Fukushima Radiation Release Exceeds NRC Design-Basis Limit

, senior scientist | March 15, 2011, 0:22 am EST
Bookmark and Share

U.S. Nuclear Regulatory Commission (NRC) regulations require nuclear license applicants to show that their plants can withstand a series of design-basis accidents without releasing radiation that would exceed a given level. In particular, the whole-body dose for someone standing at the site boundary for the worst two hours of the accident cannot exceed 25 rem, or 250 milli-Sieverts (mSv).

The dose rate for such a design-basis accident would be 125 mSv per hour.

In comparison, the dose rate near reactor Unit 3 at Fukushima Dai-Ichi has reportedly reached 400 mSv per hour. The Fukushima accident is therefore now a beyond-design-basis accident, at least in NRC terms.

Posted in: Japan, Nuclear Power Safety Tags: , ,

Support from UCS members make work like this possible. Will you join us? Help UCS advance independent science for a healthy environment and a safer world.

Show Comments

Comment Policy

UCS welcomes comments that foster civil conversation and debate. To help maintain a healthy, respectful discussion, please focus comments on the issues, topics, and facts at hand, and refrain from personal attacks. Posts that are commercial, obscene, rude or disruptive will be removed.

Please note that comments are open for two weeks following each blog post. When commenting, you must use your real name. Valid email addresses are required. (UCS respects your privacy; we will not display, lend, or sell your email address for any reason.)