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Enclosure 1 - Presentation Slides for the May 16, 2024 ACRS Kairos Power Subcommittee Meeting
	ML24131A127
Person / Time
Site:	Hermes File:Kairos Power icon.png
Issue date:	05/10/2024
From:	Peebles D, Tomkins J; Kairos Power
To:	; Office of Nuclear Reactor Regulation
Shared Package
ML24131A125	List: ML24131A126; ML24131A127;
References
	KP-NRC-2405-004
	Download: ML24131A127 (1)
	v • d • e

No Reproduction or Distribution Without Express Written Permission of Kairos Power LLC.

HERMES 2 PSAR (CH. 1, 4, 6-8, 10-12, 14, 16-18)

DREW PEEBLES - SENIOR LICENSING MANAGER JIM TOMKINS - FUELS LICENSING MANAGER MAY 16, 2024 ACRS Kairos Power Subcommittee Meeting 1

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Kairos Powers mission is to enable the worlds transition to clean energy, with the ultimate goal of dramatically improving peoples quality of life while protecting the environment.

In order to achieve this mission, we must prioritize our efforts to focus on a clean energy technology that is affordable and safe.

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Introduction

Kairos Power submitted a construction permit application (CPA) for a two-unit test reactor named Hermes 2 in July 2023

Hermes 2 will be licensed as a test reactor under the provisions of 10 CFR 50.21(c) and Atomic Energy Act Section 2134(c) to test and demonstrate:

An intermediate (salt) heat transport loop between the primary and power generation systems An electrical power production (shared) and power generation system An increased component lifetime

The content of this application is similar to and relies extensively on content provided in the Hermes construction permit application.

Kairos Power requested that the NRC leverage the safety evaluation of the Hermes CPA to the maximum extent possible (similar to a design-centered review approach) due to similarities found with the design and siting information

To facilitate this delta review, the Hermes 2 PSAR content is annotated with blue text if the content was different than Hermes PSAR content 3

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Key Differences between Hermes and Hermes 2

Hermes 2 (Unit 1 and Unit 2) is identical to Hermes except for the following high-level changes:

Two reactor unit facility with separate reactor buildings for each unit Licensed lifetime is 11 years Electrical power generation capability Some sharing of SSCs No sharing of safety-related SSCs The two units will share a power generation system (some portions are not shared)

Some sharing of other non-safety related SSCs (e.g., site-related utility services)

Shared main control room Each unit will use an intermediate salt loop to exchange heat from the primary salt to the common power generation system Additional tritium management strategies due to addition of intermediate loop and power generation system The additional hazards from the design deltas are considered in safety analysis 4

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Hermes 2 PSAR Chapters Identical to Hermes PSAR

Hermes 2 PSAR chapters 6, 10, 12, and 16-18 have no substantive changes from the Hermes PSAR:

Chapter 6 The functional containment strategy and decay heat removal system (DHRS) design for each Hermes 2 unit are identical to Hermes.

Chapter 10 Like Hermes, the Hermes 2 facility will not include dedicated experimental facilities.

Chapter 12 The program descriptions for Hermes 2 are identical to those of Hermes (with the minor exception that some staffing may be shared for the site).

Chapters 16-18 Like Hermes, these sections are not applicable to the Hermes 2 CPA.

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PSAR Chapter 1: The Facility

Hermes 2 PSAR Ch. 1 is a summary chapter that points to content in the rest of the PSAR, therefore it contains differences from the Hermes PSAR Chapter 1 that reflect the Hermes 2 design and operating characteristic changes (e.g., Ch. 1 has a summary of site information, but the detailed site information is in Ch. 2).

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PSAR Chapter 4: Reactor Description

Design of reactor core, reactor vessel system, biological shield, nuclear, thermal hydraulic, and reactor vessel structural support for each Hermes 2 unit is identical to Hermes, except for a longer material lifetime.

Material qualification for an 11-year life of metallic and graphite materials follows the previously approved methodologies in:

KP-TR-013-P-A Metallic Materials Qualification for the Kairos Power Fluoride Salt-Cooled High Temperature Reactor KP-TR-014-P-A Graphite Material Qualification for the Kairos Power Fluoride Salt-Cooled High Temperature Reactor

The specific testing requirements in the referenced topical reports provide testing commitments ranging from a non-power reactor with a 5-year lifetime to a commercial power reactor with a 20-year lifetime.

PSAR Table 4.3-3 through 4.3-8 provide the specific qualification test requirements for an 11-year non-power reactor lifetime.

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PSAR Chapter 7: Instrumentation and Controls

The design of the safety-related portions of the I&C systems for Hermes 2 is identical to Hermes except for an additional trip on the intermediate salt pump to limit potential overcooling.

The safety-related portions of the I&C systems are not shared between units

Portions of the non-safety related I&C systems for Hermes 2 are shared between units. The design of these systems is similar to the non-safety related portions of the I&C systems for Hermes except for the following:

The plant control system for Hermes 2 has two subsystems in addition to the subsystems described in the Hermes PSAR:

Intermediate heat transport control system (not shared)

Power generation control system (shared)

The main control room for Hermes 2 is configured for two-unit operations. The main control room is shared.

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PSAR Chapter 8: Electrical Power Systems

The electrical power system for Hermes 2 is also non-safety related and only differs from Hermes to incorporate the two-unit facility and power generation capabilities Portions of the AC power are shared between Unit 1 and Unit 2 but does not perform a safety function The backup power generators are shared between Unit 1 and Unit 2 but do not perform a safety function AC power generated from the turbine generator system is provided to an onsite switchyard and distributed to the offsite electrical grid The switchyard includes protection from electrical faults and grid fluctuations 9

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PSAR Chapter 11: Radiation Protection and Waste Management

The preliminary description of the radiation protection and waste management programs for Hermes 2 is identical to the description in the Hermes PSAR except for the following:

The Hermes normal radiological effluent screening analysis was evaluated for Hermes 2 Bounding dose from Hermes analysis is conservatively doubled to account for both units of Hermes 2 Considers new potential gaseous effluent release points including the power generation system evaporator, flash vessel, deaerator, and condenser vent pipes Total site emissions include bounding contributions from the Hermes test reactor facility Results of Hermes 2 screening analysis demonstrate that doses from all site effluents are below Part 20 limits for individual members of the public 10

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PSAR Chapter 14: Technical Specifications

Consistent with the Hermes PSAR, the Hermes 2 PSAR only provides expected variables to be controlled by technical specifications. The technical specifications will be provided with the application for an operating license.

The anticipated limiting conditions for Hermes 2 operation (LCO) include the same parameters from the Hermes PSAR with the following modifications:

The LCO for materials at risk includes the intermediate heat transport system and power generation system.

Additional LCOs for operability of IHTS overpressure relief devices, limitations on the quantity of Flibe in the intermediate coolant, and limitations on the quantity of water in the intermediate coolant.

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ML24131A127

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