PNO-I-07-009, Nine Mile Point Unit 2, Alert Declared Due to Inadvertent Discharge of Carbon Dioxide Into Electrical Switchgear Room
| ML072630089 | |
| Person / Time | |
|---|---|
| Site: | Nine Mile Point  |
| Issue date: | 09/20/2007 |
| From: | Brice Bickett, Glenn Dentel NRC Region 1 |
| To: | |
| Dentel, G RGN-I/DRP/BR1/610-337-5233 | |
| References | |
| PNO-I-07-009 | |
| Download: ML072630089 (2) | |
DCS No.: 05000410092007 Date: September 20, 2007 PRELIMINARY NOTIFICATION OF EVENT OR UNUSUAL OCCURRENCE - PNO-I-07-009 This preliminary notification constitutes EARLY notice of events of POSSIBLE safety or public interest significance. The information is as initially received without verification or evaluation, and is basically all that is known by the Region I staff on this date.
Facility Licensee Emergency Classification Constellation Energy _ Notification of Unusual Event Nine Mile Point Nuclear Power Station X Alert Unit 2 Site Area Emergency Scriba, NY General Emergency Docket: 50-410 Not Applicable
Subject:
ALERT DECLARED DUE TO INADVERTENT DISCHARGE OF CARBON DIOXIDE INTO NINE MILE POINT UNIT 2 ELECTRICAL SWITCHGEAR ROOM On September 19, 2007, at 3:04 p.m., Constellation Energy declared an Alert at Nine Mile Point Unit 2 after a fire suppression system inadvertently discharged carbon dioxide into a safety-related switchgear room. Since the concentrations of carbon dioxide and oxygen were not known, an Alert was declared due to the potential for a hazardous atmosphere to exist. No personnel were in the switchgear room at the time of the inadvertent actuation, and there were no personnel injuries reported. There also was no fire. Safety-related systems were unaffected by the event and remained available. Nine Mile Point Unit 2 remained at 100 percent power throughout the event.
At 9:47 p.m., Constellation Energy exited the Alert after verifying the switchgear room was safe for personnel access.
The NRC resident inspectors were onsite and responded to the main control room and emergency response facilities, and NRC Region I entered the monitoring mode of incident response, to follow the licensees actions and evaluate plant safety performance. NRC Region I, in King of Prussia, PA, contacted the New York State Emergency Management Office, and the Region I Public Affairs Office is prepared to respond to media inquiries.
The information presented herein has been discussed with Constellation Energy and is current as of September 20, at 7:00 a.m.
This preliminary notification is issued for information only, and no further preliminary notification update by the staff is anticipated.
ADAMS Accession Number: ML072630089 Contacts: G. Dentel B. Bickett (610) 337-5233 (610) 337-6959 gtd@nrc.gov bab4@nrc.gov
DISTRIBUTIONS:
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OWFN TWFN Chairman Klein NMSS Comm. Jaczko OIG Comm. Lyons RES OIP OCA OGC EDO OE NRR SECY Regional Offices BY FAX:
DOT:Trans INPO NSAC RI Resident Office Licensee: Constellation Energy Nine Mile Point Nuclear Power Station SUNSI Review Complete: GTD1 (Reviewers Initials)
DOCUMENT NAME: C:\FileNet\ML072630089.wpd After declaring this document An Official Agency Record it will be released to the Public.
To receive a copy of this document, indicate in the box: "C" = Copy without attachment/enclosure "E" = Copy with attachment/enclosure "N" = No copy OFFICE RI/DRP RI/POA RI/ORA RI/DRP NAME GDentel DScrenci NMcNamara DLew DATE 09/19/07 09/19/07 09/19/07 09/19/07 OFFICIAL RECORD COPY Region I Form 83 (Rev. July 2, 2003)