Transient bowing of core assemblies in advanced liquid-metal fast reactors

Conference · Tue Dec 31 23:00:00 EST 1985 · Trans. Am. Nucl. Soc.; (United States)

OSTI ID:6570052

Kamal, S A; Orechwa, Y

One of the objectives of advanced liquid-metal reactors (LMRs) is to maximize the inherent safety features of these reactors. At issue are the core reactivity feedbacks, which require detailed analysis and evaluation so as to assure a net negative reactivity insertion during transient events. The bowing of core assemblies is one of the critical core design elements with respect to its effect on the net reactivity during a transient such as a loss of flow (LOF). In the present paper, two alternative core restraint systems for a conceptual design of an LMR are compared based on their bowing reactivity effect during an LOF transient. The first system includes a restraint ring at the level of the top load pads (TLPs) to control the radial displacements of the outer-most row of the assemblies. This system is called a limited-free-bowing restraint system. The second system does not include a restraint ring and thus allows the assemblies to freely flower outward during an LOF transient. This system is called a free-flowering restraint system. Except for the restraint ring difference, the two systems are very similar. The systems provide two supports for the assemblies at the lower grid plates and permit interaction between assemblies at the above core load pads (ACLPs) and the TLPs.

• Research Organization: Argonne National Lab., IL
• OSTI ID: 6570052
• Report Number(s): CONF-860610-
• Journal Information: Trans. Am. Nucl. Soc.; (United States), Journal Name: Trans. Am. Nucl. Soc.; (United States) Vol. 52; ISSN TANSA
• Country of Publication: United States
• Language: English

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ACCIDENTS
COMPUTERIZED SIMULATION
CREEP
DEFORMATION
FUEL ASSEMBLIES
LIQUID METAL COOLED REACTORS
LOSS OF FLOW
MECHANICAL PROPERTIES
PHYSICAL RADIATION EFFECTS
RADIATION EFFECTS
REACTIVITY
REACTIVITY INSERTIONS
REACTOR ACCIDENTS
REACTOR COMPONENTS
REACTOR CORES
REACTOR SAFETY
REACTORS
SAFETY
SIMULATION
TRANSIENTS