ML20056B897

AO 263/74-18:on 740614,during Hot Standby Operation Reactor Power Decreased Below 10% Power.On 740620,while Engineers Reviewing Shutdown Activities,Discovered Rod Worth Minimizer Operability Not Demonstrated on 740614

ML20056B897
Person / Time
Site:	Monticello
Issue date:	06/27/1974
From:	Mayer L NORTHERN STATES POWER CO.
To:	Oleary J US ATOMIC ENERGY COMMISSION (AEC)
References
AO-263-74-18, NUDOCS 9102140443
Download: ML20056B897 (2)

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UNITED STATES {

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ATOMIC ENERGY COMMISSION l

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DIVISION OF COMPLIANCE

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TELapwowe GLEN ELLYN, ILLINOls 60137 ela)s u-asso 7?

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March 20, 1972 t,:

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J. G. Keppler, Chief, Rqactor' Testing and Ope \\ rations Branch Division of Compliance, Headquarters

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NORTHERN STATES POWER COMPAhT 8

LICENSE NO. DPR-22 i

MONTICELLO RCIC ISOIATION SWITCH, IMPROPER TRIP POINT The attached inquiry report describing the failure of an RCIC isolation switch to trip at the prescribed set point durin'g surveillance testing

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is forwarded for information.

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i The action being taken by the licensee appears appropriate..

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I We intend to review the event during the next inspection.

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. Gaston Fiore111

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Senior Reactor Inspector 5 r '

Attachment:

CO Inquiry Rpt No. 050-263/72-03 (2 cys) cc:

E. G. Case, DRS (3)

R. S. Boyd, DRL (2) l~

R. C. DeYoung, DRL' (2) i D. J. Skovholt, DRL (3) i H. R. Denton, DRL (2)

L. Kornblith, CO R. H. Engelken, CO CO Files f

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