Full Content is available to subscribers

Subscribe/Learn More  >

Fitness-for-Service Assessment of Calandria Tube to Liquid Injection Shutdown System Nozzle Contact in a CANDU Reactor

[+] Author Affiliations
Cheng Liu, Eric Tulk, Douglas Scarth

Kinectrics Inc., Toronto, ON, Canada

Larry Micuda

Bruce Power L.P., Toronto, ON, Canada

Paper No. PVP2016-63989, pp. V06AT06A072; 13 pages
  • ASME 2016 Pressure Vessels and Piping Conference
  • Volume 6A: Materials and Fabrication
  • Vancouver, British Columbia, Canada, July 17–21, 2016
  • Conference Sponsors: Pressure Vessels and Piping Division
  • ISBN: 978-0-7918-5042-8
  • Copyright © 2016 by ASME


In CANDU1 reactors, calandria tubes are used to separate the fuel channels from the moderator. The Liquid Injection Shutdown System (LISS) nozzles, which contain holes for discharging neutron-absorbing liquid into the moderator, are arranged perpendicularly in the gap between adjacent rows of calandria tubes. Both calandria tubes and LISS nozzles sag during service due to creep, with the more heavily loaded calandria tubes sagging relatively more. When contact between a calandria tube and a LISS nozzle has been detected by in-service inspection, or is predicted to occur, a fitness-for-service assessment is permitted by CSA Standard N285.4 to demonstrate acceptability of continued operation until the end of the next periodic inspection interval, provided that the fitness-for-service assessment is acceptable to the Regulatory Authority. A fitness-for-service assessment has been recently performed for a calandria tube and a LISS nozzle that were predicted to contact at a future time. The assessment has demonstrated that for an evaluation period of three years after the predicted contact time, the structural integrity of the calandria tube and the LISS nozzle is maintained, both components will continue to function in accordance with their design requirements, and their contact will not result in contact between the calandria tube and a pressure tube.

Copyright © 2016 by ASME



Interactive Graphics


Country-Specific Mortality and Growth Failure in Infancy and Yound Children and Association With Material Stature

Use interactive graphics and maps to view and sort country-specific infant and early dhildhood mortality and growth failure data and their association with maternal

Citing articles are presented as examples only. In non-demo SCM6 implementation, integration with CrossRef’s "Cited By" API will populate this tab (http://www.crossref.org/citedby.html).

Some tools below are only available to our subscribers or users with an online account.

Related Content

Customize your page view by dragging and repositioning the boxes below.

Related eBook Content
Topic Collections

Sorry! You do not have access to this content. For assistance or to subscribe, please contact us:

  • TELEPHONE: 1-800-843-2763 (Toll-free in the USA)
  • EMAIL: asmedigitalcollection@asme.org
Sign In