ML19305B822

LER 80-004/03L-0:on 800219,while Performing Procedure Qms 700-1,automatic Blowdown Timer 287-105A Took 122-s to Time Out,Exceeding Tech Spec Limit.Caused by Instrument Setpoint Drift.Timer Adjusted & Verified to Be 100-s

ML19305B822
Person / Time
Site:	Quad Cities
Issue date:	03/06/1980
From:	Vahrenwald J COMMONWEALTH EDISON CO.
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION III)
Shared Package
ML19305B820	List: ML19305B819 ML19305B822
References
LER-80-004-03L-04, LER-80-4-3L-4, NUDOCS 8003200415
Download: ML19305B822 (1)

Text

ERC FORM 366 U.S. NUCLEAR REGULATORY CoMMISSloN UCENSEE EVENT REPORT

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[TITI l While performing the Automatic Blowdown Logic Test, nrocedure OMS 700-1. automatic l

- pTTT'l l blowdown timer 287-105A took 122 seconds to time out. This time was in excess of I g[ Technical Specification Table 3 2-2 allowable limit of eaual to or less than 120 ,

Lo i s] l seconds. The redundant 287-105B timer actuated in 112 seconds. Thus. the functional 1 o e l requirements of the Automatic Pressure Relief system aid have performed within the l gl design time f rame if initiated. 1 ITili'l I I E CODE SUSC E COMPONENT CODE SUSCODE S E 7

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47 CAUSE DESCRIPTION AND CORRECTIVE ACTIONS h g ] The cause of this occurrence was instrument set point drift. The 287-105A timer l i i l was adjusted and tested under work reauest number Q 03655 on February 25. 1980. The I

, ., l corrected time for the 287-105A timer was verified to be 100 seconds. l L' l.3_1 I I EE)8 I9 7 80 i

STA  % POWER OTHER STATUS IS O RY DISCOVERY DESCRIPTION NA lB[gl Logic Test

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7 8 9 to 68 69 80.S NAME OF PREPARER J. Vahrenwald 8003 200 HSPHONE: 309-654-2241 ext. 195 o i