ML19253B857

LER 78-023/03L-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

ML19253B857
Person / Time
Site:	Three Mile Island
Issue date:	08/30/1978
From:	Mitchell D METROPOLITAN EDISON CO.
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION I)
Shared Package
ML19253B856	List: ML19253B855 ML19253B857
References
LER-78-023-03L-01, LER-78-23-3L-1, NUDOCS 7910310607
Download: ML19253B857 (1)

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LICENSEE EVENT REPORT C'CeiTROL SLOCK: l i

l l l , I lh (PLE ASE PRINT OR TYPE -6L REQUIRED INFORMATIONI O 1 lpl4lm lV lIl1 l6 l0 l_ l0 l0 l0 l0 l0 l_ l0 l0 l h l1 l1 h l1 l l l

? 8 9 LICENSEE CCCE 14 15 LICENSE N NSER 26 26 LICENSE TYPE JO 67 a r $4 CCN'T 0 5C7RCE l @l 0 l 5 t o l o lo 1218 lo Cl 69O 18 lo lc; j -l A74@ 018REPORT 75

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? 8 6G 61 COCK ET NUVSE R 68 EVENT DATE EVENT DESCRIPTION AND PROS A8LE CONSEQUENCES to o 2 lDuring a power reduction to 65% full 4.,cVer for turbine stop valve testing, the g 3  ; incere detector quadrant power tilt li=it cf 3.6h% was e: eeded rer a total of g ,  ; 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 O 6 l 017 l o s I 7 8 9 SYSTEM CAUSE CAUSE COVP. VALVE CODE COCE SUSCODE COMPONENT CODE SU8 CODE SUSC00E 7

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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.

O17 R[ PORT l 7 l$ l _l lQ l2 l} 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. COMPONENT TAKEN ACTION ONPLANT METHOD HOURS SUBMITTED FORM BUS. SUPPLIER MANUFACTURER X l@l34Cl@ 12 l@ l36Zi@ l0 01 01 3e I

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41 lZ p l9l9 33 3$ 4Q 42 43 44 4 CAUSE DESCRIPTION AND CCRRECTIVE ACTIONS i o lThe tilt transient was caused tv a ec=binatien of zenen buildup and centrol red i i l insertion associated with the planned rever reduction to 655 ^211 rever. Since i , pcuer was already belev thepcVer level cutoff, no i==ediate corrective action i 3 lvas required. Xenen burncut and r0d withdrawal associated with returnine pcver i 4  ; to 75% reduced tilt to the e.llevable li=its.

7 8 9 d FactLITY VETHCD OP STATUS  % POWER OTHER STATUS DISCOV E R Y DISCOVERY DESCRIPTION i s l F l@ l 0l 6l 5l@ NA l l A l@l Operator observation - alar:

7 8 9 10 12 13 44 45 46 9-ACTIVITY CONTENT AMOUNT OF ACTIVITY LOCATION OF RELEASE 1 6 RELEASE2l @D OF NA RELE ASE l l l NA 7 8 9 10 11 44 45 5 PERSCNNEL EXPOSURES NLVBER TYPE DESCRIPTION 7

i 178 9l0l0l0l@lZl@l NA 11 12 13 &:

PERSCNNE L INJURIES NUMBER DESCRiPTtON li 7

a 8 9 l0 0l0l@l 11 12 NA 8;

LOSS 08 OR D AMACE TO FACILITY TYPE DESCRIPTION 3 h

U 9

LU NA 7

1 9 8 9 l 3 lhl 10 3 ISSUED DE CRIPTION @ 7910310h7 ~Rc use c~v

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NAME OF PREPARER

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