This caper is the first phase report in the investigation of Tension Leg Platform in CSSRC. A series of tests and computational work have been performed for a four column TLP in 256m water depth under the influence of waves.

Attention was paid to investigate the effect of variation of pretension of tether load and pontoon configuration on the behaviour of TLP in waves. Survival condition for the TLP was also investigated, including a case study of leg failure in storm waves.

Results of computations based on 3D potential theory by CRS-WAVE are compared with results of model tests. The applicability of the method is confirmed.

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