稳压器波动管接管与底封头焊缝相控阵超声检测技术研究

Research on Phased Array Ultrasonic Inspection Technology for the Pressurizer Surge Nozzle to Vessel Weld

1.
DayaBay Nuclear Power Operations and Management Co., Ltd., Shenzhen, Guangdong, 518000, China
2.
CGNPC Inspection Technology Co., Ltd., Suzhou, Jiangsu, 215004, China
3.
National Engineering Research Center for Nuclear Power Plant Safety & Reliability, Suzhou, Jiangsu, 215004, China

摘要: 核电厂稳压器波动管接管与底封头焊缝结构的特殊性引起单侧可达和球形检测面导致较大定位偏差的问题，针对这2个问题研发相控阵超声检测（PAUT）技术与缺陷定位修正算法，并在带自然缺陷的模拟试块上进行验证与射线检测结果对比。结果表明，结合缺陷定位修正算法，PAUT技术满足能力验证的要求，检出能力与射线检测相当。
- 波动管接管与底封头焊缝 /
- 球形检测面 /
- 定位修正 /
- 相控阵超声检测（PAUT）
Abstract: In response to the single-sided accessibility issue caused by the weld structure and the significant positioning deviation caused by spherical detection surface in the surge nozzle to vessel weld of pressurizer in nuclear power plant, a phased array ultrasonic inspection (PAUT) technology and a defect positioning correction algorithm are developed, which are verified in a simulated body with natural defects and compared with the results of radiographic inspection. The results show that, combined with the defect positioning correction algorithm, the PAUT technology meets the requirements of the performance demonstration, and the detection capability is equivalent to that of radiographic inspection.
- Surge nozzle to vessel weld /
- Spherical detection surface /
- Positioning correction /
- Phased array ultrasonic testing (PAUT)

图 1 波动管接管与底封头焊缝示意图

Figure 1. Diagram of Surge Nozzle to Vessel Weld

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图 2 探头声场径向扫查仿真结果示意图

Figure 2. Sound Field Simulation of Probe

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图 3 径向位置和深度修正

Figure 3. Radial Position and Depth Correction

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图 4 周向位置及深度修正

Figure 4. Circumferential Position and Depth Correction

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图 5 PAUT与RT测长偏差对比

Figure 5. Length Deviation Comparison of PAUT and RT

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表 1 相控阵探头聚焦法则

Table 1. Laws of Phased Array Probe

聚焦法则	晶片数量	检查方向	−6 dB的聚焦深度^②
FS30 40°~70°^①	16	径向	0~26.0 mm
FS90 30°~60°	32	径向	21.2~90.0 mm
FS30 40°~70°	16	周向	0~26.0 mm
FS90 30°~60°	32	周向	21.2~90.0 mm
注：①表示聚焦法则采用声程聚焦，聚焦声程为30 mm，聚焦角度范围为40°~70°，其余的聚焦法则类同；②在该深度（壁厚方向）范围内至少存在角度差为10°以上声束

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表 2 稳压器模拟试块缺陷参数

Table 2. Defect Parameters of Pressurizer Mock-Up

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