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ORNL-2106 - the Molten Salt Energy Technologies Web Site

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(d<br />

. terminated after 1217 and 1339 hr of <strong>the</strong> 1500 hr<br />

schedu fed because of. excessive oxidation and<br />

resultant leaks in <strong>the</strong> heated<br />

The remaining loop, 880, compl<br />

* 1OOQ' hr of operation. Meta<br />

of <strong>the</strong>se loops have not been completed,<br />

c<br />

SPECIAL FLUORIDE FUEL MIXTURES IN<br />

INCONEL THERMAL-CONVECTION LOOPS<br />

J. H. DeVan<br />

Additional lnconel <strong>the</strong>rmal-convection loops<br />

have been operated to evaluate corrosion properties<br />

PERIOD ENDING JUNE 10, l956<br />

of several special fluoride fuel mixtures. Tests<br />

of 500 hr duration were completed for mixtures in<br />

<strong>the</strong> MF-ZrF,-UF, system, where MF is KF, LiF,<br />

NaF, or RbF. Mixtures with each of <strong>the</strong>se fluorides<br />

and 40 or 46 mole % ZrF, have been tested; each<br />

mixture contained 4 mole % UF,. The results<br />

obtained for <strong>the</strong> fuels sontaining 46 mole % ZrF,<br />

were reported previously,3 but <strong>the</strong>y are repeated in<br />

Table 3.1.6 for comparison. Lowering <strong>the</strong> ZrF,<br />

content, as shown in Table 3.1.6, had no effect on<br />

attack by <strong>the</strong> NaF-containing mixture, but <strong>the</strong><br />

attack by <strong>the</strong> KF- and RbF-containing mixtures<br />

increased from 1 to 2 mils. The LiF-containing<br />

TABLE 3.1.6. RESULTS OF METALLOGRAPHIC EXAMINATIONS OF INCONEL THERMAL-CONVECTION<br />

LOOPS OPERATED WITH SPECIAL FLUORIDE FUEL MIXTURES<br />

AT A HOT-LEG TEMPERATURE OF lSOO°F<br />

Loop Fuel Mixture Fuel Mixture Composition<br />

Operating<br />

Time<br />

Metal lograph ic Results<br />

Maximum Hat-Leg<br />

No. Code Designation (mole X) Attack Cold-Leg Deposits<br />

(hr)<br />

(mils)<br />

845 94 KF-ZrF4-UF4; 50-46-4 500<br />

846 94 K F*Zr F4-U F4; 50-46-4 500<br />

883 94 K F-ZrF4-U F4; 50-46-4 1500<br />

884 94 K F-Zr F4-U F4; 50-46-4 1500 '<br />

930 WR4 K F-Zr F4-U Fa; 54-40-4 500<br />

931 WR4 KF-ZrF4-UF4; 56-40-4 500<br />

847 93 L i F-Zr F4-UF4; 50-46-4 500<br />

93 LiF*ZrF4-UF4; 50-46-4 500<br />

WR3<br />

WR3<br />

95<br />

95 R bF-Zr F4-UF4; 50-46-4<br />

WRS<br />

WR5<br />

30 NaF-ZrF4=UF4; 50-46-4<br />

30 NaF-ZrF4-UF4; 50-46-4<br />

WR2<br />

WR2<br />

6.5 Metallic layer<br />

8 Metallic layer<br />

11 ktallic layer<br />

9 Metallic layer<br />

7<br />

Metallic layer<br />

9 Metallic layer<br />

17.5 Possible crystals<br />

19 Possible crystals<br />

10 Metallic layer and crystals<br />

10 Metallic layer and crystals<br />

9<br />

9<br />

Me ta I I ic layer<br />

10 Metallic layer and crystals<br />

11<br />

10.5<br />

9<br />

10<br />

7<br />

,139

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