Document: NUREG-0800
Document ID: 32179098-f78d-4852-9c29-1e5e3abb2705
Document Type: srp
Title: RISK-INFORMED DECISION MAKING:  TECHNICAL SPECIFICATIONS
Source: NUREG-0800
Source URL: https://www.nrc.gov/docs/ML0703/ML070380228.pdf
Revision Date: 2023-06
Chapter: 16
Section ID: 16.1
CFR Part: 
CFR Title: 

Content:
tenance are identified. (3) Whether the TS change specifies that voluntary removal of equipment from service should not be scheduled when adverse weather conditions or other situations that likely may subject the plant to abnormal conditions are predicted. (4) Whether the TS change impact on the safety function should be considered (e.g., impact of an AOT change for the low-pressure safety injection system on the overall availability and reliability of the low-pressure injection function). (iv) Defenses against potential common cause failures are maintained and the potential for introduction of new common cause failure mechanisms is assessed (e.g., TS change requests should consider whether the anticipated operational changes from an AOT or STI change could introduce any new common cause failure modes not previously considered). (v) Independence of physical barriers is not degraded. TS change requests should address the independence of barriers as not degraded by the change (e.g., containment system TS change). 16.1-7 Revision 1 - March 2007 (vi) Defenses against human errors are maintained. TS change requests should consider whether the anticipated operation changes from an AOT or STI change could change the expected operator response or introduce any new human errors not previously considered (e.g., change from maintenance during shutdown to maintenance at power when different personnel and different activities may be involved). (vii) The intent of the GDCs in 10 CFR Part 50, Appendix A (Reference 15), is maintained. B. Safety Margins. The engineering evaluation should assess whether the impact of the proposed TS change is consistent with the principle of maintaining sufficient safety margins (Principle 3). An acceptable set of guidelines for that assessment are summarized here. Other equivalent guidelines are acceptable. Sufficient safety margins are maintained when: (i) Codes and standards (e.g., American Society of Mechanical Engineers, Institute of Electrical