While the city of Portsmouth, with four suburbs, is farthest away and in the G-level ERPA, it represents the single largest populated and congested planning area.
The report also analyzed evacuation time estimates of “shadow regions,” which extend beyond the 10-mile radius by another 5 miles.
Numerous evacuation scenarios are explored: weather (good, rain or snow), seasons (winter or summer), day of week (midweek or weekend) and time of day. The report also discusses evacuation scenarios that include special events, such as a Fourth of July fireworks show at Hampton Beach or the shutdown of a highway lane on a major evacuation route.
“General population (evacuation time estimates) were computed for 266 unique cases,” according to the report, “(generated from) a combination of 19 unique evacuation regions and 14 evacuation scenarios.”
Calling it a “data-rich” report, Sheehan said it includes scores of tables charting the estimated evacuation time in every emergency response planning area — school, hospital and populated areas — during every scenario on the basis of moving 90 percent and 100 percent of the populace.
Sheehan said the complete Evacuation Time Estimate Update for Seabrook Station is available online within the NRC’s electronic documents system at http://adams.nrc.gov/wba/.