The Molten Salt Reactor (MSR) is considered one of the most suitable technology for micro mobile reactors due to its low operating pressure (3 ~ 5 atmospheres), which reduces weight and volume compared to pressurized water reactors (PWRs). Unlike PWRs, MSRs use molten salt as both fuel and coolant, enabling compact and transportable designs. This study outlines the conceptual design of a micro mobile MSR and establishes safety criteria for transient states. It proposes strategies for managing the primary loop, intermediate heat transfer system, and air-cooled Balance of Plant (BOP) while addressing thermal and structural constraints, such as maximum temperatures and molten salt freezing points. Control approaches for reactor output and BOP systems are analyzed, highlighting fast response and adaptability to frequent power changes. The study also compares fixed-speed and variable-speed pump operations and provides a framework for operational modes, from high-temperature standby to transport-ready conditions. These findings offer a foundation for efficient, safe, and flexible MSR deployment.

Abstract
1. 서 론
2. 초소형 이동식 용융염 원자로 제원 및제한 사항
    2.1 초소형 이동식 용융염 원자로 구성 및 제원
    2.2 제한조건
3. 원자로출력 제어와 BOP 요구출력제어
    3.1 온도제어프로그램
    3.2 중간열전달계통 출력 제어
    3.3 BOP 요구출력 제어
4. 운전모 드 및 운전전략
    4.1 운전모 드
    4.2 운전전략
5. 계측전략
    5.1 압력측정
    5.2 온도측정
    5.3 유량측정 및 출력산출
6. 결 론
후 기
References

• 유용환(Korea Atomic Energy Research Institute) | Yong Hwan Yoo Corresponding author
• 김상지(Korea Atomic Energy Research Institute) | Kim Sang Ji
• 여동열(Korea Atomic Energy Research Institute) | Dongyeol Yeo
• 김태우(Korea Atomic Energy Research Institute) | Taewoo Kim
• 이민규(Korea Atomic Energy Research Institute) | Minkyu Lee