Kinh Doanh | school of medicine |
The ministries of industry-trade and construction said the "hydropower plant is generally safe", although admitting that the concrete quality of the construction is problematic, according to a recent press meeting.
The ministries of industry-trade and construction said the " hydropower plant is generally safe", although admitting that the concrete quality of the construction is problematic, according to a recent press meeting.
However, many state officials said the seepage of too much water through the cracks and expansion joints in the dam body to the downstream is not allowed, said a meeting on Wednesday afternoon.
Safe and sound
According to preliminary field surveys , the leakages are found at some waterproofing structures in the expansion joints and some other locations, said the meeting joined by the ministries of industry-trade, construction and the Electricity of Vietnam group (EVN), the investor and operator of the plant.
Recent waterproofing measures, including the drilling to pump enhancing substances to the waterproofing structures, have blocked the water flow to the drainage systems, thus making more water seepages via the cracks, said the ministry.
Le Quang Hung, director of the State Inspection Department for Construction Work under the Ministry of Construction said "of course, there must be defects in the concrete structure leading to the water leakages."
However, Hung said that there were many types of defects with various impacts on a construction work, adding that if the water mainly leaks via the joints, there will be no need to drill the concrete structure to take samples for more in-depth testing.
Regarding the question if local residents should be relocated for their own safety , Hung said there is no need for that.
Hoang Quoc Vuong, Deputy Minister of Industry and Trade, said the volume of water flowing downstream only at around 7-8 liters per second, a significant reduction compared to what the people watched on the television a few days ago.
He reaffirmed that the inspection team had yet discovered any serious cracks in the dam body.
"With the current water flow and field observation, we confirm that the construction is sound and safe."
"There will definitely be no accidents which could endanger the lives and property of the people living in the downstream," Vuong said.
The waterproofing measures for the joints, which should be taken systematically with great care, must be done as fast as possible before the coming rainy season.
Regarding the responsibility for the incident, the ministry said EVN should be the one to bear it, adding that the responsibilities of the individuals involved would also be figured out depending on the how the incident develops.
Hoang Quoc Vuong also added that the same thing had happened to PleiKrong Hydropower Plant in the Central Highlands Kon Tum Province, and the problem had finally been sorted out.
Explanations in document, please
The local people and the municipal government are still very anxious, said Dinh Van Thu, deputy chairman of Quang Nam Province, adding that the joint state agencies should issue a written explanations to the people.
But Vuong said there are enough documents so that the local government can explain the situation to the people themselves.
Regarding the effects of mini earthquake in the reservoir to the whole project, the Ministry of Trade and Industry confirmed that the phenomenon is normal during the time water filling up the reservoir, and it would subside within 5 years later.
On the other hand, the project was designed to withstand earthquake at level VII (MSK-64) which is equivalent to 5.5 magnitudes on the Richter scale, so internal earthquake at the end of 2011 does not affect the safety of the dam.
However, the Ministry of Industry and Trade has asked EVN to closely collaborate with the Institute of Geophysics and other relevant authorities to monitor, track the evolution of regional seismic stimulation in the reservoir to get updated data for the assessment of the dam stability.
Under the direction of the Prime Minister, in the coming time, the Ministry of Trade and Industry and State Inspection Department for Construction Work will supervise the waterproofing work of EVN at the project.