Report - Agence canadienne d'évaluation environnementale

Assessing the risks related to the project
Closer to home, the terminal of Canaport in New Brunswick uses a 595-m radius
around the LNG tanks. However, contrary to the current project which plans on using
full containment tanks, the tanks of that terminal are single wall. The terminals in
Freeport and Cameron in the United States have exclusion radiuses of 279 and
283 m respectively around their full containment tanks (DA12, p. S11-4).
Furthermore, the MDDEP was of the opinion that the proponent’s analysis of the
exclusion zones was acceptable and in compliance with the CSA-Z276 standard
(DQ61.1, p. 2). It also recalled that it could recommend, if required, additional security
measures beyond those planned by the proponent, should the project be completed.
♦ Finding — The Panel found that there are other facilities in the world of the same
nature as those of the project, whose exclusion zones are of the same magnitude as
those proposed in the project.
The accident scenarios used and their consequences
The proponent assessed the possible consequences from a collision between a ship
and an LNG tanker located at the jetty. He retained four main scenarios for his land
facilities. They included fires resulting from an LNG leak out of the largest ESD 1
segment (PR3.3.2, F-1, p. 47); from tank lines; from the unloading line; and from a
tank roof. The pipeline was the subject of a separate analysis
The consequences of a collision between a ship and a berthed LNG
tanker
To assess the consequences stemming from the most likely accident scenarios for a
collision between a ship and an LNG tanker at the jetty, the proponent used breaches
of 250 mm, 750 mm and of 1,500 mm. The distances to the 5-kW/m 2 thermal radiation
limit, as well as the dispersion distances, were the same as those provided in Table 7.
Table 9 shows the number of residences in the Lévis-Beaumont sector which could
possibly be included in the 5-kW/m 2 impact area, should these accident scenarios
ever occur.
1. ESD Segment: Emergency Shutdown System.
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