公开(公告)号：US10453576B2

公开(公告)日：2019-10-22

申请号：US14812051

申请日：2015-07-29

Applicant: WESTINGHOUSE ELECTRIC COMPANY LLC

Inventor： Rachel L. Devito ,  Jason P. Mazzoccoli ,  Edward J. Silva ,  Deborah J. Buckley ,  Richard J. Jacko ,  William A. Byers

IPC: G21C17/022 ,  G21C21/00 ,  C23F11/18

Abstract: The present invention relates to a pre-core hot functional testing (HFT) preconditioning process, which includes the introduction of chemical additives, e.g., zinc, into coolant water that circulates through the primary system of a new nuclear power plant, at various temperatures. The chemical additives contact the primary system surfaces, which results in the formation of a protective zinc-containing oxide film on the fresh surfaces to control corrosion release and deposition during subsequent normal operation of the nuclear power plant. The method includes a series of three chemistry phases to optimize the passivation process: 1) an alkaline-reducing phase, 2) an acid-reducing phase and 3) an acid-oxidizing phase.