PNO-IV-88-051, failure of Westinghouse DS-416 Electrical Breakers.Failures Could Be Generic Problem.Westinghouse Representatives on Site Observing Testing,Insp & Installation of Subj Breakers: Difference between revisions

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    . , *      'h June 16, 1988 PRELIMIN/.,R,v r      "ATION OF EVENT OR UNUSUAL OCCURRENCE -- PN0-IV-88-51 This prelih.                'ication constitutes EARLY notice of events of POSSIBLE safety er pu              . rest significance. The information is as initially received without ver1.    .
i or evaluation, and is basically all that is known by the Region IV stc.. c.i this date.
FACILITY: South Texas Project                                                              Licensee Emergency Classification:
Houston Lighting & Power                                                              Notification of Unusual Event Alert Site Area Emergency Earieral Emergency X Not Applicable
 
==SUBJECT:==
FAILURE OF WESTIhGH0VSE 416 ELECTRICAL BREAKERS The licensee has inspected and tested 28 safety-related Westinghouse electrical I          breakers, type DS-416, in Unit 1 and found that 2 failed due to burned out I
closing coils and 7 others had mechanical binding problems. The licensee inspected and tested 18 breakers in Unit 2 and found 3 with mechanical binding problems. The problems identified affect the shutting action of the breakers only. All the breakers tested are required to shut after a loss of offsite power. Westinghouse representatives are on site at STP observing the testing, inspection, and installation of the DS 416 breakers. These failures of DS 416 electrical breakers could be a generic problem.
In a related matter, the licensee was testing the breaker associated with the Train "B" of the Essential Cooling Water (ECW) pump. The breaker failed to close. Train "C" of the ECW was out of service due to a pump seal failure.
The licensee replaced the failed breaker in Train "B" with the operable breaker in Train "C". The plant is now in a 72 hour action statement.
Region IV and NRR, are following the licensee's actions and plant status.
Neither the licensee nor the NRC plans to issue a press release.
CONTACT:    DoyleHunnicutt(FTS 728-8137) l l
IV:DRP/PS:D            D:DRh                                                  RA unnicutt;dp          LJCallan                                              RDMartin                                        i
                /W/88                Q /[(,/88                                            p //6/88
                                                                                                                                          *\
62    28 880616 PNO-IV-88-051 DCD
 
<                                                                            1
  . ., a >
DISTRIBUTION:
H. St.          MNBB 0WF                MAIL:  DCS (Original IE 34)
Chairman Zech    %EDU IDU                UOT-(Trans only)
Comm. Roberts    01A  OGC Comm. Carr      NL    PA                FAX '. INP0 Comm. Rogers    RES  01                        NSAC SECY                  NMSS                      RRI CA                    NRR                        NRC OC PDR                  SLITP                      LICENSEE (ReactorLic.)
OGC-H GPA ACRS                  5520: 5 //0/88 0 c7//o REGIONS L HQ l
l I}}


{{PNO-Nav|region=IV}}
{{PNO-Nav|region=IV}}

Latest revision as of 19:22, 16 December 2020

PNO-IV-88-051:failure of Westinghouse DS-416 Electrical Breakers.Failures Could Be Generic Problem.Westinghouse Representatives on Site Observing Testing,Insp & Installation of Subj Breakers
ML20195D464
Person / Time
Site: South Texas  STP Nuclear Operating Company icon.png
Issue date: 06/16/1988
From: Hunnicutt D
NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION IV)
To:
References
PNO-IV-88-051, PNO-IV-88-51, NUDOCS 8806230128
Download: ML20195D464 (2)
v • d • e


, _ _ _ - - _ - - -

. , * 'h June 16, 1988 PRELIMIN/.,R,v r "ATION OF EVENT OR UNUSUAL OCCURRENCE -- PN0-IV-88-51 This prelih. 'ication constitutes EARLY notice of events of POSSIBLE safety er pu . rest significance. The information is as initially received without ver1. .

i or evaluation, and is basically all that is known by the Region IV stc.. c.i this date.

FACILITY: South Texas Project Licensee Emergency Classification:

Houston Lighting & Power Notification of Unusual Event Alert Site Area Emergency Earieral Emergency X Not Applicable

SUBJECT:

FAILURE OF WESTIhGH0VSE 416 ELECTRICAL BREAKERS The licensee has inspected and tested 28 safety-related Westinghouse electrical I breakers, type DS-416, in Unit 1 and found that 2 failed due to burned out I

closing coils and 7 others had mechanical binding problems. The licensee inspected and tested 18 breakers in Unit 2 and found 3 with mechanical binding problems. The problems identified affect the shutting action of the breakers only. All the breakers tested are required to shut after a loss of offsite power. Westinghouse representatives are on site at STP observing the testing, inspection, and installation of the DS 416 breakers. These failures of DS 416 electrical breakers could be a generic problem.

In a related matter, the licensee was testing the breaker associated with the Train "B" of the Essential Cooling Water (ECW) pump. The breaker failed to close. Train "C" of the ECW was out of service due to a pump seal failure.

The licensee replaced the failed breaker in Train "B" with the operable breaker in Train "C". The plant is now in a 72 hour8.333333e-4 days <br />0.02 hours <br />1.190476e-4 weeks <br />2.7396e-5 months <br /> action statement.

Region IV and NRR, are following the licensee's actions and plant status.

Neither the licensee nor the NRC plans to issue a press release.

CONTACT: DoyleHunnicutt(FTS 728-8137) l l

IV:DRP/PS:D D:DRh RA unnicutt;dp LJCallan RDMartin i

/W/88 Q /[(,/88 p //6/88

  • \

62 28 880616 PNO-IV-88-051 DCD

< 1

. ., a >

DISTRIBUTION:

H. St. MNBB 0WF MAIL: DCS (Original IE 34)

Chairman Zech %EDU IDU UOT-(Trans only)

Comm. Roberts 01A OGC Comm. Carr NL PA FAX '. INP0 Comm. Rogers RES 01 NSAC SECY NMSS RRI CA NRR NRC OC PDR SLITP LICENSEE (ReactorLic.)

OGC-H GPA ACRS 5520: 5 //0/88 0 c7//o REGIONS L HQ l

l I

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