Decommissioning of the accelerator park INW from the Ghent ...€¦ · Decommissioning of the...

Decommissioning of the accelerator park INW

from the Ghent University Myriam Monsieurs, Isabelle Meirlaen, Hubert Thierens

Ghent University, Health Physics Department

Sven Boden, Luc Noynaert, Luc Ooms,

SCK•CEN, Dismantling & Decontamination Unit

Karel Strijckmans

Ghent University, Department of Analytical Chemistry

Mini-workshop “Radiological Characterization of Cyclotrons for Dismantling”, January 25th, 2016, BEL V, Anderlecht

Introduction

• Decommissioning plan: contains info about inventory,

estimation of amounts of waste,…

→ strategy, total cost assessment

• Important factor : degree of activation

→ radiological characterization

• SCK•CEN, Decommissioning & Decontamination Unit

→ inventory of all metal components

→ radiological characterization of concrete structure

of cyclotron

→ decommissioning plan & safety report

Mini-workshop “Radiological Characterization of Cyclotrons for Dismantling”, January 25th, 2016, BEL V, Anderlecht

Accelerator park

• Location of the accelerator park

• Installations to dismantle

Mini-workshop “Radiological Characterization of Cyclotrons for Dismantling”, January 25th, 2016, BEL V, Anderlecht

UZ Gent

E17

UGent-INW

AA Gent

Location in Ghent

Schelde

railroad

Bestralingsruimte (IIA)

Afvallokalen kl II

cyclotron (IIA)

LINAC’s en Van de

Graaf

Laboratoria (II en III)

Meetzone (kl II)

D/T generator

N8 N3

N4

Location on the INW-site

1. Cyclotron

Cyclotron CGR type 520

→ polemagnet ᴓ 120 cm, 28 t

→ multiparticle :

• p+ (2,5 - 24 MeV)

• 2H (3 - 14,5 MeV)

• 3He (6 - 32 MeV)

• α (10 - 29 MeV)

Cyclotron

Mini-workshop “Radiological Characterization of Cyclotrons for Dismantling”, January 25th, 2016, BEL V, Anderlecht

→ Operational: 1977 – 2006

• 7-10h/day

• 40-45 weeks/year

→ 1977 – 1982 : 3 beamlines

→ 1982 : + 3 beamlines & hotlab

→ Used for research in

radiochemistry

Cyclotron

Mini-workshop “Radiological Characterization of Cyclotrons for Dismantling”, January 25th, 2016, BEL V, Anderlecht

Kazemat:

Cyclotron CGR 520

Alveole 1:

1977 – 1982: PET → 11C

1979 – 1984: FNAA

1982 – 2006: CPAA

Alveole 2:

1982 – 2006: PIXE

Alveole 3:

1977 – 1982 (1 beamline): CPAA

1982 – 2006 (3 beamlines): isotope production → 11C, 18F, 15O

BetonBlokken

3,7 m

hoog

BetonBlokken

5,6m hoog

BetonBlokken

2 m hoog

100.046Alveole 1

100.047Alveole 2

100.048Alveole 3

100.038

Alveole 4

100.030Alveole 5

100.054Kazemat

kazemat

Alveole 1

Alveole 2

Alveole 3

Cyclotron

Mini-workshop “Radiological Characterization of Cyclotrons for Dismantling”, January 25th, 2016, BEL V, Anderlecht

Alveole 4: Isotope production → 81Rb/81mKr

Alveole 5: Neutron therapy unit

Mostly used for experimental

neutron irradiation.

Hotlab: preparation radiopharma

→ 6 hotcells and 4 fume hoods

BetonBlokken

3,7 m

hoog

BetonBlokken

5,6m hoog

BetonBlokken

2 m hoog

100.046Alveole 1

100.047Alveole 2

100.048Alveole 3

100.038

Alveole 4

100.030Alveole 5

100.054Kazemat

Cyclotron

2006: Final shutdown

Equipment → largely intact and still in place

Only small loose parts

and some peripheral

equipment

→ removed

Cyclotron

Mini-workshop “Radiological Characterization of Cyclotrons for Dismantling”, January 25th, 2016, BEL V, Anderlecht

Bestralingsruimte (IIA)

Afvallokalen kl II

cyclotron (IIA)

LINAC’s en Van de

Graaf

Laboratoria (II en III)

Meetzone (kl II)

D/T generator

N3

LINAC’s & Van de Graaff

2. 90 MeV LINAC

→ Operational: 1975 – 1995

• 60 000 h

• 30 – 70 MeV

→ Components:

• electron gun

• 2 accelerator sections

• Positronconvertor

• beam transportsystem

• peripheral equipment

90 MeV LINAC

Mini-workshop “Radiological Characterization of Cyclotrons for Dismantling”, January 25th, 2016, BEL V, Anderlecht

→ Used for: Nuclear Physics research

→ Today: disassembled

• (possibly) activated parts

→ stored

• peripheral equipment

→ removed

90 MeV LINAC

Mini-workshop “Radiological Characterization of Cyclotrons for Dismantling”, January 25th, 2016, BEL V, Anderlecht

15 MeV LINAC

Mini-workshop “Radiological Characterization of Cyclotrons for Dismantling”, January 25th, 2016, BEL V, Anderlecht

3. 15 MeV LINAC

→ Operational: 1986 – 2008

• 50 000 h

• max 10 MeV

→ Components:

• electron gun

• 2 accelerator sections

• beam transportsystem

• peripheral equipment

15 MeV LINAC

Mini-workshop “Radiological Characterization of Cyclotrons for Dismantling”, January 25th, 2016, BEL V, Anderlecht

→ Used for:

• before ‘97: Fundamental Nuclear Physics

research

• after ’95: Applied multidisciplinary research

→ Today: partially disassembled

• beam transport system → in place

• electron canon + 2 beamline sections →

stored

• peripheral equipment → removed

• shielding → re-used on site

Mini-workshop “Radiological Characterization of Cyclotrons for Dismantling”, January 25th, 2016, BEL V, Anderlecht

4. 2 MeV Van de Graaf accelerator

→ Operational: 03/12/1999

→ 22Na source was damaged

during first start-up of accelerator

→ Decontamination: 04/04/2000

→ Accelerator was never used again

→ Today: disassembled

• contaminated section → stored

• not contaminated parts → donated

to scientific history museum UGent

Van de Graaff

5. Other accelerator parts

→ 2 sections LINAC Rozier (UGent < 1975)

→ 2 sections IRMM

Other parts

Mini-workshop “Radiological Characterization of Cyclotrons for Dismantling”, January 25th, 2016, BEL V, Anderlecht

Bestralingsruimte (IIA)

Afvallokalen kl II

cyclotron (IIA)

LINAC’s en Van de

Graaf

Laboratoria (II en III)

Meetzone (kl II)

D/T generatorN4

D/T generator

6. 14 MeV Neutron generator type J (Sames) 2H particles accelerated up to 150 keV to a 3H target

→ quasi mono-energetic 14 MeV neutrons

Water-cooled 3H target (Nukem, D; 2,8 1011 Bq in 1970)

Neutron flux: 109 n cm-2

→ Operational: 1960 – 1980

→ Today:

• Largely intact

• Stored in place

Mini-workshop “Radiological Characterization of Cyclotrons for Dismantling”, January 25th, 2016, BEL V, Anderlecht

D/T generator

Radiological characterization of the UGent

cyclotron in view of its dismantling

Sven Boden & Luc Ooms (Dismantling & Decontamination Unit, SCK•CEN)

sven.boden@sckcen.be, luc.ooms@sckcen.be

Isabelle Meirlaen, Myriam Monsieurs, Hubert Thierens & Karel Strijckmans (UGent) isabelle.meirlaen@ugent.be, myriam.monsieurs@ugent.be, hubert.thierens@ugent.be, karel.strijckmans@ugent.be

Mini-workshop “Radiological Characterization of Cyclotrons for Dismantling”, January 25th, 2016, BEL V, Anderlecht