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

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SSEM/2011/4730 June 2011Figure 3.5. The distribution of particle and stone beach finds on Braystones and Sellafieldbeach throughout the 2010/11 monitoring programme.© Nuclear Decommissioning Authority 2011. 25
SSEM/2011/4730 June 20114.5004.000Find Rate (finds per ha)3.5003.0002.5002.0001.5001.0002006/072007/082008/092009/102010/110.5000.000St Bees Nethertown Braystones Sellafield Seascale DriggMonitoring AreaFigure 3.6. Changes in year on year find rate at beaches closest to SellafieldThe key radionuclides detected by the Groundhog TM Synergy monitoring are 137 Cs and241 Am. Consequently, initial characterisation of each find recovered via the monitoringprogramme concentrates on these isotopes, such that, for positive analytical results; Finds with 241 Am activity greater than 137 Cs activity are classified as “alpha-rich”Finds with 137 Cs activity greater than 241 Am activity are classified as “beta-rich”.Finds with positive 60 Co activity and greater than the 137 Cs activity are classified as“Cobalt-rich”When Synergy was introduced in 2009, its greater capability for detecting low energy alphaand pure beta emitters resulted in a significant change in the find profile. In the latter half ofthe 2009/10 programme the number of finds classified as “alpha-rich” increased notably andthis trend continued throughout the 2010/11 annual beach monitoring programme (Table3.4). Over 84% of all finds were classified as alpha-rich and were detected on most beachesthat were surveyed (Table 3.5, Figure 3.8). The majority of beta-rich and a significantproportion of alpha-rich finds were recovered at Sellafield and Braystones (Figure 3.9).The number of finds classified as beta-rich continued to decline (down 36% compared to2009/10) even with the large increase in the total number of finds recovered throughout theprogramme. This trend is consistent with previous monitoring reports and suggests that theactive particles/stones are being removed (by the monitoring/retrieval programme) fasterthan they are becoming available in the beach environment. Furthermore, over 80% of betarichfinds were recovered from Sellafield beach which is also consistent with previousmonitoring programmes.© Nuclear Decommissioning Authority 2011. 26
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: SSEM/2011/4730 June 2011number of f
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 and 38: SSEM/2011/4730 June 2011Beta-rich A
Page 39 and 40: SSEM/2011/4730 June 2011Find Popula
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
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Page 75 and 76: SSEM/2011/4730 June 2011The finding
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SSEM/2011/4730 June 2011Communicati
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SSEM/2011/4730 June 20115. Health R
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SSEM/2011/4730 June 2011The numbers
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SSEM/2011/4730 June 2011wear gloves
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SSEM/2011/4730 June 20116. Aims and
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SSEM/2011/4730 June 2011specificati
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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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‘direction to’, and the convent
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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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