Reliability assessment is concerned with the analysis of devices and systems whose individual components are prone to fail. This reliability analysis documents the process and results of reliability determination of the JEM-EUSO Photomultiplier tube component using the methods 217 Plus, Quantum efficiency degradation and radiation hardness assurance. In conclusion, the levels of damage suffered by the PMTs which comprise the focal surface of JEM-EUSO Space Telescope, are acceptable. The results show as well that the greatest contribution to the failure is due to radiation SET. The guaranteed performance of this equipment is a 99.45%, an accepted value of reliability thus fulfilling the objectives and technological challenges of JEM-EUSO. It should be noted that the reliability values of the Standard 217Plus, despite being a standard improved, and an updated version of MIL-HDBK-217 Plus does not have sections that include the analysis of radiation of space electronic equipment. The recommendation from this study is the inclusion of all real failure effects may face an electronic, mechanical, optical space equipment.
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