ENS 43753
ENS Event | |
|---|---|
02:03 Oct 29, 2007 | |
| Title | Refuel Floor Exhaust Hi-Hi Radiation Alarms During Reactor Reassembly |
| Event Description | On 10/28/07 at 2203 in Operational Condition 5, two of three Refuel Floor Exhaust Radiation Monitors actuated on HI-HI Radiation during the Moisture Separator lift for Reactor Pressure Vessel Reassembly. Reactor Building Ventilation was procedurally secured at the time of the actuation to minimize the potential for airborne contamination. The cause of the elevated radiation levels at the Refuel Floor Exhaust Radiation Monitors is currently attributed to the lifting of the Moisture Separator closer to the surface of the water to obtain an unobstructed underwater path to the Reactor Pressure Vessel. The resulting ESF signal yielded an automatic start of the 'A' and 'D' Station Service Water Pumps, the Filtration Recirculation and Ventilation System, and load-shed of non-1E breaker loads. All systems responded as expected. Systems and components actuated by the condition have been restored to a normal stand-by alignment as required. No other systems were affected and the plant is stable in Operational Condition 5.
The licensee will notify the NRC Resident Inspector. The licensee notified the Lower Alloways Creek Township.
Follow up investigation has revealed that the initiation of the signals was the result of radiation levels outside of the Refuel Floor Exhaust duct, and not from the in-duct activity. This would not be considered the parameter satisfying the requirements for initiation of the safety function of the system. The actual plant condition that satisfies the requirements for initiation of the safety function of the system is to detect conditions and initiate protective actions due to a release of steam or radioactive material internal to the duct that could result in the release of fission products to the environment. As a result, this is not considered a 'valid actuation' and is being retracted. Also, upon review of the refuel floor camera system, the reason for the HI-HI actuation was that during the Moisture Separator lift, the Moisture Separator broke the surface of the water by approximately 24 inches. This caused the radiation monitors to alarm on radiation shine from the moisture separator rather than airborne activity in the exhaust duct. This notification also provides telephone notification of an invalid actuation other than actuation of the reactor protection system instead of submitting a written LER 1. This is not considered an LER 2. This report is being made under 10 CFR 50.73(a)(2)(iv)(A). 3. The resulting ESF signal yielded an automatic start of the 'A' and 'D' Station Service Water Pumps, the Filtration, Recirculation and Ventilation System (FRVS), and load-shed of non-1E breaker loads: all systems responded as expected. This was a complete actuation. All required systems started and functioned successfully. The licensee notified the NRC Resident Inspector. Notified the R1DO (Holody). |
| Where | |
|---|---|
Hope Creek  New Jersey (NRC Region 1) | |
| Reporting | |
| 10 CFR 50.72(b)(3)(iv)(A), System Actuation | |
| Time - Person (Reporting Time:+0.15 h0.00625 days <br />8.928571e-4 weeks <br />2.0547e-4 months <br />) | |
| Opened: | Bernie Litkett 02:12 Oct 29, 2007 |
| NRC Officer: | Jeff Rotton |
| Last Updated: | Nov 13, 2007 |
| 43753 - NRC Website
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WEEKMONTHYEARENS 541982019-08-03T23:47:0003 August 2019 23:47:00
[Table view]10 CFR 50.72(b)(2)(iv)(B), RPS System Actuation, 10 CFR 50.72(b)(3)(iv)(A), System Actuation Manual Reactor Trip and Manual Actuation of Reactor Core Isolation Cooling ENS 523472016-11-05T08:04:0005 November 2016 08:04:00 10 CFR 50.72(b)(3)(iv)(A), System Actuation Valid Actuation of Rps While Reactor Shutdown ENS 496082013-12-05T08:25:0005 December 2013 08:25:00 10 CFR 50.72(b)(2)(iv)(B), RPS System Actuation, 10 CFR 50.72(b)(3)(iv)(A), System Actuation Automatic Reactor Scram Following Turbine Trip on High Moisture Separator Level ENS 491082013-06-12T17:33:00012 June 2013 17:33:00 10 CFR 50.72(b)(2)(iv)(B), RPS System Actuation, 10 CFR 50.72(b)(3)(iv)(A), System Actuation Circulating Water Pump Trip Leads to Reactor Scram ENS 450162009-04-23T13:10:00023 April 2009 13:10:00 10 CFR 50.72(b)(3)(iv)(A), System Actuation Actuation of Auto Load Sequencer During Fast Bus Transfer Testing ENS 437532007-10-29T02:03:00029 October 2007 02:03:00 10 CFR 50.72(b)(3)(iv)(A), System Actuation Refuel Floor Exhaust Hi-Hi Radiation Alarms During Reactor Reassembly ENS 433952007-05-29T12:35:00029 May 2007 12:35:00 10 CFR 50.72(b)(3)(iv)(A), System Actuation, 10 CFR 50.72(b)(2)(iv)(A), System Actuation - ECCS Discharge Manual Reactor Scram Due to Loss of Feed Pumps After Electrical Transient ENS 411102004-10-11T01:53:00011 October 2004 01:53:00 10 CFR 50.72(b)(3)(iv)(A), System Actuation a Rps Actuation Signal Occurred Due to Low Reactor Water Level While in Mode 3 ENS 411092004-10-10T22:14:00010 October 2004 22:14:00 10 CFR 50.72(b)(2)(iv)(B), RPS System Actuation, 10 CFR 50.72(b)(3)(iv)(A), System Actuation, 10 CFR 50.72(b)(2)(iv)(A), System Actuation - ECCS Discharge Manual Reactor Scram Due to a Steam Leak in the Turbine Building ENS 410942004-10-05T17:34:0005 October 2004 17:34:00 10 CFR 50.72(b)(3)(iv)(A), System Actuation Inadvertent Undervoltage Condition Initated Diesel Load Sequencer, Etc. Diesel Did Not Start. ENS 403782003-12-06T04:49:0006 December 2003 04:49:00 10 CFR 50.72(b)(3)(iv)(A), System Actuation a Level 3 Low Reactor Water Level Was Reached During a Reactor Water Level Transient 2019-08-03T23:47:00 | |