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Article

Preliminary Analysis of a Fully Ceramic Microencapsulated Fuel Thermal–Mechanical Performance

1
Shanxi Key Lab. of Advanced Nuclear Energy and Technology, School of Nuclear Science and Technology, Xi’an Jiaotong University, Xi’an 710049, China
2
Science and Technology on Reactor System Design Technology Laboratory, Nuclear Power Institute of China, Chengdu 610200, China
*
Authors to whom correspondence should be addressed.
Mathematics 2019, 7(5), 448; https://doi.org/10.3390/math7050448
Received: 20 March 2019 / Revised: 29 April 2019 / Accepted: 30 April 2019 / Published: 20 May 2019
(This article belongs to the Special Issue Mathematical Physics II)
In this paper, a two-dimensional characteristic unit was used to simulate the thermal–mechanical performance of a fully ceramic microencapsulated (FCM) fuel pellet, and the criterion of FCM structure integrity was discussed. FCM structure integrity can be reflected though the integrity of the silicon carbide (SiC) matrix or SiC layers because of the excellent fission retention capability of SiC ceramics. The maximum temperature of the SiC matrix under normal conditions of the pressure water reactor (PWR) environment was about 1390 K, which was lower than the decomposition point of SiC. The maximum hoop stress of the SiC matrix, especially the inner part, was up to about 1200 MPa, and the hoop stress of the non-fuel region part was lower than the inner part, which can be attributed to the deformation of tristructural-isotopic (TRISO) particles. The hoop stress of the SiC layers at the end of life was only about 180 MPa, which is much lower than the strength of the chemical vapor deposition (CVD)-SiC. The failure probability of the SiC layer was lower than 9 × 10−5; thus, the integrity of SiC layers and the fission retention capability were maintained. The structure integrity of FCM fuel was broken because the SiC matrix cracked. View Full-Text
Keywords: FCM fuel; thermal–mechanical performance; failure probability; silicon carbide FCM fuel; thermal–mechanical performance; failure probability; silicon carbide
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MDPI and ACS Style

Chen, P.; Qiu, S.; Liu, S.; Zhou, Y.; Xin, Y.; Gao, S.; Qiu, X.; Lu, H. Preliminary Analysis of a Fully Ceramic Microencapsulated Fuel Thermal–Mechanical Performance. Mathematics 2019, 7, 448. https://doi.org/10.3390/math7050448

AMA Style

Chen P, Qiu S, Liu S, Zhou Y, Xin Y, Gao S, Qiu X, Lu H. Preliminary Analysis of a Fully Ceramic Microencapsulated Fuel Thermal–Mechanical Performance. Mathematics. 2019; 7(5):448. https://doi.org/10.3390/math7050448

Chicago/Turabian Style

Chen, Ping; Qiu, Suizheng; Liu, Shichao; Zhou, Yi; Xin, Yong; Gao, Shixin; Qiu, Xi; Lu, Huaiyu. 2019. "Preliminary Analysis of a Fully Ceramic Microencapsulated Fuel Thermal–Mechanical Performance" Mathematics 7, no. 5: 448. https://doi.org/10.3390/math7050448

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