Secondary water condition entering the SG

In summary, the conversation revolves around the properties of feedwater entering a Pressurized Water Reactor's Steam Generator. The discussion includes information on the feedwater's subcooling and enthalpy/temperature, as well as its mass and flow rate. The importance of feedwater purity and the problem of corrosion in the 1970s is also mentioned. Additional resources and links are provided for further information on the topic.
  • #1
wulianlian
3
0
Hi, I am a student specializing in material, now i would like to stimulate secondary water of a Pressurized water reactor, could anybody tell me the water property entering the Steam Generator?

Thanks!
 
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  • #2
The feedwater is a compressed liquid and its subcooling or enthalpy/temperature depend on how much reheat (heat recovered) from the condensate of the high and low pressure turbines (through heat recovery heat exchangers).

See - Condensate-Feedwater Systems
http://www.nucleartourist.com/systems/fw.htm

Search for feedwater in this document (Components are listed by temperatures are not given):
http://www.nrc.gov/reading-rm/basic-ref/teachers/04.pdf

EPR Secondary Side Parameters - http://www.ne.doe.gov/pdffiles/eprttsuseprmechsysa.pdf
Code:
•Outlet Steam Static Pressure   1118 psia(77.1 bar)
•Secondary Design Pressure      1450 psia
•Steam Flowrate                     1407.4 lbm/s (638.4 kg/s)
•Feedwater Temperature          446ºF (230ºC)
•Overall Circulation Ratio           3.6
•Water Mass                          85.1 Tons (77.2 Metric Tons)
•Steam Mass                          6.06 Tons (5.50 Metric Tons)
•Total Mass                           91.2 Tons (82.7 Metric Tons)

For AP1000 - http://www.nrc.gov/reactors/new-reactors/design-cert/ap1000/dcd/Tier%202/Chapter%205/5-1_r15.pdf (Table 5.1-2, page 5.1-10)

Feedwater temperature, °F 440
Exit steam pressure, psia 836
Steam flow, lb/hr per steam generator 7.49x106
Total steam flow, lb/hr 14.97x106
 
Last edited:
  • #3
specializing in material

Thermodynamic properties as Astronuc said.

Cemically - purity of the water is incredible, to parts per billion.
Search on PWR Secondary Chemistry turns up plenty of articles. Corrosion was a huge problem in 1970's.
 
  • #4
Astronuc said:
...

Some great links again Astronuc. Thanks a lot!
 
  • #5
Thank you so much! That great link helps me a lot!
 

1. What is secondary water condition entering the SG?

Secondary water condition entering the SG refers to the quality of water that is being supplied to the steam generator (SG) in a nuclear power plant. This water is used to generate steam, which in turn, is used to rotate the turbines and generate electricity.

2. Why is secondary water condition entering the SG important?

The quality of water entering the SG is crucial for the proper functioning and efficiency of a nuclear power plant. Any impurities or contaminants in the water can lead to corrosion, scaling, and other issues that can affect the overall performance and safety of the plant.

3. What factors can affect the secondary water condition entering the SG?

The secondary water condition can be influenced by various factors such as the source of water, treatment processes, temperature, pressure, and flow rate. Any changes in these parameters can impact the quality of water entering the SG.

4. How is the secondary water condition entering the SG monitored and controlled?

To ensure the quality of water entering the SG, it is constantly monitored and controlled using various instruments and systems. These include chemical analysis, flow meters, pressure sensors, and control valves. Regular maintenance and testing are also conducted to ensure the proper functioning of these systems.

5. What are the consequences of poor secondary water condition entering the SG?

Poor secondary water condition can lead to various issues such as increased corrosion and scaling, reduced heat transfer efficiency, and potential equipment failures. These can not only affect the performance and safety of the nuclear power plant but also result in costly repairs and downtime.

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