On 10/12/05 at 14:40 EDT, Unit 1 experienced a loss of Channel A of the CIS (Containment Isolation Signal) Radiation Monitor which, when combined with the previous existing inoperability of Channel D of the CIS radiation monitor, required Unit 1 to enter technical specification
LCO 3.0.3. If the action statement [for the CIS],
LCO 3.3.2.1, cannot be met, within
1 hour1.157407e-5 days <br />2.777778e-4 hours <br />1.653439e-6 weeks <br />3.805e-7 months <br />, action shall be initiated to place the unit in Hot Standby with the next
6 hours6.944444e-5 days <br />0.00167 hours <br />9.920635e-6 weeks <br />2.283e-6 months <br />, Hot Shutdown within the following
6 hours6.944444e-5 days <br />0.00167 hours <br />9.920635e-6 weeks <br />2.283e-6 months <br />, and cold shutdown within the subsequent
24 hours2.777778e-4 days <br />0.00667 hours <br />3.968254e-5 weeks <br />9.132e-6 months <br />. Unit shutdown is in progress.
The licensee notified the NRC Resident Inspector.
- * * UPDATE FROM LICENSEE (C. MARPLE) TO NRC (HUFFMAN) AT 2145 EDT ON 10/12/05 * * *
At 2101 EDT on 10/12/05, the Unit 1 exited Technical Specification 3.0.3 when Channel D of the CIS radiation monitor was returned to service. The down-power of Unit 1 was halted at 97% power.
The licensee notified the NRC Resident Inspector. R2DO(Decker) informed.
