PROACTIVE SOURCE TERM MONITORING AT CANDU® STATIONS


11th International Conference on CANDU® Maintenance and Nuclear Components - 2017 Oct. 01-04

Presented at:
11th International Conference on CANDU® Maintenance and Nuclear Components
2017 Oct. 01-04
Location:
Toronto, ON Canada
Session Title:
Advances in Inspection and Monitoring Techniques 2 - New Monitoring Techniques

Authors:
Y. Verzilov (KINECTRICS)
D. Trudell (KINECTRICS)
  

Abstract

The radiation fields around the reactor components have a significant impact on the planning and execution of required maintenance and inspection activities; at the same time, they also carry the signatures of the various processes that reflect the state of health of the reactor components and systems. The variations in their spatial and radionuclide compositions are formed by corrosion of the carbon steel feeders, materials released by the movement of fuel along pressure tube surfaces during refueling, fuel failures, and wear of the various system components such as pump seals, valve hard facings and bearings. The monitoring of the radiation fields and detailed radionuclide characterization, station operation information and subsequent integration with reactor artifact data, and interpretation of the observed results are the vital modules of the source term monitoring (STM) program at CANDU stations. The results of the STM analysis allow for prediction of the future outage gamma fields and subsequent optimization of the radiation jobs during the maintenance and inspections activities through virtual job planning. Recent innovations and advancements in the STM program allow for 3D virtual reality job simulation for radioactive environments around various CANDU® reactor components. Integrating the information on the radiation fields with station operational information is key to gaining an understanding of the cause and effect relationships of chemistry, operations, and system health of the various reactor systems in order to decrease the radiation fields. The information gained from the STM program also provides insights into the actual performance of the purification systems.

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