Shielding device

Patent · Tue Oct 13 04:00:00 EDT 1987

OSTI ID:5778394

Brahm, L D; Brown, F C; Ciarlone, D F; Dedrich, M R; Hassall, J B; Salva, F M

In a boiling water nuclear reactor having an under-vessel area with control rod drives, each control rod drive having a flange assembly comprising a control rod drive housing flange and a mating control rod drive flange joined together by bolting means. A shielding device is described comprising: shielding members wherein (a) each shielding member is comprised of: (i) a cylindrical outer wall of a non-corrosive metallic substance, (ii) an annular outer bottom wall of a non-corrosive metallic substance, (iii) a first cylindrical inner wall of a non-corrosive metallic substance, (iv) an annular inner bottom wall of a non-corrosive metallic substance fixedly attached to the first inner wall, (v) an annular upper interior wall of a non-corrosive metallic substance fixedly attached to the interior surface of the outer wall and the upper perifery of the first inner wall, (vi) a second cylindrical inner wall of a non-corrosive metallic substance fixedly attached to the interior perifery of the outer bottom wall and the inner bottom wall, (vii) two radial walls of a non-corrosive metallic substance, (viii) an amount of shielding material disposed within the partial cylindrical chamber; (b) each shielding member is provided with attachment means comprising: (i) a first contact point; (ii) a second contact point; and (c) each shielding member has a suitable geometry such that, when the shielding members are assembled in mating continuous engagement, they surround and enclose the lower terminus of the control rod drive with an effective amount of shielding material.

• Assignee: NOV; NOV-88-086501; EDB-88-008913
• Patent Number(s): US 4699752
• OSTI ID: 5778394
• Country of Publication: United States
• Language: English

Related Subjects

21 SPECIFIC NUCLEAR REACTORS AND ASSOCIATED PLANTS
210100 -- Power Reactors
Nonbreeding
Light-Water Moderated
Boiling Water Cooled
22 GENERAL STUDIES OF NUCLEAR REACTORS
220900* -- Nuclear Reactor Technology-- Reactor Safety
ALLOYS
BOLTED JOINTS
BWR TYPE REACTORS
CONTAINERS
CONTROL ROD DRIVES
CORROSION PROTECTION
CORROSION RESISTANT ALLOYS
DESIGN
FLANGES
JOINTS
RADIATION PROTECTION
REACTOR COMPONENTS
REACTOR SAFETY
REACTOR VESSELS
REACTORS
SAFETY
SHIELDS
WATER COOLED REACTORS
WATER MODERATED REACTORS