Solid Radioactive Waste Strategy Report.pdf - UK EPR

EPR UK
N° NESH-G/2008/en/0123
REV. A PAGE 109 / 257
8.1.6.2 Activated ILW
Metallic and concrete wastes from the dismantling of the activated components near the reactor
core are solid wastes on the basis of the guidance given in NDA report N/104. Assuming that
these wastes are transported from the place of interim storage to the phased geological
disposal facility in year 100 and considering their radiological characterisation at this date the
waste packaging scenario is as follows:
· The shielded 4 metre boxes were developed for packaging wastes arising from the
dismantling of nuclear facilities. This freight container type package incorporates
concrete liner shielding that can have various thicknesses adapted to the activity level of
the wastes. Based on the maximum gross mass of 64t for such a package, with the
estimated activation of the components and the requirements in terms of dose rate at
contact (2mSv/h) and at 1 metre (0,1mSv/h) from this transport container, this kind of
container is not suitable for all of the ILW produced during the dismantling of an EPR.
The shielding required for the containment of the core shells of the reactor vessel is of
the order of 100mm thick. The other metallic ILW resulting from the dismantling of the
reactor (Neutron shield, internals) are not compatible with this kind of package. For
concrete waste use of 4 metre boxes without additional shielding is possible. The
characteristics of this conditioned waste are given in Table 31.
FIGURE 29: 4M 3 BOX
· The 3 cubic metre boxes potentially incorporating additional shielding will be used for
ILW (Neutron shield and most of the reactor vessel internals) that is not suitable for
packaging in 4m boxes. In addition, this packaged waste will required the use of a
transport container (of the type Standard Waste Package Container mentioned in the
report N/104) providing an additional shielding of 285mm of steel. The characteristics of
this conditioned waste are given in Table 32.