New Swedish regulations for clearance of materials, rooms, buildings and land

Transcription

1 New Swedish regulations for clearance of materials, rooms, buildings and land NKS Seminar on Decommissioning of Nuclear Facilities September 2010 Henrik Efraimsson Dep of Radioactive Materials Henrik Efraimsson

2 Contents Current regulations on clearance New regulations on clearance The nuclear industry handbook The homogeneity issue Other clearance options Closing remarks Henrik Efraimsson

3 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

4 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

5 Principle for regulation History: Possible contamination due to the practice Future: Handled without radiation protection restrictions Control of compliance Henrik Efraimsson

6 Can it be cleaned? Object Requirements on the clearance process Can it be radioactive? Judgement Competence Appropriate measurement within standards Correct measurement? Below clearance level? Judgement Own decision on clearance of materials Control Program - Methods - Scope - Authorized persons - Quality Assurance - Documentation Henrik Efraimsson Notification Documentation of results Yearly report SSM Application Decision on own free use of rooms or building Application on clearance of room/building/ land

7 Decommissioning requirement The licensee shall take all measures that are needed for clearance of rooms, buildings and land

8 No dilution before clearance Prohibited to dilute radioactively contaminated materials with the purpose of achieving clearance

9 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

10 Clearance levels Activity concentration 1. Any material for free use (reuse, recycling, disposal) Surface contamination All materials and objects 1. Free use 2. Demolition Activity in rooms and buildings 2. Used oil for incineration, hazardous waste for disposal Not applicable on tools and equipment that are intended for further use after clearance Contaminated land areas

11 Surface contamination All materials and objects 40 kbq/m 2 ( ) 4 kbq/m 2 ( ) Mean value over 3 dm 2 Advice: Loose contamination < 10%

12 10000 Any material for free use Levels according to EC recommendation RP 122, part Activity concentration Bq/g ,1 SSMFS 2008:39 0,01 0,001

13 Used oil and hazardous waste for incineration or disposal Activity concentration 10 times higher levels than RP 122 part 1

14 Rooms and buildings Levels according to EC recommendation RP Surface activity kbq/m ,1

15 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

16 Application of clearance levels - the homogeneity issue

17 Inhomogeneous contamination of materials Mean value over maximum 1000 kg 3000 kg 1000 kg

18 Inhomogeneous contamination of building surfaces Mean value over each 1 m

19 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

20 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