB and the backfill soil during an earthquake.

The RXB was analyzed for Soil Type 7 with cracked concrete properties and 7 percent concrete material damping. Soil Type 7 was chosen because that is the case that produced the highest ISRS and forces and moments at the majority of the locations. Cracked concrete properties were chosen to be consistent with the use of 7 percent damping for the concrete material.

To model the soil separation, the Young's modulus of the backfill elements down to a depth of 25 (the top four layers of backfill elements) was decreased by a factor of 100.

RAI 03.07.02-6 Soil separation has negligible effect on the response of the structure. The primary point of comparison is at the NPM. The study showed that the maximum reaction force at the base of the NPMs decreased by approximately 5 percent, and the maximum reaction force at the NPM lug restraints decreased by more than 15 percent. In addition to examining the forces on the NPM, the in-structure response spectra were compared at the top of the basemat and the roof of the building. The ISRS virtually overlay each other, comparable in shape, and peak of response. Therefore, based upon the results of this study, modeling the structures as fully embedded is an acceptable design approach.The following responses and transfer functions calculated without soil separation are compared with those calculated with soil separation:

RAI 03.07.02-6 Forces at RXM Lug Supports The comparison indicates that the lug support reactions with soil separation are lower than those without soil separation. See Table 3.7.2-39.

RAI 03.07.02-6

NuScale Final Safety Analysis Report Seismic Design Tier 2 3.7-239 Draft Revision 2 RAI 03.07.02-4S1 Table 3.7.2-44: Relative Displacement at Critical Locations of Standalone CRB Model Node No.

Relative Displacements (inch) 7P DM X-Disp Y-Disp Z-Disp X-Disp Y-Disp Z-Disp 32322 0.01 0.01 0.03 0.01 0.01 0.02 34297 0.03 0.03 0.03 0.03 0.03 0.03 35463 0.03 0.03 0.01 0.03 0.03 0.01 36158 0.04 0.06 0.02 0.04 0.06 0.02 37970 0.05 0.04 0.02 0.05 0.03 0.02 38665 0.10 0.09 0.02 0.10 0.10 0.02 39083 0.11 0.11 0.04 0.11 0.12 0.04 39490 0.15 0.11 0.02 0.16 0.12 0.02 39705 0.16 0.17 0.05 0.16 0.18 0.05 39778 0.42 0.20 0.42 0.45 0.21 0.42 Maximum 0.42 0.20 0.42 0.45 0.21 0.42 Maximum displacements are found at Node 39778 at the center of the roof.

NuScale Final Safety Analysis Report Seismic Design Tier 2 3.7-240 Draft Revision 2 RAI 03.07.02-4S1 Table 3.7.2-45: Comparison of Maximum Forces and Moments in the North Pool Wall near the North Lug Support of RXM1 between 7P and DM Force or Moment Compared Description Maximum Values 7P DM Difference

(%)

Sxx (kip/ft)

In-Plane Force in the EW Direction 182 186

-2.3%

Syy (kip/ft)

In-Plane Force in the Vertical Direction 164 172

-4.9%

Sxy (kip/ft)

In-Plane Shear Force 211 221

-4.6%

Mxx (kip-ft/ft)

Bending about the Vertical Axis 326 347

-6.1%

Myy (kip-ft/ft)

Bending about EW Axis 372 393

-5.2%

Vxz (kip/ft)

Out-of-Plane Shear in the Vertical Section 214 228

-6.1%

Vyz (kip/ft)

Out-of-Plane Shear in the Horizontal (EW) Section 92 97

-4.4%

% = (7P-DM)/DM*100. A negative % indicates that the 7P value is less than the DM value The twisting moment Mxy was added to Mxx and Myy.

NuScale Final Safety Analysis Report Seismic Design Tier 2 3.7-241 Draft Revision 2 RAI 03.07.02-4S1 Table 3.7.2-46: Comparison of Maximum Seismic Out-of-Plane Shear Forces and Moments in CRB Exterior Walls Elevation No.

Elevation Centroid Z (in)

Maximums in Each Elevation (7P)

Maximums in Each Elevation (DM)

Vxz Vyz Mxx+Mxy Myy+Mxy Vxz Vyz Mxx+Mxy Myy+Mxy (kip/ft)

(kip/ft)

(kip-ft/ft)

(kip-ft/ft)

(kip/ft)

(kip/ft)

(kip-ft/ft)

(kip-ft/ft)

For the Three Rows of Wall Shell Elements above Grade 1

1220 12 7

61 21 11 7

61 23 2

1140 12 4

25 16 12 4

27 18 3

1060 14 15 45 23 15 16 44 24 Maximum Seismic Demands (above Grade) 14 15 61 23 15 16 61 24 Capacities 37 378 37 378 Wall Shell Elements below Grade 4

982.5 21 14 36 38 22 15 39 37 5

907.5 13 6

37 27 14 6

39 27 6

832.5 12 6

37 26 12 6

37 28 7

757.5 12 15 36 25 12 15 36 26 8

682.5 12 12 35 20 12 13 35 21 9

607.5 13 4

34 28 13 5

34 28 10 525.0 11 5

27 29 11 6

28 28 11 442.5 6

14 17 28 5

13 19 27 Maximum Seismic Demands (below Grade) 21 15 37 38 22 15 39 37 Capacities 84 378 84 378 Total OOP Shear Capacity = Concrete Shear Capacity + Stirrup Shear Capacity.

NuScale Final Safety Analysis Report Seismic Design Tier 2 3.7-242 Draft Revision 2 RAI 03.07.02-4S1 Table 3.7.2-47: Comparison of RXB Relative Displacements between 7P and DM Node No.

Coordinate 7P DM X

(inch)

Y (inch)

Z (inch)

X-DIS (inch)

Y-DIS (inch)

Z-DIS (inch)

X-DIS (inch)

Y-DIS (inch)

Z-DIS (inch) 10974 0

873 420 0.06 0.11 0.19 0.06 0.10 0.15 11148 420 453 420 0.05 0.10 0.08 0.05 0.09 0.07 12085 3672 453 420 0.06 0.12 0.10 0.06 0.11 0.10 12242 4092 873 420 0.06 0.13 0.20 0.06 0.11 0.17 16947 0

873 720 0.11 0.24 0.25 0.10 0.22 0.22 17121 420 453 720 0.10 0.20 0.09 0.10 0.18 0.08 18031 3672 453 720 0.12 0.24 0.13 0.12 0.22 0.13 18187 4092 873 720 0.11 0.23 0.24 0.11 0.21 0.22 22832 0

873 1020 0.16 0.45 0.32 0.16 0.44 0.29 23006 420 453 1020 0.15 0.35 0.10 0.15 0.34 0.09 23919 3672 453 1020 0.17 0.39 0.15 0.17 0.37 0.15 24076 4092 873 1020 0.18 0.37 0.29 0.18 0.35 0.27 25509 0

873 1320 0.21 0.76 0.36 0.21 0.74 0.34 25569 420 453 1320 0.20 0.95 0.10 0.20 0.94 0.08 26345 3672 453 1320 0.23 0.58 0.16 0.23 0.56 0.15 26471 4092 873 1320 0.25 0.54 0.33 0.25 0.51 0.31 27489 0

873 1548 0.26 0.95 0.37 0.26 0.93 0.35 27664 2019.5 453 1548 0.22 1.61 0.05 0.22 1.64 0.05 27922 4092 873 1548 0.30 0.66 0.35 0.30 0.63 0.33 29098 0

873 1824 0.34 1.13 0.38 0.34 1.11 0.36 29365 4092 873 1824 0.37 0.80 0.36 0.38 0.77 0.34

NuScale Final Safety Analysis Report Seismic Design Tier 2 3.7-243 Draft Revision 2 RAI 03.07.02-4S1 Table 3.7.2-48: North RXB Wall Soil Pressure Comparison Soil Layer Centroidal Z (inch) 7P DM Soil Pressure (ksf)

Soil Pressure (ksf) 907.5 2.4 2.6 832.5 3.9 3.9 757.5 8.0 8.1 682.5 6.8 6.8 607.5 5.3 5.7 532.5 5.3 5.2 457.5 4.3 4.7 382.5 4.5 4.4 307.5 3.6 3.0