ML17252B537

LER 80-046-00 for Dresden 2 Regarding a Failure to Receive CRD Volume During a Reactor Scram

ML17252B537
Person / Time
Site:	Dresden
Issue date:	12/30/1980
From:	Commonwealth Edison Co
To:	NRC/RGN-III
References
LER 80-046-00
Download: ML17252B537 (2)

Text

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REQUIRED'INFORMATIONI l ' ' ' ' ... . . *1 . *: .. . 6*;.. .. . ' .' "* ' " ... , .. . .. ' ' .. ' ' "' '. . ' lEJ.:r rf 11 D:j. Rr,:s I; o:fo**

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74 75.. REPORT CATE ; ' 80:

• EVE.NT'DESCRIPTION*ANO PROBABLE.CONSEQUENCES@

'.. . . . ,..: ..,..o .... l"""2""'j'.'IDuring

• a* reactor'*s*cram, failed *to receive CRD volume : HI,;_Hi Ievei: alarm*.*

The' saf'ety*

L . I . . . . . . . . . *. . . . . . . .

.. ::nIJ. lsignifiCance*

1of this since 'it did. n_ot affect* the scram' function.

and

• l : 0 j 4-. r jthe scram*

instrument*

level switches

.. wete opetab*le<.

Public health* and F ' : 0 ! s.r. 1'safety were Jlot:

This *iS* the. first. occurrence of' this :type at L' :o

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rs so* . . SYSTEM'.

CAUSE:. 1* CAUSE*. COMP, VALVE'* CODE:* CODE' ' ' SUBCOOE COMPONENT'COOE.

SUBCOOE:

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w@ 9 10. '11 12 *13, 1B 19. 20* SEQUENTIAL OCCUR*RENCE"

• REPORT . REVISION.

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22-.. 23 .. 24, 26 27 28* 29:* JO 31. ACTION FUTURE. <, EFFECT SHUTOOWN

. . .. , . ATIACHMENT'*.*

NPRQ.4: PRIME COMP:.

'COMPONENT

• . TAKEN" ACTION ; ONPl:ANT

.:*:'._.METHOD-,.*:

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*FO.RM:>UB.

• ... SUPPLIER':

, MANUFACTURER':'

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IN* 11 19 11 *I@ 33.' 34 . ' 35 . J6.,, ' ' ' *.J'] ' . 40,.. 41 ' ' ' 42 43,. 44' ' ' 47 CAUSE'DESCRIPTION.ANO:CORRECTIVE:ACTIONS*@*

• * } 1 Io fr TI1e cause was. attributed to cable* length* and* routing*:;*

transducer placement and mounting,1

• . : 1 ! 1 1 land redundant transducer signal interference

.. *The cables .. were shortened-an& rerouted L : 1 I 2 I I transducer placement-.

optimized*

mounting mod-ified, and. transducer synchronize'd to the. i* :IJJJ. , . saine 'internal The:

was. *then satisfactorily-tes.ted.

The *same* improvementsl

Im I will be mad.e on Dresden' Unit: 3. ; 8 9'. I 80

% POWER ' .*

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DISCOVERY DESCRIPTION

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______ ____.L 8 9 -10* .

• 12:* 1'.l 44.. 45 AS 80 ACTIVITY CONTENT ' . C\ .

OF RELEASE.

.

• AMOUNT OF ACTIVITY LOCATION OF*

.

N/A . 44 ts. N/A PERSONNEl:.*EXP.OSURES:

. 'r.:;;:;\

. 80: ' NUMBER ' ; ' TYPE

II!l 1 o Io Io l@Ll.J@ __ . ____ N/_.A. ________

__,.,. ____________

__, 8 3. 11 12; 13 80 . PERSONNEL INJURIES. . : /;;;\*. 'NUMBER . :

.. : :IE. j' ol. ol ol@) :. . . . N/A. 8, 9 11 * ._i2-:*---.---------------------

........

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a'"'o.

• . LOSS OF-OR DAMAGE1TO*FAC1LITY:*f.G\*

• TYPE DESCRIPTlpN

• . . . *. ** ,.:....L..:.J.

LU@ I ' ' . N/ A *. ' ' 8: .'9 10 ' ' '.

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• I . NI A ,, a .. 9 10 I -]::r.*"}..';t.*

.* "-. ao* . NRC USE ONLY l *D 1

• I I: J *. I I I I Id I -I I I 68 69 ao.;;;

• * . .* DEVIATION*

REPORT * .* ' JJVR:.-No.*. . . * * :* * . STA':. UNIT.' YEAR?. NO:. It'-* !2 -2. -* 80--.: 8L . , PART. ll*Jl Tl£. OF-DEVtl ATl'ON::

• ...... OCCU.RREO . . *.12-2-80 2215* TIME. ' . . " DATE SYSTEM**AFFECTEO>

. 300, ..

• PLANT CONDITIONS,*

. . .. . ' Control Rod* Dr.ive: System*.*.

. MODE' Run* PWR'(MWT)

.

368 TESTING . . o* r,;-i** ...

YES'" NO:* DESCRIPTION OF EVENT.

• During**a:

reactor scram*,,

.. failed F-21. "SDV*Hi Hi".<-. ' ., DESCRIPTION OF CAUSE. Unknown *at this* *t iiiie* *.. --. OTHER APPL I

• I NFORMAT.I ON N/A. EQUIPMENT CiJ.Yes*

DR' FAILU.RE.

. Q:No., " N/A WR: NO; .. Dl0353 . PART 2. I OPERATING ENGi NEERS COMMENTS

• D*. McDowell 12-3-80.

• RESPONSIBLE SUPERVISOR*

DATE Complet.ed SDV air test,. instrument.

level. swit.ch test .and: ihdepend.ent UT verification.

Initiated ind'ependent*.

manual UT yeri*fication of SDV once' per< shift .on' Units* 2 and 3. . . SAFE.TY-TYPE'. OF DEVIATION EVENT OF* POTENT! AL. ** TE:CH: SP'EC' ,, NC°N._ REPORTABLE"

.. ANNUAL RELATED REPORTABLE OCCURRENCE::

• PUBL:lC:

I NTERE:sr:

.. ** . VIOLATION-OCCURRENCE REPORT I NG. . WR ISSUED "0: DAY .o*. 1 ?CFR2.F .. GI. 14 YES: YES D' 0.,. o. *** [!]* DAY: NOTI F:t*CATlON

. No .. o* NO D 6.6.B.2.b

..

• ACT! ON ITEM NO*. PROMPT* ON-.. S I TE NOTIFICATION

. "' -R. M.

12-9-80'

-* m, 80-A6 I 03L-O" Tl TL£ DATE TIME ' Tl TLE

• DATE TIME, **. 24-HOUR NRC NOTJ.F:l CAT:J ON . PROMPT OFF-SI TE NOTI FICATl'ON DT?H i NRC..;ENS Ehone* 12/2/80 2300 hrs. F. Palmer 12-10-80

• 9*:03 AM REG l*ON,

• I* I I DATE Tl.ME** Tl TLE. DATE'. TIME DTGM .. ., . REGION,!

I ! &. DOL* CATE TIME. Tl TLE: . DATE TI ME " . . RESPONSl.BLE COMP:ANY'.OFF:lCER

• INFORMED OF IOCFR2J CONDI Tl ONS AND THEIR REPORT TO* NRC * ... TITLE DATE TIME c I . . REVIEW* AN.D .COMPLETED'

-John W. Wuj ciga OPERATING.

ENGINEER D.ATF.: \ RESOlUT I ON APPROVED.

ANO' AUTHOR i FOR. 0 I' STR i SU Ti ON *

• aa-s,n*s:.

10*11** !FoRJ. I . J, ...... *,*'-' ... ** 12-8-80 DATE 12/s.}Pc DATE