LBNF LongBaseline Neutrino Facility Ross Shaft Cage Joshua

LBNF Long-Baseline Neutrino Facility Ross Shaft Cage Joshua Willhite & Emily Collett December 2016

Background of Events • CF team has been working to add dual dimensions and update the “SURF Facility Access Specifications Technical Memorandum” found in Doc. DB 328. We’re working on some new graphics to finalize it, hopefully in January. A draft version has been uploaded recently • Historic double deck cage dimensions were assumed in the original document in order to conduct slung load analysis for the Ross shaft. 2 12/5/2016 Willhite & Collett | Ross Shaft Cage LBNF

APA Crate Dimensions • It was determined that the APA crate, size found in Doc. DB 229 of 1. 3 m x 2. 8 m x 7. 3 m (4. 3’ x 9. 2’ x 24’), would be too tall to be slung under the historic double deck design using a standard or special sling. Ross Standard Sling 3 12/5/2016 Willhite & Collett | Ross Shaft Cage Ross Special Sling LBNF

Ross Cage Design Change Options • We could increase the length of the cage to fit the APA crate inside, however several issues arise: CF excavation equipment may not fit inside because the cage reduces the width constraint by approximately 4” (100 mm) compared to a slung load. - Additional length will increase the weight of the cage, which reduces the weight capacity for slung and cage loads. - • Alternatively, we could decrease the length of the cage and utilize a single deck design. Using the Yates cage as a reference, this cage could deliver 30 people per trip for regular service and 36 people for emergency service. At 4 trips/hour (with the faster cage speed), underground occupancy would be 144 (4 x 36). - - 4 This appears to be the best option. 12/5/2016 Willhite & Collett | Ross Shaft Cage LBNF

Ross Single Deck Cage Design • An example of a beam slung under a cage is shown, with the key “fixed” dimensions noted • Using the highest safe hoist height, the attachment pin to the floor is ~50’ (15. 2 m) • We deduct the distance from the pin to the top of the cage sidewall, thickness of the cage floor, and minimum sling length to get the useful height. CAGE • This leaves ~37’ (11. 3 m) to divide between slung load height and cage height. • Subtracting 25’ (7. 6 m) for the APA crate (1’ (0. 3 m) clearance) makes the other component (cage or slung load) 12’ (3. 6 m) tall. 5 12/5/2016 Willhite & Collett | Ross Shaft Cage SLUNG LOAD LBNF

Ross Single Deck Cage Design • 6 Initial slung load analysis proves this to be a viable option. 12/5/2016 Willhite & Collett | Ross Shaft Cage LBNF

Ross Single Deck Cage Design Conceptual Design Note that this area is partially obstructed in the center by the dogging system, but the roof can also be hinged to extend longer loads above the cage (like the cryostat corner beam) 4’ 7” [1. 40 m] 11’ 6” [3. 5 m] 12’ ½” [3. 67 m] 7 12/5/2016 Willhite & Collett | Ross Shaft Cage LBNF

3. 5 m Cage Trouble Components (i. e. likely to be slung, or consider a 4. 0 m cage) (longer components not shown) • 8 Standard means for transporting loads into the cage require higher clearances 12/5/2016 Willhite & Collett | Ross Shaft Cage LBNF

A reminder about other constraints Currently, the cavern entrance doors are 8’ 2” (2. 5 m) wide by 12’ (3. 66 m) tall. Utilities prevent increasing the height without changing the excavation 3. 608 m corner beam won’t fit through door (or under the utilities) vertically when on a rail car It barely fits on an 18” (0. 45 m) cart at an angle It’s even tight on an 8” (0. 2 m) cart at an angle 9 12/5/2016 Willhite & Collett | Ross Shaft Cage LBNF

4 m Cage Alternatives for Slung Loads • If a 4 m cage is utilized, the APAs cannot be transported using a standard sling unless further design changes are engineered: - Flattening the ceiling of the cage could gain an additional ~10” [254 mm]. - Reducing the length of the connection between the cage and slung load: Currently 7’ [2134 mm] is required to safely reach the end of the sling. Therefore, a special means of connection would be necessary to reduce this length. • - 10 Special Sling Potential for using winches to safely load a component then shorten the cable under the cage, further engineering required. Utilizing a special sling can increase the allowable height by 5’ [1524 mm] but will decrease the width by 0. 5’ – 1’ [152 -305 mm] to allow for suspension points on the side of the load 12/5/2016 Willhite & Collett | Ross Shaft Cage LBNF

Summary • The APA crates are a critical driver for the Ross Shaft cage design due to size, quantity, and value. • The best option to accommodate the APA crates appears to be reducing the length of the cage from a double deck to a single deck so the APA crates can be slung below the cage. • This will reduce the ability to transport personnel, but the logistics study suggests this will not impact the project. 30 people at 4 trips/hour will allow for 120 people/hour during normal operation, 144 during and emergency. • A single deck cage is not expected to significantly impact the transportation of components both inside the cage and slung under the cage. • A 3. 5 m internal height cage appears to accommodate most loads without significantly changing the cage design from historic designs. A 4 m height could accommodate more loads, but would more challenging to design. We’d like input on whether this is worth pursuing. 11 12/5/2016 Willhite & Collett | Ross Shaft Cage LBNF