Activity Report of Condition-based Maintenance Technology (CMT) Panel ofMaintenance Technology (CMT) Panel of Japan Society of Maintenology

Panel Chair: Mitsuru UesakaPanel Chair: Mitsuru Uesaka

Nuclear Professional SchoolNuclear Professional School, University of Tokyoy y

Condition Based Maintenance TechnologyPanel in Japan Society of Maintenology

Establish Reasonable and

Chair: Prof. K. Miya

Establish Reasonable and Quantitative Evaluation of Nuclear Power Plants and contribute to Safety and High Operation Rate.

Assessment WG chaired by Dr.A.YamaguchiTechnology WG chaired by M.Uesaka

F d P t i i B i-Focused on Pumps containing Bearings now-Fracture Test and In-situ Measurements by practical

methods of Vibration AE Oil and Debris Analysis andmethods of Vibration, AE, Oil and Debris Analysis, and Thermography

-New TechniquesGuide-wave UT, EMAT, On-site RT, Optical Fiber Brug Peak Measurement.

E-Journal of Advanced Maintenance (EJAM)Occasional Topics (OT) 1_Uesaka

Collaborated by Mr.N.Sasaki and Mr.M.KawamataTROBOTEX Inc.

Bearing ExperimentFor Condition Based Maintenance to Nuclear Plants

Acoustic Emission Count

We will plan to get still images of rotating bearing.->Collaboration with AE, Neutron, and X-ray

Electromagnetic Signal Pick-up for Real Horizontal Circulating Pump by IIU Co.Ltdg p y

at Technical Training Center, Nuclear and Industrial Safety Agency, METIy g y,

検証試験装置（横型検証試験装置（横型ポンプ）CH2CH2

CH1

CH3

CH4

1. Impellar Axial Electomagnetic

Measurement2. Impellar Radial Electomagnetic3. Bearing Radial Electomagnetic4. Bearing Radial Vibration

EJAM OT1_Uesaka (2009)

Spectrum of Electromagnetic Signal from Impeller （CH1）

0.018

0.020

FFT (0-1kHz)

0 12

0.14

FFT (0-10kHz)

from Impeller （CH1）

Hi h f

0.010

0.012

0.014

0.016

Sig

nal(

V)

0 06

0.08

0.10

0.12

Sig

nal(

V)

297.6Hz=6*49.6Hz High frequency noise is large

Rotation speed

0 000

0.002

0.004

0.006

0.008

S

0 00

0.02

0.04

0.06S

0 100 200 300 400 500 600 700 800 900 10000.000

Frequency (Hz)

0 1000 2000 3000 4000 5000 6000 7000 8000 9000 100000.00

Frequency (Hz)

Frequency of the impeller (297 6Hz) isFiltered signal (0.1sec)

Spectrum of EM signals (0‐1kHz) Spectrum of EM signals (0‐10kHz)

Frequency of the impeller (297.6Hz) is detected according to the spectrum.High frequency noise is very large. It is not easy to identify the impeller from 0.02

0.04

0.06

)not easy to identify the impeller from the raw signals.

It is possible to identify the impeller after applying a LPF (Low passed 0 04

-0.02

0.00S

igna

l(V

)

after applying a LPF (Low passed filter) to the raw signals.

0.00 0.01 0.02 0.03 0.04 0.05 0.06 0.07 0.08 0.09 0.10-0.06

-0.04

Time(sec)

FFT Signal （CH3） for Bearing

0 025

0.030

FFT (0-10kHz)

0.018

0.020

FFT (0-1kHz)

g （ ） g

0.015

0.020

0.025

Sig

nal(

V)

0.010

0.012

0.014

0.016

Sig

nal(

V)

0 000

0.005

0.010

S

0 000

0.002

0.004

0.006

0.008

Filtered FFT (1-10kHz)

0 1000 2000 3000 4000 5000 6000 7000 8000 9000 100000.000

Frequency (Hz)

0 100 200 300 400 500 600 700 800 900 10000.000

Frequency (Hz)

0‐1kHz 0‐10kHz

0 012

0.014

0.016

0.018

0.020

) Frequency component

Revolutional frequency andthird harmonics

0.004

0.006

0.008

0.010

0.012

Sig

nal(

V) Frequency component 

due to defects is not observed.

0 100 200 300 400 500 600 700 800 900 10000.000

0.002

Frequency (Hz)

EJAM OT1_Uesaka (2009)

Guided-wave UT methodTokushima University

Experimental and theoretical studyExperimental and theoretical study of circumferential guided waves for health monitoringof hollow cylindrical structures

Appearance

y

Appearance of the experimental instrument

Identifications of circumferential defect positionsIdentifications of circumferential defect positionsAbstractFollowing theoretical and experimental studies have been carried out for an efficient defect detections using

Defect

150˚

180˚

Identifications of circumferential defect positionsIdentifications of circumferential defect positions

efficient defect detections using circumferential guided waves. The primary aim of the research is for health monitoring of hollow cylindrical structures.(1)Theoretical calculations of dispersion relation and wave structures of the

30˚

90˚

60˚

60˚

90˚

120˚

relation and wave structures of the circumferential guided wave. (2)Specially designed holder for both the specimen and the sensor used.(3)Experimental identifications of both  

180˚150˚120˚

defectfree

30˚

angular positions and depth of a defect.The experimental results agreed well withthe theoretical estimates. Fig.1 Defect and sensor positions Fig.2     Time domain signals 

for different defect positions.

EMAT-EC Multi-probeInstitute of Fluid Science, Tohoku University

Multi-probe for evaluation of fatigue cracks

, y

42 mm

22 mm22 mm

Φ0.12 mm, 70turn

Center frequency : 1.0 MHz (Shear Wave)

Incident angle θ : 39° Coil 2: 70 turns(Race-track shape)

Coil 1: 70 turns(Disk type)

Incident angle θ : 39

8

EMAT mode：coil 2 is used as transmitter and receiver.ECT mode：coil 1 is used as an exciter, coil 2 as an detector.

EJAM OT1_Uesaka (2009)

Portable!!

IntroductionDevelopment of X-ray Nondestructive Testing System with Portable Linac

Conventional Linac Based X-ray NDT System -> Big!

Schematic configuration

Development of Portable & Compact X-ray NDT System ith X b d Li

Our Feature

・ 250 kW MagnetronX band Linac (9 4 GHz)

with X-band Linac

RF Window

・ X-band Linac (9.4 GHz)・ Max Energy 950 keV

e- Beam

e- gun

Comparison with other system p yVARIAN

LINATRONA.S.&E Inc.

DesignOut systemDeveloped

S bandFrequency S-band(2.856GHz) X-band (9.5GHz) X-band (9.4GHz)

Acceleration method Linac Linac LinacmethodSize of linac 600mm 100mm 300mmRF source Klystron Magnetron MagnetronRF power some MW 1.2MW 250kWRF source size 1×1×1 m3 1×1×1 m3 0.1×0.2×0.2 m3

Use Off-site On-site On-siteUse Off-site On-site On-siteDose rate 0.15Gy@1m/min 0.2Gy@1m/min 0.2Gy@1m/minSpatial

l ti 3mm Undecided 1mmresolution 3mm Undecided 1mm

Stability of Intensity ±3% ±3% ±1.5%

Beam energy is 950keV in all system.

EJAM OT1_Uesaka (2009)

Regulation of Radiation Safety in JapanRegulation of Radiation Safety in Japanfor Electron Linear Accelerators

Below 1 MeVAllowed to be used outside radiationAllowed to be used outside radiation

controlled area with reasonable local shielding and protection systemBelow 4 MeV

Allowed to be used outside radiation controlled area only for inspection of bridgesp gOver 6 MeV

Should be used in radiation controlled arearadiation controlled area for Medical use and Scientifcand security- applications

System configurationy g

Magnetron

Heater

Power Supply TuneFrequency X-band (9 4GHz)

Design parameter

g250kW

Power Supply

RF window

Dummy Load

Magnetron HV

q y (9.4GHz)

Length of linac 300mm

RF source Magnetron

AFC (auto frequency controller)

Circulator

RFGun HV

RF power 250kW

Beam energy 950keV

Gun current 400mA

20kVElectron

Gun

RF window

Target and

e−

x-ray

Pulse length 2μsec

Repetition 500pps

Dose rate 0.2Gy/min@Accelerating Tube Target and

CollimatorDose rate 1m

Block diagram of our system

A 20kV electron beam is generated by the thermonic gunA 20kV electron beam is generated by the thermonic gun. This beam current is 400mA. The magnetron feeds RF to accelerating tube, and electromagnetic field is generated in accelerating tube. The electron beam is accelerated to g950keV. Finally, the electron beam collide to metal target and generates X-ray by bremsstrahlung.

Photograph of accelerating tube

EJAM OT1_Uesaka (2009)

Measurement of discrimination ability by i i t t tusing wire type penetrometer

Thickness of iron plate : 12 9 mmThickness of iron plate :17.2 mmWe can distinguish as far as 0 5 Thickness of iron plate : 12.9 mm

We can distinguish 0.4 mm wire.We can distinguish as far as 0.5 mm wire. We can NOT distinguish 0.4 mm wire.

X-ray spot is ~2mm.

Discrimination ability

Diameter of wire=

Thickness of plate

Image of wire type penetrometer

The discrimination ability is about 3 %

Concept of Real-Time ImagingLinac X-ray Source -> Pulse drive

R t ti t f X l

ΔT = nδt

Reputation rate of X-ray pulse

Synchronize

Impeller’s rotating rate.

ΔT = nδt

We can get still images without rotation stopping.EJAM OT1_Uesaka (2009)

Experimental Setup

Mi Li ht R fl tMirror: Light ReflectorMark: Sign (Pb plate)

X-ray film mark “X”PC fan

Results

X mark

X mark

Stop Not Sync. Sync.IP Images

Synchronized

CsI Images

EJAM OT1_Uesaka (2009)

Neutron Diffraction Devise J-PARC Proton Synchrotron and Neutron Spallation Source

And(Takumi)

J-PARC Proton Synchrotron and Neutron SpallationSource And Residual Strain/Stress MeasurementResidual Strain/Stress Measurement γFeAlloy

Residual Strain/Stress Residual Strain/Stress MeasurementMeasurement

γ yΦ10mm x h50mm

J-PARC Neutron Beamlines

8.Super High Resolution  Powder Diffractometer   ( SHRPD)

5. NOD

4. Neutron‐Nucleus reaction  Measurement Facilities (NNRI)

3 Bi l i l N t

10. Neutron Beam‐line for Observation and Research Use (NOBORU)11. High‐pressure and High‐temperature Material 

⊿d/d (%)

Resolution of Strain

3. Biological Neutron    

1.4d Space Access Neutron Spectrometer

12. High Resolution  Chopper Spectrometer 

Diffractometer (iBIX)

(HRC)

(4SEASONS)

First Experimental Hall→

Science Beamline

2. Protein Dynamics Analysis Instrument (DIANA)

(%)

Super HRPD(Powder@KEk) 0.03

iMATERIA(Mat Struc Analy) 0.1

21. High‐intensity Versatile Neutron Total Diffractometer (NOVA)

20. IBARAGI Material Design Diffractometer (iMATERIA)

14. AMATERAS

15. High‐intensity Smaller 

(4SEASONS)

Second Experimental Hall→

NOVA(All Scattering Angle) 0.2

TAKUMI(Residual Stress) 0.15

19. Engineering Materials Diffractometer (TAKUMI)

16. Neutron Reflectometer with Horizontal‐sample Geometry 

g yAngle Neutron Scattering (HI‐SANS)

Coupled Moderator

Decoupled Moderator

Poisoned Moderator

(ARISA‐II)

Summary & SubjectsSummary & Subjects

Synchronized transmission on-line imaging by 950 keVSynchronized transmission on line imaging by 950 keVportable X-ray source has been performed.Practical bearing containing ~0.5 mm defect at impeller g g pplans to be tested. Further, the lifetime evaluation test by vibration, AE, oil and debris analysis and thermography is under way.Residual strain/stress before macroscopic cracks is going to be measured.Reliable lifetime evaluation of bearing using overall high-tech

t i th fi l t t f th CMT lmeasurements is the final target of the CMT panel.

EJAM OT1_Uesaka (2009)