Abstract
In the nuclear power station, the expansion joint of moisture separator re-heater (MSR for short) was founded locally folding deformation under the outage condition. Folding deformation increasing will lead expansion joint leak, it would cause emergency stop when leaking seriously. To solve these problems, this paper analysis mainly on three aspects: the material organization performance, the expansion joint installation and the stress characteristic of expansion joint. Both the verticality deviation in the process of installation and the material hardness value exceed standard are the root cause of these problems. At the end of the paper, the improvements have been put forward for this problem.
Highlights
The moisture separator re-heater (MSR for short) is set up between high pressure cylinder and low pressure cylinder in the Pressurized Water Reactor (PWR for short) nuclear power station
The new saturated steam go through two levels of re-heater, making the exhaust steam of high pressure cylinder become superheated steam after working and before entering the medium and low pressure cylinder
1) The metallography analysis of the MSR expansion joint shows that the expansion joint is made of 304L stainless steel, C element content of the expansion joint is beyond the specified value in the ASTM A240[7]
Summary
The moisture separator re-heater (MSR for short) is set up between high pressure cylinder and low pressure cylinder in the Pressurized Water Reactor (PWR for short) nuclear power station. Its role is to separate new saturated steam from high pressure cylinder whose humidity is increasing after working. The new saturated steam go through two levels of re-heater, making the exhaust steam of high pressure cylinder become superheated steam after working and before entering the medium and low pressure cylinder. The hydrophobic pipeline should be through the MSR shell, when the plant is running, the pipe material expanding or the stress appearing causes the horizontal displacement increases and the expansion amount of shell not synchronized. Set the expansion joints at the connection of drain pipe and shell to compensate thermal expanding displacement in every direction [2]
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