View source for PNO-V-90-049, on 901207,w/plant Operating at Full Power, Explosion Occurred in Area of B Phase Insulator of Plant Main Transformer,Which Caused Turbine & Reactor Trip.Unusual Event Was Declared Due to Explosion

{{Adams
| number = ML20198K395
| issue date = 12/07/1990
| title = PNO-V-90-049:on 901207,w/plant Operating at Full Power, Explosion Occurred in Area of B Phase Insulator of Plant Main Transformer,Which Caused Turbine & Reactor Trip.Unusual Event Was Declared Due to Explosion
| author name = Richards S
| author affiliation = NRC OFFICE OF INSPECTION &amp; ENFORCEMENT (IE REGION V)
| addressee name = 
| addressee affiliation = 
| docket = 05000397
| license number = 
| contact person = 
| document report number = PNO-V-90-049, PNO-V-90-49, NUDOCS 9710240011
| 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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DEC-10-'90 mot 4 09:05 ID:tt4BB 3306 3314927142 TEL N0:301-492-7142                M370 P02 f) st.< < e    Cnq     f(jr1 j a J .ib     !
MINARY NOTIFICATION OF EVENT OR UNUSUAL OCCURRENCE--PHO-V-90-49                Date 12/07/90 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: WASHINGTON PUBLIC POWER SUPPLY SYSTEM              Emergency Classification WNP-2                                            XX Notification of Unusual Event DOCKET NO. 50-397                                   Alert RICHLAND, WASHINGTON                                Site Area toergency General Emer0ency Not Applicable

==SUBJECT:==
TRANSFORMER EXPLOSION AND REACTOR TRIP At app mximately 10:10 a.m. (PST) on December 7, 1990, with the plant operating at full power, an explosion occurred in the area of the 'B' phase insulator of the plant's main transformer. This caused a turbine trip and a reactor trip. The reactor was stabilized in Mode 3. At 10:19 a.m. (PST), the licensee declared an unusual Event due to the explosion.
Th re was no fire and the Unusual Event was terminated at 11:00 a.m. (PST).
The availability of offsite power was not affected by the event. An inspection conducted of transformers associated with offsite power indicated that the explosion did not impact th3ce transformers.        Preliminary indications are that during the reactor trip, one safety The licensee presently
[ 711ef valve lends      liftedthe to take     forplant about to10  seconds cold        andpending shutdown   then fully  resented.
their review of the event and repair of V transformer.
This information is current as of 11:45 a.m. (PST), December 7,1990.
CONTACT:    S. Richards FTS 463-3063                                                       ,      h           [ p(W
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DISTRTBUTION BY 5520:                                FAX TO:                     E     tO Date_12/07/90 Time 1:15 pm                           Date       Time             C~
Ch:1rman Carr            EDO          RI             INPO                               a Comm. Roberts            AE00        RII             NSAC                               8 Comm. Rogers             PA0          RIII           LICENSEE                           -
C Comm. Curtiss            SLITP        RIV            RESIDENT INSPECTOR comm. Remick             NRR                         HQS. OPEP.ATIONS OFFICER       -
                                                                                                 -c OCA                      NMSS                        POR                                 N OGC                      IRM                         MAIL TO:                             F-C" OE                       OIG                         [ICS (Original) j       ACRS                     ASLAP                 DOT:(Trans. Only, Applicable State)
GPA                      RES RV FORM 211 Revised: 8/19/87 A
l i                   9710240011 901207 l                   PDR     18cE PNO-V-90-049           PDR l}}

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