ML19269E601

LER 79-013/03L-0 on 790522:during Surveillance of Control Room Habitability Sys,Pressure Regulators for Control Room Pressurization Were Found Cycling.Caused by Improper Calibr. Controls Tuned & Procedure Revised

ML19269E601
Person / Time
Site:	Beaver Valley
Issue date:	06/21/1979
From:	Werling J DUQUESNE LIGHT CO.
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION I)
Shared Package
ML19269E593	List: ML19269E592 ML19269E595 ML19269E601
References
LER-79-013-03L, LER-79-13-3L, NUDOCS 7906290339
Download: ML19269E601 (1)

Text

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NR FORMd65 U. S. NUCLE AR REGULATORY COMMISSION tr.m 1.!CENSEE EVENT REPORT CONTROL BLOCK: l i

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7 8 60 61 COCKETNUMBER EVENT DESCRIPTION AND PROSABLE CONSECUENCES h During performance of a surveillance test on the control room habitability system, l

o 2 f5iT) l the pressure regulators for control room pressurization were observed cycling. The I o 4 Itest was suspended and an investication was commenced to determine the cause of the l Lo o 15_] I ma l f unc t ion . The cycline might have caused insufficient air capacity to pressurize 1 Presstiri: ation fan was nnerable for backup. I o ts Icontrol room for recuired hour.

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41 INl@ lzl@ l zl 919191@ 47 33 34 3a 37 40 42 43 44 CAUSE DESCRIPTION AND CORRECTIVE ACTIONS h i o l The pressure controllers had been calibrated with nominal cain and reset values l i i linstead of fine tuning the controllers which caused the valves to evele. The I l

i 2 l controls were tuned and the crocedure revised to incorocrate the exact cain and 3 3 l reset values. l I

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412-643-1158 NAME OF PREPARER