Question: when was the first nuclear power plant opened
[{'answer': 'On June 27 , 1954', 'provenance': [{'wikipedia_id': '22153', 'title': 'Nuclear power', 'start_paragraph_id': 37, 'start_character': 0, 'end_paragraph_id': 37, 'end_character': 17, 'bleu_score': 1.0, 'section': 'Section::::History.:Early years.\n'}]}, {'answer': 'the USSR', 'provenance': [{'wikipedia_id': '22153', 'title': 'Nuclear power', 'start_paragraph_id': 32, 'start_character': 32, 'end_paragraph_id': 32, 'end_character': 40, 'bleu_score': 1.0, 'section': 'Section::::History.:First nuclear reactor.\n'}]}, {'answer': 'December 2 , 1942', 'provenance': [{'wikipedia_id': '22153', 'title': 'Nuclear power', 'start_paragraph_id': 28, 'start_character': 259, 'end_paragraph_id': 28, 'end_character': 276, 'bleu_score': 1.0, 'section': 'Section::::History.:First nuclear reactor.\n'}]}, {'answer': 'December 20 , 1951', 'provenance': [{'wikipedia_id': '22153', 'title': 'Nuclear power', 'start_paragraph_id': 33, 'start_character': 69, 'end_paragraph_id': 33, 'end_character': 87, 'bleu_score': 1.0, 'section': 'Section::::History.:First nuclear reactor.\n'}]}, {'answer': 'June 27 , 1954', 'provenance': [{'wikipedia_id': '22153', 'title': 'Nuclear power', 'start_paragraph_id': 37, 'start_character': 3, 'end_paragraph_id': 37, 'end_character': 17, 'bleu_score': 1.0, 'section': 'Section::::History.:Early years.\n'}]}, {'provenance': [{'wikipedia_id': '22153', 'title': 'Nuclear power', 'start_paragraph_id': 37, 'start_character': 0, 'end_paragraph_id': 37, 'end_character': 212, 'bleu_score': 0.633926050304301, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 1058496783573915461}, 'section': 'Section::::History.:Early years.\n'}]}, {'provenance': [{'wikipedia_id': '22153', 'title': 'Nuclear power', 'section': 'Section::::History.:Early years.\n', 'start_paragraph_id': 40, 'end_paragraph_id': 40, 'meta': {'evidence_span': ["though officially code-named PIPPA(Pressurized Pile Producing Power and Plutonium) by the UKAEA to denote the plant's dual commercial and military role. The U.S. Army, nuclear power program, formally commenced in 1954. Under its management, the 2 megawatt SM-1, at Fort Belvoir, Virginia, was the first in the United States to supply electricity in an industrial capacity to the commercial grid (VEPCO), in April 1957. The first commercial nuclear station to become operational in the United States was the 60 MW Shippingport Reactor (Pennsylvania\rhighlight sentence(s) containing evidence, not only the answer", "though officially code-named PIPPA(Pressurized Pile Producing Power and Plutonium) by the UKAEA to denote the plant's dual commercial and military role. The U.S. Army, nuclear power program, formally commenced in 1954. Under its management, the 2 megawatt SM-1, at Fort Belvoir, Virginia, was the first in the United States to supply electricity in an industrial capacity to the commercial grid (VEPCO), in April 1957. The first commercial nuclear station to become operational in the United States was the 60 MW Shippingport Reactor (Pennsylvania"]}}]}, {'provenance': [{'wikipedia_id': '4131402', 'title': 'Nuclear power in the United States', 'section': 'Section::::History.:Opposition to nuclear power.\n', 'start_paragraph_id': 17, 'end_paragraph_id': 17, 'meta': {'evidence_span': ['Nuclear Regulatory Commission (USNRC or simply NRC). There has been considerable opposition to the use of nuclear power in the United States. The first U.S. reactor to face public opposition was Enrico Fermi Nuclear Generating Station in 1957. It was built approximately 30 miles from Detroit and there was opposition from the United Auto Workers Union. Pacific Gas & Electric planned to build the first commercially viable nuclear power plant in the US at Bodega Bay, north of San Francisco. The proposal was controversial and conflict with local citizens began in 1958. The conflict ended in 1964, with the forced abandonment of plans for the power plant. Historian Thomas Wellock traces the birth of the anti-nuclear movement to the controversy over Bodega Bay. Attempts to build a nuclear power plant in Malibu were similar to those at Bodega Bay and were also abandoned.', 'Nuclear Regulatory Commission (USNRC or simply NRC). There has been considerable opposition to the use of nuclear power in the United States. The first U.S. reactor to face public opposition was Enrico Fermi Nuclear Generating Station in 1957. It was built approximately 30 miles from Detroit and there was opposition from the United Auto Workers Union. Pacific Gas & Electric planned to build the first commercially viable nuclear power plant in the US at Bodega Bay, north of San Francisco. The proposal was controversial and conflict with local citizens began in 1958. The conflict ended in 1964, with the forced abandonment of plans for the power plant. Historian Thomas Wellock traces the birth of the anti-nuclear movement to the controversy over Bodega Bay. Attempts to build a nuclear power plant in Malibu were similar to those at Bodega Bay and were also abandoned.']}}]}, {'provenance': [{'wikipedia_id': '22153', 'title': 'Nuclear power', 'section': 'Section::::History.:Early years.\n', 'start_paragraph_id': 37, 'end_paragraph_id': 37, 'meta': {'evidence_span': ["On June 27, 1954, the USSR's Obninsk Nuclear Power Plant, based on what would become the prototype of the RBMK reactor design,", "On June 27, 1954, the USSR's Obninsk Nuclear Power Plant, based on what would become the prototype of the RBMK reactor design, became the world's first nuclear power plant to generate electricity for a power grid, producing around 5 megawatts of electric power.", "On June 27, 1954, the USSR's Obninsk Nuclear Power Plant, based on what would become the prototype of the RBMK reactor design, became the world's first nuclear power plant to generate electricity for a power grid, producing around 5 megawatts of electric power."]}}]}]