Nuclear power plant end-of-life reactivity control method

A reactive control, end-of-life technology, applied in nuclear power generation, climate sustainability, greenhouse gas reduction, etc., can solve problems such as deviation of water chemistry working conditions, unreasonable design of boron removal process, increase of alkali metal ions, etc. Huge economic and social benefits, increase utilization rate and economy, reduce the effect of three waste treatment

CN104916340AActive Publication Date: 2015-09-16JIANGSU NUCLEAR POWER CORP
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Patent Information

Authority / Receiving Office
CN · China
Current Assignee / Owner
Publication Date
2015-09-16

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Abstract

The invention belongs to the nuclear power plant reactivity control field and discloses a nuclear power plant end-of-life reactivity control method. The method includes the following steps that: (1) after a set is started, primary loop ammonia addition amount is controlled; (2) when the set operates normally, ammonia is added continuously; (3) the position of a tenth group of adjustment rods is adjusted at end of life; (4) a primary loop coolant purification system is adjusted, and alkali metal in a coolant is removed; (5) a primary loop boric acid storage and processing system is put into operation, and boron is removed; and (6) the pressure of a secondary loop is decreased. With the nuclear power plant end-of-life reactivity control method of the invention adopted, the reactivity of a reactor of a nuclear power plant can be controlled safely and effectively, and fuel consumption can be increased, and pollution can be reduced.
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Description

technical field

[0001] The invention belongs to the field of reactivity control of nuclear power plants, in particular to a method for controlling reactivity of nuclear power plants at the end of their service life. Background technique

[0002] As the power consumption of the unit increases, the corresponding reactivity needs to be compensated. The first method to compensate the reactivity is to reduce the concentration of boric acid in the primary circuit coolant, and the main way to reduce the concentration of boric acid is to use filters to gradually remove boric acid and boric acid in the primary circuit. Change the water to dilute the operation. At the end of the nuclear power plant's life cycle design, when the concentration of boric acid in the primary circuit coolant is lower than 0.3g / L, the KBB (primary circuit boric acid storage and processing system) filter is put into operation to start the boron removal operation.

[0003] Due to the particularity of the desi...

Examples

Embodiment Construction

[0018] The present invention will be described in further detail below in conjunction with the accompanying drawings and embodiments.

[0019] Such as figure 1 As shown, a kind of nuclear power plant end-of-life reactivity control method provided by the present invention comprises the following steps:

[0020] (1) Add ammonia intermittently after the unit starts

[0021] After the reactor unit is started, when the ammonia concentration in the coolant increases to 20-30mg / L, the ammonia concentration in the primary loop coolant is controlled by reducing the amount of ammonia added, and gradually reaches a dynamic balance with the consumption and input of ammonia. Ensure that the control target of ammonia concentration is 15mg / L. After optimization, the chloride ion concentration in the purification system and coolant is significantly reduced, only 1 / 10 of the original value, and the purification system works stably.

[0022] (2) Continuous ammonia addition during normal opera...