View source for PNO-IV-89-025, on 890406,util Declared Notification of Unusual Event at Facility Due to One Inoperable Diesel Generator.Util Declared Diesel Generator 12 Operable After Replacing Defective Resistor in Governor Control Circuit

{{Adams
| number = ML20248J811
| issue date = 04/06/1989
| title = PNO-IV-89-025:on 890406,util Declared Notification of Unusual Event at Facility Due to One Inoperable Diesel Generator.Util Declared Diesel Generator 12 Operable After Replacing Defective Resistor in Governor Control Circuit
| author name = Holler E
| author affiliation = NRC OFFICE OF INSPECTION &amp; ENFORCEMENT (IE REGION IV)
| addressee name = 
| addressee affiliation = 
| docket = 05000498
| license number = 
| contact person = 
| document report number = PNO-IV-89-025, PNO-IV-89-25, NUDOCS 8904170070
| document type = PRELIMINARY NOTIFICATION OF EVENT OR OCCURRENCE (PNO,, TEXT-INSPECTION &amp; AUDIT &amp; I&amp;E CIRCULARS
| page count = 2
}}
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j[          . -                                                           April 6, 1989 PRELIMINARY NOTIFICATION-0F EVENT OR UNUSUAL OCCURRENCE -- PN0-IV-89-25 This preliminary notificatica 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 the Region IV staff on this date.                                                                                    ;
FACILITY: Houston Lighting & Power Company                             Licensee Emergency Classification:
South Texas Project, Unit 1              X Notification of Unusual Event
                                           -Docket: 50-498                              Alert Site Area Emergency                  ,
General Emergency                    !
Not Applicable

==SUBJECT:==
NOTIFICATION OF UNUSUAL EVENT (N0VE)
At approximately 8:30 a.m. (CDT), April 6,1989, Houston Lighting & Power                                         l Company (HL&P) declared a NOVE at South Texas Project (STP), Unit 1, because of a Technical Specification (TS) Limiting Condition for Operation (LCO) requiring reactor shutdown. Prior to the NOVE, STP, Unit 1, was o                                                         l reactor power with the No.11 ESF diesel generatorinoperable                      (DG) perating   atof94 percent because              j planned maintenance. With one DG inoperable, TS 3.8.1.1 requires testing of the                                 i remaining two DGs within 24 hours. DG No. 13 tested satisfactory. At approximately 5:54 a.m. , DG No.12 failed its required operability test.                                        ,
TS 3.8.1.1 requires that with 2 or 3 of the DGs inoperable, at least 2 DGs must                                 i be restored to operable status within 2 hours or the plant must be in hot standby (Mode 3) within the next 6 hours and in cold shutdown (Mode 5) within the                                      '
following 30 hours. STP, Unit 1, commenced a power reduction at 8:38 a.m.
At approximately' 11i46 a.m. (CDT), with STP, Unit 1, at 40 percent reactor power, the No.11 DG was declared operable after successful completion of its postmaintenance test run. At 7:50 p.m. (CDT), HL&P declared the No. 12 DG operable after replacing a defective resistor in the DG governor control circuit and terminated the NOVE.
Neither the licensee nor the NRC plans to issue a press release.
The state of Texas will be informed.
Region IV received notification of this occurrence by telephone from Region IV inspector onsite at 9 a.m. and from the H00 at 8:35 p.m. Region IV has informed EDO, NRR, and PA.
This information has been confirmed with a licensee representative.
l CONTACT:                       E. J. Holler, FTS 728-8287 4
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                                                                                                                   /g 8904170070 89040A                                                             /    Ok PDR    18cE PNO-IV-89-025 PNV
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Chmn. Zech                   SECY      NMSS      XEDTI      RES              DOT (Transp.Only)
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Conn. Curtiss PA                       SLITP      H-St       PDR ACRS                         ED0       OE         PDR        NSAC RRI NRC Ops Ctr Licensee (Reactor)                i DISTRIBUTION:                                                                                  ]
NRCRES, RESPN                     Research (Paula Dorm)                                        !
NRCRM, AE0D                       AE00 (Patty Wilson)                                          i NRCRM, BROWN                      ARM (Karen Brown)                                            l NRCRMP, 0IADW                     Inspector & Auditor (Displaywriter/PC)
NRCRMP, 0IDW                      Investigations (Displaywriter/PC)                            i 1NRC02, OPAPN                     GPA:Public Affairs (Glady Ordaz)
INRC0304, SLIPN                   GPA: State / Local Indian Tribes Program (Brenda Hill) 1NRC0304, NMSSPN                  Nuclear Material Safety & Safeguards (Pat Graaf) 1NRC0506, NMSSPN                  Nuclear Material Safety & Safeguards (Cathy Jenkins)         i 1F' 708, OEPN                     Enforcement (Betty Summers)                                   ,
INRC1112, NRRPN                   NuclearReactorRegulation(DonnaBerean)                        l 1NRC1516, 0GCPN                   General Counsel (Edna Downs)                                 l INRC1718, ZECHPN                  Chairman (Lois Altoft)
INRC1718, ED0PN                   Executive Director for Operations (Doris Day)                .
1NRC1718, OCAPN                   GPA: Congressional Affairs (Janice Hester)                   }
hRCRI, RIPN                       Region I NRCRII, RIIPN                     Region II NRCRIII RIIIPN                    Region III NRCRTV, RIVPN                     Region IV                                                    ,
NRCRV, RVPN                       Region V 1
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