ML20028C203

LER 82-168/03L-0:on 821201,steam Leak Discovered on Pressure Sensing Line for RCIC Instruments DPIS 1E31-N0007B & Ps 1E31-N022B&D.Caused by Failure of Compression Fitting on Instrumentation Steam Pressure Line.Leak Repaired

ML20028C203
Person / Time
Site:	LaSalle
Issue date:	12/30/1982
From:	Houston R COMMONWEALTH EDISON CO.
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION III)
Shared Package
ML20028C184	List: ML20028C183 ML20028C203
References
LER-82-168-03L, LER-82-168-3L, NUDOCS 8301070197
Download: ML20028C203 (3)

Text

. ma m .m m . m. . . ..m. v...

(PLEASE PRINT OR TYPE AI.1.REQUIREO INFIRMATION) )

CONTROL BLOCK: I l l l l l lh a

!ij l II LI Ll S ! C l 1 l@l 01 01 -1 010 ! 0 l 0 l 0 l- l0 l0 l@l LICENSE NUMBER 25 426 I 11.aCENSE l 0 l 0TYPE  ! 0Jo!@l57 CAT l 6s lg j 4 9 LICENSEE COCE 14 15 wT iij ,gyy l L @l 0 l 5 l 0 l 0 10 13 1768 1369 @l1l210111812

• E'C EVENT DATE 7A

@l1l2l310 73 REPORT DATE l 8 l280l@

8 60 61 COCKET N6MS ER EVENT OESCRIPTION AND PROBABLE CONSEQUENCES h

,j:l l On 12/1/82 at 0530 hours0.00613 days <br />0.147 hours <br />8.763227e-4 weeks <br />2.01665e-4 months <br /> a steam leak was discovered on a pressure sensing line for [ l the RCIC Instruments DPIS lE31-N007B and PS lE31-N022B&D. Redundant DPIS lE31-N013B g

,3, g 1

, ,,g would have performed its design function had a steam line isolation been required. g Redundant PS lE31-N022A&C would have isolated the RCIC Outboard Stean Line Isolation y

,,3, ,

Valve on low pressure as designed. The health and safety of the public was preserved at all times.

, g l

J18l l 1 )

so ;

• EoE "cocY sus $$E cOMeoNENT cOoE sEo*E su'sE2EE

I9) 8 9 l Cl E lh [h l B lh lP lI lP lE lX lX lh Wh [2]h to It 12 13 18 Es 20 REVISIOpe SEQUENTIAL OCCURRENCE PEEPoRT

. REPORT NO. CCOE TYPE NO.

EVENT YE AR

@ RE g LER/RO l _l l1l6 l8 l lpl l0l3l y l t

{

. l218 l 2l 22 23 24 26 27 28 29 30 31 32 MOURS S8 i FOR US. P t.1E MA F RER T METH ,

N c0 l33B lgl34 Zjg P

j Z lg l36Z lg 3 l70 l0 l0 ; 0; 4o gg 41 gg 41 l3Z lg 4

l Z l 9 l 9 l 4g 44 4; 33 CAUSE DESCRIPTION AND CORRECTIVE ACTIONS The cause of the steam leak appeared to be the failure of a compression fitting on the; i !ol l instrumentation steam pressure line. The cause of the failure could not be determined,

,,,g This was an isolated incident. The leak was repaired on 12/1/82 and the switches g

, g were, returned to service. REIC System was tested satisfactorily on 12/20/82 g following a 17 day outage, no 8 e OTHER STATUS On RY OtSCOVERY DESCRff'T10N sA 4 POWER OBSERVATION l I !5j l Bl@ l 0 l 4 l 2 l@l NA l l45Al@las ao

• 12 n **

AETiviTY cOlTENT LOCATION OF RELEASE

r. ELE AS E OF RELE ASE AMOUNT OF ACTIVITY ,

l NA l t is l l Zl NA l

e ltoZ l@ln 44 4s so PERSONNEL EXPOSUR ES NUM6ER TYPE DESCRtPTION

,;l7ll0)0l0l@lZl@l NA l PEmsONN EL inau'a'its NuMsER oESCRIPTION@ -

l.

NA lital.10 .

l0 l0 nl@li2 "

LOSS oF OR OAM AGE TO FACILITY TYFE DESCRIPTION NA e

j

' i91lZlhl e e io 8301070197 821229 NRC USE ONI.Y so

' PDR ADOCK 05000 lclIgfhloESCRi' TION h ess O l es so ll IIllI1ifIIli so. ;;

ee io 357-6761

• o R. Houston P H CN E:. - $

_N_A_v E_Qs Pn E

• Mt EFA

e

\

I. LER NUMBER: 82-168/03L-0 l l

II. LASALLE COUNTY STATION: Unit 1 i III. DOCKET NUMBER: 050-373 1

IV. EVENT DESCRIPTION:

On December 1, 1982 at 0530 hours0.00613 days <br />0.147 hours <br />8.763227e-4 weeks <br />2.01665e-4 months <br /> a steam leak was discovered on a steam pressure sensing line for the RCIC System. The leak affected DPIS lE31-N007B and PS 1E31-N022B&D.

l V. PROBABLE CONSEQUENCES OF THE OCCURRENCE:

At the time of the occurrence the reactor was in the RUN mode producing 1474 MWT, 450 MWE.

l The containment outboard isolation valves for the affected switches, j 1B21-F414A&B, were immediately closed.

Redundant Differential Pressure Indicating Switch 1E31-N013B would have i performed its design function had a steam line isolation been required.

Redundant pressure switches 1E31-N022A&C would have isolated the RCIC Outboard Steam Line Isolation Valve on low pressure as designed. The health and safety of the public was preserved at all times.

VI. CAUSE:

The cause of the steam leak appeared to be the failure of a compression fitting on the instrumentation steam pressure line. The cause of the l

failure could not be determined. This was an isolated incident.

VII. CORRECTIVE ACTION:

The compression fitting was tightened immediately, however, the leak was not curtailed.

The outboard containment isolation valves, 1B21-F414A&B, were then closed to isolate the instruments. The RCIC Steam Supply Isolation Valves 1E51-F063 and 1E51-F008 were also closed.

Work Request L20835 was written to repair the tubing. This Work Request was completed and the pressure switches were returned to service on 12/1/82. The RCIC System was tested satisfactorily on 12/20/82 per

(. LOS-RI-Q3 following a 17 day outage.

l Prepared by: R. W. Houston i

__ _ __ ____ _