Abstract
Flapper Spurious opening during reactor operation is one of the most perilous accidents for pool-type research reactors. In TRR during such event, if none of SCRAMs could shut-down reactor, partially fuel elements burn-out is occurred. To avoid that, a core cooling condition monitoring system is developed. There are also other PIEs, i.e. fuel element coolant inlet blockage or unintended fuel withdrawal, which can be detected by core DP. In flapper opening scenario, the experiments show core DP response is very tangible. About two other scenarios, results indicate core DP is capable to detect the abnormality in the core flow, but maybe some other supplementary data and signal are required to distinguish the accident. Preliminary data from the system exploitation during reactor operation are analyzed to take into account the uncertainties of various normal operation conditions and determine a minimum allowed working window for the system safety signal.
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