Specific tasks have been defined under the EUROfusion Work Package on Plasma Facing Components (WP PFC) for which the usage of linear facilities able to handle beryllium, such as PISCES-B, is necessary. For the 2017-2018 EU-US collaboration in the PISCES-B Facility three tasks were specified. We will study Be erosion as a function of D plasma flux, D retention in damaged Be and D retention saturation at high fluences in W:Be mixed layers.