PNO-I-10-005, Susquehanna Alert Due to High Refrigerant Levels in Unit 1 Reactor Bldg
| ML102220536 | |
| Person / Time | |
|---|---|
| Site: | Susquehanna  |
| Issue date: | 08/10/2010 |
| From: | Christopher Cahill, Paul Krohn NRC Region 1 |
| To: | |
| KROHN P, RI/DRP/PB4/610-337-5120 | |
| References | |
| PNO-I-10-005 | |
| Download: ML102220536 (2) | |
DCS No.: 0500038708102010 Date: August 10, 2010 PRELIMINARY NOTIFICATION OF EVENT OR UNUSUAL OCCURRENCE - PNO-I-10-005 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 1 X Alert Berwick, PA Site Area Emergency Docket: 50-387 General Emergency Not Applicable
Subject:
ALERT DECLARED DUE TO HIGH REFRIGERANT LEVELS IN THE UNIT 1 REACTOR BUILDING On August 10, 2010 at 09:22 a.m., PPL Susquehanna, LLC, declared an Alert at Susquehanna Unit 1 for high refrigerant levels (FREON) in the Unit 1 reactor building, a vital area. The refrigerant was leaking from the 1A reactor building chiller. The licensee is still investigating the cause of the leak. The high levels of refrigerant resulted in the potential for an oxygen-deficient atmosphere and had the potential to impact access to vital areas of the facility. Once that condition was detected, the plant workers in the reactor building were evacuated as a precaution to ensure personnel safety. No injuries were reported. The 1B reactor building chiller is operating normally to provide cooling while the 1A reactor building chiller is out-of-service.
There are no radiological off-site impacts as a result of the event. Susquehanna Unit 1 remains at rated power. Unit 2 was not affected and continues to operate at rated power. Safety systems in the reactor building are not affected by the leak.
PPL Susquehanna, LLC, will exit the Alert following termination of or mitigation of the leak, restoration of normal atmospheric conditions in, and access to the reactor building.
The NRC Resident Inspectors were on-site 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 August 10 at 12:00 p.m.
This preliminary notification is issued for information only, and no further preliminary notification update by the staff is anticipated.
ADAMS Accession Number: ML102220536 Contacts: P. Krohn C. Cahill (610) 337-5120 (610) 337-5108 Paul.krohn@nrc.gov Christopher.cahill@nrc.gov
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OWFN TWFN Chairman Jaczko NMSS Comm. Svinicki OIG Comm. Apostolakis RES Comm. Magwood Comm. Ostendorff OIP OCA OGC EDO OE NRR SECY Regional Offices BY FAX:
DOT:Trans INPO NSAC RI Resident Office Licensee: PPL Susquehanna, LLC SUNSI Review Complete: CGC (Reviewers Initials)
DOCUMENT NAME: G:\DRP\PNs\PNO-I-10-005 - Susquehanna Unit 1 Alert due to high refrigerant levels in reactor bldg.docx 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 PKrohn/PGK NSheehan/NAS NMcNamara/NTM JClifford/JWC DATE 8/10/10 08/10/10 08/10/10 08/10/10 OFFICIAL RECORD COPY Region I Form 83 (Rev. July 2, 2003)