GB/T 40101-2021Ultrasonic testing method for stainless steel bars, plates and forgings of PWR nuclear fuel assembly and associated assembly (English PDF)

Foreword

This standard was drafted in accordance with the rules given in GB/T 1.1-2009.

1 Scope

This standard specifies the general requirements and instruments for ultrasonic testing of stainless steel rods, plates, and forgings used in pressurized water reactor nuclear fuel assemblies and related components. And probe, comparison test block, test procedure, result judgment and record and test report.

This standard is applicable to the ultrasonic testing of stainless steel rods, plates, and forgings for PWR nuclear fuel assemblies and related components. Stainless steel rod detection straight The diameter is 9mm~70mm, the detection thickness of stainless steel plate is 9mm~50mm, and the detection thickness of stainless steel forgings is less than or equal to 400mm. its Metal rods, plates, and forgings of other specifications or materials can also be used as reference.

2 Normative references

The following documents are indispensable for the application of this document. For dated reference documents, only the dated version applies to this document. For undated reference documents, the latest version (including all amendments) is applicable to this document.

JB/T 10061 A-type pulse reflection ultrasonic flaw detector general technical conditions

3 General requirements

3.1 The personnel engaged in ultrasonic testing shall obtain the qualification certificate of ultrasonic testing level I or above issued by the certification body.

The personnel of the acoustic test report shall obtain the ultrasonic test level II or above qualification certificate issued by the certification body.

3.2 The ambient temperature should be between 10°C and 35°C, and the relative humidity should be <=80%. Nothing near the ultrasonic testing site should affect the normality of ultrasonic testing equipment Work electromagnetic field, vibration, corrosive gas and other interference.

3.3 The surface roughness of the test object should be <=3.2µm, and there should be no foreign substances on the test surface, such as oxide scale, metal scraps, dirt, paint, etc.

3.4 Coupling agent (including additives) should not damage the surface condition of the tested material, the total content of halogens (chlorine and fluorine) should be <=250µg/g, and the sulfur content Should be <=250µg/g.

3.5 The ultrasonic testing of stainless steel rods adopts the water immersion method, and the ultrasonic testing of stainless steel plates and forgings adopts the contact method.

3.6 Clean tap water can be used as a coupling agent in the water immersion method, and an anti-rust agent or wetting agent can be added. There should be no influence on the ultrasonic detection in the water. Factors such as bubbles.

3.7 The contact method can use engine oil, glycerin or water as a coupling agent. The viscosity and surface wettability of the coupling agent should ensure that the ultrasonic energy is transmitted to the workpiece.

4 Instruments and probes

4.1 Pulse reflection ultrasonic flaw detector with A-type display should be used, and the instrument should meet the requirements of JB/T 10061.

4.2 Use straight probes or focus probes to detect stainless steel rods with a probe frequency of 5MHz~25MHz.

4.3 Single crystal or double crystal straight probes are used to detect stainless steel plates, and the probe frequency is 2MHz~5MHz.

4.4 The single crystal straight probe is used to detect stainless steel forgings, and the probe frequency is 1MHz~5MHz. When testing the combination of stainless steel T-shaped forgings When the angle is R angle, a single crystal oblique probe can be used, and the refraction angle of the oblique probe should be 45°(K=1).