ML20084R626

Telecopy Ro:On 750219,reactor Vessel Low Water Level Scram & low-low Isolation Switch LIS3-263-57B Tripped within Tech Spec Limits.Caused by Instrument Setpoint Drift.Switch Restored to Correct Setting

ML20084R626
Person / Time
Site:	Dresden
Issue date:	02/19/1975
From:	Stephenson B COMMONWEALTH EDISON CO.
To:	James Keppler NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION III)
Shared Package
ML20084R621	List: ML20084R619 ML20084R623 ML20084R626 ML20084R630
References
NUDOCS 8306150252
Download: ML20084R626 (2)

Text

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VEA235(1755)(2-037156E050)PD 02/19/75 1753 E

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ICS IPMBNGZ csp 8159424449 TDBN MORRIS IL 78 02Q 055dP 'EST PMS JAMES G KEPPLEH, HEG10NAL DIRECTOR, DIRECIORATE~ L1_ ggg$

r, REGULATORY-OPERATIONS-REGION J, U.S. ATOMIC COMMISSION, WU,(

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799 ROOSEVELT RD w/}O g/Dys/r 3

GLEN ELLYN IL 60137

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SUBJECT:

DPH-25, DHE80EN NUCLEAR POWER STATION UNIT J.

f HIS WILL CONFIRM A CONVERSATION WITH PHIL JOHNSON OF YO 1600 HOURS THIS DATE CONCEHNING REACTOR VESSEL LOW WATE L

AND LOW LOW ISOLATION SWITCH LISS-263-578 IO THIP WITHIN THE ES IECHNICAL SPECIFICATION LIMITS. THIS WAS aPPARENTLY THE H

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INSTRUMENT SEF POINT ORIFI AND INVESTIGATION IS IN PH0dHESS. THE SWITCH WAS IMMEDIATELY HESTORED TO COHRECT SETTING. OTH WERE SATISFACTORILY TESTED AT THIS TIME.

t.mi cas.ee) i L__

B B STEPHENSON SUPERINTENDENT DRESDEN NUCLEAR POWER STATION COMMONWEALTH EDISON COMPANY ROUTE 1 MOHRIS IL 60450 NNNN SF 1Ni (R$-69)

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