Thermal efficiency diagnosing system for nuclear power plant, thermal efficiency diagnosing program for nuclear power plant, and thermal efficiency diagnosing method for nuclear power plant

Abstract

A nuclear power plant thermal efficiency diagnostic system 10 comprises: a feed-and-condensate-water-flow-rate-setting-means 13 for setting a flow rate of feedwater tentatively; a heat-exchange-on-heater-calculating-means 14 for calculating heat exchange quantities of the feedwater and the condensate water on a heater; a HP turbine power calculating means 15 for acquiring a calculated power value of a high pressure turbine; a HP turbine power correcting means 16 for making the calculated power value of the high pressure turbine corrected; a HP turbine internal efficiency calculating means 17 for calculating an internal efficiency of the high pressure turbine; a steam condition on LP turbine inlet calculating means 18 for setting a condition of a steam on an inlet of a low pressure turbine; a LP turbine power calculating means 21 for acquiring a calculated power value of the low pressure turbine; a LP turbine power correcting means 22 for making the calculated power value of the low pressure turbine corrected; a LP turbine internal efficiency calculating means 23 for calculating an internal efficiency of the low pressure turbine; and a performance-deteriorating-element-specifying-means 25 for specifying an element which causes on deterioration of performance of the nuclear power plant.

Description

TECHNICAL FIELD [0001] The present invention relates to a nuclear power plant thermal efficiency diagnostic system, a nuclear power plant thermal efficiency diagnostic program and a nuclear power plant thermal efficiency diagnostic method, and more particularly, to a nuclear power plant thermal efficiency diagnostic system, a nuclear power plant thermal efficiency diagnostic program and a nuclear power plant thermal efficiency diagnostic method for making a diagnosis on a performance of each machinery in order to specify machinery which causes deterioration of a power output from a nuclear power plant. BACKGROUND ART [0002] How to improve thermal efficiency in a power-generating plant such as a nuclear power plant or a thermal power plant is increasingly importance from the viewpoint of saving fuel and reducing costs of power generation. [0003] However, a general power-generating plant includes plural elements such as HP (high-pressure) turbine and LP (low-pressure) turbines. Thus, ...

AI Technical Summary

Benefits of technology

The present invention provides a system, method, and program for diagnosing the thermal efficiency of a nuclear power plant. The system can set the flow rate of feedwater and condensate water, calculate the heat exchange quantities of the feedwater and condensate water on a heater, and acquire the power value of the high pressure turbine. It can also set the condition of steam on the inlet of the low pressure turbine, calculate the power value of the low pressure turbine, and correct the reference expansion line of the low pressure turbine to recalculate its power. The system can thus identify specific elements that cause performance deterioration of the nuclear power plant.

Problems solved by technology

Thus, if the total thermal efficiency of the power-generating plant decreases, it is difficult to accurately calculate performance of the individual elements.

It is accordingly difficult to specify and determine an element that causes a drop in the thermal efficiency in the power-generating plant.

However, steam used as a power source of the HP turbine and the LP turbine of the nuclear power plant is in a wet state unlike steam used in the thermal power plant or other such plants.

Hence, the dryness of steam is different between the outlets and inlets of the HP turbine and the LP turbine, so only measuring a temperature and pressure of the steam is insufficient for precisely calculating enthalpy of the steam.

As a result, it is difficult to accurately calculate internal efficiencies of the HP turbine and the LP turbine of the nuclear power plant to grasp a turbine performance.

Therefore, it is difficult to apply the conventional thermal efficiency diagnostic apparatus 1 for a thermal power plant to the nuclear power plant whose system or element is different from the thermal power plant.

As a result, a technique of diagnosing thermal efficiency of each element of the nuclear power plant to thereby specify which element causes a drop in an electric power has not been yet proposed.

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