Study on Prediction and Diagnosis of Fuel Rod Break Size during Degassing Operation of PWR

Ye Yaoxin; Fu Pengtao

doi:10.13832/j.jnpe.2024.06.0220

Volume 45 Issue 6

Dec. 2024

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Ye Yaoxin, Fu Pengtao. Study on Prediction and Diagnosis of Fuel Rod Break Size during Degassing Operation of PWR[J]. Nuclear Power Engineering, 2024, 45(6): 220-225. doi: 10.13832/j.jnpe.2024.06.0220

Citation:

Ye Yaoxin, Fu Pengtao. Study on Prediction and Diagnosis of Fuel Rod Break Size during Degassing Operation of PWR[J]. Nuclear Power Engineering, 2024, 45(6): 220-225. doi: 10.13832/j.jnpe.2024.06.0220

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Study on Prediction and Diagnosis of Fuel Rod Break Size during Degassing Operation of PWR

doi: 10.13832/j.jnpe.2024.06.0220

China Nuclear Power Technology Research Institute Co., Ltd., Shenzhen, Guangdong, 518028, China

Received Date: 2024-01-09
Rev Recd Date: 2024-03-15
Publish Date: 2024-12-17

Abstract

Abstract

The operation data of PWR nuclear power plant show that after the unit implements large flow degassing operation, the specific activity of fission products of primary coolant oscillates violently in a short time, which makes the fuel damage prediction method based on the average core state fission release-to-birth ratio (R/B) have prediction bias. Based on the parameters of degassing system and the mechanism of inert gas release in PWR nuclear power plant, this paper establishes a modified prediction and analysis model of inert gas release in degassing operation, gives the calculation method of degassing factor and inert gas release rate under degassing conditions, and optimizes the traditional prediction method of fuel rod break size based on R/B. The modified prediction method of degassing operation has been applied and verified in a PWR nuclear power plant. The maximum relative deviation of specific activities of six common inert gas nuclides predicted is 33.4%, and the others are less than 20%. The predicted fuel rod break size is large, which is consistent with the inspection results after shutdown.
- Fuel rod failure,
- Degassing operation,
- Fission product activity,
- PWR

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References(13)

References

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