Validation of the integrity of a HEPA filter system.
The objective of this study was to establish a delayed air sampling method to verify the integrity of an existing HEPA filter system in a ventilated fume hood. (238U,232Th)O2 microspheres were generated to fabricate cement nuclear fuel pellets in a HEPA-filtered hood. To comply with the air effluent concentration limits by NRC, the capture efficiency of the HEPA filter was examined. An in-line isokinetic air sampling system was installed downstream of the HEPA filter. Utilizing a gas flow proportional counter, 212Pb was used as a surrogate to indicate any possible penetration of the (238U,232Th)O2 particles through the HEPA filter. Based on the experimental results, this delayed sampling method proved to be an easy and effective way to validate the integrity of the HEPA filter.
Wang
Wei-Hsung
WH
Department of Radiological and Environmental Management, School of Health Sciences, Purdue University, 550 Stadium Mall Drive, West Lafayette, IN 47907-2051, USA. weihsung@lsu.edu
D000396:Air Pollutants, Radioactive / Q000032:analysis; D000398:Air Pollution, Radioactive / Q000517:prevention & control*; D019544:Equipment Failure Analysis / Q000295:instrumentation / Q000379:methods* / Q000592:standards; D007856:Lead Radioisotopes / Q000302:isolation & purification; D008863:Microspheres; D016273:Occupational Exposure / Q000517:prevention & control; D016272:Occupational Health; D010316:Particle Size; D011835:Radiation Protection / Q000295:instrumentation* / Q000379:methods / Q000592:standards; D011850:Radioactive Waste / Q000032:analysis*; D015203:Reproducibility of Results; D012680:Sensitivity and Specificity; D013911:Thorium Dioxide / Q000302:isolation & purification*; D014462:Ultrafiltration / Q000295:instrumentation* / Q000379:methods / Q000592:standards; D017974:Uranium Compounds / Q000302:isolation & purification*
D000396:Air Pollutants, Radioactive; D007856:Lead Radioisotopes; D011850:Radioactive Waste; D017974:Uranium Compounds; D013911:Thorium Dioxide; C012597:uranium dioxide