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Japan's crippled Fukushima nuclear power plant is leaking water from the center of the reactor seen as the closest to stabilizing, its operator said on Thursday, risking a delay in its plan to resolve the worst nuclear disaster since Chernobyl.

The discovery of the leak, through a hole in the container that houses the reactor core, provides new insight into the sequence of events that triggered a partial meltdown of the uranium fuel in the No. 1 reactor at Fukushima after the plant was struck by a massive earthquake and tsunami on March 11, officials said.

The battle to bring Fukushima under control has been complicated by repeated leaks of radioactive water, threatening both the nearby Pacific Ocean and nearby groundwater.

Workers at the Fukushima Daiichi nuclear plant have been pumping water into four of the six reactors on the site to bring their nuclear fuel rods to a "cold shutdown" state by January.

But after repairing a gauge in the No. 1 reactor earlier this week, Tokyo Electric Power Co discove,77991,63160,58111,40864,36804,41018,94928,48965,67288,24354,85397,96656,53530,40788,58550,13924,55501,55744,83672,81190,51742,69506,70191,72544,20675,43369,61787,28781,71550,28366,27796,42495,37401,39153,60878,66504,82003,28845,74346,76141,92961,39139,24988,98966,52827,63471,76273,15966,97862,24675,14885,51913,15199,83092,46996,64120,18363,19078,22676,48507,83821,51257,47444,27247,92752,53983,91892,23470,26241,33447,97523,90368,28581,63040,46046,28632,76517,84606,52933,14838,21575,77320,17774,72056,30949,38473,33190,98000,91052,27920,55913,84278,23076,70395,69952,79570,43428,94524,37976,11800,17560,22243,44805,16722,71067,23522,18238,78128,93852,45202,86520,57530,13987,38156,50456,17003,73719,14617,61745,12933,24872,66874,22029,83243,88118,46445,88528,88245,71216,79894,24160,33622,63851,84044,81380,66744,94220,59904,54511,79438,47614,92292,12512,11844,70529,15716,54267,45153,87265,87025,68688,91321,67453,65655,41221,26370,28398,31071,72087,28763,89833,91589,49468,83799,12076,46059,31503,70007,37131,67291,80924,24986,24792,78805,71860,18453,39442,70116,11100,62544,32570,67602,21888,67607,14031,63378,86805,32305,28186,64588,37447,75835,47876,55882,12352,64937,25159,58599,82505,72938,46956,46267,77299,84788,86481,34172,87080,19251,76499,30746,29286,79369,32033,67493,66086,68636,30397,28571,66416,95260,28541,63158,34291,34603,56644,42480,88408,10194,43306,74666,34434,86680,26330,32676,45938,37979,85253,80321,81361,13712,46936,57537,83514,15665,59098,43671,45201,42054,21518,73863,61610,40433,51685,48125,75706,99515,64232,41553,41172,91801,58779,14885,73188,33329,79662,95777,13885,92912,91348,62270,20087,10281,37634,27411,12793,37713,69615,72138,12319,99982,51510,94047,41775,63310,67133,45219,72085,85336,22168,79037,85806,51033,51302,39090,90330,96652,89598,92816,56787,58122,28772,87864,50454,48366,33368,30546,22455,20449,45074,52030,22021,90984,13513,38578,28423,71864,25645,24312,26916,77648,17258,88426,41509,84926,80208,49874,13025,81847,71965,29277,63005,45945,25478,50166,14406,35686,81861,70209,81837,56877,76509,86650,94876,58169,82975,85093,84173,64385,32573,58763,59331,57635,42898,13107,63337,53273,89998,97373,19114,72156,49273,73396,25501,55407,65874,77663,61306,32269,27888,38309,54235,28579,38699,57977,84925,99299,57278,10624,76975,49914,21949,66265,59686,17158,53015,41841,22344,57800,59183,53894,44741,27642,73539,72563,78065,29887,24989,70304,10525,11055,91617,81821,33350,53079,52551,64825,67896,55709,51137,37861,73124,99837,82740,51754,29140,35574,23004,88514,11818,52842,60271,24711,44712,59976,79619,54960,51320,62873,45132,92464,51569,71101,76437,11858,25986,55002,33090,72544,56260,83275,88949,27011,75112,85899,74854,82919,65561,20127,47379,29146,91682,36575,39763,67129,51134,19411,81624,78286,52296,60951,98840,40309,87963,51570,61413,82884,61473,53576,72752,93147,49211,85227,34581,24330,76374,80829,39180,69945,74060,46058,26070,65602,87413,46558,90955,47312,90168,88205,55711,12202,19025,72117,38719,75123,67357,46107,73424,93655,20643,72147