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            About the site TEXT SIZE: A A A

Location of Daya Bay

The proposed experimental site is located at the east side of the Dapeng peninsula, on the west coast of Daya Bay, where the coastline goes from southwest to northeast. It is in the Dapeng township of the Longgang Administrative District, Shenzhen Municipality, Guangdong Province. There are hills and mountain ranges on the north. The geographic location is east longitudinal 114o33'00" and north latitude 22o36'00".

The experimental site is close to two mega cities, Hong Kong and Shenzhen and one medium city, Huizhou. The Shenzhen City is 45 km to the west, Hong Kong 55 km to the southwest, and the border of the Huizhou - Daya Bay Economic Development Zone 10 km to the north, all measured in direct distances. Shenzhen, once a small border town before 1979, is the first Special Economic Zone in China. With a total population of about 7 million, many international corporations have their Asian headquarters there. It is both a key commercial and tourist hot spot in South China. The city is ranked fourth in GDP, third in revenue among China's cities, second in container handling capacity, and first for seven consecutive years in import and export volumes which account for one-seventh of the whole of china. Shenzhen Bao'an international Airport is one of the four largest airports in china and an air cargo hub for the South China region.

There is no railway within a radius of 15 km of the site. The highway from Daya Bay NPP to Dapeng Township (Wang Mu) is of the second-class grade and 12 m wide. The Dapeng Township is connected to Shenzhen, Hong Kong, and Guangzhou by highways which are either of the first-class grade or expressways.

There are two maritime shipping lines near the site in Daya Bay, one on the east side and the other on the west side of the Central Archipelago. Oil tankers to and from Nanhai Petrochemical, a $4.3 billion joint venture of Shell and China National Offshore Oil Corporation, use the east line. The Huizhou Harbor, which is located on the Quandao peninsula, is 13 km north of the site. Two general-purpose 10,000-ton docks were constructed in 1989. Their functions include transporting passengers, sundry goods, construction materials, and petroleum products. These transportation ships use the west line. The minimum distance from the west line to the site is about 6 km. Two restricted docks of 3000-ton and 5000-ton capacity, respectively, have been constructed during the construction of the Daya Bay NPP.

Daya Bay and Ling Ao Power Plants

The Daya Bay Nuclear Power Plant (NPP) is situated on the southwest and the LingAo NPP to the northeast near the coastline. Both Daya Bay and LingAo NPPs each have two reactor cores which are separated by 88 m from each other. The separation of the centers of the two NPPs is about 1100 m. The thermal power of each core is 2.9 GW. Hence the existing total available thermal power for the experiment is 11.6 GW. A third NPP, called LingAo-II NPP, will be built roughly along the line extended from Daya Bay to LingAo, about 400 m northeast of LingAo. There will be two cores with thermal power 2.9 GW each. Ling Ao II is sheduled to generate power in 2010. So when in full operation, the Daya Bay - LingAo - LingAo-II NPP complex can provide a total thermal power of 17.4 GW.

 

 

 

 

Site Survey

The site is surrounded in the north by a group of hills which slope upward from southwest to northeast. The slopes of the hills vary from 10o to 45o. The ridges vary up and down with smooth round hill tops. Within 2 km of the site the elevation is generally 185 to 400 m. The summit, called Pai Ya Shan, is 707 m PRD. Due to the construction of the Daya Bay and LingAo NPPs, the southwest to southeast coast regions, where the access to the experimental sites will be located, are levelled, with height in the range 6.6-20 m PRD.

According to the available geological structure maps, the near-detector site lies in the southwest portion of the Lianhua Mountain fault, in the south side of the Pai Ya Shan. It is on the massif between the Wuhua - Shenzhen and Da Pu - Haifeng sub-faults. Close to the site there are very few faults and they are not directly related to the above mentioned faults. Hence the geological structure of the near site is rather simple. The earth surface exploration and trenching exposure show that the landforms and terrains are in good condition. The site geology structure is simple. There are no karsts, landslides, collapsing, mud slides, empty pockets, ground sinking asymmetry, hot springs, etc., that would affect negatively the stability of the site region. There are only individual loose granites which are separately distributed due to globular weathering.

  • D2ga: Lower Guitou formation: grey psephite, mixed siliceous, gritstone with gravel

  • g25(3): biotite granite-porphyry, porphyroid biotite granite

  • Qmd: deposits of marine terrace 1: grey-white, white medium sand

  • D2gd: is not listed in the legend but presumably very similar to D2ga.

All the geological data of Daya Bay are taken from "Atlas of Natural Resources and Economic Development of Shenzhen", Science Press, Beijing, China, 1985 (#5434-91).

Rock indices (granite, sample from Daya Bay and Ling Ao quarry):

  • Density: 26.3 kN/m3

  • Pressure resistance strength of a saturated single stalk: 208.4 MPa

  • Pressure resistance strength of a dry single stalk: 212.1 MPa

  • Softening coefficient: 0.98

  • Elastic modulus: 61500 MPa

  • Poisson ratio: 0.28

 
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