ML19352A095

LER 77-002/01T-0:on 770314,stack Gas Sample Pump B Tripped. Caused by Failure of Diaphragm Operated Valve in Lubricant Recirculation Sys.Pump Dismantled for Insp & Repairs

ML19352A095
Person / Time
Site:	Oyster Creek
Issue date:	03/24/1977
From:	Ross D JERSEY CENTRAL POWER & LIGHT CO.
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION I)
References
LER-77-002-01T, LER-77-2-1T, NUDOCS 8103040413
Download: ML19352A095 (4)

Text

,

UUENSLL tJEN! HL-PUNI jg7 LO*413tOLULOOKl l l l l l

, 1 (pLEASE CEINT ALL AEQutRED INFC AM ATION) 1 LCT PJ' 8 i Nave '

a ctN%C N. mtu si f tvog 7 09 l N f .J l 0 l C l l' l 1 l 14 l0l0l-l0l0l0l0l0l-l0l0l 15 25 l 4 l 1 l 1l 1l 1l 26 l0l1l 00 31 32 Catt004v typt huEr 00Cuf f NuveEA (VENT DAff

' O i ccN r l l l [_j l l 10 l S l 01-l 0 l 211 l 91 k_j3 11 14 17 17 l AlpCAT l 0 l 3 l 2 l 5Afgl 7l 7l 7 8 57 58 59 60 61 60 69 74 75 60 EVENT DESC9;PTION

$ I Stack Gas Sample' Pump "B" 7 89 tripped on Monday, March 14, 1977, at approximately 11:43 AMl 60

@ l and agaln on Tuesday, March 15, 1977, at approximately 1:35 AM. Sample Pump "A" 7 09 l b ! was out in service af ter each incident.

7 R9 For a period totaling 7 minutes for both 80 l

o 80 I incidents, the ' stack was not monitored for radio gases released, in violation of 7 89 .

l o l Technical Specificat ions, paragraph 3.6. A.3 (50-219/77-2-IT) ej 7 89 sestru causF Ce*5rNr CCCE CODE Coccow Nr Covf'ONINT Cnor supptte man vre.Cri tir A

@ lMlCl lEl 7 89 10 lV lA lLI VI El Xl [L_) lXl919l9l votatos lYl 11 12 17 43 44 4; 48 CAUSE DESCrdPTION

• O 7 89 l Af ter the second trip-out. Sample Pump "B" was removed from service and dismantled l 60 7@l 09In the shop. The cause of trip was attributed to tL*. failure of a diaphram operated l to l valve in the lubricant recirculation system for the pump. The pump was replaced with l 7 e9 e AcA.i v utenco o, (SEE BELOW) 60 status  % ' ME A OtwtA STATUS OGCOvt My DiSCOVEAf OtSC&pfCN 7 8 1

9 W 10

[0_7l2l 12 13 l NA l' W l Low Flow Alarm l 44 45 46 80 ACTMTV PON t e N r Hf L E ASf Q OF AMOUNT OF ACINIf f l LOCA7CN OF ACLLA$(

7 8

[.G_j -

9 (Z]OILE ASE No lincrease l~ l Stack l 10 11 44 45 PEASCNNEL EXPOSuAES 80 NUMBE A tvrF DESCP'pf0N

@ l010l 0l 7 89

[ZJ l NA l

11 12 13 60 PERSONNEL INJUMIES NuMEEA DESCR4pTON 1

l 0 l 010l l NA 7 O9 11 12 l 00 Probr.ble Consequences

• hl 7 09 NA l

LOSS DA DAMAGF YO FACILITY

' 60 typt otSCitpf CN h [_]

? 89 10 l NA l

00 PUOLICITY

@l 7 09 NA 1 ADDITIONAL FACTOnS 3 l (CAUSE DESCRIPTION continued) a spare. A standby pump automatic start feature is l

1 09 80 3l being investigated.

1 89 l 80 NAME: Donald A. Ross, Manager-Generating PHONE.201-539-6111

.,o ,,,...,

l f ... -. - ... Stations-Nuclear. - - - - . - - .

i . s LiULNSEL id/LNI I ttl>Ui n CUh 3 8 806 ULUCR / l 7Q.!51F meast Pami au. acouinco mFoami.cr.

I' t L'C3 4'd l t v.t reit EvtNt NAY1 lit'( NSC N4 * *ief it typ[ yypg

@ lNlJl0lClPllj 7 H9 14 l0l0l~l0l0l0l0l0l-l0l0l IS 25 l ,1 l 1 l 1 l 1 l 1 l 30

[ol1l 2G 31 J2 It[ PO n f 64f t'Ofit CatrGUAV sounr E DOChET NL v0f,A (vtNT CAff A(DCAT o i COrri l l l [fvp' y l0 l 5 l 0l-l 0 l 2l 1 l 9l U3 l1 l4 l7 l774l l 0 l 3 l 2 l kAf(l 7l 7!

7 8 57 68 59 60 61 60 69 75 00 LVLNT DESC9h{rff) gf C . I Stack Gas Sample Pump "B" tripped on ;hda, , March 14,J 077, c.: _r; m imtelv -li nMi 7 oQ -

@ l aud again on Lc:;-,, March 15r-M'7. 2 "*m im o 1" 1 35 M. Sample Pump "A" 7 09 99 0 l was out in service af ter each incident. For a _ period totaling 7 minutes for both l 7 ft 9 - 60 0 [ incidents, the stack was not monitored for radio gases released, in violation of l 7 nu e, o l Technical Specifications, paragraph 3.6.A.3 (SC  ?! ,,.., w 7 89 ,,,y, g; s< situ CAuss cou uNtNr covno .%r cece coor couroNI N T coor st.ppu a u w usact.intA scuup,

@ lMl Cl lE l

? 89 10 11 lV l A l L l Vl El Xl 12 17 M 43 44 lXI919l9l 47 j yl 4g CAUSE DESCRIPTION O lAf'--*' - . c : -. d t ' ; m , "_ f ; " . " ^" .wa c...m e ,", _ m . r , m m , Ms.smant. Led.

l 7 e $4 go o U_^-  % The cause of trip was et* 3 the failure of a diaphram operated l 7 09 '

80 t l valve in the lubricant recirculation system for the pump. The pump was replaced with l 7 89 (SEE BELOW) 60 e etii v urts.cc c, m eus s PowsA otst4 status o. scout n oiscovtar ces:norcN 1

7 8 3 10 l0l7l2l l 12 13 NA 44 l' W 45 l

46 Low Flow Alarm 60 l

se r.vit y costiNr ArtEA5fD OF nitt asg AvouNr or ACtNifY LOCATON OF AELLAst 1

7 0

(_QJ .

9 Wl10 11 No increase 44 l

45 l Stack 60 l

PERSONNEL EXPOSUAES NuvotA t vre OtscaipfCN 1

7 89 l 0 l 0l 0]

11 Wl12 13 NA 60 l

l l PERSONNEL INJuluES l NUMat A 0[ 50A.P T ON l 1 l 0 l Cl 0l l NA 7 89 11 12 M Pro';abic Consequences 1

l NA l

/ 89 '

60 LOSS DA DAMAGF TO FACILITY OE stnspf CN 7 89 10 -

8:s PU3LICATY/

]l ,/' NA 1 7 8.2' B3 s

[ AOC' TON AL FACTOGS 3 l (CAUSE DEDh'- -* ?'"J a spare. A standby pump automatic start feature is l l

7 09 60 t

3l being investigated. l 7 89 . 80 N AME: Donald A. Ross, Manager-Generating PHCNE.201-539-6111 Stations-Nuclear so ......,

-~p

4

/7dn ,

I

, ."r  ;

OYSTER CREEK NUCLEAR GENERATING STATION Forked River, New Jersey 08731 Licensee Event Report Reportable Occurrence No. 50-219/77-2-1T  !

5 Report Date .

March 24, 1977 Occurrence Date March 14, 1977 identification of Occurrence Violation of the Technical Specifications, paragraph 3.6. A.3, when the radio gases released from the stack were not continuously monitored. This event is considered to be a reportable occurrence as defined in the Technical Specifications, paragraph 6.9.2.A.2.

4 Conditions Prior to Occurrence Power: Reactor, 1379.6 MWt i

Generator, 465 MWe (9)

Flow

Recirculation, 13 5 x 10 6 lb/hr Feedwater, 5.03 x 106 lb/hr Stack Gas: 11,400 pci/sec Description of Occurrence On Monday, March 14, 1977, at approximately 1143 hours0.0132 days <br />0.318 hours <br />0.00189 weeks <br />4.349115e-4 months <br />, a " Stack Gas Low Flow" alarm sounded in the station control room. Investigation revealed "A" that "B" stack gas stack gas sample pump had tripped. At approximately 1146, sample pump was put in service and "B" stack gas sample pump was isolated.

An electrician was dispatched and found no immediate cause for pump trip and -

at approximately 1201, "B" stack gas pump was placed back in service in order to attempt to repeat the trip or determine the cause of the previous trip.

On Tuesday, March 15, 1977, at approximately 0135 hours0.00156 days <br />0.0375 hours <br />2.232143e-4 weeks <br />5.13675e-5 months <br />, a " Stack Gas Low"B" Flow" alarmed in the station control room. Investigation revealed "A" that stack gas stack gas sample pump had tripped. At approximately 0139, sample pump was put in service. "B" stack gas sample pump Isolated and the

" Stack Gas Low Flow" alarm cleared. An electrician was dispatched and again fcund the pump tripped on thermal overload. The pump was removed and taken to the machine shop for dismantilng to determine the cause.

Apparent Cause of Occurrence The cause for the thermal overload trip was attributed to failure of the diaphram operated valve in the lubricant recirculation system for the pump.

l

- - . _ . _ _ . - - _ _ - _ _ _ _ _ ,_ _ , _ _ _ : ..L ._ _ ,. ..... _ _ _ _ . _ ..-.- _ - _ _ __ _ _ . . . _ _-

\ /Md Reportable Occurrence No. 50-219/77-2-lT Page 2 j March 4, 1977 Analysis of Occurrence The safety significance of this event is considered to be minimal, since

.during the 3-minute period and the 4-minute period the sample system was inoperable, no increases were noted in off gas activity or in area radiation monitor readings. Furthermore, when returned to service, the stack gas monitors indicated the same as they did before the failure. It can, therefore, be concluded that the radio gases emitted from the stack were stable and constant during the period of inoperability.

~

Corrective Action immediate corrective action was to isolate "B" stack gas sample pump and put "A" stack gas sample pump into service. After the second trip, "B" stack gas sample pump was dismantled for inspection and replaced with a spare. An investigation will continue as to the feasibility of an automatic start feature for the standby pump.

Failure Data N/A N

---

e -,