Pulsed high-pressure (PHP) drain-down of steam generating system

Details Pulsed high-pressure (PHP) drain-down of steam generating system Pulsed high-pressure (PHP) drain-down of steam generating system

1989-10-02

1991-03-19

Wasil, Daniel D.

Induced nuclear reactions: processes, systems, and elements

Fission reactor material treatment

Impurity removal

G21C 1900, F28G 900

Patent

active

050009087

ABSTRACT:
The present invention relates to intermittently introducing, under carefully controlled conditions, an inert gas, into at least the channel head primary coolant water outlet side of steam generators during the drain-down of a nuclear-powered steam generating system. Predetermined quantities of such gas are introduced into open ends of the inverted U-tubes which terminate at the tubesheet in the channel heads to thereby alleviate the propensity for formation of vacuum pockets at the tops thereof, and at the same time to provide that water columns defined severely near their tops by the water within each such tube and collectively near their bottoms by the water extending downward through the steam generator channel head, are not disrupted by the inadvertent formation of a gas/water interface formed in the general vicinity of the tubesheet and resulting from the flooding of the underside thereof with said gas. There exists a dependent and inversely proportional relationship between the pressure of gas introduction and the ratio of pulse time-on to pulse time-off in the instant gas introduction procedure, to thereby effect an optimum ratio of about 1.1 between the volume of nitrogen introduced into and the volume of water removed from such inverted U-tubes.

REFERENCES:
patent: 3825060 (1974-07-01), Heller et al.
patent: 4261300 (1981-04-01), Cross et al.
patent: 4649019 (1987-03-01), Jawor

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