ML18018B265

LER 78-006-00 for Nine Mile Point, Unit 1 Re During Steady State Operation, Performance of Surveillance Test IC-75 Found a Trip Setpoint of 22.5 Inches Water on One Vacuum Switch in the Vacuum Relief System from the Pressure Suppression Cha

ML18018B265
Person / Time
Site:	Nine Mile Point
Issue date:	02/24/1978
From:	Schneider R R Niagara Mohawk Power Corp
To:	Grier B H Office of Nuclear Reactor Regulation, NRC Region 1
References
NMP-0124 LER 78-006-00
Download: ML18018B265 (10)

Text

REGULATORY INFORMATION DISTRIBUTION SYSTEM<RIDS)DISTRIBUTION FOR INCOMING MATERIAL 50-220 REC'RIER B H NRC ORG: SCHNEIDER R R NIAGARA MOHAWK PWR DOCDATE: 02/24/78 DATE RCVD: 03/07/78 DOCTYPE: LETTER NOTARIZED:

NO COPIES RECEIVED

SUBJECT:

LTR 0 ENCL 1 LICENSEE EVENT REPT<RO 50-220/78-06)

ON 01/27/78 CONCERNING PERFORMANCE OF SURVEILLANCE TEST IC-75 FOUND A TRIP SETPOINT OF 22.5 INCHES WATER ON ONE VACUUM SWITCH IN THE VACUUM RELIEF SYSTEM FROM THE PRESSURE SUPPRESSION CHAMBER TO THE RX BLDG (68-12B>.PLANT NAME: NINE MILE PT-UNIT 1 REVIEWER INITIAL: X JM DISTRIBUTOR.

INITIAL: gQ DISTRIBUTION OF THIS MATERIAL IS AS FOLLOWS INCIDENT REPORTS<DISTRIBUTION CODE A002)FOR ACTION: INTERNAL: EXTERNAL:/4 ENCL EG ILE~~~~W/ENCL I 8.E%~%SCHROEDER/I PPOL I T044 W/ENCL NOVAK/CHECK++W/ENCL KNI GHT++W/ENCL HANAUER+4W/ENCL E I SENHUT++W/ENCL SHAO++W/ENCL KREGER/J.COLLINS44W/ENCL K SEYFRIT/IE++W/ENCL LPDR'S OSWEGO'Y++W/ENCL TIC++W/ENCL NS I C+4 W/ENCL ACRS CAT B++W/16 ENCL NRC PDR44W/ENCL MIPC++W/3 ENCL HOUSTON4+W/ENCL GR IMES++W/ENCL BUTLER++W/ENCL TEDESCO++W/ENCL BAER44W/ENCL VOLLMER/BUNCH>~W/ENCL ROSA++W/ENCL DISTRIBUTION:

LTR 45 ENCL 45 SI ZE: iP+iP THE END CONTROL NB: 780680044

~4.I~Ihh Ih h J t'V;.>'1:,"',"t,', 4~*khh'I t',"V I I I I I kl hh Ik h~l'~I, k k~h,PV"k htt"I 4'h h h 4 4 ,'I~Vk I h,b I,K H((LQRE MMH teI'F(NMP-0124 NIAGARA MOHAWK POWER CORPORATION/300 ERIE BOULEVARD WEST, SYRACUSE, N.Y.13202/TELEPHONE (315)474-1511 Febeuucg 24, 1978 A..Bogce H.G/L4.et, Mn.ecto/I.

U~ed Staf:e5 NueLea/1.ReguZato/I.y Commission Region I 631 Pa/I.k Avenue King o(Pm56~, PA.19406 RE: Socket No.50-220 Pea/I.(k.G/Iie/I,: 9~f//pe'+~,t@ZAN c W/~Ay~~/In acco/u(ance uIith Nine NLe Point Nuct'.ea/I.

S~on Unit>1 Technicat'.

Speci.+cation/, me he/1eby sub~Licensee Event Repo/Lt LER 78-06, IvhichLe in v~o~n o(Section 3.3.6.F o)Ae Technicat'pecigcations.

Th&aepoM uIm completed in She JotuIat designated in NUREG-0161, dated JId'(g 1977.Ve/I.y~g go~, ORIGINAL SIGNEP BY R.R.SCHNEISER R.R.Schneide/I, Vice P/I.u&e<-ELecttu.c P/I,odu~on n4n Attachments (3)xc: Nrce&on.,'0(I(ice o(18E (30 copiu)Si/Iecto/L, 0(pce o(h(IPC (3 copim)78pggo NRC FORM 3GG (7 77)U.S.NUCLEAR REGULATORY COMMISSION

~o 7 8 CON'T~01 7 8 Qs.0 2 2 4 7 8 Qg soURGE MLQG 5 0 0 0 2 2 0 60 61 DOCKET NUMBER 68 69 EVENT DATE 74 75 REPORT DATE 80 EVENT DESCRIPTION AND PROBABLE CONSEQUENCES Q10 Durin stead state o eration erformance of surveillance test IC-75 LICENSEE EVENT REPOR~~~CONTROL BLOCK: QI (PLEASE PRINT OR TYPE ALL REQUIRED INFORMATION)

I 6 N Y N N P 1 QE 0 0-0 0 0 0 0-0 0 Q34 1 1 1 1 QE~QE LICENSEE CODE 14 15 LICENSE NUMBER 25 26 LICENSE TYPE 30 57 CAT 58~03 found a tri set oint of 22.5 inches water on one vacuum swi tch in the~o 4 vacuum relief s stem from the ressure su ression chamber to the Rx~o 5 Buildin (68-12B).T.S.3.3.64F re uires a set oint less than or equal~o G to 0.5 si 13.85 inches water.This condition resulted in minimal~o 7 safet im lications.

A redundant switch was available to initiate~o s o eration of the vacuum relief valve.7 8 9 80~Os SYSTEM CAUSE CAUSE COMP.VALVE CODE CODE SUBCODE COMPONENT CODE SUBCODE SUBCODE~SA Q>>E Q13~6Q13 I N S T R 0 04~SQPE~Z QPE 7 8 9 10 11 12 13 18 19 20 SEQUENTIAL OCCURRENCE REPORT REVISION LEAPPAO EVENT YEAR REPORT NO.CODE TYPE NO.Q17 REPQRT~78~~00 6~~~03~L~0 21 22 23 24 26 27 28 29 30 31 32 ACTION 4 FUTURE EFFECT SHUTDOWN ATTACHh'IENT NPADP PRIME COMP.COMPONENT TAKEN ACTION ON PLANT METHOD HOURS 22 SUBMITTED FORM SUB.SUPPLIER MANUFACTURER gJQ~Q gJ gJQ o" Q33~Q34~QEE QEE 33 34 35 36 37 40 41 42 43 44 47 CAUSE DESCRIPTION AND CORRECTIVE ACTIONS Q27 o The cause of the failure was instrument drift in a mercoid model CP4122 vacuum switch.Trip setpoint was reset to 6.8 inches water.Current surveillance testing schedules are adequate to ensure early detection of future instrument drifts.7 8 9 FACILITY STATUS 66POWEA OTHER STATUS Q 1 5 E 2S 9 6 29 NA Q~0Q ACTIVITY CONTENT RELEASED OF AEI.EASE AMOUNT OF ACTIVITY Q Z Q33~ZQ34 nA 7 8 9 10 44 PERSONNEL EXPOSURES NUMBER TYPE DESCRIPTION Q39 7~00 0 Q37 Z Q33 NA 7 8 9 11 12 13 PEASONNEL IN3URIES METHOD OF DISCOVERY DISCOVERY DESCRIPTION Q2~BQ31 Survei 1 1 ance Testing 45 46 LOCATION OF RELEASE Q 45 80 80 80 80 7 8 7 8 n ,7 NAMF-OF PREPARER Dennis MacVittie 9 11 12 LOSS OF OR DAMAGE TO FACILITY Q43 TYPE DESCRIPTION

~ZQ42 NA 9 10 PUBLICITY ISSUED DESCRIPTION l N IWnI NA 80 NRC USE ONLY I t i i 1J.L.LLL..Li I'7 J315-343-2110 ext.]558 0 , PHONE: a NRC FORh1'366 I7 77)U.b.NVCLFAR HEUULATOHY CL7<IIP Ilb>ICJEN I IPLEASE PRINT OR TYPE ALL REOUIREO INFORMATIONI 6 1 020 01 0 0 0 0 0 14 15 LICENSE NUAIBER 0 0 Q24 I I I I QE~QE 25 26 LICENSE TYPE'0 57 CAT 58 ICENSEE EVENT REPORT P (ONTROL BLOCK: I~or N I Y N.I'I P 7 8 9 I.ICENSEE CODE CON'T~or Eov'REE~LQE 0 5 0.0 0 2 2 QT.O8022 478 7 8 60 61 DOCKET NUMBER 68 69 EVENT DATE 74~75 REPORT DATE 80 EVEITIT DESCRIPTION ANO PROBABI.E CONSEQUENCES 10~oz Burin stead state o eration erformance of surveillance test IC-75~o 2 found a trip setpoint of 22.5 inches water on one vacuum switch in the~o R vacuum relief s stem from the ressure su ression chamber to the Rx~o s Buildin (68-128.T.S.3.3.6.F requires a setpoint less than or equ'al~o 8 to 0.5 si 13.85 inches ivater.This condition resulted in minimal~o T safet im Iications.

A redundant switch was available to initiate~o 8 o aration of the vacuum relief valve.7 8 9 80 7 8 SYSTES1 CAUSE CAUSE COMP.VALVE CODE CODE"SUBCODE COMPONFNT CODE SUBCOOE SUBCODE~SA Q~EQ~EQ I N S T R 0 Q~SQ~2cl 9 10 11 12 13 18 19 20 SEQUENTIAL OCCURRENCE REPORT REVISION LEREPRO EVENT YEAR REPORT NO.CODE>YPE NO.Qir REPQRT~78~~00 6~m~03~L~~0 21 22 23, 24 26 27 28 29 30 31 32 ACTION, FUTURE EFFECT SHUTDOWN ATTACHA1ENT NPROK PRIME COMP COMPONcNT TAKEN ACTION ON PLANT METHOD~OURS 22 SUBS11 TTED FORM SUB, SUPPLIER MANUFACTURER Q18 LIEO>>~2O20~2Q21 0 0 0~~NQ22~TOTE~NQzs N 2 3 5 Q28 33 34 35 36 37 40 41 42 43 44 47 CAUSF DESCRIPTION AND CORRECTIVE ACTIONS'27 o The cause of the failure was instrument drift in a mercoid model CP4122 vacuum switch.Trip setpoint was reset to 6.8 inches water.Current surveillance testing schedules are adequate to ensure early detection of future instrument drifts.4 7 8 9 FACILITY~STATUS<<8 POWER OTHER STATUS S E 28 0 9 6 29 NA 7 8 7 8 9 11 12 LOSS OF OR DAMAGE TO FACILITY Q43 TYPE DESCRIPTION 2 Q42 NA 9 10 PUBLICITY ISSUED~DESCRIPTION

~6)E~EE IEA Dennis t 1acVi tti e NAME OF PREPARER CO LJO~O ACTIVITY CONTENT REI.EASED OF RELEASE AMOUNT OF ACTIVITY Q 8~2 Qzz~2QEE NA 7 8 9 10 11 44 PERSONNEL EXPOSURES NUMBER TYPE DESCRIPTION

~I7~00 0 QTT~L Q28 N A 7 8 9 11 12 13 PERSOiNiNEL INJURIES NUMBER O'ESCRIPTIONQ

~00 0 Qio NA I,IETHQD OF DISCOVERY~BQSI 45 46 NA DISCOVERY OESCRIPTIQi'4 Q3 Surveillance Testing LOCATION OF RELEASE QB 80 80 80 80 80 80 NRC IJSE ONLY I I I I I I.I.I..I.I I I"", 315-343-2110 ext.1558 PHONE:

To: PIB-39~)~)rooN.3fa-gQ 2 lg~or<TL/To r Y<iŽ(lil~~.riG l'w:;b~:r', lel ephonc lou::il~ci TO: Director of Pco>>lat<<ry Operation OSl;lK l.-.:ir,n I 63l Pari: l:;en c l:in@nf Pros'ia, Ph.19406 Frooi: Hiirgara lTol:a';cl; Po.jcr Corporation bine hilt.Point, Duel cdr Station U>>lt fiT P 0.Bor.i<32 Lp'colllin9, hcl'I York 13093 SUPiilECT:

PP.Ol',1'T Rl.PO.,TN)].!!

OCD).J)El'CE DOC):l'.T l'0."0-220 LICLl!SE l!0.DPR-G3 ASSJ(islED LER HO.'8-09 CYGNET DATE: 78022E REPORT Df<TE: 78022I EVErlT DFSCRIPTTnrl:

SEE ATTACHED.CO:(POlKliTS Il'OL"ED: TIP machine shear va'1ve squfb devices , CAUSE l(t!D RKr':ENf(L ACTIDIL circuit per GE revisi'on Institution of modiffcation in squib FE(CILITV STATUS=c)Routine Startop d)Routln~Sll:: dc"n e)stea<ry s:.iie opLl-~f)Load Cl'.-.age S;TllEt:Wnt.

bi(1840 Slwit<foi~o refuel lng Other l(ot lippj'IcBI>IL IL i'riticn follow-up rcport will be sent v;itbin i<io v.'ccl:s.vr..roon ro 35 7 6.H:i ll.roo~rV: P.~~a" owL a 2.i llM H.

ATTACHMENT TO LER 78-09 Event

Description:

During routine station operation with the TIP detectors.

withdrawn, repTacement explosive charges in the TIP system shear valves were replcaed with new charges.Following replacement, it was found that the ohmneter contlnuity test for acceptable eTectric contact was unsatisfactory.

The normal TIP tube tsoTaticm system was.operabTe at this time.I It was found thart the.actual etectricaV connections to the.explosive charges were net as-described

-4n the maStenance-procedure.

-The shear.valves would not have operated to 5solate the TIP guide.tuba witlr the TIp inserted Dectrical connections vill be checked and tested to assure.that the explosive.va7.ves wAl operate as described in the operatic procedures."..Station records;including.

the au6ntenance.-.procedures,-wfTT

=be corrected to reflect the correct.wiriny connections An end-ta-end demonstration-at'he.

explosive shear va7ves=will be performed'ith the explosive charge removed.from..the, system..'orrective action wfll be compTeted before the TIP system is again used r The explosive operated TIP shear tsolation valves are a back-up system to be used for isa'Eatioe of the TIP tubes in the event it is not possible.te wfthdrwr the.detectnr se the normaT automat%a.

i.soTation system may function