Nuclear component horizontal seismic restraint

Patent · 01 January 1988

OSTI ID:866629

Snyder, Glenn J ^[1]

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1. Lynchburg, VA

A nuclear component horizontal seismic restraint. Small gaps limit horizontal displacement of components during a seismic occurrence and therefore reduce dynamic loadings on the free lower end. The reactor vessel and reactor guard vessel use thicker section roll-forged rings welded between the vessel straight shell sections and the bottom hemispherical head sections. The inside of the reactor guard vessel ring forging contains local vertical dovetail slots and upper ledge pockets to mount and retain field fitted and installed blocks. As an option, the horizontal displacement of the reactor vessel core support cone can be limited by including shop fitted/installed local blocks in opposing alignment with the reactor vessel forged ring. Beams embedded in the wall of the reactor building protrude into apertures in the thermal insulation shell adjacent the reactor guard vessel ring and have motion limit blocks attached thereto to provide to a predetermined clearance between the blocks and reactor guard vessel ring.

• Research Organization: BABCOCK & WILCOX CO
• DOE Contract Number: AC06-79ET37111
• Assignee: Babcock & Wilcox Company (New Orleans, LA)
• Patent Number(s): US 4752436
• OSTI ID: 866629
• Country of Publication: United States
• Language: English

Related Subjects

/376/52/976/
adjacent
alignment
apertures
attached
attached thereto
beams
blocks
bottom
building
clearance
component
component horizontal
components
cone
contains
core
core support
displacement
dovetail
dynamic
dynamic loading
dynamic loadings
embedded
field
fitted
forged
forging
free
gaps
guard
guard vessel
head
hemispherical
horizontal
horizontal displacement
horizontal seismic
including
inside
installed
insulation
ledge
limit
limited
loadings
local
motion
mount
nuclear
nuclear component
occurrence
opposing
option
pockets
predetermined
protrude
provide
reactor
reactor building
reactor vessel
reduce
restraint
retain
rings
roll-forged
section
sections
seismic
seismic restraint
shell
shell section
shell sections
shop
slots
spherical head
straight
straight shell
support
thereto
thermal
thermal insulation
thicker
upper
vertical
vessel
vessel core
wall
welded