ML23304A489

LLC Response to NRCs Request for Docketing of Resolved Audit Responses, Chapter 15, Section 15.5.1-1, Information Related to Chemical and Volume Control System Malfunction

ML23304A489
Person / Time
Site:	05200050
Issue date:	10/31/2023
From:	NuScale
To:	Office of Nuclear Reactor Regulation
Shared Package
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References
LO-152560
Download: ML23304A489 (1)

Text

NuScale Nonproprietary Response to SDAA Audit Question Question Number: A-15.5.1-1 Receipt Date: 04/17/2023 Question:

Initial conditions are missing for the 3 limiting cases in Table 15.5-2: Drift on RSV setpoint, delay on CVCS isolation valve closure time, and maximum regulating control rod speed. Please provide markups to this table for inclusion in the SDAA.

Response

The drift of the reactor safety valve (RSV) setpoint, delay on chemical volume and control system (CVCS) isolation valve closure time, and maximum regulating control rod speed are added to FSAR Section 15.5 Table 15.5-2, Initial Conditions - Chemical and Volume Control System Malfunction.

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

NuScale Nonproprietary

Audit Item A-15.5.1-1 NuScale US460 SDAA NuScale Final Safety Analysis Report Table 15.5-2: Initial Conditions - Chemical and Volume Control System Malfunction Case PZR Level [%]1 RCS Makeup Makeup Flow Pressurizer Containment The Drift on Maximum Temperature Temperature [gpm] Spray Isolation Valve RSV Setpoint Regulating

[°F]1 [°F]1 Closure Time [psia]1 Control Rod

[s] Speed [in/min]

Limiting RCS 52 (-8) 535 (-5) 150 (+90) 40 Off 10 2266 (+3%) 6 pressure Limiting SG 52 (-8) 545 (+5) 40 (-20) 25 Off 10 2266 (+3%) 6 pressure Limiting 52 (-8) 545 (+5) 40 (-20) 40 On 10 2266 (+3%) 6 MCHFR 1 Biases are in parentheses.

15.5-7 Increase in Reactor Coolant Inventory Draft Revision 1