RAIO-0818-61581, LLC Supplemental Response to NRC Request for Additional Information No. 300 (Erai No. 9186) on the NuScale Design Certification Application

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LLC Supplemental Response to NRC Request for Additional Information No. 300 (Erai No. 9186) on the NuScale Design Certification Application
ML18257A299
Person / Time
Site: NuScale
Issue date: 09/14/2018
From: Rad Z
NuScale
To:
Document Control Desk, Office of New Reactors
References
RAIO-0818-61581
Download: ML18257A299 (13)
v • d • e


Text

RAIO-0818-61581 NuScale Power, LLC 1100 NE Circle Blvd., Suite 200 Corvalis, Oregon 97330, Office: 541.360.0500, Fax: 541.207.3928 www.nuscalepower.com Docket No.52-048 6HSWHPEHU  8 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. 300 (eRAI No. 9186) on the NuScale Design Certification Application

REFERENCES:

1. U.S. Nuclear Regulatory Commission, "Request for Additional Information No. 300 (eRAI No. 9186)," dated December 15, 2017 2.

NuScale Power, LLC Response to NRC "Request for Additional Information No. 300 (eRAI No.9186)," dated February 13, 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. 9186:

02.03.01-6 This supplemental replaces the response to sub-part c) of Reference 2.

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 Prosanta Chowdhury NRC, OWFN-8G9A : NuScale Supplemental Response to NRC Request for Additional Information eRAI No. 9186 Zackary W. Rad Director, Regulatory Affairs

RAIO-0818-61581 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. 9186

Response to Request for Additional Information Docket No.52-048 eRAI No.: 9186 Date of RAI Issue: 12/15/2017 NRC Question No.: 02.03.01-6 Regulatory Background 10 CFR Part 50, Appendix A, General Design Criterion (GDC) 2, Design bases for protection against natural phenomena, states, in part, that [s]tructures, systems, and components important to safety shall be designed to withstand the effects of natural phenomena.without loss of capability to perform their safety functions and that [t]he design bases for these structures, systems, and components shall reflect.[a]ppropriate consideration of the most severe of the natural phenomena that have been historically reported for the site and surrounding area, with sufficient margin for the limited accuracy, quantity, and period of time in which the historical data have been accumulated.

In addition, 10 CFR 52.47(a)(1) requires a design certification applicant to provide site parameters postulated for its design and an analysis and evaluation of the design in terms of those site parameters.

Further, NUREG-0800, "Standard Review Plan for the Review of Safety Analysis Reports for Nuclear Power Plants: LWR Edition" (SRP), Section 2.3.1, Regional Climatology, establishes criteria that the NRC staff uses to evaluate whether an applicant meets the NRCs regulations.

With respect to its review of the applicants postulated design-basis dry-and/or wet-bulb temperature site parameter values, the NRC staff considered, in part, Item 6(e) under Subsection I (Areas of Review) and SRP Acceptance Criterion (7) under Subsection II (Acceptance Criteria) regarding ambient temperature and atmospheric moisture statistics for use in establishing heat loads for the design of normal plant heat sink systems, post-accident containment heat removal systems, and plant heating, ventilating, and air conditioning systems.

Key Issue This question is seeking clarification on the definitions of the summer and winter outdoor dry-and/or wet-bulb temperatures listed as site parameters in FSAR Tier 1, Table 5.0-1 and Tier 2, Table 2.0-1, including providing cross-references to those FSAR sections in which these postulated site parameters are used.

NuScale Nonproprietary

Information Requested The NRC staff notes that the postulated design-basis summer and winter outdoor dry-and/or wet-bulb temperatures specified in FSAR Tier 1, Table 5.0-1, and Tier 2, Table 2.0-1 are the same numerical values listed in Table 1.2-6, Envelope of ALWR Plant Site Design Parameters of the Advanced Light Water Reactor Utility Requirements Document, Volume II - ALWR Evolutionary Plant, Chapter 1 (Overall Requirements), Revision 8, published by EPRI, March 1999. This indicates that there has been no change to the values of these site design parameters up through Revision 13 of the EPRI URD, which FSAR Tier 2, Section 2.3.1 cites as the basis for these postulated site parameter values. However, unlike FSAR Tier 1, Table 5.0-1 and Tier 2, Table 2.0-1, Revision 8 of the EPRI URD designates these dry-and wet-bulb values as 0% Exceedance Values (historical limit excluding peaks < 2 hours2.314815e-5 days <br />5.555556e-4 hours <br />3.306878e-6 weeks <br />7.61e-7 months <br />).

In order for future potential COL applicants referencing the NuScale SMR plant design certification to be able to consistently develop and compare their climate-related site characteristics with the corresponding site parameter values, the applicant should address the following issues related to the design-basis dry-and/or wet-bulb temperature site parameter values in FSAR Tier 1, Table 5.0-1 and Tier 2, Table 2.0-1 and in FSAR Tier 2, Section 2.3.1:

a. Confirm, for each of these site parameters, whether the postulated design-basis summer and winter outdoor dry-and/or wet-bulb temperatures represent 0 percent exceedance values relative to those specific seasons and, if so (considering the potential range of locations that the NuScale SMR plant design might be deployed in), what months define those seasons. If not, then please identify and explain what exceedance probability these site parameter values represent.
b. For each site parameter that represents a 0 percent exceedance value, confirm whether they also represent an absolute maximum or minimum value or, as in the EPRI URD, are based on historical limits excluding peaks less than 2 hours2.314815e-5 days <br />5.555556e-4 hours <br />3.306878e-6 weeks <br />7.61e-7 months <br /> (or some other duration).
c. Define what the coincident wet-bulb temperature value represents (e.g., the overall maximum wet-bulb temperature that is coincident with the indicated dry-bulb temperature, the mean of the wet-bulb temperatures coincident with the indicated dry-bulb temperature, an estimated wet-bulb temperature value assumed to be coincident with the indicated dry-bulb temperature).
d. Consistent with SRP Section 2.3.1, Subsection I (Areas of Review), Item (6), last paragraph, which calls for [a]ll references to FSAR (Final Safety Analysis Report) sections in which these conditions are used to be identified by an applicant, please provide cross-references to those FSAR sections in which these postulated site parameters are used.

NuScale Nonproprietary

e. Annotate FSAR Tier 1, Table 5.0-1 and Tier 2, Table 2.0-1 to clarify these postulated site parameter values as indicated above, and/or revise FSAR Tier 2, Section 2.3.1 and related discussions under Tier 2, Section 9.4 to further explain what these values represent.

NuScale Response:

a) See previous response to RAI 9186.

b) See previous response to RAI 9186.

c) The coincident wet-bulb temperature value represents the overall maximum wet bulb temperature that is coincident with the indicated dry-bulb temperature. Tier 2 Section 2.3.1 is revised, as shown in the attached markup, to provide clarification. Tier 2 Sections 2.0 and 9.4 have also been revised, as shown in the attached markup, to incorporate editorial changes.

d) See previous response to RAI 9186.

e) See previous response to RAI 9186.

Impact on DCA:

FSAR Tier 2 Sections 2.0, 2.3, and 9.4 have been revised as described in the response above and as shown in the markup provided in this response.

NuScale Nonproprietary

NuScale Final Safety Analysis Report Site Characteristics and Site Parameters Tier 2 2.0-2 Draft Revision 2 RAI 02.03.01-2, RAI 02.03.01-6, RAI 02.03.01-6S1, RAI 02.03.01-8, RAI 02.03.05-1S1, RAI 03.07.02-24S1, RAI 03.08.05-1, RAI 03.08.05-8 Table 2.0-1: Site Design Parameters Site Characteristic / Parameter NuScale Design Parameter References to Parameter Geography and Demography (Section 2.1)

Minimum exclusion area boundary 400 feet from the closest release point Sections 2.1 and 2.3.4 Minimum outer boundary of low population zone 400 feet from the closest release point Sections 2.1 and 2.3.4 Nearby Industrial, Transportation, and Military Facilities (Section 2.2)

External hazards on plant systems, structures, and components (SSC) (e.g., explosions, fires, release of toxic chemicals and flammable clouds, pressure effects) on plant SSC No external hazards Section 2.2 Aircraft hazards on plant SSC No design basis aircraft hazards Sections 2.2 and 3.5.1.6 Meteorology (Section 2.3)

Maximum precipitation rate 19.4 inches per hour 6.3 inches for a 5 minute period Sections 3.4.2.2 and 3.8.4.3.10 Normal roof snow load 50 psf Sections 3.4.2.2, 3.8.4.3.10, 3.8.4.3.11, and 3.8.4.83.8.4.3.16, 3.8.4.4.1, 3.8.4.4.2, 3.8.4.8, and 3.8.5.5.5 Extreme roof snow load 75 psf Sections 3.4.2.2, 3.8.4.3.10, 3.8.4.3.12, and 3.8.4.83.8.4.3.16, 3.8.4.4.1, 3.8.4.4.2, 3.8.4.8, and 3.8.5.5.5 100-year return period 3-second wind gust speed 145 mph (eExposure Category C) with an importance factor of 1.15 for Reactor Building, Control Building, and Radioactive Waste Building Sections 3.3.1.1, 3.8.4.3.13, and 3.8.4.8 Design basis tornado maximum wind speed translational speed maximum rotational speed radius of maximum rotational speed pressure drop rate of pressure drop 230 mph 46 mph 184 mph 150 ft 1.2 psi 0.5 psi/sec Sections 3.1.1.2, 3.3.2.1, 3.3.2.2, 3.3.2.3, 3.8.4.3.14, and 3.8.4.8 Tornado missile spectra Table 2 of Regulatory Guide 1.76, Revision 1, Region 1 Sections 3.3.2.3, 3.5.1.4, 3.5.2, 3.5.3.1, and 3.5.3.2 Maximum wind speed design basis hurricane 290 mph Sections 3.1.1.2, 3.3.2.1, 3.3.2.2, 3.3.2.3, 3.8.4.3.14, and 3.8.4.8 Hurricane missile spectra Tables 1 and 2 of Regulatory Guide 1.221, Revision 0 Section 3.5.1.4, 3.3.2.3, 3.5.2, 3.5.3.1, and 3.5.3.2

NuScale Final Safety Analysis Report Site Characteristics and Site Parameters Tier 2 2.0-3 Draft Revision 2 Accident release /Q values at security owner controlled area fenceexclusion area boundary and outer boundary of low population zone 0-2 hr 6.22E-04 s/m3 Sections 15.0.3.2 and 15.0.3.3.11; Table 15.0-13 2-8 hr 5.27E-04 s/m3 8-24 hr 2.41E-04 s/m3 24-96 hr 2.51E-04 s/m3 96-720 hr 2.46E-04 s/m3 Accident release /Q values at main control room/technical support center door and HVAC intake (approximately 112 feet from source)

Door HVAC Intake 0-2 hr 6.50E-03 s/m3 6.50E-03 s/m3 Section 15.0.3.3.11; Table 15.0-13 2-8 hr 5.34E-03 s/m3 5.34E-03 s/m3 8-24 hr 2.32E-03 s/m3 2.32E-03 s/m3 1-4 day 2.37E-03 s/m3 2.37E-03 s/m3 4-30 day 2.14E-03 s/m3 2.14E-03 s/m3 Routine release /Q and D/Q values associated with the bounding offsite dose locationat restricted area boundary undepleted/no decay 5.431.44E-05 s/m3 Tables 11.3-5 and 11.3-6 undepleted/2.26-day decay 5.431.44E-05 s/m3 depleted/8.00-day decay 5.431.44E-05 s/m3 D/Q 5.431.44E-07 1/m2 Zero percent exceedance values (historical limit excluding peaks <2 hours)

Maximum outdoor design dry bulb temperature Minimum outdoor design dry bulb temperature Maximum coincident wet bulb temperature Maximum non-coincident wet bulb temperature Minimum outdoor design dry bulb temperature 115°F

-40°F 80°F 81°F

-40°F Sections 3.8.4.3.8, 3.8.4.8, 9.4.1.1, 20.1.1.4, and 20.1.1.5; Table 9.4.1-1 Table 2.0-1: Site Design Parameters (Continued)

Site Characteristic / Parameter NuScale Design Parameter References to Parameter

NuScale Final Safety Analysis Report Site Characteristics and Site Parameters Tier 2 2.0-4 Draft Revision 2 One percent annual exceedance values Maximum outdoor design dry bulb temperature Minimum outdoor design dry bulb temperature Maximum coincident wet bulb temperature Maximum non-coincident wet bulb temperature Minimum outdoor design dry bulb temperature 100°F

-10°F 77°F 80°F

-10°F Section 9.2.7.2.1; Tables 9.2.7-1, 9.4.2-1, 9.4.3-1, and 10.4-9 Five percent annual exceedance values Maximum outdoor design dry bulb temperature Minimum outdoor design dry bulb temperature Maximum coincident wet bulb temperature Minimum outdoor design dry bulb temperature 95°F

-5°F 77°F

-5°F Table 9.4.4-1 Hydrologic Engineering (Section 2.4)

Maximum flood elevation pProbable maximum flood and coincident wind wave and other effects on max flood level 1 foot below the baseline plant elevation Sections 2.4.2 and 3.4.2.1; Table 3.8.5-9 Maximum elevation of groundwater 2 feet below the baseline plant elevation Sections 2.4.12, 3.4.2.1, 3.8.4.3.22.1, and 3.8.4.8; Table 3.8.5-9 Geology, Seismology, and Geotechnical Engineering (Section 2.5)

Ground motion response spectra /safe shutdown earthquake See Figures 3.7.1-1 and 3.7.1-2 for horizontal and vertical certified seismic design response spectra (CSDRS) for all Seismic Category I SSC.

See Figures 3.7.1-3 and 3.7.1-4 for horizontal and vertical high frequency certified seismic design response spectra (CSDRS-HF) for Reactor Building and Control Building.

Sections 3.7.1.1, 3.8.4.3.16, and 3.8.4.8 Fault displacement potential No fault displacement potential Section 2.5.3 Minimum soil bearing capacity (Qult) beneath safety-related structures 75 ksf Sections 2.5.4, 3.8.5.6.3, and 3.8.5.6.7 Lateral soil variability Uniform site (< 20 degree dip)

Section 2.5.4 Minimum soil angle of internal friction 30 degrees Sections 2.5.4 and 3.8.5.3.1; Table 3.8.5-1 Minimum shear wave velocity 1000 fps at bottom of foundation Section 2.5.4 Liquefaction potential No liquefaction potential Section 2.5.4 Table 2.0-1: Site Design Parameters (Continued)

Site Characteristic / Parameter NuScale Design Parameter References to Parameter

NuScale Final Safety Analysis Report Meteorology Tier 2 2.3-1 Draft Revision 2 2.3 Meteorology RAI 02.03.01-7 The NuScale Power Plant is designed using meteorological parameters that are representative of a reasonable number of potential plant site locations in the United States. These parameters are discussed below and presented in Table 2.0-1.

COL Item 2.3-1:

A COL applicant that references the NuScale Power Plant design certification will describe the site-specific meteorological characteristics for Section 2.3.1 through Section 2.3.5, as applicable.

2.3.1 Regional Climatology The design maximum precipitation rate is 19.4 inches per hour and 6.3 inches for a 5 minute period. These values come from NWS HMR #52 (Reference 2.3-1) and address the majority of locations in the contiguous United States.

The design normal roof snow load is 50 psf. For the extreme roof snow load, a value of 150 percent of the normal roof snow load, or 75 psf was selected.

The design basis severe wind is a 3-second gust at 33 ft above ground for exposure category C. The wind speed (W) is 145 mph. The wind speed is increased by an importance factor of 1.15 for the design of the site independent structures. These design parameters are based upon ASCE/SEI 7-05 (Reference 2.3-4).

The parameters provided in Table 2.0-1 for the design basis tornado and tornado missiles are the most severe tornado parameters postulated for the continentalcontiguous United States as identified in RG 1.76, Rev. 1. Similarly, the parameters for the design basis hurricane and hurricane missiles are the most severe parameters postulated in RG 1.221, Rev 0.

RAI 02.03.01-6, RAI 02.03.01-6S1, RAI 02.03.01-8 The design basis dry-bulb and wet bulb temperatures are based on the EPRI Utility Requirements Document (Reference 2.3-2). Pertinent zero-, one-, and five-percentzero percent, and one and five percent annual exceedance values assumed in the design are provided in Table 2.0-1. The coincident wet-bulb temperature value represents the mean of the collectedoverall maximum wet bulb temperatures that occurredis coincident with the indicated dry-bulb temperature.

Regional climatology is site-specific and is addressed by the COL applicant as part of the response to COL Item 2.3-1.

2.3.2 Local Meteorology Local meteorology is site-specific and is addressed by the COL applicant as part of the response to COL Item 2.3-1.

NuScale Final Safety Analysis Report Air Conditioning, Heating, Cooling, and Ventilation Systems Tier 2 9.4-18 Draft Revision 2 RAI 02.03.01-6 Table 9.4.1-1: CRVS Outdoor Air Design Conditions Parameter Temperature*

Maximum outdoor design dry bulb temperature 115°F Maximum coincident design wet bulb temperature 80°F Maximum non-coincident wet bulb temperature 81°F Minimum outdoor design dry bulb temperature

-40°F

  • Table 9.4.1-1 temperatures are zero percent exceedance values (historical limits excluding peaks <2 hours)

NuScale Final Safety Analysis Report Air Conditioning, Heating, Cooling, and Ventilation Systems Tier 2 9.4-41 Draft Revision 2 RAI 02.03.01-8 Table 9.4.2-1: Outside Air Temperature Range for Reactor Building Ventilation System Parameter Temperature*

Maximum outdoor design dry bulb temperature 100°F Maximum coincident design wet bulb temperature 77°F Minimum outdoor design dry bulb temperature

-10°F

  • Table 9.4.2-1 temperatures are one percent annual exceedance values

NuScale Final Safety Analysis Report Air Conditioning, Heating, Cooling, and Ventilation Systems Tier 2 9.4-58 Draft Revision 2 RAI 02.03.01-8 Table 9.4.3-1: Outside Air Design Temperature for the Radioactive Waste Building HVAC System Parameter Temperature*

Maximum outdoor design dry bulb temperature 100°F Maximum coincident design wet bulb temperature 77°F Minimum outdoor design dry bulb temperature

-10°F

  • Table 9.4.3-1 temperatures are one percent annual exceedance values

NuScale Final Safety Analysis Report Air Conditioning, Heating, Cooling, and Ventilation Systems Tier 2 9.4-68 Draft Revision 2 RAI 02.03.01-8 Table 9.4.4-1: Turbine Building HVAC System Outdoor Air Design Conditions Parameter Temperature*

Maximum Outdoor Design Dry Bulb Temperature 95°F Maximum coincident Design Wet Bulb Temperature 77°F Minimum Design Dry Bulb Temperature

-5°F

  • Table 9.4.4-1 temperatures are five percent annual exceedance values
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