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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• 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

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nIJ. lsignifiCance* of this event~ was:m~nimal' since 'it did. n_ot affect* the scram' function. and

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0 j r jthe scram* d~t~charge' instrument* volume~ level switches . wete opetab*le<. Public health* and 4-. F' 0 ! s.r. 1'safety were Jlot: affected*~. :This *iS* the. first. occurrence of' this :type at Dresden~ L' o 1s1,~*---------*~i-*---------------------------------------------------------------'

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} 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

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IJJJ. ,. saine 'internal clock~ The: syste~ was. *then satisfactorily-tes.ted. The *same* improvementsl

Im I will be mad.e on Dresden' Unit: 3. I

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PERSONNEl:.*EXP.OSURES: . 'r.:;;:;\ .

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11

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• • . .* DEVIATION* REPORT * . *

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• * :* * . STA':. UNIT.' YEAR?. NO:.

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PART. ll*Jl Tl£. OF- DEVtl ATl'ON:: * ...... OCCU.RREO . .

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SYSTEM**AFFECTEO> .

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TESTING .

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Control Rod* Dr.ive: System*.*. . MODE' Run* PWR'(MWT) . l:OAC(M~)-_'

368 YES'" NO:*

DESCRIPTION OF EVENT.

• During**a: reactor scram*,, .. failed to-get.ala~. 902:-4~- F-21. "SDV*Hi Hi".<-

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DESCRIPTION OF CAUSE.

Unknown *at this* *t iiiie* *..

. OTHER APPL I C~BLE *I NFORMAT.I ON N/A.

EQUIPMENT CiJ.Yes* DR' NO.~ WR: NO; ..,-

12-3-80.

• D*. McDowell FAILU.RE. . Q:No., " N/A Dl0353 . *RESPONSIBLE SUPERVISOR* DATE PART 2. I OPERATING ENGi NEERS COMMENTS

• Complet.ed SDV air test,. instrument. volum~ 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 "0: .o*.

REPORTABLE OCCURRENCE::

• PUBL:lC: I NTERE:sr: ..* . .. VIOLATION-0.,.

OCCURRENCE REPORT I NG.

YES:

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14 DAY o.

1?CFR2.F

• * [!]* 3 ~. DAY: NOTI F:t*CATlON 6.6.B.2.b D' . No .. o* NO D

.. REPOR~t~~~k:CCCUR~ENcE* *ACT! ON ITEM NO*. PROMPT* ON-.. S I TE NOTIFICATION .

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- R. M. Ras~ui 12-9-80' -* ..

m, 80-A6 I 03L-O" Tl TL£ DATE TIME

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• DATE TIME,

• • . 24-HOUR NRC NOTJ.F:l CAT:J ON . PROMPT OFF-SI TE NOTI FICATl'ON i

DT?H NRC..;ENS Ehone* 12/2/80 2300 hrs. F. A~ 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

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RESPONSl.BLE COMP:ANY'.OFF:lCER *INFORMED OF CONDI Tl ONS AND THEIR REPORT TO* NRC

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... TITLE DATE TIME c I . .

REVIEW* AN.D .COMPLETED' - John W. Wuj ciga 12-8-80 OPERATING. ENGINEER DATE D.ATF.:

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RESOlUT I ON APPROVED. ANO' 12/s.}Pc AUTHOR i ZED~ FOR. 0 I' STR i SU Ti ON

• DATE

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