PNO-V-87-011, on 870204,all Four Channels of Pressurizer Level Indication Shared Common Section of Raceway in Single Fire Zone & on 870206,licensee Reported Five More Misrouted Cables.Caused by Personnel Errors.Corrective Actions Taken

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PNO-V-87-011:on 870204,all Four Channels of Pressurizer Level Indication Shared Common Section of Raceway in Single Fire Zone & on 870206,licensee Reported Five More Misrouted Cables.Caused by Personnel Errors.Corrective Actions Taken
ML20210T178
Person / Time
Site: Rancho Seco
Issue date: 02/06/1987
From: Dangelo A, Miller L
NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION V)
To:
References
PNO-V-87-011, PNO-V-87-11, TAC-65195, NUDOCS 8702180095
Download: ML20210T178 (1)


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' PRELIMINARY NOTIFICATION'0F. EVENT;0R UNUSUAL OCCURRENCE--PSiO-RV-87-11-' Datt:-02/06/87

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1 Th'is prelim'inary notification constitukes EARLY nokice of- events of'POSSIBLE safety or '

public interest significance.f The information presented.is as initially received

, without verification or evaluation and;is' basically all-that is- known by Region V: staff; ton this date.'

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~ FACILITY: ' Sacramento Municipal Utility District: . Emergency Classification . . _,

. Rancho Seco- .

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Notification of Unusual Event-1

' Docket No. 50-312 Alert < [

Site' Area Emergency '

< General Emergency ~ -

-XX Not Applic~able

SUBJECT:

-CABLE ROUTING ERRORS AT RANCHO SECOs

'The licensee reported the discovery on 02/04/87~ that' all fou'r' channels. of pressurizer -

loval indication shared a comon section ofl raceway in a single fire; zone, contrary tos c the design.and fire protection requirements. "This discovery was made'during the early stag:s of a licensee cable tracing inspection program initiated when two" examples of sin 11ar misrouting were discovered by the licensee,in May,1986 (reported in LER 86-10).- .

~On 02/06/87,' the licensee reported five more similarly misrouted cables: steam..

generator. pressure, steam generator full range level channel A and B, cold leg stemptrature channel B, and makeup tank level channel C.

' Region V has received additional preliminary information from the licensee which indicates that the misrouted pressurizer level cable had originally been. discovered by

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'the licensee in 1984 or 1985. Corrective action was reportedly fonnulated and e ,

documented as completed, but not actually performed. This mistake appears.very similar-, ~,

' Sto the instance reported in LER 86-10 in that in both cases;the: work: documentation- -

wrongly indicated satisfactory corrective action for an identified ~ Appendix R "

discrepancy had been completed. The licensee' believes that the same individual may have been responsible for both errors, and is expanding their inspection to include al.1:

of his work of this type.

The licensee has completed 26 cable traces to date, with about 130 planned for the initial sample. Region V is conducting a special inspection of this situation. .

-This information is current as = of 1:00 pm (PST). -

' CONTACT: L. Miller A. D'Angelo FTS 463-3869 209-748-2791 l

, DISTRIBUTION l

'H St. MNBB Phillips E/W: Willste Air Rights Maili

' Chairman Zech EDO NRR IE NMSS ADM:DMB COMM. Roberts PA- OIA RES 1 DOT:Transu0nly

'Comm. Asselstine MPA AE00 ,

Com. Bernthal. OGC Regions:-

Comm. Carr -

.SECY INPO NSAC ACRSa Licensee: .

CA '. (ReactorLicensees) REGION V: FORM 211 ,

PDR- Resident Inspector __, (Revised 3/14/83) 5 8702180095 870206 -0 PDR I&E PNO-V-87-011 PDR q g