Topic:  Electrical Hot Shorts - Associated Circuits by Spurious
 

Proposed Risk-Informed Inspector Guidance for Post-Fire SSD Associated Circuit Inspections, dated March 19, 2003

The proposed guidance was issued following the NRC workshop conducted on February 19, 2003, to discuss risk-informing inspection of associated circuits.

Memo Summary:
1) inspectors should pay particular attention to events that could occur in the first hour,
2) inspectors should focus on conductor to conductor shorts within a multi conductor cable,
3) inspectors should assume a maximum of two concurrent spurious operations for each scenario evaluated.

Additional discussion is included relative to credible fire scenarios, cable failure modes, thermoplastic and thermoset cable attributes