Skip to main content
SpringerLink
Log in

Safety Analysis Results for Cryostat Ingress Accidents in ITER

  • Published:
Journal of Fusion Energy Aims and scope Submit manuscript

Abstract

Accidents involving the ingress of air, helium, or water into the cryostat of the International Thermonuclear Experimental Reactor (ITER) tokamak design have been analyzed with a modified version of the MELCOR code for the ITER Non-site Specific Safety Report (NSSR-1). The air ingress accident is the result of a postulated breach of the cryostat boundary into an adjoining room. MELCOR results for this accident demonstrate that the condensed air mass and increased heat loads are not a magnet safety concern, but that the partial vacuum in the adjoining room must be accommodated in the building design. The water ingress accident is the result of a postulated magnet arc that results in melting of a Primary Heat Transport System (PHTS) coolant pipe, discharging PHTS water and PHTS water activated corrosion products and HTO into the cryostat. MELCOR results for this accident demonstrate that the condensed water mass and increased heat loads are not a magnet safety concern, that the cryostat pressure remains below design limits, and that the corrosion product and HTO releases are well within the ITER release limits.

This is a preview of subscription content, log in via an institution to check access.

Access this article

Log in via an institution

Price excludes VAT (USA)
Tax calculation will be finalised during checkout.

Instant access to the full article PDF.

Institutional subscriptions

Similar content being viewed by others

REFERENCES

  1. H.-W. Bartels (ed.) (1996). Accident Analysis Specifications for NSSR-1 (AAS). Version 1.2, S 81 RE 4 96-03-12 W1.1, SEHD 8.1.C-1, May 31.

  2. R. M. Summers et al. (1991). MELCOR 1.8.0: A Computer Code for Severe Nuclear Reactor Accident Source Term and Risk Assessment Analyses. NUREG/CR-5531, Sandia National Laboratories report SAND-90-0364, January.

  3. B. J. Merrill and D. L. Hagrman (1996). MELCOR Aerosol Transport Module Modifications for NSSR-1. ITER/US/96/TE/SA-03, U.S. Home Team, February 21.

  4. B. J. Merrill (1995). Initial Modifications to the MELCOR Code. ITER/US/95/TE/SA-18, U.S. Home Team, June 30.

  5. H.-W. Bartels (ed.) (1996). Safety Analysis Data List (SADL). Version 1.2, S 81 RE 3 96-03-05 W1.1, SEHD 8.1.C-1, May 31.

  6. A. E. Poucet et al. (1996). Safety Analysis Guidelines for NSSR-1. Version 1.1, S 81 RI 1 95-12-13 W2, SEHD 8.1.C-1, March.

Download references

Author information

Authors and Affiliations

  1. Fusion Safety Program Idaho National Engineering Laboratory, P.O. Box 1625, Idaho Falls, Idaho, 83415-3815

    B. J. Merrill, L. C. Cadwallader & D. A. Petti

Authors
  1. B. J. Merrill
    View author publications

    You can also search for this author in PubMed Google Scholar

  2. L. C. Cadwallader
    View author publications

    You can also search for this author in PubMed Google Scholar

  3. D. A. Petti
    View author publications

    You can also search for this author in PubMed Google Scholar

Rights and permissions

Reprints and permissions

About this article

Cite this article

Merrill, B.J., Cadwallader, L.C. & Petti, D.A. Safety Analysis Results for Cryostat Ingress Accidents in ITER. Journal of Fusion Energy 16, 119–124 (1997). https://doi.org/10.1023/A:1022577332483

Download citation

  • Issue Date:

  • DOI: https://doi.org/10.1023/A:1022577332483

Search

Navigation