A More Widely Applicable Calculation Method for Coastdown of Reactor Coolant Pump

Zhong Yun; Zhou Wenxia

doi:10.13832/j.jnpe.2023.06.0231

Volume 44 Issue 6

Dec. 2023

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Zhong Yun, Zhou Wenxia. A More Widely Applicable Calculation Method for Coastdown of Reactor Coolant Pump[J]. Nuclear Power Engineering, 2023, 44(6): 231-236. doi: 10.13832/j.jnpe.2023.06.0231

Citation:

Zhong Yun, Zhou Wenxia. A More Widely Applicable Calculation Method for Coastdown of Reactor Coolant Pump[J]. Nuclear Power Engineering, 2023, 44(6): 231-236. doi: 10.13832/j.jnpe.2023.06.0231

Zhong Yun, Zhou Wenxia. A More Widely Applicable Calculation Method for Coastdown of Reactor Coolant Pump[J]. Nuclear Power Engineering, 2023, 44(6): 231-236. doi: 10.13832/j.jnpe.2023.06.0231

Citation:

Zhong Yun, Zhou Wenxia. A More Widely Applicable Calculation Method for Coastdown of Reactor Coolant Pump[J]. Nuclear Power Engineering, 2023, 44(6): 231-236. doi: 10.13832/j.jnpe.2023.06.0231

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A More Widely Applicable Calculation Method for Coastdown of Reactor Coolant Pump

doi: 10.13832/j.jnpe.2023.06.0231

Shanghai Nuclear Engineering Research & Design Institute Co., Ltd., Shanghai, 200240, China

Received Date: 2022-12-18
Rev Recd Date: 2023-05-04
Publish Date: 2023-12-15

Abstract

Abstract

The applicable range of coastdown speed and flow analytical formulae based on similarity theory was investigated by using mature RELAP numerical calculation model, and then a more widely applicable calculation method for Reactor Coolant Pump (RCP) coastdown calculation was first proposed. The analytical formula of coastdown speed based on similarity theory is basically applicable to the conditions when the initial kinetic energy ratio (ε) is less than 3, while the analytical flow coastdown formula applicability is limited to conditions for which ε is lower than 0.3. When ε ≥ 0.3, the characteristics of flow, torque, head and ε deviate from similar conditions, which leads to invalid assumption of coastdown formulae, resulting in large error in calculation results of the formulae. Both the speed and flow coastdown formulae are applicable to coastdown calculation of PWR Reactor Coolant System and RCP test loops, because their ε is normally below 0.3; the error of coastdown formulae are within 10% normally, and the calculated speed error is less than flow error. A correction method for coastdown flow formula with ε ≥ 0.3 is proposed in this paper, which extends the applicable range of coastdown flow formula and is applicable for new reactor development.low formula with ε beyond 0.3 was developed, which expands the applicable range of coastdown formula and is applicable for new reactor development.
- Reactor coolant pump,
- Coastdown,
- Analytical formulae,
- Applicable range

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References(15)

References

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