METHOD FOR REPAIRING GUIDE RAILS OF AN ASSEMBLY RADIALLY MAINTAINING A SUPPORT PLATE OF A PRESSURIZED WATER NUCLEAR REACTOR CORE

摘要

#CMT# #/CMT# The repair procedure consists of cutting away at least one of the two side branches (27b) of the slideway guide (27) for a radial slider key (15) on a PWR support plate (5) after measuring the distance between the faces of the two branches. The cutting operation is performed by electro-erosion across the corner of the U-shaped guide, and a replacement side branch is machined to the required dimensions and fixed in place by screws inserted through holes drilled from the outside of the guide holder (26). #CMT#USE : #/CMT# Repairing worn slideway guides to reduce clearances that cause vibration. #CMT#ADVANTAGE : #/CMT# The repair procedure uses methods and equipment that are compatible with underwater assembly in an irradiated medium. #CMT#DESCRIPTION OF DRAWINGS : #/CMT# The drawing shows a cross-section of the slideway guide and support plate key assembly viewed from above. 5 : Reactor core support plate 15 : Key 26 : Guide holder 27 : Slideway guide 27b : Side branch.