10 CFR 50.73(a)(1), Submit an LER

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General Reporting requirement to Submit an LER OR in the case of an invalid actuation of plant equipment (specific list see 10 CFR 50.73(a)(2)(iv)) a telephone call can be made in lieu of the LER. Most commonly know as the Invalid Actuation reporting criteria.

Unless otherwise specified, this part of the rule requires reporting of an event if it occurred within 3 years prior to discovery, regardless of the plant mode or power level and regardless of the significance of the structure, system, or component that initiated the event. In the case of an invalid actuation reported under 10 CFR 50.73(a)(2)(iv), the licensee may, at its option, provide a telephone notification to the NRC Operations Center within 60 days after discovery of the event instead of submitting a written LER.

NoteNote: This is used as a reporting criteria when a 60-day ENS report is made due to invalid actuation of systems

System Actuation Reporting Summary

Valid Invalid
Moved ENS + LER LER (as 60 day ENS)
Not moved ENS + LER None

4-hour (ENS)

While Critical or RPS (ie Scram)

8-hour (ENS)

60-day (LER)

60-day (ENS)

Allowance for invalid signals which actuated a system

System actuation list

System Actuation Reporting contains a list of applicable systems

Both list include:

(1) Reactor protection system (RPS) including: Reactor scram and reactor trip.
(2) General containment isolation signals affecting containment isolation valves in more than one system or multiple main steam isolation valves (MSIVs).
(3) Emergency core cooling systems (ECCS) for pressurized water reactors (PWRs) including: High-head, intermediate-head, and low-head injection systems and the low pressure injection function of residual (decay) heat removal systems.
(4) ECCS for boiling water reactors (BWRs) including: High-pressure and low-pressure core spray systems; high-pressure coolant injection system; low pressure injection function of the residual heat removal system.
(5) BWR reactor core isolation cooling system; isolation condenser system; and feedwater coolant injection system.
(6) PWR feedwater system or emergency feedwater system.
(7) Containment heat removal and depressurization systems, including containment spray and fan cooler systems.
(8) Emergency ac electrical power systems, including: Emergency diesel generators (EDGs); hydroelectric facilities used in lieu of EDGs at the Oconee Station; and BWR dedicated Division 3 EDGs.

Only 50.73: (9) Emergency service water systems that do not normally run and that serve as ultimate heat sinks.