VTT TECHNICAL RESEARCH CENTRE OF FINLAND LTD

Research and Development

on NDE field IAEA Technical Meeting on the Optimization of

Non-Destructive Examination and In-Service

Inspection to Improve Nuclear Power Plant

Performance

Ari Koskinen

Technical Research Centre of Finland Ltd.

2 2 2017-04-10

NDE possibilities at VTT

Qualified NDE technology

Ultrasonic and eddy current technology

Mechanised ultrasonic inspections

Analysing methods

Qualification of NDE

Simulation (UT and ET)

Focus on UT/ET development for demanding components, analysis and risk based inspection

Evaluation of condition using non-destructive

evaluation

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Ongoing project examples

to Assess Reliability of

Emerging Non-destructive

Techniques for Dissimilar Metal

PARENT

SAFIR2018 The Finnish Research

Programme on Nuclear Power

Plant Safety 2015 - 2018

Development of NDE for the

nuclear waste disposal canisters

LNPP inspection development

(ET)

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SAFIR2018, WANDA NDE of NPP primary circuit components and concrete

infrastructure

WANDA

WP 1

NDE on NPP primary circuit

component materials

Task 1

Artificial defects for

primary circuits

Task 2

NDE simulation

Task 3

SG magnetite detection

Task 4

NDE of DMWs

WP 2

NDE of NPP concrete

infrastructure

Task 1&2

NDT methods for NPP RCS &

mockup

Task 3

NDE & RCS durability

performance

Task 4 Evaluation and calibration of monitoring sensor & systems

Task 5 Performance-based design & control of

concrete durability

5

NDE on primary circuit

components

- Piping butt weld test

block

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Fatigue cracks in austenitic butt weld

A tubular austenitic steel specimen with butt weld

Mechanical fatigue and Thermal fatigue cracks in fusion line of cooling line welding

Different phased array ultrasonic techniques.

Scanning also on the healthy weld

Differences in reflector properties on indications, gain the information from different defects

7

Austenitic Stainless Steel weld US and POD

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Austenitic weld inspection with US

AISI 316L stainless steel weld with machined EDM-notches

Used methods:

2,25 and 5 MHz linear phased array 40-75

Conventional ultrasonic inspection probes 45 and 60

1,5 MHz 2D matrix phased array 40-70 with skew angle 15

Simulation with 2,25 MHz phased array 40-75

Evaluate how the weld affects the amplitude

response from the different locations of the

weld

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Defects

4a 3a 2a 1a 4b 3b 2b 1b

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2,25 MHz POD curve depending on the location

11

Eddy Current modelling

on SG Magnetite with

CIVA and COMSOL

Magnetite Steel tube Probe

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CIVA and COMSOL ET modelling - amplitudes

Simulation of eddy current magnetite pile detection with a simple case

symmetric magnetite pile around the tube

Goal is to model a novel probe to detect the existence of the magnetite

pile, also asymmetric cases

Receiving and

transmitting coils

h=1.5 mm and

N=70 turns

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Transmitting coil height 1.5 mm, turns 70

Receiving coil height 8 mm turns 350

Magnetite layer thickness 3mm, ends in slope

CIVA and COMSOL modelling -Total amplitude and

phase angle

Coil distance 20 mm. Coil distance 40 mm.

14

NDE on NPP concrete

infrastructure

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NDE Research on Reinforced NPP Concrete

Structures

NDT methods for RCS

Sensors & monitoring approaches for

RCS

Reinforced concrete full scale wall mock-

up

Define the scope of the NDE mock-up

study in geometry, concrete

characteristics, reinforcement, NDE

NPP Reinforced Concrete Structures

presents challenges

Large wall cross section (e.g. > 1.0 m)

Increased reinforcement density with

complex detailing

Limited accessibility due to presence of

liners or other components

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NDE of steel cladded concrete beams

Determining capability to asses condition of structural typology

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NUGENIA+ project MAPAID

Goal to model and validate phased array ultrasonic testing (PAUT)

techniques for Non Destructive Evaluation (NDE) of dissimilar

metal welds (DMW) of nuclear power plants (NPP)

Bay Zoltn Nonprofit Ltd. for Applied Research, Hungary

Alternatives,

France

JV , a.s., Czech Rep.

VTT Technical Research Centre of Finland Ltd., Finland

Including participation in international PARENT-project

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Our approach in model assisted NDE

7. Realistic

POD - curve

5. Series of simulations with variation in size

3. Verification of

simulation

1. Crack

simulations

2. Measurement of fatigue cracks

4. Knowledge of crack parameter variation

6. Statistical models

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Measurements

7. Realistic

POD&ROC - curve

5. Series of

simulations with variation

in size

3. Verification of

simulation

1. Crack

simulations

2. Measurement

of fatigue cracks

4. Knowledge of

crack parameter variation 6.

Statistical models

CT-measurement from BAM

Animation done at VTT

UT-measurement done at VTT