Document: NUREG-0800
Document ID: 92d817ac-3ce3-4cf7-8d1a-627e8242fbf2
Document Type: srp
Title: PLANT DESIGN FOR PROTECTION AGAINST POSTULATED PIPING FAILURES
Source: NUREG-0800
Source URL: https://www.nrc.gov/docs/ML0520/ML052070312.pdf
Revision Date: 2023-06
Chapter: 3
Section ID: 3.6.1
CFR Part: 
CFR Title: 

Content:
Systems and components required to shut down the reactor and mitigate the consequences of a postulated piping failure, without offsite power. Fluid Systems. High and moderate energy fluid systems that are subject to the postulation of piping failures outside containment against which protection of essential systems and components is needed. High Energy Fluid Systems. Fluid systems that, during normal plant conditions are either in operation or maintained pressurized under conditions where either or both of the following are met: a. Maximum operating temperature exceeds 95 C (200 F), or 33 b. Maximum operating pressure exceeds 1900 kPa (275 psig).34 Moderate Energy Fluid Systems. Fluid systems that, during normal plant conditions, are either in operation or maintained pressurized (above atmospheric pressure) under conditions where both of the following are met: a. Maximum operating temperature is 95 C (200 F) or less, and 35 b. Maximum operating pressure is 1900 kPa (275 psig) or less 36 Normal Plant Conditions. Plant operating conditions during reactor startup, operation at power, hot standby, or reactor cooldown to cold shutdown condition. Upset Plant Conditions. Plant operating conditions during system transients that may occur with moderate frequency during plant service life and are anticipated operational occurrences, but not during system testing. Postulated Piping Failures. Longitudinal and circumferential breaks in high energy fluid system piping and through-wall leakage cracks in moderate energy fluid system piping postulated according to the provisions of BTP EMEB 3-1, attached to SRP Section 3.6.2. Single Active Component Failure. Malfunction or loss of function of a component of electrical or fluid systems. The failure of an active component of a fluid system is considered to be a loss of component function as a result of mechanical, hydraulic, pneumatic, or electrical malfunction, but not the loss of component structural integrity. The direct