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ORNL-2106 - the Molten Salt Energy Technologies Web Site

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PERIOD ENDING JUNE 10, 1956<br />

Fig. 1.5.4. Concrete Penthouse Adjacent to Reactor Cell. Photograph taken May 4, 1956.<br />

for assembling o<strong>the</strong>r parts of <strong>the</strong> reactor. Of par-<br />

ticular concern in <strong>the</strong>se studies are <strong>the</strong> problems<br />

caused by weld shrinkage during assembly. Recent<br />

data obtained from test weldments (see Chap. 3.4,<br />

#I Welding and Brazing Investigations”) have shown<br />

<strong>the</strong> need to modify some assembly techniques<br />

originally considered for <strong>the</strong> reactor in order to<br />

control <strong>the</strong> dimensions of <strong>the</strong> final assembly.<br />

Stress problems which will occur in handling com-<br />

ponents during assembly have also imposed re-<br />

strictions on assembly methods and are now being<br />

evaluated with respect to <strong>the</strong>ir effect on <strong>the</strong> tech-<br />

niques.<br />

Virtually ull of <strong>the</strong> long-delivery materials for<br />

<strong>the</strong> reactor assemblies have been ordered, but<br />

actual fabrication of most items has been delayed<br />

by lack of firm drawings.<br />

A review of <strong>the</strong> design indicated <strong>the</strong> need for<br />

flow tests on <strong>the</strong> reflector-moderator and island<br />

assemblies, While <strong>the</strong> extent of this test program<br />

has not been clearly defined, it is expected to<br />

cause a significant delay in <strong>the</strong> completion of<br />

<strong>the</strong> reactor assembly.<br />

As stated above, construction of <strong>the</strong> ART is<br />

being accelerated with respect to construction of<br />

<strong>the</strong> ETU. A calculated risk is being taken that<br />

<strong>the</strong> ETU will not show a need for correction of<br />

<strong>the</strong> ART reactor, and thus <strong>the</strong> ART reactor will<br />

be assembled as soon as possible after <strong>the</strong> ETU<br />

assembly is completed. Parts for a third reactor<br />

are being procured as insurance against excessive<br />

time loss if <strong>the</strong> risk fails.<br />

Fabrication of <strong>the</strong> north head of <strong>the</strong> ETU has<br />

been started. Some delay has occurred because of<br />

redesign, and welding progress appears to be<br />

slower than anticipated. Delays in <strong>the</strong> receipt<br />

of <strong>the</strong> sodium-to-NaK heat exchanger and some<br />

forged parts may hold up work on this item. All<br />

73

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