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Title: Wear measurements of nuclear power plant components. Final report

Abstract

The objective of this study is to measure the amount of cobalt released to the primary coolant by wear of components in the primary circuit of nuclear power plants. Since detailed measurement data prior to wear were not available for field components, the measurements were made relative to nearby unworn reference surfaces. In most cases a profilometer was used to ascertain the worn profiles. Wear of components that were too large to be moved or that were contaminated was measured by preparing plastic replicas of the worn regions for subsequent profilometer measurements. Measurements were performed on the following components: (1) two PWR control element drive mechanisms; (2) a PWR main coolant pump shaft; (3) eight PWR gate valve discs; (4) two PWR horizontal swing check valve bushings; (5) four BWR feedwater regulator valves; (6) a BWR feedwater swing check valve; and (7) two BWR two-stage pilot relief valves. Pre- and post-test weight change measurements also were used to determine the wear of the two control element drive mechanisms. The wear measurements showed that the cobalt release rate varied from 0.02 to 84 grams of cobalt per year.

Authors:
; ; ;
Publication Date:
Research Org.:
Battelle Columbus Labs., OH (USA); Combustion Engineering, Inc., Windsor, CT (USA)
OSTI Identifier:
6816931
Report Number(s):
EPRI-NP-3444
ON: TI84920411
Resource Type:
Technical Report
Country of Publication:
United States
Language:
English
Subject:
21 SPECIFIC NUCLEAR REACTORS AND ASSOCIATED PLANTS; BWR TYPE REACTORS; PRIMARY COOLANT CIRCUITS; REACTOR COMPONENTS; ACTIVITY LEVELS; PWR TYPE REACTORS; WEAR; COBALT ISOTOPES; COOLING SYSTEMS; ENERGY SYSTEMS; ISOTOPES; REACTOR COOLING SYSTEMS; REACTORS; WATER COOLED REACTORS; WATER MODERATED REACTORS; 210100* - Power Reactors, Nonbreeding, Light-Water Moderated, Boiling Water Cooled; 210200 - Power Reactors, Nonbreeding, Light-Water Moderated, Nonboiling Water Cooled

Citation Formats

Dufrane, K F, Young, T R, LaDuca, J T, and Mellor, P L. Wear measurements of nuclear power plant components. Final report. United States: N. p., 1984. Web.
Dufrane, K F, Young, T R, LaDuca, J T, & Mellor, P L. Wear measurements of nuclear power plant components. Final report. United States.
Dufrane, K F, Young, T R, LaDuca, J T, and Mellor, P L. 1984. "Wear measurements of nuclear power plant components. Final report". United States.
@article{osti_6816931,
title = {Wear measurements of nuclear power plant components. Final report},
author = {Dufrane, K F and Young, T R and LaDuca, J T and Mellor, P L},
abstractNote = {The objective of this study is to measure the amount of cobalt released to the primary coolant by wear of components in the primary circuit of nuclear power plants. Since detailed measurement data prior to wear were not available for field components, the measurements were made relative to nearby unworn reference surfaces. In most cases a profilometer was used to ascertain the worn profiles. Wear of components that were too large to be moved or that were contaminated was measured by preparing plastic replicas of the worn regions for subsequent profilometer measurements. Measurements were performed on the following components: (1) two PWR control element drive mechanisms; (2) a PWR main coolant pump shaft; (3) eight PWR gate valve discs; (4) two PWR horizontal swing check valve bushings; (5) four BWR feedwater regulator valves; (6) a BWR feedwater swing check valve; and (7) two BWR two-stage pilot relief valves. Pre- and post-test weight change measurements also were used to determine the wear of the two control element drive mechanisms. The wear measurements showed that the cobalt release rate varied from 0.02 to 84 grams of cobalt per year.},
doi = {},
url = {https://www.osti.gov/biblio/6816931}, journal = {},
number = ,
volume = ,
place = {United States},
year = {Tue May 01 00:00:00 EDT 1984},
month = {Tue May 01 00:00:00 EDT 1984}
}

Technical Report:
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