Testing of a Prototype PWR Design Gamma Thermometer for Use as a Local Power Monitor in the Thimble Tube of a Nuclear Reactor

Out-of-pile tests were performed on a 0.185-in. OD gamma thermometer (GT) designed for insertion in existing thimble tubes of W- pressurized water reactors (PWR). The experimental measurements were conducted with the GT inserted in a simulated thimble tube. The measurements were performed to examine...

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Bibliographic Details
Published in:IEEE transactions on nuclear science 1984-01, Vol.31 (1), p.754-756
Main Authors: LeVert, F. E., Kress, R. L., Bell, D. L.
Format: Article
Language:English
Subjects:
Delay
Fission reactors
Inductors
Instruments
Linearity
Monitoring
Performance evaluation
Prototypes
Testing
Time measurement
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Summary:Out-of-pile tests were performed on a 0.185-in. OD gamma thermometer (GT) designed for insertion in existing thimble tubes of W- pressurized water reactors (PWR). The experimental measurements were conducted with the GT inserted in a simulated thimble tube. The measurements were performed to examine the effect on the sensitivity, response time, and repeatability of the GT output signal when surrounded by an ai r-and a water-filled thimble tube with random and controlled physical contact between the two units. The results showed that the linearity of the instrument is not affected when operated in an air- or water-filled thimble tube. However, the response time of the GT to a step change in power increased from 9 s to about 30 s for water and dry thimble tube conditions respectively. Results are also presented which show that the sensitivity, mV/W/cm3, of the GT with and without controlled physical contact between the inner surface of the simulated thimble tube and the outer surface of the GT did not vary significantly.
ISSN:0018-9499
1558-1578
DOI:10.1109/TNS.1984.4333360