ML19312A132

LER 78-012/03L-1 on 781229:during Routine Maint of Charging Pump CH-1B,crack in Valve Block at Piston 3 Was Found.Caused by Excessive Vibration During Operation

ML19312A132
Person / Time
Site:	Fort Calhoun
Issue date:	01/19/1979
From:	David Jones, Stevens J OMAHA PUBLIC POWER DISTRICT
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION IV)
Shared Package
ML19312A130	List: ML19312A129 ML19312A132
References
LER-78-012-03L, LER-78-12-3L, NUDOCS 7902050154
Download: ML19312A132 (1)

Text

NRC FORM ll56 U. S. NUCLEAR RJ JLATORY COMMISSION g.m UPDATE REPORT-PREVIOUS REPORT DATE May 11, 1978 LICENSEE EVENT REPORT CONTROL BLOCK: l l l l l l l (PLEASE PRINT OR TYPE ALL REQUIRED INFORMATION) i e ol1I' !T I LICENSEE E I F ICODE C l S l 1 l@l 0 10 l 0 10 l0 l 0 l 0 lo l0 lo l025l@ldh l 1L1;ENSE 11TYPE 1l 10 @57 CAT l l

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CON'T UI' 7 3 50 RC l60L @l 0 l 5 l DOCXET 61 0 l 0 NUMBER 10 12 18 15 68 l@l1 63 12 12 l0 l7 l8 @l Ol?EPORT EVENT DATE '4 73 ll 1191 O ATE Tl 91@ 50

, EVENT DESCRIPTION AND PROBABLE CONSEQUENCES oi2 lDuring routine maintenance of chareine pumn CH-1B a crack in the valve block at numberi o 3 13 piston was discovered. The leakage is within limits for cont i nual operation but vill o 4 lbe closely r.onitored until a replacement block is available. Pump ocerability veri- 1 oi5 jfied by periodic ISI testing; no degradation in pump performance with respect to j o is l capacity and discharge pressure has been indicated. I ol7 l I ota i I 7 8 9 30 SYSTEM CAUSE CAUSE COMP. VA LV E CCOE CODE SUSCODE COMPCNENT CCOE SUSCODE SUSCOCE 019 l P l C l@ {@ l Bl@ l P l U l M l P l X l X l@ l E l@ l 20Zl @

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l.Io iThe cause is excessive vibration exterienced by this system durine aneration. A desienf ii l change is approved and avaitine parts for installation within to days. Modificei- I

,,7; lto reduce vibration in the C7CS system are in proeress. 'T'he tenn was orerational with I i

- lthe cracked block, however, it recuired frecuent oil chances. I ii 4 l l 3 3 20 ST  % PCwER OTHER STATUS I Y OlSCOVERY CESCRIPTICN t

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