Failed fuel locating
Patent
·
OSTI ID:4393047
A method for the location of failed fuel elements by detecting the presence of radioactive fission products in the coolant of a nuclear reactor and a device for this purpose are described. A sample chamber is connected to each reactor pressure tube with tubing sized to give a continuous flow of coolant through each sample chamber and a delay time of about 45 seconds. Neutron detectors are inserted into the sample chambers by reducing the air pressure which normally suspends detectors above the sample chambers. The detectors contain neutron sensitive targets of fissionable material such as /sup 235/U and solid-state nuclear track detecting material. Exposure of the detector to radiation is limited to the time when a burst of neutron emitting products released from a defected fuel element by a power cycle will be present in the coolant in the corresponding sample chambers. Residence time in the sample chamber cavity is normally 1--5 minutes. Air pressure is increased to return detectors to their rest positions and the detectors are then examined for track damage. (CA)
- Research Organization:
- Originating Research Org. not identified
- NSA Number:
- NSA-29-012169
- OSTI ID:
- 4393047
- Report Number(s):
- CA 912712
- Country of Publication:
- Canada
- Language:
- English
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