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ISOTHERMAL AIR INGRESS VALIDATION EXPERIMENTS

Description: Idaho National Laboratory carried out air ingress experiments as part of validating computational fluid dynamics (CFD) calculations. An isothermal test loop was designed and set to understand the stratified-flow phenomenon, which is important as the initial air flow into the lower plenum of the very high temperature gas cooled reactor (VHTR) when a large break loss-of-coolant accident occurs. The unique flow characteristics were focused on the VHTR air-ingress accident, in particular, the flow … more
Date: September 1, 2011
Creator: Oh, Chang H & Kim, Eung S
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

In-place HEPA filter penetration test

Description: We have demonstrated the feasibility of conducting penetration tests on high efficiency particulate air (HEPA) filters as installed in nuclear ventilation systems. The in-place penetration test, which is designed to yield equivalent penetration measurements as the standard DOP efficiency test, is based on measuring the aerosol penetration of the filter installation as a function of particle size using a portable laser particle counter. This in-place penetration test is compared to the current i… more
Date: January 1, 1997
Creator: Bergman, W.; Wilson, kK.; Elliott, J.; Bettencourt, B. & Slawski, J.W.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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Potential for Hepa filter damage from water spray systems in filter plenums

Description: The water spray systems in high efficiency particulate air (HEPA) filter plenums that are used in nearly all Department of Energy (DOE) facilities for protection against fire was designed under the assumption that the HEPA filters would not be damaged by the water sprays. The most likely scenario for filter damage involves filter plugging by the water spray, followed by the fan blowing out the filter medium. A number of controlled laboratory tests that were previously conducted in the late 1980… more
Date: January 1, 1997
Creator: Bergman, W.; Fretthold, J.K. & Slawsld, J.W.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

Radionuclide Air Emissions Report for the Hanford Site Calendar year 1998

Description: This report documents radionuclide air emissions from the Hanford Site in I998 and the resulting effective dose equivalent to the maximally exposed individual (MEI) member of the public. The report has been prepared in accordance with the Code of Federal Regulations, Title 40, Protection of the Environment, Part 61, National Emission Standards for Hazardous Air Pollutants (40 CFR SI), Subpart H, ''National Emission Standards for Emissions of Radionuclides Other than Radon from Department of Ene… more
Date: June 15, 1999
Creator: DIEDIKER, L.P.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Air Monitoring Modeling of Radioactive Releases During Proposed PFP Complex Demolition Activities

Description: This report is part of the planning process for the demolition of the 234-5Z, 236-Z, 242-Z, and 291-Z-1 structures at the Plutonium Finishing Plant (PFP) facilities on the Hanford Site. Pacific Northwest National Laboratory (PNNL) supports the U.S. Department of Energy (DOE) and the CH2M HILL Plateau Remediation Company (CHPRC) demolition planning effort by making engineering estimates of potential releases for various potential demolition alternatives. This report documents an analysis conside… more
Date: January 24, 2011
Creator: Napier, Bruce A.; Droppo, James G. & Rishel, Jeremy P.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Further development of the cleanable steel HEPA filter, cost/benefit analysis, and comparison with competing technologies

Description: We have made further progress in developing a cleanable steel fiber HEPA filter. We fabricated a pleated cylindrical cartridge using commercially available steel fiber media that is made with 1 {mu}m stainless steel fibers and sintered into a sheet form. Test results at the Department of Energy (DOE) Filter Test Station at Oak Ridge show the prototype filter cartridge has 99.99% efficiency for 0.3 {mu}m dioctyl phthalate (DOP) aerosols and a pressure drop of 1.5 inches. Filter loading and clean… more
Date: January 1, 1997
Creator: Bergman, W.; Larsen, G.; Lopez, R.; Wilson, K.; Witherell, C. & McGregor, M.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

Technical Issues Associated with Air Ingression During Core Degradation

Description: This paper has shown that it is possible to get significant air intrusion into a ruptured reactor vessel even from a reactor cavity with restricted access. This suggests that there is some importance to considering the consequences of air intrusion following vessel penetration by core debris. The consequences will depend on the nature of core degradation in air and other oxidizing gases. If, indeed, fuel becomes exposed to strongly oxidizing gases, significant releases of ruthenium and hexavale… more
Date: June 5, 2000
Creator: Powers, Dana A.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

Analysis on the Density Driven Air-Ingress Accident in VHTRs

Description: Air-ingress following the pipe rupture is considered to be the most serious accident in the VHTRs due to its potential problems such as core heat-up, structural integrity and toxic gas release. Previously, it has been believed that the main air-ingress mechanism of this accident is the molecular diffusion process between the reactor core and the cavity. However, according to some recent studies, there is another fast air-ingress process that has not been considered before. It is called density-… more
Date: November 1, 2008
Creator: Kim, Eung Soo; Oh, Chang; Schultz, Richard & Petti, David
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

Pacific Northwest National Laboratory Facility Radionuclide Emissions Units and Sampling Systems

Description: Battelle-Pacific Northwest Division operates numerous research and development (R and D) laboratories in Richland, WA, including those associated with Pacific Northwest National Laboratory (PNNL) on the U.S. Department of Energy (DOE)'s Hanford Site and PNNL Site that have the potential for radionuclide air emissions. The National Emission Standard for Hazardous Air Pollutants (NESHAP 40 CFR 61, Subparts H and I) requires an assessment of all emission units that have the potential for radionucl… more
Date: April 1, 2012
Creator: Barnett, J. M.; Brown, Jason H. & Walker, Brian A.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

COMPARISON OF VENTED AND ABSOLUTE PRESSURE TRANSDUCERS FOR WATER-LEVEL MONITORING IN HANFORD SITE CENTRAL PLATEAU WELLS

Description: Automated water-level data collected using vented pressure transducers deployed in Hanford Site Central Plateau wells commonly display more variability than manual tape measurements in response to barometric pressure fluctuations. To explain this difference, it was hypothesized that vented pressure transducers installed in some wells are subject to barometric pressure effects that reduce water-level measurement accuracy. Vented pressure transducers use a vent tube, which is open to the atmosphe… more
Date: September 8, 2011
Creator: JP, MCDONALD
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Filtration theory using computer simulations

Description: We have used commercially available fluid dynamics codes based on Navier-Stokes theory and the Langevin particle equation of motion to compute the particle capture efficiency and pressure drop through selected two- and three- dimensional fiber arrays. The approach we used was to first compute the air velocity vector field throughout a defined region containing the fiber matrix. The particle capture in the fiber matrix is then computed by superimposing the Langevin particle equation of motion ov… more
Date: January 1997
Creator: Bergman, W. & Corey, I.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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Properties and Cycle Performance of Refrigerant Blends Operating Near and Above the Refrigerant Critical Point, Task 2: Air Conditioner System Study

Description: The main goal of this project was to investigate and compare the performance of an R410A air conditioner to that of an R22 air conditioner, with specific interest in performance at high ambient temperatures at which the condenser of the R410A system may be operating above the refrigerant's critical point. Part 1 of this project consisted of conducting comprehensive measurements of thermophysical for refrigerant R125 and refrigerant blends R410A and R507A and developing new equation of state for… more
Date: October 31, 2002
Creator: Domanski, Piotr A. & Payne, W. Vance
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

New sensor for measurement of low air flow velocity. Phase I final report

Description: The project described here is the Phase I feasibility study of a two-phase program to integrate existing technologies to provide a system for determining air flow velocity and direction in radiation work areas. Basically, a low air flow sensor referred to as a thermocouple flow sensor has been developed. The sensor uses a thermocouple as its sensing element. The response time of the thermocouple is measured using an existing in-situ method called the Loop Current Step Response (LCSR) test. The … more
Date: August 1, 1995
Creator: Hashemian, H.M.; Hashemian, M. & Riggsbee, E.T.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Performance of HEPA filters at LLNL following the 1980 and 1989 earthquakes

Description: The Lawrence Livermore National laboratory has experienced two significant earthquakes for which data is available to assess the ability of HEPA filters to withstand seismic conditions. A 5.9 magnitude earthquake with an epicenter 10 miles from LLNL struck on January 24, 1980. Estimates of the peak ground accelerations ranged from 0.2 to 0.3 g. A 7.0 magnitude earthquake with an epicenter about 50 miles from LLNL struck on October 17, 1989. Measurements of the ground accelerations at LLNL avera… more
Date: November 1, 1994
Creator: Bergman, W.; Elliott, J. & Wilson, K.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

Twenty-third DOE/NRC Nuclear Air Cleaning and Treatment Conference

Description: This paper presents the details of the Nuclear Air Cleaning and Treatment Conference held in Buffalo, New York during July 1994. Topics discussed include: nuclear air cleaning codes and standards; waste disposal; particulate filter developments; sampling and monitoring of process and effluent streams; off-gasses from fuel reprocessing; adsorbents and adsorption; accident control and analysis; revised source terms for power plant accidents; and the highlight of the conference concerned operation… more
Date: March 24, 1995
Creator: Bellamy, R. R.; Hayes, J. J. & First, M. W.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

Source-Term and building-Wake Consequence Modeling for the Godiva IV Reactor at Los Alamos National Laboratory

Description: The objectives of this work were to evaluate the consequences of a postulated accident to onsite security personnel stationed near the facility during operations of the Godiva IV critical assembly and to identify controls needed to protect these personnel in case of an extreme criticality excursion equivalent to the design-basis accident (DBA). This paper presents the methodology and results of the source-term calculations, building ventilation rates, air concentrations, and consequence calcula… more
Date: June 13, 1999
Creator: Letellier, B.C.; McClure, P. & Restrepo, L.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department

[Two pilot seats in a flight simulator]

Description: Photograph of two empty pilot seats in a FlightSafety flight simulator pod. The flight simulator is showing a scene of an approaching city and a large body of water in the background. The control panel of the flight simulator is on and showing flight statistics.
Date: November 14, 2002
Item Type: Refine your search to only Photograph
Partner: UNT Libraries Special Collections
open access

Assessment of the 3430 Building Filtered Exhaust Stack Sampling Probe Location

Description: Pacific Northwest National Laboratory performed a demonstration to determine the acceptable location in which to place an air sampling probe for emissions monitoring for radionuclides in the exhaust air discharge from the new 3430 Building Filtered Exhaust Stack. The method was to adopt the results of a previously performed test series for a system of similar configuration, followed by a partial test on the actual system to verify the applicability of previously performed tests. The qualificati… more
Date: July 16, 2010
Creator: Glissmeyer, John A. & Flaherty, Julia E.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Computational and Experimental Analysis of the Effectiveness of the Argon Reservoir

Description: Experimental and computational studies were performed to evaluate the effectiveness of an Argon Reservoir (AR). The AR is designed to prevent the ingress of air into the extraction furnace during the insertion and removal of the extraction basket, which contains Tritium Producing Burnable Absorber Rods. Computational computer code studies were performed to evaluate the AR design concept. Based on the results of this study it was concluded that the Argon reservoir would be very effective in keep… more
Date: February 11, 2003
Creator: Brizes, W.
Item Type: Refine your search to only Book
Partner: UNT Libraries Government Documents Department

[Three pilots in a flight simulator pod]

Description: Photograph of two pilots and a flight simulator assistant, seated in a FlightSafety simulator pod used by Bell Helicopter Textron employees. The assistant seated in the background of the pod is pointing at one of the computer monitors with the flights statistics.
Date: November 14, 2002
Item Type: Refine your search to only Photograph
Partner: UNT Libraries Special Collections
open access

ARAMS/FRAMES JOINT FREQUENCY DATA (JFD) GENERATOR

Description: An ARAMS/FRAMES utility entitled ''Joint Frequency Data (JFD) Generator'' provides the capability of creating joint frequency tables. The resultant JFD tables contain summaries of the frequency of occurrence of meteorological dispersion, wind speed, and wind direction that are required as input in climatological air dispersion models. The JFD Generator computations are made by an updated version of the EPA STAR (STAbility ARray) program. Surface observations are combined with computed seasonall… more
Date: October 4, 2006
Creator: Droppo, James G. & Pelton, Mitch A.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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