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:
Jun. 26, 2001
Filed:
Jul. 19, 1999
Kun-Woo Song, Daejeon-Si, KR;
Keon-Sik Kim, Daejeon-Si, KR;
Ki-Won Kang, Daejeon-Si, KR;
Jong-Hun Kim, Daejeon-Si, KR;
Youn-Ho Jung, Daejeon-Si, KR;
Other;
Abstract
Disclosed is a method of manufacturing large-grained uranium dioxide pellets through the use of U,O,single crystals. The method consists of two main steps; producing U,O,single crystals and manufacturing large-grained UO,pellets. The U,O,single crystals are produced by annealing U,O,powder to make U,O,polycrystalline aggregates having a large crystal size, and by dividing the U,O,polycrystalline aggregate into its constituent U,O,single crystals. Large-grained UO,pellets are produced by forming a mixture comprising UO,powder and the U,O,single crystals, making granules of the mixture, pressing the granules into green pellets, and sintering the green pellets above 1600° C. for more than one hour in a reducing gas. The U,O,powder is produced preferably by heating defective UO,pellets in air to oxidize UO,to U,O,. The invention provides a method of manufacturing a large-grained UO,pellet with defective pellets reused.