Russia's last plutonium production reactor, ADE-2 at Zheleznogorsk, was shut down at midnight on May 31, 2009 (at 24:00 MSK according to one report, which was 04:00, June 1st in Zheleznogorsk). The shutdown is not permanent yet - officially, the reactor has been stopped for maintenance and could be restarted in September if the replacement power station is not ready by that time. According to the U.S.-Russian agreement, the reactor should be shut down completely no later than 2010.
Since 1994, the ADE-2 reactor and its two counterparts in Seversk, ADE-4 and ADE-5, which were shut down in April 2008 and June 2008 respectively, have been producing weapon-grade plutonium that was placed in storage as plutonium oxide - about 8 tonnes in Zheleznogorsk and 10 tonnes at Seversk. All this material will be consolidated at Zheleznogorsk.
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Comments
Does Russia keep facilities to produce replacement tritium? What are the locations?
Yes, there are two tritium-production reactors that are still operational at Mayak - Ruslan and LF-2/Lyudmila. They seem to be producing isotopes these days, but could get back to tritium production if necessary.
If the shut down becomes permanent, what effect will this have on our ability to produce weapons-grade fissile material?