ML19210E329

LER 79-051/03L-0:on 791017,at 5% Power,Sys 21 Loop 1 Surge Tank Level Decreased to Low Level Setpoint,Tripping Loop 1 Bearing Water Pumps & Making Circulators Inoperable.Caused by Procedural Inadequacy & Operator Error

ML19210E329
Person / Time
Site:	Fort Saint Vrain
Issue date:	11/16/1979
From:	Gahm J PUBLIC SERVICE CO. OF COLORADO
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION IV)
Shared Package
ML19210E328	List: ML19210E327 ML19210E329
References
LER-79-051-03L, LER-79-51-3L, NUDOCS 7912040341
Download: ML19210E329 (1)

Text

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['o'TTl o l on october 17, 1979, while operating at 5% reactor power, System 21 Loop 1 surge tank o a l level decreased to the low level trip setpoint which tripped the Loop 1 bearing water l o 4 l pumps, making Loop 1 circulators inoperable per Fort St. Vrain Technical Specification l o s lLCo 4.2.1. This is reportable per Fort St. Vrain Technical Specification AC l o s l7.5.2(b)3 No accompanying occurrence. No effect on public health or safety. l 0 7 l ]

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35 40 43 44 47 CAUSE DESCRIPTION AND CORRECTIVE ACTIONS h 1 o l Procedure inadecuacy allowed intermittent operation of the bearing water makeuo I i i i sunolv and resulted in low surge tank level. The operator did not follow tha recom- I DTR ! mended ooerator action which allowed the loop shutdown to occur. Procedure ch_anged (1,L1J l to prevent this situation and operator reinserticted in croper respman M ,1 , r = - I i 4 l l 7 8 9 80 STA  % POWER OTHER STATUS IS O Y DISCOVERY DESCRIPTION 1 5 W@ l0 l o l 5 l@l N/A l l Al@l Loco 1 Circulator Shutdown l ACTivlTY CO TENT AMOUNT c/ ACTIVlfY LOCATION CF RELEASE i s RELEASE Zl @D OF RELEASE l"zl@l l l N/A N/a l PERSO~~R ExPOSSES NUMBER D ESCRIPTION i 7 l 0 l 0 l 0 lhlTYPEZlhlN/A

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