Conference Proceedings Paper
Major Rehabilitation of the Bruce A Heat Transport Heavy Water Upgrader and Effect on Overall Upgrader System and Tower Packing Performance
9th International Conference on CANDU® Maintenance - 2011 December 04-06
Ram Davloor (Bruce Power)
Gretel Steinberg (SLN-Aecon)
Anthony Busigin (NITEK USA Inc.)
Salwan Saeed (Bruce Power)
Before shutdown in 1997, the Bruce A Heat Transport Heavy Water Upgrader was unable to produce high purity heavy water. Following rehabilitation in 2006-2009, upgrader performance was fully restored, significantly increasing site heavy water capability to support operating units. This paper describes the major modifications and maintenance. The main cause of previous poor product quality was not packing degradation, as previously thought, but a severely fouled reboiler and poor process control. Performance data, including tower isotopic profile is provided. A simulation model was developed to improve monitoring and to optimize performance. The model determines the theoretical plates in each stage.
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