ML23304A447

LLC Response to NRCs Request for Docketing of Resolved Audit Responses, Chapter 3, Section 4.3-8, Information Related to Nuclear Design

ML23304A447
Person / Time
Site:	05200050
Issue date:	10/31/2023
From:	NuScale
To:	Office of Nuclear Reactor Regulation
Shared Package
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Download: ML23304A447 (1)

Text

NuScale Nonproprietary Response to SDAA Audit Question Question Number:A-4.3-8 Receipt Date:05/30/2023 Question:

Revise Table 4.3-2: Nuclear Design Parameters (for Equilibrium Cycle) to correct the Doppler temperature coefficient. The value presented in Table 4.3-2 shows a positive value of the Doppler temperature coefficient. NRC staff believes this is a typo. Please provide a markup correction to the FSAR.

Response

Table 4.3-2 of the Standard Design Approval Application Final Safety Analysis Report is updated as shown in the attached markups.

Markups of the affected changes, as described in the response, are provided below:

NuScale Nonproprietary

NuScale Final Safety Analysis Report Nuclear Design NuScale US460 SDAA 4.3-24 Draft Revision 1 Audit Question A-4.3-8 1 Figure 4.3-15 provides the moderator temperature coefficient as a function of power.

2 No xenon is assumed for the design-basis refueling boron concentration calculation.

Table 4.3-2: Nuclear Design Parameters (for Equilibrium Cycle)

Core Average Linear Power (kw/ft) 3.9 Heat Flux Hot Channel Factor 2.196 Maximum Enthalpy Rise Hot Channel Factor 1.4 Reactivity Coefficients Doppler temperature coefficient ($/F, least negative)

-2.1E-03 Doppler temperature coefficient ($/F, most negative)

-4.6E-03 MTC (HZP-hot full power (HFP), least negative) ($/F)1 0.010 to -0.010 MTC (HZP-HFP, most negative) ($/F)1

-0.060 to -0.140 Boron coefficient (pcm/ppm)

-10 Effective Delayed Neutron Fraction and Prompt Neutron Lifetime eff BOC 0.0064 eff EOC 0.0048 Prompt lifetime BOC (10-5seconds) 3.0 Prompt lifetime EOC (10-5seconds) 1.0 Control Rods CRA requirement Table 4.3-3 Maximum ejected rod Section 15.4.8 Bank Worth Figure 4.3-22 through Figure 4.3-25 Boron Concentration Limits (ppm)

Mode 1 1900 Mode 1 (equilibrium xenon) 1400 Reduction with fuel burnup Figure 4.3-19 Mode 2 600 Mode 3 650 Design-basis refueling2 1900