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:
Jan. 01, 1990
Filed:
Sep. 29, 1988
Applicant:
Inventors:
George A Sofer, Bellevue, WA;
James L Maryott, Richland, WA;
Assignee:
Advanced Nuclear Fuels Corporation, Bellevue, WA (US);
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
G21C / ; G21C / ;
U.S. Cl.
CPC ...
376428 ; 376435 ;
Abstract
The fuel pellets inside the fuel rods of a boiling water reactor are made with a lower enrichment concentration in the axial radial region and a higher concentration near the peripheral radial region to reduce thermal expansion effects upon sudden rises in temperature of the pellet when the reactor power is abruptly increased by a rapid step-wise withdrawal of a control rod. At least rods immediately adjacent the control rods contain pellets of this type, but additional rods may also be of this construction.