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Failure mode and reliability study for Electrical Facility of the High Temperature Engineering Test Reactor
بررسی حالت خرابی و قابلیت اطمینان برای تاسیسات الکتریکی راکتور آزمایشی مهندسی دما بالا-2021 The first-of-a-kind commercial electricity and hydrogen cogeneration system is being designed by the Japan
Atomic Energy Agency (JAEA) to establish the industrial application of the High Temperature Gas-cooled
Reactors (HTGR). The High Temperature Engineering Test Reactor (HTTR) is expected to be coupled with a
test cogeneration plant to demonstrate its safety features and justify further HTGR technology development.
The aim of this work was to assess the frequency of the unplanned outages of such a plant due to the failures of
the HTTR Electrical Facility. The system analysis has been performed followed by the Failure Mode and Effect
Analysis (FMEA). The new FMEA-based Gradual Screening Approach has been proposed and applied in order
to select the most relevant failure modes. The initial calculation performed for the standard configuration of
the system indicated that the reliability may be insufficient for its long-term commercial operation, as planned
for about 20 years. Therefore, several modifications of the design have been proposed, aiming at the reliability
enhancement. However, the updated results are still below the industrial standards. This opens up a new field
of research in reliability engineering and creates a challenge for the HTGR-based cogeneration plants consisting
of the joint nuclear-chemical facilities.
Keywords: HTTR reactor | Electrical Facility | FMEA-based Gradual Screening | Nuc-Chem facility | Reliability |
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