PNO-V-88-002, on 880116,reactor Shutdown Commenced for More than 48 H Due to Alarms on Main Generator Hydrogen Detraining Unit.Caused by Hydrogen Leak Into Stator Cooling Water Sys in Main Generator.Visual & Sonic Insps Performed

PNO-V-88-002:on 880116,reactor Shutdown Commenced for More than 48 H Due to Alarms on Main Generator Hydrogen Detraining Unit.Caused by Hydrogen Leak Into Stator Cooling Water Sys in Main Generator.Visual & Sonic Insps Performed

ML20148K300
Person / Time
Site:	San Onofre
Issue date:	01/19/1988
From:	Johnson P NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION V)
To:
References
PNO-V-88-002, PNO-V-88-2, NUDOCS 8801270591
Download: ML20148K300 (1)

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PRELIMINARY NOTIFICATION OF EVENT OR UNUSUAL OCCURRENCE--PNO-V-85-02 Date 01/19/88 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 SONGS UNIT 3 Notification of Unusual Event DOCKET N0. 50-362 Alert SAN CLEMENTE, CA Site Area Emergency Ganeral Emergency XX Not Applicable

SUBJECT:

SHUTDOWN FOR GREATER THAN 48 HOURS At 2202 PST on January 16, 1988, Southern California Edison commenced a reactor shutdown as a result of alarms on the main generator hydrogen detraining unit.

The licensee investigated these alarms and found that there was a leak of hydrogen into the stator cooling water system within the main generator.

The licensee removed the four hydrogen coolers from the generator casing to facilitate an inspection. Maintenance personnel have performed visual and sonic inspections and have used a helium detection unit to detemine the source of the hydrogen leakage. However, as of 1200 on January 19, 1988, the leak has not been found. The licensee will continue to inspect the cooling water system and expects to return the plant to service within 48 to 72 hours8.333333e-4 days <br />0.02 hours <br />1.190476e-4 weeks <br />2.7396e-5 months <br /> after the source of the hydrogen leakage can be found and repaired.

The resident inspectors are following the licensee's corrective actions.

This information is current as of January 19, 1988, at 1200 p.m. PST.

CONTACT: P. Johnson FTS 463-3745 DISTRIBUTION BY 5520: FAX TO:

Date Time Da te ,.,m Time a e,,-

Chairman Zech EDO RI -INPO sia.

Com. Roberts AE0D RII -NSAC w Comm. Bernthal PA0 RIII LICENSEE 1'8'-

Comm. Carr SLITP RIV -RESIDENT INSPECTOR 3ai Com. Rogers NRR -HQS. OPERATIONS OFFICER #df SECY NMSS CA ARM MAIL T0:

PDR 01 DCS (Original)

OGC OIA 00T:(Trans. Only, Appilcable State)  ;

ACRS RES GPA  :

RV FORM 211  !

8801270591 880119 Revised: 8/19/87 PDR I&E P NO-V-$$-002 PDR j P I l

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