ENS 42531
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ENS Event | |
|---|---|
06:07 Apr 27, 2006 | |
| Title | Low Pressure Steam Line Pressure Safety Injection Signal Inadvertently Initiated |
| Event Description | On 4/27/06 at 02:00, with D.C. Cook Unit 2 in Mode 5 and the Control Rod Drive System de-energized under clearance and incapable of withdrawal, Instrumentation and Controls Technicians were beginning Instrumentation Channel Operational Test and Trip Actuating Device Operational Tests. The block for Main Steam Line Low Pressure Safety Injection was inadvertently removed. This allowed the existing low steam generator pressure (0 psig) and low RCS temperature (186 degrees F) to initiate a Low Steam Line Pressure Safety Injection and a Steam Line Isolation signal.
At 02:07 Unit 2 had a Main Steam Line Low Pressure Safety Injection signal on both Trains. The following components automatically started: Unit 2 West Centrifugal Charging Pump (on minimum flow recirc path with injection path isolated for LTOP -- no injection to RCS) Unit 2 South Safety Injection Pump (on minimum flow recirc path with injection path isolated for LTOP - no injection to RCS) Unit 2 East Residual Heat Removal Pump Unit 2 East Component Cooling Water Pump Unit 2 CD Emergency Diesel Generator Both Trains of Unit 2 Control Room Pressurization Both Trains of Unit 2 Phase A Containment Isolation signal Both Trains of Unit 2 Containment Ventilation Isolation. Both Trains of Unit 1 Control Room Pressurization Fans Unit 1 West Essential Service Water Pump All available equipment actuated as expected for this condition. (The Unit 2 Boron Injection Tank was isolated under clearance for LTOP. The Unit 2 East Centrifugal Charging Pump, Unit 2 West Residual Heat Removal Pump, and Unit 2 West Component Cooling Water Pump were already running. The Unit 2 AB Emergency Diesel Generator was under a clearance for maintenance. The Unit 2 North Safety Injection Pump was under an administrative clearance for LTOP. The Unit 1 East Essential Service Water Pump was already running.) After diagnosing the event, operators manually blocked the Steam Line Isolation and manually reset Safety Injection signals for both trains. Components were returned to normal status for plant conditions. The licensee notified the NRC Resident Inspector. |
| Where | |
|---|---|
Cook  Michigan (NRC Region 3) | |
| Reporting | |
| 10 CFR 50.72(b)(3)(iv)(A), System Actuation | |
| Time - Person (Reporting Time:+3.18 h0.133 days <br />0.0189 weeks <br />0.00436 months <br />) | |
| Opened: | Dale Turinetti 09:18 Apr 27, 2006 |
| NRC Officer: | John Knoke |
| Last Updated: | Apr 27, 2006 |
| 42531 - NRC Website
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Unit 2 | |
|---|---|
| Reactor critical | Not Critical |
| Scram | No |
| Before | Cold Shutdown (0 %) |
| After | Cold Shutdown (0 %) |
WEEKMONTHYEARENS 571952024-06-27T12:04:00027 June 2024 12:04:00
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Steam Generator 2024-06-27T12:04:00 | |
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