Method and apparatus for displacing a reactor weld scanner assembly by variable buoyancy

Patent · Tue Aug 11 00:00:00 EDT 1987

OSTI ID:6157107

Zwart, Jr, B M

A method is described of displacing a weld scanner in and out of a horizontal reactor vessel nozzle, wherein two spaced vertical guide studs extend upwardly from an upper circular vessel flange approximately 120 degrees apart with the studs and vessel submerged in a water pool. The scanner is mounted on a horizontal positively driven telescopic boom to which a vertical column is attached which is slideable between stop limits and rotatable within and can be braked with respect to a hub of a spider having three equally spaced legs adapted to span the flange with clamps on the outer ends of two of the legs adapted to slide on and grip two of the studs, each of the columns and spider legs defining one buoyancy chamber and the boom defining two fore and aft buoyancy chambers into which air and water may be introduced.

• Assignee: Nuclear Energy Services, Inc., Danbury, CT
• Patent Number(s): US 4686078
• OSTI ID: 6157107
• Resource Relation: Patent File Date: Filed date 8 Apr 1985
• Country of Publication: United States
• Language: English

Related Subjects

22 GENERAL STUDIES OF NUCLEAR REACTORS
REACTOR MONITORING SYSTEMS
POSITIONING
REACTOR VESSELS
IN-SERVICE INSPECTION
MONITORING
NOZZLES
WELDED JOINTS
AIR FLOW
FASTENERS
FEEDWATER
FLANGES
IMAGE SCANNERS
RODS
ROTATION
SPACE DEPENDENCE
CONTAINERS
FLUID FLOW
GAS FLOW
HYDROGEN COMPOUNDS
INSPECTION
JOINTS
MOTION
OXYGEN COMPOUNDS
WATER
220400* - Nuclear Reactor Technology- Control Systems
220200 - Nuclear Reactor Technology- Components & Accessories