Report - Agence canadienne d'évaluation environnementale

Assessing the risks related to the project
Table 10 Consequences of accident scenarios considered for on-land
environments
Accident scenario description 5-kW/m 2 thermal
radiation isocontour
LNG leak occurring in the biggest ESD
segment in the impoundment basin of the
processing area
LNG leak from tank lines towards the
impoundment basin of the tanks area
LNG leak from an unloading line towards
the impoundment basin of the shoreline
facilities or the impoundment basin of the
jetty head
Leak from an LNG tank roof (fire across
the entire tank diameter, i.e. 90 m)
Sources: adapted from PR5.3.2, p. 7; PR3.3.2, F-1, p. 76 to 81.
The individual risk associated with land facilities
Distance to the
flammability limit
60 m 35 m
60 m 35 m
60 m 35 m
320 m 600 m
Individual risks were assessed according to the consequence, the frequency of
occurrence of the accident considered, and the probability that someone could suffer
serious injuries. These risks were expressed in the form of isocontours which included
all the accident scenarios retained for the LNG facilities, including a berthed LNG
tanker, but excluding the pipeline, as it was analyzed separately.
The areas where the risk is deemed unacceptable were located within the 10 -
4 isocontour, which corresponds to an event occurrence frequency of once every
10,000 years. According to analysis, there are no homes or any areas inhabited at all
times within this limit. The analysis also established that, with the exception of three
residences, the buildings would be located in an area where the risk of death is lower
than once every million years (