05000316/LER-1982-020, Updated LER 82-020/04T-0:on 820401,unplanned Gas Release Detected by Elevated Vent Stack Gaseous Monitor (R-26) Reading.Caused by Small Leak from Seal on East Centrifugal Charging Pump.Coolant Filter Changed

Updated LER 82-020/04T-0:on 820401,unplanned Gas Release Detected by Elevated Vent Stack Gaseous Monitor (R-26) Reading.Caused by Small Leak from Seal on East Centrifugal Charging Pump.Coolant Filter Changed

ML20054D279
Person / Time
Site:	Cook
Issue date:	04/13/1982
From:	Palmer R INDIANA MICHIGAN POWER CO. (FORMERLY INDIANA & MICHIG
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION III)
Shared Package
ML20054D278	List: 05000316/LER-1982-020, Updated LER 82-020/04T-0:on 820401,unplanned Gas Release Detected by Elevated Vent Stack Gaseous Monitor (R-26) Reading.Caused by Small Leak from Seal on East Centrifugal Charging Pump.Coolant Filter Changed
References
LER-82-020-04T, LER-82-20-4T, NUDOCS 8204220517
Download: ML20054D279 (3)

LER-2082-020, Updated LER 82-020/04T-0:on 820401,unplanned Gas Release Detected by Elevated Vent Stack Gaseous Monitor (R-26) Reading.Caused by Small Leak from Seal on East Centrifugal Charging Pump.Coolant Filter Changed

Event date:
Report date:
3162082020R00 - NRC Website

text

7 ~

UPDATE REPORT - PREVIOUS REPORT DATE 4/12/82 l LICENSEE EVENT REPORT

." CdNTROL CLOCK: l l l l 1 I (PLEASE PRINT OR TYPE ALL REQUIRED INFORMATIONI lo t ile elM [Iucessee lD lCcoatIC l 2 l@l 0l 010l Ol 0l 0l 0l 0l 0l 0l a0l@l 4lucessa ll il 111l@l nee ao l

si w 24 lg l i i4 :s uceN3e ~uv ea 26 CON'T l loIiI "jZ l L l@l015101010 l3 l1 16 odl@l69014101 11812l@l 01411131812 14 33 REPORT oATE 40 l@ i 8 60 6i DOCK ET NLMB ER EVENT DATE EVENT DESCRIPTION AND PROBABLE CONSEQUENCES Oto i o !:, [ ON APRIL 1,1982, AN UNPLANNED GAS RELEASE WAS DETECTED BY AN ELEVATED UNIT 2 VENT  !

,oi3i i STACK GASE0US MONITOR (R-26) READING. THIS EVENT CONTINUED FOR SEVERAL DAYS WITH g ITTT1 I LOW LEVEL GASE0US RELEASES BEING DETECTED BY BOTH R-26 IN UNIT 1 AND UNITDURING 2. l io,3i i THIS TIME PERIOD, A TOTAL OF 118.0 Ci WERE RELEASED AT A RATE OF 2.23 E-4 Ci/Sec.,  ;

io is i i WHICH IS 0.382% OF THE TECH. SPEC. LIMIT. THE MAXIMUM RELEASE RATE WAS 2.23 E-3 i j o !;l l Ci/Sec., WHICH IS 3.78% OF THE TECH. SPEC. LIMIT. THIS RELE'.3E OCCURRED WITHOUT THE l

,o,ii SAMPLING AND ANALYTICAL REQUIREMENTS OF TECH. SPEC., APPENDIX B, 2.4.4.E. l 80

' as ^

'l$Ee" 'c^cT! s"eci5e cevacNENT cooe su'aTEoe su"U"eoa Io69! l M l A l@ lE l@ l Bl@ l V ! A l L l V l E l X l@ y@ [P_j @

, e , io ii u u is is ;o ts. ,o ivi~T vey iE'aM i ' CESS!"" "K?"' "'"7

~

• O aEa g l-l l0 l 2! 0] l/l l014l lTl ll l0 l Nu

__ l218122 2l 23 24 J6 21 28 29 Ju 3i 32 T K *A O ON PLANT ET hours S a IT FO us. sUPPLIE MA FA TURER l33A l@l34 Zl@ l33 Zl@ l36 Zl@ l 010l 0l 01 31 40 l Yl@

4i lYl@ lNl@ lGl215l5l@

42 43 44 di CAUSE CESCRIPTION AND CCRRECTIVE ACTICNS h li,;!l INITIAL INVESTIGATION REVEALED THAT A SMALL LEAK WAS OCCURING FROM THE SEAL ON UNIT 2 l

[iiil l EAST CENTRIFUGAL CHARGING PUMP. PUMP ISOLATION REDUCED THE RELEASE RATE BUT DID NOT I

~

i,,,ii RETURN THE R-26 READINGS TO NORMAL BACKGROUND. ON APRIL 7, 1982, THE UNIT 2 REACTOR l

,,,;i l C0OLANT FILTER WAS REMOVED FROM SERVICE FOR A ROUTINE FILTER CHANGE. AT THIS TIME l ii ;,i i BOTH R-26 MONITORS RETURNED TO NORMAL BACKGROUND. (SEE ATTACHED SUPPLEMENT) [

'sr'OEs" snowca ofwea status @ EE?inv' oisc:veny assenierios @

NA l li i 3 l l C l@ l 01 91 9l@l l l A l@l 'RADIATION MONITORING ALARM 8

A TIVITY C TENT actzAsso ce actrAse tocATiem e, nets as. Oss li 16 dl 9l G l @ l NI@l 118.0AuousT to it Ci Xe-133 cr AcTiviiv 44 4%

@ l BUILDING VENT TO ATMUSPHERE l AUXILIARY 60 l

PEAsONNEL ExPQsuRES NUV86R Tv'E C EsCRIPTION ^

l i j 7 I l O l 0 l 0 l@l Z {@l NA l

> - * ...sc~ a ',s a , " ao suu..a otseni,rio~@ NA li!-ll010!Ol@l

. . 2 o u .a l

'S'. ' Us'c"2'c's '"" @

T NA l I. i I e, l ,I Z l@l,o ..

issuf tu.u i N i@OISCR',T,0N l nA i ii !itiviiiiili hggad8h'488% A. PALMER PHCNE:

S

4 s

l l

ATTACHMENT TO LER#82- 020/04T-0 SUPPLEMENT TO CAUSE DESCRIPTION ON APRIL 1, 1982 AT 2100 HOURS, UNIT 2 VENT STACK GASE0US MONITOR (2-R/26)

INCREASED RAPIDLY. INVESTIGATION IDENTIFIED A SMALL LEAK ON THE UNIT 2 EAST CENTRIFUGAL CHARGING PUMP SEAL. THE PUMP WAS ISOLATED AT 1900 HOURS ON APRIL 2. AT THIS TIME THE GASE0US RELEASE RATE DECREASED AS SEEN ON 2-R/26 BUT DID NOT CAUSE THE MONITOR TO RETURN TO ITS NORMAL BACKGROUND.

INVESTIGATION CONTINUED BY CHECKING ALL LIQUID DRAIN VALVES. THIS WAS DONE BECAUSE THE LIQUID 0FF-GAS MONITOR (R/22) WAS PERIODICALLY INDICATING HIGH RADIOGAS ACTIVITIES IN THE WASTE HOLDUP TANKS AND SUMP TANKS.

ON APRIL 7, i982 AT 0855 HOURS, THE UNIT 2 REACTOR COOLANT FILTER WAS ISOLATED TO CHANGE THE FILTER CARTRIDGE. SHORTLY AFTER THE FILTER WAS ISOLATED R/22 AND R/26 IN BOTH UNITS RETURNED TO NORMAL BACKGROUND. AFTER THE FILTER WAS REPLACED AND RETURNED TO SERVICE GASE0US ACTIVITIES AT R/22 AND R/26 IN BOTH UNITS AGAIN WERE ELEVATED. THE FILTER WAS AGAIN ISOLATED AND ALL MONITORS RETURNED TO NORMAL.

EXAMINATION AT THE UNIT 2 REACTOR COOLANT FILTER DRAIN VALVE (2-CS-381) SHOWED

~

THAT THE VALVE STEM HAD BEEN TWISTED AND THE DIAPHRAM WAS TORN. THIS CAUSED LIOUID TO LEAK PAST THE VALVE SEAT TO THE CLEAN SUMP TANK AND ALSO TO ATMOSPHERE AT THE FILTER. THESE LEAKS CREATED RADIOGASEOUS ACTIVITY AT R/26 IN BOTH UNITS AND R/22.

VALVE 2-CS-381 IS SUSPECTED OF HAVING BEEN DAMAGED ON A PREVIOUS FILTER CHANGE WHICH TOOK PLACE ON MARCH 30, 1982.

VALVE 2-CS-381 HAD BEEN CHECKED TO BE IN THE CLOSED POSITION EARLIER IN THE INVESTIGATION BY INSURING THAT THE REACH R00 FOR THE VALVE WAS NOT PARTIALLY OPEN. THIS TYPE OF CHECK WOULD NOT HAVE IDENTIFIED THAT THE VALVE HAD FAILED; THEREFORE, THE FAILURE REMAINED UNDETECTED UNTIL THE FILTER WAS REMOVED FROM SERVICE. DISASSEMBLY OF THE VALVE CONFIRMED THE FAILURE.

l

r

.i SUPPLEMENT TO CAUSE DESCRIPTION (Continued)

THE TOTAL RELEASE DURING THIS TIME PERIOD FROM BOTH SOURCES: THE 2-EAST' CENTRIFUGAL CHARGING PUMP AS WELL AS THE REACTOR COOLANT FILTER DRAIN VALVE FAILURE WAS:

TOTAL 1.18 E2 Ci of Xe-133 2.28 E-4 Ci/Sec 3.82 E-1  % Technical Specification THE MAXIMUM RELEASE RATE DURING THIS PERIOD WAS:

2.25 E-3 Ci/Sec 3.78 E0  % Technical Specification e

k

.- - - . . , , - . . - i

_ _ _ . _ _ _