Reliability Evaluation of Radioisotope Heat Unit in Reentry Process

WU Shengna; LUO Hongyi; WU Weiming; LI Xin; TANG Xian

doi:10.7538/yzk.2020.54.02.0215

Atomic Energy Science and Technology > 2020 > 54(2): 215-221. > DOI: 10.7538/yzk.2020.54.02.0215

WU Shengna, LUO Hongyi, WU Weiming, LI Xin, TANG Xian. Reliability Evaluation of Radioisotope Heat Unit in Reentry Process[J]. Atomic Energy Science and Technology, 2020, 54(2): 215-221. DOI: 10.7538/yzk.2020.54.02.0215

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Reliability Evaluation of Radioisotope Heat Unit in Reentry Process

Department of Isotope, China Institute of Atomic Energy, Beijing 102413, China

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Abstract

In this paper, the uncertainties of material resistance and applied loading were considered comprehensively. According to the structural characteristics of radioisotope heat unit (RHU), the stress-strength interference model based on stochastic finite element method was sele-ted, and the method of combining analytical method with Monte Carlo ethod was used to evaluate the reliability level of the RHU which experiences a series of environmental loads in the process of reentry under the condition of limited scale of tests. Through the method described in this paper, it is calculated that the lower confidence limit of reliability of some kind of RHU under 95% confidence is 0.999 989, which meets the reliability evaluation accuracy requirements of general detector parts. The above results show that the method described in this paper is practical and reliable, and has a strong practical value in reliability evaluation of RHU, guiding reliability design of RHU and reducing evaluation cost.

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