areva: experience in internals - bulatom-bg.org 3/report... · areva: experience in dismantling and...

AREVA: Experience in Dismantling and Packing of Pressure Vessel and Core Internals

Jan Hendrik BruhnAREVA NP GmbH/ IBRZ-GVarna, June 10th 2010

AREVA: Experience in Dismantling and Packing of Pre ssure Vessel and Core Internals - Bulgarian Nuclear Energy - J.H.Bruhn - Varna, June 10th 2010 - AREVA NP GmbH Proprietary - © AREVA NP - p.3

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Content

►Stade NPP PWRRPV Internals Segmentation and Packing

►Wuergassen NPP BWRRPV and Internals Segmentation and Packing

►General Requirementsfor Dismantling Projects

Chapter 1

General Requirements forDismantling Projects


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Engineering RequirementsRadiation protection requirements

� Optimized dismantling, cutting and packing performance

� Appropriate design of the equipment

� Provision of shielding due to high radiation

Selection of appropriate cutting techniques

� Fulfillment of segmentation and packing requirements

� Minimization of secondary waste

Time scheduling

� Production control

� Detailled work sequences

� Parallel activities

Detailed planning

� Preparation & mock-up tests

� Cutting & packing plan

� On-site performance


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Cold cutting processes

�Mechanical• Sawing• Milling• Shearing• Nibbling• Unscrewing• Grinding• Drilling• Wire sawing (rope, diamond)• Etc.

�Hydraulic• Water abrasive suspension

slicing (WASS)• Nitrojet cutting• Etc.

Thermal cutting processes�Thermal

• Torch cutting• Powder flame cutting• Laser cutting• Plasma cutting• Oxygen lance• Petrogen cutting (gasoline-oxygen)• Etc.

�Electro-thermal• Electric discharge machining (EDM)• Contact arc metal cutting (CAMC)• Etc.

Cutting Techniques (1)


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Main advantages of cold cutting

� No considerable generation of secondary waste

� No generation of aerosols and hydrosols

� Appropriate cutting speeds

� Reliable technologies

� Radiation resistant applications

� Generated chips can be collected easily

Cutting Techniques (2)


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Concrete Example:Water Abrasive Suspension Slicing

Advantages of Water Abrasive Suspension Slicing

� Cutting simple as well as complex geometries

� Easy to operate and reliable cutting technique

� Cutting up to 200 mm stainless steel

� Independent of water depth and oxide layer

� No generation and release of aerosols

� Generates easy to handle and packable fragments

� Proven and effective water purification system in use

� Replacement of single filter cartridges is not required

Chapter 2

Stade NPP PWR

RPV Internals Segmentation and Packing


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Dismantling Projects – Stade NPP PWRGeneral Information

Dismantling and packing of RPV Internals (2007-2009)

� Remote controlled underwater segmentation and packing

� Parallel dismantling on 3 locations

� Total mass of 85 tons

� Primary waste characterization

� Packing and conditioning for final storage

� Water purification


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Components to be Cut and Packed

Core Barrel with Upper Core Internals

Upper Core Internals

Core Barrel

Core Support Structure


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Pool Layout

Survey of the working area at Stade NPP

Mobile Aux.Bridge Storage Rack UCI

Storage Rack

Storage Cask

Water Purification System

Working Platform

Mobile Bridge withJib Cranes

RPV

Mobile Crane Bridge

Water Purification

SystemStorage cask

Baskets

LCI

Turn Table

Crosscut Saw

Water PotBaskets


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Dismantling and Cutting operationsin the Spent Fuel Pool

Crosscut Saw

Basket

Upper Core Internals

Interim Storage Rack

View at Support Columns and Upper Core Plate


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Cutting and Packing of Control Rod Guide Assemblies


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Loading of a MOSAIK Cask

Copyright by GNS

Copyright by GNS

Copyright by GNS

Copyright by GNS

Transport of the Cask into the Spent Fuel Pool

Positioning of the cask at the pool bottom

Loading of the Cask

Mounting of the Cask Cover

Chapter 3

Wuergassen NPP BWR

RPV and Internals Segmentationand Packing


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Dismantling Projects – Wuergassen NPP BWRGeneral Information

04/2006

12/2008

Order for dismantling of remaining RPV-internals

Project completion

02/2008

04/2010

Order for dismantling of cylindrical part of RPV

Project completion

10/2005

11/2006

Order for dismantling of cyclones of the steam separator

Project completion

05/2004

01/2005

Order for dismantling of hook bolts of the steam separator

Project completion

11/2003

12/2004

Order for dismantling of control rod guide tubes & jet pumps

Project completion

09/1995Application for shut down and decommissioning by phases


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Control Rod Guide Tubes & Jet Pumps

Order: 11/2003

On-site performance: 09 – 12/2004

Total material: 22 tons

Disposal in 200-l drums

Nibbling of cut tubes

Storage of cut pieces into drums

Cut through a jet pumpby band saw


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T-BoltsSegmentation & Disposal

� 40 pieces T-bolts (8 t)• Dismantling from the steam separator

• Cutting into segments by use of band saw equipment

• Disposal into 200-l drums

40pcs.; length 5,70 m


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Steam Separator Cyclones

Order receipt: 10/2005

Engineering, procurement of tools:

� 7 months

Cutting & packing:

� 7 months

Total mass :

� 35 tons

� Volume reduction:The cut segments were flattened down by an underwater press

� Disposal of cut segments into 200-l drums


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Remaining RPV Internals

Phase 2 - Arrangement

Sawing platform

Post processing platform

Additional cranes

HousingWorking platform

Order receipt: April 2006

End of project: Dec. 2008

Total mass: About 55 tons

On-site dismantling in two phases:

� Phase 1: Movable internals inside the set down pool (Dec. 2006 – Oct. 2007)

� Phase 2: Rigidly mounted internals in situ (Mar. – Dec. 2008)

Revolving stage on RPV flange with adhered post segmentation platform


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On-site ImpressionsDismantling of remaining RPV Internals

Loaded drum

WASS operation inside working tank

Sawing platform and mast

Final cutting of an ejector pump retainer

First cut on core shroud

Diffusor separator

Cutting of core spray tube by jigsaw

Postsegmentation of core spray tube

Loaded drum

Phase 1 Phase 2


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RPV DismantlingTechnical Data

RPV data� Total weight of cylindrical part: 320 Mg

� Height: 15m

� Cut segments: 252 pcs.

� Packing for final storage• Konrad Container Type II: 19• Konrad Container Type III: 10

Applied cutting techniques

� Water Abrasive Suspension Slicing

• Water pressure: 2000 bar• Jet diameter: 0,8 mm• Material thickness: 137 mm

• Cutting speed: 20mm/min

� Band saw (for RPV flange)

• Cutting height: 1100mm

• Flange thickness: 425 mm


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Overview on installed Infrastructure

• Shielding plate

• Complex RPV crane (handling tools and dismantled pieces)

• Rail systems and cranes for transportation (remote-operated)

• Rail system and cranes for container loading and conditioning (remote-operated)

►Installation of cranes and auxiliary equipment (e.g. steel structure) for transportation of RPV segments and packing into containers


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On-site ImpressionsRPV Dismantling

Vertical segmentation of RPV flange

Gripper removing RPV segment

Positioning of RPV segment for transport to container loading station

Packing of RPV segment into Konrad container


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Reference List

2007-2009GermanyStadeDismantling, cutting and packing of RPV internals12

2008-2010GermanyWuergassenDismantling, cutting and packing of RPV (cylindrical part)11

2006-2008GermanyWuergassenDismantling, cutting and packing of RPV internals10

2006GermanyWuergassenDismantling, cutting and packing of cyclones and stand pipes

9

2005GermanyWuergassenDismantling, cutting and packing of T-bolts8

2004GermanyWuergassenDismantling, cutting and packing of control rod guide tubes and jet pumps

7

2002SpainTrilloCutting of windows into the set down ring of RPV internals6

2000, 2001South AfricaKoeberg 1 and 2Dismantling of PTR tubes inside the fuel pool,Unblocking of a stuck fuel bundle,Placing of blind hole bores at the fuel pool liner

5

1993, 2000,2003

GermanyBiblis A and BDismantling and packing of core instrumentation assemblies

4

1993BelgiumBR 3 MolCutting of a thermal shield3

1997GermanyGundremmingen CSeparation of a core flux measuring casing2

1978 - 1985GermanySeveral plants Dismantling and cutting of commissioning instrumentations 1

YearCountryNP PlantActivityNr

Dismantling Projects


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Any reproduction, alteration, transmission to any third party or publication in whole or in part of this document and/or its content is prohibited unless AREVA has provided its prior and written consent.

This document and any information it contains shall not be used for any other purpose than the one for which they were provided. Legal action may be taken against any infringer and/or any person breaching the aforementioned obligations.

- End of Presentation -AREVA: Experience in Dismantling and Packing of Pressure Vessel and Core Internals

Jan Hendrik BruhnAREVA NP GmbH/ IBRZ-GVarna, June 10th 2010

areva: experience in internals - bulatom-bg.org 3/report... · areva: experience in dismantling and...

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