Hatch 1 nuclear reactor down to 40% power Sunday: why?

Why is Plant Hatch Unit 1 running at well below capacity? Saturday 19 Jan 2013 that nuclear plant was at 100%, according to the NRC, yet Sunday it was down to 45%, then 40% Monday and 64% today. What's going on at Hatch 1? And what happened to nuclear supposedly being 24/7?

There's no event report about this from the NRC; the last item the NRC has on Hatch 1 seems to be from 2003. Southern Company provides no information on this event. Another source (Platts, 4 January 2013) says Hatch 2 (and Vogtle 2) are to refuel in the first half of this year, among Fifty-six US nuclear units to shut for refueling in 2013. But Hatch 1 is not on that list, and a similar Hatch 1 brownout happened 5 and 6 January:

Saturday2013-01-0587%
Sunday2013-01-06100%
Monday2013-01-0799%
Tuesday2013-01-08100%
Saturday2013-01-19100%
Sunday2013-01-2045%
Monday2013-01-2140%
Tuesday2013-01-2264%

Until a month ago, NRC's reactor status summaries used to include a "Reason or Comment" about reactors with less than 100% power, like this:

Crystal River 3 0 09/25/2009 DEFUELED – CONT. TENSIONING ON HOLD

Do people no longer need to know about those things? Or does it take NRC a month to get around to adding those notes?

Only 125 miles from here, why was Farley 1 at 93% on 19 January 2013? Meanwhile, 160 miles from here, Crystal River 3 (the only nuclear reactor at Crystal River, FL) remains at 0%, as it has since 2009. 200 miles from here, Vogtle 1 and 2 have remained at 100% for the past 30 days: congratulations! However, Vogtle Units 3 and 4 remain at 0% as construction delays stretch out and costs go up.

Somebody explain to me again how big centralized baseload power plants, especially nuclear, are supposed to be good because they're up 24/7?

-jsq