1. Reactor Safety Division, Bhabha Atomic Research Centre, Trombay, Mumbai-400085, IN (Corresponding author), e-mail: mksamal@barc.gov.in
2. Post Irradiation Examination Division, Bhabha Atomic Research Centre, Mumbai 400085, IN.
3. Department of Production Engineering, F.C.R. College of Engineering, Mumbai 400050, IN.