22 WIPP Future Advancements and Operational Safety
-
Upload
sandia-national-laboratories-energy-climate-renewables -
Category
Technology
-
view
56 -
download
0
Transcript of 22 WIPP Future Advancements and Operational Safety
WIPP Future Advancements and Operational Safety
Rodney L. Whisenhunt, NWPSenior Project Manager, Capital Asset Projects
Historic Ventilation Modes at WIPP●Normal Mode - 2 main 700 fans in unfiltered operation – up
to 480,000 cfm●Alternate Mode - 1 main 700 fan in unfiltered operation –
280,000 cfm●Filtration Mode - 1 860 fan in filtered operation – 60,000 cfm●Operating one or two 860 fans in unfiltered (by-pass) mode
(reduced and minimum flow)●Operating a main 700 fan in parallel with a unfiltered (by-
pass) 860 fan (maintenance)
Note: Airflows shown are nominal and at surface fan location
Current Filtered Ventilation System – Adding the Interim Ventilation System (IVS) fans
●IVS added two additional filter units●Two 960 fans with each fan having a 27,000 cfm
capacity●Flow increased to 114,000 cfm●Limited ability to provide ventilation to the
construction and north circuits●Does allow for limited emplacement operations
Filtered Ventilation System with Supplemental Ventilation System (SVS)
Fan in Operation●Exhaust flow is with UVS/IVS at 114,000 cfm at surface●SVS fan will pull air from the AIS and course the air to the
North and Construction Circuits●The Salt Handling Shaft will be on exhaust●Air to the disposal circuit is fixed at the UVS/IVS fan flow.
Air to the disposal circuit will be from the construction circuit
Long Range WIPP Planning
●WIPP was originally designed for 8 Panels with options for Panels 9 and 10.
●For planning purposes, NWP was directed by CBFO to extend the mission need to the year 2050.
●Other project direction was:●All exhaust air will be filtered from the disposal and
waste shaft station (NO unfiltered exhaust).●All underground activities, maintenance, waste
handling, mining, etc. will be performed in parallel.
Long Range Ventilation Goals at WIPP
●The use of the UVS/IVS/SVS systems will NOT be capable of meeting these long term goals at WIPP
●The original WIPP ventilation system will NOT be capable of meeting these mission statement needs.
●An upgrade to the surface exhaust and filter system is required
Long Range Ventilation Design Basis
●Assumed new panels would be constructed to the west of the existing repository.
●Panels would be identical to existing panels (room width and height, number of rooms, length of rooms, space between panels, and similar access airways)
●A repository life to the year 2050●From the receipt rate to 2050, the maximum
number of additional panels was estimated at 13
Long Range Ventilation Design Basis●Five main airways developed to the west. With
five airways, two will be for disposal intake.●Allows for ground control functions in one of the
intake mains without impacting waste handling operations.
●Mining will progress in a clockwise manner starting to the south nearest the existing repository mains●Minimizes mining to complete Panel 11 ●Reduces ventilation demand in early years
Long Range Ventilation Design
●Even without the radiation event in 2014, the Mission statement to emplace to 2050 would result in the need for:●New surface fans to accommodate distance to furthest panels●New shaft to replace aging Salt Handling Shaft and enhance
material handling capabilities●New shaft to separate construction air from disposal exhaust●New mining equipment (age of existing equipment would need
to be phased out)
WIPP Upgrade Projects
●Two new projects are considered to achieve the mission statement:●New surface fans with new filter system (sufficient for all
exhaust air as per DOE direction).●New shaft (to achieve long term goals at WIPP regarding
hoisting and separation of construction [mining] and waste handling operations)
Current New Filter Building (NFB) Design
●Principal underground ventilation design criteria for NFB●Maximum airflow of 540,000 cfm (at the fans)●Consider a salt reduction system to minimize salt
dust from reaching containment filters
ES Project
●A new intake shaft results in all construction (mining) air to be routed to the AIS for exhausting to surface●Eliminates a significant dust source to Exhaust Shaft
filtration system and possibly eliminates the need for a salt reduction system on surface
●Greatly reduces any salt build up in duct work on Exhaust Shaft
Hoisting System in New Shaft
• The current project does not include a hoisting system
• A separate project is being considered to install a hoisting system in the new shaft.
New Shaft with Hoisting Capability
●The need for a hoisting system is based on the following criteria:● Increased salt handling operations● Increased personnel and materials handling operations
●The design would allow for salt skipping and personnel and material handling operations to occur simultaneously ●At least doubling current salt skipping operations●Large equipment can be hoisted via a large conveyance●Emergency egress is significantly enhanced
New Shaft with Hoisting Capability●Basis of new hoisting system design
●Need to replace existing Salt Handling Shaft (SHS)●The SHS has been in operation since the early 1980s and was
designed for a 25 year life (currently over 30 years old)●The current SHS is a small 10 ft. diameter shaft with
significant corrosion on internal shaft components. ●At some stage this shaft will need a major overhaul – which
will result in a cessation of salt skipping from the underground during shaft renovation.
●A complete shaft overhaul with updated controllers on the hoist system could take up to 12 months.
●This will impact mining to new panels to the west.
New Shaft with Hoisting Capability●The need for a hoisting system is based on the following
(continued):●The SHS has only an 8 ton skipping capacity for salt removal.
Bottlenecks were common with this limited skip capacity (storing salt in underground airways waiting to be skipped)
●The SHS has two functions, personnel and material conveyance and salt removal. The two functions CANNOToccur simultaneously.
● If the SHS is skipping salt, then all personnel and material handling is moved to the Waste Shaft – potentially limiting any waste handling operations.
Shaft Conveyances and Shaft Diameter●Twin skips – doubling salt hoisting capacity ●A 12 ft. x 18 ft. personnel and material
conveyance:● Increased productivity since personnel can be sent
underground more efficiently● Increased productivity in handling supplies, e.g. rock
bolts, mesh, equipment, diesel fuel, etc.● Can handle about 100 personnel in an emergency
(egress) and is closer to new panel development then the Waste Shaft or SHS – A Significant Safety Improvement
●A 12 ft. x 18 ft. personnel and material conveyance with two skips and up to 500,000 cfm results in a shaft diameter of 30 ft. (26 ft. finished)
Access to
Cage
Skip Skip
12 ft x 18 ft
Personnel
and Materials
Cage
Counterweight
15 ft13 ft
6 in
chco
ndui
t
Access to
Cage