501 / 536
reactors of Saint-Laurent A. The static containment of
this waste is ensured by the concrete structures of the
silo bunkers which are sealed by a steel liner. In 2010,
EDF installed a geotechnical containment around the
silos, reinforcing control of the risk of dissemination of
radioactive substances, which is the main risk presented
by the installation.
Operation is limited to surveillance and maintenance
measures (inspections and radiological monitoring of
the silos, checking there is no water ingress, checking
the relative humidity, the dose rates in the vicinity of
the silos, the activity of the water table, monitoring the
condition of civil engineering structures).
In 2015, ASN completed its examination of the
commitments made by EDF following the periodic
safety review of the installation which ended in 2014.
ASN considers that nothing calls operation of the BNI
into question provided that the dates of waste removal
from these silos are respected, but it is waiting for
additional studies from EDF which must be transmitted
as part of the periodic safety review conclusions file. The
additional studies primarily concern the seismic risk
and surveillance of the condition of the civil engineering
structures.
Examination of the resolutions governing the Saint-
Laurent-des-Eaux site discharges also ended in early
2015. ASN more specifically asked EDF to conduct
a study to evaluate the possible presence of diffuse
discharges from the silos.
ICEDA construction site, August 2015.
501
CHAPTER 16:
RADIOACTIVE WASTE AND CONTAMINATED SITES AND SOILS
ASN report on the state of nuclear safety and radiation protection in France in 2015