ML19209C429

LER 79-018/03L-0:on 790905,spray Valve Mo 2-1001-23B Found to Trip Breaker When Operated.Caused by Broken Bolt in Valve Motor Operator.All Four Bolts on Motor Operator Replaced

ML19209C429
Person / Time
Site:	Quad Cities
Issue date:	09/25/1979
From:	Swales J COMMONWEALTH EDISON CO.
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION III)
Shared Package
ML19209C413	List: ML19209C412 ML19209C429
References
LER-79-018-03L-02, LER-79-18-3L-2, NUDOCS 7910150557
Download: ML19209C429 (1)

Text

NR 6366 U. S. NUCLEAR REGULATORY COMMISSION (7 77)

LICENSEE EVENT REPORT (PLEASE PRINT OR TYPE ALL REQUIRED INFORMATION)

CONTROL BLOCK: l 1

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l9 l l L LICENSEE j Q l ACODE l D l 2 14 l@15 0 0 0 l - lLICENSE 0 l 0NUMBER l0l-l0l0l0 25 l@l 26 4 lLICENSE 1 l1 TYPE l1 llJGl@l$ 7 G lA T 68l@

CON'T O i y l L g[0 l5 to l0 l0 l2 l 6 ] 5 l@l680 l 699 l 0EVENT l 5DATE l 7 l 9 l@l0 9REPCRT 74 75 l2 l5DATE17 19dol@

7 8 60 61 DOCKET NUMBER EVENT OESCRIPTION AND PROB AELE CONSECUENCES h LO 2 l While performing the RHR Containment Coolino Valve Operabil i ty Test. procedure l r;575-] l QOS 1000-5, drywell spray valve M0 2-1001-23B was found to trip the breaker when l 10141 operated (TS 3 5.B.4). The M0 2-1001-23B valve is located on one of two redundant dry- l

[oTs-l l well cooling spray loops; subsequently, drywell spray capability was not jeopardized l o e las a result of this occurrence. In-line MO 2-1001-26B valve was o'perable, as were the l 0,7 l drywell spray valves in the A loop. All other active components of containmen t l 0 8 l cooling were operable. l 80 7 8 9 C E CO E SUSC E COMPON ENT CODE SUB OCE SU E FOTs1 l s l B lO LE_jh [B_j h l Vl A L l V l 0 l P lh (1,jh (jL,j h 20 7 8 9 10 11 12 13 18 19

,, SEQUENTIAL OCCURRENCE REPORT REVISION L EVENT VEAR R EPORT NO. CODE TYPE NO.

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CAUSE DESCRIPTION AND CORRECTIVE ACTIONS h i o l The cause of this occurrence was due to a broken bolt in the valve motor ooerator. l i , l The broken bolt caused the motor stator to be out of alignment, and rub acainst the _j rotor. Excessive motor current caused the breaker to trip . Corrective action was l l to replace all four bolts on the motor operator and successfully retest the valve for l

, , ; operability.

7 8 9 80 A  % POWER # OTHER STATUS OSO RY DISCOVERY DESCRIPTION NA Routine Test i s W@ l 0l 6 l 5 l@l l l B l@l l ACTIVtTY CO TENT RELEASED OF RELEASE AMOUNT OF ACTivlTY LOCATION OF RELEASE i 6 l Z l @ [Z_j@l NA l l NA l 7 8 9 10 13 44 45 80 PERSONNEL E.tPOSURES NUMBER TYPE DESCRIPTION

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LCSS OF OR DAMAGE TO FACIL TY 3 } 43 gcy a TYPE DESCRIPTION

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PUBuCiTv nRC usE cnty iSSU E Dm0ESCRIPTION .8, 2 n I N IU4d l NA l [lllllllll ll lI 7 8 3 to 68 69 80. E NAVE OF PREPARER J. Swales PHONE: M -"L-ML' 'v* t"

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