Wylfa 2013 FINAL Front Cover

Cefas contract report C6028 Radiological Habits Survey: Wylfa, 2013 2014 Environment Report RL 03/14 This page has been intentionally left blank Cefas Document Control Radiological Habits Survey: Wylfa, 2013 Food Standards Agency, Environment Agency and Office for Nuclear Submitted to: Regulation. Date submitted: 27th June 2014 Project Manager: Fiona Clyne Report compiled by: Chris Garrod Quality control by: John Hunt Approved by & date: Bill Camplin, 26th June 2014 Version: Final Version Control History Author Date Comment Version Sent to FSA, EA and Chris Garrod 28th February 2014 Draft 1 ONR for comments. Revised and sent to Chris Garrod 12th May 2014 FSA, EA and ONR for Draft 2 comments. All amendments Chris Garrod 27th June 2014 Final completed. This page has been intentionally left blank Environment Report RL 03/14 Final report Radiological Habits Survey: Wylfa, 2013 C.J. Garrod, F.J. Clyne and G.P. Papworth 2014 The work described in this report was carried out under contract to the Environment Agency, the Food Standards Agency and the Health and Safety Executive. Cefas contract C6028 FSA Project FS131008 This report should be cited as: Garrod, C.J., Clyne, F.J. and Papworth, G.P., 2014. Radiological Habits Survey: Wylfa, 2013. RL 03/14. Cefas, Lowestoft A copy can be obtained by downloading from the Cefas website: www.cefas.defra.gov.uk © Crown copyright, 2014 Page 2 of 70 Radiological Habits Survey: Wylfa, 2013 CONTENTS SUMMARY .............................................................................................................................................. 7 1 INTRODUCTION ........................................................................................................................... 12 1.1 Regulatory framework ........................................................................................................... 12 1.2 Radiological protection framework ........................................................................................ 13 2 THE SURVEY ............................................................................................................................... 15 2.1 Site activity ............................................................................................................................ 15 2.2 Survey objectives .................................................................................................................. 15 2.3 Survey areas ......................................................................................................................... 16 Figure 1. The Wylfa aquatic survey area ...................................................................................... 17 Figure 2. The Wylfa terrestrial and direct radiation survey areas ................................................. 18 2.4 Conduct of the survey ........................................................................................................... 19 3 METHODS FOR DATA ANALYSIS ............................................................................................. 22 3.1 Data recording and presentation ........................................................................................... 22 3.2 Data conversion .................................................................................................................... 22 3.3 Rounding and grouping of data ............................................................................................. 22 Table A. Names of age groups and range of ages within each age group. .................................. 23 3.4 Approaches for the identification of high rates ...................................................................... 24 3.5 Profiles of habits survey data for use in total dose assessments ......................................... 25 3.6 Data quality ........................................................................................................................... 25 4 AQUATIC RADIATION PATHWAYS ........................................................................................... 27 4.1 Aquatic survey area .............................................................................................................. 27 Figure 3. Hen Borth....................................................................................................................... 28 Figure 4. Cemlyn Bay ................................................................................................................... 29 Figure 5. The outfall at Porth Wnal ............................................................................................... 30 Figure 6. Cemaes ......................................................................................................................... 31 Figure 7. The brickworks at Porth Wen ........................................................................................ 32 Figure 8. Anglers on the rocks at Bull Bay ................................................................................... 33 Figure 9. The harbour breakwater at Amlwch .............................................................................. 34 Figure 10. Porth Eilian .................................................................................................................. 35 4.2 Commercial fisheries ............................................................................................................. 35 4.3 Destination of seafood originating from the aquatic survey area .......................................... 36 4.4 Hobby fishing, angling and non-commercial shellfish collecting. .......................................... 36 4.5 Wildfowling ............................................................................................................................ 36 4.6 Other pathways ..................................................................................................................... 37 4.7 Food consumption data ......................................................................................................... 37 Table B. Summary of adults’ consumption rates of foods from the aquatic survey area .............. 38 Table C. Summary of children’s consumption rates of foods from the aquatic survey area ......... 39 4.8 Intertidal occupancy .............................................................................................................. 39 Table D. Summary of adults’ intertidal occupancy rates .............................................................. 40 Table E. Summary of children’s and infants’ intertidal occupancy rates ...................................... 41 4.9 Gamma dose rate measurements......................................................................................... 41 4.10 Handling of fishing gear and sediment .................................................................................. 42 Table F. Summary of adults’ handling rates of fishing gear and sediment................................... 42 Table G. Summary of children’s handling rates of sediment ........................................................ 43 4.11 Water based activities ........................................................................................................... 43 5 TERRESTRIAL RADIATION PATHWAYS .................................................................................. 45 5.1 Terrestrial survey area .......................................................................................................... 45 5.2 Destination of food originating from the terrestrial survey area ............................................ 47 5.3 The potential transfer of contamination off-site by wildlife .................................................... 47 5.4 Food consumption data ......................................................................................................... 47 Table H. Summary of adults’ consumption rates of foods from the terrestrial survey area ........... 48 Page 3 of 70 CONTENTS Table I. Summary of children’s and infants’ consumption rates of foods from the terrestrial survey area ................................................................................................................................................ 49 6 DIRECT RADIATION PATHWAYS .............................................................................................. 50 6.1 Direct radiation survey area .................................................................................................. 50 6.2 Residential activities .............................................................................................................. 51 6.3 Leisure activities .................................................................................................................... 51 6.4 Commercial activities ............................................................................................................ 51 6.5 Occupancy rates ................................................................................................................... 52 Table J. Summary of direct radiation occupancy rates................................................................. 52 6.6 Gamma dose rate measurements......................................................................................... 53 7 USES OF HABITS DATA FOR DOSE ASSESSMENTS ............................................................. 54 7.1 Combined pathways .............................................................................................................

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