Document: NRC Regulatory Guide
Document ID: da2e0703-3488-44b0-b6d0-089aac7cae3d
Document Type: regulatory_guide
Title: Format and Content of Plant-Specific Pressurized Thermal Shock Safety Analysis Reports for Pressurized Water Reactors
Source: NRC Regulatory Guide Division 1
Source URL: https://www.nrc.gov/docs/ML0037/ML003740028.pdf
Revision Date: 2023-06
Chapter: 
Section ID: RG-1.154
CFR Part: 
CFR Title: 

Content:
g risks that might arise from events other than PTS events t o ensure that overall plant safety i s appropriately balanced. The conditions under which the operator takes each action, the expected time for performing the action, and how the time was derived should be identified. Some examples of these operator actions are: O Trip reactor coolant pumps. O Throttlehermi nate' emergency core cool ant. O Throttl e/termi nate main and emergency feedwater. 0 Restore main and emergency feedwater. O Isolate break (primary or secondary). Supply a summary of training materials associated w i t h overcooling events in general and with respect to principal initiators. In addition, a summary of simulator exercises associated with potenti a1 overcool i ng events should be provided. Note: Proposed improvements in procedures, diagnostic instrumentation, display - systems, and operator training should be presented in Section 8.2 under the 1 i censee' s program of corrective measures. 3. DETERMINATION OF DETAILED PTS SEQUENCES FOR ANALYSES This chapter i s t o present the methods and analyses used t o i d e n t i f y those transient sequences t h a t could contribute significantly t o the PTS r i s k . A good example i s presented i n Chapter 3 o f Reference 3. The scope includes iden- t i f y i ng i n i t i a t i n g events, developing event trees, model ing and quantifying the r e l i a b i l i t y o f relevant systems and operator actions, and collapsin'g the event trees t o i d e n t i f y speci f i c re1 evant sequences. Detai 1 ed models , data, and sample calculations should be included i n appendices o r referenced, However, the l o g i c o f the analysis, c r i t e r i a used, results, and insights gained are t o be described i n the main report. 3.1 Approach Used Describe how the material presented i n t h i s chapter f i t s i n t o the overall PTS study. Provide a general description o f the process used t o i d e n t i f y PTS sequences. It should be made clear how the