Hydraulic Rabbits

Only the tubes inside the reactor and through the bottom plug are being provided in present construction. However, a tentative design for the entire system proposed by OBNL is outlined in Appendix 10. 

Typical Assembly of Liner, Plug, Radiation Door, and Shielding Pldg  

HG-1 to 4 - Liner Assembly. HG-1 to 4 - pings llI-2 and 3 - Mechanical Design /iHI-2 and 3 - Pings Plug Coffin 

VC-1 through 13 except VC-10 - Liner and Plug T- 2 Thermal Cbinmu T-2—V-1 ihermnl Column Liner T-2—V-1 Theriial Column Plug 

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The target island contains 31 positions for the aluminum-clad target assemblies. As presently operated, the target in the centerline position is replaced with a versatile hydraulic rabbit facility, which gives ready access to the position of... 

Z Begulatlng Rods. The regulating rods are designed to provide Continuous control of the reactor. White four location s are provided for these rods in the beryllium reflector (see Fig. 2.4.A), normally only one will be used for control with one more as a stand-by. The remaining two locations can then be used for hydraulic rabbit tubes. 

Entering, the bottom o f. the reac tor are. foui-hydraulic rabbits used for experimental purposes.- About 5 gpm of demineralized water is provided for each of these rabbits. ... 

The sub-pile room is directly below the reactor and is a shielded room allowing access to several experimental facilities and reaCtor components. The experimental facilities include two VG holes which originate at the top of the reactor and terminate in. the sub-pile room, the two standard hydraulic. rabbit.tubes which extend up alongside the active lattice, possible hydraulic rabbit tubes to be inserted into the shim or control rod locations,- and possible VT holes extending from the top of the reactor through the shim rod locations. In addition-to serving these facilities, the sub-pile room permits access to the canal and to several reactor components for- maintenance, repair,... 

The hydraulic rabbit system for the MTR consists of two 1-in.-I.D. vertical tubes through the east end of the beryllium reflector (see Beryllium Layout, Figs. 2.4.A and B) and a 1.310-in.-I.D. tube through each of the regulating rod holes not in use. 

The actual design of the shuttle is, of c ourse, best done by the MTR operator or the experimenter. If a shuttle design similar to that of the hydraulic rabbit system of the X-10 reactor is used, the. tubes should have a minimum radius of curvature of 48 in. The rabbit tube positions at the east end of the reflector will accommodate 1.190-in.-O.D. tubes, and the regulating rod holes will accommodate 1.500-in.-0.D. tubes. The inside diameters of these tubes have been set at 1.000 in. end 1.310 in., respectively. 

FLUOROTRIAZINES Riag-fluoriaated triaziaes are used ia fiber-reactive dyes. Perfluoroalkyl triaziaes are offered commercially as mass spectral markers and have been iatensively evaluated for elastomer and hydraulic fluid appHcations. Physical properties of representative fluorotriaziaes are listed ia Table 13. Toxicity data are available. For cyanuric fluoride, LD g =3.1 ppm for 4 h (iahalatioa, rat) and 160 mg/kg (skin, rabbit) (127). 

Intermediate-duration inhalation exposures to aerosols of a few organophosphate ester hydraulic fluids (Durad MP280 and "triaryl phosphate ester") produced lethal neurotoxic effects in chickens and rabbits (MacEwen and Vemot 1983 Siegel 1965). Rats and hamsters appear to be less susceptible to the neurotoxic action of organophosphate esters tests of several organophosphate fluids produced no deaths in rats exposed to substantial aerosol concentrations. 

Aerosols of Cellulube 220 produced deaths associated with severe dyspnea and mild diarrhea in one of two rabbits exposed to 2,000 mg/m3 for <4 hours/day, 5 days/week for 11 or 22 days (Carpenter et al. 1959). Continuous exposure for 30-160 days to aerosols of a triaryl phosphate U.S. military hydraulic fluid (see Table 3-2), at concentrations <110 mg/m3, produced no deaths in dogs or rats, but deaths associated with severe neurotoxic symptoms occurred in chickens exposed to concentrations >23 mg/m3 and in rabbits exposed to 102 mg/m3 (Siegel et al. 1965). Aerosols of Durad MP280 or Fyrquel 220 (continuous exposure for 90 days) produced no deaths in rats or hamsters exposed to 100 mg/m3. Deaths associated with lethargy, cachexia, and head droop occurred in rabbits exposed to 101 mg/m3 Durad MP280, but not in rabbits exposed to 100 mg/m3 Fyrquel 220 (MacEwen and Vemot 1983). Some of the Durad MP280-exposed rabbits were also infected with Pasteurella, which may have contributed to neurological symptoms. No deaths occurred in rats exposed to cyclotriphosphazene at 990 mg/m3, 6 hours/day,... 

Following intermediate-duration exposure to organophosphate ester hydraulic fluids, reversible rapid respirations were observed in rabbits exposed to 2,000 mg/m3 of a triaryl phosphate hydraulic fluid (Cellulube 220) (Carpenter et al. 1959) and reddish nasal discharge (likely to be indicative of respiratory tract irritation) was observed in rats exposed to 100 mg/m3 of Skydrol 500B-4 (Healy et al. 1992 ... 

Acute oral exposure to several organophosphate ester hydraulic fluids produced deaths in rabbits, chickens, and cows. The deaths were associated with severe cholinergic symptoms or symptoms of organophosphorus induced delayed neuropathy (OPIDN). (See Section 22.2 A for further details on the neurological effects.)... 

No deaths occurred in rats after dermal exposure to Durad 220B, Durad 300, or Durad 110 under occluded conditions for 24 hours at dosage levels of 2,000 mg/kg (FMC 1990a). Dermal exposure to 2,890 mg/kg doses of a cyclotriphosphazene hydraulic fluid for 24 hours under occluded conditions likewise produced no deaths in rabbits (Kinkead et al. 1992c MacEwen and Vernot 1985). Deaths associated with severe cholinergic symptoms and symptoms of delayed neuropathy occurred in a group of 50 cattle treated dermally with about 1.52 L of waste from reclamation of a Fyrquel hydraulic fluid (Julian et al. 1976). 

Several animal studies conducted histological examination of the heart following intermediate-duration dermal exposure to organophosphate ester hydraulic fluids. No cardiovascular effects were observed in rats exposed to 5,750 mg/kg/day of Fyrquel 220 (MacEwen and Vemot 1983), or rabbits exposed to 1,000 mg/kg/day of cyclotriphosphazene (Kinkead et al. 1989c, 1990) or an unspecified amount of Cellulube 220 (Carpenter et al. 1959). 

A cyclotriphosphazene-based hydraulic fluid produced no deaths, signs of neurotoxicity or histological alterations in the brain or sciatic nerve in rabbits after occluded dermal exposure at 1,000 mg/kg/day,... 

Dermal exposure of male rabbits to unspecified doses of Cellulube 220 (1-4 hours/day, 4-5 days/week for <46 days) did not elicit histological alterations in the testes (Carpenter et al. 1959). Dermal exposure of male and female rabbits to cyclotriphosphazene at doses < 1,000 mg/kg/day for 6 hours/day, 5 days/week, for 21 days did not affect the reproductive organs (Kinkead et al. 1989c, 1990). No other dermal studies examining reproductive effects in animals were located. This NOAEL value for reproductive effects in rabbits acutely exposed to cyclotriphosphazene hydraulic fluid is recorded in Table 2-8. 

Studies directly examining the metabolism of organophosphate ester hydraulic fluids in animals are limited. One study identified metabolites in ether extracts of bile obtained from rabbits given single,... 

Reliable intermediate-duration inhalation NOAELs and LOAELs were located for systemic effects in rats and rabbits exposed to several organophosphate ester hydraulic fluids (Durad MP280, Fyrquel 220,... 

Acute lethality studies in animals exposed by inhalation, ingestion, or dermal contact to several mineral oil hydraulic fluids indicate that mineral oil fluids are not potent toxicants. Mineral oil hydraulic fluids produced no deaths in rats after 4-hour exposures to aerosol concentrations of 110-210 mg/m3 or gavage administration of single doses <5,000 mg/kg (Kinkead et al. 1987a, 1988). Rabbits, likewise, did not die after single 24-hour exposures to occluded dermal doses of several mineral oil hydraulic fluids <2,000 mg/kg (Kinkead et al. 1985, 1987a, 1988). 

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