ML20148F778

/03L-0 on 781006:oxygen Analyzer Valves CV-5065-12,CV-5065-16 & CV-5065-25 Appeared Inoperable,But Local Observation Showed Valves Working Properly.Caused by Switch Misalignment.Ler Inconsistent W/Ler in Cover Ltr

ML20148F778
Person / Time
Site:	Pilgrim
Issue date:	11/02/1978
From:	Mathis C BOSTON EDISON CO.
To:
Shared Package
ML20148F764	List: ML20148F759 ML20148F778
References
LER-78-046-03L-01, LER-78-46-3L-1, NUDOCS 7811090168
Download: ML20148F778 (2)

Text

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05 DOCKI T NUMol H Ui b') LVE N T DATC 74 7b HLPOIIT DAll 00 EVf NT DEf"RIPTION AND PROBAul.L CONSEOULNCES l l 2 l l 0n 10-06-78, while investigating past problems with the oxygen analyzer valves, the l

,j3y l following valves appeared to be inoperable: CV-5065-12, 16 5 25 Valve CV-5065-12 had g, j j both open and closed indicating lights illuminated at all times: CV-5065-16andCV-5065-}5 had no indication in the closed position. Local observation verified that the valves

, g,l l were closing as required, therefore, the probable consequences of this event were minimal. A similar occurrence was reported in LER 78-024/03L-0 illl_J l  !

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i l O ] l The cause of this event was misalignment of the Lintit switch on CV-5065-12 and sticky l 3

]ill limit switches on CV-5065-16 & z5 CV-5065-12 was realigned, CV-5065-16 was cycled  ;

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' 5 BOSTON EDISON COMPANY I PILGRIM NUCLEAR POWER STATION DOCKET No. 50-293 Attachment to LER 78-045/03L-0 1

Event Description l On October 6,1978, while investigating past problems with the oxygen analyzer valves, the following valves appeared to be inoperable:

CV-5065-12, 16 6 25. Valve CV-5065-12 haa both open and closed indicating lights illuminated at all times; CV-5065-16 and CV-5065-25 had no indication in the closed position.

Cause and Corrective Action The limit switch arm for valve CV-5065-12 was found to be misaligned and not nmking contact with the striker. The arm was realigned and proper operation of limit switches and valve positioning verified.

The open indication (rec. for valve CV-5065-16 appeared to be functioning properly as the light did extinguish af ter a few seconds when given a closed s ignal . The close indication (green), which should have illuminated when the valve was in the intermediate position and when fully closed, did not function at all. No apparent alignment problems were evident and after cycling the valve a couple of times, the close indication started illuminat;ng.

The valve was cycled several times and each time, proper operation of position indication was verified. The limit switches for this valve have been scheduled for replacement.

The symptoms associated with valve CV-5065-25 were the same as for valve CV-5065-16, however, cycling of the valve did not correct the situation.

Local observation of the valve indicated proper operation so a Maintenance Request was issued and the limit switch was replaced in kind.

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