Jared Bower Robatel Technologies Roanoke, Virginia, USA

Transcription

1 Jared Bower Robatel Technologies Roanoke, Virginia, USA

2 What are Ion-? How is this waste typically managed? Can it be handled in a different way? How is Robatel s new method beneficial to cask users? How to ensure regulatory compliance? What tools are available to the user? Shipping Grossly Dewatered in the RT-100 2

3 Used to purify coolant water Extracts contaminates (sodium, silica, chloride, sulfates) from water circuits Form of intermediate or low level waste Average annual volume generated by commercial US nuclear power plants: 2,568 m³ (90,620 ft³) Source: USNRC, 2012 Gel-Type Anion Resin Source: Rohm and Haas Shipping Grossly Dewatered in the RT-100 3

4 Resin is transferred to a high integrity container (HIC) HIC is dewatered to less than 1% free-standing liquid HIC is loaded into a Type B cask and transported to disposal facility Designed to meet 10 CFR Part disposal requirements Dewatering Device Source: J. Mason Shipping Grossly Dewatered in the RT-100 4

5 10 CFR Part states the requirements for disposal In no case shall the liquid exceed 1% of the volume However, this requirement is for the disposal container Transportation container is limited by gas generation requirements Shipping Grossly Dewatered in the RT-100 5

6 Dewatering can take several days to complete If not shipped immediately, another attempt may be required Generator may take responsibility to ensure waste meets disposal requirements issue if moisture is higher than expected upon arrival Shipping Grossly Dewatered in the RT-100 6

7 Resin is transferred to a high integrity container (HIC) HIC is grossly dewatered to 20% freestanding liquid HIC is loaded into a RT-100 Type B transportation cask RT-100 is shipped to WCS (disposal facility) WCS processes resin to meet 1% freestanding liquid (disposal requirement) Shipping Grossly Dewatered in the RT-100 7

8 Generator takes on less risk (easier to justify 20% requirement) Generator may reduce exposure to site personnel Additional dewatering attempts may not be required May reduce transportation preparation time Dewatering process may be more simple Shipping Grossly Dewatered in the RT-100 8

9 Revision of the RT-100 Safety Analysis Report Contents include grossly dewatered resins Revision of containment analysis Ensure that H₂ gas does not exceed flammability limit New Certificate of Compliance issued in July 2015 Shipping Grossly Dewatered in the RT-100 9

10 H₂ gas accumulates in sealed containers Caused by radiolysis of hydrogenous material Volume fraction of Hydrogen in air should not exceed 5% Follow the guidance of NUREG/CR-6673 Shipping Grossly Dewatered in the RT

11 RT-100 Transportation Cask Polyethylene Liner Shoring Ionic Resin Ionic Resin submerged in free water Shipping Grossly Dewatered in the RT

12 Determine the G-values for the contents Establish volume ratios (fraction of decay heat absorbed by each content type) Establish free gas volume Calculate D H,max = ƒ( V waste ) Provide useful tools to cask users Shipping Grossly Dewatered in the RT

13 Easy tool for user to evaluate maximum allowable decay heat Can be used for most cask shipments Certain criteria must apply, including: Loading at max temperature of 38 C and standard atmospheric pressure Shipment time limited to 10 days Must use specified liner types Shipping Grossly Dewatered in the RT

14 Decay Heat (Watts) Waste Volume (ft³) Shipping Grossly Dewatered in the RT

15 In the form of an Excel Table User input variables: Loading Temperature and Pressure Volumes (secondary container, shoring, filters, ionic resin) Gamma/Alpha Decay Heat Distribution Either Decay Heat or Shipment Time Calculates Allowable Decay Heat or Maximum Shipment Time Shipping Grossly Dewatered in the RT

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17 In this example, a known shipment time is used to calculate the maximum allowable decay heat. Shipping Grossly Dewatered in the RT

18 are typically dewatered prior to shipment Liner is certified as containing <1% free-standing liquid A new approach allows up to 20% liquid during transport Saves the generator time and reduces cost May reduce personnel exposure Reduces risk of CoC violations Shipping Grossly Dewatered in the RT