The NDT regulations in Hungary.

The experience and qualification of

ENIQ Peter Pal Babics

Hungarian Atomic Energy Authority

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Technical Meeting on the Optimization of Non-Destructive Examination and In-Service Inspection to Improve

Nuclear Power Plant Performance

ESPOO 4 to 7 April, 2017

CONTENT

Introduction

Hungarian Code requirements

Qualification programs

Qualifications performed until 2017

Ongoing qualifications

Pre- and inservice inspection qualification

WWER 1200 NPP Pre-service qualification

Remarks and suggestion

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Inspection Qualification

Inspection qualification is the formal process for gaining confidence that the inspection system (the combination of equipment, inspection procedure and personnel) meets its required objectives under real circumstances.

European Methodology Performance Demonstration

(ENIQ, IAEA) ASME XI Appendix VIII

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Adoptation of ASME Code

The Hungarian regulatory rules do not explicitly determine the applicable

codes and standards neither for plant construction nor for ISI and IST. •

The adaptation of ISI program and the requirements are based on strength

analysis according to Section III. If the compliance cannot be verified

because of VVER characteristics or other reasons the ASME Code cannot be

used for the ISI requirements (acceptance flaw size, inspection period, etc.)

but extra requirements shall be developed and applied. It may be the former

ISI program requirement, or a new program based on the ASME which

justifies the safety requirements.

Hungary does not apply the Appendix VIII of Section XI (performance

demonstration) as a mandatory requirement. The qualification of ISI/NDE

systems (procedures, equipment and personnel) is carried out according to

the methodology developed by the European Network for Inspection and

Qualification (ENIQ) as well as related IAEA document.

For example, the UT Examination of the RPV cylindrical part had to be

performed from outside according to the previous ISI program however

according to ASME it shall be done from inside. If the examination from

both outside and inside will be performed the results should be

harmonized.

The safety classification of the component according to the Hungarian

regulation and that of the Section III should be assessed and, in a

borderline case, individual evaluation is necessary.

International experience related to the application of the ASME

requirements should be reviewed.

A systematic training program shall be developed prior to the application

of ASME requirements.

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Inspection

Qualification

Practical

Trials

Open

Trial

Blind

Trial

Technical

Justification

Qualification of inspection

procedure and equipment

Qualification

of personnel

Principle of European Methodology

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Hungarian Code requirements for Inspection Qualification

1997-2005 Nuclear Safety Guide No 4.1

In the case of highly important inspections the Utility or the Regulator can initiate the entire or partial qualification of inspection procedure equipment or personnel. The qualification should be determined according to internationally recognized methodology (ENIQ).

2005-2011 Nuclear Safety Regulations Vol. 4, para 9.010

ISI on primary/secondary pressure boundary surface should be performed by means of qualified NDT inspections. The scope and level of qualification should be determined according to internationally applied procedures (ENIQ).

2011- Nuclear Safety Regulations Vol. 4, para 4.6.4.1400.

ISI performed on systems and system elements should be qualified in order to prove, that the inspection system – inspection equipment, inspection procedure and the inspection personnel - able to fulfill the requirements under real circumstances.

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QUALIFICATION PROGRAMS

The regulations did not and do not define the exact scope of inspections to be

qualified in terms of NDT method and component to be inspected

In 2003 the qualification of internal UT of RPV has been required by regulatory

decree

The qualifications have been planned and executed based on medium term (2-3

years) qualification programs

The qualification programs has been compiled based on qualification principles

proposed by the utility and approved by Regulatory Body

The proposed inspection qualification programs has been finalized in agreement with

the Regulatory Body

Current inspection qualification program covers the period 2013-2016

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Qualifications completed until 2016

In period 2000-2016 – 30 inspection qualifications have been completed according to

the qualification programs approved by the Hungarian Regulatory Body

Majority of qualifications are related to mechanized UT (18) and mechanized ET (10) of

primary main components

Certificates are issued for following inspection organizations:

Paks NPP NDT laboratory (Material Testing Section) (18)

SKODA JS as. (Czech Republic) (8)

INETEC (Croatia) (4)

Simplified qualifications

Transfer of qualification performed in other country (5)

Qualifications renewed (2)

Due to modernization of inspection equipment (2)

Qualification of NDT personnel

EPRI QDA qualification for SG heat exchanger tube ET inspection

Blind test for mechanized UT of austenitic pipe welds (pilot qualification with SQC)

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Qualified RPV inspections (1)

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No Inspection area NDT Method Insp. org. Date

1 Cladding

from ID

Mechanized UT

Mechanized. ET

SKODA

INETEC

SKODA

INETEC

2004

2011

2008

2011

2 Shell welds

from ID

Mechanized UT

Mechanized. ET

SKODA

INETEC

SKODA

INETEC

2005

2011

2008

2011

3 Lower part shell

welds and base

metal from OD

Mechanized UT

Paks NPP 2010

4 Nozzle shell

welds from OD

Mechanized UT

Paks NPP 2014

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4

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1

Qualified RPV inspections (2)

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No Inspection area NDT Method Insp. org. Date

1 Dn500 Nozzle inner

radii

from ID

Mechanized UT

Mechanized ET

SKODA

INETEC

SKODA

INETEC

2006

2011

2008

2011

2 Dn500 DMW weld

from ID

Mechanized UT SKODA

INETEC

2009

2011

3 Dn500 DMW weld

from OD

Mechanized UT

Paks NPP 2011

4 Dn500 aust. weld

from ID

Mechanized UT

INETEC 2011

5 Dn500 aust. weld

from OD

Mechanized UT

Paks NPP 2008

6 Dn250 Nozzle to

safe-end weld

from OD

Mechanized UT

Paks NPP 2011

3 4

1 2

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Qualified RPV inspections (3)

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No Insp. area NDT Method Insp. org. Date

1 M140 studs Mechanized UT

Mechanized ET

SKODA

INETEC

SKODA

INETEC

2011

2012

2011

2012

2 M140 threaded

holes

Mechanized ET SKODA

INETEC

2011

2012

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Qualified Steam Generator inspections (Paks NPP)

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No Inspection area NDT Method Date

1 Heat exchanger

tubes

Mechanized ET 2004

2 Primary collector

bolts

Mechanized ET 2012

3 Primary collector

threaded holes

Mechanized UT

Mechanized ET

2002

2011

4 Collector DMW Mechanized UT

2009

5 Primary collector

welds

Mechanized UT 2014

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2

3

4

5

Qualified primary component inspections (Paks NPP)

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No Inspection area NDT Method Date

1 Main loop

circumferential welds

Mechanized UT 2008

2 Main loop elbow

longitudinal weld

Mechanized UT 2008

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1

Qualified primary component inspections (Paks NPP)

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No Inspection area NDT Method Date

1 MCP bolts MT

Mechanized ET

2005

2012

2 Pressurizer outlet

nozzle DMW

Mechanized UT 2009

3 Dn200-300

circumferential

austenitic welds

Mechanized UT 2013

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Qualifications in period 2013-16

1. External Mechanized UT of Reactor Pressure Vessel circumferential welds of

nozzle ring (Weld No 6 and No 7) - completed

2. Mechanized UT of Steam Generator primary collector

circumferential welds - completed

3. Renewal of qualification of mechanized UT for Steam Generator primary collector

threaded holes (because of upgrading of the UT equipment) - completed

4. Qualification of manual UT

of class 1&2 ferritic primary component welds – in progress

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Qualification of manual UT of class 1&2 ferritic primary component welds

Subject: Inspection areas covered by two Generic UT procedures UT-VU-011/AVO – Ultrasonic inspection of base metal a welded joints of ferrite-

perlite steel components with diameter larger than 465 mm and wall thickness larger than 15 mm

UT-VU-012/AVO – Ultrasonic inspection of base metal a welded joints of ferrite-perlite steel components with diameter larger than 25 mm and wall thickness between 6-50 mm

Manual UT of RPV Closure Head circumferential weld and base metal

Manual UT of SG housing welds and connected nozzle/collector/manhole welds

Manual UT of Pressurizer housing welds and injection nozzle welds

Manual UT of Hydroaccumulator housing welds

Manual UT of some dissimilar/or austenitic welds

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Manual UT of RPV Closure Head

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• Base metal

• Circumferential weld

• Instrumentation nozzle fixing weld (DMW)

Manual UT of SG welds

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• Circumferential shell welds

• Longitudinal shell welds

• Steam collector welds

• Weld between manhole and housing

Manual UT of SG welds

• Weld between collector and housing

• Emergency feedwater nozzle welds

• (austenitic&dissimilar)

Manual UT of Pressurizer welds

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• Circumferential shell welds

• Injection nozzle welds (austenitic&dissimilar)

Manual UT of Hydroaccumulator welds

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• Circumferential shell welds

• Longitudinal shell welds

Status of qualification of manual UT of class 1&2 primary ferritic component welds

Scope: qualification of inspection procedure and equipment

Target flaw size calculation completed for all inspection areas (including austenitic and dissimilar welds)

Draft Technical Specifications are completed, first revision by IQB has been performed.

Draft Inspection Procedures are completed, first revision by IQB has been performed.

Proposal for qualification test pieces to be used are under preparation

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WWER 1200 NPP Pre- and inservice inspection qualification

1997 Preparation of Guidelines for qualification of ISI systems for WWER

NPPs (WWER-SC-123)

PNAE-G-7-8-89 (ISI programs 4 year)

New power plant construction program started

NP-085-15 (ISI program 10 years)

Not part of the Russian legislation of the ISI qualification

It has not been issued a new preservice inspection regulation.

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Remarks and suggestions relating qualifications

Conducting qualifications based on ENIQ documentations has become a

routine, the recommended practice documents provide suitable

background to this.

Difficulties have arisen during the execution of manual UT examinations.

The Hungarian authorities are facing new challenges in connection with

conducting preservice inspection and regulations.

There are new Russian regulations for ISI only, which do not contain the

EU approach to qualification.

New preservice inspection regulations have not been issued in Russia, so

they have only a 25-year old outdated regulation, which does not refer to

qualification, either.

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Thank you for your attention!