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: Mon, 17-07-1995
ERF description: Robinson Unit 2 was operating at 2 percent reactor power with preparations underway to place the turbine/generator on line. An auxiliary operator notified the control room that the "A" charging pump relief valve was lifting. Control room operators started the "B" charging pump and isolated the "A" charging pump. Operators completed isolating the lifting relief valve within approximately 15 minutes, after which time the volume control tank level and pressurizer level stabilized. The leak rate was calculated to be approximately 284 liters/minute (75 gallons/minute). The diversion of charging flow through the failed relief valve was directed to and contained in a liquid radioactivce waste hold up tank. There was no radiological release and no personnel exposures. The operators continued with an orderly plant startup. An investigation into the failure mechanism of the relief valve is underway.
Justification for rating:
The event is rated level 0, below scale in accordance with Paragraph III-2.5.2 of the INES user's manual. The leakage from the lifting charging pump relief valve was "identified leakage", was not pressure boundary leakage and charging pump relief valve is considered to be an "expected" initiator, and is not considered to be a small loss of coolant accident. The safety function availability at the time of the event was fully operable. Therefore, the event is rated "level 0, below scale", in accordance with Table II of the INES user's manual.
ERF rating date: 28-06-1995
ERF contact person: R.J. BARRETT
ERF address: United States
ERF affiliation: USNRC, EMERGENCY RESPONSE BRANCH, OFFICE FOR ANALYSIS AND EVALU

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