Author: DeGraff, B.
Paper Title Page
WEPA32 Spallation Neutron Source Cryogenic Moderator System Helium Gas Analysis System 699
  • B. DeGraff, L. Pinion
    ORNL RAD, Oak Ridge, Tennessee, USA
  • R. Armstrong, J. Denison, M.P. Howell, S.-H. Kim, D. Montierth
    ORNL, Oak Ridge, Tennessee, USA
  • M.D. Williamson
    LBNL, Berkeley, California, USA
  Funding: This work was supported by SNS through UT-Battelle, LLC, under contract DE-AC05-00OR22725 for the U.S. DOE.
The Spallation Neutron Source (SNS) at Oak Ridge National Laboratory (ORNL) operates the Cryogenic Moderator System (CMS). The CMS comprises a 20-K helium refrigerator and three helium to hydrogen heat exchangers in support of hydrogen cooled spallation moderation vessels. This system uses vessels filled with activated carbon as the final major component to remove oil vapor from the compressed helium in the cryogenic cold box. SNS uses a LINDE multi-component gas analyzer to detect the presence of contaminants in the warm helium flow upstream of the cold box including aerosolized oil vapor. The design challenges of installing and operating this analyzer on the CMS system due to normal system operating pressures will be discussed. The design, fabrication, installation, commissioning, and initial results of this system operation will be presented. Future upgrades to the analyzer system will also be discussed.
DOI • reference for this paper ※ doi:10.18429/JACoW-NAPAC2022-WEPA32  
About • Received ※ 06 August 2022 — Revised ※ 08 August 2022 — Accepted ※ 11 August 2022 — Issue date ※ 05 October 2022
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