Passive waste heat removal system for secondary side of marine reactor and once-through steam generator

Abstract

The invention relates to a marine reactor and once-through steam generator secondary side passive residual heat removal system, comprising: an once-through steam generator arranged in a containment and provided with a first inlet and a first outlet; a water supplement box that stores a coolant and is arranged outside the containment, wherein the water supplement box is provided with a second outlet and a second inlet, and the second outlet is positioned below the liquid level in the water supplement box; an incoming pipe connected between the first inlet and the second outlet; an outgoing pipeconnected between the first outlet and the second inlet. The liquid level in the water supplement box is higher than the first inlet, the coolant in the water supplement box is allowed to flow into the once-through steam generator via the second outlet and the first inlet, the once-through steam generator adsorbs atomized steam that flows out of the first outlet, condensate flows into the water supplement box via the second inlet. The system of the invention employs the passive residual heat removal technique, and the removal of residual waste when the reactor loses a normal heat removal pathis ensured; the water supplement box is communicated with the once-through steam generator, so that automatic water supplementing is achieved.

Description

technical field [0001] The invention relates to a dedicated safety system for a marine reactor, and more specifically, relates to a secondary side passive waste heat discharge system for a marine reactor and a once-through steam generator. Background technique [0002] The main purpose of the marine reactor safety system is to ensure the emergency shutdown of the reactor, the discharge of residual heat from the core and the integrity of the containment vessel after the accident, so as to limit the development of the accident and reduce the consequences of the accident. Among them, the issue of reactor waste heat removal is particularly important under accident conditions. It is directly related to the safety of the reactor. If it is not handled properly, it will cause the primary circuit coolant to boil or even melt the core. Therefore, the design of the emergency waste heat removal system of the reactor has always been the key to the design of the reactor. One of the techni...

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Problems solved by technology

[0007] 1. The passive waste heat removal system on the primary side occupies the available space of the containment because the cooling water tank is installed in the containment, which is not conducive to the reduction of the size of the containment;

[0008] 2. Since the passive heat exchanger in the refueling water tank inside the containment is the primary circuit working fluid, once the heat transfer tube bundle is cracked or damaged, the radioactive products of the primary circuit working fluid will enter the refueling water tank and the atmosphere of the containment. Facilitate the containment of radioactivity

[0011] 1. The space on the secondary side of the DC steam generator is limited. Under accident conditions, it is easy to cause water shortage or even dry out on the secondary side. It needs to be supplemented with water to establish a natural circulation, and the supplementary water at a lower temperature will affect the DC steam generator. cause thermal shock;

[0012] 2. Under the accident state, the amount of water stored in the secondary side of the DC steam generator is uncertain, which makes it difficult to determine the water replenishment. Directly affect the generation of steam and the discharge of waste heat

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