PNO-V-89-028, on 890512,primary-to-secondary Leak Rate of 117 Gallons Per Day Occurred.On 890513,steam Generator Blowdown Radiation Monitor Indication Increased One Decade.Reactor Shut Down & mid-loop Will Be Drained to Repair Leaking Tube
| ML13302B717 | |
| Person / Time | |
|---|---|
| Site: | San Onofre  |
| Issue date: | 05/15/1989 |
| From: | Andrew Hon, Johnson P NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION V) |
| To: | |
| References | |
| PNO-V-89-028, PNO-V-89-28, NUDOCS 8905230079 | |
| Download: ML13302B717 (2) | |
ACCELERATED D]1jBUTION DEMONSTRAjON SYSTEM REGULATORY INFORMATION DISTRIBUTION SYSTEM (RIDS)
ACCESSION NBR:8905230079 DOC.DATE: 89/05/15 NOTARIZED: NO DOCKET #
FACIL:50-361 San Onofre Nuclear Station, Unit 2, Southern Californ 05000361 AUTH.NAME AUTHOR AFFILIATION JOHNSON,P.
Region 5, Ofc of the Director HON,A.
Region 5, Ofc of the Director RECIP.NAME RECIPIENT AFFILIATION IR
SUBJECT:
PNO-V-89-028:on 890512,shutdown to repair steam generator tube leak.
DISTRIBUTION CODE: IE34D COPIES RECEIVED:LTR 0 ENCL SIZE:
D TITLE: Preliminary Notification-Occurrence/Non-Routine Event/Safeguards Even S NOTES:
RECIPIENT COPIES RECIPIENT COPIES ID CODE/NAME LTTR ENCL ID CODE/NAME LTTR ENCL INTERNAL: ACRS/SIESS 1
AEOD/DSP/TPAB 1
NRC OP CNTR 1
NRR/DRIS/SGB 9A 1
NRR/DRIS/SIB 9A 1
NRR/DRIS/VIB 1
NRR/PMAS/ILRB12 1
'NUpOOS-A-BSTRACT 1
OE DIR 1
REG 02 1
RES BROOKS,B 1
S DEPY 1
RES FILE 1
RES/DE 1
RES/DRA 1
RES/DSIR 1
RES/DSIR/EIB 1
RES/DSR DEPY 1
RES/PMPDAS 1
RGN5 FILE 01 1
EXTERNAL: DOE BARBER EV34 1
LPDR 1
NRC PDR 1
NSIC 1
NOTE 'PO ALL "RIDs" RECIP-rIETIs:
5 PLEA SE H=L US TO REDUCE WASTE CDRtACT THE DOC11MDIT CDNTrROL DESK,,
RCX)M P1-37 (EXT1. 20079) TO ELIN2ATE YOUR NAME FREE DISTRIBUTION ISTS FOR DCX'UENTS YOU DCN'T NEED!
TOTAL NUMBER OF COPIES REOUIRED: LTTR 4~ENCL 24
PRELIMINARY NOTIFICATION OF EVENT OR UNUSUAL OCCURRENCE--PNO-V-89-28 Date:
5/15/89 This preliminary notification constitutes EARLY notice of events of POSSIBLE safety or public interest significance. The information presented is as initially received without verification or evaluation and is basically all that is known by Region V staff on this date.
FACILITY: SOUTHERN CALIFORNIA EDISON Emergency Classification San Onofre Unit 2 Notification of Unusual Event Docket No. 50-361 Alert San Clemente, California Site Area Emergency General Emergency X Not Applicable
SUBJECT:
SHUTDOWN TO REPAIR STEAM GENERATOR TUBE LEAK Routine steam generator chemistry samples on Unit 2 Steam Generator E088 gave indi ations on May 12, 1989 of a primary-to-secondary leak rate of 117 gallons per day (this followed leakage measurements of 6 and 80 gpd on May 10 and 11, respectively).
At 12:50 a.m. (PDT) on May 13, while continuing to monitor tube leakage with the unit at 100% power, operators observed Steam Generator E088 blowdown radiation monitor indication to increase by approximately one decade. The Shift Superin tendent initiated a power reduction to 80% and directed another chemistry analysis for leak rate determination.
This sample indicated approximately 540 gpd primary to-secondary leakage (the Technical Specifications limit on steam generator tube leakage is 720 gallons per day).
The power reduction continued, and another sample at 2:25 a.m. indicated approximately 700 gpd leakage. The licensee completed the shutdown, with the unit entering Mode 3 at 6:36 a.m. on May 13.
Indicated leakage decreased significantly after shutdown (apparently due to leak closure or to analysis inaccuracy as a result of transient conditions).
The licensee cooled down the unit to Mode 5 on May 14 and is making preparations to drain to mid-loop in order to identify and repair the leaking tube.
The outage is expected to last approximately 21 days.
The resident inspectors and Region V are following the licensee's outage plans, including preparations for draining to mid-loop.
This information is current as of 10:00 a.m. PDT on May 15, 1989.
CONTACT:
P. Johnson A. Hon FTS 463-3745 (714) 492-2641 DISTRIBUTION BY 5520:
FAX TO:
Date
/; I Time
- 1 Date Time Chairman Zech EDO RI INPO Comm. Roberts AEOD RII NSAC Comm. Carr PAO RIII LICENSEE Comm. Rogers SLITP RIV RESIDENT INSPECTOR Comm. Curtiss NRR HQS. OPERATIONS OFFICER SECY NMSS PDR (202)634-3343 CA ARM MAIL TO
(r iginal)
OE OIA DOT:(Trars. Only, Applicable State)
("k.
5