According to a Kyodo News International report appearing on today’s GlobalPost website:
Tokyo Electric Power Co. said Monday it has seen a rise in the level of radioactive tritium in seawater within the port at the crippled Fukushima Daiichi nuclear power plant.
A sample collected Friday contained around 1,100 becquerels of tritium per liter, the highest level detected in seawater since the nuclear crisis at the plant commenced in March 2011. (Emphasis mine.)
There are also indications that the amount of radiation may be increasing:
The level was more than double that of a sample taken on June 10 in the same area.
Japanese regulators think that the increase may be the result of an active leak:
An official of the Nuclear Regulation Authority said groundwater containing radioactive substances may be seeping into the port from the plant site….