CX-270343: Repair of the North Radiography Station (NRS) Gamma Shield

The North Radiography Gamma Station (NRS) at the Neutron Radiography Reactor (NRAD) is out of service (OOS). The gamma shield has failed to fully reposition and needs to be repaired. The proposed action would replace the gamma shield. The shield is located along the beam tube in a trench cut into the floor of the north side of the basement of the Hot Fuel Examination Facility (HFEF) in the Radiological Buffer Area (RBA). Removable shielding consisting of ferro-phosphorous ore mixed with probertite and placed in polyethelene bags, polyethylene slabs, paraffin, and lead bricks cover the trench. Accessing the gamma shield involves removing this shielding. The shielding will be put back in place following the proposed action. Degraded shielding bags found during the project will be replaced.