JRP CALL information
Supported By

European Commission

Short description of the work
This JRP's aim is a fundamental study of the interaction of Am with stainless steels encountered in repository and waste separations, treatment and storage. The specific objectives are:
To determine whether and in what form Am incorporates into passivating layers on Cr/Ni rich low carbon steels in acid and neutral media (relevant to waste separation processes and repository).
To determine whether and in what form Am incorporates into corrosion products formed in carbon steels under alkaline conditions (of relevance to waste storage) and on low carbon steels under acid conditions (of relevance to HAL evaporators)
To determine whether Am affects steel corrosion, either as a corrosion accelerator or by changing the corrosion product (as per U uptake in iron oxyhydroxides)
Various cyclic voltammetries and open circuit potential measurements were carried out using the glassy carbon and various sized gold microelectrdoes.
The following peak assignments in 1 M HNO3 with glassy carbon were made:
Oxidation wave observed during forward sweep assigned to conversion of Am(III) to Am(VI)
Reductive peak at 1.2 V has been assigned to carbon electrochemistry
Am reduction peak observed at ~ 0.7 V
Am reduction peak observed at ~ 0.7 V - corresponding to Am(V) to Am(IV) reduction. Randle-Sevcik analysis reveals this to be the reduction of a solution phase species. It also reveals that this peak corresponds to the reduction of Am(V) derived from the stoichiometric oxidation of Am(III).

Main visitor contact data
Name: Nadya Rauff-Nisthar
Organisation: Lancaster University

JRP Identification
JRP nr: TALI-C01-19
JRP title: A fundamental study of the intercations of Am with steel surfaces
JRP scope: Scope 3: Actinide materials

Visited Associated Pooled Facility
Visited APF during the stay: JRC-ITU - Labs & Hot-cells
Name of the APF Contact Person: Dr Detlef Wegen

Other APF and organisation involved in the JRP
Other organisations involved: Lancaster University
Other APF involved in the project:

Description of the work done at the associated pooled facility
Start date of the stay: 1/19/2015
End date of the stay: 2/6/2015
Quantity of access: 15
Access Unit: Days