ENS 41706
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ENS Event | |
|---|---|
05:54 May 18, 2005 | |
| Title | Loss of Balance of Plant Power Due to Transformers Lockout |
| Event Description | {{#Wiki_filter:At 0154, 5/18/2005, during performance of relay testing, differential lockout 86T3 was manually actuated resulting in lockout of transformers XTF 31 and XTF 32. This resulted in a loss of all balance of plant (BOP) buses, loss of vital bus 1DB, an auto start of 'B' Diesel Generator (DG), and the sequencing of required ESF loads.
At 0154, during relay testing, the 86T3 differential lockout was actuated. This resulted in a total isolation of XTF0031/32 which de-energized all of the BOP power to the plant and the XSW1 DB switchgear. Plant Engineered Safeguards Features (ESF) systems responded per design as the 'B' DG started and sequenced ESF loads. There were no major problems due to the event; however, the Diesel Fire Pump did not start as expected on a loss of BOP bus 1 C2. The Control Room entered AOP-304.3, 'Loss of All Balance of Plant Buses' and SOP-306, Section B, 'Operation of Diesel Generator 'B' After An Automatic Start And Load'. Preliminary review of plant response shows the RHR flow was in the process of coasting down and was restored to full flow within 20 seconds. The inlet temperature of the Residual Heat Removal (RHR) Heat Exchanger increased approximately 0.3 �F due to this event. There was no change in Reactor Coolant System level. V. C. Summer is currently shutdown in Mode 5 during Refueling Outage 15. All plant systems are currently restored to normal configuration for Mode 5 refueling activities and there were no reported reactivity issues associated with this incident. The licensee notified the NRC Resident Inspector and will notify the State, local and other government agencies. }} |
| Where | |
|---|---|
Summer  South Carolina (NRC Region 2) | |
| Reporting | |
| 10 CFR 50.72(b)(3)(iv)(A), System Actuation | |
| Time - Person (Reporting Time:+3.55 h0.148 days <br />0.0211 weeks <br />0.00486 months <br />) | |
| Opened: | Arnie Cribb 09:27 May 18, 2005 |
| NRC Officer: | Arlon Costa |
| Last Updated: | May 18, 2005 |
| 41706 - NRC Website
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Unit 1 | |
|---|---|
| Reactor critical | Not Critical |
| Scram | No |
| Before | Cold Shutdown (0 %) |
| After | Cold Shutdown (0 %) |
WEEKMONTHYEARENS 569782024-02-19T07:36:00019 February 2024 07:36:00
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