No abstract

The over-all design and operation is reviewed in the light of four years of operating experience. Items discussed consist of the reactor components and instrumentation, reactor and pool cooling systems (including system cleanup), the emergency systems for electric power and reactor cooling, the waste-disposal systems (liquid. gaseous, and solid), and the building, itself.No effort is made to describe the features of the ORR which make it the useful research tool that it is.The ORR was the first of a class of reactors which combined the features of both the pool-reactor and tank-reactor types. Four years of operation have indicated areas where problems of various degrees have developed. These are discussed to enable reactor operators who are operating or anticipate operating reactors similar to the ORR to avoid some of these problems.

This report was prepared a~ an account of ~ork sponsored by the United States Government_. Neither the United States nor the United Slates Atomic Energy Commission nor any of their employees, nor any of their contra~tors, subcontractors, or their employees, makes any warranty, express or implied, or assumes any legal liability or re~ponsibjlity for the DCC\!!~CV • completeness or usefulness of any information, app~ratus, product or process disclosed, or re~resents that its use 1 would not infringe privately owned nghts. NOTICE This document contains information of a preliminary nature 1rnd was prepared primarily for internal use at the Oak Ridge National Laboratory. It is subject to revision or correction and therefore does not represent a final report.

This report was prepared as an account of work sponsored by the United States Government. Neither the United States nor the United States Atomic Energy Co'!'mission, nor any of their employees, nor any of the1r contractors, subcontractors, or their employees, makes any warranty, express or implied, or assumes any legal liabi~ity or responsibility for the accuracy, completeness or usefulness of any information, apparatus, product or process disclosed, or represents that its use would not infringe privately owned rights. NOTICE This document contains information of a preliminary nature and was prepared primarily for internal use at the Oak Ridge National Laboratory. It is subject to revision or correction and therefore does not represent a final report.

This report was prepared as an account of work sponsored by an agency of theunited States Government. Neither the United States Government norany agency thereof, nor any of their employees, ContractQrs, subcontractors, or their employees, makes any warwnty, exprm or impliod, nor noaurnea any legal liability or regponsibility for any third party's use or the results of such use of any information, apparatus, product or process disclosed in this report, nor represents that its use by such third party would not.infringe privately owned rights.