ML17252B560

LER 78-036/03L-0 for Dresden, Unit 2 Re Correction to a Typographical Error in the Attachment to the Original Report

ML17252B560
Person / Time
Site:	Dresden
Issue date:	07/28/1978
From:	Stephenson B B Commonwealth Edison Co
To:	Keppler J G NRC/RGN-III
References
BBS LTR 1085-78 LER 78-036/03L-0
Download: ML17252B560 (5)

Text

e Comm9'ealth Edison Dresden Nuclear Power Station R.R. #1 Morris, Illinois 60450 Telephone 81.5/942-2920 BBS LTR 111085-78 G. Keppler, Regional Director .<. Directorate of Regulatory Operations -Region III U.S. Nuclear Regulatory CommissioI). 799 Roosevelt Road Glen Ellyn, IL 60137 r----*\ ,, co Licensee Event Report II 78-036/03L-0, Docket II is her*:by resubmitted to your off ice to correct a typographical error i:n the Attachment to the original report. The applicable sentence i:n the Attachment should have read failure of .the fuse was probably1 caused by a dirty relay contact or by deterioration of the fuse". No other changes have been made' in the report. This event was reported to your off ice under Dresden Nuclear Power Station Technical Specif 6. B. 2. (b), conditions leading to operation in a degraded mode permitted by a limiting condition for. operation or plant shut:<fown required by a limiting condition.for operation

• Enclosure

• St phenson Station Superintendertt Dresden Nuclear Power Station cc; Director of Inspection & Enforcement Director of Management Information & Program Control File/NRC JUL 2 8 1978 ,. ' (: '"'"'1 c":*c:s ri-i-* ... ;::: ::-0 -iC.:: --l 00 ' l A ,,., ej*' \' f I I i l 1 'rr-m LICENSEE EVENT REPORT * , CONTROL BLOCK: ..., .... __ __._ _ _.____,j Q (PLEASE PRINT .VPE ALL REQU,RED INFORMATION). . ' . I I I LI D I R I s I 2 101 0 I 0 I -I 0 I 0 I 0 I 0 I 0 I -I 0 I 0 1014 I 1 I 1 I 1 I 1 101 I . , 0 7 8 9 LICENSEE CODE 14 15 LICENSE NUMBER . 25 26 LICENSE TYPE JO 57 CAT SB CON'T "[IE] L!'.J©I o I s I o I o Io I 2 I 3 I 1 101 o I 6 Io Is I 1 I s '(D[_Q_J_1 I a I s I 1 Is IG) 60 61 DOCKET NUMBER 68 69 EVENT DATE i4 75 REPORT DATE 80 7 8 EVENT DESCRIPTION AND PROBABLE CONSEQUENCES@ CQ::ill I On June 5, 1978, while Unit 2 and 3 were in normal operation, 1tA1 _SBGT failed to [£ID st."'* _ up_,n auto initiation from a spurious reactor bldg. Hi Rad signal. 'B' SBGT [QB I auto started sud::essfully. A tubing in the flow .control panel was found broken. The [QJ}] flow control damper was left wide open until. new tubing could be obtained. On June 9, 1978, 'A' SBGT again failed to start upon auto initiation and 'B' SBGT auto I started. Since the redundant system was available the safety significance of these [9J]J I events was minimal.* This event is not repetitive. 7 8 9 SYSTEM CAUSE CAUSE COMP. VALVE CODE COLlE SUBCODE COMPONENT CODE SUB CODE SUBCODE I s1 cl@ 11 IN 1s IT IR 1u 1@ 7 8 9 10 11 12 13 18 19 20 SEQUENTIAL OCCURRENCE REPORT @ LER'RO LVENT YEAR REPORT NO. CODE TYPE REPORT I 7 I 8 I l==.l lo 13 I 6 I lo I 3 I w l=1 NUMBER 21 22 23 24 26 27 28 29 30 -: JI ACTION FUTURE EFFECT SHUTOOWN r.;:::i ATTACHMENT NPRD-4 PRIME COMP. SUl'PLI ;:R REVISION NO. l9_J 32 COMPONENT t.IAt-IUFACTURER 80 TAKEN ACTION ON PLANT METHOD .HOURS SUBMITTED FORM !>US. *W@W@ W@ W lo lo lo lo I LU@ LU@ 33 J4 JS JG J 7 40 41 42 Lu@ Ii I 9 I 9 19 I CAUSE DESCRIPTION AND CORRECTIVE ACTIONS @ 43 44 47 I After the second failure a blown fuse was found which tripped the train on. auto start* I It was replaced and the train was auto started and ran successfully. Apparently the first failure was also caused by this blown fuse. Because of the singularity of IT.ill I this event no fut:ure corrective action is deemed necessary. __J ITEJ 7 8 9 80 FACILITY STATUS %POWER OTHER STATUS l2EJ LU@ I 0 I 8 I 6 l@I U3 at 55% 8 ') 10 12 11 ACTIVITY CONTENT Q\ RELEASED OF RELEASE AMOUNT OF ACTIVITY '2_V METHOD OF . (.:;::;\ DISCOVERY DISCOVERY OESCRIPTION ______ 4S 46 44 LOCATION OF RELEASE@ 80 NA IBJ @) 7 8 9 10 11

• PERSOWvEL EXPOSURES

• r1u1,1BER A TYPE DESCRIPTION@ 44 45 80 J *[IE] Io I a loJl.EJ@ NA J 8 11 12 PERSOllNEL INJUntES 80 DESCnlPTION@ [Q3J I 0 I 0 I 0 I@ NA 8 9 11 . or OR D/\r..IAGE TO FACILITY Q TYPE OESCfHPTION . * [Q2J W@ NA a 9

• ______ _ PUOL!CITY so "' NRC USE ONL y 11/1111 II I I NAME OF PREPARER ____ J_o_e_C_l_la_n ___________ _ 6B 69 265 PHONE:_.___. _________ __;__ 80*;; 0 0. " *' .*

• ATTACHMENT TO LICENSEE EVENT:REPORT 78..;,036/031.-0 COMMONWEALTH EDISON COMPANY. (CWE) 'DRESDEN UNIT..;,2 DOCKET* /1 050.,.:.237 On June 5 1978 during normal plant operation, A *SBGT system failed 'to start upon auto initiation from a spurious Reactor Building ventilation radiation* monitor* trip i * "B"

• train auto started when the ."A" train failed to supply the required flow rate. "B tra*in operated fo:r 10 hours1.157407e-4 days <br />0.00278 hours <br />1.653439e-5 weeks <br />3.805e-6 months <br /> which proved its operability as by Tech. Spec: 4.7.B.l.a. It was determined that the flow through the "An tratn was low because the blower suction valve was. slow to open, An investigation revealed that a piece of tubing in *the flow control panel was broken causing the valve to open slowly. The "A" train blower suction vah,re was manually placed in the full..open position and the "A" train was declared operable after it was manually started and run successfully for 10 hours1.157407e-4 days <br />0.00278 hours <br />1.653439e-5 weeks <br />3.805e-6 months <br />. The valve will be left in the full open position until replacement tubing can be obtained and installed, Since the redundant train auto started and ran successfuliy, the safety significance of thd.s event is minima.I. On June 9, 1978, the "A" SB(;T failed to start*againupon auto initiation when the Unit 3 irn'!trument bus was deenergized. B" SBGT auto::_sta:rted and ran successfully for 10 hours1.157407e-4 days <br />0.00278 hours <br />1.653439e-5 weeks <br />3.805e-6 months <br />. It was then found that .a fuse in the heater operation sensing circuit was blown which prevented the auto start of the train, The train is designed to trip upon auto start if the heater fails to operate, but is not tripped upon manual start by this fuse *failure, The fuse was replaced and the train was auto started and ran successfully. The failure of the' fuse was probably caused by a dirty relay contact or by deterioration of the fuse. The relay contact was cleaned and properly adjusted, The fuse is manufactured by BUSS. Apparently both.failures were due to the blown fuse, Because*of the .singular nature of this event no further corrective action is deemed necessary, REPORT .. *.***@ . Commonwealth* Edison

• NO.STA UNIT YEAR PART1(TITLE OF DEVIATION 2/3 11A11 S.B.G.1 .S SYSTEM AFFECTED Standby Gas Treatment 7500 DESCRIPTION OF EVENT D 2 I PLANT CONDITl°ljJ_?2 MODE RUN U-3 PWR(MWT) 2191 1421 LOAD(MWE) OCCURRED 6/5/78 691 443 DATE 0230 TIM: TEST! NG D IBZJ, YES NO 2/3 A s.B.G. DESCRIPTION OF CAUSE Suspect inlet damper 2/3-7505 'K' did not open in required time to allow proper flow. APPLICABLE INFORMATlbN Started 2/3 "A" S.B.G manually & 2/3 7505 'N'valve very slow opening: Commenced DOS7500-2 2/3B nnPr'-'1-,; li rv (1 OHR RUN) EQUIPMENT I XX! YES DR NO. FAILURE CJNO NA WR NO. 4691 H.R. Whitehead 6/ 5/78 . RESP_ONSIBLE SUPE'RVISOR . DATE PART 2 OPERATING ENGINEERS COMME:NTS B SBGT train proven operable per tech spec. Investigation in progress as to cause SAFETY-TYPE OF CEVIATION EVENT OF POTENTIAL TECH SPEC NON-REPORTABLE ANNUAL RELATED REPORTABLE OCCURRENCE PUBLIC INTEREST VIOLATION OCCURRENCE REPORTING WR ISSUED D 14 DAY D 10CFR2 I GJ .,0 DAY NOTIFICATION D v 6.6.B.2.b REPORTABLE CCCURRENCE ACTION ITEM NO. NUMBER 50-78 031-0 NA 24-HOUR NRC NOTIFICATION DTPH .. Nti. *REGION I I I DATE TIME DTGM l\T A REGION 11 I & DOL CATE TIME -RESPONSIBLE COMPANY OFFICER INFORMED OF 10CFR21 CONDITIO'lS AND THE! R REPORT TO NRC REJIEW AND COMPLETED ACCEPTANCE BY REVIEW AS REQUIRED DATE RESOLUTION APPROVED AND AUTHORIZED FOR DISTRIBUTION 1***77 <.FORM 1S*sz*t) YES 0 YES Ci] D .. D NO D NO D PROMPT ON-SITE NOTIFIC.l1TIC,;.; A. Roberts Assist *supt 6/5/78 1600 TITLE DATE TIME NA TITLE DATE TIME PROMPT OFF-SITE NOTIFICATION F.A. Palmer 6/8/78 1020 TITLE DATE TIME J.R. Gilliom 6/808. 1020 TITLE DATE TIME 1 IME 1/toha DATE -<

• e DEVIATION RE"PORI * *commonwealth Edison DVR NO. .

• STA UNIT YEAR NO. D-12 -2 .-73-71 .. OCCURRED 6/9/78 0811. DATE TIM: PART 11 Tl TLE OF DEVIATION 'A' Standby Gas Treatment Train SYSTEM AFFECTED PLANT CONDITIONS TESTING D Standby Gas Treatment 7500 MODE RUN PWR(MWT) 2060 LOAD (MWE) 677 YES NO DESCRIPTION OF EVEN: U3 Rx scrammed, A standby gas treatment train auto started -it tripped & B train auto started ..

• DESCRIPTION OF CAUSE Cause of trip unknown -may not have gotten flow up in time. APPLICABLE INFORMATlbN Tmmedjately performed JO hour s1irveil1ance run on "B" SGTS train_to demonstrate operability. EQUIPMENT WW YES DR NO. FAILURE ONO NA WR NO. 4839 Victor B. Rockovski 6/9/78 RESPONSIBLE SUPl'RVISOR DATE PART 2 I OPERATING ENGINEERS COMMENTS "B" SGTS train evailable to rpovide containment boundary for the reactor building as designed Train wj 11 be tested dai 1 y for 7 days or untj 1 the return of "A" train to service SAFETY-TYPE OF DEVIATION EVENT OF POTENTIAL TECH SPEC NON-REPORTABLE ANNUAL RELATED REPORTABLE OCCURRENCE PUBLIC INTEREST VIOLATION OCCURRENCE REPORTING WR ISSUED D 14 DAY D 10CFR2 l W 30 DAY NOTIFICATION D 6.6.B.2.6 REPORTABLE CCCURRENCE ACTION ITEM N0. NUMBER 5o-78 36 -03L-0 NA 24-HOUR NRC NOTIFICATION DTPH NA .REGION I I I. DATE TIME DTGM Nt. REGION I I I & COL CATE TIME RESPONSIBLE COMPANY OFF! CER INFORMED OF 10CFR21 CONDITIONS AND THE! r1 REPORT TO NRC RE /I EW AND COMPLETED ACCEPTANCE BY REVIEW AS REOU I RED I DATE RESOLUTION APPROVED AND AUTHORIZED FOR DISTRIBUTION* 10* 77 I.FORM' IS* *;z-ti YES GJ YES GJ D D NO D NO D PROMPT ON-SITE NOTIFICATION B.R. Shelton for B.B.S. .6/9/78 0830 Tl TLE DATE TIME NA TITLE DATE TIME PROMPT OFF-SITE NOTIFICATION F.A. Palmer 6Ll2L78 1410 Tl TLE DATE TIME .! I Gilliom* 6L 1208 1410 TITLE DATE TIME . TITL_b DATE R.M. .. oPERATING ENGINEER DATE 7/Joha SUPERINTENDENT DATE