TOKYO (QHA) - Increased levels of the radioactive element tritium have been found in groundwater at the wrecked Fukushima nuclear plant in Japan, reports Euronews. Readings, taken from samples drawn from a well close to storage tanks holding contaminated water, were more than 50 percent higher on Wednesday than a day earlier. Operator Tepco revealed the findings as Prime Minister Shinzo Abe and his government tried to reassure the international community that the situation at Fukushima is “under control.” Two-and-a-half years after a massive earthquake and tsunami crippled the plant, Tepco is still struggling to pump out and treat massive amounts of contaminated water, which is rising at a rate of 400 tonnes a day. Nuclear plants in Japan are allowed to release water with up to 60,000 becquerels of tritium per litre. A becquerel is a measure of the release of radioactive energy. As reported, the groundwater measurements rose to 97,000 becquerels per litre on Wednesday from 64,000 on Tuesday.