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Title: Nuclear reactor neutron shielding

A nuclear reactor includes a reactor pressure vessel and a nuclear reactor core comprising fissile material disposed in a lower portion of the reactor pressure vessel. The lower portion of the reactor pressure vessel is disposed in a reactor cavity. An annular neutron stop is located at an elevation above the uppermost elevation of the nuclear reactor core. The annular neutron stop comprises neutron absorbing material filling an annular gap between the reactor pressure vessel and the wall of the reactor cavity. The annular neutron stop may comprise an outer neutron stop ring attached to the wall of the reactor cavity, and an inner neutron stop ring attached to the reactor pressure vessel. An excore instrument guide tube penetrates through the annular neutron stop, and a neutron plug comprising neutron absorbing material is disposed in the tube at the penetration through the neutron stop.
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Issue Date:
OSTI Identifier:
BWXT mPower, Inc. IDO
Patent Number(s):
Application Number:
Contract Number:
Resource Relation:
Patent File Date: 2014 Jun 09
Research Org:
BWXT mPower, Inc., Charlotte, NC (United States)
Sponsoring Org:
Country of Publication:
United States

Other works cited in this record:

Porous Bodies of Controlled Densities and Methods of Making Them
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Nuclear Reactor Comprising A Core Cover
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Thermal insulating barrier and neutron shield providing integrated protection for a nuclear reactor vessel
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Neutron Shielding Material Composition, Shielding Material and Container
patent-application, February 2008

Nuclear Reactor Vessel Fuel Thermal Insulating Barrier
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Borated Concrete-Rubber
patent-application, October 2010

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patent-application, January 2011

Radial Neutron Reflector
patent-application, October 2013

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