Issue 149: Adequacy of Fire Barriers
DESCRIPTION
Historical Background
This issue was raised in SECY-89-170[1]and addressed the effect of premature failure of fire
Issue 148: Smoke Control and Manual Fire-Fighting Effectiveness
DESCRIPTION
Historical Background
This issue was raised in SECY-89-170[1]and addressed the effectiveness of manual fire-fighti
Issue 147: Fire-Induced Alternate Shutdown/Control Room Panel Interactions
DESCRIPTION
Historical Background
This issue was raised in SECY-89-170[1]and addressed the potential for control system vulner
Issue 146: Support Flexibility of Equipment and Components
DESCRIPTION
Historical Background
This issue was identified[1]by NRR when concerns were expressed that the seismic loading on
Issue 145: Actions to Reduce Common Cause Failures
DESCRIPTION
Historical Background
This issue was identified as an alternative approach to the Finding 15 recommendation[1]disc
Issue 144: Scram Without a Turbine/Generator Trip
DESCRIPTION
Background
Before 1989, there were several reported occurrences of the failure of turbine/generators to trip after a reactor scram.
Issue 143: Availability of Chilled Water Systems and Room Cooling
DESCRIPTION
Historical Background
In past years, several nuclear plants experienced problems with safety system components and control systems that resulted from a partial or total loss
Issue 142: Leakage Through Electrical Isolators in Instrumentation Circuits
DESCRIPTION
Historical Background
Electronic isolators are used to maintain electrical separation between safety and non-safety-related electrical systems in nuclear power plants, preven
Issue 141: Large-Break LOCA With Consequential SGTR
DESCRIPTION
Historical Background
Large-break loss-of-coolant accidents (LBLOCA) with consequential steam generator tube ruptures (SGTR)
Issue 140: Fission Product Removal Systems
DESCRIPTION
The issue, as originally proposed,[1]addressed the concern for fission product removal by the containment sprays and suppr