Document: 10 CFR Part 50
Document ID: 96de988b-1ca6-4fa0-b3f6-45aa1e23985a
Document Type: cfr
Title: Immediate notification requirements for operating nuclear power reactors.
Source: 10 CFR Part 50
Source URL: https://www.ecfr.gov/current/title-10/part-50/section-50.72
Revision Date: 
Chapter: 
Section ID: 50.72
CFR Part: 50
CFR Title: 10

Content:
dioactively contaminated materials. ( 3 ) Eight-hour reports. If not reported under paragraphs (a) , (b)(1) or (b)(2) of this section, the licensee shall notify the NRC as soon as practical and in all cases within eight hours of the occurrence of any of the following: ( i ) [Reserved] ( ii ) Any event or condition that results in: ( A ) The condition of the nuclear power plant, including its principal safety barriers, being seriously degraded; or ( B ) The nuclear power plant being in an unanalyzed condition that significantly degrades plant safety. ( iii ) [Reserved] ( iv ) ( A ) Any event or condition that results in valid actuation of any of the systems listed in paragraph (b)(3)(iv)(B) of this section, except when the actuation results from and is part of a pre-planned sequence during testing or reactor operation. ( B ) The systems to which the requirements of paragraph (b)(3)(iv)(A) of this section apply are: ( 1 ) Reactor protection system (RPS) including: Reactor scram and reactor trip. [ 4 ] ( 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 auxiliary 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);