Parameter Estimation of a Reliability Model of Demand-Caused and Standby-Related Failures of Safety Components Exposed to Degradation by Demand Stress and Ageing That Undergo Imperfect Maintenance

<table class="table-group" id="tab1"><tr><td><table class="table"><tr><td class="thead-hr" colspan="4"><hr/></td></tr><tr class="thead"><td class="align_left">Failure time [h]</td><td class="align_center">Equipment</td><td class="align_center">Failure cause</td><td class="align_center">Failure mode</td></tr><tr><td class="thead-hr" colspan="4"><hr/></td></tr><tr><td class="align_left">384</td><td class="align_center">MOV2</td><td class="align_center">Motor circuit breakers degraded</td><td class="align_center">Standby</td></tr><tr><td class="align_left">23472</td><td class="align_center">MOV1</td><td class="align_center">Fail to open. Limit switches fail</td><td class="align_center">Demand</td></tr><tr><td class="align_left">24336</td><td class="align_center">MOV1</td><td class="align_center">Fail to open. Limit switches fail</td><td class="align_center">Demand</td></tr><tr><td class="align_left">27024</td><td class="align_center">MOV2</td><td class="align_center">Fail to open. Limit switches fail</td><td class="align_center">Demand</td></tr><tr><td class="align_left">56424</td><td class="align_center">MOV1</td><td class="align_center">Motor circuit breakers burned</td><td class="align_center">Standby</td></tr><tr><td class="align_left">94512</td><td class="align_center">MOV1</td><td class="align_center">Fail to open. Limit switches fail</td><td class="align_center">Demand</td></tr><tr><td class="align_left">94584</td><td class="align_center">MOV1</td><td class="align_center">Fail to open. Throttle misadjusted</td><td class="align_center">Demand</td></tr><tr class="table-tr"><td colspan="4"><hr class="tbody-hr"/></td></tr></table></td></tr></table>

Failure data collected for two identical motor-operated valves of a nuclear power plant.

Mathematical Problems in Engineering

tab1

Table 1

Table 1: Parameter Estimation of a Reliability Model of Demand-Caused and Standby-Related Failures of Safety Components Exposed to Degradation by Demand Stress and Ageing That Undergo Imperfect Maintenance 

Table 1 | Parameter Estimation of a Reliability Model of Demand-Caused and Standby-Related Failures of Safety Components Exposed to Degradation by Demand Stress and Ageing That Undergo Imperfect Maintenance 