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

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 ROBERT 04/19/2017

LURE: A Second Generation Synchrotron Plant Building of the first part of 2/1956 - 8/1962 the LINAC Building of the second 4/1965 - 8/1968 part of the LINAC First beam in CLIO FEL First beam in DCI 3/1977 6/1992 2003 1956 1960 1964 1968 1972 1976 1980 1984 1988 1992 1996 2000 4/1965 5/1987 12/2003 First beam in ACO First beam in collision ring Super ACO LINAC, Super ACO and DCI stopped 3 RadSynch'17 -NSRRC, Hsinchu - Decommissioning of the LURE Synchrotron - J-M HORODYNSKI/P ROBERT 04/19/2017

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

Goals of the Decommissioning Project • LINAC, Super ACO and DCI stopped • ACO as a museum • CLIO (FEL) running Initial state • LINAC, Super ACO and DCI decommissioned • ACO as a museum • CLIO (FEL) running Final State • PHIL (electron LINAC, 9 MeV) running 5 RadSynch'17 -NSRRC, Hsinchu - Decommissioning of the LURE Synchrotron - J-M HORODYNSKI/P ROBERT 04/19/2017

• Dismantlling of non-radioactive parts : • modulators and oils contaminated with PCB • abestos 2004-2008 • 2006 : partial dismantling of the Super-ACO ring for material transfers towards research centers Planning of Dismantling Works for the LURE • Files to obtain license to begin dismantlingof radioactive parts (Ministerialdecree) 2008-2009 Synchrotron Plant Non-radioactive parts were dismantled first • Dismantling of radioactive parts : Super ACO, DCI and LINAC • Elimination of radioactive waste Licensee need to be delivered to 2009 - 2010 dismantle radioactive parts Declassification only if final state previously declared is reached • Files to obtain declassificationof the INB106 2010-2015 Availablein the incoming paper RadSynch'17 -NSRRC, Hsinchu - Decommissioning of the LURE Synchrotron - J-M HORODYNSKI/P ROBERT 04/19/2017 6

Radiation Protection During and After the Decommissioning Decommissioning of the LURE Synchrotron RadSynch'17 -NSRRC, Hsinchu - Decommissioning of the LURE Synchrotron - J-M HORODYNSKI/P ROBERT 04/19/2017 7

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

Radiological Assessmements of DecommissioningWorks RadSynch'17 -NSRRC, Hsinchu - Decommissioning of the LURE Synchrotron - J-M HORODYNSKI/P ROBERT 04/19/2017 9

Availablein the incoming paper RadSynch'17 -NSRRC, Hsinchu - Decommissioning of the LURE Synchrotron - J-M HORODYNSKI/P ROBERT 04/19/2017 10

Specific Activity of Concrete and Activation WitnessesAlong the Electron Part of the LINAC and the Convertor Area 1E+02 1E+01 Variation of the activation 1E+00 along the LINAC 0 20 40 60 80 100 120 140 The level of activation do not vary Bq.g -1 1E-01 linearly with the beam energy. -Radiation protection: dose rate map 1E-02 - Radioactive waste management: activation level depending on various 1E-03 parameters CONVERTOR 1E-04 AREA Meter (0: electron gun) Aluminum - Stainless Steel - Concrete - RadSynch'17 -NSRRC, Hsinchu - Decommissioning of the LURE Synchrotron - J-M HORODYNSKI/P ROBERT 04/19/2017 11

Radiation Protection – Optimization using planning • 1st Phase: Super ACO (lowest radiological risks) • 2 nd 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) RadSynch'17 -NSRRC, Hsinchu - Decommissioning of the LURE Synchrotron - J-M HORODYNSKI/P ROBERT 04/19/2017 12

Radiation Protection during the Decommissioning Phase Worker H p (10) (µSv) H p (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…) RadSynch'17 -NSRRC, Hsinchu - Decommissioning of the LURE Synchrotron - J-M HORODYNSKI/P ROBERT 04/19/2017 13

Complete Decontamination of the Building Walls ? • The choice must be based on: • Potential radiological impact on public and environment (decontamination, on-site use or site demolition) • Technical constraints • Financial costs 14 RadSynch'17 -NSRRC, Hsinchu - Decommissioning of the LURE Synchrotron - J-M HORODYNSKI/P ROBERT 04/19/2017

Specific Activity vs Depth in Concrete in Convertor Areas of the LURE LINAC 1.2 LURE – 1 Radiological Risk SPECIFIC ACTIVITY (BQ.G-1) 0.8 Assessment 0.6 0.4 LINAC – Convertor areas – Concrete activation 0.2 0 0-5 cm 5-10 cm 10-15 cm 15-20 cm 25-30 cm 30-35 cm DEPTH IN CONCRETE R5 Convertor Old R8 Convertor RadSynch'17 -NSRRC, Hsinchu - Decommissioning of the LURE Synchrotron - J-M HORODYNSKI/P ROBERT 04/19/2017 15

LURE - Radiological Impact Assessment: Walls Decontamination not made • Radiological impact were assessed if LURE most activated walls were not decontaminated Efficient dose Adults (µSv) Infants 0-1 • Worst case: use of the building for private year (µSv) purpose • From 2020, maximum efficient dose 2010 1,56 e 3 1,98 e 3 integrated during one year will be inferior to 1 2020 7,15 e 2 9,08 e 2 mSv • According to the radiological impact 3,74 e 2 4,75 e 2 2030 assessments and technical constraints, walls of the convertor area were not decontaminated. RadSynch'17 -NSRRC, Hsinchu - Decommissioning of the LURE Synchrotron - J-M HORODYNSKI/P ROBERT 04/19/2017 16

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

Radioactive Waste Management Decommissioning of the LURE Synchrotron RadSynch'17 -NSRRC, Hsinchu - Decommissioning of the LURE Synchrotron - J-M HORODYNSKI/P ROBERT 04/19/2017 18

LURE Decommissioning – Radioactive Waste Management • European regulations define free-release thresholds for activated waste • French regulations do not apply it: Radioactive waste management based on 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) 19 RadSynch'17 -NSRRC, Hsinchu - Decommissioning of the LURE Synchrotron - J-M HORODYNSKI/P ROBERT 04/19/2017

Radioactive Waste Management Process Radioactive Waste Dissassembling - Dose rate Conditionning Zoning Production measurements Radiological Applications files Transport to characterization for ANDRA ANDRA disposal (Gamma disposal spectrocopy) 20 RadSynch'17 -NSRRC, Hsinchu - Decommissioning of the LURE Synchrotron - J-M HORODYNSKI/P ROBERT 04/19/2017

Radioactive Waste: Packaging Two types of packaging were used: • ISO 20-feet half-height container. • Unit pieces. RadSynch'17 -NSRRC, Hsinchu - Decommissioning of the LURE Synchrotron - J-M HORODYNSKI/P ROBERT 04/19/2017 21

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 RadSynch'17 -NSRRC, Hsinchu - Decommissioning of the LURE Synchrotron - J-M HORODYNSKI/P ROBERT 04/19/2017 22

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 RadSynch'17 -NSRRC, Hsinchu - Decommissioning of the LURE Synchrotron - J-M HORODYNSKI/P ROBERT 04/19/2017 23

Radioactive Waste: Numbers and Feedbacks ISO 20 feet half- Volume (m 3 ) Weight (tons) Unit pieces height Phase 1 121 99 4 8 Super ACO Phase 2 642 294 8 98 DCI Phase 3 261 430 21 8 LINAC Phase 4 35 28 4 0 Convertor Total 1059 851 37 114 24 RadSynch'17 -NSRRC, Hsinchu - Decommissioning of the LURE Synchrotron - J-M HORODYNSKI/P ROBERT 04/19/2017