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NUREG Investigation
Report No. NUREG-LER-2010-004-01
2010
Operational Operational
Browns Ferry 1 号机 余热排出泵(RHR)电机失效导致堆芯冷却瞬态（LER 2010-004-01）
Browns Ferry Nuclear Plant, Unit 1, Alabama (NRC LER 50-259/2010-004-01)
Related equipment → Centrifugal pump (centrifugal_pump)
0Fatalities
0Injuries
FailureMechanism code ELP
⌗Failure Mode · ISO 14224 Mapping
Damage mechanism (recorded in KB)
FailureELP
ISO functional code (as recorded)
ISO 14224:2016 functional failure code
ELP · External leakage - process
ISO ELP — External leakage - process.
1What Happened
RHR 泵 A 电机定子/绕组绝缘退化伴轴承问题→电机失效，余热排出(RHR)功能丧失，触发堆芯冷却相关瞬态
2Root Cause
电机绝缘/轴承老化退化导致失效
3Reliability Lessons (from investigation root cause)
- The 'Root Cause' above is the core lesson of this accident; not split further.
4Associated Failure Mechanisms (Keywords)
RHR泵 余热排出泵 电机 定子 绕组 轴承 绝缘退化 泵失效
About the Failure-Mode Code (click to expand)
The recorded code ELP is an ISO 14224:2016 functional failure code (describes what the equipment failed to do). The damage mechanism (how it failed) is shown in the Mapping block above. The two are distinct dimensions in ISO 14224.
5Evidence Source (transparent)
Authority：U.S. Nuclear Regulatory Commission (NRC) — Licensee Event Report (LER)
Official Report：www.nrc.gov ↗
Data Verification：verified_url_nrc_pdf_2026-08-07
↗Related Failure Modes · Traceability