Emergency Core Cooling System (ECCS) is a set of systems designed to react to postulated design basis accidents. In combination they automatically bring the reactor to a safe shutdown condition.
Includes
see also
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| | Site | Start date | Title | Description |
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| ENS 57741 | Hatch | 4 June 2025 01:37:00 | Unit 1 HIGH-PRESSURE Coolant Injection Inoperable | The following information was provided by the licensee via phone and email:
At 2137 EDT on 06/03/2025, while Unit 1 was at 98 percent power in mode 1, the high-pressure coolant injection (HPCI) turbine stop valve failed to open as required when testing the auxiliary oil pump, resulting in the HPCI system being declared inoperable. The cause of the turbine stop valve failing to open is under investigation. HPCI does not have a redundant system, therefore, this condition is being reported as an eight-hour, non-emergency notification per 10 CFR 50.72(b)(3)(v)(D). Reactor core isolation cooling and low-pressure emergency core cooling systems were operable during this time.
There was no impact on the health and safety of the public or plant personnel. The NRC Resident Inspector has been notified. There was no impact to Unit 2. | | NUREG-0090 Volume 47, Report to Congress on Abnormal Occurrences Fiscal Year 2024 | | 31 May 2025 | NUREG-0090, Vol. 47, Report to Congress on Abnormal Occurrences Fiscal Year 2024 | | | ML25126A076 | Palo Verde | 30 May 2025 | Issuance of Amendment Nos. 225, 225 and 225, Regarding Revision Technical Specifications 3.5.1 and 3.5.2 Safety Injection Tank Pressure Bands and Use Gothic Code | | | 05000263/LER-2024-002-01, Low Pressure Coolant Injection Inoperable Due to Motor Valve Failure | Monticello | 30 May 2025 | Low Pressure Coolant Injection Inoperable Due to Motor Valve Failure | | | ML25149A224 | South Texas | 29 May 2025 | Final ASP Analysis - South Texas Project 1, Condition Prohibited by TS and Potential Loss of Safety Function of Pressurizer PORV (LER 498-2024-006) - Precursor | | | ML25098A308 | Diablo Canyon | 28 May 2025 | Issuance of Amendment Nos. 250 and 252 Revise Technical Specifications to Adopt TSTF-541 | | | ML25114A198 | | 28 May 2025 | Semiannual Status Report on the Licensing Activities and Regulatory Duties (October 2024 - March 2025) Attachment | | | LG-25-083, Issuance of the Core Operating Limits Report (COLR) for Unit 2 Reload 18, Cycle 19 | Limerick | 28 May 2025 | Issuance of the Core Operating Limits Report (COLR) for Unit 2 Reload 18, Cycle 19 | | | ML25148A090 | Nuclear Energy Institute | 27 May 2025 | NEI Draft White Paper: Risk Significance of Loss of Coolant Accidents (Locas) and Justification for a Risk-Informed Transition Break Size (Tbs) Methodology | | | 05000364/LER-2025-002, Two Pressurizer Safety Valves Lift Pressure Outside of Technical Specifications Limits Due to Setpoint Drift | Farley | 23 May 2025 | Two Pressurizer Safety Valves Lift Pressure Outside of Technical Specifications Limits Due to Setpoint Drift | |
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