Search


Information
ICMST-Shenzhen 2016
Nov 1 - 4, 2016
Shenzhen, China
(EXIT THIS PAGE)
ICMST-Kobe 2014
Nov 2(Sun) - 5(Wed), 2014
Kobe, Japan
Nuclear Regulation Authority Outline of the New Safety Standards for Light Water Reactors for Electric Power Generation
For Public Comment
Outline of New Safety Standard (Design Basis)
For Public Comment
New Safety Standards (SA) Outline (Draft)
For Public Comment
Outline of New Safety Standard(Earthquake and Tsunami)(DRAFT)
Issues
 

Vol.8 No.2(Aug-25)
Vol.8 No.1(May-25)
Vol.7 No.4(Feb-25)
Vol.7 No.3(Nov-25)
Vol.7 No.2(Aug-25)
Vol.7 No.1(May-25)

< Other Issues

 

Occasional Topics
OTjapan Measures for Tsunami Striking Nuclear Power Station in Japan
Special Article: The Great Tohoku Earthquake (1)
OTjapan The Tragedy of “To Be” Principle in the Japanese Nuclear Industry
EJAMOT_CN3_Figure1_The_outside_view_of_CEFR OTChinaPlanning and Consideration on SFR R&D Activities in China
< All Occasional Topics

Featured Articles
EJAM7-3NT72 A New Mechanical Condition-based Maintenance Technology Using Instrumented Indentation Technique
EJAM7-3NT73 Survey robots for Fukushima Daiichi Nuclear Power Plant

JSM
Contacts
(EJAM): ejam@jsm.or.jp
(JSM): secretariat@jsm.or.jp
HP: http://www.jsm.or.jp
(in English)

 

Vol.9 No.2previous AASP17 (125-126-127-128-129-130-131-132-133-134-135-136-137-138-139-140-141-142) NT85

Academic Articles
Regular Paper Vol.9 No.2 (2017) p.118- p.125
 

Performance Based Maintenance Concept to Optimize Inspection Schedule

 
Masayuki KAMAYA1,*
 

1 Institute of Nuclear Safety System, Inc., 64 Sata, Mihama-cho, Fukui 919-1205, Japan

 
Abstract
This study is aimed at proposing a new maintenance concept; performance based maintenance (PBM). In a flaw tolerance assessment, time duration until the next inspection is determined by crack growth prediction assuming material degradation such as stress corrosion cracking and fatigue. In most cases, the crack growth prediction is excessively conservative and no cracking is found by inspections. The fact of no indication by inspections implies that cracks have not grown to more than a detectable size for the inspection technique applied. In the PBM concept, this inspection result is considered in determining the next inspection schedule. In this study, applicability of the PBM concept was shown for fatigue degradation of stainless steel components in a pressurized water reactor primary water environment. The relationship between crack depth and number of cycles obtained in the author’s previous study was used for the crack growth prediction. Then, crack growth for a postulated fatigue crack was predicted considering strain gradient in the depth direction caused by thermal loading. It was shown that the duration until the next inspection could be optimized based on the inspection result together with the crack growth curve. A longer operation time before the inspection resulted in a longer duration until the next inspection.
 
Keywords
Performance-based maintenance, fatigue, crack growth, maintenance, inspection schedule
 
Full Paper: PDF
Article Information
Article history:
Received 6 November 2016
Accepted 27 April 2017