The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Nov. 17, 2015
Filed:
Oct. 18, 2011
Jae-ho Yang, Daejeon, KR;
Keon-sik Kim, Daejeon, KR;
Kun-woo Song, Daejeon, KR;
Jong-hun Kim, Daejeon, KR;
Young-woo Rhee, Daejeon, KR;
Dong-joo Kim, Daejeon, KR;
Chill-sun Ryu, Daejeon, KR;
Jae-Ho Yang, Daejeon, KR;
Keon-Sik Kim, Daejeon, KR;
Kun-Woo Song, Daejeon, KR;
Jong-Hun Kim, Daejeon, KR;
Young-Woo Rhee, Daejeon, KR;
Dong-Joo Kim, Daejeon, KR;
Chill-Sun Ryu, Daejeon, KR;
Korea Atomic Energy Research Institute, Daejeon, KR;
Korea Hydro & Nuclear Power Co. Ltd., Seoul, KR;
Abstract
Provided are a method of controlling the compositional gradient and solubility of doped-additives at grain boundaries during sintering of a uranium-based oxide green pellet including the additives, and a method of manufacturing a sintered nuclear fuel pellet having a large grain size using the same. The grain boundary solubility of the doped-additives is maintained at a certain level by stepwise varying of an oxygen partial pressure during isothermal sintering of a uranium-based oxide green pellet including the additives. The method of manufacturing a sintered nuclear fuel pellet having a large grain size includes preparing additive mixed uranium oxide powder, forming an additive mixed uranium oxide green pellet using the mixed powder, heating the green pellet to a sintering temperature in a gas atmosphere having a low oxygen partial pressure, and sintering while a sintering gas atmosphere is changed to stepwise increase an oxygen partial pressure at the isothermal sintering temperature.