G21C3/00—Reactor fuel elements and their assemblies; Selection of substances for use as reactor fuel elements
G21C3/02—Fuel elements
G21C3/04—Constructional details
B—PERFORMING OPERATIONS; TRANSPORTING
B63—SHIPS OR OTHER WATERBORNE VESSELS; RELATED EQUIPMENT
B63B—SHIPS OR OTHER WATERBORNE VESSELS; EQUIPMENT FOR SHIPPING
B63B19/00—Arrangements or adaptations of ports, doors, windows, port-holes, or other openings or covers
B63B19/12—Hatches; Hatchways
B63B19/14—Hatch covers
B63B19/19—Hatch covers foldable
B63B19/203—Hatch covers foldable actuated by cables or the like
Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION