Development of state categorization model for necessity of feed and bleed operation and application to OPR1000
نویسندگان
چکیده
Since nuclear power plant (NPP) has lots of functions and systems, operated procedure is much complicated and the chance of human error to operate the safety systems is quite high when an accident occurs. There are two approaches to cool down the reactor coolant system (RCS) after an accident in a NPP. One is heat removal by a secondary side and the other is heat removal by a feedand-bleed (F&B) operation. The F&B operation provides residual heat removal when secondary system is not available. It is difficult to decide initiating the F&B operation because the radioactive coolant is released to the containment during F&B operation. A state categorization model to qualitatively analyze the necessity and effect of F&B operation was developed. Sequences of RCS conditions when heat removal by secondary side fails are identified to two events: non-LOCA and LOCA. The proposed model has five levels to inform the necessity and effect of F&B operation qualitatively and component failure state to inform the unavailability of F&B operation. Thermal hydraulic analysis is performed to ascertain the boundary of each level in OPR1000. The boundary of successful F&B operation of OPR1000 was identified.
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