The effect of crack length on SIF and elastic COD for elbow with circumferential through wall crack
Many damages due to flow-accelerated corrosion and cracking have been observed during recent in-service inspections of nuclear power plants. To determine the operability or repair for damaged pipes, an integrity evaluation related to the damaged piping system should be performed by using already pro...
| Main Authors: | , , , |
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| Format: | Article |
| Language: | English |
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Elsevier
2020-09-01
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| Series: | Nuclear Engineering and Technology |
| Subjects: | |
| Online Access: | http://www.sciencedirect.com/science/article/pii/S1738573319309829 |
| _version_ | 1818410048005603328 |
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| author | Min Kyu Kim Jun Hyeok Jeon Jae Boong Choi Moon Ki Kim |
| author_facet | Min Kyu Kim Jun Hyeok Jeon Jae Boong Choi Moon Ki Kim |
| author_sort | Min Kyu Kim |
| collection | DOAJ |
| description | Many damages due to flow-accelerated corrosion and cracking have been observed during recent in-service inspections of nuclear power plants. To determine the operability or repair for damaged pipes, an integrity evaluation related to the damaged piping system should be performed by using already proven code and standards. One of them, the ASME Code Case is most popularly used to integrity assessment in nuclear power plants. However, the recent version of CC N-513 still recommends the simplified method which means a damaged elbow is assumed as an equivalent straight pipe. In addition, to enhance the accuracy integrity assessment in elbow, several previous studies recommend that the SIF and elastic COD values for an elbow with relatively large crack could be predicted by an interpolation technique. However, those estimates for elbow with relatively large crack might be derived to inaccurate results for crack growth analysis, such as for the allowable crack size and life estimation. Therefore, in this paper, the effect of crack length (0.3≤θ1/π ≤ 0.5) on SIF and elastic COD for elbow is systematically investigated. Then, for large crack in elbow, accurate estimates for SIF and elastic COD, which are widely used to assess the integrity of elbows, are proposed. Those proposed solutions are expected to be the technical basis for revisions of CC N-513-4 through the validation. |
| first_indexed | 2024-12-14T10:09:19Z |
| format | Article |
| id | doaj.art-67f2993302f64e678d3d42527a6272ee |
| institution | Directory Open Access Journal |
| issn | 1738-5733 |
| language | English |
| last_indexed | 2024-12-14T10:09:19Z |
| publishDate | 2020-09-01 |
| publisher | Elsevier |
| record_format | Article |
| series | Nuclear Engineering and Technology |
| spelling | doaj.art-67f2993302f64e678d3d42527a6272ee2022-12-21T23:07:02ZengElsevierNuclear Engineering and Technology1738-57332020-09-0152920922099The effect of crack length on SIF and elastic COD for elbow with circumferential through wall crackMin Kyu Kim0Jun Hyeok Jeon1Jae Boong Choi2Moon Ki Kim3Affiliation: School of Mechanical Engineering, Sungkyunkwan University Full Mailing, 300 Cheoncheon, Suwon, 440-746, South KoreaAffiliation: School of Mechanical Engineering, Sungkyunkwan University Full Mailing, 300 Cheoncheon, Suwon, 440-746, South KoreaAffiliation: School of Mechanical Engineering, Sungkyunkwan University Full Mailing, 300 Cheoncheon, Suwon, 440-746, South KoreaCorresponding author.; Affiliation: School of Mechanical Engineering, Sungkyunkwan University Full Mailing, 300 Cheoncheon, Suwon, 440-746, South KoreaMany damages due to flow-accelerated corrosion and cracking have been observed during recent in-service inspections of nuclear power plants. To determine the operability or repair for damaged pipes, an integrity evaluation related to the damaged piping system should be performed by using already proven code and standards. One of them, the ASME Code Case is most popularly used to integrity assessment in nuclear power plants. However, the recent version of CC N-513 still recommends the simplified method which means a damaged elbow is assumed as an equivalent straight pipe. In addition, to enhance the accuracy integrity assessment in elbow, several previous studies recommend that the SIF and elastic COD values for an elbow with relatively large crack could be predicted by an interpolation technique. However, those estimates for elbow with relatively large crack might be derived to inaccurate results for crack growth analysis, such as for the allowable crack size and life estimation. Therefore, in this paper, the effect of crack length (0.3≤θ1/π ≤ 0.5) on SIF and elastic COD for elbow is systematically investigated. Then, for large crack in elbow, accurate estimates for SIF and elastic COD, which are widely used to assess the integrity of elbows, are proposed. Those proposed solutions are expected to be the technical basis for revisions of CC N-513-4 through the validation.http://www.sciencedirect.com/science/article/pii/S1738573319309829Circumferential though-wall crackCrack lengthElbowFinite element analysisStress intensity factorElastic crack opening displacement |
| spellingShingle | Min Kyu Kim Jun Hyeok Jeon Jae Boong Choi Moon Ki Kim The effect of crack length on SIF and elastic COD for elbow with circumferential through wall crack Nuclear Engineering and Technology Circumferential though-wall crack Crack length Elbow Finite element analysis Stress intensity factor Elastic crack opening displacement |
| title | The effect of crack length on SIF and elastic COD for elbow with circumferential through wall crack |
| title_full | The effect of crack length on SIF and elastic COD for elbow with circumferential through wall crack |
| title_fullStr | The effect of crack length on SIF and elastic COD for elbow with circumferential through wall crack |
| title_full_unstemmed | The effect of crack length on SIF and elastic COD for elbow with circumferential through wall crack |
| title_short | The effect of crack length on SIF and elastic COD for elbow with circumferential through wall crack |
| title_sort | effect of crack length on sif and elastic cod for elbow with circumferential through wall crack |
| topic | Circumferential though-wall crack Crack length Elbow Finite element analysis Stress intensity factor Elastic crack opening displacement |
| url | http://www.sciencedirect.com/science/article/pii/S1738573319309829 |
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