On 2/19/2017 at 2323 EST, during
LLRT [local leak rate test] testing per
42SV-TET-001-2, 2T48F320 exceeded the maximum allowable leakage limit. The companion isolation valve in the same line (2T48F319) had previously failed
LLRT. The failure of the 2T48F320 represents a failure of the 2T23X26 penetration to maintain
primary containment integrity.
This event is reportable per 10CFR50.72(b)(3)(ii)(A) since the failure of the 2T23X26 penetration caused primary containment leakage to exceed La [allowable leakage] and thus represents a degraded principle safety barrier.
CR [condition report] 10333178.
NRC Resident Inspector has been notified.
2T48F319 and 2T48F320 are 18 inch dampers.
This event places the licensee in a Technical Specification limit that requires the
dampers to be repaired and pass
LLRT prior to the plant entering Mode 3.
