ML20040B862

LER 81-054/03L-0:on 811221,insertion of Shallow Control Rods Resulted in Average Planar Linear Heat Generation Rate in Excess of Tech Spec Limits.Caused by Flux Coupling Between Control Rods.Extra Rods Inserted & Tech Specs Modified

ML20040B862
Person / Time
Site:	Nine Mile Point
Issue date:	01/18/1982
From:	Patrou N NIAGARA MOHAWK POWER CORP.
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION I)
Shared Package
ML20040B858	List: ML20040B857 ML20040B862
References
LER-81-054-03L, LER-81-54-3L, NUDOCS 8201260489
Download: ML20040B862 (1)

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B0 EVENT DESCRIPTION AND PROBABLE CONSEQUENCES h l0l2l l Duina s tcaiu state operation, the insettion of shalloto cont,1ct rods resulted in an l go;3l l average pCanutt lineat heat gene 1ation rate (APLilGR) of 8.72 lac /f t tehich exceeded the g

[o ;4; l ElmLt of 8.43 fae/f t ao pei Tech. Spec. Tabfc 3.1.7.d. This placed the pfcat in a EbnitL>lg goys; l condition as pet Tech. Spec. 3.1. 7.a. The safety concetits of this event teete mbrinal l l o ps y l because of its shott dittalion and magnLtude. LERs 78-32, 80-01 and 80-04 reported g l 0 l 7 l l simLCat ocettttences.  ;

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_v 2: n u 2, n n. av 2, n TAKEN A T ON ON PL A T M TH D HOURS 22 5 B MI ED FOR ts SUPPLIE M ANUF ACTURE R Lx_l@l J1 34 z i@ 18 30 l@ Ljl]@ 101015 I 3-I IN I@ INI@ Iz i g i zl 9 i9 l 9lg 3t, 40 41 42 43 44 47 CAUSE DESCRIPTION AND CORRECTIVE ACTIONS l , I o l l The cause of the event leas due to flux coupling betecen conttot rods. ImmediateCy l l, l , g l upon discoveting that the APLHGR linLt tats exceeded, sevetal control rods teete inserted l

,,i,i l tehich acted to Cotect the actuat APLflGR to 7.95 Ise/f t. A Tech. Spec. change has since g l,;,gl been implemented tehich nalsed the APLilGR limLt above the vabte inettsted by thLs event. l li14 1l l e i.

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