Shutdown & Startup Procedure for HRR
- Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)
This report presents a preliminary proposal for startup and shutdown of the HRR. The principal objective has been to develop a procedure for quick startup which represents a definite improvement over pure D2O startup. Elimination of a full thermal cycle on the system during each shutdown has also been considered important. The procedure suggested stays within the limitations of available pulsafeeder type pumps. As a quick startup procedure for the HRR, it is proposed that during each routine shutdown sufficient fuel solution be retained in the high pressure system to keep the system above a minimum specified temperature during the shutdown period. Radiolytic gases generated can be removed by a continuous steam vent. Decay heat in excess of requirements for heat losses and venting can be removed by generating steam in one of the main heat exchangers at a low controlled pressure. At time of reactor startup, the high pressure system is filled with heavy water that has been preheated to the system equilibrium temperature. The reactor is made critical at this temperature by pumping in concentrated fuel solution. An equilibrium temperature of 374°F is selected. About 70 minutes is required to reach an average operating temperature of 482°F.
- Research Organization:
- Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)
- Sponsoring Organization:
- USDOE National Nuclear Security Administration (NNSA), Nuclear Criticality Safety Program (NCSP); US Atomic Energy Commission (AEC)
- DOE Contract Number:
- W-7405-ENG-26
- NSA Number:
- NSA-11-009807
- OSTI ID:
- 4346927
- Report Number(s):
- CF-56-7-107
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
21 SPECIFIC NUCLEAR REACTORS AND ASSOCIATED PLANTS
42 ENGINEERING
CRITICALITY
Criticality
FLUID FLOW
FUEL SOLUTIONS
Fuel Solutions
HEAVY WATER MODERATOR
HIGH TEMPERATURE
HOMOGENEOUS REACTORS
HRR
Heavy Water Moderator
Homogeneous Reactor
Nuclear Criticality Safety Program (NCSP)
PRESSURE
Pressure
Proposal
Pulsafeeder
RESEARCH REACTORS
SHUTDOWN
STARTUP
Startup
THERMAL STRESSES
42 ENGINEERING
CRITICALITY
Criticality
FLUID FLOW
FUEL SOLUTIONS
Fuel Solutions
HEAVY WATER MODERATOR
HIGH TEMPERATURE
HOMOGENEOUS REACTORS
HRR
Heavy Water Moderator
Homogeneous Reactor
Nuclear Criticality Safety Program (NCSP)
PRESSURE
Pressure
Proposal
Pulsafeeder
RESEARCH REACTORS
SHUTDOWN
STARTUP
Startup
THERMAL STRESSES