In this paper the program has been described. The results of the validation with model tests on a tanker moored with a conventional mooring system in 350 m water depth are shown. The results of the computations agree well with the results of the model tests. Finally by means of computations with the tanker moored with a conventional system with and withoutspring buoys were investigated in 400 and 1200 m water depth applications. By varying extreme metocean parameters the understanding of and the insight in the reliability and integrity in the mooring system can be improved.