Thermohydraulic Problems of Heavy Liquid Metal Cooled Reactor Core
The paper considers thermalhydraulic problems in reactor core cooled with heavy liquid metal coolants (lead, lead-bismuth. It is analyzed specific features of thermal hydraulics in such type of reactors as compared with sodium cooled reactors caused by the following factors: physical properties of the coolants, reactor core geometry (an influence of inlet collector, universality of laws for velocity and temperature distributions in normal direction to the pin surface in combined channels, temperature non-uniformity over fuel pin perimeter, the conditional nature of heat transfer coefficient, temperature rise under the fins, contact thermal resistance etc). It is noted that the use of modeling liquid, such as NaK alloy with Prandtl number being close to one for heavy metals makes experiments on model subassemblies simpler. The developed general concept of determination of maximum fuel pin surface temperature, includes the following points: definition of coolant temperature distribution calculated with regard for an inter-channel exchange being conditioned by the availability of fuel pin spacing or spacer grids; temperature difference “wall-coolant under conditions of variable heat flux at the wall; a length of thermal stabilization for lateral fuel pins, which is more “tighten as compared to central pins and has not been considered practically for heavy coolant reactors; contact thermal resistance; hot spots factors, blockage, deformation of fuel pin bundle and others. The latest thermal-hydraulic researches performed on the model subassemblies with sodium and heavy metal coolants have shown a mutual connection between thermal hydraulics and fuel burn-out. Attention is paid to the necessity of wide verification, benchmarks that is a key question in an improvement of codes and methods for numerical modeling of thermal hydraulics for heavy liquid metal cooled reactor core.
Thermal hydraulics reactor core heavy metal coolants lead lead-bithmus.
A.P.Sorokin A.D.Efanov A.V.Zhukov G.P.Bogoslovskaya Yu.A.Kuzina
State Scientific Centre of the Russian Federation – Institute for Physics and Power Engineering named after A.I.Leypunsky 1, Bondarenko sq., Obninsk, Russia
国际会议
上海
英文
1041-1054
2010-10-10（万方平台首次上网日期，不代表论文的发表时间）