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제안 방법
- An analysis methodology to simulate the cumulative damage from a drop condition to a puncture condition was proposed. Analyses and tests with a preliminary test model and with a cask model were conducted. By the analyses and tests with the preliminary model, the method to evaluate the cumulative damage was verified.
- In this research, a safety assessment of a dual purpose metal cask that is currently under development by Korea Radioactive Waste Management Corporation (KRMC) is performed using numerical simulation and tests. A scenario of a targeted aircraft crash is established from a literature survey and impact conditions are derived from the scenario.
- This is due to difficulties in reflecting the final results of the previous analysis on the current analysis. In this study, as the first step to consider cumulative damage, an analysis technology to perform a puncture analysis reflecting the final response field resulting from a drop analysis is proposed. The necessity and validity of the proposed analysis technology are evaluated by comparison with the results obtained by performing each analysis independently.
- 7. Sequential drop tests were conducted for the cask test model with the same drop conditions as those of the analysis. A side drop and a side puncture were performed sequentially.
- The second step of the evaluation utilizes a detailed model to evaluate the structural response of the cask components upon the missile impact. The main focus of the evaluation is to examine the integrity of the containment of the cask. Dynamic material properties considering the strain rate effect are utilized in the simulation and bolt pretention is applied using dynamic relaxation.
- There are many challenging design issues related to the development of transportation and storage of spent fuels. The major design issues for such development include radiation shielding analyses, fuel safety verification, thermal evaluations, structure and impact analyses including seismic safety and containment analyses, along with radiation protection, confinement of radionuclides, and service life verification of main component materials. These analyses must be followed by accident evaluations to ensure that radiological consequences due to off-normal and accident events during transferring and storage of spent fuels are acceptably low.
- In this study, as the first step to consider cumulative damage, an analysis technology to perform a puncture analysis reflecting the final response field resulting from a drop analysis is proposed. The necessity and validity of the proposed analysis technology are evaluated by comparison with the results obtained by performing each analysis independently.
- For the test, two simple canister structures were fabricated. The sequential drop tests were conducted for the first canister model with the same drop conditions as those of the analysis. A bottom down drop and a side puncture were performed sequentially with the first canister.
- The test was performed in the ADD testing site using CMG as in Case 1 evaluation. The missile velocity was measured as 155 m/s and the behavior after the impact is shown in Fig.
- As the importance of safety is increasingly emphasized, there is a demand to demonstrate the integrity of storage and transportation systems of spent fuel under circumstances even beyond design basis accidents such as an aircraft crash. This paper introduces two topics, a structural analysis methodology to assess cumulative damage on transportation packages and the effects of an aircraft engine crash on a dual purpose cask. These newly emerging issues are selected from among the many technical issues related to the development of transportation and storage of spent fuels.
- Therefore, the second method should be applied when the software does not provide this function. To develop and verify the analysis methodology to evaluate cumulative damage, a preliminary model and a cask model were utilized.
대상 데이터
- For the test, two simple canister structures were fabricated. The sequential drop tests were conducted for the first canister model with the same drop conditions as those of the analysis.
- The simplified missile weighs 167 kg and its diameter is 355 mm. It is made of carbon steel.
- The test was performed in the testing site of the Agency of Defense Development (ADD). The missile was fired using a Counter Mass Gun (CMG) and the velocity of the missile was measured as 148 m/s. The behavior of cask after the impact is shown in Fig.
- The simplified missile weighs 167 kg and its diameter is 355 mm. It is made of carbon steel.
- The test was performed in the testing site of the Agency of Defense Development (ADD). The missile was fired using a Counter Mass Gun (CMG) and the velocity of the missile was measured as 148 m/s.
이론/모형
- The aircraft crash scenario was set based on a NEI report. A large commercial aircraft B747 is selected and the impact velocity is set as 150 m/s, which is the measured velocity of the aircraft that struck the Pentagon on 9/11.
- 1. The cumulative damage was simulated by using the LSDyna explicit code. We can see the plastic deformation from the bottom down drop at the left side of Fig.
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