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發表人 nicenter 於 2019/2/18 10:18:09 (7 人讀取)

NRC seeks input on legacy uranium cleanup


The US Nuclear Regulatory Commission (NRC) is seeking public comment on its environmental review of proposed cleanup work at the former Northeast Church Rock uranium mine in New Mexico. The proposal would allow mine owner United Nuclear Corporation (UNC) to transfer contaminated soil from the mine for disposal at the former Church Rock uranium mill.




Remediation work at the Northeast Church Rock mine site, pictured in 2009 (Image: EPA)

The Northeast Church Rock mine is about 17 miles (27 kilometres) northeast of Gallup, New Mexico in the Pinedale Chapter of the Navajo Nation, and operated from 1967 to 1982 during which about 3.5 million tons of ore were extracted. Ore from Northeast Church Rock was processed at the Church Rock mill, under a licence from the State of New Mexico.


The mill has since 1988 been under the dual regulatory oversight of the NRC and the Environmental Protection Agency (EPA), under a memorandum of understanding between the two agencies. The NRC is the lead agency regulating surface reclamation and closure activities at the mill site, while the EPA is the lead agency regulating cleanup of the mine. In September 2018 UNC - a subsidiary of General Electric - submitted its request for a licence amendment to the NRC.


Over 200,000 tons of contaminated soil has already been removed from the residential area around the mine and brought back to the mine waste pile, which has been temporarily covered and stabilised until it can be removed. UNC now wants to excavate about 1 million cubic yards (765,000 cubic metres) of mine spoils and transfer them to the adjacent mill site, which has an existing tailings impoundment facility.


Waste that meets EPA action levels for cleanup - that is, 2.24 picocuries per gram (pCi/g) of radium-226 and 230 mg/kg natural uranium or less - would be moved from the mine site and placed within the footprint of the existing tailings impoundment on the mill site. Any waste containing 200 pCi/g or more of radium-226 or 500 mg/kg of total uranium would be segregated and transported to an offsite licensed facility for disposal and therefore would not be placed at the mill site. Construction of a cover between the underlying tailings and the mine spoils is proposed, as well as a cover over the final mine waste surface. The proposal is part of a broader cleanup action which has been approved by the EPA.


The Navajo Nation covers over 27,000 square miles of the states of Arizona, New Mexico and Utah, and has a population of over 250,000. From 1944 to 1986, nearly 30 million tons of uranium ore were extracted from Navajo lands under leases with Nation. However, a legacy of uranium contamination remains, including over 500 abandoned uranium mines. Federal agencies are working together to reduce the highest risks to Navajo people from uranium contamination resulting from the abandoned mines, and since 1994 the Superfund Programme has provided technical assistance and funding to assess potentially contaminated sites and develop a response.


The EPA and the Navajo Nation EPA have identified 46 of the 500 abandoned mines as priorities for cleanup, based on gamma radiation levels, proximity to homes and potential for water contamination. Northeast Church Rock has been identified as the highest priority mine because of the proximity of residents to the mine site.


The EPA has overall responsibility for establishing environmental standards for decommissioning of uranium production facilities under the Uranium Mill Tailings and Radiation Control Act of 1978, with the NRC responsible for licensing and regulating uranium production and related activities, including decommissioning.


Members of the public have until 19 April to comment on the scope of NRC's environmental review. The commission will then prepare an environmental impact statement to examine the potential environmental impacts of the proposed action. The draft EIS will be made available for public comment.


Researched and written by World Nuclear News



source: http://www.world-nuclear-news.org/Articles/NRC-seeks-input-on-legacy-uranium-cleanup


更多內容 國際核能現況

發表人 nicenter 於 2019/2/15 13:21:15 (16 人讀取)

低放(蘭嶼)貯存場今日(108年2月14日)因突發電力線路問題造成停電,預計今日維修完畢,原能會持續監控貯存場輻射安全。


低放(蘭嶼)貯存場今日(108年2月14日)因突發電力線路問題造成停電,預計今日維修完畢,原能會持續監控貯存場輻射安全,受影響區域如下:


•日期時間:108年2月14日

•影響區域:

環境輻射監測站編號501、502、503之監測數據仍持續記錄,惟數據即時傳送網路功能受影響。


台電公司應本會要求,其所屬核設施之即時輻射監測站已有不斷電系統,以確保監測數據紀錄不中斷。在此期間,本會於貯存場周圍的環境輻射即時監測站仍持續嚴密監控貯存場輻射安全。



source: https://www.aec.gov.tw/newsdetail/headline/4766.html


更多內容 核能新聞

發表人 nicenter 於 2017/6/14 9:29:38 (246 人讀取)

原能會收到台電公司依「核子反應器設施停止運轉後再起動管制辦法」所提出之核二廠1號機起動後併聯申請,經審查相關申請文件,並整合起動過程間各項現場視察結果,確認機組運作狀態符合併聯要求,於今日19時25分同意核二廠1號機可併聯發電。

閱讀全文... | 786字符 (含本文)

更多內容 核能簡訊

發表人 nicenter 於 2016/12/12 16:01:22 (988 人讀取)

PDF檔內共有6篇有關核四的文章,是由多位旅美的核能專家共同撰寫,希望提供國內民眾更多客觀、中立的核能專業資訊。


更多內容 核四公投

發表人 nicenter 於 2007/3/23 9:54:35 (2512 人讀取)

『輻射意外緊急醫療處理國際研討會』

主辦單位:三軍總醫院

日期:2007年5月25-26日

聯絡人:
三軍總醫院 核子醫學部
林立凡、徐詩婕
電話:02-87923311-16704、16712


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