05000289/LER-1983-046, Revised LER 83-046/01T-1:on 831214,nuclear safety-related Circuit for make-up Pump Lube Oil Pressure Trip Found Incorrectly Routed.Caused by Design Oversight.Circuits for make-up Pumps Rerouted in Raceways

Revised LER 83-046/01T-1:on 831214,nuclear safety-related Circuit for make-up Pump Lube Oil Pressure Trip Found Incorrectly Routed.Caused by Design Oversight.Circuits for make-up Pumps Rerouted in Raceways

ML20080H789
Person / Time
Site:	Three Mile Island
Issue date:	01/31/1984
From:	Hukill H GENERAL PUBLIC UTILITIES CORP.
To:	Murley T NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION I)
References
5211-84-2017, LER-83-046-01T, LER-83-46-1T, NUDOCS 8402140323
Download: ML20080H789 (4)

LER-2083-046, Revised LER 83-046/01T-1:on 831214,nuclear safety-related Circuit for make-up Pump Lube Oil Pressure Trip Found Incorrectly Routed.Caused by Design Oversight.Circuits for make-up Pumps Rerouted in Raceways

Event date:
Report date:
2892083046R00 - NRC Website

text

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( EVENT DESCAIPTION AND PROBABLE CONSEQUEN ES h f I: f : l l_ A Nuclear Safety. related circuit for the make-up put; lube cil cressure rrir was l

, ; ., i l found to be incorrectly routed (MU-PIC) . The green tarked Cable was reuted in the l

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; Ired channel tray. Some of the cables for the rakeur :::: lube cil'eressure :rir l l: ,s[ l circuit for MU-PlA, B and C are routed in non-safety trays. Due to current plant l

[o se l l condition no threat to public health and safety existed. This is reportable per [

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32 21 22 23 24 26 27 28 29 ACTION FUTURE EFFECT SHUTDOWN ATT ACHV ENT NDRD4 PRIME coup. Cou'ONENT TAKEN ACTION ON PLANT METHOD hours EUBMITTED FORMsv8. SUPPU E R MANUFACTURER l 0l 6l 0l lz l9 l9 l9 lg

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]@ 44 47 33 34 35 36 CAUSE DESCRIPT10N AND CORRECTIVE ACTIONS li l o l ] The circuits were originally installed as non-safety circuits and were not upgraded l li ;i l l vhen the circuir was mod'ified. This circuit will be disconnected until orcoer serara- t

,. ,_,j tion is achieved.

Circuits for all makeup pures will be rerouted in safety trade  !

,. ,3; i raceways,

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DISCOVERY DESORI' TION NRC Order QC Report j i: 151,l X l@ l 0 l 0 l 0 ]Q] 44 l lB]Ql 45 4E s:

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l RESPONSE TO LER E3- 4 I. CURRENT ACTIVITES AT THE TIME OF OCCURRENCE

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• Three Mile Island Unit I was in cold shutdown.

g II. CIRCUMSTANCES LEADING TO HE OCCURRENCE -

In about 1974 a codification was implemented to pr: vide a icw lube cil pressure

i. trip to MU-P1A, 3 and C. ~ The trip signal was blocked upon receipt of an Engineered Safeguards (ES) signal.

P b The oil pressure switches were replaced in (1977) with switches that were L seismically rated and ES interlock was removed. A: this time, the cables g should have been upgraded to safety grade, but were not.

4L Material Non-Conformance Report 115-81 identified a green marked cable in i a red channel tray. The cable was found to be related to the oil pressure trip. The cable was found to be incorrect 1" routec. .ne circuit was also

[ found to be classified as not important to safety.

t i III. DESCRIPTION The circuits for MU-PIC low oil pressure trip do not meet separation criteria. .

. The circuits were originally instelled as non-safety circuits and were not upgraded when the circuit was modified. This circuit did not meet the routing L' criteria for an important to safety circuit in that it originated in a green

~ b_ channel panel and was routed in a red channel tray. Trip circuits for MU-P1A k* and B have installed inacceptable aration. These circuits for MU-P1A B and C. are some non-sase!ety trays; however, the trays are all in Seismic 1 Buildings k- and have the same design as seismically mounted trays.

IV. RESULTANT EVENTS

! No significant event took place as a result of this event.

7. PREVIOUS EVENTS OF A SIMILAR NATUPZ LER 83-044 VI. ROOT CAUSE .

The apparent root cause for the occurrence was design oversight in that the trip circuits were not upgraded to meet separation criteria vhen the Field .4 Change package was issued to remove the ES interlock. ..

TII. IMMEDIATE CORRECTIVE ACTION So i==ediate corrective action is required because Of current plant conditien.

However, it should be noted that p ccedures implemen:ed sincy 9S1 previde assurance.that this type of event is unlikely te recur.

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Vill. LONG TERM CORRECTIVE ACTION

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1. Circuit routing for MU-PlA and B were reviewed and found to have acceptable separation. The seismic adequacy of the circuits circuits for MU-PIA and B has been confirmed and lube oil pressure trip will be disconnected for MU-Plc until acceptable separation is established. The lube oil pressure trip circuit for MU-Plc may be reconnected for Tech Spec testing but will be disconnected when the

l. test is complete. Disconnecting the low pressure trip is acceptable because it is for equipment protection only and the HPI function will be fully operable with cable disconnected. A modification package is being prepared to re-route the circuits in question for MU-PlA, B, and C. This modification is scheduled to be completed by July, 1984.

2. A review of all cable routing for modifications initiated after issuance of THI-1 Operating License, which upgraded a system or ecmponent to safety grade will be performed to assure that cables are properly routed and classified. This will be completed by July, 1984.

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. o GPU Nuclear r.orporation Nuclear  ;;;, cme:r8o s

Midd!etown, Pennsylvania 17057 0191 717 944 7621 TELEX 84 2386 Writer's Direct Dial Number:

January 31, 1984 l 5211-84-2017 Dr. T. E. Murley Region I, Regional Administrator U. S. Nuclear Regulatory Commission 631 Park Avenue King of Prussia, PA 19406

Dear Sir:

Three Mile Island Nuclear Station; Unit l'(TMI-1)

Operating License No. DPR-50 Docket No. 50-289 LER 83-046/01T-1 Attached is revision (1) to Licensee Event Report 83-046/01T concerning improper safety-related circuit routing. Margin bars indicate where changes have been made.

Sincerely,

1. ). I kill Director, TMI-1 IIDil: RAS:j rg Enclosure cc: R. J. Conte Document Management Branch GPU Nuclear Corporation is a subsidiary of the General Public Utilities Corporation d' i ' '