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Seabrook personnel determined that the Emergency Response Data System (ERDS) is unavailable due to a malfunction of its process computer. The condition occurred around 0430 EDT today after a plant electrical bus was de-energized and subsequently reenergized during a maintenance activity. The plant is presently in a refueling outage with the reactor vessel defueled. Following repair of the process computer, Seabrook expects to return ERDS to service later today. This event is being reported in accordance with 10 CFR50.72(b)(3)(xiii), loss of emergency preparedness capabilities, for loss of the ERDS function. The NRC Resident Inspector has been notified of this event.

• * * UPDATE FROM MIKE TAYLOR TO HOWIE CROUCH AT 1333 EDT ON 10/1/12 * * *

The ERDS system has been returned to service. The licensee will be notifying the NRC Resident Inspector. Notified R1DO (Schmidt).

Seabrook declared an Unusual Event (HU3 - hazard or other conditions affecting plant safety) due to a spill of one gallon of ammonium hydroxide in the stockroom area of the Administration Building. No reports of injured individuals (were received) at this time. No plant or equipment damage occurred. The lower level of the Administration Building is evacuated. Personnel in SCBAs (Self Contained Breathing Apparatus) are mitigating the spill. The Administration Building is in the Protected Area adjacent to the Turbine Building. The licensee notified the NRC Resident Inspector and the State. Notified DHS, FEMA, NICC, DOE, USDA, and HHS.

• * * UPDATE AT 1747 ON 6/13/2012 FROM ED LYONS TO MARK ABRAMOVITZ * * *

At 1343 (EDT) on 6/13/12 an Unusual Event was declared due to a reported Ammonium Hydroxide spill in a storeroom on the first floor of the Administration Building. At 1357 (EDT) the State of NH was notified and at 1401 the State of Massachusetts was notified of the Unusual Event using the State Notification Fact Sheet. The delay to the State of Massachusetts notification was due to issues with the dedicated phone system. At 1422 the NRC was notified of the Unusual Event using the Event Notification Worksheet. This initial notification reported a one gallon spill of Ammonium Hydroxide. Additionally there were no reported injuries and no impact to plant equipment. Further investigation revealed that the spill amount is 1-2 pints out of a 1 gallon container and the initial report of no injuries was validated. The concentration of the Ammonium Hydroxide is 25.5%. The spill was confined to a small area of the store room on the first floor of the Administration Building. The spill had no impact on plant equipment used for normal operation. Initial cleanup by plant personnel is complete and external services have been notified to complete the final spill cleanup. Seabrook Station is terminating the Unusual Event. Seabrook Station will continue to investigate and resolve the issues with the dedicated state notification phone system. Currently we have a troubleshooting team which has verified backup communications via the commercial phone lines is available. The Unusual Event was terminated at 1730 EDT. The licensee notified the NRC Resident Inspector and State. Notified R1DO (Gray), NRR ((Howe), IRD (Grant), DHS, FEMA, NICC, DOE, USDA, and HHS.

At 1129 EDT on 03/28/11, smoke was detected coming from an elevator power supply transformer in the "B" Residual Heat Removal (RHR) vault. The licensee declared a Unusual Event at 1143 EDT. At 1146 EDT the fire brigade responded and found smoke only and no flame. The smoke stopped when the cabinet was de-energized. At 1158 EDT, the fire was proven to be out when the cabinet was opened. No fire fighting extinguishing agents were used. There was no damage to other plant equipment and no personnel injuries. At 1151 EDT, the licensee notified the States of New Hampshire and Massachusetts and at 1209 EDT, activated their Technical Support Center (TSC). The plant was operating at 100% power and remained stable during and after the event. The licensee notified the NRC Resident Inspector.

• * * UPDATE FROM JEFF MCNALLY TO JOHN SHOEMAKER AT 1341 EDT ON 03/28/11 * * *

At 1243 EDT on 03/28/11, the Unusual Event was terminated. Subsequent investigation has revealed that no plant equipment damage beyond a power transformer that supplies an equipment elevator occurred. There was no indication of (visible) flame (smoke only) and no personnel injuries as a result of the event. The licensee notified the NRC Resident Inspector. Notified R1DO (Powell), NRR EO (Cheok), IRD (Morris).

This is an eight hour report per 10 CFR 50.72(b)(3)(viii). Seabrook Station will be implementing a modification to improve reliability of the electrical system serving the Emergency Operations Facility (EOF). Specifically, the existing manual transfer switch between the backup power diesel generator and the EOF building will be replaced with an automatic transfer switch. This work will require that the main power feed to the EOF building be removed for a period of approximately 3 hours today. During this time, a secondary power feed will remain in service which can supply some building loads. A second 3-hour period of 'partial power' may be necessary to complete the job; it is currently anticipated that this second 'partial power' period, if needed, will occur tomorrow, January 28. Power to all EOF loads will be available in between the two 3-hour periods discussed above. In addition, should an emergency be declared during one of the 3-hour periods, full power to the facility can be restored within approximately 2 hours. As a compensatory measure, the TSC will perform the key planning standard functions assigned to the EOF during the two 'partial power' time periods should the EOF be unable to do so; this includes offsite dose projections, development of protective action recommendations and offsite notifications. Emergency plan implementing procedures for the TSC contain the instructions necessary for TSC responders to perform functions. During the 2-day period that this work is being performed, there will be no backup power source for the EOF. All work associated with this switch upgrade will be performed in an expeditious manner consistent with the goal of minimizing EOF unavailability. All EOF responders have been briefed on this work and expected contingent actions. This job will start at approximately 0730 am this morning. We anticipate that all work will be completed by sometime tomorrow afternoon. We will provide a notification update upon completion of the job. The licensee has notified the NRC Resident Inspector.

• * * UPDATE FROM MIKE TAYLOR TO JOE O'HARA AT 1738 ON 01/27/10 * * *

Seabrook station has completed the installation of the automatic transfer switch at the Emergency Operations Facility (EOF). There is no planned work affecting EOF availability. Notified R1DO(Hansell).

On Monday, July 27, 2009, at 0752, Seabrook Station is temporarily relocating its Technical Support Center (TSC) from the permanent location on the 75 foot level of the Control Building (CB) to an alternate location in the Online/Outage Control Center (OCC). This relocation is necessary to allow for installation of new equipment and upgrading of existing equipment in the TSC. The site Emergency Response Organization (ERO) has been notified of the modifications and has been instructed on the planned compensatory measure to be implemented during the temporary relocation. The NRC Resident Inspector has been notified of the relocation activities. This notification is being made in accordance with 10 CFR 50.72(b)(3)(xiii) due to loss of the emergency response facility. Seabrook Station will provide updates as necessary and will advise the NRC of the restoration of the permanent TSC. The State of New Hampshire has been notified.

• * * UPDATE FROM MARK HANSEN TO JOE O'HARA AT 1635 ON 7/30/09 * * *

On Thursday. July 30. 2009. Seabrook Station completed modifications of its Technical Support Center (TSC) and has restored the TSC permanent location on the 75 foot level of the Control Building (CB) to service. The permanent TSC was declared operable at 1456 on Thursday July 30, 2009. The site Emergency Response Organization (ERO) has been notified that the modifications to the permanent TSC have been completed, that compensatory measures are no longer necessary and that TSC personnel are to report to the permanent TSC in the case of a plant emergency. The NRC Resident Inspector has been notified that the permanent TSC has been restored to service. The State of New Hampshire and the Commonwealth of Massachusetts have been notified. Notified R1DO (A. Dimitriadis).

Initiating alarm received was a Turbine Trip. All on site buses 1, 2, 4, 5 and 6 swapped to the Reserve Auxiliary Transformer power supplies. Bus 3 did not swap as expected. The station has entered a Technical Specification 3.8.1.1 (a) 72 hour action statement for offsite power distribution with 345 kV Bus 3 unavailable. All safety systems operated correctly. The station continues to troubleshoot the initiating cause of the Turbine Trip. The plant is stable in Mode 3. During the swap of non safety buses to the Reserve Auxiliary Transformer the Reactor Coolant Pumps (RCP) tripped. Following the loss of power to the RCPs the reactor stabilized in natural circulation. A Pressurizer PORV cycled following the trip. One RCP was restarted to restore forced circulation. Auxiliary Feedwater Pumps started as expected on the trip and were subsequently secured. All control rods fully inserted on the trip. The current decay heat removal path is Start-up Feedwater supplying water to the Steam Generators steaming to the Condenser Steam Dumps. The licensee notified the NRC Resident Inspector.

* * * UPDATE AT 0348 ON 1/20/08 FROM FORREST TO HUFFMAN * * * 

The licensee has indication of a differential voltage fault on the C phase of the 345 kV line that feeds the Unit Auxiliary Transformer and the generator step-up transformers. The licensee also wanted to ensure that the report reflected the specified system actuation of Auxiliary Feedwater.

A licensed employee supervisor had a confirmed positive for alcohol during a random fitness-for-duty test. The employee's access to the plant has been terminated. Contact the Headquarters Operations Officer for additional details. The licensee notified the NRC Resident Inspector.

• * * UPDATE ON 9/20/05 TO CORRECT ERROR * * *

The text should read: A non-licensed employee supervisor had a confirmed positive for alcohol during a random fitness-for-duty test. The employee's access to the plant has been terminated. Contact the Headquarters Operations Officer for additional details. The licensee notified the NRC Resident Inspector.