ML25013A242

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LLC - Response to SDAA Audit Question Number A-5.4.1.3-3
ML25013A242
Person / Time
Site: 05200050
Issue date: 01/13/2025
From:
NuScale
To:
Office of Nuclear Reactor Regulation
Shared Package
ML25013A204 List:
References
LO-177590, LO-178078
Download: ML25013A242 (1)
v • d • e


Text

Response to SDAA Audit Question Question Number: A-5.4.1.3-3 Receipt Date: 12/05/2024 Question:

The following items are needed for docketing related to the approach temperature in FSAR Section 5.4.1.3, Performance Evaluation.

Item 1: Need information on the docket to show that approach temperature limit is reached prior to predicted DWO onset for all cases.

Item 2: Need information on the docket to clarify the NPM HCSG operating range and DWO analysis range. Staffs understand is in the table below.

(( 2(a),(c) NuScale Nonproprietary NuScale Nonproprietary

Item 3: Need information on the docket to describe how DWO onset calculations use suitably conservative input. Item 4: Need information on the docket to summarize the DWO PIRT and describe how important phenomena are captured. The importance of (( 

}}

2(a),(c) Item 5: Need information on the docket to describe and justify the time-step scheme which maintains the Courant number (( 

}}

2(a),(c) Item 6: Need information on the docket to describe the NPM HCSG nodalization. Item 7: Need assessment data or a description of it on the docket. Item 8: Need a description of the (( 

}}

2(a),(c) with a clear statement indicating that the test was (( 

}}

2(a),(c) Item 9: Need information on the docket to summarize (( 

}}

2(a),(c) Item 10: Need information on the docket to provide evidence that (( 

}}

2(a),(c) Item 11: Need information on the docket to address (( 

}}

2(a),(c) Item 12: Need information on the docket to describe (( 

}}

2(a),(c) Item 13: Need information on the docket to summarize (( 

}}

2(a),(c) NuScale Nonproprietary NuScale Nonproprietary

Item 14: Need information on the docket to justify that (( }} 2(a),(c) Item 15: Need information on the docket to address (( }} 2(a),(c) Item 16: Need information on the docket to address (( }} 2(a),(c) Item 17: Need information on the docket to address (( }} 2(a),(c) Item 18: Need information on the docket to address (( }} 2(a),(c) Item 19: Need information on the docket to address (( }} 2(a),(c)

Response

The following items are needed for docketing related to the approach temperature in Final Safety Analysis Report (FSAR) Section 5.4.1.3, Performance Evaluation. Item 1 Response Figure 1, Figure 2, and Figure 3 show there is (( }}2(a),(c),ECI is the boundary between Region 1 and Region 2 in FSAR Figure 5.4-16, Approach Temperature for NPM-20. Engineering calculation EC-174500, Revision 1, will be provided in the electronic reading room (eRR). NuScale Nonproprietary NuScale Nonproprietary

(( 

}}2(a),(c),ECI

(( 

}}2(a),(c),ECI NuScale Nonproprietary NuScale Nonproprietary

(( }}2(a),(c),ECI (( }}2(a),(c),ECI NuScale Nonproprietary NuScale Nonproprietary

(( }}2(a),(c),ECI (( }}2(a),(c),ECI NuScale Nonproprietary NuScale Nonproprietary

(( }}2(a),(c),ECI (( }}2(a),(c),ECI NuScale Nonproprietary NuScale Nonproprietary

Item 2 Response NuScale provides the following information in Table 1 to confirm the NRCs understanding of the ranges of power, secondary side pressure, feedwater (FW) subcooling, FW flow rate (per SG), and RCS Tavg. Range units used are

percent rated thermal power (percent RTP)

pounds per square inch absolute (psia)

gallons per minute (gpm)

degrees Fahrenheit (degrees F) (( }}2(a),(c),ECI (( }}2(a),(c),ECI NuScale Nonproprietary NuScale Nonproprietary

The values in Table 1 come from or are derived from EC-174500, Revision 1, DWO Approach Temperature Limit, which is in the eRR. NuScale Nonproprietary NuScale Nonproprietary

Item 3 Response Section 3.4.1 of EC-174500, Revision 1, (( 

}}2(a),(c),ECI

(( 

}}2(a),(c),ECI NuScale Nonproprietary NuScale Nonproprietary

Item 4 Response Table 2 describes the important phenomena identified in the DWO phenomena identification and ranking table (PIRT) from ER-109852, Revision 0, NRELAP5 DWO Applicability. (( }}2(a),(c),ECI NuScale Nonproprietary NuScale Nonproprietary

(( }}2(a),(c),ECI (( }}2(a),(c),ECI NuScale Nonproprietary NuScale Nonproprietary

(( }}2(a),(c),ECI NuScale Nonproprietary NuScale Nonproprietary

Item 5 Response (( }}2(a),(c),ECI (( }}2(a),(c),ECI (( }}2(a),(c),ECI (( }}2(a),(c),ECI NuScale Nonproprietary NuScale Nonproprietary

(( }}2(a),(c),ECI (( }}2(a),(c),ECI (( 

}}2(a),(c),ECI Engineering report ER118731, Revision 0, is in the eRR.

NuScale Nonproprietary NuScale Nonproprietary

Item 6 Response (( 

}}2(a),(c),ECI

(( 

}}2(a),(c),ECI

(( }}2(a),(c),ECI (( 

}}2(a),(c),ECI NuScale Nonproprietary NuScale Nonproprietary

(( }}2(a),(c),ECI

(( }}2(a),(c),ECI o (( }}2(a),(c),ECI o (( }}2(a),(c),ECI

(( }}2(a),(c),ECI

(( }}2(a),(c),ECI

(( }}2(a),(c),ECI

(( }}2(a),(c),ECI o (( }}2(a),(c),ECI o (( }}2(a),(c),ECI

(( }}2(a),(c),ECI o (( }}2(a),(c),ECI o (( }}2(a),(c),ECI o (( }}2(a),(c),ECI o (( }}2(a),(c),ECI NuScale Nonproprietary NuScale Nonproprietary

o (( }}2(a),(c),ECI

(( }}2(a),(c),ECI o (( }}2(a),(c),ECI (( }}2(a),(c),ECI

(( }}2(a),(c),ECI o (( }}2(a),(c),ECI o (( }}2(a),(c),ECI o (( }}2(a),(c),ECI NuScale Nonproprietary NuScale Nonproprietary

o (( }}2(a),(c),ECI o (( }}2(a),(c),ECI o (( }}2(a),(c),ECI o (( }}2(a),(c),ECI o (( }}2(a),(c),ECI o (( }}2(a),(c),ECI NuScale Nonproprietary NuScale Nonproprietary

o (( }}2(a),(c),ECI o (( }}2(a),(c),ECI

(( }}2(a),(c),ECI o (( }}2(a),(c) o (( }}2(a),(c) o (( }}2(a),(c),ECI o (( }}2(a),(c),ECI o (( }}2(a),(c),ECI o (( }}2(a),(c),ECI NuScale Nonproprietary NuScale Nonproprietary

(( }}2(a),(c) (( }}2(a),(c) (( }}2(a),(c) (( }}2(a),(c),ECI (( }}2(a),(c),ECI (( }}2(a),(c) Engineering calculation ER-118731, Revision 0, EC-152384, Revision 1, and EC-132245, Revision 1, are in the eRR. Engineering calculation EC-174500, Revision 1, will be in the eRR. NuScale Nonproprietary NuScale Nonproprietary

Item 7 Response Table 3 shows the (( }}2(a),(c),ECI (( }}2(a),(c),ECI (( (( }}2(a),(c),ECI }}2(a),(c),ECI NuScale Nonproprietary NuScale Nonproprietary

(( }}2(a),(c),ECI (( }}2(a),(c),ECI Table 4 shows the (( }}2(a),(c),ECI (( }}2(a),(c),ECI (( (( }}2(a),(c),ECI }}2(a),(c),ECI NuScale Nonproprietary NuScale Nonproprietary

(( }}2(a),(c),ECI (( }}2(a),(c),ECI NuScale Nonproprietary NuScale Nonproprietary

(( }}2(a),(c),ECI (( }}2(a),(c),ECI NuScale Nonproprietary NuScale Nonproprietary

Item 8 Response (( }}2(a),(c),ECI (( }}2(a),(c),ECI (( }}2(a),(c),ECI (( (( }}2(a),(c),ECI }}2(a),(c),ECI NuScale Nonproprietary NuScale Nonproprietary

(( }}2(a),(c),ECI (( }}2(a),(c),ECI (( }}2(a),(c),ECI NuScale Nonproprietary NuScale Nonproprietary

(( }}2(a),(c),ECI (( }}i2(a),(c),ECI (( }}2(a),(c),ECI (( }}2(a),(c),ECI (( }}2(a),(c),ECI (( }}2(a),(c),ECI (( }}2(a),(c),ECI (( }}2(a),(c),ECI NuScale Nonproprietary NuScale Nonproprietary

(( }}2(a),(c),ECI (( }}2(a),(c),ECI (( }}2(a),(c),ECI NuScale Nonproprietary NuScale Nonproprietary

(( }}2(a),(c),ECI (( }}2(a),(c),ECI (( }}2(a),(c),ECI (( }}2(a),(c),ECI (( }}2(a),(c),ECI NuScale Nonproprietary NuScale Nonproprietary

(( }}2(a),(c),ECI (( }}2(a),(c),ECI (( }}2(a),(c),ECI (( }}2(a),(c),ECI (( }}2(a),(c),ECI (( }}2(a),(c),ECI NuScale Nonproprietary NuScale Nonproprietary

(( }}2(a),(c),ECI NuScale Nonproprietary NuScale Nonproprietary

(( }}2(a),(c),ECI (( }}2(a),(c),ECI (( }}2(a),(c),ECI (( }}2(a),(c),ECI (( }}2(a),(c),ECI (( }}2(a),(c),ECI

(( }}2(a),(c),ECI NuScale Nonproprietary NuScale Nonproprietary

(( }}2(a),(c),ECI (( }}2(a),(c),ECI (( }}2(a),(c),ECI (( }}2(a),(c),ECI (( }}2(a),(c),ECI

(( }}2(a),(c),ECI

(( }}2(a),(c),ECI (( }}2(a),(c),ECI The primary conclusions are

(( 

}}2(a),(c),ECI NuScale Nonproprietary NuScale Nonproprietary

(( }}2(a),(c),ECI

(( }}2(a),(c),ECI (( }}2(a),(c),ECI NuScale Nonproprietary NuScale Nonproprietary

Item 9 Response (( 

}}2(a),(c),ECI

(( 

}}2(a),(c),ECI

(( 

}}2(a),(c),ECI

(( 

}}2(a),(c),ECI

(( 

}}2(a),(c),ECI NuScale Nonproprietary NuScale Nonproprietary

(( 

}}2(a),(c),ECI

(( 

}}2(a),(c),ECI

(( 

}}2(a),(c),ECI

(( 

}}2(a),(c),ECI

(( 

}}2(a),(c),ECI NuScale Nonproprietary NuScale Nonproprietary

(( }}2(a),(c),ECI (( }}2(a),(c),ECI NuScale Nonproprietary NuScale Nonproprietary

(( }}2(a),(c),ECI (( }}2(a),(c),ECI (( }}2(a),(c),ECI (( }}2(a),(c),ECI NuScale Nonproprietary NuScale Nonproprietary

(( }}2(a),(c),ECI (( }}2(a),(c),ECI (( }}2(a),(c),ECI (( }}2(a),(c),ECI NuScale Nonproprietary NuScale Nonproprietary

Item 10 Response (( }}2(a),(c),ECI (( }}2(a),(c),ECI (( (( }}2(a),(c),ECI }}2(a),(c),ECI NuScale Nonproprietary NuScale Nonproprietary

(( }}2(a),(c),ECI (( }}2(a),(c),ECI NuScale Nonproprietary NuScale Nonproprietary

(( }}2(a),(c),ECI (( }}2(a),(c),ECI NuScale Nonproprietary NuScale Nonproprietary

(( }}2(a),(c),ECI (( }}2(a),(c),ECI NuScale Nonproprietary NuScale Nonproprietary

(( }}2(a),(c),ECI (( }}2(a),(c),ECI NuScale Nonproprietary NuScale Nonproprietary

Item 11 Response (( }}2(a),(c),ECI Engineering calculation EC-170122, Revision 0, is in the eRR. (( }}2(a),(c),ECI (( }}2(a),(c),ECI NuScale Nonproprietary NuScale Nonproprietary

Item 12 Response (( }}2(a),(c),ECI (( }}2(a),(c),ECI (( }}2(a),(c),ECI (( }}2(a),(c),ECI (( }}2(a),(c),ECI (( }}2(a),(c),ECI NuScale Nonproprietary NuScale Nonproprietary

(( }}2(a),(c),ECI (( }}2(a),(c),ECI (( }}2(a),(c),ECI (( }}2(a),(c),ECI NuScale Nonproprietary NuScale Nonproprietary

(( }}2(a),(c),ECI (( }}2(a),(c),ECI

(( }}2(a),(c),ECI

(( }}2(a),(c),ECI

(( }}2(a),(c),ECI (( }}2(a),(c),ECI NuScale Nonproprietary NuScale Nonproprietary

Item 13 Response (( }}2(a),(c),ECI (( }}2(a),(c),ECI (( }}2(a),(c),ECI (( }}2(a),(c),ECI (( }}2(a),(c),ECI NuScale Nonproprietary NuScale Nonproprietary

(( }}2(a),(c),ECI (( }}2(a),(c),ECI NuScale Nonproprietary NuScale Nonproprietary

Item 14 Response (( 

}}2(a),(c),ECI Calculation EC-164896, Revision 0, Ledinegg Instability Screening, describes the method demonstrating that the SG is free of Ledinegg instability for both individual tubes and the bulk SG, and is in the eRR.

(( 

}}2(a),(c),ECI

(( 

}}2(a),(c),ECI NuScale Nonproprietary NuScale Nonproprietary

(( }}2(a),(c),ECI (( }}2(a),(c),ECI NuScale Nonproprietary NuScale Nonproprietary

Item 15 Response Figure 18 is (( }}2(a),(c),ECI Figure 19 is (( }}2(a),(c),ECI (( }}2(a),(c),ECI (( }}2(a),(c),ECI NuScale Nonproprietary NuScale Nonproprietary

(( }}2(a),(c),ECI (( }}2(a),(c),ECI NuScale Nonproprietary NuScale Nonproprietary

Item 16 Response The following text is from (( 

}}2(a),(c),ECI of ER-101144, Revision 3, Pressure and Thermal Transient Definitions for Analysis of NSSS Components, which is in the Chapter 3 Audit eRR. Some additional detail is added for clarity and completeness.

Description (( 

}}2(a),(c),ECI

(( 

}}2(a),(c),ECI

(( 

}}2(a),(c),ECI Initial Conditions DWO could potentially occur when the DWO onset approach temperature limit in Figure 5.4-16 is violated. (( 
}}2(a),(c),ECI NuScale Nonproprietary NuScale Nonproprietary

Number of Cycles For design purposes, this transient is specified to occur for a total of 2840 days over the 60-year life of the plant. (( }}2(a),(c),ECI a conservative design DWO operational time of 2840 days to be used in ASME component analyses. The ASME component analyses may use an oscillation period to convert the DWO operational time to a cycle count as needed. NuScale Nonproprietary NuScale Nonproprietary

Item 17 Response (( }}2(a),(c),ECI (( }}2(a),(c),ECI NuScale Nonproprietary NuScale Nonproprietary

(( }}2(a),(c),ECI NuScale Nonproprietary NuScale Nonproprietary

Item 18 Response (( }}2(a),(c),ECI (( }}2(a),(c),ECI (( }}2(a),(c),ECI NuScale Nonproprietary NuScale Nonproprietary

Item 19 Response (( }}2(a),(c),ECI (( }}2(a),(c),ECI (( }}2(a),(c),ECI }}2(a),(c),ECI NuScale Nonproprietary NuScale Nonproprietary ((

(( }}2(a),(c),ECI (( }}2(a),(c),ECI NuScale Nonproprietary NuScale Nonproprietary

(( }}2(a),(c),ECI (( }}2(a),(c),ECI NuScale Nonproprietary NuScale Nonproprietary

(( }}2(a),(c),ECI (( }}2(a),(c),ECI NuScale Nonproprietary NuScale Nonproprietary

(( }}2(a),(c),ECI (( }}2(a),(c),ECI NuScale Nonproprietary NuScale Nonproprietary

(( }}2(a),(c),ECI (( }}2(a),(c),ECI No changes to the SDAA are necessary. NuScale Nonproprietary NuScale Nonproprietary}}

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