PNO-II-93-052, on 930930,plant Commenced Unit Shutdown from 100% Power Due to RCS Leakage Through Pressurizer Manway Flange.Unit Currently in Mode 3 at Normal Operating Temp & Pressure
| ML20057E309 | |
| Person / Time | |
|---|---|
| Site: | Turkey Point  |
| Issue date: | 10/01/1993 |
| From: | Landis K NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II) |
| To: | |
| References | |
| PNO-II-93-052, PNO-II-93-52, NUDOCS 9310120007 | |
| Download: ML20057E309 (1) | |
) October 1,
1993 PRELIMINARY NOTIFICATION OF EVENT OR UNUSUAL OCCURRENCE PNO-II-93-052 This preliminary notification constitutes EARLY notice of events of POSSIBLE safety or public interest significance. The information is as initially recaived without verification or evaluation, and is basically all that is known by the Region II staff on this date.
FCcility Licensee Emergency Classification Florida Power & Light Co.
Notification of Unusual Event Turkey Point 3 Alert Miami, Florida Site Area Emergency Dockets: 50-250 General Emergency X Not Applicable
Subject:
TURKEY POINT UNIT 3 SHUTDOWN DUE TO REACTOR COOLANT SYSTEM (RCS)
LEAKAGE Turkey Point Unit 3 commenced a unit shutdown from 100 % power at approximately 7:42 p.m.
on September 30, 1993, due to RCS leakage through the pressurizer manway flange. The RCS leak rate on the unit had been trending up with the latest leakrate calculations showing leak rates of approximately.79 Gallons Per Minute (GPM). The technical specification limit is 1.0 GPM unidentified. Several containment entries were made on September 30 to identify the source. A major leak source from the pressurizer manway was identified, and management decided to voluntarily shutdown the unit to repair the manway as well as identify any other possible sources of RCS leaks. Additional inspections identified only minor valve packing leaks.
During the shutdown, at approximately 10: 05 p.m. on September 30, Unit 3 experienced an automatic reactor trip signal while sub-critical.
This occurred when one of the two (Channel N31) source range detectors failed high upon automatically energizing. Post trip response was normal.
Licensee troubleshooting activities are ongoing.
The unit is currently in Mode 3 (hot standby) at normal operating temperature and pressure. Once primary degassing is completed, the licensee intends to proceed to cold shutdown for a forced outage of about six days.
The outage will include any necessary repair of the pressurizer and manway seating surface and gasket replacement. Unit 4 remains at 100% power.
The resident inspectors performed a containment entry and inspection, observed portions of the shutdown, monitored unit post-trip response, and are reviewing outage activities.
The State of Florida was informed by the NRC.
The NRC received initial notification of this event by telephone from the Senior Resident Inspector at approximately 7:00 p.m.
(EDT) on September 30, 1993.
This information is current as of 9:00 a.m.
on October 1, 1993.
Contact:
KERRY D.
LANDIS l
(404)331,-55,09 h}
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