A main steam line (MSL) are the pipes which carry steam from the reactor to the main turbine. The isolation device is main steam isolation valves.
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| | Site | Start date | Title | Description |
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| IR 05000416/2025001 | Grand Gulf | 13 February 2026 | Integrated Inspection Report 05000416/2025001 - Revised | | | IR 05000458/2025004 | River Bend | 11 February 2026 | Integrated Inspection Report 05000458/2025004 | | | ML26030A089 | | 10 February 2026 | Monthly Federal Register Notice - Applications and Amendments to Facility Operating Licenses and Combined Licenses Involving No Significant Hazards Considerations - Publication Date: February 17, 2026 | | | ML25356A366 | Susquehanna | 10 February 2026 | Issuance of Amendment Nos. 290 and 274 Modification to Technical Specification 3.6.1.3 and Main Steam Isolation Valve Leakage Requirements | | | ML26008A003 | Nine Mile Point | 9 February 2026 | Frn/Exemption from a Requirement in Appendix J to 10 CFR Part 50 Regarding Leakage Rate Testing for Main Steam Isolation Valves (EPID L-2025-LLE-0005) - FRN (NRC-2026-0199) | | | IR 05000277/2025004 | Peach Bottom | 5 February 2026 | Integrated Inspection Report 05000277/2025004 and 05000278/2025004 and Independent Spent Fuel Storage Installation Inspection Report 07200029/2024001 and Exercise of Enforcement Discretion | | | ML26020A287 | Byron
Braidwood | 4 February 2026 | Issuance of Amendment Nos. 245, 245, 243 and 243 to Adopt Technical Specifications Task Force Travelers TSTF 286, TSTF 471, and TSTF 571 | | | IR 05000354/2025004 | Salem
Hope Creek | 4 February 2026 | Integrated Inspection Report 05000354/2025004 and Independent Spent Fuel Storage Installation Inspection Report 07200048/2024001 and Exercise of Enforcement Discretion | | | ML26008A004 | Nine Mile Point | 4 February 2026 | Issuance of Amendment No. 201, Revision of Surveillance Requirement to a Reduced Test Pressure and Corresponding Leakage Rate for Main Steam Isolation Valves | | | IR 05000397/2025004 | Columbia | 4 February 2026 | Integrated Inspection Report 05000397/2025004 | |
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