Corrosion Suppression Technology for the Primary Containment Vessel

Abstract

The addition of corrosion inhibitor was considered as one of corrosion countermeasures for the primary containment vessels of Fukushima Daiichi nuclear power station. For various candidate corrosion inhibitors, immersion corrosion test, inhibitor interim addition test, and evaluation of localized corrosion resistance by electrochemical measurements were carried out. Based on the results of these tests, sodium pentaborate, sodium tungstate and two types of phosphate-based corrosion inhibitors were selected. Furthermore, the management procedure was established for the selected inhibitors.