Stichting Laka

Event Report Forms (ERFs) are filed to the IAEA. Sometimes there are multiple event reports, updating the rating, the event description. Here you only see the latest event report

ERF send date: Thu, 25-03-1993
ERF description: During shutdown cracks were found in two elbows in the residual heat removal system. These elbows were located between one isolation valve and the reactor vessel. The cracks were probably caused by IGSCC (Intergranular Stress Corrsion Cracking) which has been observed earlier in cold formed bends. The material is austenitic stainless steel SS 2333-25. No heat treatment has followed the manufacturing.
In a diameter 219mm x 16 mm elbow a 13 mm deep crack was found by ultrasonic in-service inspection. After the discovery a decision was made to extend the inspection program. The pipes and elbows have not been inspected before because of the high radiation in the area under the reactor pressure vessel.
In the other elbow, two through wall leaking cracks were found after the inspection. The cracks were obviously missed during the inspection.
The following measures will be taken:
- the inspection program and procedures will be analysed. Further inspection is needed?
- The part of the system, which is one out of two suction lines, will be plugged in the reactor pressure vessel, and taken out of operation.
ERF rating date: 17-03-1993
ERF contact person: MR. F. REISCH
ERF address: Sweden
ERF affiliation: SWEDISH NUCLEAR POWER INSPECTORATE (SKI)

This map shows a selection of reports from nuclear and radiological incidents stored in the IAEA NEWS-database.
Locations are estimates. Contact us if a location is wrong.
The map shows a maximum of 100 incidents. If hundred incidents or more are within the map, the yellow perimeter indicates from where events are excluded. Drag or zoom the map to explore different areas.

Power Reactor Research Reactor Radwaste Facility Enrichment Facility Radiation Source Irradiation/Accelerator Facility Transportation

Fuel Fabrication Fuel Reprocessing Research Facility Mining/Milling Radioisotope Processing/Handling Facility Other