View source for PNO-V-87-055, on 870729,unusual Event Declared Due to Loss of Emergency Power Supplies Due to Jacket Water Leak in Engine Driven Jacket Water Pump.Licensee Maintaining Six Operable Offsite Power Transmission Lines

{{Adams
| number = ML20236H941
| issue date = 07/30/1987
| title = PNO-V-87-055:on 870729,unusual Event Declared Due to Loss of Emergency Power Supplies Due to Jacket Water Leak in Engine Driven Jacket Water Pump.Licensee Maintaining Six Operable Offsite Power Transmission Lines
| author name = Ang W
| author affiliation = NRC OFFICE OF INSPECTION &amp; ENFORCEMENT (IE REGION V)
| addressee name = 
| addressee affiliation = 
| docket = 05000312
| license number = 
| contact person = 
| document report number = PNO-V-87-055, PNO-V-87-55, NUDOCS 8708050408
| document type = PRELIMINARY NOTIFICATION OF EVENT OR OCCURRENCE (PNO,, TEXT-INSPECTION &amp; AUDIT &amp; I&amp;E CIRCULARS
| page count = 1
}}
{{#Wiki_filter:- _ _ _ _ _ .          --                                                                   .
f        f()J ll k   i PRELIMINARY NOTIFICATION OF EVENT OR UNUSUAL OCCURRENCE--PNO-RV-87-55 Date: July 30, 1987                      ;
1 This preliminary notification constitutes EARLY notice of events of POSSIBLE safety or                        l 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:          Sacramento Municipal Utility District          Emergency Classification                     j Rancho Seco                                    - -
X Notification of Unusual Event           i Docket No. 50-312                                    A lert                                 j Site Area Emergency                     '
General Emergency Not Applicable

==SUBJECT:==
LOSS OF EMERGENCY POWER SUPPLY With the plant in cold shutdown since December 26, 1985, the licensee experienced a loss of the onsite emergency power supply. The normal offsite power has not been interrupted and continues to supply all plant loads. Decay heat continues to be removed by the Decay Heat Removal system.                                                                     ;
At approximately 8:00 p.m., PDT, on July 29, 1987, the licensee attempted to perform l
the normal monthly surveillance procedure on the 'A' diesel generator. 'B' diesel is down for preventive maintenance. During the performance of the surveillance procedure,                        l the licensee discovered a jacket water leak in the engine driven jacket water pump. The licensee declared an Unusual Event (UE) due to a loss of emergency power supplies.
l The licensee has taken compensatory measures which include maintaining six operable offsite power transmission lines and two operable startup transformers. The licensee is taking hourly readings of transmission line and transformer data. The licensee expects to have the 'A' diesel repaired by mid-day July 30, 1987. Resident inspectors are monitoring licensee efforts.
The licensee has notified local media.
This information is current as of 9:00 a.m., PDT, on July 30, 1987.
CONTACT:          W. P. Ang, RV FTS 463-3726 DISTRIBUTION H St.                       MNBB      Phillips # 30E/W    Willste          Air Rights #2##3 Mail:
Chairisin Zech               EDO       NRR           IE     NMSS                             ADM:DMB COMM. Roberts                PA                      OIA    RES                       D0T:Trans Only Comm. Asselstine             MPA                     AE0D                                                    ;
Comm. Bernthal               0GC                                                                             i Comm. Carr                   Regions:
SECY                                   INPO /2.:.4 NSAC 12-M ACRS                                   Licensee: Vt;2 2 -
CA                                     (Reactor Licensees).            REGION V: FORM 211 PDR                                    Resident Inspector /J.!'//            (Revised 3/14/83) i                                        Headquarters Operations Officer /211f 8708050'408 870730                                        '/        p PDR   I EcE PNO-V-87-055       PDR                                  }~              ~            /b}}

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