Radioiodine Geochemistry in the SRS Subsurface Environment

Kaplan, Daniel I.; Emerson, Hilary P.; Powell, Brian A.; Roberts, Kimberly A.; Zhang, S.; Xu, Chen; Schwer, K.; Li, H.; Ho, Yi‐Fang; Denham, Miles; Yeager, Chris M.; Santschi, Peter H.

doi:10.2172/1079900

Cited by 4 publications

(4 citation statements)

References 24 publications

(36 reference statements)

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“…Environment -R&D conducted to explain the accumulation of I-129 in high organic carbon environments (Schwehr et al 2009(Schwehr et al , 2014Kaplan et al 2010Kaplan et al , 2014aKaplan et al , 2014bPowell et al 2010;Xu et al 2011aXu et al , 2011bXu et al , 2012Xu et al , 2013Zhang et al 2011Zhang et al , 2013Chang et al 2014 1. To be closed upon future DOE approval of the respective CA (or PA) Annual Summary Review within which completion of the item has been documented.…”

Section: • I-129 Geochemistry In Srs Wetlandmentioning

confidence: 99%

FY2020 Savannah River Site Composite Analysis Annual Summary Review

Stagich¹

2021

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This document provides the Department of Energy (DOE) Order 435.1 and its manual, Radioactive Waste Management (DOE 2021a(DOE , 2021b required Annual Review for the Savannah River Site (SRS) Composite Analysis (CA).Progress made to-date toward addressing the secondary issue from the LFRG review of the 2010 SRS CA has focused primarily upon inventory estimate improvements. Inventory impacts dose in a linear fashion and reduces the uncertainty with the CA conclusions. Maintenance items are addressed, as funding allows, based on the relative risk associated with meeting the performance objectives. Currently, there is minimal risk in exceeding the DOE 100 mrem/yr CA primary dose limit or the DOE 30 mrem/yr dose constraint (administrative limit).Proposed activities, discoveries, new information and changes potentially affecting the 2010 SRS CA are documented in this and earlier Annual Summary reports, and a consolidated list of changes since the 2010 CA is documented in this report. The impact to the CA of changes arising from updated performance assessment (PA) baselines [i.e., Saltstone Disposal Facility (SDF), E-Area Low-Level Waste Facility (ELLWF), and F & H Tank Farm (FTF & HTF) closures] is expected to be minor for the following reasons: The primary contributors to the SRS CA dose impact at the Upper Three Runs (UTR) point of assessment (POA) are the H-Canyon and Mixed Waste Management Facility (MWMF), contributing 68% and 9%, respectively, to the dose impact at that POA. The combined contribution to the UTR dose impact from all PA's (SDF, ELLWF, FTF and HTF) is ~2% of this total.The 2010 SRS CA model validation performed indicates that the CA projected dose, while generally conservative, provides a reasonable representation of the maximum annual doses. Doses evaluated are well below the SRS established 15 mrem/yr administrative limit (Crapse et al. 2011).Based on the assessment presented within this annual review and collective engineering judgement, the conclusions of the 2010 SRS CA remain valid and there is reasonable assurance that SRS will meet the performance objectives delineated in DOE Manual 435.1-1. The 2010 SRS CA should be updated to incorporate PA changes, proposed changes to inventories and sources and model improvements accumulated since the 2010 CA. The timing will be dependent on the completion of the ongoing E-Area PA revision.

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Section: • I-129 Geochemistry In Srs Wetlandmentioning

confidence: 99%

FY2020 Savannah River Site Composite Analysis Annual Summary Review

Stagich¹

2021

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“…Environment -R&D conducted to explain the accumulation of I-129 in high organic carbon environments (Schwehr et al 2009(Schwehr et al , 2014Kaplan et al 2010Kaplan et al , 2014aKaplan et al , 2014bPowell et al 2010;Xu et al 2011aXu et al , 2011bXu et al , 2012Xu et al , 2013 (CA Table 11 5,7,8,and 9 have been renumbered as Items 5,11,6,13,and 14,respectively,within Table 11-2): GoldSim TM has a Distributed Processing (DP) capability that can be used when performing probabilistic calculations. Using this feature, individual realizations can be run on as many processors as the master GoldSim TM simulation can be linked to.…”

Section: • I-129 Geochemistry In Srs Wetlandmentioning

confidence: 99%

Savannah River Site Composite Analysis (FY2019 Annual Review)

Stagich

Butcher

2020

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This document provides the Department of Energy (DOE) Order 435.1, Radioactive Waste Management (DOE 1999c) required Annual Review for the Savannah River Site (SRS) Composite Analysis (CA). Progress made to-date toward addressing the secondary issue from the LFRG review of the 2010 SRS CA has focused primarily upon inventory estimate improvements. Inventory impacts dose in a linear fashion and reduces the uncertainty with the CA conclusions. Maintenance items are addressed, as funding allows, based on the relative risk associated with meeting the performance objectives. Currently, there is minimal risk in exceeding the DOE 100 mrem/yr CA primary dose limit or the DOE 30 mrem/yr dose constraint (administrative limit). Proposed activities, discoveries, new information and changes potentially affecting the 2010 SRS CA are documented in this and earlier Annual Summary reports, and a consolidated list of changes since the 2010 CA is documented in this report. The impact to the CA of changes arising from these new PA baselines is expected to be minor for the following reasons: The primary contributors to the SRS CA dose impact at the UTR POA are the H-Canyon and Mixed Waste Management Facility (MWMF), contributing 68% and 9%, respectively, to the dose impact at that POA. The combined contribution to the UTR dose impact from all PA's (SDF, E-Area LLWF, FTF and HTF) is ~2% of this total. The 2010 SRS CA model validation performed indicates that the CA projected dose, while generally conservative, provides a reasonable representation of the maximum annual doses. Doses evaluated are well below the SRS established 15 mrem/yr administrative limit (Crapse et al. 2011). Based on the assessment presented within this annual review and collective engineering judgement, the conclusions of the 2010 SRS CA remain valid and there is reasonable assurance that SRS will meet the performance objectives delineated in DOE Order 435.1. The 2010 SRS CA should be updated to incorporate PA changes, proposed changes to inventories and sources and model improvements accumulated since the 2010 CA. The timing will be dependent on the completed of PA revisions.

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“…Branch -Developed a C-14 specific bioaccumulation factor (Hinton et al 2009).  I-129 Geochemistry in SRS Wetland Environment -R&D conducted to explain the accumulation of I-129 in high organic carbon environments (Schwehr et al 2009(Schwehr et al , 2014Kaplan et al 2010Kaplan et al , 2014aKaplan et al , 2014bPowell et al 2010;Xu et al 2011aXu et al , 2011bXu et al , 2012Xu et al , 2013Zhang et al , 2013Chang et al 2014;Emerson et al 2014;Li et al 2014;Kaplan 2016a Closure of this item is contingent on this decision.…”

Section: Srnl-sti-2018-00031mentioning

confidence: 99%

FY2017 Savannah River Site composite analysis annual review

Halverson

Jannik

2018

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Radioiodine Geochemistry in the SRS Subsurface Environment

Cited by 4 publications

References 24 publications

FY2020 Savannah River Site Composite Analysis Annual Summary Review

FY2020 Savannah River Site Composite Analysis Annual Summary Review

Savannah River Site Composite Analysis (FY2019 Annual Review)

FY2017 Savannah River Site composite analysis annual review

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