The Tokyo Electric Power Company in Japan plans to revise its criteria for determining if a damaged nuclear power plant is poised to start a dangerous, "critical" chain reaction of fission.
The revisions come in the wake of confusion over whether the damaged Fukushima Daiichi nuclear plant had gone critical, generating neutrons through the fission, or splitting, of uranium nuclei that would then go on to split more nuclei in a runaway process.
We obviously have a fluid situation on our hands. To read more, click here.