On March 31, 2014, at 1302 [CDT], with Unit 2 operating in Mode 1 (coastdown), leakage was identified from the body of a one inch isolation valve associated with a
Control Rod Drive Hydraulic Control Unit (
CRD HCU 18-27 insert valve 101). The leakage is several drops per minute; attempts to isolate the leak have been unsuccessful. The associated piping communicates with the
reactor coolant system (through the
CRD mechanism).
Technical Specification 3.4.4 (RCS Operational Leakage), Condition C, was entered at 1302 hours0.0151 days <br />0.362 hours <br />0.00215 weeks <br />4.95411e-4 months <br />. Condition C requires the unit to be placed in Mode 3 (Hot Shutdown) in 12 hours1.388889e-4 days <br />0.00333 hours <br />1.984127e-5 weeks <br />4.566e-6 months <br />. At 1616 hours0.0187 days <br />0.449 hours <br />0.00267 weeks <br />6.14888e-4 months <br />, a Technical Specification required shutdown was initiated on Unit 2.
The cause and resolution of the leakage are being pursued.
This condition is being reported under 50.72(b)(3)(ii)(A) given the defect is associated with the primary coolant system pressure boundary. This notification is also being made in accordance with 10 CPR 50.72(b)(2)(i) given the initiation of a plant shutdown required by the plant Technical Specifications.
The licensee has notified the NRC Resident Inspector.
