OM TERPHENYL SUBSTITUTION FOR DIPHENYL IN THE OMRE
Changes in operational performance of the OMRE which might be expected as a result of changing the coolant-moderator from Diphenyl to OM Terphenyl are considered. The desire to initiate operation of the OMRE with OM Terphenyl stems primarily from the needs of the organic moderated power reactor program, in which the reference design presupposes thc use of Santownx R as the moderator coolant. The principal advantage of Santowax R over Diphenyl in the OMR is the reduction in vapor pressure, thereby resulting in the design of a system which operates at a lower pressure. The advantages of a low pressure system are many fold, the principal ones being a reduction in system costs and a decrease in the amount of dissolved gas present in the system. While OM Terphenyl does not have the exact physical properties of Santownx R, their properties are sufficiently alike in the important variables (i.e., vapor pressure, viscosity, density) to make the study of the operational performance of OM Terphenyl closely correspond to a study of Santowax R. Furthermore, the fact should not be overlooked that irradiated Diphenyl containing moderate amounts of high boilers tends to look much like OM Terphenyl in these same important physical properties. Hence, the basic consideration between Diphenyl and OM Terphenyl is probably one of initial operation rather than that of long term operation where the irradiation effects indicated above tends to reduee the differcnce between the two systems. Discussed are the expected performance eharaeteristics for unirradiated systems, the one being Diphenyl, the other OM Terphenyl. In general it will be noted that the differences obtained are not great, indicating that the substitution of OM Terphenyl for Diphenyl in the OMRE does not compromise the OMRE program objectives. (auth)
- Research Organization:
- Atomics International Div., North American Aviation, Inc., Canoga Park, Calif.
- NSA Number:
- NSA-12-004459
- OSTI ID:
- 4342478
- Report Number(s):
- NAA-SR-Memo-1935
- Resource Relation:
- Other Information: Orig. Receipt Date: 31-DEC-58
- Country of Publication:
- United States
- Language:
- English
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