Hitachi, Ltd.

Hitachi-ge Nuclear Energy, Ltd.

Keita Okuyama

Kenji Noshita

Akira Sasahira

Shiro Takahashi

Akitaka Hidaka

Masami Kato

A plant with piping mounted on branch pipe,

Plant with piping mounted on branch pipe and boiling water reactor plant

A subterranean environment evaluating apparatus and method, which measure, e.g., the geologic distribution coefficient in a subterranean environments using, e.g., a pit formed by boring. The subterranean environment evaluating apparatus comprises a geologic evaluation sensor, a pump, an analyzer, a PC, a data transmitter, etc., and it is disposed in the pit formed underground by boring. The geologic evaluation sensor is disposed to form a thin layer channel defined by the surface of a rock bed. Groundwater mixed with a tracer is caused to flow through the sensor, and the analyzer measures a change of tracer concentration in the groundwater between before and after contact of the groundwater with the rock bed. The PC determines a breakthrough curve from the change of tracer concentration, thereby calculating the distribution coefficient (Kd) between the rock bed and the groundwater and the effective diffusion coefficient of the rock bed.

Apparatus and method for evaluating subterranean environments

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Hitachi, Japan

Keita Okuyama