Unreviewed Disposal Question Evaluation: Waste Disposal In Engineered Trench #3

Hamm, L. L.; Smith, F. G.; Flach, G. P.; Hiergesell, R.A.; Butcher, B. T.

doi:10.2172/1089500

“…• A UDQE was approved for placing ET 3 in the footprint designated for ST 12 and to operate it using ST 12 disposal limits. The evaluation concluded that the proposed operations result in an acceptably SRNL-STI-2020-00054 Revision 0 B-8 small risk of exceeding a Sum-of-Fractions of 1.0 (Hamm et al 2013). • A change in the layout of SDUs 6, 7, 8, and 9 was assessed by SA (SRR 2016, SRR 2018a.…”

Section: B5 Other Updated Considerations Since the 2010 Srs Camentioning

confidence: 99%

Savannah River Site Composite Analysis (FY2019 Annual Review)

Stagich

¹

,

Butcher

²

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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“…This value is 0.19 mrem/yr, which is far below the DOE 458.1 dose limit of 100 mrem/yr. SRNL-STI-2019-00748 Revision 1 Four times a year N/A N/A 1 Calculated using peak fraction flux of 0.125 Ci/yr per Ci disposed (Hamm et al, 2013) and inventory limit of 4.2 Ci for the disposal unit (Butcher, 2017…”

Section: Surface Water Compliancementioning

confidence: 99%

FY2019 Performance Assessment Annual Review for the E-Area Low-Level Waste Facility

Wohlwend

¹

,

Butcher

²

,

Dixon

³

et al. 2020

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The Savannah River Site (SRS) E-Area Low-Level Waste Facility (ELLWF) consists of six types of disposal units described in the Performance Assessment (PA) (WSRC, 2008): Low Activity Waste Vault (LAWV), Intermediate Level Vault (ILV), Trenches [Slit Trenches (STs), Engineered Trenches (ETs), and Component-in-Grout (CIG) Trenches], and Naval Reactor Component Disposal Areas (NRCDAs). The ELLWF is a part of the Solid Waste Management Facility (SWMF). SWMF is managed and operated by the SRS Management and Operations prime contractor, Savannah River Nuclear Solutions (SRNS). Within SRNS, the Solid Waste Management (SWM) organization is responsible for operating the SWMF, and the Savannah River National Laboratory (SRNL) is the technical agency responsible for preparing and maintaining the PA. SWMF operations have been performed at SRS since 1952. The mission of the SWMF is to provide storage, processing, disposal, and shipment of radioactive, hazardous, and mixed waste. The SWMF is committed to treat, store, and dispose of these waste products in a manner that protects the environment and the health and safety of the facility worker, the co-located worker, and the offsite general public. Wastes handled in the SWMF include low level waste, transuranic waste, hazardous waste, Toxic Substances Control Act waste, and mixed waste (containing both hazardous and radioactive constituents). SRS low-level waste management at ELLWF is regulated under Department of Energy (DOE) Order 435.1 (DOE 1999a) and is authorized under a Disposal Authorization Statement (DAS) as a federal permit. The original DAS was issued by Department of Energy-Headquarters (DOE-HQ) on September 28, 1999 (DOE 1999b) for the operation of the ELLWF and the Saltstone Disposal Facility. Those portions of that DAS applicable to the ELLWF were superseded by Revision 1 of the

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“…Results and projected radiation doses to the public are published in the SRS Annual Environmental Report and are compared to CA predictions in the CA annual reviews (Kubilius et al, 2019b). The most recent predicted maximum dose to a member of the public, via the liquid pathway + irrigation dose at locations below ELLWF, is published in the 2018 Annual Environmental Report (SRNS, 2019) and shown in (Hamm et al, 2013) and inventory limit of 4.2 Ci for the disposal unit (Butcher, 2017 (Kubilius et al, 2019a) affirms that the disposal facility continued to operate within the bounds of the current PA baseline and satisfied all the requirements, conditions, and limitations identified in the DAS. The number of proposed changes to data, models, and operational plans that are used as input to the E-Area PA suggest the need for a new PA revision.…”

Section: Surface Water Compliancementioning

confidence: 99%

FY2019 Performance Assessment Annual Review for the E-Area Low-Level Waste Facility

Wohlwend

¹

,

Butcher

²

,

Dixon

³

et al. 2020

0

View full text Add to dashboard Cite

The Savannah River Site (SRS) E-Area Low-Level Waste Facility (ELLWF) consists of six types of disposal units described in the Performance Assessment (PA) (WSRC, 2008): Low Activity Waste Vault (LAWV), Intermediate Level Vault (ILV), Trenches [Slit Trenches (STs), Engineered Trenches (ETs), and Component-in-Grout (CIG) Trenches], and Naval Reactor Component Disposal Areas (NRCDAs). The ELLWF is a part of the Solid Waste Management Facility (SWMF). SWMF is managed and operated by the SRS Management and Operations prime contractor, Savannah River Nuclear Solutions (SRNS). Within SRNS, the Solid Waste Management (SWM) organization is responsible for operating the SWMF, and the Savannah River National Laboratory (SRNL) is the technical agency responsible for preparing and maintaining the PA. SWMF operations have been performed at SRS since 1952. The mission of the SWMF is to provide storage, processing, disposal, and shipment of radioactive, hazardous, and mixed waste. The SWMF is committed to treat, store, and dispose of these waste products in a manner that protects the environment and the health and safety of the facility worker, the co-located worker, and the offsite general public. Wastes handled in the SWMF include low level waste, transuranic waste, hazardous waste, Toxic Substances Control Act waste, and mixed waste (containing both hazardous and radioactive constituents). SRS low-level waste management at ELLWF is regulated under Department of Energy (DOE) Order 435.1 (DOE 1999a) and is authorized under a Disposal Authorization Statement (DAS) as a federal permit. The original DAS was issued by Department of Energy-Headquarters (DOE-HQ) on September 28, 1999 (DOE 1999b) for the operation of the ELLWF and the Saltstone Disposal Facility. Those portions of that DAS applicable to the ELLWF were superseded by Revision 1 of the

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Unreviewed Disposal Question Evaluation: Waste Disposal In Engineered Trench #3

Cited by 12 publications

References 10 publications

Savannah River Site Composite Analysis (FY2019 Annual Review)

Savannah River Site Composite Analysis (FY2019 Annual Review)

FY2019 Performance Assessment Annual Review for the E-Area Low-Level Waste Facility

FY2019 Performance Assessment Annual Review for the E-Area Low-Level Waste Facility

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