Please read the following table in Markdown format and then answer the question according to the table. Table cells in one row are seperated by '|', and different rows are seperated by '
'.

Table:
| Location | Reactor type | Status | Net\nCapacity\n(MWe) | Gross\nCapacity\n(MWe) |
| --- | --- | --- | --- | --- |
| Chernobyl-1 | RBMK-1000 | shut down in 1996 | 740 | 800 |
| Chernobyl-2 | RBMK-1000 | shut down in 1991 | 925 | 1,000 |
| Chernobyl-3 | RBMK-1000 | shut down in 2000 | 925 | 1,000 |
| Chernobyl-4 | RBMK-1000 | destroyed in the 1986 accident | 925 | 1,000 |
| Chernobyl-5 | RBMK-1000 | construction cancelled in 1988 | 950 | 1,000 |
| Chernobyl-6 | RBMK-1000 | construction cancelled in 1988 | 950 | 1,000 |
| Ignalina-1 | RBMK-1500 | shut down in 2004 | 1,185 | 1,300 |
| Ignalina-2 | RBMK-1500 | shut down in 2009 | 1,185 | 1,300 |
| Ignalina-3 | RBMK-1500 | construction cancelled in 1988 | 1,380 | 1,500 |
| Ignalina-4 | RBMK-1500 | plan cancelled in 1988 | 1,380 | 1,500 |
| Kostroma-1 | RBMK-1500 | construction cancelled in 1980s | 1,380 | 1,500 |
| Kostroma-2 | RBMK-1500 | construction cancelled in 1980s | 1,380 | 1,500 |
| Kursk-1 | RBMK-1000 | operational until 2021 | 925 | 1,000 |
| Kursk-2 | RBMK-1000 | operational until 2024 | 925 | 1,000 |
| Kursk-3 | RBMK-1000 | operational until March 2014 | 925 | 1,000 |
| Kursk-4 | RBMK-1000 | operational until February 2016 | 925 | 1,000 |
| Kursk-5 | MKER-1000 | construction begin was 1985, since then shelved | 925 | 1,000 |
| Kursk-6 | RBMK-1000 | construction cancelled in 1993 | 925 | 1,000 |
| Leningrad-1 | RBMK-1000 | operational | 925 | 1,000 |
| Leningrad-2 | RBMK-1000 | operational until 2021 | 925 | 1,000 |
| Leningrad-3 | RBMK-1000 | operational until June 2025 | 925 | 1,000 |
| Leningrad-4 | RBMK-1000 | operational until August 2026 | 925 | 1,000 |
| Smolensk-1 | RBMK-1000 | operational until December 2022 | 925 | 1,000 |
| Smolensk-2 | RBMK-1000 | operational until July 2015 | 925 | 1,000 |
| Smolensk-3 | RBMK-1000 | operational until July 2023 | 925 | 1,000 |
| Smolensk-4 | RBMK-1000 | construction cancelled in 1993 | 925 | 1,000 |
Question:
which reactor is the only one that is operational until august 2026?
Answer:
Leningrad-4