EPRI ALWR ========= This page contains some high-level requirements sourced from the EPRI Advanced Light Water Reactor Utility Requirements Document :cite:p:`mprAdvancedLightWater99a` .. req:: Passive ALWRs shall not require safety-related AC electric power other than inverter supplied AC power for I&C. :id: R_ALWR_1 .. req:: 72-hours without manual operator action. :id: R_ALWR_2 For transients and accidents analyzed under the initiating event plus single failure Licensing Design Basis assumptions (which include loss of all ac power), no credit for manual operator action shall be necessary to meet core protection regulatory limits for at least 72 hours following initial indication of the need for action (i.e., approximately the time of the initiating event). .. req:: Only simple actions and assistance shall be necessary beyond 72 hours :id: R_ALWR_3 .. req:: Off-site dose limits shall be maintained for at least 72 hours without the need for off-site assistance. :id: R_ALWR_4