Although several years have passed since the development of manufacturing cast iron cask was started, and the technology of manufacturing seems established, the certification test have never carried out to prove the technology of design and quality assurance of cast iron cask. QA committee of cast iron cask proposed the idea of the criteria of the design, manufacturing and quality assurance. We performed the real size drop tests of it under the condition, 233K, to prove the criteria and the technology. The results give us the conclusions as following.
(1) The proposals of QA committee are conservative enough to avoid brittle fracture. (2) The technology of non-destructive examination is effective enough for cast iron cask. (3) The chemical components control is effective to control the mechanical properties and casting defects. We expect eagerly the time when cast iron cask is of real use under the regal authorities will come soon.
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