24-48 LEAD BRICKS FOR RC3B PROJECT

The high flux reactor of the Institute Max von Laue-Paul Langevin (ILL) produces neutrons for scientific research. They are guided through coated glass tubes called neutron guides from the reactor to the experiments. A neutron guide is made of glass and propagates the neutrons by reflection from its walls. Around the guides, a radiological protection has to be mounted because each reflection of a neutron creates gamma radiation; the thickness and the material depend on the energies of the produced gamma rays. In the frame of the seismic reinforcement of the ILL high flux reactor, the ILL has agreed to redo the radiological shielding around the guides close to the reactor wall to avoid any possible degradations of this wall in case of seismic activity. The present contract is about the fabrication and the delivery of lead bricks for the installation of a radiological shielding. The shielding is build out of standard bricks that have been designed by the French CEA specifically to be easy to pile up manually and to create leak free walls and shielding. All bricks will be produced out of lead with a 3-4% part of Antimony to reinforce the stability of the bricks. The bricks are stabilized by metal frames that are not part of this tender. The tolerances of the lead bricks must allow the assembly of the lead wall.   The chosen manufacturer is asked to tender the following deliverables: • Raw material supply • Manufacturing of the lead bricks • Providing of all necessary reference documents (material certificates) • Tooling if necessary • Insurance • Packing, transport and delivery to the ILL (Boxes or wooden pallets can be used