Limer LMC, Assessment Calculations for C-14 Labelled Gas and ...

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calculated annual ingestion dose for the reference PEG (C) of 20 µSv (i.e. a doseequivalent to the risk guidance level of 1E-6 y -1 ; EA et al., 2009).The time periods following cap completion that it takes the average fluxes to dropbelow that level are given in Table 5-3. These times are similar to those for the RDAassessment (relevant values from the RDA reference case are provided forcomparison).Table 5-3: Time period following completion of final cap before average flux dropsbelow that associated with an effective ingestion dose of 2.0E-2 mSv for thereference PEG (C)CaseTime period following completion of final cap beforeaverage flux drops below that associated with a risk of1E-6 y -1 for PEG ATrenches RDA Vaults EDA VaultsReference Case (Case2_InvA) ~ 100 y ~ 350 y ~ 300 yCase2_InvA_C14rel ~ 100 y ~ 300 y ~ 300 yCase2_var1_InvA ~ 100 y ~ 300 y ~ 150 yCase2_InvA_S3M ~ 100 y ~ 350 y ~ 350 yCase_InvB ~ 100 y ~350 y ~ 400 yReference Case for RDA assessment ~ 100 y ~340 y N/AThe timescales upon which calculated annual effective ingestion doses for the referencePEG drop below the target are broadly similar in each case.For Case2_var1_InvA, where the flow through the wastes are assumed to be higherdue to increased infiltration rates, the time for the C-14 fluxes to drop below the targetis substantially shorter for the EDA vaults (see also Figure 5-7b). When the Stage 3decommissioning metals are assumed to be subject to a slower release rate of C-14 thanother metals, the tail of the C-14 flux from the wastes takes longer to decline, leading toit taking about 400 years for the flux to drop below that associated with the target.24
QRS-1443ZH-1, Version 3.0(a)Total Flux of C-14 LabelledGas from Area (Bq y-1)10 1010 810 6TrenchesRDA VaultsEDA Vaults10 12 Year10 42100 2200 2300 2400 2500 2600 2700 2800 2900 3000(b)Total Flux of C-14 LabelledGas from Area (Bq y-1)10 1010 810 6TrenchesRDA VaultsEDA Vaults10 12 Year10 42100 2200 2300 2400 2500 2600 2700 2800 2900 3000(c)Total Flux of C-14 LabelledGas from Area (Bq y-1)10 1010 810 6TrenchesRDA VaultsEDA Vaults10 12 Year10 42100 2200 2300 2400 2500 2600 2700 2800 2900 3000(d)Total Flux of C-14 LabelledGas from Area (Bq y-1)10 1010 810 6TrenchesRDA VaultsEDA Vaults10 12 Year10 42100 2200 2300 2400 2500 2600 2700 2800 2900 3000Figure 5-6: Total Decay Corrected Fluxes of C-14 Labelled Gas from the Wastes forthe Variant Cases (Bq y -1 ). (a) Case2_InvAC14rel; (b) Case2_var1_InvA; (c)Case2_InvA_S3M; and (d) Case2_InvB.25
Page 3: Les thèmes du portail Leçon 3Néa
Page 7: QRS-1443ZH-1, Version 3.0SummaryThe
Page 11 and 12: QRS-1443ZH-1, Version 3.01 Introduc
Page 13 and 14: QRS-1443ZH-1, Version 3.02 Summary
Page 15 and 16: QRS-1443ZH-1, Version 3.0case, it i
Page 17 and 18: QRS-1443ZH-1, Version 3.0consumed d
Page 19 and 20: QRS-1443ZH-1, Version 3.0relation t
Page 21 and 22: QRS-1443ZH-1, Version 3.0In the RDA
Page 24 and 25: Table 3-2: Rn-222 Inventory Informa
Page 26 and 27: Please see Table 5-1 of Limer et al
Page 28 and 29: contribute substantially to the tot
Page 30 and 31: Calculated Effective Ingestion Dose
Page 32 and 33: (a)Annual Effective IngestionExposu
Page 36 and 37: Figure 5-7: Average Decay Corrected
Page 38 and 39: Figure 5-9: Calculated Effective An
Page 40 and 41: Table 5-5: Calculated Annual Effect
Page 42 and 43: Table 5-7: Calculated Annual Effect
Page 44 and 45: Table 5-9: Calculated Effective Inh
Page 46 and 47: Table 5-11: Calculated Effective In
Page 48 and 49: throughout. The reference case is h
Page 50 and 51: EDAVaults_NoCap@10000y and Vaults15
Page 52 and 53: area of the cap over vault 8 were t
Page 54: the Nuclear Decommissioning Authori

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