Table 4-11. ARFs and RFs During the Heating of Reactive Compounds in Flowing Air

DOE-HDBK-3010-94

4.0 Solids; Powders

Table 4-11. ARFs and RFs During the Heating of Reactive Compounds in Flowing Air

(Tables VI, VIII & X - Mishima, Schwendiman and Radasch, July 1968

and Table IV - Mishima, Schwendiman and Radasch, November 1968)

Temperature, oC

ARF1

Air Velocity, cm/s

Air-Dried Plutonium Nitrate

1000

6.2E-5

400

1.9E-5

700

2.3E-4

1.5E-32

1000

100

400

1.7E-4

700

1.3E-4

1000

1.9E-4

1.3E-4

Sum of material collected on foil chimney liner and filter sealing chimney.

Size distributions determined by optical microscopy indicates a RF <1E-5 to <1E-8. May

indicate that oxides formed at high temperatures sinter together during oxidation forming

aggregates that are larger in size.

The maximum and median ARFs for fluoride appear to be an order of magnitude less with

less variability for individual measurements. Therefore, a bounding ARF value is assessed

to be 1E-3 for this compound.

The upsweep air velocities used during the tests appears to be adequate to entrain all

significant particle sizes as shown in Figure 4-14 reproduced from Mishima, Schwendiman

and Radasch (November 1968). The size distributions of the airborne materials during the

heating of some compounds are shown in Figures A.28, A.29a, A.29b, A.29c and A.30 in

Appendix A. The sizes designated on the graphs are equivalent spheres (the linear diameter

of the particle) and, since the theoretical density of PuO2 is 11.46 g/cm3, the sizes must be

multiplied by 3.4 (the square root of the density) to arrive at the approximate diameters in

AED. The RF estimated from the size distribution plots indicate a value ~ 1E-5 to 1E-8

associated with ARFs ranging from <7E-4 to 8E-3. Although the RFs measured appear

relatively consistent associated with ARFs spanning the range of ARFs found for all

materials, the values are very small and a RF of 1E-3 is assessed to be bounding for all these

materials under these conditions to provide a high degree of conservatism.

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