Document: NUREG-0800
Document ID: 5cdeed4a-6cd5-4840-90c0-5159fbf2c9f0
Document Type: srp
Title: CHILLED WATER
Source: NUREG-0800
Source URL: https://www.nrc.gov/docs/ML1409/ML14093A350.pdf
Revision Date: 2023-06
Chapter: 9
Section ID: 9.2.7
CFR Part: 
CFR Title: 

Content:
tated in the SAR, assuming a concurrent LOOP and failure of a single, active component, including a single failure of any auxiliary electric power source. The SAR is reviewed for whether, for each VWS component or subsystem affected by the LOOP or instrument air systems, system flow and heat transfer capability exceed minimum regulatory requirements. The 9.2.7-21 Draft Revision 0 – July 2014 results of failure-modes and -effects analyses are considered for whether the system meets these regulatory requirements. This consideration is an acceptable verification of system functional reliability. RTNSS B: applies. RTNSS B SSCs are considered risk-significant. RTNSS B SSCs do not need to operate during accident conditions, but are required for the post-72 hour period. Replace paragraph 5.G with the following: Components and subsystems can function as required in a LOOP and loss of instrument air systems. The system design is acceptable if the VWS meet minimum system requirements as stated in the SAR, assuming a concurrent failure of a single active component, including a single failure of any auxiliary electric power source. The SAR is reviewed for whether, for each VWS component or subsystem affected by the LOOP or instrument air systems, system flow and heat transfer capability exceeds minimum requirements. RTNSS C: applies. RTNSS C SSCs do not need to operate during accident conditions, but are relied upon in order to meet NRC safety goals. Replace paragraph 5.G with the following: Components and subsystems can function as required in a loss of offsite power (LOOP) and loss of instrument air systems. The system design is acceptable if the VWS meet minimum system requirements as stated in the SAR. The SAR is reviewed for whether, for each VWS component or subsystem affected by the LOOP or loss of instrument air systems, system flow and heat transfer capability exceeds minimum requirements. Nonsafety-related nonrisk-significant: may apply. SSCs that support achieving