1.1 Factory tests
The factory test is carried out on the valve. The valve is installed vertically in the nuclear power plant. When the valve is sealed after the linkage test, the whole valve is lying horizontally. The test conditions are more stringent when the valve is installed horizontally, which can cover the requirements of the original machine running vertically.
1.2 Qualification tests
(1) Tests for the cold state
Purpose of the test: to verify the functional performance of the valve in the cold state
Test medium: purified water
(2) Tests for the service life
Purpose of the test: to perform cyclic operation at 406.8kPa at normal temperature, and check whether the function of the valve can be maintained after it is opened and closed for 660 times.
Test medium: purified water
(3) Dynamic characteristic tests and seismic static load tests
Purpose of the test: to determine the natural frequency of the test valve. Verify integrity and operability of valves under seismic loads
Test medium: purified water
Matters needing attention: During the test, there is no floating support, and there is a simple support.
The factory test is carried out on the valve. The valve is installed vertically in the nuclear power plant. When the valve is sealed after the linkage test, the whole valve is lying horizontally. The test conditions are more stringent when the valve is installed horizontally, which can cover the requirements of the original machine running vertically.
1.2 Qualification tests
(1) Tests for the cold state
Purpose of the test: to verify the functional performance of the valve in the cold state
Test medium: purified water
(2) Tests for the service life
Purpose of the test: to perform cyclic operation at 406.8kPa at normal temperature, and check whether the function of the valve can be maintained after it is opened and closed for 660 times.
Test medium: purified water
(3) Dynamic characteristic tests and seismic static load tests
Purpose of the test: to determine the natural frequency of the test valve. Verify integrity and operability of valves under seismic loads
Test medium: purified water
Matters needing attention: During the test, there is no floating support, and there is a simple support.
Conclusion
Through the research on the gate valve of the fuel transportation channel, the following tasks have been accomplished.
(1) Research on design and manufacturing of fuel transportation channel gate valves
According to the requirements of CAP1400 nuclear power unit for the fuel transportation channel gate valve and considering the environment area where the gate valve is located, the overall structure design and material selection of the fuel transportation channel gate valve have been completed; the design of the anti-seismic class I remote transmission mechanism has been done. The design and manufacture of key parts such as remote transmission mechanism support and interfaces. The manufacturing equipment and manufacturing process of key parts of the gate valve for fuel transportation channels have been determined.
(2) Research on test verification and identification technology of fuel transportation channel gate valves
Determine the test methods and procedures for the gate valve of the fuel transportation channel; determine the identification items and identification methods, the cycle life and anti-seismic tests and procedures for class I.
The results of the research and development of the fuel transportation channel gate valve can be directly used in the CAP1400 fuel transportation channel gate valve, and can also be used in the follow-up domestic CAP1000 fuel transportation channel gate valve for nuclear power units. Through the research on gate valves for fuel transportation channels, the core technology of nuclear-grade large-diameter ultra-long-distance gate valves has been mastered, and the ability to independently design, manufacture and equipment appraisal of nuclear-level large-diameter ultra-long-distance gate valves has been formed.
(1) Research on design and manufacturing of fuel transportation channel gate valves
According to the requirements of CAP1400 nuclear power unit for the fuel transportation channel gate valve and considering the environment area where the gate valve is located, the overall structure design and material selection of the fuel transportation channel gate valve have been completed; the design of the anti-seismic class I remote transmission mechanism has been done. The design and manufacture of key parts such as remote transmission mechanism support and interfaces. The manufacturing equipment and manufacturing process of key parts of the gate valve for fuel transportation channels have been determined.
(2) Research on test verification and identification technology of fuel transportation channel gate valves
Determine the test methods and procedures for the gate valve of the fuel transportation channel; determine the identification items and identification methods, the cycle life and anti-seismic tests and procedures for class I.
The results of the research and development of the fuel transportation channel gate valve can be directly used in the CAP1400 fuel transportation channel gate valve, and can also be used in the follow-up domestic CAP1000 fuel transportation channel gate valve for nuclear power units. Through the research on gate valves for fuel transportation channels, the core technology of nuclear-grade large-diameter ultra-long-distance gate valves has been mastered, and the ability to independently design, manufacture and equipment appraisal of nuclear-level large-diameter ultra-long-distance gate valves has been formed.
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