Short description of the work
The corrosion and contamination of stainless steels in conditions similar to those found in a reprocessing plant has been studied. Different surface finishes of stainless steel were used in the project; the as-received material, ground and polished, and electrolytically etched. The 304L steel was held in vials of nitric acid (4 or 12 M) containing a transuranic contaminant. These were 1 g/L solutions of americium and plutonium and 0.5 g/L of neptunium. The solutions were held at 50°C for a month.
Subsequently, autoradiography was undertaken in order to determine the location and extent of any radionuclide contamination on the stainless steel coupon. All samples showed transuranic uptake with dependence on acid molarity and the surface morphology. ICP-MS of the solutions has been conducted in order to accurately describe the level of uptake. XPS and SEM/EDX were also performed on the steel samples to get a clearer understanding of the contaminant speciation and corrosion behaviour of the steel. It was seen that the former was unsuitable due to insufficient contaminant concentration on the immediate steel surface. However, the latter has elucidated the extent of pitting and intergranular corrosion of the material.

Main visitor contact data
Name: Mr Tim Kerry
Organisation: University of Manchester

JRP Identification
JRP nr: TALI-C06-16
JRP title: Understanding transuranic binding mechanisms and speciation on stainless steel in order to aid decontamination processes
JRP scope: Scope 1: Actinide separation chemistry

Visited Associated Pooled Facility
Visited APF during the stay: KIT-INE - Laboratories
Name of the APF Contact Person: Dr. Andreas Geist

Other APF and organisation involved in the JRP
Other organisations involved: University of Manchester (Clint Sharrad)
Other APF involved in the project:

Description of the work done at the associated pooled facility
Start date of the stay: 10/12/2015
End date of the stay: 12/11/2015
Quantity of access: 45
Access Unit: Days