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Ro:On 750505,discovered That Control Circuit for Valve Steam Supply to RCIC Turbine Was Deenergized by Motor Control Unit Undervoltage Relay Coil Opening.Coil Replaced & Remote Operability of Valve Demonstrated
	ML20058K695
Person / Time
Site:	Monticello
Issue date:	05/05/1975
From:	Larson C; NORTHERN STATES POWER CO.
To:	James Keppler; NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION III)
References
	NUDOCS 9102130488
	Download: ML20058K695 (1)
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,{I NORTHERN-STATES POWER COMPANY L

Martticello Ibcl$ar Generating Plant bbaticello, Minnesota 55362 P

May" 5,1975 l

f Mr..J5 G;. Keppler; Director-Region III Office of Inspection and' Btforcen;cnt f

United States IMclear Regulatory Camission 799 Poosevelt Road i

Glen Ellyn,. Illinois 60137 Daar~Mr..Keppler:

}ENTImTin IUCLEAR GEhTRATING Pl.'XT Docket 16. 50-263 Licenso Ib, DIL22 T:

' On Ity S.1975.it was dic crered that the control' circuit for valvo 10-2073, L;

" teen Supply to RCIC Turbins, v: s d:-energi:cd.. Iracatq::ica 7 renici U---

t cthe noter control unit indervoltage relay coil had scn:L The coil ms t actL.

replaced cad r nto cper:.bilic/ 0; the volvo uns came.;rnted.

investigatione of' the occturence is continuing,-

Yours very y,

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C. E. Lar. d.

l Plant Mannger

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bbnticello thclear Generating Plc.nt CEL/kik cc: A Giarbusco G.Charnoff i

Minnesota Pollution Control Icency Attn:

E A Pryzina Filo s

i gO2130488750505 ADDCK 05000263 CF g

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ML20058K695