Study on key-tech problems in development of a cold neutron source in China advanced research reactor

摘要

This paper introduces main design schemes of the cold neutron source in CARR. Because of large reactor power, high nuclear heating and high heat flux in moderator cell, special solutions were proposed. Moderator cell is directly cooled by cryogenic helium. Higher saturation vapor pressure of moderator, hydrogen, is adopted. A composite condenser and a single-tube thermal-siphon loop for moderator are used. All these designs will provide the CNS with excellent operation performances.