Effects of Magnetic Phase on the ECT Signal in the SG Tubes

Park, Duck-Gun; Ryu, Kwon-Sang; Son, Derac; Cheong, Yong Moo

doi:10.1109/tmag.2009.2034537

Cited by 2 publications

(2 citation statements)

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“…The existence of MP in a SGT was verified from a retired SGT (Inconel 600) of Kori-1 NPP in Korea by showing a permanent magnet attached to the fragment of a SGT containing the MP [1]. The axial defects in a SGT can be detected by conventional ECT, but the CDs and CMPs are very difficult to detect.…”

Section: Methodsmentioning

confidence: 99%

“…The materials used for SGT are Inconel alloys, which are non-magnetic and have good corrosion-resistance. On the other hand, MPs and defects are partly generated in the SGT due to the high temperatures and stresses because the temperature and pressure of water in SGTs are very high due to nuclear fission [1]. The temperature and pressure is approximately 280 o C and 15.5 MPa, respectively.…”

Section: Introductionmentioning

confidence: 99%

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Magnetic Field Simulation for Circumferential Magnetic Phase Produced in Steam Generator Tube

Ryu¹,

Son²,

Park³

et al. 2011

Journal of Magnetics

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Steam generator tubes (SGTs) in nuclear power plants (NPPs) are a boundary between the primary side generating heat by nuclear fission and the secondary side generating electric power by a turbine. The water inside the SGT is high temperature and high pressure. Therefore, defects and magnetic phases (MPs) are partly produced in non-magnetic SGT by high stresses and temperatures. This causes trouble regarding the safety of SGTs but it is difficult to detect the MP using the conventional eddy current technique (ECT). In particular, a circumferential defect (CD) and circumferential magnetic phase (CMP) cannot detected by ECT. Consequently, a new method is needed to detect CDs and CMPs in SGT. A new U-type yoke with two types of coils was designed and the reactance signal by the CMPs and CDs in the SGT material was simulated.

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Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%