05000237/LER-1982-009

LER 82-009/03L-0:on 820317,refuel Floor Hi Rad Surveillance B SBGTS Failed.A SBGTS Did Not Start Upon Failure of B. Caused by Blown Gasket on Foxboro Controller,Model 130M. a SBGTS Failure Due to Short Initiation Signal

ML20054D174
Person / Time
Site:	Dresden
Issue date:	04/13/1982
From:	Anandappa A COMMONWEALTH EDISON CO.
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION III)
Shared Package
ML20054D169	List: 05000237/LER-1982-009, Forwards LER 82-009/03L-0
References
LER-82-009-03L, LER-82-9-3L, NUDOCS 8204220409
Download: ML20054D174 (2)

LER-2082-009,

Event date:
Report date:
2372082009R00 - NRC Website

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, , LICENSEE EVENT REPORT

.h CONTnCL BLOCK: l l l l l l l (PLEASE PRINT OR TYPE ALL REQUtnED INFORMATIONI l o l 81.l9 l I l UCENSEE 7 L l D lCCOE R l S 14l 2 l@l 010 l - l 0uCENSE is l0 l NUMBER 0l 0 l 0 l - l 01015l@l26 4 l uCENSE 1l 1 l TYPE1l 140l@l57 CAT l Sa l@

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60 61 GoCX ET NUMSER 68 69 EVENT QATE 74 75 R EPCRT C ATE do EVENT DESCRIPTION AND PROSASLE CONSEQUENCES h 10121 l During normal operation while performine DIS 1700-7, the Refuel Floor Hi Rad Surveillancej i o I a l l "B" SBGTS failed when an auto initiation signal was given. The "A" SBGTS was in standby l 9 o l4; lbut did not start upon failure of "B" SBGTS. The "A" SBGTS started on a manual initia- l 1oisI l tion. There was no effect to public health and safety. This event is of minimum safety l lo is l l significance because the redundant "A" SBGTS was found to be operable. Previous similar g ga;7; joccurrence reported by R.O. 81-72, 80-35, 79-65, 79-62, and 79-53 on Docket 50-237.  ;

t o ta l ! I 7 8 9 80 SYSTEM CAUSE CAUSE COMP. VALVE CCOE Coct SUSCCCE COMPONENT CCCE SU8CCCE SUSCCQE loist 7 8 9 l S lC l@ l E lh l Elh l I l N l S lT lR lU lh lC lh l Zlh to 11 12 13 18 , 19 20

,. SEQUENTIAL OCCURRENCE REPORT REVI$loN LE R/Ro EVENT YEAR REPORT No. CCOE TYPE No.

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_,21 22 l_l 23 l 0l 0l 9l 24 l/l l Ol 3 l l Ll l-l l0l 26 27 28 29 30 31 32 N AcTlc oP T M TW Hours S5 ITT PCR S. SU U MANUF MER lAJ@l2_J@

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ao el 42 43 de 47 CAUSE DESCRIPTION AND CORRECTIVE ACTIONS l1 i o I l The cause of "B" SBGTS failure was a blown easket on Foxboro Controller. Model 130M. Thei I1 Iil Igasket was replaced and the "B" SBCTS tested satisfactorilv. The "A" SBGTS failure was  !

Iii2I ldue to the initiation signal not being maintained long enough to complete timer actuation.I l l,g3, l The test procedure is being changed to maintain the trip signal for 30 seconds. In the [

i,,,j l future, to decrease system downtime, defective controllers will be replaced with spares. l 7 a s so "sYM"s sPowER oTNER status @ $isEcNRy oiscovERv cEsCRirTioN @

[1 l 5 l l E lh l 0l 9 l 912l@ln N/A l l B l@l Surveillance Testing l 7

ag ig 44 4s a so (ELEAsto on RELEASE LocAricN c,P RELEASE @

lt is l W g ]gl AMouu?cp N/A Activity @l l N/A l 7 8 9 10 11 44 46 30 PERSONNEL EXPCSUREs NUM8ER TYPE CESCRIPT1cN l,jyj l 0l 0 l 0 lgl Z lgl N/A l

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• N l l a l l 0 luMgERl 0 lgloEsCRiPTio~@ N/A l 7 8 9 11 12 L'JS3 op om OAMAGE To PACIUTY 80 l TYPE DESCRIPTION l1 l 9* I*l Z lhl'O N/A l 7

8204220409 820413 a0

,33 **"C',"ca,,riou o @ PDR ADOCK 05000237 NRC USE ONLY ,

S PDR i712 l8a9l I khl to N/A  ; lg;;,g,,,,;,l:

68 69 30 1 A. Anandappa NAME OF PREPARER - 8 HONE: 815-942-2920, X-421 0 g j

<> DEVIATION REPORT (a Commonwealth Edison DvR NO.

n-STA 2/3- 82 UNIT YEAR 15 .

NO. I PART1l TITLE OF DEVI ATION OCCURRED 3/17/82 1329 Failure of "B" Standby Gas Treatment System caTr nvr SYSTEM AFFECTED 7500 PLANT STATUS AT TIME OF EVENT U 0 U 0 TESTING SBGTS MOcE . PwRtM#T) U-2 2302 . LOAD (MAE) U-2 821 O 3

DESCRIPTION OF EVENT At 1329 while doing the Refuel Floor Hi Rad. Surveillance (DIS 1700-7),

"B" SBGTS failed when given an initiation signal ("B" SBGTS was in primary). The fan started but the suction damper (AO-2/3-7510B) failed to open thus there was no flow through the system. The "A" SBGTS failed to start automatically but was started manually at 1330.

(It's control switch was in standby). At 1425, "A" SBGTS was stopped, the control switch put in primary, and an automatic initiation signal was generated from U-3 Refuel Floor Hi (over) 10 CFR50.72 NRC RED PHONE O E NOTIF l" ATION MADE YES NO EQUIPMENT FAILURE D 19330 YES NO AORK REOUE ST NO. RESPCNSIBLE SUPEQvfSOR . .ietryga OATE 3/17/82 P ART 2 l 0PERATI NG ENGINEER'S CO*WENTS "A" SBGT system was started within the two hour time limit to prove operability. The I.M.'s started troubleshooting and repairs on the "B" SBGTS immediately. "A" SBGTS failed to start in standby because the I.M. conducting the surveillance did not leave the inicia-tion signal in long enough to allow the timer to time out (greater than 20 sec.).

EVENT OF PUBL IC IN TERE S T 2 4- HOUR NRC NOTIF ICATION RE0'D M. Jordan (courtesy) 3/17/82 1530 0 TECH. SPEC. v10LAT10N TELEPH REGION III DATE TIME O NoN aEPoaTABLE OCCURRENCE TELEGM/TELECOPY O i A oAv REPoaT Aa'E'T S. REoioN iii oATE TIME 6.o.s.z.t

{ 30 DAY REPOR T A BLE / T. S.

ANNUAL /SPECL REPORT RE0*D O CECO CORPORATE NOTIFIC ATION MADE IF ABOVE NOTIFICATION IS PER !OCFR21 A.I.R. -

O s-oAv aRI TTEN REPORT REQ'D PER 10CFR21 L.E.R. f2-09/03L-0 TELEPH F. A. Palmer 3/19/82 0840 Ceco CORPORATE OFFICER DATE TlVE PRELIMINARY REPORT COMPLE TED AND REVIEWED John M. Almer 3/18/82 uPERATING ENGINEER DATE INVESTIGATED REPORT 4 RESOLUTION ACCEPTED BY STATION REVIEW L h'- { ,,

O v4s /rs. . [ ' . -

N R[sotyTg0N APPROVED AND MIM AUTHORI ZED FOR O t S TRI BU TION

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