| Authors |
Torgashin Sergey Ivanovich, candidate of technical sciences, director of prodaction, Scientific-research Institute of physical measurements (8/10 Volodarskogo street, Penza, Russia), inercial@niifi.ru
Papko Antonina Alekseevna, doctor of technical sciences, deputy Head of design department, Scientific-research Institute of physical measurements (8/10 Volodarskogo street, Penza, Russia), inercial@niifi.ru
Polyakova Ekaterina Alekseevna, postgraduate student, chief Specialist, Scientific-research Institute of physical measurements (8/10 Volodarskogo street, Penza, Russia), info@niifi.ru
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| Abstract |
Background. For the purpose of nuclear power plants (NPP) protection from ground surface borne vibrations, according to International Atomic Energy Agency (IAEA) recommendations, NPP must be equipped with anti-seismic protection instrumentation for reactor facilities. Nowadays the up-to-date solution for NPP safety enhancement is the usage of seismic sensors SD 4 of "NIIFI" JSC development and production with increased quality performance specifications of quality of reliability. To provide evaluation of conformity seismic sensor’s reliability to specified technical requirements it is appropriate to perform reliability calculation that provides evaluation of reliability numbers conformity prior to experimental and measurement data.
Materials and methods. The seismic sensor is a complex multichannel system; in terms of reliability it has no home-produced or international alternative sensors. To provide continuous monitoring of seismic load vector projection, separate analog signals and data on the module of measured seismic load vector are generated within the system. Computational method of reliability confirmation accounts for differences in system structure under each performed function and in intervals performs built-in check that provides safety forecasting by time intervals needed for reaching the specified values, wherein lies the method’s originality.
Results. For the purpose of computation qualitative analysis of sensor reliability has been carried out; as a result of which, sensor components, structure and limits have been defined, sensor failure and fault criteria have been described, as well as numerical reliability analysis. As follows from the analysis it is necessary to implement in the seismic sensor such function as «built-in check» which provides repetitive automatic detection of measuring routes state-ofhealth throughout the sensor operating life cycle. As a result of reliability calculation using failure rate forecasting for sensor electronic components, quantitative values of sensor reliability index have been defined.
Conclusions. Calculated reliability index of the seismic sensor complies with the requirements of the reference documentation and guarantees the sensor reliable operation with full functions performing. The carried out calculation considerably cuts the time needed to obtain the results of reliability index evaluation at this development phase and allows to forecast reliability without experiment performance.
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