ENS 44085
ENS Event | |
|---|---|
13:13 Mar 21, 2008 | |
| Title | System Injection Determined Inoperable by Failure to Remove Electrical Jumper Prior to Mode Change |
| Event Description | In accordance with Instrument Maintenance Instruction (IMI) 99.040, 'Auto Safety Injection (SI) Block, Feedwater Isolation Block, and Maintain Source Range In Service Jumpers,' jumpers were placed to block the SI automatic actuation logic and actuation relays during WBNs [Watts Bar Nuclear] Cycle 8 refueling outage. The automatic actuation function for SI is required in Modes 1, 2, 3, and 4 per Function 1.b of Table 3.3.2-1 of Technical Specification (TS) 3.3.2, 'ESFAS Instrumentation.' WBN entered Mode 4 at 0020 EDT on March 20, 2008 and Mode 3 at 0100 EDT on March 21, 2008. On March 21, 2008, it was discovered that the jumpers installed per IMI-99.040 had not been removed. Due to this, Limiting Condition for Operation (LCO) 3.0.3, was entered at 0913 EDT and exited at 0958 EDT when the system was restored. The jumpers being in place in Mode 4 and 3 rendered both trains of SI automatic actuation inoperable for approximately 33 hours3.819444e-4 days <br />0.00917 hours <br />5.456349e-5 weeks <br />1.25565e-5 months <br /> and 38 minutes. This event is being reported under 10 CFR 50.72(b)(3)(v)(D), 'Event or Condition that could have Prevented Fulfillment of a Safety Function.'
The licensee attributes the error to a combination of both procedural inadequacy (i.e., the step removing the jumper did not require verification) and personnel error. The licensee informed the NRC Resident Inspector.
This is a follow-up notification to EN#44085 to amend reported information. At 2133 on 3/21/08 when permissive P-11(Low Pressure and Low Steamline Pressure) blocks were cleared, the on-shift crew questioned the presence of the 'AUTO SI Blocked' alarm and determined that it should have been cleared when the SI automatic logic jumper was removed earlier in the day. The crew utilized the procedural guidance of GO-1 to cycle the reactor trip breakers and reinstate the automatic safety injection logic at 2206 on 3/21/08. The previous report that identified that LC0 3.0,3 was exited at 0958 EDT is to be amended. LCO 3.0.3 was exited at 2206 when SI automatic logic was completely reinstated by cycling the reactor trip breakers. The licensee notified the NRC Resident Inspector. Notified R2DO(Ernstes) |
| Where | |
|---|---|
Watts Bar  Tennessee (NRC Region 2) | |
| Reporting | |
| 10 CFR 50.72(b)(3)(v)(D), Loss of Safety Function - Mitigate the Consequences of an Accident | |
| LER: | 05000390/LER-2008-001 05000391/LER-2016-001 |
| Time - Person (Reporting Time:+3.45 h0.144 days <br />0.0205 weeks <br />0.00473 months <br />) | |
| Opened: | Greg Evans 16:40 Mar 21, 2008 |
| NRC Officer: | Steve Sandin |
| Last Updated: | Mar 22, 2008 |
| 44085 - NRC Website | |
Unit 1 | |
|---|---|
| Reactor critical | Not Critical |
| Scram | No |
| Before | Hot Standby (0 %) |
| After | Hot Standby (0 %) |