BARC Containment (BARCOM) test model located within the experimental facility at Tarapur, India built for the ultimate load capacity evaluation and leakage assessment of nuclear containment, was subjected to pressurization experiments with air. Pneumatic experiments up to over-pressurization level of 1.77 times the design pressure (Pd) were carried out. With the limited air compressor capacity, further diminished by significant leakage due to the development of through thickness cracks localized around the discontinuity locations and parallel vertical cracks throughout the full circumference in the free field at certain elevations of BARCOM, it could not be pressurized beyond 1.77 Pd. For further pneumatic testing, requisite leak tightness needs to be ensured. Therefore, it was recommended to apply a polymer liner inside the surface of the nuclear containment test model, which are commonly deployed in various containment structures for improved leak-tightness characteristics.In addition to the qualification of synthetic liner coating material for the intended repair application, the fracture characterization studies conducted through Digital Image Correlation (DIC) and a novel Optical Crack Profiling (OCP) scheme developed by the present authors on cylindrical specimens enabled verification of various fracture parameters as observed during the standard material characterization studies. The size of the fracture process zone of concrete is evaluated and a correlation is evolved to estimate concrete fracture energy which is applicable for safety evaluation of important structures.