CH-TRAMPAC - Waste Isolation Pilot Plant - U.S. Department of ...

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CH-TRAMPAC Document Rev. 2, May 2005Table 5.2-11 – Maximum Allowable Total Gas Release Rates for WasteType IV55-Gallon DrumDirect Load SWBWaste Type IV Payload Container55-gallon drum in SWB overpack85-Gallon Drum, 85-Gallon Drum Overpack, or 55-GallonDrum in 85-Gallon Drum Overpack100-Gallon DrumMaximum Allowable TotalGas Release Rate(mol/s/container) 3.97E-061.98E-059.87E-065.90E-061.02E-05Notes: The maximum total gas release rates (in moles per second per payload container) were determined fromanalysis as described in Section 3.4.4 of the TRUPACT-II 7 and HalfPACT 8 SARs. If the measured gas release rate exceeds the maximum total gas release rate per container, the container mayqualify for shipment using the methodology for evaluation of compliance with the payload total gas release ratelimits described in Section 6.2.5.[G][H][I]Record the measured FGGR for the payload container (Section 5 of the Data Sheet).If flammable VOCs are present in the container headspace at concentrations less than orequal to 500 ppm, as determined in Step B, determine the maximum allowable hydrogengas generation rate for the corresponding shipping category (as listed in Table 5.2-1 or asdetermined in accordance with the methodology described in Section 5.2.3). Record themaximum allowable hydrogen gas generation rate (Section 5 of the Data Sheet).Compare the measured FGGR to the allowable rate limit.If the measured FGGR of the container is less than or equal to the maximum allowablehydrogen gas generation rate for the corresponding shipping category, then the containermay be shipped if compliance with all other transportation requirements is demonstrated.If the measured FGGR of the container exceeds the maximum allowable hydrogen gasgeneration rate, the container may be reassessed for compliance with transportationrequirements through the evaluation of a payload with different shipping categories ordunnage containers, as described in Section 6.2.4. Otherwise, the container shall bereconfigured or mitigative measures shall be adopted.If VOCs are present in the container headspace at concentrations greater than 500 ppm,as demonstrated in Step C, calculate the predicted innermost confinement layerflammable gas concentration (X inner ) at the end of the shipping period as:Xinner= CG * R Twhere,CG = Measured FGGR (mole/second)5.2-44
CH-TRAMPAC Document Rev. 2, May 2005[J][K][L][M]R T= The total resistance to hydrogen release (second/mole) (see Appendix 2.2 ofthe CH-TRU Payload Appendices 1 ).Record the calculated innermost confinement layer flammable gas concentration(Section 5 of the Data Sheet).Calculate the MLEL as described in Section 5.2.5.3.5. Record the MLEL (Section 5 ofthe Data Sheet).Calculate the sum of the concentrations of the flammable gas in the innermostconfinement layer and the flammable VOCs in the innermost confinement layer. Recordthe sum (Section 5 of the Data Sheet).Compare the sum of the flammable gas and flammable VOC concentrations within theinnermost confinement layer to the calculated MLEL. Indicate by (Yes/No) if the limit ismet (Section 5 of the Data Sheet).If the sum of the flammable gas and VOC concentrations is less than or equal to theMLEL, then the container may be shipped if compliance with all other transportationrequirements is demonstrated.If the sum of the flammable gas and VOC concentrations exceeds the MLEL, thecontainer may be reassessed for compliance with transportation requirements through theevaluation of a payload with different shipping categories or dunnage containers, asdescribed in Section 6.2.4. Otherwise, the container shall be reconfigured or mitigativemeasures shall be adopted.In cases of overpack configurations with multiple containers (drums in an SWB orTDOP), the configuration must be assessed under the logic of Section 6.2.4 andAppendix 2.4 of the CH-TRU Payload Appendices. 1If the above relevant limits are met, the payload container satisfies the test category criteria. Ifthe Data Sheet is used to document compliance, then the Data Sheet is signed by theTransportation Certification Official. If compliance is determined using a verified/validatedsoftware package, then the necessary data are stored electronically and the TransportationCertification Official signs the completed PCTCD or OPCTCD, as appropriate. The payloadcontainer qualifies for shipment after verification of all of the transportation parameters.Containers that do not meet the test category criteria may be qualified for shipment inaccordance with Section 6.2.4 and/or Section 6.2.5. If the payload container cannot be qualifiedfor shipment, the container must be segregated for repackaging or reprocessing.5.2.5.5 Implementation of Unified Flammable Gas Test Procedure Long-TermObjectiveThe long-term objective of the UFGTP is applied to a population of containers with consistentgas generation properties. The long-term objective of the UFGTP may be implemented once therequired data have been collected through measurement and/or testing for a subpopulation ofthese containers. If a bounding FGGR value for compliance determination can be establishedand shown to be below the maximum allowable FGGR for the population, no further need existsto test every container in the population. If the bounding FGGR value exceeds the maximumallowable FGGR, the population will continue to be processed under the measurement and5.2-45
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