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Flow distribution structure of reactor of nuclear power station

A nuclear power plant reactor and flow distribution technology, which is applied in the field of nuclear power, can solve the problems of complex structure, large number of connecting bolts, and high cost, and achieve the effects of avoiding vortex shedding, good flow distribution uniformity, and improving flow field characteristics

Active Publication Date: 2012-11-28
中广核工程有限公司 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the number of connecting bolts in the above-mentioned flow distribution structure 30 is too many, and the structure is relatively complicated; the holes on the mesh orifice plate 302 are square, and the orifice structure is processed by forging, and the cost is also high; and the flow distribution effect of this structure But it is not good, the coefficient of non-uniformity is about 20%

Method used

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  • Flow distribution structure of reactor of nuclear power station
  • Flow distribution structure of reactor of nuclear power station
  • Flow distribution structure of reactor of nuclear power station

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Embodiment Construction

[0025] see Figure 5 and Figure 6 , The flow distribution structure of the nuclear power plant reactor of the present invention includes a support plate 50 under the core and a head-shaped structure.

[0026] The lower support plate 50 of the core is welded to the lower end of the hanging basket 80, and has a perforation 52 corresponding to the position of each fuel assembly.

[0027] The head-shaped structure includes a head 60 and a flange 62 . Among them, the head 60 is hemispherical, with a thickness of 20-150 mm, and a large number of flow holes 600 with a diameter of 20-200 mm are evenly opened on it. These flow holes 600 include vertical flow holes 602, horizontal flow holes 604 and oblique flow holes. Hole 606. The flange 62 is arranged on the edge of the head 60, and several screw holes 620 are opened on it, and the bolts 64 pass through the screw holes 620 on the flange 62 to fix the head-shaped structure on the edge of the lower surface of the core lower support...

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Abstract

The invention discloses a flow distribution structure of a reactor of a nuclear power station. The flow distribution structure is used for distributing the flow of coolant of a cooled reactor core and comprises a reactor core lower supporting plate and an end-socket-shaped structure fixed on the reactor core lower supporting plate; and the end-socket-shaped structure comprises an end socket with drain holes. Compared with the prior art, the flow distribution structure of the reactor of the nuclear power station has the advantages that the shape of a coolant channel is changed through the end socket, so that characteristics of a flow field of a lower cavity are improved effectively, vertex shedding of reactor internals in the lower cavity is avoided, the flow of the coolant is distributed through the drain holes of the end socket, and uniformity of flow distribution of fuel assemblies entering the reactor core is perfect.

Description

technical field [0001] The invention relates to the technical field of nuclear power, and more specifically, the invention relates to a reactor flow distribution structure of a nuclear power plant. Background technique [0002] see figure 1 , the pressurized water reactor body of a nuclear power plant is composed of reactor pressure vessel 10, reactor internals, control rod drive mechanism, core components, and core instrumentation. 12 provide a reasonable runner. The coolant flows in from the inlet nozzle 100 of the reactor pressure vessel 10 , enters the annular descending chamber 102 , then enters the lower chamber 104 , and enters the core 12 after passing through the lower support plate 106 of the core, thereby realizing the cooling of the core 12 . However, since the lower head 108 of the pressure vessel 10 is generally spherical or disc-shaped, the lower chamber 104 surrounded by it and the core lower support plate 106 is approximately hemispherical. When the coolan...

Claims

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Application Information

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IPC IPC(8): G21C3/322G21C7/32
CPCY02E30/38Y02E30/39Y02E30/30
Inventor 段远刚方健冉小兵吕品张明乾杨春乐刘勇
Owner 中广核工程有限公司
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