Eddy Current Standard Tube Development for the Foreign Material Detection and Identification J.A.PARK 1, K.M.MIN 1, H.H.KIM 1, S.H.KWON 1, J.I.KIM 2 1. Universal Monitoring & Inspection Inc. (www.umi.co.kr) 2. Korea Hydro & Nuclear Power Co. Ltd. (www.khnp.co.kr) 1
Introduction Why do we need EC Reference STD Tubes? By virtue of EC LP STD tubes Methodology Fabrication of LP STD Tubes Review & Results STD Tubes for LP D & I Conclusions CONTENTS 2
INTRODUCTION Why do we need EC Reference STD Tubes? Multiple Variations of the Specimens: Cracking Surface Roughness Conductivity & Permeability Variations Other materials Conditions Above mentioned specimens are already developed In the absence of LP STD Tubes Experienced Based LP Data Analysis Trigger Human Errors 3
INTRODUCTION By virtue of EC LP STD Tubes Efficient and objective data analysis Capable of comparison between the materials properties (Ferro or Non-ferro) Providing information for the engineering evaluation of LP locating secondary side of the SG tubes Understanding and policy against the LP inflow 4
METHODOLOGY Tube Material: Inconel 600 HTMA Specification OD: 0.750 inch, Thickness: 0.042 inch Loose parts Material Ferro: CS, 430SS, TSR, Sludge (H & I) Non-ferro: Cu, Ti, 304SS Specifications Diameter: 4.5mm, Thickness: 0.5mm
EC Data Acq. & Analysis METHODOLOGY Freq. Gen.: MIZ-80iD Applied Frequency Bobbin: 550, 300, 150, 20 khz MRPC: 400, 300, 100, 20, 700 khz Acq. & Ana. S/W: ENS 3.1 Probe Bobbin: M/A-610-ULC MRPC: +PT-610-3C Motor Unit : 610-9D Test Speed Bobbin: 1600 SPS, 40IPS MRPC: 800RPM, 1600SPS, 0.4IPS Workstation: HP C3750 EC STD Tubes: ASME & Notch
METHODOLOGY LP STD Tube Manufacturing Process (Case by Case) LP STD tubes and manufacturing processes are patent pending.
METHODOLOGY Soft Sludge Reproduction Process
METHODOLOGY Hard Sludge Reproduction Process
REVIEW & RESULTS Liftoff effect Loci on Imp. Plane Movement of Material Points by Freq. Changes (a) Low Freq., 20kHz; (b) Medium Freq., 100kHz; and (c) High Freq., 1000kHz Conductivity & Liftoff Loci on Imp. Plane Source : NDT Handbook 3rd Ed. Vol. V Electromagnetic Testing
위상각 (Deg.) REVIEW & RESULTS In c o n el 60 0 및 690 전열관의 lo o se p a rt 별위상비교 40 0 350 30 0 In c o n e l 60 0 In c o n e l 690 250 20 0 150 10 0 Different LP Phase Angle on the IN600, 690 Respectively 50 Similar Phase Angle 0 of CS on Inconel 690 and CU TI SS 60 0 80 0 690 CS SLG HSG Soft Sludge on Inconel 600 Tubes 재질별 Lo o se Pa rt Source : 2008 KSNT Fall Conference Proceedings EC Signal Analysis and Review of Foreign Materials on Inconel Alloy Tubes, S.Y.KIM, J.A.PARK, K.M.MIN, H.S. HAN, K.S. SHIN
REVIEW & RESULTS Metal Conductivity Resistivity MS m -1 IACS Ohm m µ Ohm cm Inconel 600 1.72 9.8X10-7 98.00 Cu 58.00 100 1.72X10-8 1.72 Ti 1.798 3.10 5.562X10-7 55.62 304SS 2.39 7.2X10-7 72.00 CS 11.81 1.460X10-7 14.60 430SS 2.87 6.0X10-7 60.00 H-SLG S-SLG W_F Site Material Fe 3 O 4 (Oxidized Iron)
REVIEW & RESULTS S-SLG H-SLG TSR 430SS CS S-SLG H-SLG TSR 430SS CS Cu Ti 304SS CS 430SS Cu Ti 304SS CS 430SS 304SS 304SS TSR TSR Ti Ti H-SLG H-SLG Cu Cu S-SLG S-SLG Bobbin Coil Strip Chart MRPC Strip Chart
Ti REVIEW & RESULTS Bobbin Diff MRPC Panc. Bobbin Diff MRPC Panc. Bobbin Abs. MRPC +PT Bobbin Abs. MRPC +PT Lissajous & Strip Chart of Cu (Non-Ferro) Lissajous & Strip Chart of Ti (Non-Ferro)
REVIEW & RESULTS Bobbin Diff MRPC Panc. Bobbin Diff MRPC Panc. Bobbin Abs. MRPC +PT Bobbin Abs. MRPC +PT Lissajous & Strip Chart of 304SS (Non-Ferro) Lissajous & Strip Chart of CS (Ferro)
REVIEW & RESULTS Bobbin Diff MRPC Panc. Bobbin Diff MRPC Panc. Bobbin Abs. MRPC +PT Bobbin Abs. MRPC +PT Lissajous & Strip Chart of 430SS (Ferro) Lissajous & Strip Chart of H-SLG (Ferro)
REVIEW & RESULTS Bobbin Diff MRPC Panc. Bobbin Abs. MRPC +PT Lissajous & Strip Chart of S-SLG (Ferro)
CONCLUSIONS 1. For the proper monitoring and evaluation of the foreign materials contacted on the secondary side of the tubes, it is imperative to introduce LP standard tube. 2. LP materials are categorized as ferro/non-ferro and characteristic EC signal patterns were shown according to the LP properties. 3. Soft and hard sludge was properly fabricated and could be applicable for site sludge pile simulation 4. By applying EC LP STD tubes, the detectability, identification and contact geometry between tubes was clearly enhanced. 5. EC LP STD tubes has been successfully developed and customized for the site application.
REFERENCES 1. EPRI, SGMP: Pressurized Water Reactor Steam Generator Examination Guidelines, Rev. 7 2. Sang-Yoon Kim et. al, EC Signal Analysis and Review of Foreign Materials on Inconel Alloy Tubes, 2008 KSNT Fall Conference Proceedings 3. 1998 ASME Boiler and Pressure Vessel Code Sec. V & XI 4. V. S. Cecco et. al. Eddy Current Testing, AECL 5. ASNT, NDT Handbook, Vol. 5 Electromagnetic Testing, 3 rd Ed.
QUESTIONS? Thank You! Jung Am, PARK (japark@umi.co.kr) GM, Universal Monitoring & Inspection Inc. www.umi.co.kr 20