Development of the Test Bed for Advanced RCS Unidentified Leakage Detection Techniques

The leakage from a RCS(Reactor Coolant System) is classified into identified leakage which is defined as leakage in to the closed system boundaries and unidentified leakage which is all other leakages. Since the reactor operates at high temperature and pressure conditions, the unidentified leakage is released by gaseous state and its amount collected in sumps is too small to be captured. However, it has significant meaning from a viewpoint of nuclear safety. The unidentified leakage was typically determined by the RCS inventory balance method that NUREG-1107 recommended. To enhance the accuracy, and robustness of the method, a kind of filtering techniques such as linear regression has been used. However, the conventional filtering techniques did not reflect the step change in any transient conditions such as injection or discharge. In order to compensate this shortcoming, we have proposed advanced techniques such as the Kalman filter and the bilateral filters. This study, as an extended part of the previous research, attempted to develop the test bed which is based on the RCS inventory balance method and is able to test various filtering techniques using LabVIEW. The test bed enables to collect the data on-line/ off-line and to perform the benchmarking tests among the filtering techniques