Basically, gauge pressure(atmospheric pressure) is based on the pressure of the atmosphere where the sensor is placed as zero(reference), and absolute pressure is measured from absolute zero, the pressure in a vacuum(approx. 10 Pa or below).
Note 1: TEPCO released only the'absolute pressure' data, which includes the atmospheric pressure component, for the containment vessel(drywell and[pressure] suppression chamber) pressure, but since the problem from the viewpoint of structural strength is the'gauge pressure,' given by subtracting the atmospheric pressure component from the absolute pressure, this figure uses gauge pressure..
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