In-Reactor Monitoring of Zircaloy-2 Plutonium Recycle Test Reactor Pressure Tubes: Part 2, May and June, 1962 Page: 2
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IN- REA C TOR MONITORING
OF ZIRCALOY-2 PRTR PRESSURE TUBES,
MAY AND JUNE, 1962
The Plutonium Recycle Test Reactor (PRTR) is a vertical high
temperature Zircaloy pressure tube reactor with the heavy water moderator
contained in an aluminum calandria tank. The heavy water primary coolant
flows upward at 123 gpm through 85 Zircaloy pressure tubes at nominal
inlet conditions of 478 F and 1090 psig and nominal outlet conditions of
530 F and about 1080 psig. Each of the Zircaloy tubes is flanged at one
end to permit attachment to the nozzle and tapered at the other end for
attachment of the cooling water inlet piping jumper. Details of the tube
dimensions are shown in Figure 1. Eighty-four of the process tubes fit
concentrically inside the Aluminum calandria shroud tubes with a nominal
0. 270-inch annulus. The central reactor tube fits inside a 6-inch OD shroud
tube installed for future special reactor tests. A typical process tube
installation is shown in Figure 2.
This use represents one of the first major elevated temperature
applications of Zircaloy-2 as a load bearing structural material. Since
prior experience with Zircaloy-2 in comparable operating environments
consists only of several years experience with single tube test loops, a
pressure tube surveillance program has been undertaken in conjunction with
PRTR operation. This surveillance program consists of in-reactor monitor-
ing' and pre- and postirradiation testing and evaluation of the Zircaloy-2
In-reactor monitoring consists of: (1) measuring the process tube
inside diameters to detect creep, (2) measuring the gas gap between the
process and aluminum calandria shroud tubes to indirectly detect bowing,
(3) visually examining the process tube with a borescope-TV combination to
detect mechanical damage or unusual localized corrosion areas, and (4)
measuring the depth of marks caused from mechanical damage or localized
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Doman, D. R. & Pankaskie, P. J. In-Reactor Monitoring of Zircaloy-2 Plutonium Recycle Test Reactor Pressure Tubes: Part 2, May and June, 1962, report, August 1962; Washington D.C.. (https://digital.library.unt.edu/ark:/67531/metadc100622/m1/4/: accessed May 23, 2019), University of North Texas Libraries, Digital Library, https://digital.library.unt.edu; crediting UNT Libraries Government Documents Department.