Development of Boron Meter Model with MCNPX

The result shows better accuracy (0.1-0.8%) in comparison with current boron meters (2%). The accuracy can be more improved by using mix set of detectors which have different sensitivity or by using additional moderator outside of the detectors. Further study will be performed with those ideas. A boron meter has been used to monitor the boron concentration of coolant continuously in a pressurized water reactor. The uncertainty of currently used boron meter is at least 2%, and the practical boron meters are supposed to show much bigger than 2%. In 2011, P. Pirat presented a new boron meter called Boronline which showed improved accuracy, however it is required to develop more accurate boron meter for safety. For that purpose, the boron meter model was developed and evaluated with Monte Carlo code MCNPX. A new boron meter model was developed and evaluated