ML19269C172

LER 78-062/03L-0 on 780313:constant for Control Rod Changed from 12 to 20 Steps Because Nuisance Alarms Caused Rod Position Deviation Monitor to Be Inoperable.Caused by Failure to Check Negative Effects Before Changing Constant

ML19269C172
Person / Time
Site:	Beaver Valley
Issue date:	01/22/1979
From:	Werling J DUQUESNE LIGHT CO.
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION I)
Shared Package
ML19269C169	List: ML19269C167 ML19269C172 ML19269C173 ML19269C174
References
LER-78-062-03L, LER-78-62-3L, NUDOCS 7901290266
Download: ML19269C172 (1)

Text

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NRC PORM 366 .

U.S. NUCLEAR REGULATORY COMMISSION 71 LICENSEE EVENT REPORT CONTROL 8 LOCK: l l

l l l l lJh 6 (PLEASE PRINT OR TYPE ALL REQUIRED INFORMATIONI

@ l 8P9 l A lLICENSEE 7

B l VCODE l S l 1 l@[ is tS 0 l0 l- l 010 l0 l 0 l 0 l- l0 l 025 l@l4 UCENSE NuM8ER 26 l1 l1 l1 l1 l@l$7CATSd UCENSE TYPE JQ l l@

CON'T 7

o 8

so RC l L @l 0 l 5 l 0 l 0 l 0 l 3 l 3 l 4 @l 0 l 3 l 1 l 3, 7l 8 @l 0l 1l212l7l9l@

60 68 OOCx ET NuM8ER bd 69 EVENT CATE 14 75 REPORT OATE 80 EVENT DESCRIPTION ANO PROB A8LE CONSEQUENCES h FITI During a records review, it was discovered that, at 0912 hours0.0106 days <br />0.253 hours <br />0.00151 weeks <br />3.47016e-4 months <br /> on 3/13/78, the I

@ l computer constant for control rod position supervision was chanced from 12 to 20 l Lo l *_I l steps by the computer engineer because of nuisance alarms. This caused the rod 1 0 5 l po$ition deviation monitor to be inoperable. Since operations persop.71 were 1 0 6 l unaware of the change, the required 4 hour4.62963e-5 days <br />0.00111 hours <br />6.613757e-6 weeks <br />1.522e-6 months <br /> surveillance was not initiated. The l lTITl l normal 12 hour1.388889e-4 days <br />0.00333 hours <br />1.984127e-5 weeks <br />4.566e-6 months <br /> surveillance was performed and no abnormal conditions were observed. l ITTlil l The health and safety of the eeneral public were not ieopardized. I 7 s9 So

' E OE SU C E COMPONENT CODE SU8 CODE SU E

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81 12 13 18 19 i SEQUENTIAL OCCURRENCE REPORT REVISION LE R/Ro EVENT VEAR REPORT NO. CODE TYPE No.

4 Oi7 REPORT l7l8l 21 22 l-l 23 0 l6 l2 l 24 26

_l/l 27 l0 l 3 l lL l l_l l 0l 28 -~29 30 31 32 8C N C ON ONP T U HOURS S8 i FOR S. SUPPL E MANUF C RER lEl@lHl@

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3 dh 36 l 0l0 l 010 l 37 40 l46N l@ 43 Nl@ l43 Zl@ lZl919l9l@

44 4y CAUSE DESCRIPTION AND CORRECTIVE ACTIONS h i

o l The incident resulted from the failure of the computer engineer to ascertain if the I i

m constant chance wculd result in any additional surveillance requirements. The I

, 2 Lconstant was returned to 12 steps. other comouter constants were reviewed to i

, @ l insure no other constants were chanced without reOuired surveillance. l

@l s 9 7

I so ST T  % POWER OTH ER STATUS Ol$ RY OfSCOVERY DESCRIPTION 1 s J @ lll0l0[@l N/A l l C l@l Records review on 12/26/78 l ACTIVITY CC TENT '

REuAsEO 0, EuxsE toc,T:ON C, REu,$E @

. i s .uouNTO,N/A ACTivifv @I I 7 8 9 I z.]@ LzJ@l 10 tt 44 46 N/A I PER$0NNEL Expo $URES 80 NUM8ER TYPE DESCRIPTION i 7 l0l0l0l@ '

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Nuu.ER DEsCRiPTiCN@

7 i a 8 9 10l010l@l 11 12 N/A l Loss OF CR DAMAGE TO ,ACluTY 30 TY'E OESCRt*TICN 7

i 9 8 9 lZl@l to N/A l go 2 o g53yjg[,,N hlCESCRIPTION N/A i

7 8 9 to SS 69 llllllllllll l5 80 3 NAME OF PREPARER

• O US PHONE: 4l2~643'1200 E 770/a9o.V4