周五，官方将本次事件的警报级别从四级提高到五级，而核事故的国际标准仅有七级。
On Friday officials raised the alert level at the plant from four to five on a seven-point international scale of atomic incidents.
四级医疗事故：造成患者明显人身损害的其他后果的。
Grade IV medical accident: causing other tangible personal injuries to a patient.
目的：探讨在核舰船核事故应急体系中把海上应急状态划分为第四级（类）的可行性。
Results: A profile was made pertaining to maritime emergency status in case of nuclear accidents .
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