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Boiling Water Reactor Steam Dryer Alternating Stress Assessment Procedures

[+] Author and Article Information
Stephen A Hambric

Fellow of ASME, ARL/Penn State, PO Box 30, State College, PA 16804
sah19@arl.psu.edu

Samir Ziada

Fellow of ASME, McMaster University, Department of Mechanical Engineering, Hamilton, Ontario, Canada, L8S 4L7
ziadas@mcmaster.ca

Richard Morante

Brookhaven National Lab
morante@bnl.gov

1Corresponding author.

ASME doi:10.1115/1.4037898 History: Received June 09, 2017; Revised September 01, 2017

Abstract

The United States Nuclear Regulatory Commission (USNRC) has approved several Extended Power Uprates (EPU) for Boiling Water Reactors (BWRs). In some of the BWRs, operating at the higher EPU power levels and flow rates led to fatigue damage of Steam Dryers, including the generation of loose parts. Since those failures occured all BWR owners proposing EPUs have been required by the USNRC to ensure that the steam dryers would not experience fatigue cracking. This paper provides an overview of BWR steam dryer design; the fatigue failures that occurred at the Quad Cities (QC) nuclear power plants and their root causes; a brief history of BWR EPUs; and a discussion of steam dryer modifications/replacements, alternating stress mechanisms on steam dryers, and structural integrity evaluation methods (static and alternating stress).

Section 3: U.S. Gov Contractors
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