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Structural response of nuclear conta...

Mac Namara, Sinead Caitriona.

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Structural response of nuclear containment shield buildings with unanticipated construction openings.

Record Type:	Language materials, printed : Monograph/item
Title/Author:	Structural response of nuclear containment shield buildings with unanticipated construction openings./
Author:	Mac Namara, Sinead Caitriona.
Description:	114 p.
Notes:	Advisers: D. Billington; M. Garlock.
Contained By:	Dissertation Abstracts International68-01B.
Subject:	Engineering, Civil. -
Online resource:	http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=3247801

Structural response of nuclear containment shield buildings with unanticipated construction openings.
Mac Namara, Sinead Caitriona.

Structural response of nuclear containment shield buildings with unanticipated construction openings. - 114 p.

Advisers: D. Billington; M. Garlock.

Thesis (Ph.D.)--Princeton University, 2007.

As Nuclear Power Plants age many require steam generator replacement. There is a nickel alloy in the steam generator tubes that is susceptible to stress cracking and although these cracks can be sealed the generator becomes uneconomical without 10%-15% of the tubes. The steam generator in a typical nuclear power plant is housed in the containment structure next to the reactor. The equipment hatch is not big enough to facilitate steam generator replacement, thus construction openings in the dome of the containment structure are required.Subjects--Topical Terms:

783781
Engineering, Civil.

Structural response of nuclear containment shield buildings with unanticipated construction openings.
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008 110519s2007 ||||||||||||||||| ||eng d
035 $a (UMI)AAI3247801
035 $a AAI3247801
040 $a UMI $c UMI
100 1 $a Mac Namara, Sinead Caitriona. $3 1265802
245 1 0 $a Structural response of nuclear containment shield buildings with unanticipated construction openings.
300 $a 114 p.
500 $a Advisers: D. Billington; M. Garlock.
500 $a Source: Dissertation Abstracts International, Volume: 68-01, Section: B, page: 0475.
502 $a Thesis (Ph.D.)--Princeton University, 2007.
520 $a As Nuclear Power Plants age many require steam generator replacement. There is a nickel alloy in the steam generator tubes that is susceptible to stress cracking and although these cracks can be sealed the generator becomes uneconomical without 10%-15% of the tubes. The steam generator in a typical nuclear power plant is housed in the containment structure next to the reactor. The equipment hatch is not big enough to facilitate steam generator replacement, thus construction openings in the dome of the containment structure are required.
520 $a To date the structural consequences of construction openings in the dome have not been examined. This thesis examines the effects of such openings. The prototype concrete dome is made up of a 2 ft thick dome atop 3 ft thick and 170 ft high cylindrical walls (radius 65.5 ft) with a tension ring 15 ft high and 8 ft thick in between. The dome of the building is cast in two layers; a lower 9 inch layer that serves as the formwork for an upper 15 inch layer. The weight of the dome is carried in axial compression along the hoops and meridians of the dome.
520 $a The first finite element model uses shell elements and considers two limiting load cases; where the two layers act as one, and where the lower layer carries the weight of both. The openings interrupt the hoops and meridians and the weight of the dome must be redistributed around the openings. Without openings, the stresses due to dead load in the structure are very low when compared to the material strength. The impact of the openings is increased compression stresses near the opening. The maximum stresses are approximately four times larger than in the original structure. These results are confirmed by the second model which is made from layers of solid elements. This model shows a significant difference between the compression on the top surface of the dome, in the affected areas, and that on the bottom surface, leading to shear stresses. These shear stresses are largest around the opening but are not large enough to cause delamination.
590 $a School code: 0181.
650 4 $a Engineering, Civil. $3 783781
650 4 $a Engineering, Nuclear. $3 1043651
690 $a 0543
690 $a 0552
710 2 $a Princeton University. $3 645579
773 0 $t Dissertation Abstracts International $g 68-01B.
790 $a 0181
790 1 0 $a Billington, D., $e advisor
790 1 0 $a Garlock, M., $e advisor
791 $a Ph.D.
792 $a 2007
856 4 0 $u http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=3247801