Life Time Estimation for Cladding Tube Cracking Caused by Absorber Swelling of PWR RCCA Rodlets.
-
- MATSUOKA Takanori
- Experiment Department, Nuclear Development Corporation
-
- YONEZAWA Toshio
- Takasago Research & Development Center, Mitsubishi Heavy Industries, Ltd.
-
- NAKAMURA Kazuhiro
- Takasago Research & Development Center, Mitsubishi Heavy Industries, Ltd.
-
- MURAKAMI Kazuo
- Kobe Shipyard & Machinery Works, Mitsubishi Heavy Industries, Ltd.
-
- SHIMIZU Juntarou
- Kobe Shipyard & Machinery Works, Mitsubishi Heavy Industries, Ltd.
-
- NAGATA Tadahisa
- General Office of Nuclear and Fossil Power Production, The Kansai Electric Power Co., Inc.
Bibliographic Information
- Other Title
-
- Life Time Estimation for Cladding Tube
Search this article
Abstract
Intergranular cracks of cladding tubes had been observed at the tips of the rodlets of PWR rod cluster control assemblies (RCCAs). Because RCCAs are important core components, an investigation was carried out to estimate their service life time.<BR>(1) As it is essential to know the effect of slumping of the neutron absorber for the life time estimation, tests on absorber material were carried out. Both the dynamic and static stresses of the absorber are sufficiently small compared with its mechanical characteristics and it is concluded that slumping does not occur.<BR>(2) The crack was initiated at the inner surface of the cladding tubes and Sipush et al. obtained an intergranular fracture surface in tensile tests of similar material at a very slow strain rate in an argon gas atmosphere. Therefore the mechanism of the intergranular crack of the cladding tube is not IASCC but irradiation assisted cracking (IAC) caused by an increase in hoop strain due to the swelling of the absorber and a decrease in elongation due to neutron irradiation.<BR>(3) The crack initiation limit of cylindrical shells made of low ductile material and subjected to internal pressure is determined in relation to the uniform strain of the material and is in accordance with that of the RCCA rodlets in an actual plant.<BR>From the above investigation, the method of estimating the life time and countermeasures for its extension are obtained.
Journal
-
- Journal of Nuclear Science and Technology
-
Journal of Nuclear Science and Technology 35 (8), 564-578, 1998
Atomic Energy Society of Japan
- Tweet
Keywords
Details
-
- CRID
- 1390001204094897280
-
- NII Article ID
- 10002079880
-
- NII Book ID
- AA00703720
-
- COI
- 1:CAS:528:DyaK1cXmsVegsL8%3D
-
- ISSN
- 18811248
- 00223131
-
- NDL BIB ID
- 4541363
-
- Text Lang
- en
-
- Data Source
-
- JaLC
- NDL
- Crossref
- CiNii Articles
-
- Abstract License Flag
- Disallowed