FUEL SURVEILLANCE RESULTS FROM THE FIRST TiO_2 APPLICATION IN A BWR PLANT

摘要

TiO_2 injection technology has been developed as an intergranular stress corrosion cracking (IGSCC) mitigation countermeasure for BWR plants and was successfully applied during the course of plant shutdown at the Unit-1 of Fukushima-Daini Nuclear Power Station of Tokyo Electric Power Company in 2010. The TiO_2 chemical was injected to the primary coolant system in order to deposit TiO_2 onto the structural materials to prevent IGSCC. The TiO-2 deposition amount onto the structural materials and the fuel rods were measured during the following maintenance outage period. The oxide thickness of the fuel cladding with TiO_2 pre-coated one cycle before the application was measured and turned out to be within an allowable range.