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 Niagara Mohawk Power Corp
To:	Grier B 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 ORG: SCHNEIDER R R DOCDATE: 02/24/78 NRC NIAGARA MOHAWK PWR 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: /4 ENCL INTERNAL: EG ILE~~~~W/ENCL NRC PDR44W/ENCL I 8. E%~% MIPC++W/3 ENCL SCHROEDER/I PPOL I T044 W/ENCL HOUSTON4+W/ENCL NOVAK/CHECK++W/ENCL GR IMES++W/ENCL KNIGHT++W/ENCL BUTLER++W/ENCL HANAUER+4W/ENCL TEDESCO++W/ENCL E I SENHUT++W/ENCL BAER44W/ENCL SHAO++W/ENCL VOLLMER/BUNCH>~W/ENCL KREGER/J. COLLINS44W/ENCL ROSA++W/ENCL K SEYFRIT/IE++W/ENCL EXTERNAL: LPDR'S OSWEGO'Y++W/ENCL TIC++W/ENCL I

NS C+4 W/ENCL ACRS CAT B++W/16 ENCL DISTRIBUTION: LTR 45 ENCL 45 CONTROL NB  : 780680044 SI ZE: iP+ iP THE END

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NMP-0124 NIAGARA MOHAWK POWER CORPORATION/300 ERIE BOULEVARD WEST, SYRACUSE, N.Y. 13202/TELEPHONE (315) 474-1511 Febeuucg 24, 1978 9

A.. Bogce H. G/L4.et, Commission Mn.ecto/I. ~f//pe U~ed Staf:e5 NueLea/1. ReguZato/I.y Region I '+~,t @ZAN c

631 Pa/I.k Avenue W/~Ay~~

King o( Pm56~, PA. 19406

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RE: Socket No. 50-220 Pea/I. (k. G/Iie/I,:

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 U. S. NUCLEAR REGULATORY COMMISSION (7 77)

LICENSEE EVENT REPOR

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CONTROL BLOCK: QI (PLEASE PRINT OR TYPE ALL REQUIRED INFORMATION)

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~o N Y N N P 1 QE 0 0 - 0 0 0 0 0 - 0 0 Q34 1 1 1 1 QE~QE 7 8 LICENSEE CODE 14 15 LICENSE NUMBER 25 26 LICENSE TYPE 30 57 CAT 58 CON'T

~01 soURGE MLQG 5 0 0 0 2 2 0 Qs. 0 2 2 4 7 8 Qg 7 8 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

~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 SYSTEM CAUSE CAUSE COMP. VALVE CODE CODE SUBCODE COMPONENT CODE SUBCODE SUBCODE

~Os ~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 Q17 LEAPPAO REPQRT ACTION FUTURE 4

EVENT YEAR

~78 21 22 EFFECT

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23 SHUTDOWN

~00 24 REPORT NO.

6 26

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27

~03 28 CODE ATTACHh'IENT 29 NPADP TYPE

~L 30 PRIME COMP.

31 NO.

~0 32 COMPONENT TAKEN ACTION ON PLANT METHOD HOURS 22 SUBMITTED FORM SUB. SUPPLIER MANUFACTURER gJQ~Q gJ 33 34 35 gJQ 36 37 o

40 41 Q33 ~Q34 42

~QEE 43 44 47 QEE 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 80 Q

~0Q FACILITY METHOD OF STATUS 66POWEA OTHER STATUS DISCOVERY DISCOVERY DESCRIPTION Q2 1 5 E Q2S 9 6 29 NA ~BQ31 45 46 Survei 1 1 ance Testing 80 ACTIVITY CONTENT RELEASED OF AEI.EASE Z

AMOUNT OF ACTIVITY nA Q LOCATION OF RELEASE Q Q33 ~ZQ34 7 8 9 10 44 45 80 PERSONNEL EXPOSURES NUMBER TYPE DESCRIPTION Q39 7

8

~00 0 Q37 Z Q33 NA 7 9 11 12 13 80 PEASONNEL IN3URIES 7 8 9 11 12 LOSS OF OR DAMAGE TO FACILITY TYPE DESCRIPTION Q43

~ZQ42 NA 7 8 9 10 80 PUBLICITY NRC USE ONLY ISSUED DESCRIPTION n l N IWnI NA I t i i 1J.L.LLL..Li I'7

,7 J NAMF- OF PREPARER Dennis MacVittie 315-343-2110 ext. ]558 0 a

PHONE:

NRC FORh1'366 U. b. NVCLFAR HEUULATOHY CL7<IIP Ilb>ICJEN I7 77)

ICENSEE EVENT REPORT P

( ONTROL BLOCK: I IPLEASE PRINT OR TYPE ALL REOUIREO INFORMATIONI I 6

~or N I Y N. I'I P 1 020 01 0 0 0 0 0 0 0 Q24 I I I I QE~QE 7 8 9 I.ICENSEE CODE 14 15 LICENSE NUAIBER 25 26 LICENSE TYPE'0 57 CAT 58 CON'T

~or 7 8 Eov'REE ~LQE 60 0 5 0 .0 0 2 2 68 QT.

69 EVENT DATE 74 O8022 478 75 REPORT DATE 80 61 DOCKET NUMBER ~

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 SYSTES1 CAUSE CAUSE COMP. VALVE CODE CODE "SUBCODE COMPONFNT CODE SUBCOOE SUBCODE 7 8

~SA Q ~EQ ~EQ 9 10 11 12 13 I N S T R 0 18 Q ~SQ ~2cl 19 20 SEQUENTIAL OCCURRENCE REPORT REVISION Qir LEREPRO REPQRT ACTION, FUTURE EVENT YEAR

~78 21 22 EFFECT

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23, SHUTDOWN

~00 24 REPORT NO.

6 26

~m 27

~03 28 ATTACHA1ENT CODE 29 NPROK

>YPE

~L 30 PRIME COMP

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31 NO.

~0 32 COMPONcNT TAKEN 33 Q18 ACTION LIEO>>

34 ON PLANT

~2O20 35 METHOD

~2Q21 36 37 0

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22 40 SUBS11 TTED

~NQ22 41 FORM SUB,

~TOTE SUPPLIER

~NQzs MANUFACTURER N 2 3 5 Q28 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

~O 7 8 9 80 FACILITY ~ I,IETHQD OF STATUS <<8 POWER OTHER STATUS DISCOVERY DISCOVERY OESCRIPTIQi'4 Q3 CO LJOS E 28 0 9 6 29 NA ~BQSI 45 46 Surveillance Testing 80 ACTIVITY CONTENT REI.EASED OF RELEASE AMOUNT OF ACTIVITY Q LOCATION OF RELEASE QB 8 ~2 Qzz ~2QEE NA NA 7 8 9 10 11 44 80 PERSONNEL EXPOSURES NUMBER TYPE DESCRIPTION

~I7 ~00 0 QTT ~L Q28 NA 7 8 9 11 12 13 80 PERSOiNiNEL INJURIES NUMBER O'ESCRIPTIONQ 8

~00 9

0 Qio 12 NA 7 11 80 LOSS OF OR DAMAGE TO FACILITY TYPE DESCRIPTION Q43 2 Q42 NA 7 8 9 10 80 ISSUED~

PUBLICITY

6) E~EE DESCRIPTION IEA

~ I I NRC IJSE ONLY I I I I .I .I..I. I I I "",

NAME OF PREPARER Dennis t 1acVi ttie PHONE:

315-343-2110 ext. 1558

To: PIB -39~)~) ',

Y<i'(lil~~.riG l'w:;b~:r rooN .3fa -gQ 2 lg~

lel ephonc lou::il~ci or<TL/To r TO: Frooi: Hiirgara lTol:a';cl; Po.jcr Corporation Director of Pco>>lat<<ry Operation bine hilt. Point, Duel cdr Station OSl;lK l. -.:ir,n I U>>lt fiT 63l Pari: l:;en c P 0. Bor. i<32 l:in@ nf Pros'ia, Ph. 19406 Lp'colllin9, hcl'I York 13093 SUPiilECT: PP.Ol',1'T Rl.PO.,TN)].!! OCD).J)El'CE DOC):l'.T ASSJ(islED LER HO. '8-09 l'0. "0-220 LICLl!SE l!0. DPR-G3 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 Institution of modiffcation in squib circuit per GE revisi'on

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FE(CILITV STATUS= S; TllEt:Wnt. bi( 1840 c) Routine Startop Slwit<foi~o d) Routln~ Sll:: dc"n refuel lng e) stea<ry s:.iie opLl- Other f) Load Cl'.-.age l(ot lippj'IcBI>IL IL i'riticn follow-up rcport will be sent v;itbin i<io v.'ccl:s.

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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 The shear charges were net as-described -4n the maStenance-procedure. - .

valves would not have operated to 5solate the TIP guide. tuba witlr the TIp inserted Dectrical connections vill be checked described in the and tested to assure.

that the explosive.va7.ves wAl operate as 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 detectnr the it is i.soTation not possible. te wfthdrwr the. se normaT automat%a.

system may function