Analysis of the Invasion of Acetes into the Water Intake of the Daya Bay Nuclear Power Base
Abstract
:1. Introduction
2. Methods
2.1. Numerical Model
2.2. Computational Domain, Boundary Conditions and Cases
2.3. Acetes Migration
2.4. Biological Residual Current
2.5. Lagrange Particle-Tracking Method
2.6. Validation of Hydrodynamic Property
2.6.1. Hydrodynamic Property
2.6.2. Acetes Invasion
3. Results and Discussion
3.1. Flow Field Characteristics
3.2. Characteristics of the Biological Residual Current of Acetes
3.3. Analysis of the Migration Pathways of Invasive Acetes
3.4. Timing Analysis of the Acetes Invasion
3.5. Lagrangian Particle Analysis
4. Conclusions
Author Contributions
Funding
Data Availability Statement
Conflicts of Interest
References
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Date | Description of the Event |
---|---|
10 January 2015 | In this accident, works cleaned approximate 1.3 tonnes of Acetes in the drum net backwash drain at the nuclear power site’s Ling’ao 2 unit. Units 1 and 2 had to operate with lower power. |
9 January 2016 | In the circulating water filtration system, the number of Acetes detected was much higher than the tolerance level of safety design. Units 1 and 2 had to be shut down. |
12 h | 13 h | 14 h | 15 h | 16 h | |
---|---|---|---|---|---|
Calculation time/h | 18:00–6:00 (The following day) | 18:00–7:00 (The following day) | 17:00–7:00 (The following day) | 16:00–7:00 (The following day) | 16:00–8:00 (The following day) |
Date of entry into the stream | 4–14 November | 5–14 November | 5–15 November | 5–14 November | 5–14 November |
Duration of inflow days/d | 10 | 9 | 10 | 9 | 9 |
Date of departure | 11.14–11.20 | 11.14–11.20 | 11.15–11.20 | 11.14–11.20 | 11.14–11.20 |
Duration of outflow days/d | 6 | 6 | 5 | 6 | 6 |
Date of peak residual flow rate | 11.09 | 11.10 | 11.09 | 11.09 | 11.10 |
L0 | L1 | L2 | L3 | L4 | L5 | L6 | L7 | L8 | L9 | L10 | L11 | ||
---|---|---|---|---|---|---|---|---|---|---|---|---|---|
Average biological residual current rate/cm·s−1 | 12 h | 2.89 | 2.80 | 2.46 | 1.86 | 1.40 | 1.10 | 0.95 | 1.09 | 1.46 | 1.64 | 1.90 | 3.44 |
13 h | 2.92 | 2.74 | 2.31 | 1.76 | 1.35 | 1.08 | 0.93 | 1.05 | 1.39 | 1.58 | 1.97 | 3.50 | |
14 h | 3.51 | 3.39 | 2.83 | 2.15 | 1.66 | 1.33 | 1.13 | 1.28 | 1.68 | 1.75 | 2.47 | 3.53 | |
15 h | 3.57 | 3.35 | 2.72 | 2.09 | 1.63 | 1.31 | 1.12 | 1.26 | 1.62 | 1.70 | 1.95 | 3.50 | |
16 h | 3.54 | 3.28 | 2.62 | 2.02 | 1.59 | 1.29 | 1.10 | 1.24 | 1.58 | 1.67 | 1.93 | 3.49 |
Nocturnal Migration Hours | Average Migration Speed through the Segments/km·d−1 | Duration of the Inflow Cycle/d | Determining Whether an Incoming Flow Period Can Reach Section C(Y/N) | Through Various Periods/d | Time of Arrival at the Water Intake/d | ||||
---|---|---|---|---|---|---|---|---|---|
A | B | C | A | B | C | ||||
12 h | 0.91 | 0.52 | 0.99 | 10 | N | 2.6 | >15 | 4.1 | >20 |
13 h | 0.99 | 0.54 | 1.03 | 9 | N | 2.4 | >15 | 3.0 | >20 |
14 h | 1.18 | 0.71 | 1.37 | 10 | Y | 1.9 | 5.8 | 3.0 | 10.7 |
15 h | 1.18 | 0.75 | 1.44 | 9 | Y | 2.0 | 5.5 | 2.9 | 10.4 |
16 h | 1.24 | 0.78 | 1.50 | 9 | Y | 1.9 | 5.3 | 2.8 | 9.9 |
12 h | 13 h | 14 h | 15 h | 16 h | 24 h | |
---|---|---|---|---|---|---|
Acetes invasion time/d | >15 | >15 | 8 | 7 | 6.5 | 12 |
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Li, X.; Yang, L.; Ren, H.; Liu, Z.; Jia, Z. Analysis of the Invasion of Acetes into the Water Intake of the Daya Bay Nuclear Power Base. Water 2022, 14, 3741. https://doi.org/10.3390/w14223741
Li X, Yang L, Ren H, Liu Z, Jia Z. Analysis of the Invasion of Acetes into the Water Intake of the Daya Bay Nuclear Power Base. Water. 2022; 14(22):3741. https://doi.org/10.3390/w14223741
Chicago/Turabian StyleLi, Xinghao, Lin Yang, Huatang Ren, Zhaowei Liu, and Zeyu Jia. 2022. "Analysis of the Invasion of Acetes into the Water Intake of the Daya Bay Nuclear Power Base" Water 14, no. 22: 3741. https://doi.org/10.3390/w14223741