Research Reactor Decommissioning Demonstration Project (R²D²P) Workshop on ‘’Dismantling of the higher active parts of a research reactor’’

22 – 26 June 2015 Bucharest-Magurele, Romania

DECOMMISSIONING TECHNOLOGIES & FOR DISMANTLING OF IFIN-HH VVR-S NUCLEAR RESEARCH REACTOR

IDT-I Adrian ZORLIU Eng. Corneliu Petran The acquisition process

In Romania, the Law of Public Acquisition states that for every item you need to purchase, a public auction has to be organized. The company wanting to purchase a or an equipment has to fill in a data sheet/tender book. All the technical data must be specified on this document - the tool or the equipment should also meet some additional requirements such as warranty, service, spares, etc. Then the data sheet/tender book is officially published and the interested suppliers would send their offers. Every offer that entirely meets the specifications from the tender book will be accepted and then a public auction will be organized. In this purchase auction, the accepted bidders will send their offers price in a sealed envelope. Finally, all the participants (buyer and bidders) will gather in a meeting where the envelopes are open. The winner is declared to be the company who offers the smallest price for the given technical specifications of the data sheet/tender book.

The selection of dismantling technologies and tools

was made according to:

• Decommissioning strategy chosen for IFIN-HH VVR-s nuclear research reactor

• Recommendation of IAEA experts mission within the ROM/4/029 Project 2007 – Task 08

The equipment was supplied by: - IAEA under ROM/4/029 Project - Local authorized vendors

The following main aspects were taken into account:

- Reducing the generation of contaminated liquid wastes - Reducing the generation of radioactive airborne - Safety of installation and workers - Reducing the decommissioning time and costs - The use of conventional dismantling technologies and tools as simple as possible and if necessary to adapt these to the required particular tasks. - Use of non-exploding techniques for demolishing the reactor block - The moderate level of radioactive inventory specific to this type of research reactors

Based on the above consideration we choose the following types of mechanical cutting tools:

• Sabre machine, band saw machine, turning chisel machine and reciprocating saw for cutting activated and contaminated pipes. • Scissors, shears and diamond discs equipment for dismantling of metal structures and components. • Diamond wire saw, diamond disc, drilling machine, , chisel and rock splitter for demolishing the reactor block, the hot cells and other concrete structure. A. MECHANICAL TOOLS

1. Semi-Automatic Cutting Horizontal Band Sawing Machine - Proma BMSY 440 Technical data: • Cutting Al, Al alloys, non-ferrous metals, steel • Cutting pipes with diameters upon 440 mm, and objects with 640x440 mm • Can be operated remotely from 20 m distance

Used for: - Cutting the pipes resulted from the dismantling of the water transport system connection between the 30 cubic meter buffer tank and the 300 cubic meter tank at the Waste Treatment Plant. - Cutting of other pipes resulted from dismantling the primary cooling circuit of the reactor

Cutting the 108 mm diameter pipe

2. Pipe cutting machine using a turning chisel system – Proma MCA 6

Technical data: • Cutting pipes between 152 – 325 mm diameter • Can be operated remotely

Used for: - Cutting the pipes dismantled from the primary cooling circuit

3. Reciprocating Electric/Pneumatic Band Saw - Bosch Workers in the pumps room are cutting pipes connection to the heat exchanger from the primary cooling circuit.

4. Electrical Sabre Saw - Hilti WSR 1200 PE - Cutting small objects with diameters up to 100 mm.

5. Diamond Hollow – HILTI DD 200

Drilling operation in the reactor biological shield and the pumps room to take concrete sample for radiological analyses Using the Hilti DD 200 drilling machine on demolition the degasser biological shield 6. Hydraulic Rock Splitter – Darda C12N • Uses 5 cylinders to split concrete structures Picture from testing activities on a mock-up. Drilling with Hilti machine and using the rock splitter on a heavy concrete block.

7. Diamond Cutting Machine - Braun BWS

Provided with a mounting head that can use one of the following equipment: - a wall diamond saw blade BWS 15-H. There are three size available for the saw blade: 800, 1200 and 1500 mm diameter. The maximum cutting depth is 680 mm. - a 20 m wire diamond saw BWS8 for cutting heavy concrete structures With this equipment operators have made tests on a concrete mock-up.

8. Diamond Drilling Equipment – Braun DK 32 - The maximum core bit diameter is 480 mm Mock-up tests

Drilling operation with Braun DK 32 in the reactor biological shield around horizontal channel nr.9 to take samples for radiological analyses

9. Electro-Hydraulic Diamond Chain Saw – ICS 880 For cutting concrete structures. Mock-up tests

Using the ICS chain saw to finish the cuttings on the removal of a concrete block from the degasser biological shield

10. De Walt Equipment Demolition Hammer – De Walt D 25940 K Angular Grinder Abrasive Disc

De Walt – angular grinder and abrasive disc 11. Mobile Electro-hydraulic Scissors – Holmatro CU 4030 C GP - Used in decommissioning activities for cutting and dismantling of metal structures Cutting the fuel assembly rack

12. - N1000 - A tool for cutting small pieces from a metal structure

13. Cable Stripper Machine - For cables between 5 to 100 mm diameter B. REMOTE ROBOTICS Remote controlled electro-hydraulically demolition machine – BROKK 50 and BROKK 160 • Provided with the following tools: - Concrete crusher - Grapple - Steel - Scrabbler - Scissors

Mock – up tests with Brokk 50 using the concrete crusher tool The operator working with the remote control unit Installing the Brokk 160 on the top of reactor to cut the internal I&C components Using the Brokk 160 on the top of Reactor for cutting the control rods Remotely operation. One worker is operating the 10 t crane to lift the activated control rod, while the other one operates the Brokk machine to cut the rod in a shielded drum

C. PLASMA TORCH CUTTING TOOL Plasma torch equipment – Hypertherm Powermax 105

Dismantling the heat exchangers with plasma torch in the pumps room

D. Scarifying Equipment - Trelawny For wall, floor and corner

Scarifying the floor in the reactor Hall

• E. The cutting shop for activated and contaminated structures and components

• ModuCon Enclosure Assembly, made of UPVC material, easy to wash and decontaminate. • Comprise an air lock, a working room and a deconatamination room with shower. • Provided with a HEPA filtration system

F. Ventilation systems and dust cleaners

Mobile Filtration System with HEPA filter – Model 3 Industrial dust cleaners G. Compressed air supplier

Produces compressed dry air for pneumatic systems and tools Final considerations For all the equipment and tools presented here, there are issued: - Work procedures - Instructions for both radiological safety, industrial and health safety of workers. All workers: - are trained periodically to operate the dismantling equipment. - have license for operating the crane, hoists and other specific equipment • Thanks to the Romanian Government who provides the reactor decommissioning funds, the technical support and help from IAEA and the hard work of IFIN-HH Management Team we have acquired a large variety of tools and equipment that will help to the decommissioning of our nuclear research reactor in safety condition with no harm to the environment.

THE END

THANK YOU FOR YOU’RE PATIENCE