05000265/LER-1979-018-03, /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

/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: 05000265/LER-1979-018, Forwards LER 79-018/03L-0 05000265/LER-1979-018-03, /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
References
LER-79-018-03L-02, LER-79-18-3L-2, NUDOCS 7910150557
Download: ML19209C429 (1)

LER-1979-018, /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

Event date:
Report date:
2651979018R03 - NRC Website

text

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

LICENSEE EVENT REPORT CONTROL BLOCK: l l

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60 61 DOCKET NUMBER 68 69 EVENT DATE 74 75 REPCRT DATE do 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

l cooling were operable.

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10 11 12 13 18 19 20 SEQUENTIAL OCCURRENCE REPORT REVISION EVENT VEAR R EPORT NO.

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33 35 31 40 41 42 43 44 47 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.

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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

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1. OTHER STATUS OSO RY DISCOVERY DESCRIPTION NA l

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