ML20147C167

/03L-0 on 781115:during Test of Reactor Water Level,Level Switches L1S-263-57A&B Observed to Trip at Values Greater than Specified in Tech Specs.Caused by Minor Setpoint Drift

ML20147C167
Person / Time
Site:	Pilgrim
Issue date:	12/08/1978
From:	Mathis C BOSTON EDISON CO.
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION I)
Shared Package
ML20147C160	List: ML20147C155 ML20147C167
References
LER-78-054-03L, LER-78-54-3L, NUDOCS 7812180172
Download: ML20147C167 (1)

Text

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g j switches LIS.263-57A&ll were Observed 'to trip at values greater than those specified in  ;

3 ]3 ) ; Table 3.2.A of t.he T.S. These switches provide high water isolatfo. of the main steam yg lines when not 'in the run mode and reac tor pressure is greater than 880 pSIG. Re-y ; dundant switches with proper setpoints were operable, therefore, public health and l q safety were not affected. ,'

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i [ o ] [This event resulted from Tninor setpoint drif t. The switches were calibrated and tested ;

TTr1 I satisf actorily. The existing surveillance program is considered adequate to detect  ;

gl problems of this type, therefore, no further corrective action is contemplated. ,

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i Charles J. Mathis a 69 w' NAME Ot PHEPAlttH 617 746-7900 o pHoyt: ( o,