1. Jan. 13,2003 Bill Miller, U of M Off-Axis Detector Quick Overview of Potential Detector Hall Gas Handling Some Soudan numbers ODH Flammable Gas

2. Jan. 13,2003 Bill Miller, U of M Possible Detector Hall Large 30 ft overburden makes it cost effective to put hall underground and use stable rock for sidewalls. Does raise some materials handling issues. More details on Detector Hall costs at meeting next week.

3. Jan. 13,2003 Bill Miller, U of M Detector Hall Dimensions Detector Area –100m long x 20m wide x 20m tall Detector hall –This includes lifting bays, storage, office areas, egress walkways, access levels, stairs, elevators and mechanical area. –148m long x 28m wide x 29m tall Long 120m loading dock ramp to get loading bay under crane

4. Jan. 13,2003 Bill Miller, U of M Cross Section Off-Axis Hall

5. Jan. 13,2003 Bill Miller, U of M Side view of Detector Hall

6. Jan. 13,2003 Bill Miller, U of M Floor Plan-Detector Area

7. Jan. 13,2003 Bill Miller, U of M Floor Plan-Loading Bay

8. Jan. 13,2003 Bill Miller, U of M Gas Handling Since the detector is note very far underground it is feasible to pipe from surface building. This makes gas delivery simple It is assumed that a gas mixing system would be used for the large volumes needed.

9. Jan. 13,2003 Bill Miller, U of M Soudan 2 Main Detector Argonne/15% CO2 gas mixed underground using dewers of Argonne and K bottles of CO2. We used on average about 200 cubic feet per day. The gas system tracked with the barometer keeping 2” water overpressure. We used a gas re-circulation system with DeOxo’s to remove oxygen. The detector had enough leaks the gas system did not exhaust except for very severe storms. We had 3600 m of gasket sealed cracks, 3600 m of 1” nylon return hose, 4500 m of 3/8” nylon supply hose, 1800 sweglock fitting, 4 gas pumps with DeOxo's and charcoal filters. Total gas volume about 9600 cubic ft.

10. Jan. 13,2003 Bill Miller, U of M Soudan 2 Veto Shield The Veto Shield consisted of roughly 1700 modules. Average size was 7 m long x 10 cm x 20 cm. Total gas volume is about 8600 cubic ft. The Veto shield used a similar re-circulation system with a DeOxo to remove O2. The Shield had 13,600 epoxied wire connections, 6800 connections and thousands of feet of 3/8” nylon hose. Total leak rate was about 50 cubic ft/day

11. Jan. 13,2003 Bill Miller, U of M Total Soudan Gas Usage Approximately 18,220 cubic ft of gas volume (600 cubic meters) Total leak rate/top-up rate of about 250 ft/day (8.5 cubic meters) Volume of cavern 550,00 cubic ft (19,000 cubic meters) NO ODH problems

12. Jan. 13,2003 Bill Miller, U of M ODH in Off-Axis Hall Detector Volume comparison: –Soudan=600 cubic meters –Off-Axis=2400 cubic meters Detector Hall comparison –Soudan=19,000 cubic meters –Off-Axis=120,000 cubic meters Wild guess of leak rate : –Soudan rate 8.5 cu. m/day –Off-Axis (4x Soudan)=34 cu m/day Should still be OK for Oxygen levels

13. Jan. 13,2003 Bill Miller, U of M Flammable Gas Problems Gas detection devices needed Proper collection of leaked gas and venting out of cavern Emergency venting for power outages Mix gas in separate building on surface and pipe underground