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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, 02-07-2012
ERF description: On June 23, 2012, Rajasthan-5 was under planned biennial shutdown. Work was in progress to weld a piping connection for making alternate provision for water addition to the moderator system. During the work, tritium concentration in the work area increased when an opening was made in the moderator cover gas line. Two of the contract workers involved in the job got internal exposure of tritium equivalent to radiation dose of 24.32 mSv and 16.54 mSv. The radiation dose to the workers though less than the statutory annual dose limit of 30 mSv for workers, exceeded the dose constraints.

Rajasthan-5 is Pressurized Heavy Water Reactor (PHWR) based nuclear power plant. PHWRs use Heavy Water as coolant and moderator. Tritium activity in Heavy Water systems increases over a period of time. Tritium is a soft beta emitter and can cause internal exposure once it enters the body. Tritium gets removed from the body through natural processes.
ERF rating date: 29-06-2012
ERF contact person: Deepak Ojha
ERF address: Reported by Atomic Energy Regulatory Board of India on 02 Jul 2012. Last update on 02 Jul 2012
ERF affiliation: Atomic Energy Regulatory Board

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