DE1065949B - - Google Patents

Description

OM Zszrti **

FEDERAL REPUBLIC OF GERMANY

German MmdL · Patent Office

KLr21g 21/3

internat. kl.

1/31 ο

FROM LE GE SCH RI FT 1065 949

S 58155 VIII c / 21g

Registration date: MAY 8, 1958

Notice
the registration
and output of the

Publication: SEPTEMBER 24, 1959

The invention relates to an atomic nuclear reactor, the moderator of which at least in part There is heavy water diluted with light water and its reactivity when the heavy water concentration increases of the moderator increases.

In a reactor of this type there was, especially when the coarse regulation of the reactor happened with the help of a change in the heavy water concentration and to carry this out Regejun ^ a ^^ rße.r.er .. stock of heavy water had to be kept ready at the reactor, the risk that z. B. as a result of an operating error, a heavy water ingress into the moderator occur could, the reactivity then suddenly increased unacceptably and the reactor ran away.

In order to eliminate such disadvantages, it is proposed according to the invention that a concentrating device heated by moderator heat be provided. Seeing which the heavy water concentration of the moderator progressively increases so that thereby at least the loss of reactivity caused by the progressive burn-off of the reactor fissile material can be compensated.

There is then no need to keep a heavy water supply ready at the reactor, and thus also the possibility and danger of a sudden increase in the heavy water concentration of the moderator. The heavy water concentration can then only increase steadily and very slowly.

In addition to the concentrating device which increases the reactivity, a dilution device can also be used be provided, which by adding light water, the heavy water concentration of the moderator and with it to reduce the reactivity of the reactor and thus in connection with the mentioned, only slowly acting concentrating device allows the reactivity to be adjusted safely.

A rectifying device can serve as the concentrating device.

Further features of the invention are based on the drawing of a schematically illustrated embodiment explained.

A moderator is fed to the atomic nuclear reactor 1 by means of the circulation pump 2 through the pipeline 3, which consists of heavy water diluted with light water. The moderator leaves, in reactor 1 heated, the same through the pipe 4> -which leads it to the bubble heater 5 of the rectifying column 6, and then completed, cooled in the bubble heater S, through the line leading back to the circulation pump 2 7 its circulation. A small portion of the moderator circulating in this way is taken from the line4 constantly branched off by means of the adjustable valve 8,

Nuclear reactor

Applicant:
Sulzer Brothers Aktiengesellschaft, Winterthur (Switzerland)

Representative: Dipl.-Ing. Η. Marsch, patent attorney, Schwelm (Westphalia), Drosselstr. 31

Claimed priority: Sdiweiz vrim 5 May 195 »

15th

relaxed to the lower pressure prevailing in the column 6 and in its bladder 9 and evaporated under the action of the relaxation and the heating in part up into the column 6, from which predominantly the less volatile component,

that is, the heavy water D ₂ O drips back into the bubble 9, while parts of the more volatile component, that is the light water H ₂ O, are removed from the column 6 upwards through the line 10. This increases the difficulty

water concentration in the bladder gradually. The, as mentioned, by means of the valve 8 constantly ^ out of the line 4 branched off and the bladder 9 supplied moderator portion is by means of the pump 11 and him the Line 7 branching line 12 constantly from the

Bubble replaced out again, so that also in the moderator circulation leading through the reactor 1 the heavy water concentration increases slowly over time.

The speed of this increase can be adjusted with the help of the aforementioned. Control valve 8, in particular so that the otherwise progressive loss of reactivity as a result of the burn-up of the reactor fissile material of the reactor is compensated.

And on the contrary, the reactivity can also be reduced at any time by adding light water to the moderator, e.g. B. by adding to the contents of the bladder 9 or in exchange for a small part of the moderator circulating in parts 2, 3, 1, 4, 5, 7, 2.

Claims (3)

Patent claims: 1. Atomic nuclear reactor, the moderator of which is at least partly made up of diluted with light water There is heavy water and its reactivity 909 629/242 Increase in the heavy water concentration of the moderator increases, characterized in that _v a heated by moderator heat concentrating device is provided, which the heavy water concentration of the moderator. . progressively increased in such a way that the loss of reactivity caused by the progressive burn-off of the reactor fissile material can at least be compensated for. 2. Atomic nuclear reactor according to claim 1, characterized in that in addition to the reactivity he increasing concentrating device, a dilution device is provided, which by Addition of light water the heavy water concentration of the moderator and with it the Reactivity of the reactor also to reduce and thus in connection with the mentioned, only slowly acting concentrating device allowed to adjust the reactivity safely. 3. Atomic nuclear reactor according to claim 1, characterized in that as a concentrating device a rectifying column is used. 1 sheet of drawings O 909 629/242 9.59