11 Matching Results

Search Results

Advanced search parameters have been applied.

Results of instrument reliability study for high-level nuclear-waste repositories. [Geotechnical parameters]

Description: Reliable instrumentation will be needed to monitor the performance of future high-level waste repository sites. A study has been made to assess instrument reliability at Department of Energy (DOE) waste repository related experiments. Though the study covers a wide variety of instrumentation, this paper concentrates on experiences with geotechnical instrumentation in hostile repository-type environments. Manufacturers have made some changes to improve the reliability of instruments for repositories. This paper reviews the failure modes, rates, and mechanisms, along with manufacturer modifications and recommendations for additional improvements to enhance instrument performance. 4 tables.
Date: October 1, 1982
Creator: Rogue, F. & Binnall, E.P.
Partner: UNT Libraries Government Documents Department

Instrument reliability for high-level nuclear-waste-repository applications

Description: Reliable instrumentation will be needed to evaluate the characteristics of proposed high-level nuclear-wasted-repository sites and to monitor the performance of selected sites during the operational period and into repository closure. A study has been done to assess the reliability of instruments used in Department of Energy (DOE) waste repository related experiments and in other similar geological applications. The study included experiences with geotechnical, hydrological, geochemical, environmental, and radiological instrumentation and associated data acquisition equipment. Though this paper includes some findings on the reliability of instruments in each of these categories, the emphasis is on experiences with geotechnical instrumentation in hostile repository-type environments. We review the failure modes, rates, and mechanisms, along with manufacturers modifications and design changes to enhance and improve instrument performance; and include recommendations on areas where further improvements are needed.
Date: January 31, 1983
Creator: Rogue, F.; Binnall, E.P. & Armantrout, G.A.
Partner: UNT Libraries Government Documents Department

Executive committee report: geotechnical instrumentation working group meeting

Description: Responding to the widespread need for the geotechnical community to discuss instrumentation for nuclear waste repositories, a meeting was held December 2 and 3, 1981, in Denver, Colorado. This report gives the group's consensus recommendations to aid in making decisions for development of instrumentation for future repository work. The main conclusions of the working group meeting were as follows: (1) monitoring of geotechnical parameters in nuclear waste repositories will be necessary to meet licensing requirements; (2) currently available instruments are underdeveloped for this monitoring; (3) research and development to provide adequate instrumentation will need to be performed under federal sponsorship by national laboratories, universities, contractors, and consultants; and (4) a NASA-type reliability program is needed to meet the quality assurance, durability, calibration, and time schedule demands of geotechnical instrumentation development. This will require significant financial commitments from the federal sector.
Date: April 26, 1982
Creator: Wilder, D.G.; Rogue, F.; Beloff, W.R.; Binnall, E. & Gregory, E.C.
Partner: UNT Libraries Government Documents Department

Instrument evaluation, calibration, and installation for the heater experiments at Stripa

Description: Borehole instrumentation for the measurement of temperature, displacement, and stress was evaluated, modified, calibrated, and installed in an underground site at Stripa, Sweden where experiments are currently underway to investigate the suitability of granite as a storage medium for nuclear waste. Three arrays of borehole instrumentation measure the thermomechanical effects caused by electrical heaters which simulate the thermal output of canisters of radioactive waste. Because most rock mechanics investigations are carried out at modest temperatures, a sustained operating temperature as high as 200/sup 0/C was an unusual and most important criterion governing the instrumentation program. Extensive laboratory experiments were conducted to determine the effect of high temperature on instrument behavior and also to develop calibration and data-reduction procedures. The rod extensometers were tested for anchor creep, the selection of a suitable high-temperature pressurizing fluid, and the thermal stability of the grout. Four temperature corrections are incorporated into the data reduction of the USBM borehole deformation measurement: the bridge voltage offset correction, the change in calibration factor induced by temperature, and the thermal expansion of the gage and of the rock. The vibrating wire gages were calibrated in the laboratory by loading gages installed in a granite block at pressures up to 13 MPa and at temperatures ranging from 20/sup 0/ to 200/sup 0/C. Both the slope and offset of the response equation are corrected for temperature effects. Most thermocouples were calibrated in an oven at the field site. Thermocouples were emplaced with individual gages and into holes backfilled with sand or grout.
Date: December 1, 1979
Creator: Schrauf, T.; Pratt, H.; Simonson, E.; Hustrulid, W.; Nelson, P.; DuBois, A. et al.
Partner: UNT Libraries Government Documents Department

Electrical heaters for thermo-mechanical tests at the Stripa mine

Description: Electrical heaters were installed at the Stripa mine in Sweden to simulate the heat flux expected from canisters containing nuclear waste. Three heater types were designed and fabricated: two full scale heaters, 2.6 m in length and 324 mm in diameter, supplying a maximum power output of 5 kW; eight peripheral heaters of 25 mm diameter, supplying 1.1 kW; and eight time scale heaters, one-third the size and power of the full scale heaters. The heater power can be monitored by panel meters as well as by a computer-based data acquisition system. Both the controller and the heater were designed with a high degree of redundancy in case of component failure. Auxiliary items were provided with the heaters to monitor borehole decrepitation and heater temperature, and to dewater the heater holes. This report describes the above systems and relates experience gained during testing, installation, and operation.
Date: January 1, 1979
Creator: Burleigh, R.H.; Binnall, E.P.; DuBois, A.O.; Norgren, D.U. & Ortiz, A.R.
Partner: UNT Libraries Government Documents Department

Heater test planning for the Near Surface Test Facility at the Hanford reservation. Volume II. Appendix

Description: Volume II contains the following information: theoretical support for radioactive waste storage projects - development of data analysis methods and numerical models; injectivity temperature profiling as a means of permeability characterization; geophysical holes at the Near Surface Test Facility (NSTF), Hanford; proposed geophysical and hydrological measurements at NSTF; suggestions for characterization of the discontinuity system at NSTF; monitoring rock property changes caused by radioactive waste storage using the electrical resistivity method; microseismic detection system for heated rock; Pasco Basin groundwater contamination study; a letter to Mark Board on Gable Mountain Faulting; report on hydrofracturing tests for in-situ stress measurement, NSTF, Hole DC-11, Hanford Reservation; and borehole instrumentation layout for Hanford Near Surface Test Facility.
Date: April 1, 1979
Creator: DuBois, A.; Binnall, E.; Chan, T.; McEvoy, M.; Nelson, P. & Remer, J.
Partner: UNT Libraries Government Documents Department

Heater test planning for the near surface test facility at the Hanford reservation

Description: The underground test facility NSTF being constructed at Gable Mountain, is the site for a group of experiments designed to evaluate the thermo-mechanical suitability of a deep basalt stratum as a permanent repository for nuclear waste. Thermo-mechanical modeling was performed to help design the instrumentation arrays for the three proposed heater tests (two full scale tests and one time scale test) and predict the thermal environment of the heaters and instruments. The modeling does not reflect recent RHO revisions to the in situ heater experiment plan. Heaters, instrumentation, and data acquisition system designs and recommendations were adapted from those used in Sweden. (DLC)
Date: March 1, 1979
Creator: DuBois, A.; Binnall, E.; Chan, T.; McEvoy, M.; Nelson, P. & Remer, J.
Partner: UNT Libraries Government Documents Department

Microprocessor controlled anodic stripping voltameter for trace metals analysis in tap water

Description: The construction and use of a portable, microprocessor controlled anodic stripping voltameter for on-site simultaneous metal analysis of copper, lead and cadmium in tap water is discussed. The instrumental system is comprised of a programmable controller which permits keying in analytical parameters such as sparge time and plating time; a rotating cell for efficient oxygen removal and amalgam formation; and, a magnetic tape which can be used for data storage. Analysis time can be as short as 10 to 15 minutes. The stripping analysis is based on a pre-measurement step during which the metals from a water sample are concentrated into a thin mercury film by deposition from an acetate solution of pH 4.5. The concentrated metals are then electrochemically dissolved from the film by application of a linearly increasing anodic potential. Typical peak-shaped curves are obtained. The heights of these curves are related to the concentration of metals in the water by calibration data. Results of tap water analysis showed 3 +- 1 ..mu..g/L lead, 22 +- 0.3 ..mu..g/L copper, and less than 0.2 ..mu..g/L cadmium for a Berkeley, California tap water, and 1 to 1000 ..mu..g/L Cu, 1 to 2 ..mu..g/L Pb for ten samples of Seattle, Washington tap water. Recommendations are given for a next generation instrument system.
Date: April 1, 1981
Creator: Clem, R.G.; Park, F.W.; Kirsten, F.A.; Phillips, S.L. & Binnall, E.P.
Partner: UNT Libraries Government Documents Department

Modular multi-wire readout system for proportional wire chambers

Description: From nuclear science symposium; San Francisco, California, USA (14 Nov 1973). The design features of a data readout system for multiwire proportional chambers are described. The electronic circuitry for this amplifier-per-wire'' system has been designed in modular form to provide ease in system assembly, flexibility, and economy. Fast readout of the hit-pattern data is accomplished by using priority encoder integrated circuits for address generation and bit- parallel transfer of the output data words. About 7000 channels have been implemented using this system and an additional 4000 channels have been ordered. An analysis of cost per channel is given, based on the experience gained thus far. (auth)
Date: November 1, 1973
Creator: Olson, S.R.; Kirsten, F.A.; Binnall, E.P.; Lee, K.L.; Bhandari, N.N. & Nunnally, C.C.
Partner: UNT Libraries Government Documents Department

Thermal and thermomechanical data from in situ heater experiments at Stripa, Sweden. Technical Information Report No. 29

Description: Heater experiments were conducted in a granite body adjacent to a recently abandoned iron ore mine at Stripa, Sweden, to investigate the response of a hard rock mass to thermal loading. Heating commenced in June, 1978 and lasted for approximately one year. The rock was heavily instrumented to measure the temperature, displacement, and stress fields. Monitoring of the rock response continued for half a year after the heaters were deactivated. In-situ post-experiment calibrations of instrumentation were completed by June 1980. The enormous data base (approximately 50 million measurements), recorded by a computer-based data acquisition system, has now been structured, verified, and converted to engineering units. This report describes the types of data available and the procedures used for data acquisition, transfer, encoding-decoding, reorganization, storage, processing, and verification. Information is given on data structure and format and how potential users can access the computer-readable data.
Date: September 1, 1980
Creator: Chan, T.; Binnall, E.; Nelson, P.; Stolzman, R.; Wan, O.; Weaver, C. et al.
Partner: UNT Libraries Government Documents Department