ML20150D319

/03L-0 on 780918:during Normal Oper,After Cooling Down the Torus,Rhr Heat Exchanger 1B Bypass RHR-MO-66B Failed to Oper,Due to Loose Set Screw on Yoke of Limiterque SMB-3 Operator

ML20150D319
Person / Time
Site:	Cooper
Issue date:	10/13/1978
From:	Barrus C NEBRASKA PUBLIC POWER DISTRICT
To:
Shared Package
ML20150D308	List: ML20150D305 ML20150D319
References
LER-78-032-03L, LER-78-32-3L, NUDOCS 7812050138
Download: ML20150D319 (1)

Text

NRC FORM 366 U. S. NUCLEAR REGUL ATORY COMMISSION

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LICENSEE EVENT REPORT CONTROL BLOCK: l i

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DATE 7 H f;I DOCK ET NUMBEH EVENT DESCRIPTION AND PROP AHl E CONSEQUENCES h 10121 lDuring normal operation, af ter coolinn down the torus. RHR-MO-66B (RHR Hent Exchnnent l 10 l 3 l llB Bypass) failed to open. It was further discovered that the valve stem voke was I in l4 l l loose, which caused the stem to mechanically bind. The valve failed partially _cDen- I lols) lThere were t- ) adverse effects on public health and safety. Redundant system was avail-l j o lo l lable. (R.T.S. 3.5.A.3(2) l l

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CAUSE DESCRIPTION AND CORRECTIVE ACTIONS lt 10lISet screw on yoke of a Limitoraue SMB-3 operator loosened and allowed stem to roenen. I 11 1 i I (Set sc rew was tightened, and a second set screw was niaced to lock thn firme.  % 1 l

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