ENS 49195
ENS Event | |
|---|---|
17:39 May 28, 2013 | |
| Title | 60 Day Report - Invalid Actuation of Specified System |
| Event Description | This 60-day optional report as allowed by 10 CFR 50.73(a)(1), is being made under the reporting requirement in 10 CFR 50.73 (a)(2)(iv)(A) to describe an invalid actuation of a specified system, specifically the Nuclear Service Water (RN) system. This event had no impact on public health and safety.
During work to replace a timer associated with an RN (Nuclear Service Water) level circuit, electrical adapters and jumpers were installed incorrectly, resulting in generation of an Emergency Low Pit Level signal. This resulted in an unplanned actuation for RN to realign its suction source from Lake Wylie (normal source) to the alternate source, the SNSWP (Standby Nuclear Service Water Pond). On 5/28/13, with both units at 100% power, a lo-lo level signal was received for A Train RN Pit, initiating the realignment to the SNSWP for both A and B trains. Prior to this event, both trains of RN were aligned to the SNSWP for maintenance. The lo-lo level signal did initiate a start of all available RN Pumps. Associated valves, including RN crossover valve, return header isolation valves and non-essential header isolation valves closed as expected. This separated RN trains A and B. This was a complete actuation for Train A and the system performed as designed for existing plant conditions. This event was entered into the site corrective action program for resolution. The licensee will notify the NRC Resident Inspector, as well as, the State and local governments. |
| Where | |
|---|---|
Catawba  South Carolina (NRC Region 2) | |
| Reporting | |
| 10 CFR 50.73(a)(1), Submit an LER, Invalid Actuation | |
| Time - Person (Reporting Time:+1172.68 h48.862 days <br />6.98 weeks <br />1.606 months <br />) | |
| Opened: | Walter Hunnicutt 14:20 Jul 16, 2013 |
| NRC Officer: | Dong Park |
| Last Updated: | Jul 16, 2013 |
| 49195 - NRC Website
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Unit 1 | |
|---|---|
| Reactor critical | Critical |
| Scram | No |
| Before | Power Operation (100 %) |
| After | Power Operation (100 %) |
Unit 2 | |
|---|---|
| Reactor critical | Critical |
| Scram | No |
| Before | Power Operation (100 %) |
| After | Power Operation (100 %) |
WEEKMONTHYEARENS 491952013-05-28T17:39:00028 May 2013 17:39:00
[Table view]10 CFR 50.73(a)(1), Submit an LER 60 Day Report - Invalid Actuation of Specified System ENS 487062012-12-22T06:42:00022 December 2012 06:42:00 10 CFR 50.73(a)(1), Submit an LER 60 Day Report - Invalid Actuation of the Afw System ENS 443522008-06-09T20:31:0009 June 2008 20:31:00 10 CFR 50.73(a)(1), Submit an LER 60 Day Report - Invalid Actuation of Main Steam Isolation System ENS 440512008-01-24T07:35:00024 January 2008 07:35:00 10 CFR 50.73(a)(1), Submit an LER 60 Day Report - Invalid Actuation of the Nuclear Service Water System ENS 428732006-08-08T20:17:0008 August 2006 20:17:00 10 CFR 50.73(a)(1), Submit an LER 60 Day Report - Invalid Actuation of Auxiliary Feed Pump 2B ENS 411322004-08-22T08:50:00022 August 2004 08:50:00 10 CFR 50.73(a)(1), Submit an LER 60 Day Report - Invalid Actuation of Specified System 2013-05-28T17:39:00 | |