Hitachi, Ltd.

Tokunori Mathusima

Takeshi Sato

Shozo Nakamura

Akira Uenishi

Kunio Tsuji

In moisture separator reheaters of a nuclear power plant, a control valve is mounted in a steam vent line of the plant to control the flow rate of vent steam in conformity with the load applied to the plant, to thereby avoid the occurrence of any instable flow phenomenon in the entire range of loads applied to the plant.

Method of and apparatus for controlling steam vent volume of moisture

A heat insulating structure having a heat-resistant tube disposed in a tubular cylindrical body and defining a passage for a high temperature gas, a heat insulating material disposed between the tube and the tubular cylindrical body and adapted to prevent the heat possessed by the gas from being transmitted to the tubular cylindrical body, and a spring adapted to bias the heat insulating material toward the inner surface of the tubular cylindrical body, so as to prevent the formation of a bypass passage for the gas including the gap between the tubular cylindrical body and the heat insulating material. The heat insulating material consists of a plurality of fibrous heat insulating materials mainly consisting of bulky fibrous materials and a plurality of shaped fibrous heat insulating materials. These fibrous heat insulating materials and the shaped fibrous heat insulating materials are arranged alternatingly and independently in the axial direction. In each of the bulky fibrous heat insulating material, disposed is a spring for biasing the shaped fibrous heat insulating material in the axial direction.

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Ibaraki, Japan

Tokunori Mathusima