Closeout of the Melton Valley Completion Project at the Oak Ridge National Laboratory

Conference · Tue Jul 01 04:00:00 EDT 2008

OSTI ID:21319803

Bonilla, R; Johnson, Ch ^[1]; Skinner, R ^[2]; Adams, V ^[3]

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1. Bechtel Jacobs Company, LLC, Oak Ridge, TN (United States)
2. U.S. DOE, Oak Ridge Operations Office, Oak Ridge, TN (United States)
3. U.S. DOE, Office of Groundwater and Soil Remediation, Washington, DC (United States)

The U.S. Department of Energy DOE Order 413.3A (Program and Project Management for the Acquisition of Capital Assets) identifies major milestones in a project life cycle that require approval upon achievement, including Critical Decision-4 (CD-4), the project completion milestone. A CD-4 document is required for all DOE projects in accordance with DOE Order 413.3A, Program and Project Management for Acquisition of Capital Assets. A conditional CD-4 report was prepared for the Melton Valley Completion Project (MVCP) in order to document the completion of the remedial action in the Melton Valley watershed. Approval of the MVCP CD-4 was 'conditional' pending final resolution of a small quantity of unexpected pyrophoric material, with no current disposition pathway, remaining in one of the waste trenches that were to be remediated as part of the completion project. This paper will provide an overview of the MVCP remediation work and the process successfully used to demonstrate closeout of a major CERCLA project in accordance with DOE requirements. In summary: The MV ROD was planned to be completed in 12 years; however, under the ACP the remedial activities were completed 6 years ahead of schedule (September 2006). Highlights of the remedial actions include: - Completion of remedial action activities at 219 release sites identified in the MV ROD. - Construction of 58 hectares of multilayer caps for SWSA 4, SWSA 5, SWSA 6, Pits 2, 3 and 4 and Trenches 5, 6, and 7; - Complete excavation, retrieval and over-pack of 204 casks, 8 boxes, and 530 m{sup 3} of loose waste from the TRU waste retrieval project; - Complete demolition and disposition of approx. 557 m{sup 2} of various buildings such as HRE ancillary facilities, NHF, Liquid LLW pumping stations, 7841 Scrap Yard, misc. storage buildings, and well P and A; - Removal of LLW sludges and stabilization of T-1, T-2, and HFIR tanks; - In situ grouting/stabilization of approx. 12 km of inactive waste pipelines; - Excavation and disposition of approx. 38,000 m{sup 3} of soil from HFIR impoundments, HRE cryogenic pond, IHP and contaminated soil from miscellaneous leak sites; - Completion of in-situ grouting of LLLW matrix at Trenches 5 and 7. The CD-4 document to demonstrate attainment of the project completion milestone was prepared to document close-out activities. Approval of the MVCP CD-4 was obtained but deemed 'conditional' pending final resolution of a small quantity of unexpected pyrophoric material, with no current disposition pathway, remaining in Trench 13 of the 22 Trench Area in SWSA 5N. DOE is currently evaluating options for the final disposition of this material and has committed to resolution of the issue by the end of Fiscal Year 2008. At that time, all aspects of the Melton Valley Completion Project will be complete. (authors)

• Research Organization: WM Symposia, 1628 E. Southern Avenue, Suite 9 - 332, Tempe, AZ 85282 (United States)
• OSTI ID: 21319803
• Report Number(s): INIS-US--10-WM-08458
• Country of Publication: United States
• Language: English

Related Subjects

12 MANAGEMENT OF RADIOACTIVE AND NON-RADIOACTIVE WASTES FROM NUCLEAR FACILITIES
ALPHA-BEARING WASTES
GROUTING
LOW-LEVEL RADIOACTIVE WASTES
ORNL
PIPELINES
PROGRAM MANAGEMENT
REMEDIAL ACTION
STORAGE FACILITIES
US SUPERFUND