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During 2016, Unit 1 of EPR Taishan NPP was submitted to an initial Containment Tightness Test intending to demonstrate its capacity to meet the design criteria in terms of resistance and leak tightness under a pressure equal to 6 bars absolute. TRACTEBEL FRANCE along with CEMENTYS company provided support to CNPEC (China Nuclear Power Engineering Company) by assessing the structural behaviour of containment during the test.

The containment instrumentation system is mainly composed by several measurement and data collection devices embedded in the pre-stressed concrete containment and devices located in the annulus at the external surface of the containment.

Deformation on inner containment wall during construction and subsequently will allow evaluating structural behaviour of the containment.

Auftraggeber	CNPEC (CGN group)
Standort	Taishan, Jiangmen, Guangdong, China
Laufzeit	2016

Services Provided

Assessment of monitoring systems by comparison of collected measures during construction and prestressing phases to calculated strains and displacements.
Prediction of measurements during CTT
Presence on site during the test in order to follow the inner containment deformation and detect potential abnormal behaviour.
Analysis of the containment mechanical behaviour based
- i) on results of externals visual inspections and
- ii) comparison between measurements gathered during CTT and pre-calculated values.
Analysis of measured valued of strains appearing in inner containment wall during prestressing phases.
Assessment of mechanical characteristics of inner containment wall i.e. Young modulus Ec and Poisson coefficient .c, from actual strains measured in typical part of the structure during prestressing phases.
Calculation of expected strains during Containment Tightness Test at the maximum pressure level of CTT scenario.
Assessment of availability of EAU data system (detection of wrong direction of implementation, inversion of connection, abnormal data).

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EPR Taishan – Inner Containment Tightness Test

Services Provided