{"query_echo":{"q":"","filters":{"analysis_type":["event log"]},"warnings":[{"code":"facet_value_not_in_vocabulary","message":"Value 'event log' for facet 'analysis_type' is not in the controlled vocabulary."}]},"total":{"value":2,"relation":"eq"},"page":1,"page_size":20,"self":"https://climateinsightsdirectory.org/api/v1/search?analysis_type=event+log","stability":"beta","ai_marking":{"digital_source_type":{"uri":"http://cv.iptc.org/newscodes/digitalsourcetype/trainedAlgorithmicMedia","name":"Created using Generative AI"},"notice":"Summary and key insights are generated using artificial intelligence."},"results":[{"id":"ucs-000732","url":"https://climateinsightsdirectory.org/document/ucs-000732","title":"Groundwater Events Sorted by Date","publisher":{"name":"Union of Concerned Scientists","organization":"union-of-concerned-scientists"},"document_type":"report","language":"en","date_published":"2010-09-27","source_url":"https://www.ucs.org/sites/default/files/2019-10/Groundwater-Events-Sorted-by-Date.pdf","generator":"Climate Insights Directory","generated_fields":["summary","key_insights","climate_tags","geography_discussed","analysis_type"],"summary":{"text":"This report lists specific instances of radioactively contaminated water leaks, spills, and overflows at numerous US nuclear facilities. The events range from small spills of a few gallons to large-scale leaks of hundreds of thousands of gallons, often involving tritium. Common causes include equipment failure, operator error, and pipe degradation, with contamination affecting soil, storm drains, and nearby water bodies such as the Mississippi River, Lake Michigan, and the Connecticut River.","ai_generated":true,"unit":"ucs-000732#summary","date_modified":"2026-10-23"},"key_insights":[{"text":"Numerous events involved the release of radioactively contaminated water into major US water bodies. For example, in 1971, 53,000 gallons spilled into the Mississippi River from Monticello, and in 1976, 83,000 gallons flowed into the Connecticut River from Vermont Yankee.","ai_generated":true,"unit":"ucs-000732#insight-1","date_modified":"2026-10-23"},{"text":"Tritium is a frequently detected contaminant in groundwater and monitoring wells, often exceeding the EPA limit of 20,000 picocuries per liter. At McGuire Unit 2 in 2006, samples measured up to 35,200 picocuries per liter.","ai_generated":true,"unit":"ucs-000732#insight-2","date_modified":"2026-10-23"},{"text":"Operator errors, such as mispositioned valves or failure to close valves, have led to significant spills. At Browns Ferry Unit 1 in 1973, 1,400 gallons of liquid radwaste were discharged to the river due to personnel error.","ai_generated":true,"unit":"ucs-000732#insight-3","date_modified":"2026-10-23"},{"text":"Equipment failure, including ruptured pipes and leaking valves, is a recurring cause of contamination. In 1971 at Dresden Unit 2, a ruptured aluminum test return line caused approximately 15,000 gallons of contaminated water to leak into the ground.","ai_generated":true,"unit":"ucs-000732#insight-4","date_modified":"2026-10-23"},{"text":"Some facilities have experienced systemic issues with condensate storage tanks. At Dresden Units 2 and 3 in 2009, monitoring wells near the condensate storage tank detected tritium concentrations of 3.2 million picocuries per liter.","ai_generated":true,"unit":"ucs-000732#insight-5","date_modified":"2026-10-23"},{"text":"Contamination has occasionally reached public infrastructure. In 1971, approximately 10,000 gallons of contaminated water from Monticello entered the Minneapolis drinking water system.","ai_generated":true,"unit":"ucs-000732#insight-6","date_modified":"2026-10-23"},{"text":"Remediation efforts often involve the excavation of contaminated soil and shipment to licensed waste facilities. At San Onofre Unit 1, 21,900 cubic feet of contaminated sand were excavated and shipped to Richland, WA.","ai_generated":true,"unit":"ucs-000732#insight-7","date_modified":"2026-10-23"},{"text":"The document records instances of uncontrolled releases due to a lack of proper procedures. At Rancho Seco in 1986, the company discharged about 350,000 gallons of contaminated water to the environment using a temporary procedure that was not approved.","ai_generated":true,"unit":"ucs-000732#insight-8","date_modified":"2026-10-23"}],"climate_tags":["nuclear power","environmental remediation","water pollution"],"geography_discussed":["Mississippi River","Connecticut River","Lake Michigan","Barnegat Bay","Long Island Sound","Lake Ontario","Hudson River"],"frame_perspective":[],"analysis_type":["event log","chronological record"]},{"id":"ucs-000733","url":"https://climateinsightsdirectory.org/document/ucs-000733","title":"Groundwater Events Sorted by Location","publisher":{"name":"Union of Concerned Scientists","organization":"union-of-concerned-scientists"},"document_type":"report","language":"en","date_published":"2010-09-27","source_url":"https://www.ucs.org/sites/default/files/2019-10/Groundwater-Events-Sorted-by-Location.pdf","generator":"Climate Insights Directory","generated_fields":["summary","key_insights","climate_tags","analysis_type"],"summary":{"text":"The document catalogs numerous instances of radioactive water leaks and spills at US nuclear power plants, detailing events such as tank overflows, pipe ruptures, and the detection of tritium in groundwater. It lists specific units, dates, and the nature of the contamination, including the volume of water released and the remediation steps taken, such as soil excavation.","ai_generated":true,"unit":"ucs-000733#summary","date_modified":"2026-10-23"},"key_insights":[{"text":"At the Alvin W. Vogtle Unit 1 and Unit 2 plants, radioactively contaminated water leaked from an outdoor temporary storage tank during 1994 and 1995, leading to the removal of contaminated concrete and soil remediation, though radioactivity was still detected in 2006.","ai_generated":true,"unit":"ucs-000733#insight-1","date_modified":"2026-10-23"},{"text":"The Big Rock Point facility experienced multiple contamination events, including a 1984 leak where an estimated 20,000 gallons of radioactively contaminated water from the condensate system leaked into the soil.","ai_generated":true,"unit":"ucs-000733#insight-2","date_modified":"2026-10-23"},{"text":"At Braidwood Unit 1 and Unit 2, an estimated 280 gallons of water with a tritium concentration of 180,000 picocuries per liter leaked from the FRAC tank area on 2006-03-13 due to a failed berm wall.","ai_generated":true,"unit":"ucs-000733#insight-3","date_modified":"2026-10-23"},{"text":"Browns Ferry Unit 1 had an inadvertent discharge of approximately 1,400 gallons of liquid radwaste to the river on 1973-10-19 because a tank was mistakenly placed in discharge mode instead of recirculation mode.","ai_generated":true,"unit":"ucs-000733#insight-4","date_modified":"2026-10-23"},{"text":"Brunswick Unit 2 reported that tritium concentrations in monitoring well ESS-2C increased from 492,600 picocuries per liter in 2004 to 1,833,000 picocuries per liter in 2008.","ai_generated":true,"unit":"ucs-000733#insight-5","date_modified":"2026-10-23"},{"text":"At the Edwin I. Hatch Unit 1 plant, an estimated 8,200 gallons of potentially radioactively contaminated water overflowed an underground collection tank on 2008-05-01 after dirt and gravel buildup disabled the pump.","ai_generated":true,"unit":"ucs-000733#insight-6","date_modified":"2026-10-23"},{"text":"The Haddam Neck facility experienced a significant inadvertent discharge of approximately 223,200 gallons of radioactively contaminated water to the river on 1977-11-04, containing about 266 curies of tritium.","ai_generated":true,"unit":"ucs-000733#insight-7","date_modified":"2026-10-23"},{"text":"At the McGuire Unit 2 plant, multiple groundwater samples from a monitoring station at the northeast corner of the auxiliary building between 2006-02-14 and 2006-07-26 measured tritium levels above the EPA standard of 20,000 picocuries per liter, with one sample reaching 138,000 picocuries per liter.","ai_generated":true,"unit":"ucs-000733#insight-8","date_modified":"2026-10-23"},{"text":"The Oyster Creek plant had an estimated 130,000 gallons of radioactively contaminated water, mostly tritium (estimated 75 curies), leak from the condensate system to the discharge canal and Barnegat Bay in 1996.","ai_generated":true,"unit":"ucs-000733#insight-9","date_modified":"2026-10-23"},{"text":"At the Rancho Seco facility, between January 6, 1986, and March 6, 1986, approximately 350,000 gallons of radioactively contaminated water were discharged to the environment via an uncontrolled process, resulting in a $100,000 civil penalty proposed by the NRC.","ai_generated":true,"unit":"ucs-000733#insight-10","date_modified":"2026-10-23"},{"text":"St. Lucie Unit 1 reported that the refueling water tank leaked approximately 55,141 gallons of radioactively contaminated water into the ground, estimated to contain 6.54 curies, with 6.5 curies being tritium.","ai_generated":true,"unit":"ucs-000733#insight-11","date_modified":"2026-10-23"}],"climate_tags":["nuclear power"],"geography_discussed":[],"frame_perspective":[],"analysis_type":["event log","incident report"]}]}