Benchmark solution, Harwell. App. F-2

This paper gives the results of the UK calculations on the benchmark problem. The reactor physics computing code used most extensively at Harwell is WIMSE the Winfrith Improved Multigroup Scheme, a suite of linked reactor physics codes which was evolved for light water, heavy water and graphite moderated thermal reactors. The various codes in this suite intercommunicate via a series of interfaces carrying intermediate results such as neutron spectra, number densities, cross section data, geometry specifications etc., written on disc and read as required in subsequent stages. Such functions as lattice cell calculations using collision probability methods, spectrum weighting and cross section averaging, group condensation, editing of spectra to produce reaction rates, collision probability and neutron transport solutions in one dimensional geometry, diffusion calculations in two and three dimensions, burnup calculations etc. can all be performed consecutively by simple commands