Eddy Current Standard Tube Development for the

Foreign Material Detection and Identification

J.A.PARK1, K.M.MIN1, H.H.KIM1, S.H.KWON1, J.I.KIM2

1. Universal Monitoring & Inspection Inc. (www.umi.co.kr)

2. Korea Hydro & Nuclear Power Co. Ltd. (www.khnp.co.kr)

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• 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

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• 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

INTRODUCTION

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• 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

INTRODUCTION

• 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

METHODOLOGY

• 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

• LP STD Tube Manufacturing Process (Case by Case)

METHODOLOGY

☞ LP STD tubes and manufacturing processes are patent pending.

• Soft Sludge Reproduction Process

METHODOLOGY

• Hard Sludge Reproduction Process

METHODOLOGY

REVIEW & RESULTS

Liftoff effect Loci

on Imp. Plane

Conductivity & Liftoff

Loci on Imp. Plane

Movement of Material

Points by Freq.

Changes

(a) Low Freq., 20kHz;

(b) Medium Freq.,

100kHz; and (c) High

Freq., 1000kHz

Source : NDT

Handbook 3rd Ed.

Vol. V

Electromagnetic

Testing

REVIEW & RESULTS

In conel 60 0 및 690 전열관의 loose p a rt별 위상비교

0

50

10 0

150

20 0

250

30 0

350

40 0

C U TI SS 60 0 80 0 690 C S SLG HSG

재질별 Lo o se Pa rt

위상

각(D

eg

.)

In c on e l 60 0

In c on e l 690

Different LP Phase Angle on the IN600, 690 Respectively

Similar Phase Angle of CS on Inconel 690 and Soft Sludge on Inconel 600 Tubes

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

MetalConductivity 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 W_F Site Material

S-SLG Fe3O4 (Oxidized Iron)

REVIEW & RESULTS

Cu

Ti

304SS

CS

430SS

H-SLG

S-SLGCu

Ti

304SS

CS

430SS

H-SLG

S-SLG

TSR

TSR

Bobbin Coil Strip Chart

Cu

Ti

304SS

CS

430SS

H-SLG

S-SLG

TSR

Cu

Ti

304SS

CS

430SS

H-SLG

S-SLG

TSR

MRPC Strip Chart

REVIEW & RESULTS

Bobbin Diff MRPC Panc.

Bobbin Abs. MRPC +PT

Lissajous & Strip Chart of Cu (Non-Ferro)

Ti

Bobbin Diff MRPC Panc.

Bobbin Abs. MRPC +PT

Lissajous & Strip Chart of Ti (Non-Ferro)

REVIEW & RESULTS

Lissajous & Strip Chart of 304SS (Non-Ferro) Lissajous & Strip Chart of CS (Ferro)

Bobbin Diff MRPC Panc.

Bobbin Abs. MRPC +PT

Bobbin Diff MRPC Panc.

Bobbin Abs. MRPC +PT

REVIEW & RESULTS

Bobbin Diff MRPC Panc.

Bobbin Abs. MRPC +PT

Lissajous & Strip Chart of 430SS (Ferro)

Bobbin Diff MRPC Panc.

Bobbin Abs. MRPC +PT

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, 3rd Ed.”

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QUESTIONS ?

Thank You !

Jung Am, PARK (japark@umi.co.kr)GM, Universal Monitoring & Inspection Inc.

www.umi.co.kr