Document: NUREG-0800
Document ID: 42e7682f-df25-4a6a-94f4-7d44ea029702
Document Type: srp
Title: STEAM SYSTEM PIPING FAILURES INSIDE AND OUTSIDE OF CONTAINMENT
Source: NUREG-0800
Source URL: https://www.nrc.gov/docs/ML0520/ML052070677.pdf
Revision Date: 2023-06
Chapter: 15
Section ID: 15.1.5
CFR Part: 
CFR Title: 

Content:
core burnup that yieldings the minimum margins has been selected. is evaluated. 48 CPB is consulted regardingSRXB also reviews core-related parameters such as 49 DNB correlations and the values of the reactivity parameters used in the analysis. The reviewer confirms that the amount of secondary coolant expelled from the system (for breaks outside containment) has been calculated conservatively by evaluating the methods and assumptions, by comparing these results with those of an acceptable analysis performed on another plant of similar design, or by comparing them with staff calculations for typical plants done by RSBSRXB.50 b. The acceptability of the methods equations, sensitivity studies, and models proposed by the applicant are evaluated. DRAFT Rev. 3 - April 1996 15.1.5-10 c. Analytical models should be sufficiently detailed to simulate the reactor coolant (primary), steam generator (secondary), and auxiliary systems. The reviewer evaluates the following functional requirements: (1) Reactor trip signal: credit taken for any reactor trip signal is reviewed by ICSB HICB to confirm that, under accident conditions, the instrumentation and control systems are capable of the assumed response. (2) Emergency core cooling system (ECCS): credit taken for actuation of the ECCS is reviewed by ICSB HICB to verify the ability of the instrumentation and control systems to respond as assumed. (3) Auxiliary feedwater system: the availability of the auxiliary feedwater system to supply adequate auxiliary feedwater flow to the intact steam generators during the accident and the subsequent shutdown condition is evaluated. This is done by ASB SPLB as to availability of the system 51 and by RSBSRXB as to capability to effect an orderly shutdown. Since auxiliary feedwater system designs are diverse and may require both automatic and manual actuation, preoperational tests should be specified to identify any necessary operator actions and to establish times required for their