Rajasthan (India)

Map of Rajasthan

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2 * PHWR 200 MW (CANDU) ; constructed by AECL, in operation since 1972 and 1980
2 * PHWR 200 MW under construction by NPCI

Facilities in Rajasthan

plantreactor typconstruction startoperation startshut down
Rajasthan-1CANDU 200 (PHWR)19651972
Rajasthan-2CANDU 200 (PHWR)19681980

Radiation Exposure of workers to tritium

"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.
Event date:
Sat, 2012-06-23
Event sender:

(source: http://climatesceptics.org/event/971)


Rajasthan-1 ready to restart after three-year rehabilitation
Rajasthan-1, shut for repairs since February 1994, was scheduled to restart and generate power by the end of this month.
Workers finished sealing unit 1´s overpressure device leak last month using tools developed by Indian nuclear scientists.
The nuclear scientists have been able to accomplish the difficult job for around 100.000 rupees. Coming in the wake of a similar major success in removing a cooling channel from Rajasthan-2 last year, they have cause to be jubilant.


Replacement of all the 306 coolant tubes. At September 11th, the last of the 306 PT was removed from the core.
Unit-1 &2 were constructed on the basis of a design developed in the mid-60s and with materials susceptible to radiation embrittlement.
The PTshould be buried underground at the site, in holes with a depth of 5 m. Later it was found that the tubes were 5.2 m To solve this problem a cutter was fabricated to divide the tubes.

The new tubes are being manufactured at the Nuclear Fuel Complex, Hyderabad. The job started in May 1996 and is planned to be finished 12 month later.


Shutdown for examination of the fuel carrying pressure tubes. Unit will not operate for at least 3 years for replacement of all fuel channels, recommended by the Reagulatory Board. Inspection found several channels showing signs of radiation induced elongation and hydrogen blistering, similar to the other CANDU-reactors at Pickering & Bruce. (Rajasthan is an earlier design of the CANDU with unit-2 completed by India after Canada cut nuclear cooperation in 1976 following India's nuclear bomb test).
The new channels will be made using an improved version of zircaloy, which should extend the lifetime from 15 to 30 years.


Shutdown after a leak of heavy water. Shutdown was ordered by regulatory body. The leak had been detected 18 months ago, but was not repaired because of lack of remote handling tools !
Restart: 31-3-1995.


Four tons of heavy water spilled due to a rupture of an inlet hose on primary heat transport filter. ECCS was activated.


Working only at one-third of its rated capacity because 15 of its coolant channels have been plugged due to heavy water leaks at the endshields.