Neutron and Gamma Probe Application to Hanford Tank 241-SY-101
Conference
·
OSTI ID:801314
- COGEMA
A neutron (moisture-sensitive) and gamma (in-situ radiation) probe technique has been utilized at a number of Hanford radioactive waste tanks for many years. This technology has been adapted for use in tank 241-SY-101's two Multifunction Instrument Trees (MITs) which have a hollow dry-well center opening two inches (51 cm) in diameter. These probes provide scans starting within a few inches of the tank bottom and traversing up through the top of the tank revealing a variety of waste features as a function of tank elevation. These features have been correlated with void fraction data obtained independently from two other devices, the Retained Gas Sampler (RGS) and the Void Fraction Instrument (VFI). The MIT probes offer the advantage of nearly continuous count-rate versus elevation scans and they can be operated significantly more often and at lower cost than temperature probes or the RGS or VFI devices while providing better depth resolution. The waste level in tank 241-SY-101 had been rising at higher rates than expected during 1998 and early 1999 indicating an increasing amount of trapped gas in the waste. The use of the MIT probes has assisted in evaluating changes in crust thickness and level and also in estimating relative changes in gas stored in the crust. This information is important in assuring that the tank remains in a safe configuration and will support safe waste transfer when those operations take place.
- Research Organization:
- COGEMA (US)
- Sponsoring Organization:
- ENVIRONMENTAL MANAGEMENT (US)
- DOE Contract Number:
- AC06-96RL13200
- OSTI ID:
- 801314
- Report Number(s):
- HNF-4897-FP, Rev.0
- Country of Publication:
- United States
- Language:
- English
Similar Records
The behavior, quantity, and location of undissolved gas in Tank 241-SY-101
In situ determination of rheological properties and void fraction in Hanford Waste Tank 241-SY-101
A Discussion of SY-101 Crust Gas Retention and Release Mechanisms
Technical Report
·
Sun Oct 01 00:00:00 EDT 1995
·
OSTI ID:135059
In situ determination of rheological properties and void fraction in Hanford Waste Tank 241-SY-101
Technical Report
·
Tue Aug 01 00:00:00 EDT 1995
·
OSTI ID:95280
A Discussion of SY-101 Crust Gas Retention and Release Mechanisms
Technical Report
·
Mon Feb 22 23:00:00 EST 1999
·
OSTI ID:3760