TOP NOZZLE FOR NUCLEAR FUEL ASSEMBLY HAVING SPRING INSERT HOLE IMPROVED IN FASTENING STABILITY AND METHOD OF MANUFACTURING THE SAME

• Main Authors: SUH JUNG MIN, HA DONG GEUN, JEON KYEONG LAK, PARK NAM GYU, LEE JIN SEOK, PARK JOON KYOO, GWON GI-JUN, EOM KYONG BO, KIM JIN SUN, KIM KYOUNG JOO
• Format: Patent
• Language: English
• Published: 04.10.2012
• Subjects: COMBINED OPERATIONS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR; NUCLEAR ENGINEERING; NUCLEAR PHYSICS; NUCLEAR REACTORS; OTHER WORKING OF METAL; PERFORMING OPERATIONS; PHYSICS; REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGYGENERATION, TRANSMISSION OR DISTRIBUTION; TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION; TECHNICAL SUBJECTS COVERED BY FORMER USPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS; TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINSTCLIMATE CHANGE; TRANSPORTING; UNIVERSAL MACHINE TOOLS

A top nozzle is provided. The top nozzle can include a coupling plate, a perimeter wall and a hold-down spring unit. The coupling plate can be coupled to a guide thimble of the nuclear fuel assembly. The perimeter wall can protrude upwards from the perimeter of the coupling plate. A spring clamp can be provided on the upper surface of the perimeter wall. The hold-down spring unit can be mounted to the upper surface of the perimeter wall in such a way to couple a corresponding end of the hold-down spring unit to the spring clamp. A fastening pin hole can be vertically formed through an upper surface of the spring clamp. A spring insert hole into which the hold-down spring unit can be inserted and formed by electro-discharge machining in an insert direction of the hold-down spring.