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| {{Adams
| | #REDIRECT [[05000315/LER-1985-058]] |
| | number = ML20197D416
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| | issue date = 05/09/1986
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| | title = :on 851027,during Hot Standby,West motor-driven Auxiliary Feed Pump (Afp) Tripped on Low Suction Pressure When tubine-driven Afp Inoperable.Caused by Foreign Matls in Gauge Protectors.Pump Operation Restored
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| | author name = Gibson L, Smith W
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| | author affiliation = INDIANA MICHIGAN POWER CO. (FORMERLY INDIANA & MICHIG
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| | addressee name =
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| | addressee affiliation = NRC OFFICE OF ADMINISTRATION (ADM)
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| | docket = 05000315
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| | license number =
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| | contact person =
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| | document report number = LER-85-058, LER-85-58, NUDOCS 8605140263
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| | document type = LICENSEE EVENT REPORT (SEE ALSO AO RO), TEXT-SAFETY REPORT
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| | page count = 4
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| }}
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| {{LER
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| | Title = :on 851027,during Hot Standby,West motor-driven Auxiliary Feed Pump (Afp) Tripped on Low Suction Pressure When tubine-driven Afp Inoperable.Caused by Foreign Matls in Gauge Protectors.Pump Operation Restored
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| | Plant =
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| | Reporting criterion =
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| | Power level =
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| | Mode =
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| | Docket = 05000315
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| | LER year = 1985
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| | LER number = 58
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| | LER revision = 0
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| | Event date =
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| | Report date =
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| | ENS =
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| | abstract =
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| }}
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| =text=
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| {{#Wiki_filter:i i RC Feem see u S. NuCLEm LEautt. TORY COMasssBION i
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| '9 83)
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| APPROVED OMS NO. 31e6410e LICENSEE EVENT REPORT (LER)
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| ' x''a's
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| ''8' "
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| F ACILITY NAME (Il DOCKET NUtsSER 42)
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| PAGE133 D. C. Cook Nuclear Plant - Unit 1 ol51ol0lo13IlI5 1 lOFl013 41(LE les Inoperable Auxiliary Feed Pump EVENT DATE ISI LER NUMSER (g) stEPORT DATE (75 OTHER F ACILITIES INVOLVED tel MONTM DAV YEAR YEAR S'g M ',''
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| MONTM DAY VEAR F AC.LiTV N AMES DOCKET NUMBER ($)
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| G 0 15101010 1 I i 1l0 2l7 8 5 8l5
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| ~
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| 0l 5l 8 0l2 0l 5 0l 9 8l 6 0 1 5 1 0 1 0 1 0 1 I I THIS REPORT 18 SUSMITTED PURSUANT TO THE REOUIREMENTE OF 10 CFR $ (Chece eae or more er rae wowsf (11)
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| OPE R ATM 3
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| m.0mi 20 0.iei
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| .0mislaHiel n7mi POtWE R 50 36telti)
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| X 50 mum 2iM 73 M 20 405!aH1Hil
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| 'Iiat' 0l 0,0 20 AmieHuw
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| OTutR (s,ecsfy M A&mect 20 40S! alt 1Hdel 60.734eH2Hil 50 734eH2H=WHAD J5dA1 20 406elt1Hiel 90 734al:2)tiel 30.73tell21tweiiHEl 20 406telt1Het 50.73teH2Heial 30.73deH2Hal LICENSEE CONTACT FOR THIS LER titt NAME TELEPMONE NUMBER AREA CODE L.
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| S. GIBSON - TECHNICAL ENGINEERING SUPERINTENDENT 6l1 i 6 46 i 5 1519 1 01 1 i
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| 1 COMPLETE ONE LINE FOR EACM COMPONENT F AILURE DESCRigED IN THIS REPORT (131 m
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| :- m ow-RE RTA
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| ,A C.
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| ,AC-R AtA8tE
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| ==CAUSE==
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| SYSTEV COVPONENT pp 5
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| ==CAUSE==
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| sy sTE M COMPONENT pp g I
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| 1 I I I I I I
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| I l i I f f I
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| I I I i l l l'
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| I f l l l l SUPPLEMENTAL REPORT EXPECTED lien MONTM DAY VEAR SV8U!S$10's vEs (19 res two.ere EXPECTED SusutsS10N DATE)
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| NO l
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| l l
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| AS$TR ACT ILrmer to 1600 spaces e a. enero****e y rateen norsve saece troeoversen 1 east (18 This is a follow-up LER to report corrective / preventative action.
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| On October 27, 1985, at 2027 hours, with the unit in hot standby, the west motor driven auxiliary feed pump tripped on low suction pressure coincident with the turbine driven auxiliary feed pump Ints inoperable for testing.
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| The action statement of Technical Eo Specification 3.7.1.2, which requires at least three auxiliary M
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| feed pumps operable, had been voluntarily entered on October g
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| 25, 1985, at 1056 hours, for operability testing of the turbine ou driven pump.
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| However, the coincident loss of the motor driven pump caused entry into the Technical Specification 3.0.3 requirement that action be initiated within one hour to place l
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| om o o-the unit at least hot shutdown (Mode 4) within the following 00 six hours.
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| 18o EU Operator action restored the inoperable motor drive pump to operable status in 18 minutes.
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| The unit was then under the actions statement requirements of Technical Specification 3.7.1.2.
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| The turbine driven pump was subsequently declared operable at 0923 hours on October 28, within the 72 hour limit.
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| This event does not constitute an unreviewed safety question as defined in 10 CFR 50.59 because the length of time that the to pumps were inoperable was within the action statement limits.
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| *"e'J ''" "*
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| I,E M s
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| i} I
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| I NRC Ferne 3 4A U S NUCLEA2 EEiULATOMY COMMISSION LICENSEE EVENT REPORT (LER) TEXT CONTINUATION AreaovEo Ove so mo-cio.
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| EXPIRES: 5,3188 F ACIUTY NAME til DOCKET NUMBER (21 ggg gygggg ggg pagg g33
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| " n'.''
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| Ol'.?:
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| X
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| *saa D. C. Cook Nuclear Plant - Unit 1 o (5 l0 [o lo 131115 81 5 01518 01 2 01 2 0F 0l3 rExt w-we r assamm on October 27, 1985, at 2027 hours, with the unit in hot standby the west motor driven auxiliary feed pump (IEEE/P) tripped on low suction pressure coincident with the turbine driven auxiliary feed pump (IEEE/P) inoperable for testing.
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| The action statement of Technical Specification 3.7.1.2, which requires at least three auxiliary feed pumps operable, had been voluntarily entered on October 25, 1995, at 1056 hours, for operability testing of the turbine driven pump.
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| : However, the coincident loss of the motor driven pump caused entry into the Technical Specification 3.0.3 requirement that action be initiated within one hour to place the unit into at least hot shutdown (Mode 4) within the following six hours.
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| Investigation revealed that an unusual combination of factors was involved.
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| During the testing of the turbine driven auxiliary feed pump (TDAFP) (IEEE/P) a faulty governor (IEEE/65) caused the turbine speed to oscillate at approximately 2.2 cycles per second.
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| This resulted in pressure oscillations of the suction side of the motor driven auxiliary feed pump (MDAFP) (IEEE/P) which was in service.
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| Foreign material in the suction gauge protectors on the MDAFP acted as a check valve to permit the pressure sensors to sense only the low pressures of the oscillations by preventing the higher pulses from reaching the sensors.
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| This caused the sensors to ratchet progressively lower, resulting in a 2 out of 3 low suction pressure coincidence and tripped the MDAFP.
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| Operator action was to dislodge the foreign material in the gauge protectors and restore the pressure sensors resulting in an operable MDAFP.
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| Following an engineering justification, the automatic low suction pressure trips were disabled on the auxiliary feed system and replaced with the equivalent safety function using the operator / alarm.
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| The suction pressure gauge protectors and associated instrument piping were then cleaned and returned to service.
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| The TDAFP governor, governor valve linkage, governor valve cam, and governor valve stem were all replaced.
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| J The TDAFP was successfully tested and returned to service at 0923 hours on October 28, 1985, within the 72 hour Technical Specification limit.
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| Thls event does not constitute an unreviewed safety question as defined in 10 CFR 50.59 because the length of time that the two pumps were inoperable was within the action statement limits.
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| NAC Fomu 364A 87, 4 3)
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| NRC,orm 3e4A U S NUCLEAR G E LULATCIY ComeMisssON LICENSEE EVENT REPORT (LER) TEXT CONTINUATION Aremoveo OMS Na mo-oio.
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| EXPIRES S/31 se FACsLITY NAME H)
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| DOCKET NUMSER Q)
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| LE A NUMSIR d61 PAGE13)
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| D. C. Cook Nuclear Plant - Unti 1 oIslololol3l1l5 8l 5 0l 51 8 012 01 3 OF 013 rex w m C, agw.,nn CORRECTIVE / PREVENTATIVE ACTION
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| ~
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| A teleconference was held between American Electric Power Service Corporation (AEPSC) and NRR on May 5, 1986, regarding removal of the auxiliary feedwater pump low suction pressure trip and replacing it with an alarm / operator action combination.
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| AEPSC referenced the' original letter (dated December 11, 1979), in which AEPSC agreed to install the low suction pressure trips.
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| AEPSC told the NRR that this original letter also contained a I
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| statement to the effect that the co;ndensate storage tanks had been analyzed to show.that they are capable of withstanding b~th o
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| the operating and design-basis earthquakes.
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| AEPSC also pointed out that at full-flow conditions in the auxiliary feedwater system, there is-a-14-minute time interval'between the coment when the water level in the. tank is at the low suction pressure
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| ~
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| alarm position and the moment when the water level drops to the center line of the suction pipe for the AFS pumps.
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| NRR stated that their major concerns were that't!he. tanks could withstand a design-basis earthquake, and that sufficient time ~was allowed for operators action.
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| They believe'd that the' automatic trip could be changed to an alarm function.
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| It was indicated that the change in agreement-should be' documented, and should also include some discussion of missiles.
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| Currently a letter to this effect is sche'duled to be mailed to the NRC by May 31, 1986.
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| 1 The feedback received from NRR'on th'is subject indicates there is a very good chance. that the request for permanent relief from the trip will be granted.
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| Based.on this, we shall pursue the removal of the low suction pressure trips as preventative / corrective action.
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| Omu Mea
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| y 4
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| cg L; IND NA & MICHIGAN ELECTRIC COMPANY DONAL3 C. COOK NUCLEAR PLAST P.O. Box 458, Bridgman, Michigan 49106 (616) 465-5901 May 9, 1986 United States Nuclear Regulatory Commission Document Control Desk Washington, D.C.
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| 20555 Operating License DPR-58 Docket No. 50-315 Document Control Manager:
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| In accordance with the criteria established by 10CFR50.73 entitled Licensee Event Reporting System, the following report /s are being submitted:
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| 85-058-02 Sincerely, n =-f:
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| M W.G.
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| Smith, Jr.
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| Flant Manager
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| /cbm Attachment cc:
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| John E.
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| Dolan J.G.
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| Keppler, RO:III l
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| M.P.
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| Alexich R.F.
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| Kroeger H.B.
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| Brugger R.W.
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| Jurgensen NRC Resident Inspector R.C. Callen, MPSC G. Charnoff, Esq.
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| D. Hahn INPO
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| :- PNSRC A.A.
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| Blind l
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| Dottie Sherman, ANI Library File I
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| }}
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| {{LER-Nav}}
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