ML19338F032

LER 80-048/03L-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

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: ML19338F029 ML19338F032
References
LER-80-048-03L, NUDOCS 8010070416
Download: ML19338F032 (1)

Text

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

LICENSEE EVENT REPORT (PLEASE PRINT OR TYPE ALL REQUIRED INFORMATIONI CONTROL BLOCK: l i

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FI sl vl ll@l 01 cl l 010101 LICENSEE CODE 14 15 LICENSE NUMBER Olol Iofol@l 41111121Ol@l 25 26 LICENSE TYPE JO 57 CAT 58l@

l CON'T a a O i ,g,y l L j@l 0l 5 l 0 l 0 l 0 l 2 ] 6 l 7 @l 0 l 9 l 0 l 1 l 8 l 0 74l@l1 75 l 0 REPORT l0l1 l 8 l 080l@

DATE 7 8 60 61 DOCKET NUM8ER 68 69 EVENT DATE 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 1O I4 l l of twelve microphones had no response or unacceptably low response to a known noise l

[ 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. l l l 10181l 80 l 7 8 9 COY P.

SYST EM CAUSE CAUSE V A LV E CODE CODE SU8 CODE COMPONENT CODE SL9CCCE SUBCODE 10191 l Il B j@ W@ l z l@ l Il Nl Sl Tl R] Ujh W@ W @

12 13 18 19 20 7 8 9 to 11 SEQUENTIAL OCCURRENCE REPORr REVISION EVENT YE AR REPORT NO. CODE TYPE NO.

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43 44 47 CAUSE DESCRIPTION AND CORRECTIVE ACTIONS 27 The l i l O 1 i Microphone and/or transmitter gain had been reduced to prevent spurious trips. l 1 i 11 I l gain of the microphones and transmitters was returned to acceptable levels. Surveil-l

, 7 l lance test successfully completed. Reduction of gain will not be used to clear spur g iil3l l ious trips in the future. l l l

1 4 l 80 7 8 9 ST S  % POWER OTHERSTATUS DISCO RY DISCOVERY DESCRIPTION l

ITTsl W @ l 01 01 01@l N/A l l Bl@l Scheduled Surveillance Test l

ACTIVITY CONTENT LOCATION JF RELEASE l RELE ASED OF RELEASE AMOUNT OF ACTIVITY WW7 8 9

@ [_Zjgl to 11 N/A 44 l l N/A 45 80 l

PERSONNEL EXPOSURES NUM8ER TYPE DESCRIPTION l

1 7 l0l0l0l@' W @l"N/A PERSONNE'L iN;u' RIES g NuM8ER otSCRieTiON@

W l0l0l0l@l N/A 7 8 9 11 12 80 l , i l

TOSS OF OR DAMAGE TO FACILITY DESCRIPTION l

7 t 9 8 9 TYPE10 @l N/A 80 NRC USE ONLY

@ 8 010 079Y/la lllllllll1lIl 2 0 ISSUEl N/A @DE CRIPTION l 68 69 80 .

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NAur nr pqrPARrn PHONE:

(303) 785-2253 o