05000289/LER-1978-023-03, /03L-0:on 780805,during Power Reduction to 65% Full Power,Incore Detector Quadrant Power Tilt Limit Was Exceeded for 50 Minutes.Max Tilt 3.79%.Caused by Xenon Buildup & Control Rod Insertion.Tilt Returned within Limits

/03L-0:on 780805,during Power Reduction to 65% Full Power,Incore Detector Quadrant Power Tilt Limit Was Exceeded for 50 Minutes.Max Tilt 3.79%.Caused by Xenon Buildup & Control Rod Insertion.Tilt Returned within Limits

ML19253B857
Person / Time
Site:	Crane
Issue date:	08/30/1978
From:	Mitchell D METROPOLITAN EDISON CO.
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION I)
Shared Package
ML19253B856	List: 05000289/LER-1978-023, Forwards LER 78-023/03L-0.Event Did Not Require Reporting Per 780815 Discussion W/Nrc.Future Similar Events Will Not Be Reported 05000289/LER-1978-023-03, /03L-0:on 780805,during Power Reduction to 65% Full Power,Incore Detector Quadrant Power Tilt Limit Was Exceeded for 50 Minutes.Max Tilt 3.79%.Caused by Xenon Buildup & Control Rod Insertion.Tilt Returned within Limits
References
LER-78-023-03L-01, LER-78-23-3L-1, NUDOCS 7910310607
Download: ML19253B857 (1)

LER-1978-023, /03L-0:on 780805,during Power Reduction to 65% Full Power,Incore Detector Quadrant Power Tilt Limit Was Exceeded for 50 Minutes.Max Tilt 3.79%.Caused by Xenon Buildup & Control Rod Insertion.Tilt Returned within Limits

Event date:
Report date:
2891978023R03 - NRC Website

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8 6G 61 COCK ET NUVSE R 68 69 EVENT DATE 74 75 REPORT DATg 60 EVENT DESCRIPTION AND PROS A8LE CONSEQUENCES to lDuring a power reduction to 65% full 4.,cVer for turbine stop valve testing, the o

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incere detector quadrant power tilt li=it cf 3.6h% was e

eeded rer a total of g

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fifty minutes, which is a violation of T.S. 3.5.2.h.a and is repe

table in acccrdance g

with T.S. 6.9.2.3(2).

S e maxi =u= tilt experienced was +3 795. The tilt was g

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8 9 SYSTEM

CAUSE

CAUSE COVP.

VALVE CODE COCE SUSCODE COMPONENT CODE SU8 CODE SUSC00E 1 : 1 -l@ L x]@ Ix l@ I :l e l z z121z18 I:l@ lzl@

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9 to 11 12 13 18 19 20 SE QUE NTI AL cCOUR R E NCE REPORT REVISION LER RO EVENT YEAR REPORT NO.

COCE TYPE NO.

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i/l lQl}l l{ l l_l Ql 21 22 23 24 26 27 28 29 30 31 32 ACTION. FUTURE EF8ECT SHUTOOWN ATTACHMENT NPRO.4 PRIME COMP.

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CAUSE DESCRIPTION AND CCRRECTIVE ACTIONS i

o lThe tilt transient was caused tv a ec=binatien of zenen buildup and centrol red l insertion associated with the planned rever reduction to 655 ^211 rever.

Since i

i pcuer was already belev thepcVer level cutoff, no i==ediate corrective action i

lvas required. Xenen burncut and r0d withdrawal associated with returnine pcver i

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to 75% reduced tilt to the e.llevable li=its.

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FactLITY VETHCD OP STATUS

% POWER OTHER STATUS DISCOV E R Y DISCOVERY DESCRIPTION l F l@ l 0l 6l 5l@

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7 8 9 10 12 13 44 45 46 9-ACTIVITY CONTENT RELEASE @D OF RELE ASE l NA l

l NA AMOUNT OF ACTIVITY LOCATION OF RELEASE 2l 1

6 7

8 9 10 11 44 45 5

PERSCNNEL EXPOSURES NLVBER TYPE

DESCRIPTION

i 17 l0l0l0l@lZl@l NA 7

8 9 11 12 13 PERSCNNE L INJURIES NUMBER DESCRiPTtON l0 0l0l@l NA li a

7 8 9 11 12 8;

LOSS 08 OR D AMACE TO FACILITY h

9 TYPE

DESCRIPTION

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9 DE CRIPTION @

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~Rc use c~v ISSUED

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