Review of radiation shielding concerns associated with the TMI-2 (Three Mile Island Unit 2) defueling system
The defueling system for TMI-2 was designed with maximum versatility and broad functional requirements to remove the damaged core from the reactor vessel. This was done without the ability to precisely define the operations or even the conditions of the core debris. The approach used in the design of the defueling system required planning to minimize critical path defueling time and to minimize time and worker exposure for installation and maintenance. Provisions were made to maximize pre-installed equipment assembly and checkout, to provide versatile equipment and tooling, and to achieve low maintenance on the defueling equipment and tooling. These provisions are also examples of how the as-low-as-reasonably-achievable (ALARA) principle was implemented during the design phase of the TMI-2 defueling program. During the defueling operations, it has been demonstrated that the implemented shielding requirements have provided excellent protection of operators and other workers in the reactor building. Collective exposures of the defueling operators have been maintained low, and no overexposure due to handling fuel canisters has occurred.
- Research Organization:
- Bechtel, Gaithersburg, MD (USA)
- OSTI ID:
- 5831418
- Report Number(s):
- CONF-881011-
- Journal Information:
- Trans. Am. Nucl. Soc.; (United States), Journal Name: Trans. Am. Nucl. Soc.; (United States) Vol. 57; ISSN TANSA
- Country of Publication:
- United States
- Language:
- English
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220900* -- Nuclear Reactor Technology-- Reactor Safety
ACCIDENTS
ALARA
CASKS
CONTAINERS
CORIUM
DECISION MAKING
DEMOLITION
DISCHARGE CANALS
ENRICHED URANIUM REACTORS
HYDROGEN COMPOUNDS
MECHANICAL STRUCTURES
MELTDOWN
OXYGEN COMPOUNDS
POWER REACTORS
PRESSURE VESSELS
PWR TYPE REACTORS
RADIATION PROTECTION
REACTOR ACCIDENTS
REACTOR COMPONENTS
REACTOR CORE DISRUPTION
REACTOR CORES
REACTOR DISMANTLING
REACTOR FUELING
REACTORS
REMOVAL
SHIELDING
SPENT FUEL CASKS
SUPPORTS
THERMAL REACTORS
THREE MILE ISLAND-2 REACTOR
WATER
WATER COOLED REACTORS
WATER MODERATED REACTORS