View source for PNO-II-86-057, on 860809,while Unit in Hot Standby,Reactor Coolant Pumps Experienced Seal Failure.Leak Initially Estimated at 60 Gpm But Decreased to 30 Gpm After Affected Pump Tripped.Unit Shut Down to Repair Pump Seals

{{Adams
| number = ML20214K317
| issue date = 08/12/1986
| title = PNO-II-86-057:on 860809,while Unit in Hot Standby,Reactor Coolant Pumps Experienced Seal Failure.Leak Initially Estimated at 60 Gpm But Decreased to 30 Gpm After Affected Pump Tripped.Unit Shut Down to Repair Pump Seals
| author name = Brownlee V, Peebles T
| author affiliation = NRC OFFICE OF INSPECTION &amp; ENFORCEMENT (IE REGION II)
| addressee name = 
| addressee affiliation = 
| docket = 05000413
| license number = 
| contact person = 
| document report number = PNO-II-86-057, PNO-II-86-57, NUDOCS 8608210030
| document type = PRELIMINARY NOTIFICATION OF EVENT OR OCCURRENCE (PNO,, TEXT-INSPECTION &amp; AUDIT &amp; I&amp;E CIRCULARS
| page count = 1
}}
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August 12, 1986 PRELIMINARY NOTIFICATION OF EVENT OR UNUSUAL OCCURRENCE PN0-II-86-57 This preliminary notification constitutes EARLY notice of events of POSSIBLE safety or public interest significance. The information is as initially received without verifi-cation or evaluation, and is basically all that is known by the Region II staff on this dat2.
FACILITY: Duke Power Company                        Licensee Emergency Classification:
Catawba Unit 1                                Notification of Unusual Event Docket No. 50-413                         X Alert Rock Hill, South Carolina                     Site Area Emergency General Emergency Not Applicable

==SUBJECT:==
REACTOR COOLANT PUMP SEAL LEAK One of the unit's reactor coolant pumps experienced a seal failure between 7:15 and 7:20 a.m. (EDT) on Saturday, August 9, while the unit was in hot standby. The resulting leak was initially estimated at 60 gallons per minute (gpm), which decreased to about 30 gpm after the affected pump was immediately tripped.      Subsequent calculations indicated that 43 gpm was the maximum leak rate.
Because the leak at first appeared to exceed 50 gpm, Duke declared an alert at 8:14 a.m.,
in accordance with the plant emergency plan, but lowered this designation to an unusual event 21 minutes later after the leak rate decreased. Neither the leaking coolant nor any radioactive gases was released to the atmosphere. By 7 a.m. on Sunday, August 10, the leak rate had dropped to 8 gpm, and the unusual event was terminated.
The unit is expected to be shut down for 14 days to repair the pump seals and then will b: gin a refueling outage.
Duke and the NRC have responded to media inquiries.
The State of South Carolina has been informed.
This information is current as of 8 a.m. today.

==Contact:==
T. Peebles, 242-4198                     V. L. Brownlee, 242-5583 DISTRIBUTION:
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