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

WIPP RH PSAR DOE/WIPP-03-3174 CHAPTER 5
Estimated Noninvolved Worker and MEI Consequences and Comparison to Risk Evaluation Guidelines -
Based on the values for the source term variables as presented above, the worst-case, no-mitigation MEI
and noninvolved worker consequences (Appendix E Tables E-18 and E-19) of event 9-1 are well within
the radiological and non-radiological risk evaluation guidelines for the extremely unlikely range. The
non-radiological results meet the guidelines (i.e., the sum of ratios < 1) when all the chemicals are added
(Tables E-20 and E-21).
Assessment of Immediate Worker Consequences - No immediate worker consequences are calculated for
NC1 because no workers are in the Hot Cell, the operation is done remotely.
Safety Structures, Systems, and Components - Based on the consequence analysis results for this
accident, Safety Class or Safety Significant SSCs are not required. The following input data and
assumptions are used in the frequency and source term analyses:
C
Maximum PE-Ci content of 10-160B cask is 20 PE-Ci.
C
C
C
C
C
C
A combustible materials control program is established for the Hot Cell that ensures insufficient
fuel and location of fuel so that a fire in the Hot Cell would not be of sufficient magnitude to
damage multiple waste drums.
The Hot Cell walls constitute an effective fire barrier to keep a fire originating outside the Hot
Cell from propagating into the Hot Cell and to keep a fire that originates inside the Hot Cell from
propagating to outside areas.
The maximum hazardous material weight contained in a waste drum is 243 pounds.
No more than six fully loaded and one partially loaded facility canisters are stored in the Hot Cell
at any one time. Also, only ten waste drums removed from a 10-160B cask and not in facility
canisters can be in the Hot Cell.
The hazardous chemical inventory in the RH waste is the same as for the CH waste.
A 10-160B cask can contain no more than 10 waste drums.
C Total number of waste drums handled in one year in the Hot Cell is 2080.
The defense-in-depth SSCs which are applicable to this scenario, per the criteria in Chapter 3, Section
3.1.3 are assigned as follows:
C
Vented DOT Type A waste drum - primary confinement
C
C
WHB Ventilation System - secondary confinement
Design of Hot Cell - designed to minimize fires
5.2.3.11 NC2 Fire in the Underground
According to Section 5.2.3.1 (RH1), the fire in the underground that causes a release of hazardous
materials (radioactive and chemicals) from the facility cask or from a 72B waste canister is not possible.
Therefore, a fire during processing the facility cask containing a facility canister of 10-160B waste in the
underground would not cause a release of the hazardous materials. The design features and controls
credited in the Section 5.2.3.1 will be applicable during the processing of 10-160B waste.
5.2.3.12 NC3 Loss of Confinement in the WHB
5.2-51 January 22, 2003