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

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

ML20248J811
Person / Time
Site:	South Texas
Issue date:	04/06/1989
From:	Holler E NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION IV)
To:
References
PNO-IV-89-025, PNO-IV-89-25, NUDOCS 8904170070
Download: ML20248J811 (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 hours2.777778e-4 days <br />0.00667 hours <br />3.968254e-5 weeks <br />9.132e-6 months <br />. 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 hours2.314815e-5 days <br />5.555556e-4 hours <br />3.306878e-6 weeks <br />7.61e-7 months <br /> or the plant must be in hot standby (Mode 3) within the next 6 hours6.944444e-5 days <br />0.00167 hours <br />9.920635e-6 weeks <br />2.283e-6 months <br /> and in cold shutdown (Mode 5) within the '

following 30 hours3.472222e-4 days <br />0.00833 hours <br />4.960317e-5 weeks <br />1.1415e-5 months <br />. 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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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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