METHOD AND DEVICE FOR LOCALLY DECREASING ELECTROCHEMICAL POTENTIAL IN VICINITY OF METAL PART TO BE PROTECTED

摘要

PROBLEM TO BE SOLVED: To suppress the electrochemical potential in the vicinity of a high sensitivity component in boiling water reactor. SOLUTION: The invention is based on the idea that electrons are fed directly and locally to a sensitized region of a metal in order to prevent intergranular stress corrosion crack. The electron supply source is aβradioactive substance 26 contained in a housing 8 fixed to a metal 2. The electron supply source is connected electrically with a sensitized area 6 of a metal. A flow of electrons thus produced is strong enough to compensate for the electrodes being captured from the metal by an electron acceptant fluid touching the metal.