View source for PNO-IV-98-041, on 980918,control Room Operators Observed Alarm on One Channel of Main Condenser Steam Jet Air Ejector Radiation Monitoring Equipment,Which Indicated That Activity of Condenser Exhaust Had Increased by About Two Decades

{{Adams
| number = ML20151Z480
| issue date = 09/18/1998
| title = PNO-IV-98-041:on 980918,control Room Operators Observed Alarm on One Channel of Main Condenser Steam Jet Air Ejector Radiation Monitoring Equipment,Which Indicated That Activity of Condenser Exhaust Had Increased by About Two Decades
| author name = Kirsch D, Sloan J
| author affiliation = NRC OFFICE OF INSPECTION &amp; ENFORCEMENT (IE REGION IV)
| addressee name = 
| addressee affiliation = 
| docket = 05000361
| license number = 
| contact person = 
| document report number = PNO-IV-98-041, PNO-IV-98-41, NUDOCS 9809210351
| 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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                                                 . September 18,1998 PRELIMINARY NOTIFICATION OF EVENT OR UNUSUAL OCCURRENCE PNO-IV-98-041 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 Region IV staff in Arlington, Texas on this date.
Facility                            Licensee Emeroency Classification Southem California Edison & San Diego Gas Notification of Unusual Event
          & Electric Co.                           Alert San Onofre 2                               Site Area Emergency San Clemente,Califomia                        General Emergency
        ; Dockets: 50-361                            X Not Applicable

==Subject:==
PLANT SHUTDOWN GREATER THAN 72 HOURS DUE TO STEAM GENERATOR TUBE LEAKAGE On Se,ntember 18,1998, at about 10:05 a.m. (PDT), control room operators observed an alarm on one channel of the main condenser steam jet air ejector radiation monitoring equipment, which indicated that the activity of the condenser exhaust had increased by about two decades above what had been read previously. The other channel had not alarmed yet. The alarm setpoints were set to alarm when steam generator leakage was about 30 gallons per day (gpd). The senior resident inspector responded to the control room to monitor and assess the situation. At about 10:47 a.m. the licensee conservatively determined that the leakage from Steam Generator E088 was about 400 gpd and initiated a power rampdown at 10:34 a.m. Unit 2 was tripped from 35 percent power at about 11:16 a.m. The licensee estimated the leak rate after shutdown to be about 80 to 90 gpd.
The licensee plans to cooldown the plant and conduct the necessary inspections to find and repair the leak.
There has been some media interest in the plant shutdown. The licensee is issuing a press release.
The state of Califomia has been notified. OEDO, NRR and OPA have been notified.
Region IV received notification of this occurrence from the resident inspectors on
: September 18.
        . This information has been discussed with the licensee and is current as of 11:45 a.m.
(PDT) .

==Contact:==
Jim Sloan                  Dennis Kirsch (714)492-2641            (925)975-0290 0 P.109 9809210351 990918                 '"-
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