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A model for estimation of reactor spurious shutdown rate considering maintenance human errors in reactor protection system of nuclear power plants |
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| Authors: | M Khalaquzzaman Man Cheol Kim |
| Affiliation: | a Nuclear and Quantum Engineering Department, Korea Advanced Institute of Science and Technology, 373-1 Guseong-dong, Yuseong-gu, Daejeon 305-701, Republic of Korea b Integrated Safety Assessment Team, Korea Atomic Energy Research Institute, 1045, Daedeok - daero, Daejeon, 305-353, Republic of Korea |
| Abstract: | Modeling of spurious activations in safety instrumented systems has been studied for over a decade. The spurious activation of a plant protection system in nuclear power plants (NPPs) leads to increased electricity generation cost. An in-depth view on spurious activation of digital plant protection systems of NPPs for human errors in maintenance tasks is presented in this paper. A new model which considers human errors in maintenance and periodic tests to predict component failure rates is presented. The model has been applied to OPR-1000 reactor protection system for quantification of spurious trip frequency by fault-tree analysis. The major causes of spurious activation in a nuclear reactor protection system are identified. A set of case studies has been performed with the variation of magnitudes of human errors probability and maintenance strategies, in which, the human errors in maintenance are found to significantly influence reactor spurious trip frequency. This study is expected to provide a useful mean to designers as well as maintainers of the digital reactor protection system to improve plant availability and safety. |
| Keywords: | BS bistable CCF common cause failure CEDM control element drive mechanism CPC core protection calculator DPPS digital plant protection system ESFAS engineered safety feature actuation system FOT fiber optic transmitter FTA fault-tree analysis HEP human error probability IM input module LCL local coincidence logic LCLHM LCL hardware module OM output module OPR optimized power reactor PM processor module PS power supply system RPS reactor protection system STR spurious trip rate STR2oo4 spurious trip rate for a system with two-out-of-four logic configuration TCB trip circuit breaker THERP technique for human error rate prediction 2oo4 two-out-of-four Maintenance human error human error in maintenance tasks |
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