Annual Report for 2010/11 and Forward Programme - Sellafield Ltd

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SSEM/2011/4730 June 2011Excess Beta-rich Activity1Summary (all beta-rich)Evolution 2 SynergyTotal number 26 2No. of particles 25 2No. of stones 2 0 0Particle Mean 90 Sr 3 3.82E+03 Bq Not AvailableParticle Max. 90 Sr 3 1.47E+04 Bq Not AvailableParticle Min. 90 Sr 3 2.33E+02 Bq Not AvailableParticle Mean 137 Cs 8.33E+03 Bq 4.05E+03 BqParticle Max. 137 Cs 2.72E+04 Bq 4.39E+03 BqParticle Min. 137 Cs 3.08E+03 Bq 3.70E+03 BqParticle Mean 137 Cs/ 90 Sr ratio 4.4 Not AvailableParticle Max. 137 Cs/ 90 Sr ratio 23.2 Not AvailableParticle Max. 137 Cs/ 90 Sr ratio 0.6 Not Available1. Averages and minimum values include reported limit of detection values.2. One granite chip (most probably from the adjacent railway bed) was initially identified as excessbeta but was later categorised as naturally occurring material based on the 226 Ra activity.3. Evolution 2 finds based on 90 Sr and 137 Cs Serco analysis results from 25 particles categorised asexcess beta-rich.The above find categorisation provides a structure for reporting the key findings from theSellafield Ltd analysis, as follows:Using the size categories the population of particle and stone finds can be placed into tworeservoirs; the first being the area of beach down to low tide and the second being the areabelow the low tide line (generically called sub-sea). There is an interchange between thesereservoirs that depends on a complex combination of factors and is the subject of the subseainvestigation. A visual description of the whole population of finds, with their componentparts, is represented by areas in Figure 3.11 below. In this diagram the beach particles andstones areas and their corresponding sub-sea areas are roughly based on the finds found todate and an assumption that the interchange rates between beach and sub-sea for particlesand stones is the same. This is a starting point to help visualise the find populations andweaknesses with respect to a representative sampling programme and lack of knowledge ofthe beach to sub-sea interchange rates are being addressed.© Nuclear Decommissioning Authority 2011. 37
SSEM/2011/4730 June 2011Find Population438 stones recoveredfrom November 2006 to31/03/2011795 particles recoveredfrom November 2006to 31/03/2011Beach particlepopulationBeachStonespopulationSub-sea particlepopulationSub-seaStonespopulationFigure 3.11. Diagram Representing Find Population numberIn a similar way to the whole population, the beach particle population is represented inFigure 3.12 below. The areas are again an approximate representation of the relativepopulation sizes for the particle categories and are based on particles found to date. Theuncertainty in the relative population sizes will again depend on how representative thesampling programme is for the particle population.Beach Particle Population514 alpha-rich particlesrecovered fromNovember 2006 to31/03/2011Alpha-rich particlepopulation11 60 Co-rich particlesrecovered fromNovember 2006 to31/03/201160 Co-richparticlepopulation270 beta-rich particlesrecovered fromNovember 2006 to31/03/2011Beta-rich particlepopulationExcess beta-richpopulationFigure 3.12. Radiological Classification in the Find Population27 Excess beta-richparticles recovered fromNovember 2006 to31/03/2011© Nuclear Decommissioning Authority 2011. 38
Page 1 and 2: Particles in the EnvironmentAnnual
Page 3 and 4: SSEM/2011/4730 June 2011ContentsPur
Page 5 and 6: SSEM/2011/4730 June 2011List of Tab
Page 7 and 8: SSEM/2011/4730 June 20111. Introduc
Page 9 and 10: SSEM/2011/4730 June 2011Figure 2.1.
Page 11 and 12: SSEM/2011/4730 June 2011In August 2
Page 13 and 14: SSEM/2011/4730 June 20112.3.4 Find
Page 15 and 16: SSEM/2011/4730 June 2011as well as
Page 17 and 18: SSEM/2011/4730 June 2011The monitor
Page 19 and 20: SSEM/2011/4730 June 2011(Field Inst
Page 25 and 26: SSEM/2011/4730 June 2011number of f
Page 27 and 28: SSEM/2011/4730 June 20114.5004.000F
Page 29 and 30: SSEM/2011/4730 June 2011Table 3.5.
Page 33 and 34: SSEM/2011/4730 June 20113.1.5 Risks
Page 35 and 36: SSEM/2011/4730 June 2011presence of
Page 37: SSEM/2011/4730 June 2011Beta-rich A
Page 41 and 42: SSEM/2011/4730 June 2011Log Am241 A
Page 43 and 44: SSEM/2011/4730 June 2011Beach Find
Page 45 and 46: SSEM/2011/4730 June 2011Log Pu239 A
Page 47 and 48: SSEM/2011/4730 June 2011Figure 3.22
Page 51 and 52: 2.52.72.93.13.33.53.73.94.14.34.54.
Page 53 and 54: SSEM/2011/4730 June 2011In summary,
Page 55 and 56: SSEM/2011/4730 June 2011particles h
Page 57 and 58: SSEM/2011/4730 June 2011• Boron,
Page 61 and 62: SSEM/2011/4730 June 2011Recommendat
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Page 65 and 66: SSEM/2011/4730 June 2011homogeneous
Page 67 and 68: SSEM/2011/4730 June 2011[the Sellaf
Page 69 and 70: SSEM/2011/4730 June 2011Figure 3.33
Page 71 and 72: SSEM/2011/4730 June 2011 © Nuclea
Page 73 and 74: SSEM/2011/4730 June 2011 © Nucle
Page 75 and 76: SSEM/2011/4730 June 2011The finding
Page 77 and 78: SSEM/2011/4730 June 2011Communicati
Page 79 and 80: SSEM/2011/4730 June 20115. Health R
Page 81 and 82: SSEM/2011/4730 June 2011The numbers
Page 83 and 84: SSEM/2011/4730 June 2011wear gloves
Page 85 and 86: SSEM/2011/4730 June 20116. Aims and
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SSEM/2011/4730 June 20116.5 Primary
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SSEM/2011/4730 June 20113. Where ar
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SSEM/2011/4730 June 20115. What is
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SSEM/2011/4730 June 2011Fundamental
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SSEM/2011/4730 June 2011size and wi
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SSEM/2011/4730 June 201130 May Drig
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SSEM/2011/4730 June 2011Figure 7.2.
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SSEM/2011/4730 June 20117.2 Applica
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SSEM/2011/4730 June 20117.2.3 Consi
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SSEM/2011/4730 June 20117.3.2 DSRL
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SSEM/2011/4730 June 2011contract mo
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SSEM/2011/4730 June 2011From 2008/0
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ID WBS Task Name Duration Start Fin
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SSEM/2011/4730 June 2011Hackney PD,
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SSEM/2011/4730 June 2011Appendix 12
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Harrington monitoring extent and as
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Whitehaven North/Harbour monitoring
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Nethertown monitoring extent for 20
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Drigg monitoring extent and associa
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Contents1. Introduction ...........
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Figure 1 - Swath bathymetry of Scro
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Figures 4 to 6 show the same data w
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3.2 Options for acquiring new bathy
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3.3 Interpretation of gross geomorp
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Head, shows a marked northerly sedi
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of artefacts affecting the original
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Executive Summary
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Table of contents1 Introduction ...
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sinks and transport pathways of rad
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m thick ‘bins’ s
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Bed shear stress exceedance - Sella
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Soulsby, R.L. and Whitehouse, R.J.S
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About usCefas is a multi-disciplina
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SummaryThe response of large volume
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Contents1. INTRODUCTION ...........
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Figure 3.15: 137 Cs activity concen
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2. MODEL PARAMETERISATIONThe approa
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Figure 2.2: Stripped 137 Cs count r
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200150Number of finds1005000 5 10 1
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1000 Bq kg -1SignificanceSignifican
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SignificanceSignificanceSignificanc
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0 Bq kg -1SignificanceSignificanceS
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40 Bq kg -13Significance21012.5 Bq
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3.1.2.2 Detailed Small Area SurveyF
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3.2 Patches of Enhanced 137 Cs acti
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3020Stripped cps100-100 200 400 600
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4. DISCUSSIONThe work reported here
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distribution. There appears to be n
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clearance reduce detection limits,
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Appendix A: Location and Activity D
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Position (BNG)Activity of recovered
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11/09/2007 301521 503408 6 Sand 195
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14/11/2007 301442 503457 4 Sand 255
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10/01/2008 301694 503522 12 Sand 27
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24/06/2008 301662 503500 4 Sand 263
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27/10/2008 302058 503065 5 Sand 128
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16/01/2009 301522 503320 7 Sand 367
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22/09/2009 301787 503592 7 Pebbles
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17/03/2010 301446 503542 2 Sand 26
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31/08/2010 300219 505597 0 Sand 33
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24/05/2010 299805 505799 3 Sand 30
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Activity of recoveredPosition (BNG)
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Page 2 of 3provides useful informat
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Week StartingSoftrak Beach Monitori
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Additional justification of 2011/12
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In the context of the total monitor
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Annual Report for 2010/11 and Forward Programme - Sellafield Ltd

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