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FHTS is a major extension to the existing ESATAN thermal analyser. It is capable of carrying out one dimensional steady state or transient analysis, solving for pressure, temperature and mass flow rate, for single or two phase loops. This paper begins by giving an overview of the capabilities of FHTS and outlines the stringent quality assurance standards adhered to during its development. The coding standards ensure software verification during its development via module testing and the development of a test suite. Further verification of both the single phase and two phase capability has already been carried out by comparison against Retran, a well established package used throughout the Nuclear Industry. An outline of the results from this work and conclusions drawn is given. Although limited in scope the work proved extremely valuable.