EVALUATION OF RADIOLOGICAL CONSEQUENCES DUE TO SABOTAGE DURING NUCLEAR MATERIAL TRANSPORTATION

To clarify level of unacceptable radiological consequences due to sabotage, new concept to define physical protection measures appeared in revised recommendation for nuclear material protection, INFCIRC/225/Rev.5, radiological consequences caused by sabotage during nuclear material transport were evaluated using plume model based on hypothetical scenario for release of radioactive materials. Evaluations were carried out for principal packages used for transport of nuclear material and wastes from nuclear plants. Evaluated maximum cumulative dose for 24 hours at 15 m from transport cask was approximately 4 mSv. The evaluated results shown in this paper are expected be used as base data in consideration of additional physical protection measures taking into account the new IAEA physical protection recommendation. In this study, radiological consequences due to sabotage during maritime transport of radioactive materials were also demonstrated and the results indicated that radiological consequences are lower than 1 mSv, dose limit for general public in normal condition.