Behaviour of iodine species in the Windscale AGR
Journal Article
·
· J. Brit. Nucl. Energy Soc., v. 12, no. 4, pp. 443-446
OSTI ID:4397402
Several fuel pins with deliberately defective cans were irradiated in the windscale AGR. Associated with these experiments, a /sup 131/I monitoring programme was carried out, in which CO/sub 2/ coolant from channels containing this experimental fuel, and from other channels, was passed through samplers that permitted the physical and chemical form of the iodine to be assessed by selective filtration sorption or reaction. The release of iodine from operational fuel pin failures was also studied. A separate experiment, in which methyl iodide was injected into the reactor coolant circuit, was carried out. The results indicated that the /sup 131/I release is principally in the form of methyl iodide. The iodine has a chemical decomposition half-life of 2 1/2 min, similar to that of methyl iodide injected into the coolant circuit. This half- life corresponds to a value of 4500 for the ratio of steady-state /sup 131/I release from the fuel pin to that remaining gas-borne, which is the decontamination factor. It also corresponds to a deposition velocity of 0.02 cm/ sec to the cooler parts of the heat exchangers where iodine was found to be deposited. (UK)
- Research Organization:
- United Kingdom Atomic Energy Authority, Sellafield, Eng.
- NSA Number:
- NSA-29-011800
- OSTI ID:
- 4397402
- Journal Information:
- J. Brit. Nucl. Energy Soc., v. 12, no. 4, pp. 443-446, Journal Name: J. Brit. Nucl. Energy Soc., v. 12, no. 4, pp. 443-446; ISSN JBNSA
- Country of Publication:
- United Kingdom
- Language:
- English
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Related Subjects
*WAGR REACTOR-- FISSION PRODUCTS
DECONTAMINATION
DEFECTS
DEPOSITION
DEPOSITS
FAILED ELEMENT DETECTION
FAILURES
FUEL PINS
HALF-LIFE
HEAT EXCHANGERS
IODINE 131
IRRADIATION
METHYL IODIDE
N77300* --Reactors--Power Reactors
Non-breeding
Graphite Moderated
ORGANIC IODINE COMPOUNDS
PRIMARY COOLANT CIRCUITS
RADIATION MONITORING
REACTOR COOLING SYSTEMS
SAMPLING
DECONTAMINATION
DEFECTS
DEPOSITION
DEPOSITS
FAILED ELEMENT DETECTION
FAILURES
FUEL PINS
HALF-LIFE
HEAT EXCHANGERS
IODINE 131
IRRADIATION
METHYL IODIDE
N77300* --Reactors--Power Reactors
Non-breeding
Graphite Moderated
ORGANIC IODINE COMPOUNDS
PRIMARY COOLANT CIRCUITS
RADIATION MONITORING
REACTOR COOLING SYSTEMS
SAMPLING