ENS 44125

v t e ENS Event
18:45 Apr 7, 2008
Title	Core Element Assembly Calculators Declared Inoperable
Event Description	On 4/7/2008, at approximately 1345 CDT, with ANO-2 in Mode 3 (Hot Shutdown) at normal operating temperature and pressure, and with all control element assemblies (CEAs) withdrawn approximately 2 stops, the Control Room was notified by the Computer Support Group (CSG) that the software verification for CEAC1 and CEAC2 (Core Element Assembly Calculators) had not been verified. Both CEAC's were declared inoperable. The Reed Switch Position Indicators (CEA positions) are considered inoperable if the CEAC's are inoperable. Tech Spec 3.1.3.3 requires at least one of these position indicators be operable in Modes 3 through 5 for each CEA not fully inserted. All CEAs were approximately 2 steps withdrawn from fully inserted during plant heatup to clear the rod bottom indications in preparations for CEA Drop Time Testing. At 1350 the reactor trip breakers were opened and CEA's were verified to be fully inserted to meet the Action Statement for Tech Spec 3.1.3.3. Note that no actual position indication was lost, nor did the CEAC show any signs of malfunction. The software verifications have been completed by the CSG. The licensee notified the NRC Resident Inspector. The licensee also notified the state.

ENS 44125 +/-
Where
Arkansas Nuclear Arkansas (NRC Region 4)
Reporting

10 CFR 50.72(b)(3)(iv)(A), System Actuation
Time - Person (Reporting Time:+1.98 h0.0825 days <br />0.0118 weeks <br />0.00271 months <br />)
Opened:	Chuck Olson 20:44 Apr 7, 2008
NRC Officer:	John Knoke
Last Updated:	Apr 7, 2008
44125 - NRC Website
v • d • e

v t e Emergency Notification System
Arkansas Nuclear with 10 CFR 50.72(b)(3)(iv)(A), System Actuation
WEEKMONTHYEAR2021-11-29T20:58:00 [Table view]
[ENS list for Arkansas Nuclear]

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