Report - Agence canadienne d'évaluation environnementale
Report - Agence canadienne d'évaluation environnementale
Report - Agence canadienne d'évaluation environnementale
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Assessing the risks related to the project<br />
Table 9 Sensitive elements identified in the Lévis-Beaumont sector within<br />
the 5-kW/m2 isocontour for accident scenarios regarding berthed<br />
LNG tankers<br />
Accident scenarios according to LNG tanker Number of residences within the<br />
type berthed<br />
5-kW/m 2 Reference LNG tanker<br />
isocontour<br />
1,500-mm breach (steady-state pool) 13<br />
750-mm breach (initial spill pool) 26<br />
750-mm breach (steady-state pool)<br />
Qflex type LNG tanker<br />
None<br />
1,500-mm breach (steady-state pool) 19<br />
750 mm-breach (initial spill pool) 28<br />
750 mm-breach (steady-state pool) None<br />
Source: adapted from PR5.3.2, p. 3.<br />
The proponent also carried out an inventory of sensitive elements which could be<br />
found within the 1.6-kW/m 2 thermal radiation limit. The analysis was based on<br />
250-mm and 750-mm breaches and steady-state spill pool conditions. The results<br />
indicate that up to twelve permanent residences would be included within this<br />
isocontour for the accident scenario using a 750-mm breach (DQ99.1, p. 3). While it<br />
was satisfied with this inventory, the Panel also believes it relevant that a<br />
complementary analysis of sensitive elements which could be found within the<br />
3-kW/m 2 thermal radiation limit, using a 1,500-mm breach, be carried out by the<br />
proponent so that this type of information (public assembly areas, schools, etc.) is<br />
made available when planning emergency measures.<br />
Several participants expressed concern over the proximity of the Sainte-Famille<br />
School in Lévis to the project’s facilities. The school would be located approximately<br />
1 km from the jetty and 2 km from the tanks. The Panel notes that the school would<br />
be located outside of the 5-kW/m 2 thermal radiation limit of the impact area, but would<br />
lie within the 1.6-kW/m 2 limit (at 1,330 m for the Qflex) in the event of an intentional<br />
act. The school would also be inside the lower flammability limit in terms of gas cloud<br />
propagation for scenarios using 750-mm breaches (at 1,100 m). Canadian and U.S.<br />
standards require a minimal distance of 310 m between educational institutions and<br />
the centre of LNG tanks. The distance between the closest tank centre and the school<br />
is approximately 2 km, which is close to seven times the minimal distance required by<br />
applicable standards.<br />
148 Rabaska Project – Implementation of an LNG Terminal and Related Infrastructure
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