Analysis and Solution of Overpressure Issue of Main Steam Isolation Valve of Expansion Project

Mou Yang; Dong Juncheng; Lu Qi

Volume 35 Issue S1

Feb. 2025

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Mou Yang, Dong Juncheng, Lu Qi. Analysis and Solution of Overpressure Issue of Main Steam Isolation Valve of Expansion Project[J]. Nuclear Power Engineering, 2014, 35(S1): 103-106.

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Mou Yang, Dong Juncheng, Lu Qi. Analysis and Solution of Overpressure Issue of Main Steam Isolation Valve of Expansion Project[J]. Nuclear Power Engineering, 2014, 35(S1): 103-106.

Mou Yang, Dong Juncheng, Lu Qi. Analysis and Solution of Overpressure Issue of Main Steam Isolation Valve of Expansion Project[J]. Nuclear Power Engineering, 2014, 35(S1): 103-106.

Citation:

Mou Yang, Dong Juncheng, Lu Qi. Analysis and Solution of Overpressure Issue of Main Steam Isolation Valve of Expansion Project[J]. Nuclear Power Engineering, 2014, 35(S1): 103-106.

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Analysis and Solution of Overpressure Issue of Main Steam Isolation Valve of Expansion Project

CNNC Nuclear Power Operations Management Co., Ltd, Haiyan, Zhejiang, 314300, China

Received Date: 2013-11-15
Rev Recd Date: 2014-01-19

Available Online: 2025-02-15

Abstract

Abstract

The overpressure problem frequently occurred in the commissioning and operation of main steam isolation valve（MSIV） actuator of Qinshan Phase II expansion project.The analysis of the change of the nitrogen with the temperature found that the fundamental cause of the problem is as follows:there is no temperature compensation space for the accumulator plunger,and the hydraulic oil expanded with the change of temperature,and there is no space for accumulator to expand.A temporary scheme for overpressure problem is proposed,and a pressure relief device is designed and applied in real situation.The overpressure problem of MSIV actuator is solved successfully.
- Main Steam Isolation Valve,
- Actuator,
- Hydraulic pressure system,
- Overpressure

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