On Estimation of the Wave Loads on the MS NAKHODKA at the Accident

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  • ナホトカ号事故時の波浪外力の推定
  • ナホトカゴウ ジコジ ノ ハロウ ガイリョク ノ スイテイ

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Abstract

MS Nakhodka broke down into halves all of sudden on January 2 of 1997 in the Japan sea giving rise of serious and disastrous oil spill to the coastline of Japan. During the inquiry of the cause of the accident, one of the main tasks of the inquiry committee was to identify external loads which made the ship structure collapse. Among several scenarios for the accident, the wave loads in the heavy weather at the accident was taken up as the most plausible cause after careful examination. This paper describes how the wave loads was estimated on the Nakhodka at the moment of the accident. First description is given to details of the accident including the location of the accident, sea condition, loading condition, ship's heading and speed and so forth. Then the static loads due to the distribution of the cargo weight and buoyancy is given to show the static bending moment at the accident was exceedingly on sagging side. Next the wave loads in the irregular waves calculated by nonlinear time domain simulation program SRSLAM is presented. It is shown that the bending moment in the wave reaches up to 1, 087, 800 KN*m at maximum at SS 6.9 where the hull break down presumably took place.<BR>It is cocluded that the ship broke down because the bending moment exceeded the hull strength which had been reduced due to the corrosion, by comparing with the results derived in the paper dealing with structral aspect of the ship.<BR>Furthermore discussions are given to the stochastic significance of the estimated value and nonlinear nature of the peak distribution. Also the effect of the ship speed and wave heading to the estimation is discussed.

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