The supercritical carbon dioxide Brayton cycle(S-CO2) is one of promising alternatives as a power conversion system of the sodium-cooled fast reactor due to higher cycle efficiency and less reactive working fluid to sodium, compared to the steam Rankine cycle. In a S-CO2 Brayton cycle, turbine, compressors and generator are coupled with a same axis and their rotating speeds are variable in accordance with electrical outputs. However, to synchronize the cycle with a electrical grid, the electrical output of the cycle must has the same frequency with the electrical grid regardless of amount of the turbine output. To deal with this problem, several methods were proposed but each method still has their own weaknesses. In this paper, a new idea will be presented. The idea that the generator with the two reverse rotors are introduced into S-CO2 Brayton cycle and it aims to produce a full range of electricity at a fixed frequency with high efficiency.

Abstract
 1. 서 론
 2. 기존의 S-CO2 Brayton cycle
  2.1 S-CO2 Brayton cycle
  2.2 기존의 압축기, 터빈 및 발전기의 구성
 3. 두 개의 역방향 회전자 발전기
  3.1 두 개의 역방향 회전자 발전기를 갖는 S-CO2 Brayton cycle의 기본구성
  3.2 두 개의 역방향 회전자 발전기의 원리
  3.3 수치해석
  3.4 수치해석결과
 5. 결 론
 References

• 유용환(한국원자력연구원) | Yong Hwan Yoo
• 김준연(한국원자력연구원) | Jun Yeon Kim
• 우상익(한국원자력연구원) | Sangik Wu