SNM holdup measurements for Los Alamos exhaust ducts, Interim Phase 2 report
Technical Report
·
OSTI ID:10185131
Quantitative (Phase II) holdup measurements were made on ventilation exhaust ducts at three Los Alamos facilities to assess the quantity of fissile material deposited inside the ducts. The ducts requiring rigorous, quantitative measurements were identified through a comprehensive but less quantitative Phase I measurement program. From the Phase I and II measurements, ducts servicing two rooms at TA-21 (DP Site) are estimated to contain 385 g of {sup 235}U(room 313) and 381 g of {sup 235}U (room 413R). Uncertainties in these estimates are discussed in detail and are assigned one standard deviation values of 153 g of {sup 235}U for room 313 and 139 g of {sup 235}U for room 413R. These ducts are in rooms that have been inactive since 1985 and are scheduled and funded for removal in 1992 or 1993. The one room identified at TA-55, PF-4 for Phase II measurement has been measured and the estimated duct holdup is 39 g of {sup 239}Pu with a one standard deviation uncertainty of 28 g. Fissile material holdup has also been estimated from Phase I and Phase II measurements on lengthy ducts servicing three rooms at TA-3/SM-29 (CMR Building). These room ducts are estimated to contain a maximum fissile holdup of 345 (room 4023), 119 (room 4034), and 88 (room 5034) g of {sup 235}U. With the exception of one segment of duct (estimated to contain 0.8 g of {sup 239}Pu), no ducts displayed gamma spectra from fissile isotopes.
- Research Organization:
- Los Alamos National Lab., NM (United States)
- Sponsoring Organization:
- USDOE, Washington, DC (United States)
- DOE Contract Number:
- W-7405-ENG-36
- OSTI ID:
- 10185131
- Report Number(s):
- LA--12374-MS; ON: DE93001652
- Country of Publication:
- United States
- Language:
- English
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