ML18339A031

LLC Response to NRC Request for Additional Information No. 151 (Erai No. 8974) on the NuScale Design Certification Application

ML18339A031
Person / Time
Site:	NuScale
Issue date:	12/05/2018
From:	Fosaaen C NuScale
To:	Document Control Desk, Office of New Reactors
References
RAIO-1218-63717
Download: ML18339A031 (7)

Text

RAIO-1218-63717 December 05, 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 Response to NRC Request for Additional Information No.

151 (eRAI No. 8974) on the NuScale Design Certification Application

REFERENCES:

1. U.S. Nuclear Regulatory Commission, "Request for Additional Information No. 151 (eRAI No. 8974)," dated August 05, 2017

2. NuScale Power, LLC Response to NRC "Request for Additional Information No. 151 (eRAI No.8974)," dated October 3, 2017 The purpose of this letter is to provide the NuScale Power, LLC (NuScale) response to the referenced NRC Request for Additional Information (RAI).

The Enclosure to this letter contains NuScale's response to the following RAI Question from NRC eRAI No. 8974:

03.08.04-20 The response to RAI Questions 03.08.04-21, 03.08.04-22, and 03.08.04-23 were previously provided in Reference 2. This completes all responses to eRAI 8974.

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, Carrie Fosaaen Supervisor, Licensing NuScale Power, LLC Distribution: Gregory Cranston, NRC, OWFN-8G9A Samuel Lee, NRC, OWFN-8G9A Marieliz Vera, NRC, OWFN-8G9A : NuScale Response to NRC Request for Additional Information eRAI No. 8974 NuScale Power, LLC 1100 NE Circle Blvd., Suite 200 Corvalis, Oregon 97330, Office: 541.360.0500, Fax: 541.207.3928 www.nuscalepower.com

RAIO-1218-63717 :

NuScale Response to NRC Request for Additional Information eRAI No. 8974 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.: 8974 Date of RAI Issue: 08/05/2017 NRC Question No.: 03.08.04-20 10 CFR 50, Appendix A, GDC 1, 2, and 4 provides requirements to be met by SSC important to safety. In accordance with these requirements, DSRS Section 3.8.4 provides review guidance pertaining to the design of important to safety seismic Category I structures, other than the containment. Consistent with DSRS Section 3.8.4, the staff reviews, in part, loads and loading combinations.

Provide the magnitude of bounding seismic design forces of the roof in the three orthogonal directions (North-South, East-West, and Vertical).

NuScale Response:

An element-by-element design check is performed to show that roof capacities are adequate to withstand the design loads. Based on the locations of the maximum combined moment and shear resultants (static + dynamic), five critical locations were selected for evaluating the roof.

These sections are shown in Figure 1.

The maximum seismic forces and moments for these elements are provided in Table 1. The variables are defined as follows and shown in Figure 2:

• Sxx = membrane forces in the x direction (east/west)

• Syy = membrane forces in the y direction (north/south)

NuScale Nonproprietary

• Sxy = in-plane shear

• Mxx + Mxy = out-of-plane moment about the x axis

• Myy + Mxy = out-of-plane moment about the y axis

• Vxz, Vyz = out-of-plane shear Roof Section 3 failed in in-plane shear, so the section evaluated was extended to the whole width (Figure 3) and averaging calculations are provided to show adequacy (Table 2).

FSAR markups for the roof will be provided as part of the response to RAI 8971 Question 03.08.04-11.

Figure 1. SAP2000 Roof Elements Showing Critical Locations for Evaluation NuScale Nonproprietary

Figure 2. SASSI2010 Membrane, Shear Force and Bending Moment Definitions NuScale Nonproprietary

Table 1. Seismic Forces and Moments for Select Roof Elements Location Element Membrane Force Bending Moment Resultants Shear Force Resultants (lb/in) (lb-in/in) Resultants (lb/in)

Sxx Syy Sxy Mxx Myy Mxy Vxz Vyz 1 17,383 2,808 8,157 13,927 69,950 79,748 19,605 2,285 3,600 17,677 8,474 9,292 15,602 100,778 64,621 23,704 2,317 677 17,825 8,765 8,102 14,699 69,998 44,317 31,568 1,496 607 2 18,011 13,450 2,906 4,345 43,788 217,097 24,741 188 1,257 18,013 12,862 2,531 4,879 42,525 223,089 16,862 173 1,259 18,015 12,411 2,389 5,496 41,504 224,891 12,548 160 1,259 3 18,082 1,571 5,176 22,150 154,381 27,178 27,178 932 370 18,083 3,409 5,410 23,049 213,703 45,481 45,481 2,009 1,774 18,084 3,409 4,909 23,637 213,779 60,299 60,299 2,012 1,974 4 18,399 14,880 3,947 4,898 85,956 85,956 459,354 613 3,344 18,413 14,530 3,956 4,590 84,628 460,682 34,407 603 3,313 18,427 13,158 3,623 4,557 71,337 428,991 428,991 496 2,730 5 18,448 1,976 2,443 5,302 120,449 382,733 382,733 666 836 18,462 2,006 2,398 5,913 120,415 381,276 381,276 607 835 18,476 2,049 2,355 6,461 123,039 380,982 380,982 504 825 Figure 3. SAP2000 Roof Elements Showing West Edge at Location 3 for In-Plane Shear Evaluation NuScale Nonproprietary

Table 2. Final Evaluation at West Edge of Roof at Location 3.

Element Length Thickness Shell IP Shear fc' IP Shear Capacity (in) (in) Sxy Demand (psi) 8Acvfc (kip/in) (kip) (kip) 17265 95.9 48 6.94 665 5,000 1,953 17583 95.7 48 9.21 881 5,000 1,949 17731 86.5 48 9.88 854 5,000 1,761 17957 92.6 48 10.55 977 5,000 1,886 18077 84 48 15.46 1,299 5,000 1,711 18078 93 48 18.10 1,683 5,000 1,894 18079 81 48 19.88 1,610 5,000 1,650 18080 51 48 20.94 1,068 5,000 1,039 18081 51 48 21.46 1,095 5,000 1,039 18082 88.5 48 22.53 1,994 5,000 1,802 18083 88.5 48 23.87 2,113 5,000 1,802 18084 88.5 48 24.25 2,146 5,000 1,802 18085 88.5 48 24.01 2,124 5,000 1,802 18086 51 48 23.69 1,208 5,000 1,039 18087 51 48 23.28 1,187 5,000 1,039 18088 81 48 22.33 1,809 5,000 1,650 18089 93 48 20.35 1,893 5,000 1,894 18090 84 48 17.14 1,439 5,000 1,711 17958 92.6 48 12.22 1,132 5,000 1,886 17732 86.5 48 11.54 998 5,000 1,761 17584 95.7 48 9.95 952 5,000 1,949 17266 95.9 48 6.81 653 5,000 1,953 Sum = 29,781 < 36,968 Impact on DCA:

There are no impacts to the DCA as a result of this response.

NuScale Nonproprietary