System Affected : Steam and
Feedwater Rupture Control System (SFRCS)
Actuation / Initiator Affected: Main Steam Line Rupture on Steam Generator
Effect of event on plant in current Mode - None
Actions Taken or planned: Declared SFRCS Actuation Channels 1 and 2 inoperable. Will track as a Mode 3 restraint against T.S. 3.3.2.2 (SFRCS Instrumentation). Will resolve, correct and retest prior to entry into Mode 3.
Discovered SFRCS Logic Channel 1 block upon restoration and repowering after maintenance activities on 10/16/03. After discussions with Engineering Department representatives it has been determined that a design issue exists with the SFRCS system where it would be possible that SFRCS Channels 1 and 2 low pressure trips could be blocked during a scenario where a Main Steam Line Rupture would be followed by a loss of off-site power. This would result in the potential that the OTSG [once through steam generators] with the main steam line rupture would be fed by the AFW system. This requires an 8 hour9.259259e-5 days <br />0.00222 hours <br />1.322751e-5 weeks <br />3.044e-6 months <br /> notification to the NRC per 10CFR50.72(b)(3)(ii)(B).
The licensee notified the NRC resident inspector.
