Author:
Publisher:
ISBN:
Category : Liquid hydrogen
Languages : en
Pages : 72
Book Description
Nearly two-thirds of the experiments performed at the NIST Center for Neutron Research (NCNR) utilize cold neutrons with wavelengths greater than 4 Angstroms. This report documents the development of the liquid hydrogen cold neutron source in the NIST research reactor. The source was designed to optimize the flux of cold neutrons transported to the scattering instruments in the guide hall. It was also designed to be passively safe, and operate simply and reliably. All hydrogen system components are surrounded with monitored helium containments to ensure that there are at least two barriers between the hydrogen and the atmosphere. Monte Carlo simulations were used to calculate the cold source performance and estimate the nuclear heat load at full reactor power. Thermal-hydraulic tests in a full-scale mockup at NIST Boulder confirmed that a naturally circulating thermosiphon driven by the 2 meter height of the condenser could easily supply the moderator vessel with liquid hydrogen while removing over 2000 watts. The cryostat assembly was designed to withstand any high pressure generated in a credible accident. It was fabricated to rigorous quality assurance standards, resulting in over 10 years of leak-free operation.
NIST Liquid Hydrogen Cold Source
Author:
Publisher:
ISBN:
Category : Liquid hydrogen
Languages : en
Pages : 72
Book Description
Nearly two-thirds of the experiments performed at the NIST Center for Neutron Research (NCNR) utilize cold neutrons with wavelengths greater than 4 Angstroms. This report documents the development of the liquid hydrogen cold neutron source in the NIST research reactor. The source was designed to optimize the flux of cold neutrons transported to the scattering instruments in the guide hall. It was also designed to be passively safe, and operate simply and reliably. All hydrogen system components are surrounded with monitored helium containments to ensure that there are at least two barriers between the hydrogen and the atmosphere. Monte Carlo simulations were used to calculate the cold source performance and estimate the nuclear heat load at full reactor power. Thermal-hydraulic tests in a full-scale mockup at NIST Boulder confirmed that a naturally circulating thermosiphon driven by the 2 meter height of the condenser could easily supply the moderator vessel with liquid hydrogen while removing over 2000 watts. The cryostat assembly was designed to withstand any high pressure generated in a credible accident. It was fabricated to rigorous quality assurance standards, resulting in over 10 years of leak-free operation.
Publisher:
ISBN:
Category : Liquid hydrogen
Languages : en
Pages : 72
Book Description
Nearly two-thirds of the experiments performed at the NIST Center for Neutron Research (NCNR) utilize cold neutrons with wavelengths greater than 4 Angstroms. This report documents the development of the liquid hydrogen cold neutron source in the NIST research reactor. The source was designed to optimize the flux of cold neutrons transported to the scattering instruments in the guide hall. It was also designed to be passively safe, and operate simply and reliably. All hydrogen system components are surrounded with monitored helium containments to ensure that there are at least two barriers between the hydrogen and the atmosphere. Monte Carlo simulations were used to calculate the cold source performance and estimate the nuclear heat load at full reactor power. Thermal-hydraulic tests in a full-scale mockup at NIST Boulder confirmed that a naturally circulating thermosiphon driven by the 2 meter height of the condenser could easily supply the moderator vessel with liquid hydrogen while removing over 2000 watts. The cryostat assembly was designed to withstand any high pressure generated in a credible accident. It was fabricated to rigorous quality assurance standards, resulting in over 10 years of leak-free operation.
The Liquid Hydrogen Moderator at the NIST Research Reactor
Author:
Publisher:
ISBN:
Category :
Languages : en
Pages : 8
Book Description
In 1995, the NIST research reactor was shut down for a number of modifications, including the replacement of the D2O cold neutron source with a liquid hydrogen moderator. When the liquid hydrogen source began operating, the flux of cold neutrons increased by a factor of six over the D2O source. The design and operation of the hydrogen source are described, and measurements of its performance are compared with the Monte Carlo simulations used in the design. (auth).
Publisher:
ISBN:
Category :
Languages : en
Pages : 8
Book Description
In 1995, the NIST research reactor was shut down for a number of modifications, including the replacement of the D2O cold neutron source with a liquid hydrogen moderator. When the liquid hydrogen source began operating, the flux of cold neutrons increased by a factor of six over the D2O source. The design and operation of the hydrogen source are described, and measurements of its performance are compared with the Monte Carlo simulations used in the design. (auth).
NIST Technical Note
Author:
Publisher:
ISBN:
Category : Physical instruments
Languages : en
Pages : 520
Book Description
Publisher:
ISBN:
Category : Physical instruments
Languages : en
Pages : 520
Book Description
NIST Special Publication
Author:
Publisher:
ISBN:
Category : Weights and measures
Languages : en
Pages : 82
Book Description
Publisher:
ISBN:
Category : Weights and measures
Languages : en
Pages : 82
Book Description
NISTIR.
Author:
Publisher:
ISBN:
Category :
Languages : en
Pages : 78
Book Description
Publisher:
ISBN:
Category :
Languages : en
Pages : 78
Book Description
Materials Science and Engineering Laboratory
Author:
Publisher:
ISBN:
Category : Materials science
Languages : en
Pages : 32
Book Description
Publisher:
ISBN:
Category : Materials science
Languages : en
Pages : 32
Book Description
Selected Properties of Hydrogen (engineering Design Data)
Author: Robert D. McCarty
Publisher:
ISBN:
Category : Hydrogen
Languages : en
Pages : 540
Book Description
Publisher:
ISBN:
Category : Hydrogen
Languages : en
Pages : 540
Book Description
Journal of Research of the National Institute of Standards and Technology
Author:
Publisher:
ISBN:
Category : Measurement
Languages : en
Pages : 382
Book Description
Publisher:
ISBN:
Category : Measurement
Languages : en
Pages : 382
Book Description
Commerce, Justice, Science, and Related Agencies Appropriations for Fiscal Year 2007
Author: United States. Congress. Senate. Committee on Appropriations. Subcommittee on Commerce, Justice, Science, and Related Agencies
Publisher:
ISBN:
Category : United States
Languages : en
Pages : 2068
Book Description
Publisher:
ISBN:
Category : United States
Languages : en
Pages : 2068
Book Description
Publications of the National Institute of Standards and Technology ... Catalog
Author: National Institute of Standards and Technology (U.S.)
Publisher:
ISBN:
Category :
Languages : en
Pages : 1162
Book Description
Publisher:
ISBN:
Category :
Languages : en
Pages : 1162
Book Description