10 CFR 50.73(a)(2)(iv)(A), System Actuation

From kanterella
Jump to navigation Jump to search

System Actuation

see combined system actuation description under: 10 CFR 50.72(b)(3)(iv)(A), System Actuation

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.