Nuclear power plant having a water chemistry control system for a primary cooling system thereof and an operation method thereof
First Claim
1. A primary cooling system of a boiling water nuclear reactor, characterized by a water chemistry control system comprising:
- a plurality of water chemistry sensors provided in flow passages of water or steam of the primary cooling system at different portions, said primary cooling system including a main steam line, a feed water line and a condensate line;
means for estimating a water chemistry at least one specific portion of said primary cooling system, using information from at least some of said plurality of water chemistry sensors, said means including an arithmetic unit and a memory device; and
at least one injection device for injecting an agent for improvement of the water to mitigate corrosion damage of said primary cooling system.
1 Assignment
0 Petitions
Accused Products
Abstract
A water chemistry factor which is specific to a specific portion of a primary cooling system and universal is decided to be a standard target. The concentration of an agent for mitigating corrosion damage of structural material of the primary cooling system is controlled so that the target will be in a desirable range. All sensor groups provided in the primary cooling system are separated into sensor groups in different lines, of which a specific sensor group are connected to an arithmetic unit and a data base and are for always monitoring a plant process. For example, concentration distribution agreed with measured value oxidation component in the reactor water at the measurement points is selected from the data base, and it is used to estimate the standard target.
-
Citations
23 Claims
-
1. A primary cooling system of a boiling water nuclear reactor, characterized by a water chemistry control system comprising:
-
a plurality of water chemistry sensors provided in flow passages of water or steam of the primary cooling system at different portions, said primary cooling system including a main steam line, a feed water line and a condensate line; means for estimating a water chemistry at least one specific portion of said primary cooling system, using information from at least some of said plurality of water chemistry sensors, said means including an arithmetic unit and a memory device; and at least one injection device for injecting an agent for improvement of the water to mitigate corrosion damage of said primary cooling system. - View Dependent Claims (8, 9, 10, 11, 12)
-
-
2. A primary cooling system of a boiling water nuclear reactor, characterized by comprising:
-
means for sensing a physical quantity of a specific factor of factors determining a water chemistry around at least one first specific portion of the primary cooling system; means for estimating the water chemistry at at least one second specific portion of the primary cooling system different from said first specific portion on basis of the measured value and data base stored in a memory device; and means for injecting an agent for mitigating corrosion damage of structural material of the primary cooling system into the primary cooling system so that a conjectural value obtained by said estimating means will be within a target range.
-
-
3. A primary cooling system of a boiling water nuclear reactor, having
means for storing in advance theoretical calculation results concerning the concentration of chemical components in water in the primary cooling system for each of various operational conditions in a memory device; - and
means for estimating, on the basis of the calculation results and measured values of some of the chemical components in the water or steam, a water chemistry at a portion of the primary cooling system different from measuring points. - View Dependent Claims (4, 5, 6, 7)
- and
-
13. A primary cooling system of a boiling water nuclear reactor, characterized by a water chemistry control system comprising:
-
a plurality of water chemistry sensors provided in flow passages of water or steam of the primary cooling system at different portions; means for detecting or estimating a water chemistry at least one specific portion of said primary cooling system; and at least one injection device for injecting an agent for improvement of the water chemistry to mitigate corrosion damage of said primary cooling system. - View Dependent Claims (14, 15, 16, 17, 18, 19, 20)
-
-
21. A water chemistry control method of a nuclear power plant, comprising the steps of:
-
measuring at least a physical quantity representative of water chemistry at a first portion of a primary cooling system of the nuclear power plant; estimating a value representative of water chemistry at a second portion of said primary cooling system different from said first portion on the basis of a measures value in said measuring step and data stored in a memory device obtain a estimated value concerning the water chemistry around said second portion; and controlling the water chemistry around said second portion according to said estimated value.
-
-
22. A water chemistry control method of a nuclear power plant, comprising the steps of:
-
monitoring, on the basis of water chemistry information and radiolysis production concentration distribution around structural material at various portions of the primary cooling system and on the basis of flow rate distribution, dose rate distribution at the various portions of the primary cooling system, electro-chemical potential of the structural material under water chemistry conditions of each the portion of the primary cooling system in the reactor; comparing the electro-chemical potential with a standard electro-chemical potential value set in advance; and controlling the water chemistry on the basis of the compared results.
-
-
23. A water chemistry control method of a nuclear power plant, comprising the steps of:
-
monitoring, on the basis of water chemistry information and radiolysis production concentration distribution around structural material at various portions of the primary cooling system and on the basis of flow rate distribution, dose rate distribution at the various portions of the primary cooling system, electro-chemical potential distribution and SCC sensibility distribution of the structural material under water chemistry conditions of each the portion of the primary cooling system in the reactor; comparing monitored values with a standard electro-chemical potential value and a standard SCC sensibility value set in advance; and controlling the water chemistry on the basis of the compared results.
-
Specification