closure project manager - Document Request - U.S. Department of ...

The extremely unlikely impact of a transport vehicle fire at the dock on a transport
vehicle inventory was determined to be a beyond extremely unlike& event based on the
analysis of vehicle fires presented in NSTR-0 15-97, SaZt Stabilization Program
Transportation Risk (Ref. ZO), and in NSTR-018-97, Evaluation of Risk Associated with
Transportation Activities within the Protected Area (Ref. 2 1). These reports evaluated
the possibility of a vehicle fire initiated by an electrical malfunction or short that results
in a fire in the engine compartment. The evaluations assumed that the fire spreads
through the fuel system or spreads via leaking fuel until it breaches the vehicle fuel tanks.
The transport vehicle fire scenario was postulated to occur regardless of whether the
transfer vehicle is located at the dock or in transit. These reports determined there were
no credible transport vehicle fue events at the building docks and the analysis performed
was determined to be appropriate for the Building 991 Complex docks, therefore no
further analysis of this event was performed.
The extreme& unZikeIy impact of a direct flame impingement torch fre on a single POC
container was determined to be a beyond extreme& unIikeIy event based upon the work
controls that have to be in place when doing hot work and the substantial construction
(i.e.,radioactive material packed in metal boxes which are inside a pipe component
which is surrounded by packaging which is inside a metal drum). No further analysis of
this event was performed.
SDill Scenarios
Spill Scenario 1 - TRU Waste Drums Drop/Fall: This spill involves the contents of
four 55-gdon waste drums. These drums are assumed to be breached due to impact with
a concrete surface from a drop/falI from a height greater than four feet. The four drums
are un-banded and on a pallet that is being stacked on the third tier or the stacked drums
are impacted by material handling equipment and four drums fall from the third tier.
This scenario bounds other mechanisms for container breach due to the anticipated
frequency of the scenario and due to the effective h4AR involved in this scenario.
Spill Scenario 2 - Facility Structural Failure Spill: This scenario involves 55-gallon
TRU waste drums being breached due to structural failure of the hallway where the waste
containers are stored. This scenario bounds other mechanisms for facility structural
failure caused spills due to the unlikely (TRU waste drums) frequencies associated with
the scenario.
Puncture Scenarios
Puncture Scenario 1 - LLW, TRU, POC, and Type B Container Punctures: This
puncture scenario involves the contents of either a LLW, TRU, POC, or TypeB
container. LLW and TRU waste containers are assumed to be breached during
movement operations due to a forklift tine puncture of the container. The Duncture of
POC and Type €3 containers will be evaluated to determine Dotential consequences but is
not considered to be a credible accident scenario. The wooden LLW crate puncture can
occur in the West Dock Canopy Area (at the time of lifting for removal from storage or
Revision
Scmtcmherl999 ,
4-20 Building 99 1 Complex FSAR
.