The inspection, inspection, certification, and testing methods of nuclear instruments (environmental tests) are mainly carried out in accordance with relevant national standards and test methods. The following is a detailed summary of these methods:

I. Inspection and Test Methods
Low-Temperature Test
According to GB/T 2423.1-2008 or relevant standards, the nuclear instrument is placed in a specified low-temperature environment to detect its performance changes under low-temperature conditions.
High-Temperature Test
According to GB/T 2423.2-2008 or relevant standards, the nuclear instrument is placed in a specified high-temperature environment to evaluate its stability and reliability under high-temperature conditions.
Constant Humidity Test
According to the relevant parts of the GB/T 2423 series of standards, the nuclear instrument is placed in a constant humid heat environment to detect its performance changes under humid heat conditions.
Vibration Test
Following GB/T 2424.26-2008 or relevant standards, the nuclear instrument is subjected to a vibration test to evaluate its stability and reliability under vibration conditions.
Impact test
According to relevant standards, impact tests are carried out on nuclear instruments to detect changes in their performance under impact conditions.
Packaging and transportation test
Including tests such as road transportation, package drop, and package quasi-dumping, to evaluate the safety and reliability of nuclear instruments during transportation.
Free drop test
Free drop test is carried out on nuclear instruments to detect their impact resistance under drop conditions.
Low-pressure test
According to GB/T 2423.21-2008 or relevant standards, nuclear instruments are placed in a low-pressure environment to evaluate their performance changes under low-pressure conditions.
High-pressure test
High pressure test is carried out on nuclear instruments to detect their stability and reliability under high-pressure conditions.
Temperature change test
Following GB/T 2423.22-2012 or relevant standards, temperature change tests are carried out on nuclear instruments to evaluate their performance changes under temperature change conditions.
Solar radiation test
Simulate solar radiation environment and carry out solar radiation tests on nuclear instruments to detect their performance changes under solar radiation conditions.
Water test
Including dripping, rainfall, flushing, and immersion tests to evaluate the waterproof performance and stability of nuclear instruments in a water environment.
Dust test
Follow GB/T 2423.37-2006 or relevant standards, and conduct dust tests on nuclear instruments to detect performance changes in the dust environment.
Mildew test
Simulate the mold growth environment and conduct mildew tests on nuclear instruments to evaluate their corrosion resistance in the mold environment.
Salt spray test
Simulate the salt spray environment and conduct salt spray tests on nuclear instruments to detect their corrosion resistance in the salt spray environment.
Nuclear radiation exposure test
Nuclear instruments are subjected to nuclear radiation exposure tests to evaluate their performance changes and stability in the nuclear radiation environment.
Light effect test
Simulate the lighting environment and conduct light effect tests on nuclear instruments to detect their performance changes under lighting conditions.
Electromagnetic test
Electromagnetic compatibility test on nuclear instruments to evaluate their stability and reliability in the electromagnetic environment.
2. Test process
Each environmental test usually includes the following operation process:
Pretreatment: Perform necessary pretreatment on the nuclear instrument before the test, such as cleaning, calibration, etc.
Initial test: Test the performance of the nuclear instrument before the test to record its initial state.
Conditional test: Place the nuclear instrument in the specified test environment and perform the specified test operation.
Intermediate test (when necessary): Perform necessary intermediate tests during the test to evaluate the performance changes of the nuclear instrument.
Final test: Test the performance of the nuclear instrument after the test to evaluate its stability and reliability under the test conditions.
3. Certification and testing
After completing the above tests, a comprehensive evaluation of the performance of the nuclear instrument is required. If the nuclear instrument meets the relevant standards and requirements, it can be certified. The certification process may include submitting a test report, accepting an audit, and on-site inspection. At the same time, other specific tests can be performed as needed to evaluate other performance or characteristics of the nuclear instrument.
In summary, the detection, inspection, certification, and test methods of nuclear instruments (environmental tests) are a complex and systematic process that needs to be carried out in accordance with relevant national standards and test methods. Through scientific testing and certification processes, the stability and reliability of nuclear instruments under various environmental conditions can be ensured, providing strong guarantees for the development and application of nuclear energy.