MONJU Primgry prototype pump test; In-sodium preparatory testing at emergency sodium level

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PNC TN941 84-154, 155 Pages, 1984/11

PNC-TN941-84-154.pdf:14.65MB

This report describes the operation test at emergency sodium level (up to 1230mm above impeller) of MONJU primary proto-type pump. The operation test is a preparatory test of "in-sodium test at emergency sodium level" that is performed after mounting convection suppressing rib for emergency sodium level. The following results were obtained: (1)At emergency level operation, temperature variations of outer casing circumferential direction increased, comparing at normal level operation. (2)At emergency level operation, temperature variations of inner casing circumferential direction were almostly same as that at the normal level operation, so inner casing displacement was little at emergency level operation. (3)The reaching time of maximum temperature variations and steady states from start of sodium level dropping were confirmed. (4)We evaluated the phenomena of natural convection in the vertical annulus from the test results of outer and inner casing temperature variations. (5)Measured and analyzed values of outer casing displacement were compared, analyzed values agreed approximately with measured values. Since the results as described above, we performed parameters surveying (temperature variations in cover gas region and casing dis placement) in transmission state from normal level operation to emergency level operation. We will plan "in-sodium test of emergency sodium level" that will be performed in long time operation and will confirm integrity of MONJU primary pump.