ENS 41425
ENS Event | |
|---|---|
17:58 Feb 20, 2005 | |
| Title | Rps Actuation on Steam Generator Low Level |
| Event Description | {{#Wiki_filter:The following information was reported by fax:
During a plant shutdown from 100% power due to the condition as discussed in previous event notice EN #41423, a valid actuation of the reactor protection system occurred. The plant was in the intermediate shutdown mode at approximately 510�F, using the S/G's to cool the Reactor Coolant System, S/G water level was being controlled with one Auxiliary Feedwater Pump and manual control of its outlet valve. Following the initiation of RCS cooldown, Steam Generator levels began to decrease. The operator began to throttle the operating AFW pump's outlet valve open, however at 1158 on 2/20/05, the Control Room received the Annunciator for S/G B Low-Low Water Reactor Trip, which has a setpoint of 2/3 S/G level channels <17% narrow range level. This caused a Reactor Trip signal to be initiated by the Reactor Protection System. The trip signal was generated, however the plant was already in a shutdown condition with the reactor trip breakers open." All systems were functioning normally. The operator started an additional AFW pump and, at 1206, normal level was restored to S/G B and the automatic Reactor Trip signal cleared. The lowest level during this transient in Steam Generator B was 14.5% narrow range level. The licensee notified the NRC Resident Inspector. }} |
| Where | |
|---|---|
Kewaunee  Wisconsin (NRC Region 3) | |
| Reporting | |
| 10 CFR 50.72(b)(3)(iv)(A), System Actuation | |
| Time - Person (Reporting Time:+-1.35 h-0.0563 days <br />-0.00804 weeks <br />-0.00185 months <br />) | |
| Opened: | Kenneth Ressler 16:37 Feb 20, 2005 |
| NRC Officer: | Mark Abramovitz |
| Last Updated: | Feb 20, 2005 |
| 41425 - NRC Website
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Unit 1 | |
|---|---|
| Reactor critical | Not Critical |
| Scram | No |
| Before | Intermediate Shutdown (0 %) |
| After | Intermediate Shutdown (0 %) |