--- title: "Chashma-1 nuclear reactor achieves 427 days of uninterrupted operation" description: "Most outlets highlighted the record 427-day uninterrupted operation of the Chashma-1 nuclear reactor and its perfect WANO Performance Indicator Index score. Pakistan Today additionally noted that the achievement occurred during Cycle 18 and specified the location as the Chashma Nuclear Power Plant near Mianwali." url: https://harzaviya.com/stories/10393-chashma-1-sets-427-day-record-for-safe-and-uninterrupted site: HarZaviya language: en --- # Chashma-1 nuclear reactor achieves 427 days of uninterrupted operation business · updated 25 Sep 2026, 11:04 PM PKT · 24–25 Sep 2026 · 8 articles from 8 outlets over 2 developments ## How it developed Newest development first. Each carries its own coverage and, where we have one, our summary of it. ### 25 Sep 2026 — Chashma-1 nuclear reactor achieves 427 days of uninterrupted operation (2 outlets) > Most outlets highlighted the record 427-day uninterrupted operation of the Chashma-1 nuclear reactor and its perfect WANO Performance Indicator Index score. Pakistan Today additionally noted that the achievement occurred during Cycle 18 and specified the location as the Chashma Nuclear Power Plant near Mianwali. - **Pakistan Today** — [Chashma-1 sets PAEC record with 427 days of uninterrupted operation](https://www.pakistantoday.com.pk/2026/09/25/chashma-1-sets-paec-record-with-427-days-of-uninterrupted-operation) · 25 Sep 2026, 11:04 PM PKT > Chashma Nuclear Power Plant Unit-1 sets a new PAEC record with 427 days of safe, uninterrupted operation during Cycle 18. C-1 also achieved a WANO Performance Indicator Index score of 100 in both first two quarters of 2026, highlighting strong reliability and safety - **Profit** — [What Chashma-1’s 427-day run says about Pakistan’s energy future](https://profit.pakistantoday.com.pk/2026/09/25/what-chashma-1s-427-day-run-says-about-pakistans-energy-future) · 25 Sep 2026, 9:15 PM PKT · 84% identical wording to the newest filing > The C-1 Nuclear reactor housed at the Chasmana Nuclear Power Plant near Mianwali has set a record as the longest continuously operating Pakistani nuclear reactor. It has also scored a perfect score on the WANO Performance Indicator Index for six months straight. ### 24 Sep 2026 — Chashma-1 nuclear power plant achieves 427-day uninterrupted operation (6 outlets) > Most outlets highlighted the 427-day uninterrupted operation of Chashma-1 as a new record, noting it was achieved during Cycle 18 and described as the longest continuous operating cycle for a nuclear power plant in Pakistan. While the phrasing varied slightly, the core emphasis on the duration and safety of the operation was consistent across the coverage. A few outlets, such as ProPakistani and Business Recorder, specifically mentioned that the record was set for the Pakistan Atomic Energy Commission (PAEC), while others omitted this detail. - **Dawn** — [Chashma Nuclear Power Plant Unit-1 operates safely for 427 days, setting new record](https://www.dawn.com/news/2032533/chashma-nuclear-power-plant-unit-1-operates-safely-for-427-days-setting-new-record) · 25 Sep 2026, 7:57 AM PKT > https://www.dawn.com/news/2032463 - **Business Recorder** — [C-1 sets PAEC record with 427 days of continuous operation](https://www.brecorder.com/news/40441085/c-1-sets-paec-record-with-427-days-of-continuous-operation) · 25 Sep 2026, 5:35 AM PKT · 80% identical wording to the newest filing > ISLAMABAD: The Chashma Nuclear Power Plant Unit-1 (C-1) has operated safely and without interruption for 427 days during Cycle 18, setting a new record for the longest continuous operating cycle achieved by a nuclear power plant in the history of the Pakistan Atomic Energy Commission (PAEC). The record was accompanied by strong international performance indicators. C-1 achieved a World Associat... - **The Nation** — [C-1 nuclear power plant operates safely for 427 days without interruption](https://www.nation.com.pk/25-Sep-2026/c-1-nuclear-power-plant-operates-safely-427-days-without-interruption) · 25 Sep 2026, 4:38 AM PKT · 82% identical wording to the newest filing > ISLAMABAD - Chashma Nuclear Power Plant Unit-1 (C-1) has operated safely and without interruption for 427 days during Cycle 18, setting a new record for the longest continuous operating cycle achieved by a nuclear power plant in the history of the Pakistan Atomic Energy Commission (PAEC). - **Associated Press of Pakistan** — [Nuclear power plant Chashma-1 Sets PAEC record with 427-Day uninterrupted operation](https://www.app.com.pk/national/nuclear-power-plant-chashma-1-sets-paec-record-with-427-day-uninterrupted-operation/) · 24 Sep 2026, 6:03 PM PKT · 86% identical wording to the newest filing > ISLAMABAD, Sep 24 (APP):Chashma Nuclear Power Plant Unit-1 (C-1) has operated safely and without interruption for 427 days during Cycle 18, setting a new record for the longest continuous operating cycle achieved by a nuclear power plant in the history of the Pakistan Atomic Energy Commission (PAEC). The record was accompanied by strong international performance... - **24 News HD** — [Chashma-1 sets 427-day record for safe and uninterrupted operation](https://www.24newshd.tv/24-Sep-2026/chashma-1-sets-427-day-record-safe-uninterrupted-operation) · 24 Sep 2026, 4:11 PM PKT · 88% identical wording to the newest filing > The Chashma-1 nuclear power plant has achieved a record 427 days of safe and uninterrupted continuous operation, the 24NewsHD TV channel reported on Thursday. - **ProPakistani** — [Nuclear Power Plant Chashma-1 Sets PAEC Record With 427-Day Uninterrupted Operation](https://propakistani.pk/2026/09/24/nuclear-power-plant-chashma-1-sets-paec-record-with-427-day-uninterrupted-operation/) · 24 Sep 2026, 4:00 PM PKT · 87% identical wording to the newest filing > Chashma Nuclear Power Plant Unit-1 (C-1) has operated safely and without interruption for 427 days during Cycle 18, setting a… Read More ## Part of a bigger story Other stories whose coverage resembles this one, nearest first. "% related" compares whole stories, not single articles — see [what the percentages mean](https://harzaviya.com/methodology). - [Pakistan and IAEA sign safeguards agreement for Chashma-5 nuclear plant](https://harzaviya.com/stories/8636-pakistan-iaea-sign-safeguards-agreement-for-chashma-5) · 17 Sep 2026 · 8 outlets · 2 developments · 70% related 8 articles from 8 outlets, 24–25 Sep 2026. Headlines and links belong to their outlets — HarZaviya links out and never copies article text. --- HarZaviya compares how Pakistani outlets cover the same story. It stores and shows each outlet's headline and a short excerpt, and links out — it never copies article text, and every headline belongs to the outlet that wrote it. It takes no stance on any outlet. 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