ISFSI Environmental Monitoring at SONGS San Onofre Nuclear Generating Station Overview of SONGS ISFSI ISFSI CAB SONGS 1 mile radius Annual Duplicate TLD Year TLD 67TLD 201 mR/std qtr Quarterly Duplicate Comparison of TLD data to PIC data PICTLD TLD data vs known radiological conditions Data from Unit 1 reactor vessel removal East side of ISFSI vs West side Data from known radiological events Transit Dose Need to correct for transit dose if shipping TLDs offsite Need to carefully select shipping vendor Packing Geometry may become most significant factor in the TLD data Lessons Learned Its never too early to start preoperational data acquisition Pre-operational data may be more relevant than control data when estimating dose attributable to operation Carefully monitor transit dose if shipping TLDs offsite Use PICs and duplicates for QA