New Swedish regulations for clearance of materials, rooms, buildings and land NKS Seminar on Decommissioning of Nuclear Facilities 14-16 September 2010 Henrik Efraimsson Dep of Radioactive Materials henrik.efraimsson@ssm.se Henrik Efraimsson 2009-10-21
Contents Current regulations on clearance New regulations on clearance The nuclear industry handbook The homogeneity issue Other clearance options Closing remarks Henrik Efraimsson 2009-10-21
Current regulations on clearance Regulations for Nuclear Facilities (SSMFS 2008:39) Regulations for managament of non-nuclear radioactive waste (SSMFS 2008:50) Case by case-decisions after application by the licensee (compliance with 10 Sv concept required) Henrik Efraimsson 2009-10-21
New Regulations Clearance of materials, buildings and land areas – All licensed practices where radioactive materials are used or processed in view of their radioactive, fissile or fertile properties Will replace SSMFS 2008:39 Currently being notified to the EC Planned to enter into force in 2011 Henrik Efraimsson 2009-10-21
Principle for regulation History: Future: Possible contamination Handled without radiation due to the practice protection restrictions Control of compliance Henrik Efraimsson 2009-10-21
Requirements on the clearance process Can it be Correct measurement? cleaned? Competence Below clearance level? Can it be radioactive? Own decision Appropriate Judgement on clearance Judgement measurement Object of materials within standards Control Program Decision on - Methods own free use of - Scope rooms or building Documentation - Authorized persons of results - Quality Assurance - Documentation Application on Yearly clearance of n o report i Notification t a c room/building/ i l p p A land SSM Henrik Efraimsson 2009-10-21
Decommissioning requirement The licensee shall take all measures that are needed for clearance of rooms, buildings and land
No dilution before clearance Prohibited to dilute radioactively contaminated materials with the purpose of achieving clearance
Recommended measures before clearance Remove easily removable contamination Remove systems, equipment and components in order to facilitate decontamination and activity checks of the remaining structures
Activity concentration Clearance 1. Any material for free use levels (reuse, recycling, disposal) 2. Used oil for incineration, hazardous waste for disposal Surface Not applicable on tools and equipment that contamination are intended for further use after clearance All materials and objects 1. Free use 2. Demolition Activity in rooms Contaminated land areas and buildings
All materials Surface contamination and objects 40 kBq/m 2 ( ) 4 kBq/m 2 ( ) Mean value over 3 dm 2 Advice: Loose contamination < 10%
Any material for free use Levels according to EC recommendation RP 122, part 1 10000 1000 Activity 100 concentration SSMFS 10 Bq/g 2008:39 1 0,1 0,01 0,001
Used oil and hazardous waste for incineration or disposal Activity concentration 10 times higher levels than RP 122 part 1
Rooms and buildings Levels according to EC recommendation RP 113 10000000 10000000 1000000 1000000 100000 100000 Surface activity 10000 10000 kBq/m2 kBq/m2 1000 1000 100 100 10 10 1 1 0,1 0,1
The Swedish Nuclear Industry´s handbook for clearance - a common platform to meet the requirements Contents – Requirements – The clearance process – Radiological mapping – Methods and techniques for measurements – Routines and logistics – Quality assurance and documentation – Competence and education Henrik Efraimsson 2010-04-28
Application of clearance levels - the homogeneity issue
Inhomogeneous contamination of materials Mean value over maximum 1000 kg 3000 kg 1000 kg
Inhomogeneous contamination of building surfaces Mean value over each 1 m
Other clearance options SSM can specify other clearance levels on a case by case basis, if there are circumstances that reduce the risk for exposure Examples Clearance of ingots for remelting Clearance for disposal
Closing remarks Regulations and industry handbook developed in an extensive process with broad participation Expected to be a good basis for robust clearance procedures Clearance in a proper, reliable and transparent way, with effective authority supervision
Recommend
More recommend
