Prediction of Axial and Radial Creep in Pressure Tubes

Closed for proposals

Project Type

Coordinated Research Project

Project Code

I31023

CRP

1895

Approved Date

19 April 2012

Status

4 - Closed

Start Date

30 October 2012

Expected End Date

30 October 2017

Completed Date

29 November 2018

Participating Countries

Argentina
Canada
China
India
Republic of Korea
Romania

Description

Pressure tube deformation is a critical ageing issue in operating heavy water reactors (HWRs). Depending on the years of service, horizontal pressure tubes may show one of three kinds of deformation: diametral creep leading to coolant flow bypass in the fuel bundles and a related penalty to the critical heat flux for fuel rods; longitudinal creep leading to disruption of the feeder pipes and/or the fuelling machine; and sagging leading to interference with in-core components and potential contact between the pressure tube and calandria tube. The CRP scope includes the establishment of a database for pressure tube deformation, microstructure characterization of pressure tube materials collected from HWRs currently operating in Member States, and development of a prediction model for pressure tube deformation. The CRP has been planned on the advice and with the support of the IAEA Department of Nuclear Energy’s Technical Working Group on Advanced Technologies for Heavy Water Reactors. The CRP is conducted by the Nuclear Power Technology Development Section within the Department of Nuclear Energy.

Objectives

To promote international collaboration among IAEA Member States through the sharing the data and participating in the development of prediction model and microstructure characterization of pressure tube materials for operating heavy water reactors.

Specific objectives

To improve safety for currently operating plants and to facilitate more economic and safe designs for future plants

To improve safety for currently operating plants and to facilitate more economic and safe designs for future plants

Impact

The CRP included the establishment of a database for pressure tube deformation, microstructure characterization of pressure tube materials collected from heavy water reactors currently operating in Member States and assessments of prediction models for radial pressure tube deformation.

Relevance

This CRP, recommended at the Technical Working Group on Advanced Technologies for HWRs (TWG–HWR) meeting held on 26–28 July 2011 and developed during a Technical Meeting on 16–18 November 2011, aimed at establishing a database for in–reactor pressure tube deformation, microstructure characterization of pressure tube materials collected from HWRs currently operating in Member States and the development of improved prediction models for pressure tube deformation; and generated new knowledge supporting:
1. Establishment of the first all inclusive international database of in reactor measurements of the pressure tube diametral creep;
2. Microstructure characterization of pressure tube material coupons collected from currently operating HWRs;
3. Development of prediction models or methods for pressure tube deformation.

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