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2009-10-21 Henrik Efraimsson
2009-10-21 Henrik Efraimsson
New Swedish regulations for clearance of materials, rooms, buildings - - PowerPoint PPT Presentation
New Swedish regulations for clearance of materials, rooms, buildings - - PowerPoint PPT Presentation
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
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2009-10-21 Henrik Efraimsson
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)
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2009-10-21 Henrik Efraimsson
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
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2009-10-21 Henrik Efraimsson
Principle for regulation
History: Possible contamination due to the practice Future: Handled without radiation protection restrictions Control of compliance
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2009-10-21 Henrik Efraimsson
Object Appropriate measurement within standards Judgement Own decision
- n clearance
- f materials
Control Program
- Methods
- Scope
- Authorized persons
- Quality Assurance
- Documentation
Correct measurement? Below clearance level? Can it be radioactive? Can it be cleaned? Documentation
- f results
Competence Judgement Application on clearance of room/building/ land Decision on
- wn free use of
rooms or building
Requirements on the clearance process
SSM Notification Yearly report A p p l i c a t i
- n
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Decommissioning requirement
The licensee shall take all measures that are needed for clearance of rooms, buildings and land
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No dilution before clearance
Prohibited to dilute radioactively contaminated materials with the purpose
- f achieving clearance
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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
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Clearance levels
Activity concentration
- 1. Any material for free use
(reuse, recycling, disposal)
- 2. Used oil for incineration,
hazardous waste for disposal
Not applicable on tools and equipment that are intended for further use after clearance
- 1. Free use
- 2. Demolition
Activity in rooms and buildings Surface contamination
All materials and objects Contaminated land areas
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Surface contamination
40 kBq/m2 () 4 kBq/m2 () Mean value over 3 dm2 Advice: Loose contamination < 10%
All materials and objects
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Any material for free use
Levels according to EC recommendation RP 122, part 1
0,001 0,01 0,1 1 10 100 1000 10000
Bq/g
SSMFS 2008:39 Activity concentration
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Used oil and hazardous waste for incineration or disposal
10 times higher levels than RP 122 part 1
Activity concentration
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Rooms and buildings
Levels according to EC recommendation RP 113
0,1 1 10 100 1000 10000 100000 1000000 10000000 kBq/m2 0,1 1 10 100 1000 10000 100000 1000000 10000000 kBq/m2
Surface activity
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2010-04-28 Henrik Efraimsson
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
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Application of clearance levels
- the homogeneity issue
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Inhomogeneous contamination of materials
Mean value over maximum 1000 kg
3000 kg 1000 kg
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Inhomogeneous contamination of building surfaces
Mean value over each 1 m
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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
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