THEORY OF DELAYED SUPERCRITICAL EXCURSIONS TO DETERMINE DOPPLER- COEFFICIENTS OF FAST REACTORS
Technical Report
·
OSTI ID:4657017
The determination of the prompt power coefficient of a fast reactor by means of special delayed superprompt critical excursions was investigated. If the reactivity is inserted as a fast ramp limited below prompt critical, the changes of the neutron flux after the prompt jump result from the competition of the increase of feed-back and delayed neutrons. The height of the prompt jump and the slope'' of the flux after the prompt jump permit the prompt power coefficient to be determined. In the special case in which the competition is complete, the prompt power coefficient is directly connected to the height of the prompt jump. The accuracy of the method is discussed extensively, and improvements in the accuracy are investigated. The achievable high accuracy can be used to test finer details of the Doppler coefficient theory, e.g., the dependence on temperature and temperature profile and on different fuel compositions in fairly small zones. (auth)
- Research Organization:
- Kernforschungszentrum. Institut fur Neutronenphysik und Reaktortechnik, Karlsruhe, Germany
- NSA Number:
- NSA-17-033242
- OSTI ID:
- 4657017
- Report Number(s):
- KFK-153
- Country of Publication:
- Germany
- Language:
- English
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