ML20085L783
| ML20085L783 | |
| Person / Time | |
|---|---|
| Site: | Fort Saint Vrain  |
| Issue date: | 01/31/1975 |
| From: | Swart F PUBLIC SERVICE CO. OF COLORADO |
| To: | Howard E NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION IV) |
| Shared Package | |
| ML20085L781 | List: |
| References | |
| RO-50-267-75-1, NUDOCS 8311020447 | |
| Download: ML20085L783 (9) | |
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. l Mr. E. Morris Howard, Director Nuclear Regulatory Commission Revion IV, Ofc. of Inspection & Enforcement P. O. Box 5039 White Settlement, Texas 76108
Dear Mr. Howard:
REF: Facility Operating License No. DPR-34 Docket No. 50-267 Enclosed please find a copy of Unusual Event Report No. 50-267/75/1, submitted per the requirements of the Technical Specifications.
Very truly yours,
& EM 7rederic E. Swart Superintendent Nuclear Production Fort St. Vrain Nuclear Generating Station FES:11 cc:
Mr. Angelo Giambusco 1'513 8311020447 750304 ppR ADDCK 05000267 S
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s REPORT DATE: January 28, 1975 UNUSUAL EVENT 4
OCCURRENCE DATE: January 17, 1975 l
FORT ST. VRAIN NUCLEAR CENERATING STATION PUBLIC SERVICE COMPANY OF COLORADO P. O. BOX 361 PLATTEVILLE, COLORADO 80651 I
-REPORT NO. 50-267/75/1 r
Preliminary IDENTIFICATION OF OCCURRENCE:
l An electrical inspection of the main control board and auxiliary electrical I
equipment room revealed discrepancies in maintaining loop and bus segregation l
requirements according to Specification 1-N-2, Supplement.
The segregation l
-violations are the accumulated results of modifications and revisions to the
-essential circuits since the initial audit involving singic failure criteria.
L
' CONDITIONS PRIOR g
lu 6CcGAREhCt.:
Steady-6 tate Power Routine Shutdown
-Hot Shutdown Routine Load Change X
Cold Shutdown Other. (specify) i Refueling Shutdown Routine Startup The major plant parameters at the time of the event were as follows:
Power RTR 0
MWth Elect.
O MWe
': Secondary Coolant Pressure O
psig
' Temperature 0
- F 71ow 0
f/hr.
Pri:.'ary Coolant Pressure 0
psig Temperature
~100
- F Core Inlet 100
- F Core Outlet
> Flow 0
f/hr.
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e DESCRIPTION OF OCCURRENCE-Some of the' colored insulated wires used in the electrical installation Work to denote non-interruptible Bus 1 and Bus 2 circuits and also some of the hand switches and relays used in essential circuits were not separated by the minimum distance to maintain segregation requirements.
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APPAEENT CAUSE OF OCCURRENCE:
Design Unusual Service Cond.
Including Environ.
Manufacture Component Failre X
Installation /Const.
Other (specify) "
Operator Procedure ANALYSIS OF OCCURRENCE:
Wiring and schematic diagrams and the work sheets used during an original electrical audit were reviewed to ensure'that any modifications or
-revisions to essential circuits did not violate segregation requirements.
Ali discrepancies found were referred to the general contractor for review and correction.
CORRECTIVE ACTION:
All colored insulated wires used in essential circuits that do not meet segre-gation requirements will be zipper tubed or changed to high tedperature insulated wires. Hand switches and relays used in essential circuits that do not meet segregation requirements will be separated by asbestos barrier boards.
An inspection will be performed by Public Service Company to ensure that all electrical installation work is correct and meets segregation criteria.
FAILURE DATA /
SIMILIAR REPORTLS OCCURRENCES:
NONE t
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PROGRAMMATIC IMPACT:
NONE
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CODE IMPACT:
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APPROVED:
f 1 mes ReacTe
[ Supt.NuclearProduction
,1 rederic E. Swart ite Engineer Fort St. Vrain Nuclear Fort St. VrainNuclear Generating Station Generating Station I
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Director eu!1]M -
ERDA - SCRPO P. O. Box 1446 Canoga Park, California 91304 REF: Facility Operating.Lic'ense No. DPR-34 Docket No. 50-267
Dear Sir:
EnclosedpleasefindacopyofUnusualEventReportNo.50-26f/75/1,Additional-submitted to the Directorate of Licensing, for your information.
distribution of this report is being made as indicated on the attached.
Very.truly yours, M. t.
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Frederic E. Svart Superintendent Nuclear Production Fort St. Vrain, Nuclear Generating Station FES:ll t
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REPORT DATE: PLbruary 26, 1975 UNUSUAL F.VE'iT OCCURRENCE DATE: January 17, 1975
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FORT ST VRAIN NUCLEAR CENERATING STATIOff d,' '. ' ' [...
PUBLIC SERVICE CO:IPNiY OF COLORADO f,Q Q
s P. O. BOX 361
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PLATTEVILLE, COLORADO 80651
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..r REPORT No. 50-267/75/1-A 1 y *,'.,
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FINAL IDENTIFICATION OF OCCURRENCE:
An electrical inspection of the nain control board and auxiliary electrical equipment roon revealed discrepancies it. niaintaining loop and bus segregdtion requirenents according to Specification 1-N-2, Supplenent.
The segregation violations are the accumulated results of modifications and revis.fot's to the essential circuits since the initial audit involving single failure criterla.
CONDITIONS PRIOR TO OCCURnr.'ct:
Steady Stnte Power Routine Shutdovn llot Shutdown Routine Load Change X
Cold Shutdown Other (Specify)
~
Refueling Shutdown Routine Startup The major plant parameters at the time of the event were as follows:
O weli Power RTR Elect.
O we Secondary Coolant Pressure O
psig Temperature 0
- F Flow 0
- /hr.-
Primary Coolant Pressure O
psig Temperature
%100
- F Core Inlet s100
'F Core Outlet Flow 0
- /hr.
i 2570
Page 2 DESCRIPTION Or OCCURRENCE.:
Soac of the colored insulated uires used in the electrical installation work to denote non-interruptible Eds 1 and Bus 2 circuits and also some of the hand switches and relays used in essential circuits were not separated by the minimma distance to maintain segregation requirements.
APPARENT CAUSE OF OCCURRENCE:
Design Unusual Service Cond.
Including Environ.
Manufacture Conponent Failurc X
Installation /Const.
Other (specify)
Operator Procedure ANALYSIS OF OCCURRENCE:
Wiring and schematic diagrams and the work sheets used during an original
-electrical audit were reviewed to ensure that any modifications or revisions to essential circuits did not violate segregation requirements.
All dis-crepancies found were referred to the general contractor for review and correction.
CORRECTIVE ACTION:
All colored insulated wires used in essential circuits that do not meet segregation requirenents have been zipper tubed or changed to high temperature insulated wires. Hand switches and relays used in essential circuits that do not meet segregation requirements have been separated by asbestos barrier boards on February 11, 1975.
An inspection was perforned by Public Service Company to ensure that all electrical installation work is correct and meets segregation criteria.
FAILURE DATA /
SIMILIAR REPORTED OCCURRENCES:
None t
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Page 3 PROGRMDtATIC I!1 PACT:
None CODE I!! PACT:
None I
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RECO'01E!;DED :
ydnesReader Site Engineer Supc.intendent, Production Fort St. Vrain Nuclear Fort St. Vrain Nuclear
' Generating Station Generating Station 4
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