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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.
Inventors:
; ;
Issue Date:
OSTI Identifier:
1389838
Assignee:
BWXT mPower, Inc. IDO
Patent Number(s):
9,761,332
Application Number:
14/299,353
Contract Number:
NE0000583
Resource Relation:
Patent File Date: 2014 Jun 09
Research Org:
BWXT mPower, Inc., Charlotte, NC (United States)
Sponsoring Org:
USDOE
Country of Publication:
United States
Language:
English
Subject:
22 GENERAL STUDIES OF NUCLEAR REACTORS

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