CDL Specific Flashcards
What is the mass limit of building C6 per criticality safety controls? Per accountability controls?
700 FGE per crit safety, 2,000 FGE per accountability
What are the current crit zone limits?
130 FGE for 13-14, 16-22, and 260 FGE for 15
Name each KENS (7 total, assume TCN-02 is active)
- CZ 15 is limited to 260 FGE. All others are limited to 130 FGE.
- Each CZ is limited to 200 mL, cumulative, of any moderator evaluated to be more effective than petrolatum within the immediate vicinity of fuel.
- Each crit zone is limited to 10 kg graphite, or 20 kg natural/depleted uranium.
- Each cz is limited to no more than 40 FGE openly exposed in locations where moderators are not required to be evaluated.
- For accountable nuclear material transfers into and out of the 260 FGE cz, the criticality custodian must verify enrichment by either 1) ensuring physical labeling (i.e., identification and enrichment) and net weight (via use of gross and tare weights) is correct or 2) using MCA readings
- All fuel transfers not performed under CSI controls, including those to or form a different MBA, are limited to 65 FGE
- For transfers of a loaded 9979 container, two fuel handlers shall independently confirm the available margin in the destination zone and that the correct container has been transferred to the correct zone.
What are the CSI zones in CDL? Limits? Max CSI allowed per container?
CDL Ship (Room 1) and CDL Store (Room 6). 50 CSI per zone, 10 CSI max per container
What does ‘openly exposed’ mean in the context of KENS 4?
Defined as not sealed within packaging, and therefore able to be intermixed with moderators
When do moderators require evaluation in the CDL?
When the moderator will be used in the immediate vicinity of fissile materials (aka, in the glovebox)
What are some examples of approved unattended off-shift operations?
- Furnace ops
- Preps in 14 and 15
- Drying/filtering
- A800
- LFA/STA/TGA
- BET/PSA
- Doser
- Met mount processing
- Special treatments
What are some examples of fissile accumulation control in the laboratory?
- Ductwork
- Sumps
- A300 system
- A300 sump
- Furnace ops
- A800 system
- A800 vacuum
- Traps and filters
- LECO
How are moderators controlled in CDL?
No evaluations are needed for materials outside of gloveboxes.
For moderators within gloveboxes, evaluation is required. If less effective than petrolatum, no controls.
If more effective than petrolatum, 200 mL cumulative limit in effect unless justified to be incidental.
What does the UML model assume in it’s design? How is it used in the CDL?
Optimally moderated spherical slurry with all of the fuel assumed as a single sphere, surrounded by a tight-fitting reflector and an effectively infinite water bath outside of the reflector.
The UML is used to bound casualties within the CDL, and verify CDL stays under the DCC.
What is CDL’s primary moderator? What are some examples of controlled moderators?
Petrolatum.
Apiezon grease, Corrozip-LF, Klubersynth oil, microthene, PVA, Renolin B 11 VG 37 (oil), Shell tellus hydraulic oil, struers antistick, WD-40, tris(hydroxymetyl)aminomethane
Why is KENS 4 (40 FGE limit when openly exposed outside of a glovebox) required?
Because CDL does not control or evaluate all moderators outside of a glovebox, but within a crit zone.
What are some reasons why CDL does not have to have a CAS?
- FHA limited to 700 FGE
- Natural phenomena hazards evaluated using Bettis example, and found subcritical. Operational casualties discussed in CSE.
- Presence of fissile material in packaged, TID’d CSI containers does not significantly increase the risk of criticality
What are the plausible, unlikely casualties that could happen in the CDL?
- An increase in mass due to overloading fuel
- An increase in moderation by moderators more effective than petrolatum
- An increase in reflection by controlled reflector materials
What is the most limiting double casualty that could occur in the CDL?
Increase in fissile mass casualty paired with another increase in fissile mass casualty (keff 0.9485)
