TEM perature pressure EST imatior of a Homogeneous Boiling Fuel-Steel Mixture in an LMFBR Core

摘要

This paper describes a simple computer program for the TEMperature and Pressure ESTimation (TEMPEST) of a boiling fuel-steel pool in an LMFBR core. The time scale of interest of this program is large, of the order of ten seconds. Further, the vigorous boiling in the pool will generate a large contact, and hence a large heat cransfer between fuel and steel. The pool in this program is assumed to be a uniform mixture of fuel and steel, and consequently, vapor production is also assumed to be uniform throughout the pool. The pool is allowed to expand in volume if there is steel melting at the walls. In this program, the total mass of liquid and vapor fuel is always kept constant, but the total steel mass in the pool may change by steel wall melting. Because of a lack of clear understanding of the physical phenomena associated with the progression of a fuel-steel mixture at high temperature, various input options have been built-in in this program to enable one to perform parametric studies. As for example, the heat transfer from the pool to the surrounding steel structure may be controlled by input values for the heat transfer coefficients, or, the heat transfer may be calculated by a correlation obtained from the literature.