ML18004B981

LLC Supplemental Response to NRC Request for Additional Information No. 137 (Erai No. 8973) on the NuScale Design Certification Application

ML18004B981
Person / Time
Site:	NuScale
Issue date:	01/04/2018
From:	Rad Z NuScale
To:	Document Control Desk, Office of New Reactors
References
RAIO-0118-58031
Download: ML18004B981 (4)

Text

RAIO-0118-58031 January 04, 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. 137 (eRAI No. 8973) on the NuScale Design Certification Application

REFERENCES:

1. U.S. Nuclear Regulatory Commission, "Request for Additional Information No. 137 (eRAI No. 8973)," dated August 05, 2017

2. NuScale Power, LLC Response to NRC "Request for Additional Information No. 137 (eRAI No.8973)," dated October 03, 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. 8973:

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

mbryan@nuscalepower.com.

Sincerely, Za Z ckary W. Rad Zackary Director Director, Reg lator Affairs Regulatory 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. 8973 NuScale Power, LLC 1100 NE Circle Blvd., Suite 200 Corvalis, Oregon 97330, Office: 541.360.0500, Fax: 541.207.3928 www.nuscalepower.com

RAIO-0118-58031 :

NuScale Supplemental Response to NRC Request for Additional Information eRAI No. 8973 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.: 8973 Date of RAI Issue: 08/05/2017 NRC Question No.: 03.08.04-19 10 CFR 50, Appendix A, GDC 1, 2, and 4, provide 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 seismic Category I structures, other than the containment.

The section views in Figures 3B-14 and 3B-42 show wall portions that do not appear to be

included in the SAP model section views in Figures 3B-15 and 3B-43, respectively. Clarify

and/or correct the inconsistencies between these figures, as applicable.

NuScale Response:

Based on a public meeting with the NRC Staff on November 29, 2017, NuScale is supplementing the original response to RAI Question 03.08.04-19 to provide a description of the seismic input, analysis, and design process for partition walls.

The reactor building (RXB) has several interior steel partition walls and slabs that are not part of the main lateral force resisting system. These walls and roofs are designed as steel box type structure filled with nonstructural fill concrete to provide radiation protection. The majority of equipment rooms in the RXB consist of partition walls and roofs. Each wall is welded to floor embed plates. The vertical sides and top of the partition walls are laterally supported by angle supports to transfer lateral loads only. In other words, the partition walls are fixed at the base and pin supported on three or two sides.

The two basic configurations are two steel plates welded to hollow structured section (HSS) tubes. The cover plate is fabricated from A36 steel and the HSS tubes are fabricated from A500, Gr B, Fy = 46 ksi steel. The various cells in the walls are filled with normal weight concrete which provides the major portion of the shielding. The base of the walls are welded to a base plate which is in turn welded to steel embedded plates. Where the sides of the partition walls are connected to the major walls, there is a gap to isolate them. There is also a gap at the top to NuScale Nonproprietary

isolate them from the concrete slab above. Along the sides and top, the partition walls are

connected to the major walls and floor slab by steel angles. Fillet welds attach the angles to the

partition walls and embeds in the major walls and floor slabs. The steel plates are attached to

the HSS tubes by fillets welds inside an opening in the steel plate. The HSS tubes are orientHd

vertically. In some locations, there are intermediate roof slabs. These slabs have the same

basic construction with the tubes. The orientation of the tubes depends on the spans and the

connection to the supporting walls. The partition walls are anchored to the floor slabs located at

top of concrete (TOC) elevations 24-0, 50-0, 75-0, 100-0 and 126- 0 in the gallery areas

at North, South, and East and West sides of the RXB. The anchorages for the partition walls are

cast-in place anchors that are comprised of embedded plates with Nelson studs.

Due to the complexity of the steel partition configuration, a local SAP2000 model of the steel

partitions was created to obtain the demands for designing the steel partitions and the

anchorages of the steel partitions. The walls and slabs are modeled with thick shell elements.

The HSS members are modeled explicitly with beam elements. The nodes along the bottom

boundary are fixed in all degrees of freedom since anchor bolts will be used along the bottom

boundary. The nodes along the west edges of the walls are restrained only in the transverse (North-South) direction. The nodes along the west edge of the slab are restrained only in the

vertical direction.

The loadings on the steel partition walls consist of the self-weight and an additional 50 psf on

the slabs. For the seismic loading, a response spectrum analysis was performed. The response

spectra input used was the CSDRS 4% damped floor response spectra at Elevation 100'. A

review of the partition walls indicated the walls on Elevation 100' between Grid Lines RX-B, RX-D, RX-6 and RX-7 have a longer vertical span than other locations and represented a bounding

case. Also, the steel partitions at this elevation will have higher loadings from the in-structure

response spectra (ISRS) than the partitions at the lower elevations.

Demand loads for the design of the steel partitions are obtained directly from the SAP2000 local

model. Nodal reactions from the SAP2000 local model analysis were used to design the wall

connections. The steel partition walls and slabs were designed using provisions in the AISC

14th edition steel construction manual. The design of the steel partition anchorages was based

on Appendix D of the code ACI 349-06 and the guide ACI 349.2R-07.

Impact on DCA:

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

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