Verification of criticality accident alarm system detector locations for the X-326 process cell floor

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Criticality Accident Alarm System (CAAS) detectors on the cell floor of the X-326 process building at the Portsmouth Gaseous Diffusion Plant (PORTS) are located at a height of 5 m above the cell floor. It has been suggested that this height be lowered to I m to alleviate accelerated system failures caused by the elevated temperatures at 5 m and to reduce the frequency of injury to maintenance personnel lifting the approximately 90-lb units into position. Work has been performed which analyzed the effect of relocating the CAAS detectors on the process floors of the X-333 and X-330 buildings from ... continued below

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70 p.

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Dobelbower, M.C.; Woollard, J.; Lee, B.L. Jr. & Tayloe, R.W. Jr. August 1, 1995.

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Description

Criticality Accident Alarm System (CAAS) detectors on the cell floor of the X-326 process building at the Portsmouth Gaseous Diffusion Plant (PORTS) are located at a height of 5 m above the cell floor. It has been suggested that this height be lowered to I m to alleviate accelerated system failures caused by the elevated temperatures at 5 m and to reduce the frequency of injury to maintenance personnel lifting the approximately 90-lb units into position. Work has been performed which analyzed the effect of relocating the CAAS detectors on the process floors of the X-333 and X-330 buildings from their current height to a height of 1 m{sup 1}. This earlier work was based on criticality accidents occurring in low enriched material (5% {sup 235}U) and was limited to the X-333 and X-330 buildings and the low enriched areas of X-326. It did not consider the residual higher enriched material in the X-326 building. This report analyzes the effect on criticality alarm coverage of lowering the CAAS detectors. This analysis is based on criticality accidents resulting from higher enriched material which may be present as ``hold-up`` in the process equipment within the X-326 building. The criticality accident alarm detectors at the PORTS facility are set to alarm at a neutron absorbed dose rate of 5 mrad/hr. The calculated absorbed dose rates presented in this report show that the detectors examined that produce an alarm for the given criticality event at their current height will also produce an alarm if located at a height of 1 meter. Therefore, lowering the detectors will not result in a loss of coverage within the building.

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70 p.

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INIS; OSTI as DE95017168

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  • Other Information: PBD: Aug 1995

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  • Other: DE95017168
  • Report No.: POEF-SH--34
  • Grant Number: AC05-76OR00001
  • DOI: 10.2172/110805 | External Link
  • Office of Scientific & Technical Information Report Number: 110805
  • Archival Resource Key: ark:/67531/metadc622441

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Office of Scientific & Technical Information Technical Reports

Reports, articles and other documents harvested from the Office of Scientific and Technical Information.

Office of Scientific and Technical Information (OSTI) is the Department of Energy (DOE) office that collects, preserves, and disseminates DOE-sponsored research and development (R&D) results that are the outcomes of R&D projects or other funded activities at DOE labs and facilities nationwide and grantees at universities and other institutions.

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Creation Date

  • August 1, 1995

Added to The UNT Digital Library

  • June 16, 2015, 7:43 a.m.

Description Last Updated

  • Nov. 30, 2015, 1 p.m.

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Dobelbower, M.C.; Woollard, J.; Lee, B.L. Jr. & Tayloe, R.W. Jr. Verification of criticality accident alarm system detector locations for the X-326 process cell floor, report, August 1, 1995; United States. (digital.library.unt.edu/ark:/67531/metadc622441/: accessed October 15, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.