This preliminary PSA (Probabilistic Safety Assessment) was undertaken to assess the level of safety for the design of a research reactor and to evaluate whether it is probabilistically safe to operate and reliable to use. The scope of the PSA reported here is a Level 1 PSA that addresses the risks associated with core damage. It includes an evaluation of the types of accidents that could lead to core damage, and an assessment of their frequencies. After reviewing the documents and the conceptual design, 8 typical initiating events are selected regarding internal events during the normal operation of the reactor.
Simple fault tree models for the PSA are developed instead of the detailed model at this conceptual design stage. The failures of the major components and dependencies between systems have been considered for the fault tree analysis. Normal operating trains were assumed to have a pump, a check valve and a manual valve. The failures of pumps and supporting systems such as the electrical power are modeled, and the failure of the check valve or manual valve is also modeled for the train. Of course, the Common Cause Failure (CCF) and operator error are modeled.
The criterion for inclusion was all sequences with a point estimate frequency greater than a truncation value of 1.0E−13/yr. LOCA-I is the dominant contribution to the total CDF by a single initiating event. The CDF from the internal events of the research reactor is estimated to be 7.38E−07/year. The CDF for the representative initiating events is less than 1.0E−6/year even though conservative assumptions are used in the reliability data. The conceptual design of the research reactor is designed to be sufficiently safe from the viewpoint of safety.
The wave structure of condensate film and the characteristics of boundary layer flow in the vapor phase were investigated experimentally for condensation of steam-air mixture on a vertical surface. The instantaneous film thickness and the fluctuating temperature in the boundary layer were measured simultaneously. Also the heat transfer coefficient across the condensate film and the diffusion layer formed by air (noncondensable gas) was obtained at various film Reynolds numbers and vapor velocities. The influence of the wavy interface on the temperature field and the heat transfer depend strongly on film Reynolds number and vapor velocity. The condensation heat transfer coefficient increases more than several tens percents with the increase of film Reynolds number depending on the vapor velocity. The fluctuating temperature correlates strongly with the waviness of condensate film corresponding to film Reynolds number. The RMS (root-mean-square) of the temperature fluctuation increases considerably due to the waviness and shows a maximum value around the crest of large amplitude waves.
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