3co。ants冷却剂 The principal requirements of the coolant for a nuclear reactor are follows Good thermodynamic properties, namely high thermal conductivity, density and specific heat t(比热) and low viscosity(.度) Chemically non-reactive with other components of the reactor Very low neutron capture cross-section It should not become radioactive as a result of(n, n) reactions which may occur when the coolant is passing through the core of the reactor. Candidates Water Helium Liquid metal, such as Sodium, Lithium, Mercury, Sodium-potassium Lead Molten salts熔融盐类 Carbon dioxide3 Coolants 冷却剂 • The principal requirements of the coolant for a nuclear reactor are follows: – Good thermodynamic properties, namely high thermal conductivity, density and specific heat(比热), and low viscosity(粘度). – Chemically non-reactive with other components of the reactor. – Very low neutron capture cross-section. – It should not become radioactive as a result of (n, g) reactions which may occur when the coolant is passing through the core of the reactor. • Candidates – Water – Helium – Liquid metal, such as Sodium, Lithium, Mercury, Sodium-potassium, Lead – Molten salts 熔融盐类 – Carbon dioxide