05000267/LER-1981-012-03, /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

/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: 05000267/LER-1981-012, Forwards LER 81-012/03L-0 05000267/LER-1981-012-03, /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
References
LER-81-012-03L, LER-81-12-3L, NUDOCS 8103030677
Download: ML19341C516 (1)

LER-1981-012, /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

Event date:
Report date:
2671981012R03 - NRC Website

text

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6 60 61 Dock ET NUve gn se EVENT DATE 74 75 RE*QRTCATE 80 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.

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