Development of neutron radiography techniques for nuclear component testing

For the non-destructive inspection of post-irradiated nuclear fuel pins and radioactive reactor components, neutron radiography (NR) project has been undertaken and this annual report describes work progress of NR facility construction. On plan of the first-year work, design and fabrication of inpile neutron collimators and beam shutter are completed and currently installation work is under way at tangential beamport (T-2) of TRIGA-III reactor. As some typical design parameters, collimation ratio and max, beam aperture are 110-150 and 30cm in dia respectively, and thermal neutron flux of 1.5*106 n/cm2 sec is expected at NR object. In parallel to the above, various experimental provisions to test beam purity and uniformity of spacial distribution etc. are also completed. And, basic studies for exposure characteristics and quantitative assessment of image quality using calibrated fuel pin are in progress. (Author)