05000267/LER-1980-048-03, /03L-0:on 800901,during Surveillance Test,All Six Ultrasonic Noise Channels Were Found Inoperable.Microphone &/Or Transmitter Gain Had Been Reduced to Spurious Trips. Cause Not Stated.Gain Returned to Acceptable Levels

/03L-0:on 800901,during Surveillance Test,All Six Ultrasonic Noise Channels Were Found Inoperable.Microphone &/Or Transmitter Gain Had Been Reduced to Spurious Trips. Cause Not Stated.Gain Returned to Acceptable Levels

ML19338F032
Person / Time
Site:	Fort Saint Vrain
Issue date:	10/01/1980
From:	Gahm J PUBLIC SERVICE CO. OF COLORADO
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION IV)
Shared Package
ML19338F030	List: 05000267/LER-1980-048, Forwards LER 80-048/03L-0 05000267/LER-1980-048-03, /03L-0:on 800901,during Surveillance Test,All Six Ultrasonic Noise Channels Were Found Inoperable.Microphone &/Or Transmitter Gain Had Been Reduced to Spurious Trips. Cause Not Stated.Gain Returned to Acceptable Levels
References
LER-80-048-03L, NUDOCS 8010070416
Download: ML19338F032 (1)

LER-1980-048, /03L-0:on 800901,during Surveillance Test,All Six Ultrasonic Noise Channels Were Found Inoperable.Microphone &/Or Transmitter Gain Had Been Reduced to Spurious Trips. Cause Not Stated.Gain Returned to Acceptable Levels

Event date:
Report date:
2671980048R03 - NRC Website

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NRC FCM 366 U. S. NUCLE A% CEGULATORY COMMISSION (7 77)

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8 60 61 DOCKET NUM8ER 68 69 EVENT DATE 74 75 REPORT DATE 80 EVENT DESC10PTION AND PROBABLE CONSEQUENCES h lo l2l l During test, all six " Steam Pipe Rupture Under PCRV" ultra sonic noise _ channels were i 1013 l l identified as being inoperable. Surveillance Test SR 5.4.1.2.2j-R revealed that nine i l of twelve microphones had no response or unacceptably low response to a known noise l

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[ O i s I i source. Degraded mode of LCO 4.4.1, Table 4.4-2.

Reportable per Fort St. Vrain Tech-l l 0 l6 l I nical Specification AC 7.5.2(b)2.

No affect on public health or safety. No ac-l lol7l l companying occurrence. Redundant systems available and operable.

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