Control of Concrete Structure of Drums Turbines of Inga II Hydroelectric Power Station by the Ultrasound Non-Destructive Testing Method
R Nkulu Kashale1, LP Kaja Mukinay2, PA Matamba Kaleji2+, C Kabwika
Kitumbi2, P Mabiala Mulomba2, B Mandungu Kiese2 and O Kawende Kalonda1 and D Kabeya Ngalamulume2*
1Société Nationale d’Electricité (SNEL), B.P.500 Kinshasa/Gombe, République Démocratique du Congo
2Commissariat Général à l’Energie Atomique/Centre d’Etudes Nucléaires de Kinshasa
(CGEA/CREN-K), B.P. 868 Kinshasa XI, République Démocratique du Congo
2+Dr MATAMBA Kaleji passed away in 2022
*Corresponding Author: D Kabeya Ngalamulume, Commissariat Général à l’Energie Atomique/Centre d’Etudes Nucléaires de Kinshasa (CGEA/CREN-K), B.P. 868 Kinshasa XI, République Démocratique du Congo.
May 31, 2023; Published: June 28, 2023
The Hydroelectric power station of Inga II is constituted by 8 groups of drums turbines to produce electricity of 1420 MW. These drums turbines are sustained by reinforced concrete constructions that, with time of service, present surface and internal cracks. The origin of those cracks at the same height for each group seems to be the distribution of internal vibrations in the concrete due to turbines rotation motion. The reinforced concrete constructions width is 4 m.
For the hydroelectric power station maintenance, in April 2019, a control by ultrasounds was conducted for assessing the depth of visible surface cracks on the reinforced concrete construction. The control consisted in the determination of the uniformity of the concrete by B SCAN. The elasticity modulus and the Poisson's ratio of the concrete are determined by calculation using longitudinal and transverse velocities obtained by concrete A SCAN. All of 8 controlled drums turbines show cracks depth between 15 and 50 cm and measured ultrasounds longitudinal velocities are in the interval [9398 m/s - 9401 m/s], those values are acceptable for the reinforced concrete construction depth of 4 m.
Keywords: Hydroelectric Power Station; Drums Turbines; Reinforced Concrete; Non-Destructive Testing; Ultrasound
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