Hitachi-ge Nuclear Energy, Ltd.

Kazuaki Kitou

Motoo Aoyama

Masao Chaki

Kouji Shiina

Masaya Ootsuka

Yasuhiro Takahashi

Minoru Okura

Seiji Nemoto

Masaya Ohtsuka

Masayuki Nagasawa

Kouji Shina

In a nuclear power plant, thermal power in a second operation cycle of a nuclear reactor is uprated from thermal power in a first operation cycle preceding the second operation cycle by at least one operation cycle. A proportion of steam extracted from a steam system and introduced to a feedwater heater, which is in particular extracted from an intermediate point and an outlet of a high pressure turbine, with respect to a flow rate of main steam, is reduced in the second operation cycle from that in the first operation cycle such that the temperature of feedwater discharged from the feedwater heater is lowered by 1&#xb0; C. to 40&#xb0; C. in the second operation cycle.

Operation method of nuclear power plant

A nuclear power plant and method of operation for augmenting a second reactor thermal power output in a second operation cycle to a level larger than a first reactor thermal power output in the previous operation cycle. The plant is equipped, for example, with a reactor; a steam loop comprising high and low pressure turbines; a condenser for condensing steam discharged therefrom the low pressure turbine; a feedwater heater for heating feedwater supplied from the condenser; and a feedwater loop for leading feedwater discharged from the feedwater heater to the reactor. The operation method includes decreasing a ratio of extraction steam which is led to the feedwater heater from a steam loop in the second operation cycle.

Nuclear power plant and operation method thereof

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Tokai, Japan

Kazuaki Kitou