DOE 2000. - Waste Isolation Pilot Plant - U.S. Department of Energy

WIPP RH PSAR DOE/WIPP-03-3174 CHAPTER 5
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Vented DOT Type A (or equivalent) RH canister - Primary confinement
Underground Ventilation System - Secondary confinement
Design of fuel tank on forklift and hydraulic oil reservoir on HERE - Designed to minimize
leaks
The defense-in-depth ACs which are applicable to this scenario, per the criteria in Chapter 3, Section
3.1.3 are assigned as follows:
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No other vehicle movement is allowed during RH waste movement in the Underground.
Section 5.2.4.1, Evaluation of the Design Basis, discusses in greater detail: (1) the evaluation of safety
SSCs and (2) the applicability of functional and performance requirements (system evaluation) and
controls (TSRs). Detailed design descriptions for the above defense-in-depth SSCs may be found in
Chapter 4 and the applicable System Design Descriptions.
Source Term Development - A release from event 9-7 is prevented by the following passive design
feature.
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The W-170 drift leading to the diesel fuel storage area is 14 feet in width. The diesel fuel
storage area is over 1000 feet northwest of the waste shaft. The waste handling path to the
disposal area runs down the E-140 to the south. The largest bulkhead from the E-140 leading
to the W-170 drift is 9 feet in height. The 41 ton Forklift which is used to transport the facility
cask is 10 feet 6 inches in height. The design of the bulkhead doors prevent movement of a
loaded facility cask to the diesel fuel storage.
In addition to the passive design, multiple administrative controls and active design features are in place
to ensure that the quantity of fuel near the facility cask is limited.
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The maximum volume of diesel fuel in the Forklift is # 20 gal (75.7 L).
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There is not another facility cask containing a RH waste canister or any CH waste in the path of
the forklift transporting a filled facility cask to the disposal room.
A waste in transit notification system has been installed in the underground to alert personnel
when TRU Waste is being transported from the Waste Shaft Collar to the panel area for
emplacement. This is a series of amber strobe lights, when they are activated, all personnel in
E-140 shall evacuate the drift by going into a crosscut, and remain there until the lights are
turned off. However, the amber strobe light notification system is not required to be
operational as a prerequisite to waste handling activities. The backup notification, if the strobe
lights are inoperative, would consist of an announcement by the CMRO, a sweep of the E-140
and S-1950 drifts by the U/G Rover with subsequent verbal notification, and the placement of
temporary barriers (bi-folds with signs) in the E-140 drift.
Safety Structures, Systems, and Components - Due to no release from this event, Safety Class or Safety
significant SSCs are not required. The following data and assumptions are used in the frequency
analysis:
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Throughput of waste canisters is 208/year which translates to 208 forklift operations per year.
5.2-23 January 22, 2003