235U Holdup Measurements in Three 321-M Exhaust HEPA Banks
The Analytical Development Section of Savannah River National Laboratory (SRNL) was requested by the Facilities Disposition Division to determine the holdup of enriched uranium in the 321-M facility as part of an overall deactivation project of the facility. The 321-M facility was used to fabricate enriched uranium fuel assemblies, lithium-aluminum target tubes, neptunium assemblies, and miscellaneous components for the production reactors. The results of the holdup assays are essential for determining compliance with the Waste Acceptance Criteria, Material Control & Accountability, and to meet criticality safety controls. This report covers holdup measurements of uranium residue in three HEPA filter exhaust banks of the 321-M facility. Each of the exhaust banks has dimensions near 7' x 14' x 4' and represents a complex holdup problem. A portable HPGe detector and EG&G Dart system that contains the high voltage power supply and signal processing electronics were used to determine highly enriched uranium (HEU) holdup. A personal computer with Gamma-Vision software was used to control the Dart MCA and to provide space to store and manipulate multiple 4096-channel {gamma}-ray spectra. Some acquisitions were performed with the portable detector configured to a Canberra Inspector using NDA2000 acquisition and analysis software. Our results for each component uses a mixture of redundant point source and area source acquisitions that yielded HEU contents in the range of 2-10 grams. This report discusses the methodology, non-destructive assay (NDA) measurements, assumptions, and results of the uranium holdup in these items. This report includes use of transmission-corrected assay as well as correction for contributions from secondary area sources.
- Research Organization:
- SRS
- Sponsoring Organization:
- USDOE National Nuclear Security Administration (NNSA), Nuclear Criticality Safety Program (NCSP)
- DOE Contract Number:
- AC09-96SR18500
- OSTI ID:
- 890161
- Report Number(s):
- WSRC-TR-2004-00597
- Country of Publication:
- United States
- Language:
- English
Similar Records
235U Holdup Measurements in the 321-M Exhaust Elbows
Gamma-Ray Holdup Measurements of U-235, Np-237, and Am-241 Content in the C and D Out-gassing Ovens in the Deactivation and Decommissioning Activities in 321-M
Efficiency Calibration Using HEU Standards of 2-Inch by 2-Inch NaI Detector
Technical Report
·
Thu Mar 21 19:00:00 EST 2002
·
OSTI ID:799691
Gamma-Ray Holdup Measurements of U-235, Np-237, and Am-241 Content in the C and D Out-gassing Ovens in the Deactivation and Decommissioning Activities in 321-M
Technical Report
·
Thu Sep 16 00:00:00 EDT 2004
·
OSTI ID:840796
Efficiency Calibration Using HEU Standards of 2-Inch by 2-Inch NaI Detector
Technical Report
·
Tue Oct 24 00:00:00 EDT 2000
·
OSTI ID:766281