ML18093B061
| ML18093B061 | |
| Person / Time | |
|---|---|
| Site: | NuScale |
| Issue date: | 04/03/2018 |
| From: | Rad Z NuScale |
| To: | Document Control Desk, Office of New Reactors |
| References | |
| RAIO-0418-59373 | |
| Download: ML18093B061 (91) | |
Text
RAIO-0418-59373 April 03, 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
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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 03.07.02-1 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.
y, Sincerely, Za Zackary W. Rad Director Regulatory Affairs
- Director, NuScale Power, LLC Distribution: Omid Tabatabai, NRC, OWFN-8G9A Samuel Lee, NRC, OWFN-8G9A
Prosanta Chowdhury NRC, OWFN-8G9A : NuScale Supplemental Response to NRC Request for Additional Information eRAI No. 8932 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 Power, LLC 1100 NE Circle Blvd., Suite 200 Corvalis, Oregon 97330, Office: 541.360.0500, Fax: 541.207.3928 www.nuscalepower.com
Response to Request for Additional Information Docket No.52-048 eRAI No.: 8932 Date of RAI Issue: 07/30/2017 NRC Question No.: 03.07.02-1 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.
In modeling structures using finite elements for dynamic analysis, the discretization should be
adequately refined to sufficiently capture the frequency contents of the ground motion in the
structural response. DSRS Section 3.7.2 provides a guideline that the element mesh size
should be selected on the basis that further refinement has only a negligible effect on the
solution results. For the RXB and CRB standalone models as well as the triple building model,
the applicant is requested to provide a detailed explanation for why the finite elements
employed in the models are adequate. Include discussion of applicants consideration of the
effects of element size, shape, and aspect ratio of each structural system and their impact on
solution accuracy.
NuScale Response:
As discussed with the Staff in a public meeting on January 30, 2018, NuScale is supplementing the response to eRAI 8932, question 03.07.02-1, as originally provided in a letter dated December 21, 2017.
- a. In order to further demonstrate the effects of mesh refinement on both the reactor building (RXB) and the control building (CRB), additional studies were performed by comparisons of in-structure response spectras (ISRSs) at 4% damping at key selected locations in each structure using the CSDRS compatible Capitola ground motions and the CSRS-HF compatible Lucerne ground motions.
For the cracked RXB Capitola and Lucerne time history ISRS comparisons, a total of 10 nodes were selected to show the effects of further mesh refinements. The ten (10) nodes consisted of four(4) corner nodes compared in the X and Y directions, two (2)
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intermediate nodes in the North and South outer walls compared in the X and Y directions, two (2) intermediate nodes in the East and West outer walls compared in the X and Y directions, and two (2) interior nodes in the slabs at elevation 50-0 and 100- 0 compared in the X,Y and Z directions. The cracked stand alone SAP2000 model (DCA model) to refined mesh model comparisons showed very close correlation of resulting ISRS curves and thus minimal impact from further meshing.
The X, Y, and Z coordinates and location description of the selected locations for the ISRS generation are tabulated in Table 1 for the Capitola time history and Table 2 for the Lucerne time history. A 4% damping ratio is used to calculate ISRS. Figure 1 through Figure 4 show the location of the joints used to present the ISRS.
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Figure 1: Outer Wall and Corner ISRS Joint Locations, from Southwest Point of View NuScale Nonproprietary
Figure 2: Outer Wall and Corner ISRS Joint Locations, from Northeast Point of View NuScale Nonproprietary
Figure 3: El. 50'-0" ISRS Joint Location Figure 4: El. 100'-0" ISRS Joint Location NuScale Nonproprietary
The selected locations for ISRS using the Capitola time history are presented in Table 1. For joints at the corners of the RXB, ISRS in the X and Y directions are presented. For joints in the north and south outer walls, ISRS in the Y direction are presented. For joints in the east and west outer walls, ISRS in the X direction are presented. For joints on the slabs, ISRS in all three directions are presented. These corresponding plots are shown in Figure 5 through Figure 22.
Table 1: Locations Selected for Capitola ISRS Comparison Location X (East) Y (North) Z (Vert)
Node. No. Figure No. Description No. (in) (in) (in)
Corner Joints of the Building Figure 5 (X) Southwest Corner at Roof 1 29076 0 -873 1824 Figure 6 (Y) Level Figure 7 (X) Northwest Corner at Roof 2 29098 0 873 1824 Figure 8 (Y) Level Figure 9 (X) Southeast Corner at Roof 3 29343 4092 -873 1824 Figure 10 (Y) Level Figure 11 (X) Northeast Corner at Roof 4 29365 4092 873 1824 Figure 12 (Y) Level Intermediate Joints on the North and South Outer Walls Intermediate Joint on 5 26980 2314.5 -873 1434 Figure 13 (Y)
South Wall Intermediate Joint on 6 26985 2314.5 873 1434 Figure 14 (Y)
North Wall Intermediate Joints on the East and West Outer Walls Intermediate Joint on 7 26811 0 -228 1434 Figure 15 (X)
West Wall Intermediate Joint on East 8 27125 4092 -228 1434 Figure 16 (X)
Wall Joints on the Slabs Figure 17 (X) 9 11469 1666 -705 420 Figure 18 (Y) Joint on Slab at El. 50'-0" Figure 19 (Z)
Figure 20 (X)
Joint on Slab at El.
10 23313 1666 -705 1020 Figure 21 (Y) 100'-0" Figure 22 (Z)
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Figure 5: Cracked X-ISRS due to Capitola Input at Node 29076 at Southwest Corner at Roof Level NuScale Nonproprietary
Figure 6: Cracked Y-ISRS due to Capitola Input at Node 29076 at Southwest Corner at Roof Level NuScale Nonproprietary
Figure 7: Cracked X-ISRS due to Capitola Input at Node 29098 at Northwest Corner at Roof Level NuScale Nonproprietary
Figure 8: Cracked Y-ISRS due to Capitola Input at Node 29098 at Northwest Corner at Roof Level NuScale Nonproprietary
Figure 9: Cracked X-ISRS due to Capitola Input at Node 29343 at Southeast Corner at Roof Level NuScale Nonproprietary
Figure 10: Cracked Y-ISRS due to Capitola Input at Node 29343 at Southeast Corner at Roof Level NuScale Nonproprietary
Figure 11: Cracked X-ISRS due to Capitola Input at Node 29365 at Northeast Corner at Roof Level NuScale Nonproprietary
Figure 12: Cracked Y-ISRS due to Capitola Input at Node 29365 at Northeast Corner at Roof Level NuScale Nonproprietary
Figure 13: Cracked Y-ISRS due to Capitola Input at Node 26980 at Intermediate Joint on South Wall NuScale Nonproprietary
Figure 14: Cracked Y-ISRS due to Capitola Input at Node 26985 at Intermediate Joint on North Wall NuScale Nonproprietary
Figure 15: Cracked X-ISRS due to Capitola Input at Node 26811 at Intermediate Joint on West Wall.
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Figure 16: Cracked X-ISRS due to Capitola Input at Node 27125 at Intermediate Joint on East Wall.
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Figure 17: Cracked X-ISRS due to Capitola Input at Node 11469 at Joint on Slab at El.
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Figure 18: Cracked Y-ISRS due to Capitola Input at Node 11469 at Joint on Slab at El.
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Figure 19: Cracked Z-ISRS due to Capitola Input at Node 11469 at Joint on Slab at El.
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Figure 20: Cracked X-ISRS due to Capitola Input at Node 23313 at Joint on Slab at El.
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Figure 21: Cracked Y-ISRS due to Capitola Input at Node 23313 at Joint on Slab at El.
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Figure 22: Cracked Z-ISRS due to Capitola Input at Node 23313 at Joint on Slab at El.
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The selected locations for ISRS using the Lucerne time history are presented in Table 2. For joints at the corners of the RXB, ISRS in the X and Y directions are presented. For joints in the north and south outer walls, ISRS in the Y direction are presented. For joints in the east and west outer walls, ISRS in the X direction are presented. For joints on the slabs, ISRS in all three directions are presented. These corresponding plots are shown in Figure 23 through Figure 40.
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Table 2: Locations Selected for Lucerne ISRS Comparison Location X Y (North) Z (Vert)
Node No. Figure No. Description No. (East) (in) (in) (in)
Corner Joints of the Building Figure 23 (X) Southwest Corner at Roof 1 29076 0 -873 1824 Figure 24 (Y) Level Figure 25 (X) Northwest Corner at Roof 2 29098 0 873 1824 Figure 26 (Y) Level Figure 27 (X) Southeast Corner at Roof 3 29343 4092 -873 1824 Figure 28 (Y) Level Figure 29 (X) Northeast Corner at Roof 4 29365 4092 873 1824 Figure 30 (Y) Level Intermediate Joints on the North and South Outer Walls Intermediate Joint on 5 26980 2314.5 -873 1434 Figure 31 (Y)
South Wall Intermediate Joint on 6 26985 2314.5 873 1434 Figure 32 (Y)
North Wall Intermediate Joints on the East and West Outer Walls Intermediate Joint on 7 26811 0 -228 1434 Figure 33 (X)
West Wall Intermediate Joint on 8 27125 4092 -228 1434 Figure 34 (X)
East Wall Joints on the Slabs Figure 35 (X) 9 11469 1666 -705 420 Figure 36 (Y) Joint on Slab at El. 50'-0" Figure 37 (Z)
Figure 38 (X)
Joint on Slab at El.
10 23313 1666 -705 1020 Figure 39 (Y) 100'-0" Figure 40 (Z)
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Figure 23: Cracked X-ISRS due to Lucerne Input at Node 29076 at Southwest Corner at Roof Level NuScale Nonproprietary
Figure 24: Cracked Y-ISRS due to Lucerne Input at Node 29076 at Southwest Corner at Roof Level NuScale Nonproprietary
Figure 25: Cracked X-ISRS due to Lucerne Input at Node 29098 at Northwest Corner at Roof Level NuScale Nonproprietary
Figure 26: Cracked Y-ISRS due to Lucerne Input at Node 29098 at Northwest Corner at Roof Level NuScale Nonproprietary
Figure 27: Cracked X-ISRS due to Lucerne Input at Node 29343 at Southeast Corner at Roof Level NuScale Nonproprietary
Figure 28: Cracked Y-ISRS due to Lucerne Input at Node 29343 at Southeast Corner at Roof Level NuScale Nonproprietary
Figure 29: Cracked X-ISRS due to Lucerne Input at Node 29365 at Northeast Corner at Roof Level NuScale Nonproprietary
Figure 30: Cracked Y-ISRS due to Lucerne Input at Node 29365 at Northeast Corner at Roof Level NuScale Nonproprietary
Figure 31: Cracked Y-ISRS due to Lucerne Input at Node 26980 at Intermediate Joint on South Wall NuScale Nonproprietary
Figure 32: Cracked Y-ISRS due to Lucerne Input at Node 26985 at Intermediate Joint on North Wall NuScale Nonproprietary
Figure 33: Cracked X-ISRS due to Lucerne Input at Node 26811 at Intermediate Joint on West Wall NuScale Nonproprietary
Figure 34: Cracked X-ISRS due to Lucerne Input at Node 27125 at Intermediate Joint on East Wall NuScale Nonproprietary
Figure 35: Cracked X-ISRS due to Lucerne Input at Node 11469 at Joint on Slab at El.
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Figure 36: Cracked Y-ISRS due to Lucerne Input at Node 11469 at Joint on Slab at El.
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Figure 37: Cracked Z-ISRS due to Lucerne Input at Node 11469 at Joint on Slab at El.
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Figure 38: Cracked X-ISRS due to Lucerne Input at Node 23313 at Joint on Slab at El.
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Figure 39: Cracked Y-ISRS due to Lucerne Input at Node 23313 at Joint on Slab at El.
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Figure 40: Cracked Z-ISRS due to Lucerne Input at Node 23313 at Joint on Slab at El.
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For the cracked Control Building Capitola and Lucerne time history ISRS comparisons, a total of 10 nodes were selected to show the effects of further mesh refinements. The ten (10) nodes consisted of four(4) corner nodes compared in the X and Y directions, two (2) intermediate nodes in the North and South outer walls compared in the X and Y directions, two (2) intermediate nodes in the East and West outer walls compared in the X and Y directions, and two (2) interior nodes in the slabs at elevation 50-0 and 100- 0 compared in the X,Y and Z directions. The cracked DCA model to refined mesh model comparisons showed very close correlation of resulting ISRS curves and thus minimal impact from further meshing.
The X, Y, and Z coordinates and location description of the selected locations for the ISRS generation are tabulated in Table 3 for the Capitola time history and Table 4 for the Lucerne time history. A 4% damping ratio is used to calculate ISRS. Figure 41 through Figure 44 show the location of the joints used to present the ISRS.
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Figure 41: Outer Wall and Corner ISRS Joint Locations, from Southwest Point of View NuScale Nonproprietary
Figure 42: Outer Wall and Corner ISRS Joint Locations, from Northeast Point of View NuScale Nonproprietary
Figure 43: El. 100'-0" ISRS Joint Location NuScale Nonproprietary
Figure 44: El. 120'-0" ISRS Joint Location NuScale Nonproprietary
The selected locations for ISRS using the Capitola time history are presented in Table 3. For joints at the corners of the CRB, ISRS in the X and Y directions are presented. For joints in the north and south outer walls, ISRS in the Y direction are presented. For joints in the east and west outer walls, ISRS in the X direction are presented. For joints on the slabs, ISRS in all three directions are presented. These corresponding plots are shown in Figure 45 to Figure 62.
Table 3: Locations Selected for Capitola ISRS Comparison Location X Y (North) Z (Vert)
Node No. Figure No. Description No. (East) (in) (in) (in)
Corner Joints of the Building Figure 45 (X) Southwest Corner at Roof 1 39082 4500 -700 1260 Figure 46 (Y) Level Figure 47 (X) Northwest Corner at Roof 2 39105 4500 700 1260 Figure 48 (Y) Level Figure 49 (X) Southeast Corner at Roof 3 39477 5436 -700 1260 Figure 50 (Y) Level Figure 51 (X) Northeast Corner at Roof 4 39500 5436 700 1260 Figure 52 (Y) Level Intermediate Joints on the North and South Outer Walls Intermediate Joint on 5 38875 5154 -700 1100 Figure 53 (Y)
South Wall Intermediate Joint on 6 38896 5154 700 1100 Figure 54 (Y)
North Wall Intermediate Joints on the East and West Outer Walls Intermediate Joint on 7 38821 4500 58.5 1100 Figure 55 (X)
West Wall Intermediate Joint on 8 38934 5436 58.5 1100 Figure 56 (X)
East Wall Joints on the Slabs Figure 57 (X)
Joint on Slab at El.
9 38328 4868 178 1020 Figure 58 (Y) 100'-0" Figure 59 (Z)
Figure 60 (X)
Joint on Slab at El.
10 39241 4868 178 1260 Figure 61 (Y) 120'-0" Figure 62 (Z)
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Figure 45: Cracked X-ISRS due to Capitola Input at Node 39082 at Southwest Corner at Roof Level NuScale Nonproprietary
Figure 46: Cracked Y-ISRS due to Capitola Input at Node 39082 at Southwest Corner at Roof Level NuScale Nonproprietary
Figure 47: Cracked X-ISRS due to Capitola Input at Node 39105 at Northwest Corner at Roof Level NuScale Nonproprietary
Figure 48: Cracked Y-ISRS due to Capitola Input at Node 39105 at Northwest Corner at Roof Level NuScale Nonproprietary
Figure 49: Cracked X-ISRS due to Capitola Input at Node 39477 at Southeast Corner at Roof Level NuScale Nonproprietary
Figure 50: Cracked Y-ISRS due to Capitola Input at Node 39477 at Southeast Corner at Roof Level NuScale Nonproprietary
Figure 51: Cracked X-ISRS due to Capitola Input at Node 39500 at Northeast Corner at Roof Level NuScale Nonproprietary
Figure 52: Cracked Y-ISRS due to Capitola Input at Node 39500 at Northeast Corner at Roof Level NuScale Nonproprietary
Figure 53: Cracked Y-ISRS due to Capitola Input at Node 38875 at Intermediate Joint on South Wall NuScale Nonproprietary
Figure 54: Cracked Y-ISRS due to Capitola Input at Node 38896 at Intermediate Joint on North Wall NuScale Nonproprietary
Figure 55: Cracked X-ISRS due to Capitola Input at Node 38821 at Intermediate Joint on West Wall NuScale Nonproprietary
Figure 56: Cracked X-ISRS due to Capitola Input at Node 38934 at Intermediate Joint on East Wall NuScale Nonproprietary
Figure 57: Cracked X-ISRS due to Capitola Input at Node 38328 at El. 100'-0" Slab NuScale Nonproprietary
Figure 58: Cracked Y-ISRS due to Capitola Input at Node 38328 at El. 100'-0" Slab NuScale Nonproprietary
Figure 59: Cracked Z-ISRS due to Capitola Input at Node 38328 at El. 100'-0" Slab NuScale Nonproprietary
Figure 60: Cracked X-ISRS due to Capitola Input at Node 39241 at El. 120'-0" Slab NuScale Nonproprietary
Figure 61: Cracked Y-ISRS due to Capitola Input at Node 39241 at El. 120'-0" Slab NuScale Nonproprietary
Figure 62: Cracked Z-ISRS due to Capitola Input at Node 39241 at El. 120'-0" Slab NuScale Nonproprietary
The selected locations for ISRS using the Lucerne time history are presented in Table 4. For joints at the corners of the CRB, ISRS in the X and Y directions are presented. For joints in the north and south outer walls, ISRS in the Y direction are presented. For joints in the east and west outer walls, ISRS in the X direction are presented. For joints on the slabs, ISRS in all three directions are presented. These corresponding plots are shown in Figure 63 to Figure 80.
Table 4: Locations Selected for Lucerne ISRS Comparison Location X Y (North) Z (Vert)
Node No. Figure No. Description No. (East) (in) (in) (in)
Corner Joints of the Building Figure 63 (X) Southwest Corner at Roof 1 39082 4500 -700 1260 Figure 64 (Y) Level Figure 65 (X) Northwest Corner at Roof 2 39105 4500 700 1260 Figure 66 (Y) Level Figure 67 (X) Southeast Corner at Roof 3 39477 5436 -700 1260 Figure 68 (Y) Level Figure 69 (X) Northeast Corner at Roof 4 39500 5436 700 1260 Figure 70 (Y) Level Intermediate Joints on the North and South Outer Walls Intermediate Joint on 5 38875 5154 -700 1100 Figure 71 (Y)
South Wall Intermediate Joint on 6 38896 5154 700 1100 Figure 72 (Y)
North Wall Intermediate Joints on the East and West Outer Walls Intermediate Joint on 7 38821 4500 58.5 1100 Figure 73 (X)
West Wall Intermediate Joint on 8 38934 5436 58.5 1100 Figure 74 (X)
East Wall Joints on the Slabs Figure 75 (X)
Joint on Slab at El.
9 38328 4868 178 1020 Figure 76 (Y) 100'-0" Figure 77 (Z)
Figure 78 (X)
Joint on Slab at El.
10 39241 4868 178 1260 Figure 79 (Y) 120'-0" Figure 80 (Z)
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Figure 63: Cracked X-ISRS due to Lucerne Input at Node 39082 at Southwest Corner at Roof Level NuScale Nonproprietary
Figure 64: Cracked Y-ISRS due to Lucerne Input at Node 39082 at Southwest Corner at Roof Level.
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Figure 65: Cracked X-ISRS due to Lucerne Input at Node 39105 at Northwest Corner at Roof Level NuScale Nonproprietary
Figure 66: Cracked Y-ISRS due to Lucerne Input at Node 39105 at Northwest Corner at Roof Level NuScale Nonproprietary
Figure 67: Cracked X-ISRS due to Lucerne Input at Node 39477 at Southeast Corner at Roof Level NuScale Nonproprietary
Figure 68: Cracked Y-ISRS due to Lucerne Input at Node 39477 at Southeast Corner at Roof Level NuScale Nonproprietary
Figure 69: Cracked X-ISRS due to Lucerne Input at Node 39500 at Northeast Corner at Roof Level NuScale Nonproprietary
Figure 70: Cracked Y-ISRS due to Lucerne Input at Node 39500 at Northeast Corner at Roof Level NuScale Nonproprietary
Figure 71: Cracked Y-ISRS due to Lucerne Input at Node 38875 at Intermediate Joint on South Wall NuScale Nonproprietary
Figure 72: Cracked Y-ISRS due to Lucerne Input at Node 38896 at Intermediate Joint on South Wall NuScale Nonproprietary
Figure 73: Cracked X-ISRS due to Capitola Input at Node 38821 at Intermediate Joint on West Wall NuScale Nonproprietary
Figure 74: Cracked X-ISRS due to Lucerne Input at Node 38934 at Intermediate Joint on East Wall NuScale Nonproprietary
Figure 75: Cracked X-ISRS due to Lucerne Input at Node 38328 at El. 100'-0" Slab NuScale Nonproprietary
Figure 76: Cracked Y-ISRS due to Lucerne Input at Node 38328 at El. 100'-0" Slab NuScale Nonproprietary
Figure 77: Cracked Z-ISRS due to Lucerne Input at Node 38328 at El. 100'-0" Slab NuScale Nonproprietary
Figure 78: Cracked X-ISRS due to Lucerne Input at Node 39241 at El. 120'-0" Slab NuScale Nonproprietary
Figure 79: Cracked Y-ISRS due to Lucerne Input at Node 39241 at El. 120'-0" Slab NuScale Nonproprietary
Figure 80: Cracked Z-ISRS due to Lucerne Input at Node 39241 at El. 120'-0" Slab NuScale Nonproprietary
b) For the RXB model, all frame elements were meshed accordingly to ensure connectivity with the meshed shell elements, wherever applicable. Essentially they were divided in half. The frame elements comprising the reactor modules were not sub meshed. The solid elements comprising the RXB foundation and the backfill soil were not sub meshed. This means that the soil and foundation solid elements are connected to every other joint of the shell elements comprising the walls.
For the CRB model, all frame elements were meshed accordingly to ensure connectivity with the meshed shell elements, wherever applicable. The solid elements used to model the basemat were not subdivided because it was a fixed-base analysis. The solid elements used to model the backfill soil were not subdivided because the focus of the comparison was on the response of the building.
c) The comparison of forces, moments, and ISRS, detailed in item a), show that the effects on design demand forces or equipment qualification are very minor even though there are differences between the dynamical properties of the CRB DCA model and the CRB refined model.
d) FSAR Tier 2, Section 3.7.2.1.2 has been updated to reflect the supplemented response.
Impact on DCA:
FSAR Tier 2, Section 3.7.2.1.2 has been revised as described in the response above and as shown in the markup provided in this response.
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NuScale Final Safety Analysis Report Seismic Design Minor changes in the natural frequencies and their mass participation ratios indicate that other dynamic characteristics of the building models would not change by mesh refinement. To show that mesh refinement does not have a major impact on ISRS, comparisons were made of the ISRS based on the CSDRS-compatible Capitola ground motion and the CSDRS-HF-compatible Lucerne ground motion at a few key locations. The comparisons were between the same RXB and CRB stand-alone SAP2000 model and refined mesh building models used for the other compared structural responses. Results show that mesh refinement has an insignificant effect on the ISRS.Therefore, there is no need to study the effects of the mesh refinement on the SSI, ISRS, or SSSI. The triple building model has the same mesh as the stand- alone model. Also, as it was mentioned, the SSSI effects are not expected to change with mesh refinement, therefore, no mesh sensitivity analysis was done for the triple building model.
3.7.2.1.2.1 Reactor Building The RXB houses safety-related equipment and facilities pertinent to the operation and support of the NPMs and provides anchorages and support for various SSC. The RXB is a reinforced concrete structure that is deeply embedded in soil, and supported on a 10 foot thick foundation basemat. The RXB has an outside length (excluding pilasters) of 346.0 feet in the East-West direction, a width (excluding pilasters) of 150.5 feet in the North-South direction. The dimensions between the centerlines of the outer walls are 341' 0" by 145' 6". There are five pilasters along both the north and south walls and three pilasters on the east and west walls. These pilasters are 5.0 feet wide and extend 5.0 feet out from the wall. In addition, there are four corner pilasters.
These pilasters are 12.5 feet wide and extend 2.5 feet out from the wall. The overall height is approximately 167 feet from the top of roof to the bottom of basemat. The embedment of the RXB is 86 feet. The baseline plant top of concrete (TOC) for the RXB is at Elevation (EL.) 100'-0". Although the actual site surface will be approximately 6 inches below the baseline elevation, and sloped away from the safety-related structures, "grade" is also considered to be at EL. 100'-0".
Section 1.2.2.1 contains additional discussion of the RXB and Figure 1.2-10 through Figure 1.2-20 provide elevation and section views of the building.
The predominant feature of the RXB is the ultimate heat sink (UHS) pool. This pool includes the spent fuel pool, refueling area pool, and the reactor pool. The dry dock is also assumed to be full of water and part of the UHS for the seismic analysis. This large pool occupies the center of the building and runs 80 percent of the length of the building. Although the pool and bay walls extend to the bioshields at EL. 126', the nominal top of the pool is at EL. 100'-0." The normal reactor pool water depth is maintained at 69 feet, which results in a water surface at EL. 94'-0". The reactor pool has bays to house up to twelve NPMs.
Both the NPMs and the water in the pool contribute a large amount of weight to the global mass of the RXB and thus impact the dynamic characteristics of the building.
Tier 2 3.7-113 Draft Revision 2