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What is negative excavation of nuclear island foundation?
Negative excavation of nuclear island foundation is to excavate the underground foundation pit of nuclear island power station.

On September 26, 2007, after the typhoon, the sun was shining in Dongping, Yangjiang, colorful flags were flying, and the nuclear power site was full of joy. At 4: 30 pm, the negative excavation of the nuclear island in the first phase of the project began with a blast in the main plant area of Yangjiang Nuclear Power Station, which marked that Yangjiang Nuclear Power Station entered the preparation stage of the main project after 20 years of preparation and preliminary work. Huang Huahua, Governor of Guangdong Province, attended the groundbreaking ceremony and announced the official commencement of the negative excavation of the nuclear island in the first phase of Yangjiang Nuclear Power Station. He started the commencement button together with Zhong Yangsheng, Executive Vice Governor, Huang Longyun, Yu He, General Manager of the Group Company, Chen Xiaochuan, Secretary of Yangjiang Municipal Committee, and Zhao Jianguo, General Manager of China Southern Power Grid Corporation. At the ceremony, Executive Vice Governor of Zhongyang Province, Mayor Lin and General Manager of Yangjiang City delivered speeches respectively. Li Yinong, general manager of Yangjiang Nuclear Power Company, reported the progress of the project. The ceremony was presided over by Tan Jiansheng, deputy general manager of the group company. Zhong Yangsheng, executive vice governor of Guangdong Province and leader of the provincial nuclear power construction leading group, delivered a speech on behalf of the provincial party committee and government. He pointed out that the start of the negative excavation project of the first phase of Yangjiang Nuclear Power Station marks the comprehensive preparation of the main project of Yangjiang Nuclear Power Station, which is another important achievement of Guangdong Province to actively promote nuclear power construction and a major event to accelerate the development of western Guangdong.