Title
10 CFR Part 50, Appendix R, requires, in part, that one train of systems necessary to achieve and maintain hot shutdown conditions from either the control room or emergency control station is free of fire damage. On February 6, 2008, the licensee identified an Appendix R non-compliance (see Section 4OA3), where the Train A
4kV switchgear would not be free of fire damage to support safe-shutdown in the unlikely event of a postulated fire in the Train B
4kV switchgear room. The licensee performed a safety-significance evaluation (i.e.,
PRA Study 054) and determined that the issue was not of high safety-significance (i.e., the event had a ACDF of 1.93E-7). The inspectors concurred with the overall results of the licensees evaluation for safety-significance. This finding met the criteria for
enforcement discretion under Interim
Enforcement Policy Regarding
Enforcement Discretion for Certain Fire Protection Issues (
10 CFR 50.48) published in Federal Register Notices dated June 16, 2004; January 14, 2005; and April 18, 2006. (
EA-09-313)
