ML19341C516

LER 81-012/03L-0:on 810127,six of Twelve Steam Pipe Rupture (Pipe Cavity)Ultrasonic Noise Channels Had Unacceptably Low Response to Known Noise Source During Test.Caused by Microphone &/Or Transmitter Gain Reduced to Stop Tripping

ML19341C516
Person / Time
Site:	Fort Saint Vrain
Issue date:	02/26/1981
From:	Gahm J PUBLIC SERVICE CO. OF COLORADO
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION IV)
Shared Package
ML19341C513	List: ML19341C512 ML19341C516
References
LER-81-012-03L, LER-81-12-3L, NUDOCS 8103030677
Download: ML19341C516 (1)

Text

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EVENT DESCRIPTION AND PROSABLE CONSEQUENCES h lo 1:l l Durira test, six of twelve " Steam Pipe Rupture (Pipe Cavity)" ultrasonic noise chan- I g l nels were identified as being inoperable. Surveillance Test SR 5.4.1.2.lj-R revealed l g3,,, lthat the six channels had unacceptably low response to a known noise source. Degraded l l o i s i I mode of LCO 4.4.1, Table 4.4-2. Reportable per Fort St. Vrain Technical Specification l 10(6l l C 7. 5. 2(b)2. No affect on public health or safety. No accompanying occurrence. l l o 171 i Redundant systems available and operable. Similar event reported as R0 80-48. l 10181I I SONE

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4J de 47 CAUSE DESCRIPTION AND CC ARECTIVE ACTIONS lilol lMicrochene and/or transmitter esin had been reduced to orevent snurious tries. The i I i i i 1 i gain of the microchones and transnitters were returned to accentable leveis _ an d *1,

• I g ISurve111ance Test satisfactorily completed. Reduction of gain will not be used to oret-

i. l 31 l vent spurious trips in the future. Twice yearly calibration checks will be performed l i, i.i leo detect system drift. System evaluation has been requested from Nuclear Project  !

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