ML24033A181

Hermes 2 General Audit Questions 5.2-6, 5.2-7, 5.2-8, and 5.2-9

ML24033A181
Person / Time
Site:	05000611, 05000612
Issue date:	02/02/2024
From:	Michael Orenak NRC/NRR/DANU/UAL1
To:	Gardner D, Peebles D Kairos Power
References
EPID L-2023-CPS-0000
Download: ML24033A181 (1)

Text

From: Michael Orenak To: Darrell Gardner; Drew Peebles Cc: Pravin Sawant; Candace de Messieres; William Jessup; Matthew Hiser

Subject:

Hermes 2 Audit Questions 5.2-6, 5.2-7, 5.2-8, and 5.2-9 Date: Friday, February 2, 2024 10:10:00 AM

Darrell and Drew,

Below is the eighth set of audit questions for the Hermes 2 General Audit.The NRC staff would like to have a discussion regarding these questions when Kairos is ready. Kairos is welcome to post answers to these questions on the Kairos electronic reading room, but no written answers are requested by the NRC staff at this time.

PSAR Section RequestRequest/Question Number 5.2, Intermediate 5.2-6 Describe the preliminary design of the rupture Heat Transport disk(s). Given that rupture disk design and System operation may vary based on particular system conditions and events, discuss how the preliminary design accounts for the operating characteristics that are unique to the Hermes 2 intermediate heat transport system.

5.2, Intermediate 5.2-7 Specify whether Kairos intends to follow the Heat Transport overpressure protection provisions for rupture System disks in the American Society of Mechanical Engineers (ASME) Boiler and Pressure Vessel Code,Section III, Division 5, High Temperature Reactors.

5.2, Intermediate 5.2-8 Discuss how the rupture disk will be qualified to Heat Transport operate in its environment (i.e., hydrogen fluoride System (HF) exposure and potential salt vapor).

5.2, Intermediate 5.2-9 State whether a build-up of salt vapor or corrosion Heat Transport products (e.g., from HF) could prevent the rupture System disk from properly functioning or discuss how the rupture disk is being designed to prevent a loss of functionality under these conditions.

If you have any questions or need clarifications on the questions before the discussion, please do not hesitate to contact me. This email will be added to ADAMS and will be made public.

Mike

Michael D. Orenak, Project Manager Advanced Reactor Licensing Branch 1 (UAL1)

NRR - Division of Advanced Reactors and Non-Power Production and Utilization Facilities (DANU) 301-415-3229 Michael.Orenak@nrc.gov