Monitoring of Radionuclide Deposits on CANDU® Reactor Components
9th International Conference on CANDU® Maintenance - 2011 December 04-06

Presented at:
9th International Conference on CANDU® Maintenance
2011 December 04-06
Toronto, Canada
Session Title:
Chemistry/Dose Control Session A2

Yury Verzilov (Kinectrics Inc.)
Aamir Husain (Kinectrics Inc.)


The deposition of activation and fission products on out-core surfaces of a CANDU® reactor leads to the appearance of gamma radiation fields around the primary heat transport (PHT) and moderator system components.  Information on radionuclide deposits is required to perform various assessments, such as the effects of chemistry changes on radiation fields, evaluate the effect of source term reduction technologies and for decontamination planning.  This information can be obtained by performing Outage Activity Transport Monitoring (OATM) surveys around various reactor components during an outage.  The surveys are based on both the dose rate and gamma spectrometry measurements.  This paper presents selected results on radioactivity deposits from recent OATM surveys performed at CANDU stations. 

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