Irradiation effects on fuels for space reactors
Conference
·
OSTI ID:6315909
A review of irradiation-induced swelling and gas release experience is presented here for the three principal fuels UO/sub 2/, UC, and UN. The primary advantage of UC and UN over UO/sub 2/ is higher thermal conductivity and attendant lower fuel temperature at equivalent pellet diameter and power density, while UO/sub 2/ offers the distinct benefit of well-known irradiation performance. Irradiation test results indicate that at equivalent burnup, temperature, and porosity conditions, UC experiences higher swelling than UO/sub 2/ or UN. Fission gas swelling becomes important at fuel temperatures above 1320 K for UC, and at somewhat higher temperatures for UO/sub 2/ and UN. Evidence exists that at equivalent fuel temperatures and burnups, high density UO/sub 2/ and UN experience comparable swelling behavior; however, differences in thermal conductivity influence overall irradiation performance. The low conductivity of UO/sub 2/ results in higher thermal gradients which contribute to fuel microcracking and gas release. As a result UO/sub 2/ exhibits higher fractional gas release than UN, at least or burnups up to about 3%.
- Research Organization:
- Los Alamos National Lab., NM (USA); Engineering Science and Analysis, Idaho Falls, ID (USA)
- DOE Contract Number:
- W-7405-ENG-36
- OSTI ID:
- 6315909
- Report Number(s):
- LA-UR-84-2651; CONF-840113-10; ON: DE84016460
- Country of Publication:
- United States
- Language:
- English
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