ML20064D817

LER#78-071/03L-0 on 781003:train a River Water Pumps Found in Tripped Condition & Could Not Be Started from Control Room,Caused by Low Level Reed Switch Failure in Pond Level Switch LS511

ML20064D817
Person / Time
Site:	Farley
Issue date:	11/02/1978
From:	Hairston W ALABAMA POWER CO.
To:
Shared Package
ML20064D802	List: ML20064D798 ML20064D805 ML20064D809 ML20064D817 ML20064D824
References
LER-78-071-03L, LER-78-71-3L, NUDOCS 7811090196
Download: ML20064D817 (1)

Text

._. . _

NRC FORM 366 U. S. RUCLE AR REGUL A TORY COMMISSION 07H =

LICENSEE EVENT REPORT CONTROL BLOCK. l l l l l l lh (PLE ASE PRINT OR TYPE alt REQUIRED INFORMATIONI 1 6 10121 l A LICENSEE l LI JlCODE Ml Fl141l@l OI 0l -l 0lUCENSE 15 Ol Ol ol ol NuY6ER l nl nl@I 4 lLICENSE 26 26 Il 11TYPE il ll@l J3 l

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60 6 DOCKET NUVS ER 68 69 E% ENT DATE 74 75 REPORT DATE 80 EVENT DESCRIPTION AND PROB ABLE CONSEQUENCES h 10121l At 1930 on 10/3/73. the Train A river water (RW) nu m uovo nkcorvoA en ho in s l 1O l3) ] tripped condition, and could not be started from the" Control Room. The pumps were l 10141 l operable in local control. T/S 3.7.5 requires both RW loops operable._ The Train A ~l l0js) l RW pumps were returned to an operable status at 2230 on 10/3/78. T/S 3.7.5 action l 10 is l l statement requirements were met. The Train B RW pumps were operable. This occurrench l 0 l 7 l l had no ef fect on the health and safety of the public. Previous failure of DeLaval- l 1 O la l l Cems Series LS-800 level switch reported in LER 73-053/03L-0. 80 l

7 8 9 COYP.

SYSTEV CAUSE CAUSE VALVE CODE CODE SUSCODE COMPONENT CODE SUSCODE SUSCODE

[us] l WI Elh [E_j@ [A_jh l R l E l L l A lY lX lh Wh dj h 12 18 19 20 7 8 9 10 11 13 SEQUENTIAL OCCURRENCE REPORT REVISION EVENT YE AR REPORT No. CODE TYPE N O.

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_ 21 22 2J 24 26 27 28 29 30 31 TAE N ACT C ON PL NT T HOURS 22 5 e IT FOR 9 St PPLIE MAN FACTURER W @ l34X l h [35Z,_l@

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44 3J 36 33 40 42 CAUSE DESCRIPTION AND CORRECTIVE ACTIONS l

f Ii l 0 l l Pond Level Switch LS511 had both high and low level reed switches actuated due to low 1 i llevel reed switch failure-coincident with actual hinh pond level. A crack vn noterf I l

{ l in glass enclosure and contacts were fused shut. Failure possibiv due to noisture l gii7; l

l ' y ] entering switch. A replacement reed switch has been ordered. The Level Switch was ii la i Lremoved from the pump control circuitrv and main control hoard control of the punns I 1 a 9 s restored. The safety functio of ,1y -1gw pond level pump auto start is operable.e0

. S'ATUS  % POWER oTHER STATUS DISCOV E R Y DISCOVERY DESCRIPTION h

{ li Is l [CJ@ l 0 l 0] 0]@l Unit Heatup l l A l@l RW pumps in tripped condition l AC riviTY CONTENT REL E ASED of RELE ASE AMOUNT OF ACTIVITY LOCATION OF RELEASE x^ l I N^ l l

Ii Ie 8I 9LZJ @ ltoZ l@l 7 11 44 45 80 PERSONNEL ERPOSURES NUVG E R TYPE l i l 7 ] ] O ! 0 l 0 ]@[Zj@ DESCRIPTION l NA l a

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l li l I 810101 7 9 Ol@l NA 11 12 gn LOSS 05 CR D&VAGE TO FACILITY TYFE DE SC RIP TION lil91LZj@l N^

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7 8 9 10 NRC USE ONLY

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R 'tSUE l_E]@ lDESCRIPTION UA I ilIIIIIIIIIIl5 7 8 9 10 68 69 60 E W. C. Hairston. III PHONE C00 4 "

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