Decommissioning of the LURE Synchrotron RadSynch 17 NSRRC, - - PowerPoint PPT Presentation

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Decommissioning of the LURE Synchrotron RadSynch 17 NSRRC, - - PowerPoint PPT Presentation

Oct 17, 2022 538 likes •885 views

Decommissioning of the LURE Synchrotron RadSynch 17 NSRRC, Hsinchu, Taiwan April 19-22, 2017 Jean-Michel HORODYNSKI Pierre ROBERT Summary 2 RadSynch'17 -NSRRC, Hsinchu - Decommissioning of the LURE Synchrotron - J-M HORODYNSKI/P

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Decommissioning of the LURE Synchrotron

RadSynch ’17 – NSRRC, Hsinchu, Taiwan –April 19-22, 2017 Jean-Michel HORODYNSKI – Pierre ROBERT

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Summary

04/19/2017 RadSynch'17 -NSRRC, Hsinchu - Decommissioning of the LURE Synchrotron - J-M HORODYNSKI/P ROBERT 2

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LURE: A Second Generation Synchrotron Plant

2003

1956 1960 1964 1968 1972 1976 1980 1984 1988 1992 1996 2000

First beam in DCI

3/1977

First beam in CLIO FEL

6/1992

First beam in ACO collision ring

4/1965

First beam in Super ACO

5/1987

LINAC, Super ACO and DCI stopped

12/2003 2/1956 - 8/1962

Building of the first part of the LINAC Building of the second part of the LINAC

4/1965 - 8/1968 04/19/2017 RadSynch'17 -NSRRC, Hsinchu - Decommissioning of the LURE Synchrotron - J-M HORODYNSKI/P ROBERT 3

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Map of the LURE Synchrotron

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Goals of the Decommissioning Project

Initial state

  • LINAC, Super ACO and DCI stopped
  • ACO as a museum
  • CLIO (FEL) running

Final State

  • LINAC, Super ACO and DCI decommissioned
  • ACO as a museum
  • CLIO (FEL) running
  • PHIL (electron LINAC, 9 MeV) running

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Planning of Dismantling Works for the LURE Synchrotron Plant

Non-radioactive parts were dismantled first Licensee need to be delivered to dismantle radioactive parts Declassification only if final state previously declared is reached

2004-2008

  • Dismantlling of non-radioactive parts :
  • modulators and oils contaminated with PCB
  • abestos
  • 2006 : partial dismantling of the Super-ACO ring for material transfers towards research centers

2008-2009

  • Files to obtain license to begin dismantlingof radioactive parts (Ministerialdecree)

2009 - 2010

  • Dismantling of radioactive parts : Super ACO, DCI and LINAC
  • Elimination of radioactive waste

2010-2015

  • Files to obtain declassificationof the INB106

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Availablein the incoming paper

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Radiation Protection During and After the Decommissioning

Decommissioning of the LURE Synchrotron

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Radiation Protection during the LURE Decommissioning –Tools and Methodology

  • Risk management is based on its assessment and continuous improvement.
  • Radiation protection assessments of the decommissioning work
  • History of the exploitation (many years of exploitation => many changes)
  • Knowledge of the beam physics (identification of beam losses)
  • Radiological measurements (in-situ or on samples)
  • Numerical tools (Monte-Carlo/Deterministic codes)

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Radiological Assessmements of DecommissioningWorks

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Availablein the incoming paper

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Variation of the activation along the LINAC

The level of activation do not vary linearly with the beam energy.

  • Radiation protection: dose rate map
  • Radioactive waste management:

activation level depending on various parameters

1E-04 1E-03 1E-02 1E-01 1E+00 1E+01 1E+02 20 40 60 80 100 120 140

Bq.g-1 Meter (0: electron gun)

Specific Activity of Concrete and Activation WitnessesAlong the Electron Part of the LINAC and the Convertor Area

Aluminum - Stainless Steel - Concrete -

CONVERTOR AREA

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Radiation Protection – Optimization using planning

  • 1st Phase: Super ACO (lowest radiological risks)
  • 2nd phase: DCI (low radiological risks, seperated building)
  • 3rd phase: LINAC (medium radiological risks)
  • 4th phase: Convetor Area (highest radiological risks, area seperated from the LINAC

gallery)

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Radiation Protection during the Decommissioning Phase

Worker Hp(10) (µSv) Hp(0,07) Time during active dosimeter was used 1 19 36 9 h 04 min 2 7 32 9 h 03 min 3 13 44 8 h 22 min 4 24 51 12 h 13 min

  • Above: individual dosimetry( operational dosimeter) results during the disassembly of

the convertor (task exposing to the highest level of radiation)

  • Actual collective dose for the whole phase: 1 mSv.man
  • Internal exposure: no contamination and cutting works stricly limited and done with

dustless tools (saber-saw, pipe-cutter…)

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Complete Decontamination

  • f the Building Walls ?
  • The choice must be based on:
  • Potential radiological impact on public and environment (decontamination, on-site use
  • r site demolition)
  • Technical constraints
  • Financial costs

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LURE – Radiological Risk Assessment

LINAC – Convertor areas – Concrete activation

0.2 0.4 0.6 0.8 1 1.2 0-5 cm 5-10 cm 10-15 cm 15-20 cm 25-30 cm 30-35 cm SPECIFIC ACTIVITY (BQ.G-1) DEPTH IN CONCRETE

Specific Activity vs Depth in Concrete in Convertor Areas of the LURE LINAC

R5 Convertor Old R8 Convertor

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LURE - Radiological Impact Assessment: Walls Decontamination not made

  • Radiological impact were assessed if LURE

most activated walls were not decontaminated

  • Worst case: use of the building for private

purpose

  • From 2020, maximum efficient dose

integrated during one year will be inferior to 1 mSv

  • According to the radiological impact

assessments and technical constraints, walls of the convertor area were not decontaminated. Efficient dose Adults (µSv) Infants 0-1 year (µSv) 2010 1,56e3 1,98e3 2020 7,15e2 9,08e2 2030 3,74e2 4,75e2

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LURE Decommissioning – Final State

A minimal period survey of the area has been established, until 2020, where access are strictly restricted and works which may alter the walls are strictly forbidden. Since December 2015, LURE synchrotron is declassified

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Radioactive Waste Management

Decommissioning of the LURE Synchrotron

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LURE Decommissioning – Radioactive Waste Management

  • European regulations define free-release thresholds for activated waste
  • French regulations do not apply it: Radioactive waste management based
  • n a Waste radioactive Zoning approach
  • Identification of areas where radioactive waste may be produced: Radioactive Waste

Zoning

  • Definition of VLLW (Very Low-LevelWaste) category and availability of a final disposal

center (Cires, ANDRA)

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Radioactive Waste Management Process

Radioactive Waste Zoning Dissassembling - Production Dose rate measurements Conditionning Radiological characterization (Gamma spectrocopy) Applications files for ANDRA disposal Transport to ANDRA disposal

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Radioactive Waste: Packaging

Two types of packaging were used:

  • ISO 20-feet half-height

container.

  • Unit pieces.

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Radioactive Waste: Packaging

ISO 20-feet half-height container

  • Filling optimized to reduce

void

  • Empty parts must be arrange

to ease sand filling in the disposal

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Radioactive Waste: Packaging

Unit pieces

  • Parts that can not be placed in a

standard packaging

  • Weights between 100 kg to 25

tons

  • Handling parts or furnitures

available

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Radioactive Waste: Numbers and Feedbacks

Weight (tons) Volume (m3) ISO 20 feet half- height Unit pieces Phase 1 Super ACO 121 99 4 8 Phase 2 DCI 642 294 8 98 Phase 3 LINAC 261 430 21 8 Phase 4 Convertor 35 28 4 Total 1059 851 37 114

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Feedbacks for Next Synchrotron Decommissioning

  • Design phase
  • Reduce the amount of potential radioactive waste: no electronic devices near the

machine, use of concrete with a low level of Europium is needed…

  • Design accelerator parts reducing needs of cutting process for future dismantling

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Feedbacks for Next Synchrotron Decommissioning

  • Exploitation phase
  • Recording of every changes, events on the installations (machines and building) is

mandatory →QA plan

  • Knowledge of beam losses (localisation, levels…): Dose rate measurements, activation

samples, beam loss monitoring…

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Feedbacks for Next Synchrotron Decommissioning

  • Pre-decommissioning phase
  • Definition of the type and the composition of the project team: knowledge of the

installation, new skills, technical and administrative jobs (Safety, radiation protection, IT, financials…)

  • Critical risks for planning: time for application files with national authority following

local regulations (about half of the time dedicated to these tasks for LURE decommissioning)

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Feedbacks for Next Synchrotron Decommissioning

  • Decommissioning phase
  • Radiological risk assessment:
  • Localization of the critical area regarding external exposure risks
  • Optimization of the radiological risks: planning, shielding, methods…
  • Radiation protection team is a key element of the project team
  • Reusing of existing building for scientific purposes is a way to improve environment

impact of our scientific tools.

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iRSD Expertise and Consulting on Radiation Protection, Radioactive Waste Management, Safety and Decommissioning

  • CNRS unit dedicated to expertise and consulting for research nuclear plant:

accelerators, radioactive sources, X-ray generators…

  • Radiation Protection: Measurements, Management, Monte-Carlo code…
  • Safety: Design of interlocks system for accelerators, X-ray generators…
  • Decommissioning: Planning, Financial assessments…

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iRSD Expertise and Consulting on Radiation Protection, Radioactive Waste Management, Safety and Decommissioning

  • References:
  • SOLEIL Synchrotron: Financial assessment of the

decommissioning; Assessment of concrete activation using Monte-Carlo code

  • CERN: Review of the Radioactive Waste Management
  • ThomX (production of X-rays by ICS, electron

accelerators): Shielding design, radiological assessment, activation assessment, radioactive waste management plan, interlocks system…

  • Cilex – Apollon (High-Power laser (1-10 PW) on solid or

plasma targets): review of interlocks system and radiation protection application files.

  • www.irsd.cnrs.fr/en

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