Recently, preventive maintenance tasks for welding of safe-end nozzles of reactor vessels and steam generators of PWRs in Japan had been carried out sequentially. Before the maintenance tasks, inspection services were carried out and several crack indications were found by eddy current testing (ECT). These indications were found in the welding which made b y 600 series nickel base alloy and evaluated as stress corrosion cracks which were oriented to the axial direction of the nozzle. Then investigations to...
英字タイトル:
Development of the advanced phased array UT technique for accurate sizing of cracks in the nozzlewelding

Corroded pore was found at stainless pipe for liquid waste solution fro m the analytical laboratory. In order to find out the cause of corrosio , analytical samples were prepared cutting from the pipe. Reagents con ined chloride, which had been used analytical laboratory more than te years before the date, were found to be the trigger of the localized c rosion. We checked up all the pipes, which have been wasted including chloride solutions, by phased array instrument. We report the investig ion of cause o...
英字タイトル:
Investigation into corrosion cause of the reprocessing facilities analysis waste fluid plumbing.

Corroded pore was found at stainless pipe for liquid waste solution from the analytical laboratory. Part of the pipe was cut for preparing samples to investigate the cause of the corrosion. The same size of stainless pipe was welded to recover it, under the strict radiation control. The restoration work was done inside of the vinyl house, as it is called “greenhouse”, which was the small room completely separated with outside by vinyl sheet. All the works, cutting, decontamination, digging groove and w...
英字タイトル:
Restoration of the corrosion department of the reprocessing facilities analysis waste fluid plumbing.