NEW CONTACT BOILING EXPERIMENTS TO EVALUATE CALANDRIA TUBE STRAIN ACCEPTANCE CRITERIA
13th International Conference on CANDU Fuel - 2016 Aug. 15-18


Presented at:
13th International Conference on CANDU Fuel
2016 Aug. 15-18
Location:
Kingston, ON Canada
Session Title:
Session 2: Special Topics

Authors:
A. Viktorov (Canadian Nuclear Safety Commission, Ottawa, Ontario, Canada)
M. El-Hawary (Canadian Nuclear Safety Commission, Ottawa, Ontario, Canada)
A. Tanase (Canadian Nuclear Safety Commission, Ottawa, Ontario, Canada)
  

Abstract

The Canadian Nuclear Safety Commission (CNSC) has contracted Canadian Nuclear Laboratories (CNL) to conduct contact boiling experiments that represent fuel channel behaviour under accident conditions when an overheated Pressure Tube (PT) balloons into contact with the Calandria Tube (CT). Such conditions may occur following a large break loss of coolant accident. The main objective of these experiments was to focus on conditions leading to CT post-contact strain in the range needed to evaluate the acceptance criterion proposed by utilities. Six new experiments labeled Calandria tube Strain Contact Boiling (CSCB) have been conducted resulting in doubling the number of experiments available for verifying the CT strain acceptance criterion. Test conditions were selected using analytical tools with guidance from earlier experiments such as to result in the desired calandria tube strain. This paper presents conditions selected for the CSCB experiments and results obtained. Analysis of main results is also given with focus on the possible existence of non-linear effects for conditions leading to the CT strain above 2%.

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