Thermodynamics and distribution function of neutron gas system in a stationary power reactor with decoupling

The thermodynamics and the distribution function of a neutron gas system in a stationary power reactor with decoupling have been considered using the concept of locally partial equilibrium. The local entropy production in the neutron gas system in a power reactor depends on heat production, temperature, temperature gradients, chemical potentials, etc., which are local quantities arising from space-dependent nuclear reactions. Such local entropy production has its minimum value in the steady state. The local distribution function of the neutron gas in a power reactor is expressed by the generalized Boltzmann distribution specified by the respective generalized activity coefficient or the respective generalized chemical potential for each subsystem. (author)