Projeto de segurança física nuclear para depósito intermediário de rejeitos radioativos

Abstract

The present work aimed to describe, present and evaluate a nuclear physical security project for a fictitious installation of an intermediate radioactive waste deposit, following international and national security criteria. Therefore, it carried out an evaluation of the Physical Protection System (SisPF) applying the DEPO (Design and Evaluation Process Outline) methodology with a sequence of three phases of the protection system design and assessment of its vulnerabilities. The overall assessment of SisPF was performed from the calculation of the overall probability of system effectiveness (PE) through the methods of adversary sequence diagrams, path analysis and neutralization analysis. SisPF presented a PE value of only 6.5%, three improvements were proposed and their impacts analyzed. The reduction of the response time of the security force led to a value of 78% of the PE and the increase of the delay time (TD) in the barriers closer to the target made the SisPF efficiency reach 92%, higher than the acceptable value of 85%. The results showed that the evaluation of the proposed fictitious project allowed adaptations so that the ideal level of SisPF effectiveness could be reached with few interventions. The initial project was prepared in accordance with current regulations (traditional prescriptive approach) and, even so, presented a low probability of overall effectiveness, leading to the need for adjustments that were only possible by applying the DEPO methodology (performance-based approach).