Evaluation of PWSCC at dissimilar metal butt welds in NPP
- 1. KHNP Central Research Institute, Daejeon (Korea, Republic of)
- 2. Korea Univ., Seoul (Korea, Republic of)
Description
Primary water stress corrosion cracking (PWSCC) instances have been reported in the Alloy 600 reactor pressure vessel head penetration nozzle and the Alloy 82/182 dissimilar metal butt weld nozzle in several PWRs. Therefore, in service inspection programs have been adopted worldwide to prevent failure at the weld region. If a PWSCC is observed at the dissimilar metal weld region during inspection, its structural integrity should be evaluated; however, this requires considerable time and effort, and this might lead to a decrease in the plant utilization coefficient. To prevent this, KHNP CRI have established integrity assessment criteria and developed a computer program for the fast evaluation and judgment of PWSCC. In this paper, the results and current status of the same are presented. Through this study, criteria for the structural integrity evaluation of PWSCC have been established, and a computer program has been developed to realize technical means for the evaluation of PWSCC structural integrity
Additional details
Publishing Information
- Journal Title
- Transactions of the Korean Society of Mechanical Engineers. A
- Journal Volume
- 36
- Journal Issue
- 9
- Series
- 7 refs, 8 figs, 3 tabs
- Journal Page Range
- p. 1047-1052
- ISSN
- 1226-4873
INIS
- Country of Publication
- Korea, Republic of
- Country of Input or Organization
- Korea, Republic of
- INIS RN
- 44072468
- Subject category
- S21: SPECIFIC NUCLEAR REACTORS AND ASSOCIATED PLANTS;
- Descriptors DEI
- CRACKING; FAILURES; INCONEL 600; IN-SERVICE INSPECTION; NOZZLES; NUCLEAR POWER PLANTS; PRESSURE VESSELS; PWR TYPE REACTORS; REACTOR VESSELS; STRESS CORROSION; WELDED JOINTS
- Descriptors DEC
- ALLOY-NI76CR15FE8; ALLOYS; ALUMINIUM ADDITIONS; ALUMINIUM ALLOYS; CHEMICAL REACTIONS; CHROMIUM ALLOYS; CONTAINERS; CORROSION; CORROSION RESISTANT ALLOYS; DECOMPOSITION; ENRICHED URANIUM REACTORS; HEAT RESISTANT MATERIALS; HEAT RESISTING ALLOYS; INCONEL ALLOYS; INSPECTION; IRON ALLOYS; JOINTS; MATERIALS; NICKEL ALLOYS; NICKEL BASE ALLOYS; NIMONIC; NUCLEAR FACILITIES; POWER PLANTS; POWER REACTORS; PYROLYSIS; REACTORS; THERMAL POWER PLANTS; THERMAL REACTORS; THERMOCHEMICAL PROCESSES; TITANIUM ADDITIONS; TITANIUM ALLOYS; TRANSITION ELEMENT ALLOYS; WATER COOLED REACTORS; WATER MODERATED REACTORS