Postirradiation examination of Peach Bottom HTGR Driver Fuel Element E06-01

Dyer, F.F.; Wichner, R.P.; Martin, W.R.; Fairchild, L.L.; Kedl, R.J.; Nordwall, H.J. de

doi:10.2172/7284510

Cited by 5 publications

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“…No other documents were located that indicate there might be less than 30 compacts in an element. Section 1.2 of ORNL-5126 8 , regarding element E06-01, states that portions of the drawings supplied by GA were redrawn. These drawings are clearer than most of the original drawings that have been located and are included in Section 3.3, Figures 12 through 17 under Core 2 information.…”

Section: Core 1 Standard Fuel Elementmentioning

confidence: 99%

Fuel Summary for Peach Bottom Unit 1 High-Temperature Gas-Cooled Reactor Cores 1 and 2

Kingrey¹

2003

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Section: Core 1 Standard Fuel Elementmentioning

confidence: 99%

Fuel Summary for Peach Bottom Unit 1 High-Temperature Gas-Cooled Reactor Cores 1 and 2

Kingrey¹

2003

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“…X-Is and yci _ h , 9 s "T* Nl " 3.7 x 10* ' (2) The summation was taken from group 15 through group 10, which accounts for about 98% of the production. The initial concentration of C, N X 3, was calculated from an isotopic abundance of 1.1% and a graphite density of 1.8 g/cm 3 .…”

Section: Inventory In the Removable Radial Reflectormentioning

confidence: 99%

Carbon-14 production in the Peach Bottom HTGR core

Wichner¹,

Dyer²

1980

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Carbon-14 concentrations were measured in a variety of core components during the Peach Bottom Surveillance Program. Five fuel element sleeves and spines were dissected to obtain radial concentration profiles at four axial locations. The profiles show that the major part of the 1 '*C in these graphite components characteristically showed a flat radial distribution across the interior of the member; the balance was found in concentration peaks at each exposed surface. The source of these surface peaks is not fully understood. Concentrations were also determined in five fuel element fission product traps, one removable radial reflector block, and 12 fuel particle pairs taken from a number of axial locations in one fuel element. Estimates of whole-core inventory were made from these concentration determinations. Most surprising was the comparatively high ik C inventory associated with fuel particles, which must be ascribed to nitrogen contamination of the fuel. Also unexpectedly high was the level found in the fuel element charcoal traps, which despite their small mass contained almost as much 1 '*C as all the graphite sleeves and spines. On a per unit energy basis, an estimated 113 Ci/ GW(t)-yr of lk C was produced in the Peach Bottom HTGR, which is about 30% higher than predictions based on the ORIGEN computer code. The difference seems due mainly to the assumed level of nitrogen contamination in the fuel.

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“…The spine of element ElU-01 additionally contained two thermocouples, identically as shown for element EOS-01 in ref. 5-The thermocouples were positioned in rectangular grooves cut in two of the three spine pieces. Table 2.1-1.…”

Section: Design Dimensions and Specificationsmentioning

confidence: 99%

Distribution of fission products in Peach Bottom HTGR fuel element E14-01

Wichner¹,

Dyer²,

Martin³

et al. 1977

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This is the third in a projected series of six postirradiation examinations of Peach Bottom High-Temperature Gas-Cooled Reactor driver fuel elements. Element ElU-01, the subject of this report, was one of the 60 driver elements (out of a total of 80U) that contained zirconium boride pellets within a hollow spine. It was also one of the few predimensioned elements, which therefore allowed accurate determination of dimensional change due to irradiation service. The element received an equivalent of 897 full-power days irradiation prior to scheduled termination of Core 2 operation. The examination procedures emphasized the determination of fission product distributions in the graphite portions of the fuel element. Continuous axial scans indicated a 137 Cs inventory of 0.21+ Ci in the graphite sleeve and 0.0V7 Ci in the spine at the time of element withdrawal from the core. In addition, the nuclides 134 Cs, 110m Ag, 6o Co, and 154 Eu were found in the graphite portions of the fuel element in significant amounts. Radial distributions of these nuclides plus the beta-emitters 3 H, 14 C, and °Sr were obtained at three axial locations within the fueled region of the element. The radial dissection was accomplished by use of a manipulator-operated lathe in a hot cell. In addition to fission product distributions, the appearance of the component parts of the element was recorded photographically, fuel compact and graphite dimensions were recorded at numerous locations, and metallographic examinations of the fuel were performed.

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Postirradiation examination of Peach Bottom HTGR Driver Fuel Element E06-01

Cited by 5 publications

References 0 publications

Fuel Summary for Peach Bottom Unit 1 High-Temperature Gas-Cooled Reactor Cores 1 and 2

Fuel Summary for Peach Bottom Unit 1 High-Temperature Gas-Cooled Reactor Cores 1 and 2

Carbon-14 production in the Peach Bottom HTGR core

Distribution of fission products in Peach Bottom HTGR fuel element E14-01

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