ML19289E777

LER 79-017/03L-0 on 790429:control Rod 26-27 Unresponsive to Insert Signal.Cause Undetermined.Corrective Actions:Relay Contacts & Relay Socket Contacts on Relay 3A-KL32 Spray Cleaned

ML19289E777
Person / Time
Site:	Pilgrim
Issue date:	05/22/1979
From:	Mathis C BOSTON EDISON CO.
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION I)
Shared Package
ML19289E772	List: ML19289E771 ML19289E777
References
LER-79-017-03L, LER-79-17-3L, NUDOCS 7905290100
Download: ML19289E777 (1)

Text

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CONTROL OLOCK: l l l l l l l

- i (PLEASC PRINT Olt TYPE ALL REQUtnED INf 00MATIOfD e

lo idlulAlrlpj.Sl1lgt.0 l0l0l0l0l0l0l0l0l0l0 lgl4l1l1l1l1lgl 7 8 D LICLNSLL COIJL 14 lb LICL ff,L Nuf.*LE f t T.a 26 l ;g LICLtd;,L 1 Yi L JU b7 Lesl L6 CON'T n

jojij i B Ory00l L l(gb1 o l 5 l 0 l- l0 l 2 l 9 l 3 lgl 0 l 4 l 2 [9 l 7 l 9 lg 0 l 5 l 2 l 2 l 7 l9 DOCK ET rdur.htE f t Gt UJ LVLtdi D/sil 74 75 f tLPOf t1 DAIL bu EVEfJT DESCHIPTIOfJ AND PROBAULE CONSEQUEfJCES h Io 2 l On Anril 29, 1979, while performing, control rod exercise surveillance 6.3.2. control  ;

o 3J [ rod 26-27 would not respond to an insert sir,nal. Technical Specific, tion 3.3.A.2a g o l4 l l requires that control rods must have the ability to be moved with control rod drive jo l3l l pressure. The CRD was declared inoperable and isolated for repairs. No ether drives I

o c l were inoperable therefore, shutdown capability was maintained and public health and I

po 7 [ safety were not affected.

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%YST E M CAUSF CAUSF 60 CODE COMP. VALVE CODE SUCCODE COMrONE NT CODE SUSCODE SUBCODE to 9 7 ,8 lR l Blh lX lh l Zlh lR lE lL lA lY l X l@

9 10 11 12 13 Ic 19

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_ SEQUEN11 AL OCCUn n t r.CE E VENT YE AR REFOftT REVISION RE PORT f40. CODE TYPE No.

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42 44 CAUSE DESCRIPTION AND CORRECTIVE ACTIONS h i

O l No apparent cause could be identified. The relay contacts and relay socket contacts  ;

i i l on relay 3A-K32 were spray cleaned and the CRD was exercised with no further

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i 4 I 1 8 9 I 80

$1A1 S  % POWE R OTHERSTATUS SCO Y i s y @ l1l0l0lgl N.A.

q- l B lg Routine Surveillance DISCOVERY D ~SCRIPTION l

ACTivlTY COP TENT nE tt ASED OF RELE ASE AMOUNT OF ACTIVITY LOCATION OF RE L EASE N.A. N.A.

t i l68 l9W @ l Zl@l 10 tt l l l 44 45 FERSONNEL E APOSURES EO NUMBER TYPE DESCRIPTION i

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l o j o [ 0 l@l z lgl N.A.

l FERSONNELINJU IES P.UYtt E F4 DESCulPTION O

i n 8 9 l0l0l0l@l 11 11 N.A.

l LOS OF OR DAMAGE lo FACILITY 80 iv r ( DE SCllirilON S i

l3l8 9W gl N.A. ,.%48 ;g. gm< 5s00490/06 10 l 00 l%Ul 2L"J LNjlgl ( SClllPTION N.A.

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6s 69 au Charles J. Mathis NAMC Or PitEPAHEH

• 617-746-7900 "