ML20028C137

LER 82-166/03L-0:on 821126,drywell CAM Sample Pumps 1PL15J & 1PL75J Continuously Tripped Off.Caused by Combination of Leaking cross-tie Valve & Internal Electronic Interference. Valve Will Be Replaced & Procedures Revised

ML20028C137
Person / Time
Site:	LaSalle
Issue date:	12/21/1982
From:	Arand J COMMONWEALTH EDISON CO.
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION III)
Shared Package
ML20028C133	List: ML20028C132 ML20028C137
References
LER-82-166-03L, LER-82-166-3L, NUDOCS 8301070102
Download: ML20028C137 (2)

Text

- - - - - - - -

(

coNinCL CLCCK: l

. . i l l } } } ]@

4 (PLEASE PRINT OR TYPE ALL RCQUIRED If4FORMATIONI (i]I WLlLl5lCl1 l@l 010 l - l 010LIOkNSE j 0 lN6MJE 010 A l- l Ol 0IS l@l 4 luCENSE ;5 1 l0 l0 !0 !@[53 C {A T ialg TYPE 40 a g Lice.;EE CCOE 14 15

] y,"g"y f l L }@l 01 5 l 0 l 0101317 54I 3 @l td 1EVENT l1 12 DATE 16 l 812 74

@l 75 iIREPORT 21211 DATE

!812EOl@

3 f,0 68 00:4E7NwuSER EVENT DESCatPTICN AND PRCSA3LE CCNSECUENCES h

g l On November 26, 1982 at 1958 hours0.0227 days <br />0.544 hours <br />0.00324 weeks <br />7.45019e-4 months <br /> with the plant at approximately 45% power both [

dryuci l Cati's IPL15J and IPL75J sampic pumps continuously tripped off. Since the j g

g primary containment sump flow monitoring systen and the P.C. air coolers condensate l flow rate moni toring systems "were moni toring leakage in accordance with T.S. 3.4.3 1, j the health and safety of the public was not affected.

I 79 I m.

I ia l i 80 3 9 CAutt CDMa*. VAlviE SYSTUA CAUSE CCCE CODE SuSCCOE COMPCNENT COCE Sua:: ODE SUSCCoE 13]

l 5 lC l@ l El@ l 2l@ l V l A l L l V l E lX l@ W@ [D 3 10 13 12 13 18 is 20 ( @

SECUENTI AL CCOUR R ENCE scPonY REVIStOf8 EVENT YEA A REPORT No. CCOE TYPE N o.

tep

@ ,ago,fgogI8l2l l-l li 16 16 l l/l I 01 31 IS 29 I ti 00 l-l 31

[ 0_j 22 22 23 24 ;6 27

_ 21 CCV7CidENT SHUTOOWN ATTACHMENT NPR M FRlME COMJ*.

ACTION FUTUAE EFFECT FCRM hug. SUPPU ER MANUFACTURER TAKEN ACTicN ON PLANT METHCO HOURS SU8 MITT E D l DI@l04 G g gg lOSZl@

l 0l 0l 0 31 l

40 lYl@

41 yg 42 l A lg 43 l Z l 9 } 9 l 9 lg 44 47

S CAUSE DESCRIPTION AND CCRRECTIVE ACTIONS h

,;3j j The cause was apparently due to the combination of a leaking cross-tic valve ]

I

3 j l (10!i036) and internal electronic interference. The cross-tie valve (ICM036) is premntly in the process of being replaced under work request L20763. Three radiation g pioce.dures (LRP 1350-20, 21,'24) are currently being revised to help prever t elec- l tronic interference problems. g

, g sa a a

% PCWER CTHER STATUS 65 RY COVCRY QCSCatPTICN ST RAD CHEM OBSERVATION l i 5 ] LB_j@ l 0 l 4 l 2 l@l NA l l Al@l A CTivlTY CO TENT LOCATION CF PELEASE AELEASC: AVOUNT OF ACTIVITY NA l g W @' CF *tCLEASElZl@l NA l 44 l

45 60 8 ) to 11 PER$CNNEL EXPCSVRE3 NUvetA TYPE C E 3CRIPTICN --

NA l i 17] l 0 l 0 l 0 l@lZ '

l@l so Pc s scNst L iN;Ud ts 8301070102 821222 eEsCRirTioNh PDR ADOCK 05000373 g l0l0l0lgl Nuvstn NA s PDR [

63 t 9 11 12 LC!S OF O A OAM ACE TO F ACILITY Q Ty cu:niPTioN O .

NA .l 19] U.ft@l 2

. ia g e.sy t OE AIPTION llIIIililIIII,I

. i1, ,W hl NA I es se ca. :

John Arand (815) 357-676F m s:.v o c pp fy__:.R c n_ - mcuE: y

pa

l. LER HUMBER: 82-166/03L-0

11. LASALLE COUNTY STATION: Unit I lit. DOCKET NUMBER: 050-173 IV. EVENT DESCRIPTIO!!:

On November 26 at 1958 hours0.0227 days <br />0.544 hours <br />0.00324 weeks <br />7.45019e-4 months <br /> with the plant at approximately 45% power both drywell continuous air monitors (IPL15J and IPL75J) sample pumps were found to be continuously tripping off. The radiation / chemistry dept. was notified to begin their sampling once every 24 hours2.777778e-4 days <br />0.00667 hours <br />3.968254e-5 weeks <br />9.132e-6 months <br /> for noble gas and particulates as per T.S. 3 4.3.1.

V. PROB 6BLE CONSEQUENCES OF THE OCCURRENCE:

Since the primary containment sump flow monitoring system and the primary containment air coolers condensate flow rate monitoring systems were monitoring leakage in accordance with T.S. 3.4.3.1, the health and safety of the public was not af fected.

VI. CAUSE:

The cause of the drywell CAM's tripping was apparently due to a leaking cross-tic valve (ICM036) and internal electronic interference. The above combination caused a high flow trip while in the auto mode.

Vll. CORRECTIVE ACTION:

The cross-tie valve (ICM036) was torqued closed approximately four hours af ter the initial trip and is presently in the process of being replaced under work request L20763 Three radiation procedures (LRP 1350-20,21,24) are currently being revised to run the monitors in the manual mode where less electronic interference problems seem to occur.

l Prepared by: J. Arand l

l l

l l

l