scholarly journals Release of fission products from pyrocarbon-coated HTGR fuel particles during postirradiation anneals

1974 ◽  
Author(s):  
M.T. Morgan ◽  
H.J. de Nordwall ◽  
R.L. Towns
Author(s):  
R. J. Lauf

Fuel particles for the High-Temperature Gas-Cooled Reactor (HTGR) contain a layer of pyrolytic silicon carbide to act as a miniature pressure vessel and primary fission product barrier. Optimization of the SiC with respect to fuel performance involves four areas of study: (a) characterization of as-deposited SiC coatings; (b) thermodynamics and kinetics of chemical reactions between SiC and fission products; (c) irradiation behavior of SiC in the absence of fission products; and (d) combined effects of irradiation and fission products. This paper reports the behavior of SiC deposited on inert microspheres and irradiated to fast neutron fluences typical of HTGR fuel at end-of-life.


1993 ◽  
Vol 202 (1-2) ◽  
pp. 47-53 ◽  
Author(s):  
Kazuo Minato ◽  
Toru Ogawa ◽  
Kousaku Fukuda ◽  
Hajime Sekino ◽  
Hideyuki Miyanishi ◽  
...  

1978 ◽  
Author(s):  
R. R. Suchomel ◽  
D. P. Stinton ◽  
M. K. Preston ◽  
J. L. Heck ◽  
B. J. Bolfing ◽  
...  
Keyword(s):  

2016 ◽  
Vol 697 ◽  
pp. 852-857
Author(s):  
Rong Li ◽  
Bing Liu ◽  
Chun He Tang

TRISO coated fuel particle is the most important component in HTR fuel, the silicon carbide (SiC) coating layer is regarded as the pressure vessel to contain the fission products. During reactor operation, the inner pressure resulting from fission products and pyrocarbon (PyC) thermal effect will contribute to the failure of TRISO-coated particles. The higher temperature will result in the increasing of inner pressure and PyC thermal expansion, which will then change the stress of SiC layer. Considering the effects of temperature on inner-pressure expansion and elastic strain into the pressure vessel failure model, thermal effects on the stress of TRISO-coated particles were studied with analytical solution. The results indicated that the effects of inner pressure on the particle stresses were increasingly highlighted at the late stage of irradiation. And the increasing temperature caused a slight effect on PyC elastic modulus while elastic strain is unaffected greatly, either. Therefore, CFP stresses remain unchanged basically.


Carbon ◽  
1973 ◽  
Vol 11 (6) ◽  
pp. 692
Author(s):  
W.J Lackey ◽  
W.H Pechin ◽  
J.D Sease
Keyword(s):  

1991 ◽  
Vol 26 (9) ◽  
pp. 2379-2388 ◽  
Author(s):  
Kazuo Minato ◽  
Toru Ogawa ◽  
Satoru Kashimura ◽  
Kousaku Fukuda ◽  
Ishio Takahashi ◽  
...  

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