Unreviewed Disposal Question Evaluation - read free eBook in online reader or directly download on the web page. Select files or add your book in reader. Download and read online ebook Unreviewed Disposal Question Evaluation write by . This book was released on 2014. Unreviewed Disposal Question Evaluation available in PDF, EPUB and Kindle. Solid low-level waste disposal operations are controlled in part by an E-Area Low-Level Waste Facility (ELLWF) Performance Assessment (PA) that was completed by the Savannah River National Laboratory (SRNL) in 2008 (WSRC 2008). Since this baseline analysis, new information pertinent to disposal operations has been identified as a natural outcome of ongoing PA maintenance activities and continuous improvement in model simulation techniques (Flach 2013). An Unreviewed Disposal Question (UDQ) Screening (Attachment 1) has been initiated regarding the continued ability of the ELLWF to meet Department of Energy (DOE) Order 435.1 performance objectives in light of new PA items and data identified since completion of the original UDQ Evaluation (UDQE). The present UDQE assesses the ability of Solid Waste (SW) to meet performance objectives by estimating the influence of new information items on a recent sum-of-fractions (SOF) snapshot for each currently active E-Area low-level waste disposal unit. A final SOF, as impacted by this new information, is projected based on the assumptions that the current disposal limits, Waste Information Tracking System (WITS) administrative controls, and waste stream composition remain unchanged through disposal unit operational closure (Year 2025). Revision 1 of this UDQE addresses the following new PA items and data identified since completion of the original UDQE report in 2013: New Kd values for iodine, radium and uranium; Elimination of cellulose degradation product (CDP) factors; Updated radionuclide data; Changes in transport behavior of mobile radionuclides; Potential delay in interim closure beyond 2025; and Component-in-grout (CIG) plume interaction correction. Consideration of new information relative to the 2008 PA baseline generally indicates greater confidence that PA performance objectives will be met than indicated by current SOF metrics. For SLIT9, the previous prohibition of non-crushable containers in revision 0 of this UDQE has rendered the projected final SOF for SLIT9 less than the WITS Admin Limit. With respect to future disposal unit operations in the East Slit Trench Group, consideration of new information for Slit Trench#14 (SLIT14) reduced the current SOF for the limiting All-Pathways 200-1000 year period (AP2) by an order of magnitude and by one quarter for the Beta-Gamma 12-100 year period (BG2) pathway. On the balance, updates to K{sub d} values and dose factors and elimination of CDP factors (generally favorable) more than compensated for the detrimental impact of a more rigorous treatment of plume dispersion. These observations suggest that future operations in the East Slit Trench Group can be conducted with higher confidence using current inventory limits, and that limits could be increased if desired for future low-level waste disposal units. The same general conclusion applies to future ST's in the West Slit Trench Group based on the Impacted Final SOFs for existing ST's in that area.
Unreviewed Disposal Question
Unreviewed Disposal Question - read free eBook in online reader or directly download on the web page. Select files or add your book in reader. Download and read online ebook Unreviewed Disposal Question write by . This book was released on 2000. Unreviewed Disposal Question available in PDF, EPUB and Kindle. The Department of Energy's waste management Order, DOE O 435.1, requires that low--level waste disposal facilities develop and maintain a radiological performance assessment to ensure that disposal operations are within a performance envelope defined by performance objectives for long-term protection of the public and the environment. The Order also requires that a radiological composite analysis be developed and maintained to ensure that the disposal facility, in combination with other sources of radioactive material that may remain when all DOE activities have ceased, will not compromise future radiological protection of the public and the environment. The Order further requires that a Disposal Authorization Statement (DAS) be obtained from DOE Headquarters and that the disposal facility be operated within the performance assessment, composite analysis, and DAS. Maintenance of the performance assessment and composite analysis includes conducting test, research, and monitoring activit ies to increase confidence in the results of the analyses. It also includes updating the analyses as changes are proposed in the disposal operations, or other information requiring an update, becomes available. Personnel at the Savannah River Site have developed and implemented an innovative process for reviewing proposed or discovered changes in low-level radioactive waste disposal operations. The process is a graded approach to determine, in a disciplined manner, whether changes are within the existing performance envelope, as defined by the performance assessment, composite analysis, and DAS, or whether additional analysis is required to authorize the change. This process is called the Unreviewed Disposal Question (UDQ) process. It has been developed to be analogous to the Unreviewed Safety Question (UDQ) process that has been in use within DOE for many years. This is the first formalized system implemented in the DOE complex to examine low-level waste disposal changes the way the U nreviewed Safety Question process examines changes in nuclear facility operations. The process, which ensures that proposed or discovered changes receive the appropriate level of review, is now being used whenever changes such as new waste streams or changes in the design of a waste disposal unit are proposed at SRS. The process involves going through a series of questions to ensure that the change is within the existing performance envelope. Two series of questions are used. The first is a simple screening process. If the change is obviously within the performance envelope, it will be screened from further evaluation. If it cannot be screened, technical personnel involved in the performance assessment, composite analysis, and DAS processes, perform a more detailed evaluation using the second set of questions. If the evaluation shows that the change is within the performance envelope, it can be approved within the contractor's organization. If the evaluation does not clearly conclude t hat the change is within the performance envelope, then a Special Analysis or other more extensive study is triggered. This is a disciplined way to be sure that one knows which changes are significant and which are not, so that the proper attention can be given to the changes that are significant.
Unreviewed Disposal Question Evaluation
Unreviewed Disposal Question Evaluation - read free eBook in online reader or directly download on the web page. Select files or add your book in reader. Download and read online ebook Unreviewed Disposal Question Evaluation write by M. A. Phifer. This book was released on 2003. Unreviewed Disposal Question Evaluation available in PDF, EPUB and Kindle. One intent of DOE Order 435.1 (USDOE 1999a), as expressed in the performance assessment/composite analysis guidance (USDOE 1999c), is to ensure that proposed changes in wasteforms, containers, radionuclide inventories, facility design, and operations are reviewed to ensure that the assumptions, results, and conclusions of the DOE approved performance assessment (PA) (WSRC 2000), and composite analysis (CA) (WSRC 1997), as well as any Special analyses (SA) that might have been performed, remain valid (i.e., that the proposed change is bounded by the PA and CA) and the changes are within the bounds of the Disposal Authorization Statement (USDOE 1999b). The goal is to provide flexibility in day-to-day operation and to require those issues with a significant impact on the PA's conclusions, and therefore the projected compliance with performance objectives/measures, to be identified and brought to the proper level of attention. It should be noted that the term performance measure is used t o describe site specific adaptations of the DOE Order 435.1 Performance Objectives and requirements (e.g., performance measures such as applying drinking water standards to the groundwater impacts assessment). The intent of this document is to provide an evaluation of the issues identified within Problem Identification Report (PIR) number 2002-PIR-26-0050 (Kukraja 2002).
Unreviewed Disposal Question Evaluation
Unreviewed Disposal Question Evaluation - read free eBook in online reader or directly download on the web page. Select files or add your book in reader. Download and read online ebook Unreviewed Disposal Question Evaluation write by . This book was released on 2013. Unreviewed Disposal Question Evaluation available in PDF, EPUB and Kindle. Because Engineered Trench #3 (ET#3) will be placed in the location previously designated for Slit Trench #12 (ST#12), Solid Waste Management (SWM) requested that the Savannah River National Laboratory (SRNL) determine if the ST#12 limits could be employed as surrogate disposal limits for ET#3 operations. SRNL documented in this Unreviewed Disposal Question Evaluation (UDQE) that the use of ST#12 limits as surrogates for the new ET#3 disposal unit will provide reasonable assurance that Department of Energy (DOE) 435.1 performance objectives and measures (USDOE, 1999) will be protected. Therefore new ET#3 inventory limits as determined by a Special Analysis (SA) are not required.
Unreviewed Disposal Question Evaluation
Unreviewed Disposal Question Evaluation - read free eBook in online reader or directly download on the web page. Select files or add your book in reader. Download and read online ebook Unreviewed Disposal Question Evaluation write by Margaret R. Millings. This book was released on 2005. Unreviewed Disposal Question Evaluation available in PDF, EPUB and Kindle. The Saltstone Facility 0.2 Curie/gallon MAVRC (Mixer At Vault Roof Concept) Project will utilize various pieces of process equipment that have not been analyzed from a Performance Assessment perspective for future disposal. The proposed activity will involve the disposal of Saltstone process equipment in an empty Vault 1 cell and encasing the equipment in clean (nonradioactive) grout. An examination of this activity indicates that the disposal of up to 20 pieces of each specified component should not affect the assumptions, results, and conclusions of the approved Performance Assessment (PA) and Special Analyses (SA) for Saltstone, and that the activity is within the bounds of the Disposal Authorization Statement (DAS).
