While re-examining the (fracture zone) soft fault beneath the Unit 2 reactor at the Tsuruga nuclear power plant in Fukui Prefecture, Japan Atomic Power Company workers discovered a hole in a pipe buried 18 feet underground, used for drawing seawater through the intake for cooling the condenser. Both reactors at the Tsuruga site were shut down for regular checks, and no restart plans have been announced.
According to the utility, the hole in the pipe is a little over 3 inches wide and was discovered on Sunday. The piping is made of carbon steel, about 13 feet in diameter, and is less than one inch thick. Workers are thought to have hit the piping with the tip of the excavator.
In April of this year the Nuclear and Industrial Safety Agency admitted more details about a before unreported fault (without a name) that runs right beneath Unit 2 reactor, reversing an earlier assessment and acknowledging that the fault was able to slip and cause damage to the reactor, and could be induced by an earthquake caused by the Urazoko fault.
Source: The Japan Times
Source: 47 News Japan
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