05000266/LER-1979-014-03, /03L-0:on 790912,charging Pump 1-P2B Found to Have Cylinder Block Crack.Caused by Pressure Spiking During Compression Stroke Following Hydrogen Separation During Suction Stroke.Cracked Block Replaced

/03L-0:on 790912,charging Pump 1-P2B Found to Have Cylinder Block Crack.Caused by Pressure Spiking During Compression Stroke Following Hydrogen Separation During Suction Stroke.Cracked Block Replaced

ML19209C419
Person / Time
Site:	Point Beach
Issue date:	09/26/1979
From:	Fay C WISCONSIN ELECTRIC POWER CO.
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION III)
Shared Package
ML19209C409	List: 05000266/LER-1979-014, Forwards LER 79-014/03L-0 05000266/LER-1979-014-03, /03L-0:on 790912,charging Pump 1-P2B Found to Have Cylinder Block Crack.Caused by Pressure Spiking During Compression Stroke Following Hydrogen Separation During Suction Stroke.Cracked Block Replaced
References
LER-79-014-03L, LER-79-14-3L, NUDOCS 7910150546
Download: ML19209C419 (1)

LER-1979-014, /03L-0:on 790912,charging Pump 1-P2B Found to Have Cylinder Block Crack.Caused by Pressure Spiking During Compression Stroke Following Hydrogen Separation During Suction Stroke.Cracked Block Replaced

Event date:
Report date:
2661979014R03 - NRC Website

text

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NRC FORM 366 U. S. NUCLEAR REdULATORY COMMISSION (7 77)

LICENSEE EVENT REPORT CONTROL BLOCK: l l

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4 60 61 DOCKET NUMBER 68 ti9 EVENT DATE 14

'S HEPORT DATE 80 EVENT DESCRIPTION AND PROBA8LE CONSEQUENCES h cyli W rl 10 2

10n 9-12-79 the 1-P2B charcinq oumo (1 of 3) was found to have a l block crack between the No. 2 cylinder and its suction port.

Althouah o

3 the limiting conditions were met, this constitutes an abnormal degra-O 4

o s I dation of a system designed to contain radioactive material o

e l(T.S. 15.6.9.2.B.4).

This event is similar to LER's 78-004/03L-0 and i

l78-007/03L-0.

Safety significance of this event was minimal.

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3J 34 35 34 31 40 41 42 43 44 47 CAUSE DESCRIPTION AND CORRECTIVE ACTIONS lThe charging pump is a variable caoacity Aiax Iron Works Tv~ T-125. TheI i

O t eracked block was replaced with a new spare.

Pressure spiking durina thel i

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compression stroke following hydrogen separation during the suction l

l stroke is suspected to have caused the cracking.

Installation of l

suction stabilizers is planned.

Discharge dampeners were installed 10 75 7

8 3 80 ST

% POWER OTHER STATUS dis O RY OtSCOVERY DESCRIPTION

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l A l@l Observation of minor leakace l

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DESCRIPTION

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