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

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SSEM/2011/4730 June 2011Work commenced following a start-up meeting between SL and the contractors in February2010, with early focus concentrating on delivery of tasks 1, 3 & 6, with delivery of tasks 2, 4 &5 scheduled for later in the programme.Unfortunately and unexpectedly, WSC went out of business during the summer of 2010,resulting in the collapse of the hydrodynamic modelling contract, presenting SL with anumber of problems, both in relation to delivery of the above; and other work for the site thatwas reliant on the services of WSC.This contract had been in place for approximately six months when WSC went intoadministration, meaning that work had started on all of the tasks. At that time task 6 hadbeen completed by WSC; and tasks 1 & 3 were well underway with Cefas. Cefas had alsostarted some of the evaluation work to deliver task 5. Tasks 2 and 4 were to be deliveredthrough collaborative effort between WSC and Cefas and were in the early preparatorystages, being reliant on output from the other tasks to be completed.A major part of the work to improve the modelling was the gathering of new field data, inparticular the deployment of equipment onto the seabed to measure bed shear stress as partof task 3. In June 2010 an Aquadopp current profiler was deployed onto the seabed close tothe end of the existing sea pipeline diffusers. The plan was for a total deployment period ofapproximately six months. With a typical operating battery life lasting between 60 and 90days, the total deployment would be achieved by replacing the Aquadopp every 2 months(weather permitting). At the time of WSC folding, Cefas had the first Aquadopp in the watercollecting data and the timeframe for the first service/replacement visit was approaching.Without a contract in place there was a real risk that the Aquadopp work would not becompleted and a number of reports under preparation for other tasks would not be issued.The contract in place for the work was between SL and WSC; and due to the collaborativeelements of the contract, it was not legitimate on commercial grounds to re-award or transferthe remainder of the total contract directly to Cefas. However, the fact that equipment(Aquadopp and frame) had already been deployed and reports for other tasks were alreadybeing prepared by Cefas, meant that a limited contract was considered to be legitimate,allowing the ‘Cefas-only’ elements of the contract, that were already underway, to becompleted.Inevitably the need to prepare and issue a new contract did introduce delays for receipt offinal reports, against the original schedule, and has led to a re-think on the approach beingtaken for offshore monitoring. That said, the progress made against the completed tasks ofthe contract is reported below. Due to the collapse of the contract with WSC no progress isreported against tasks 2, 4 and 5. Discussion on the impacts of the failure to deliver thiswork can be found in Section 7.3 setting out the forward programme for offshorecharacterisation and monitoring.3.3.2 Progress on analysis and interpretation of existing swath bathymetry dataIn the 2010 update report, SL reported the initial findings from the Cefas analysis andinterpretation of the existing swath bathymetry data (see Figure 3.32), indicating that the datadid not fully satisfy the requirements of the transport and dispersion modelling work.In December 2010, Cefas were able to provide the finalised report on the swath bathymetrydata review; and provided the following conclusions:© Nuclear Decommissioning Authority 2011. 65
SSEM/2011/4730 June 2011[the Sellafield Ltd dive team vessel]Figure 3.32. Swath bathymetry along in the Cumbrian coastline within the Fledermaus 3Dvisualisation software. The position of the pipe (black line) and the navigation buoys (redcubes) are shown.SL accepts the Cefas conclusions and has been exploring options for obtaining an additionalswath bathymetry survey, including discussions with Environment Agency on use of theirsurveying capability. Further swath bathymetry survey work is discussed under Section 7.3.© Nuclear Decommissioning Authority 2011. 66
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Particles in the EnvironmentAnnual
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SSEM/2011/4730 June 2011ContentsPur
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SSEM/2011/4730 June 2011List of Tab
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SSEM/2011/4730 June 20111. Introduc
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SSEM/2011/4730 June 2011Figure 2.1.
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SSEM/2011/4730 June 2011In August 2
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SSEM/2011/4730 June 20112.3.4 Find
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Page 17 and 18: SSEM/2011/4730 June 2011The monitor
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Page 21 and 22: SSEM/2011/4730 June 2011Figure 3.2.
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Page 29 and 30: SSEM/2011/4730 June 2011Table 3.5.
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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
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Page 53 and 54: SSEM/2011/4730 June 2011In summary,
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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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Page 81 and 82: SSEM/2011/4730 June 2011The numbers
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Page 85 and 86: SSEM/2011/4730 June 20116. Aims and
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Page 95 and 96: SSEM/2011/4730 June 2011Fundamental
Page 97 and 98: SSEM/2011/4730 June 2011size and wi
Page 99 and 100: SSEM/2011/4730 June 201130 May Drig
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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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