PNO-I-08-011, Susquehanna, 10/27/08, Alert Declared Due to High Nitrogen Levels in Unit 2 Safety-Related Pump Room
| ML083010588 | |
| Person / Time | |
|---|---|
| Site: | Susquehanna  |
| Issue date: | 10/27/2008 |
| From: | Paul Krohn, Thomas Setzer NRC Region 1 |
| To: | |
| KROHN, PG | |
| References | |
| PNO-I-08-011 | |
| Download: ML083010588 (2) | |
DCS No.: 500038810272008 Date: October 27, 2008 PRELIMINARY NOTIFICATION OF EVENT OR UNUSUAL OCCURRENCE - PNO-I-08-011 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 PPL Susquehanna, LLC _ Notification of Unusual Event Susquehanna, Unit 2 X Alert Berwick, PA Site Area Emergency Docket: 50-388 General Emergency Not Applicable
Subject:
ALERT DECLARED DUE TO HIGH NITROGEN LEVELS IN A UNIT 2 SAFETY-RELATED PUMP ROOM On October 27, 2008 at 12:06 p.m., PPL Susquehanna, LLC declared an Alert at Susquehanna Unit 2 for high nitrogen levels in a Unit 2 Residual Heat Removal (RHR) room. Liquid nitrogen was being used to freeze water in a portion of the essential service water system to allow maintenance work on a section of piping. The high levels of nitrogen resulted in an oxygen deficient atmosphere. Once that condition was detected, the plant workers in the room at the time evacuated. No injuries were reported. Oxygen levels were returned to normal.
There are no offsite impacts as a result of the event. Susquehanna Unit 2 remains at 100 percent power. Unit 1 was not affected and continues to operate at 94 percent power. Safety systems not directly related to the maintenance remained available and were unaffected.
PPL Susquehanna, LLC will exit the Alert following restoration of the piping removed during the maintenance.
The NRC resident inspectors were onsite and responded to the main control room and emergency response facilities. The Agency 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, staffed its Incident Response Center and contacted the Commonwealth of Pennsylvania. The Region I Public Affairs Office issued a press release and has responded to media inquiries.
The information presented herein has been discussed with PPL Susquehanna, LLC and is current as of October 27, at 4:00 p.m.
This preliminary notification is issued for information only, and no further preliminary notification update by the staff is anticipated.
ADAMS Accession Number: ML083010588 Contacts: P. Krohn T. Setzer (610) 337-5120 (610) 337-5165 Paul.krohn@nrc.gov Thomas.setzer@nrc.gov
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Chairman Klein Comm. Jaczko Comm. Lyons Comm. Svinicki OIP OCA OGC EDO OE NRR NMSS OIG RES ACRS FSME NRO NSIR OPA SECY Regional Offices BY FAX:
DOT:Trans INPO NSAC RI Resident Office Licensee: PPL Susquehanna, LLC Susquehanna 2 Nuclear Power Plant SUNSI Review Complete: LD (Reviewers Initials)
ML0830105888 DOCUMENT NAME: G:\DRP\PNs\PNO-I-08-011 Susquehanna.doc 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/DRS RI/POA RI/ORA RI/DRS NAME LDoerflein/LD DScrenci/DS MMcLaughlin/DMJ for MGamberoni/MG DATE 10/27/08 10/27/08 10/27/08 10/27/08 OFFICIAL RECORD COPY Region I Form 83 (Rev. July 2, 2003)