Decontamination of Ontario hydro reactors
Within Ontario Hydro, decontamination of heat transport systems is carried out using the Candecon process. This process involves the addition of organic acidic reagents to the coolant to form a 1 g/kg D/sub 2/O solution that will dissolve and complex the corrosion product oxide layer and contained radioactivity. The solution is circulated through cation exchange resins in the purification circuit to remove complexed metals, thereby regenerating the reagent. When the cation resins are exhausted, mixed bed resins are subsequently used to remove both the reagent and the remaining corrosion products from solution. Filtration, in the form of submicron cartridge filters installed in the purification circuit, is used to remove fine particulate crud produced during the decontamination. Development of the Candecon process led to successful decontaminations of Pickering NGS Units 1 and 2 in 1984. Decontamination factors of up to 10 resulted in radiation fields of 40 to 140 mR/h at the reactor face. These low fields have been a key factor in enabling the successful replacement of all pressure tubes of Unit 1 and 2 reactors. In 1985, Pickering Unit 3 was successfully decontaminated achieving similar decontamination factors.
- OSTI ID:
- 5580163
- Report Number(s):
- CONF-870837-
- Journal Information:
- Trans. Am. Nucl. Soc.; (United States), Journal Name: Trans. Am. Nucl. Soc.; (United States) Vol. 54; ISSN TANSA
- Country of Publication:
- United States
- Language:
- English
Similar Records
DECONTAMINATION STUDIES FOR HAPO HIGH TEMPERATURE REACTOR RECIRCULATION SYSTEMS. Progress Report, June 1958-June 1959
DECONTAMINATION OF THE WAPD-29 LOOP
Related Subjects
210400* -- Power Reactors
Nonbreeding
Otherwise Moderated or Unmoderated
ACTIVITY LEVELS
BWR TYPE REACTORS
CANDU TYPE REACTORS
CLEANING
COOLING SYSTEMS
CORROSION PRODUCTS
DECONTAMINATION
DOSES
ENERGY SYSTEMS
FILTERS
HEAVY WATER MODERATED REACTORS
ION EXCHANGE
ISOTOPES
PRESSURE TUBE REACTORS
PWR TYPE REACTORS
RADIATION DOSES
RADIOISOTOPES
REACTOR COMPONENTS
REACTOR COOLING SYSTEMS
REACTORS
THERMAL REACTORS
WATER COOLED REACTORS
WATER MODERATED REACTORS