1. ISFSI Environmental Monitoring at SONGS

2. San Onofre Nuclear Generating Station

3. Overview of SONGS ISFSI

4. ISFSI CAB

5. SONGS 1 mile radius

6. Annual Duplicate TLD Year TLD 67TLD 201 mR/std qtr 200116.4016.42 200217.7217.31 200316.4617.20 200416.5016.76 200516.9216.64 200617.5216.90 200716.0616.45 200817.2516.71

7. Quarterly Duplicate

8. Comparison of TLD data to PIC data PICTLD 17.3116.45 18.0716.94 17.0315.58 15.4313.89

9. 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

10. 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

11. Lessons Learned It’s 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