ML20084D683

Telecopy Message of Ro:On 701204,MSIVs Failed to Close. Caused by Thin Film on Pilot Valve.Valve Cleaned

ML20084D683
Person / Time
Site:	Dresden
Issue date:	12/04/1970
From:	Hoyt H COMMONWEALTH EDISON CO.
To:	Grier B US ATOMIC ENERGY COMMISSION (AEC)
Shared Package
ML20084D663	List: ML20084D660 ML20084D683
References
04723, 4723, NUDOCS 8304120198
Download: ML20084D683 (1)

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j DE CCA139 XRT0038 BP PBaJCN JollET .1CI. h E3flilk 4 80YCE N GRIER BIRECTOR Blv 0F CONPCI ANCE REGION 3 N3 ATONl'c ENERG1 CONIll3310N=

l 799 ROOSEVECT RD GCENECCYN ILC 60537 s

• THIS FICC CONFiluf CONVERSATION I4)J THIS DATE Fifil HH

- DONCE REGARDING FAICNRE OF N AIN STEAN Isol.ATION VALVES i .

l ON UNIT #2 TO CLOSE BURING BI' WEEKLY SERFICE AND TESTING l S iL11TINCEN 0500 A 0500 ON i5M$70. FA[ CURE TO CLOSE l

'(ACURRE,D IN THg NANUEL OPERATING N0DE ON INITI AL TESTING SD ZA 2B AND 2 C VALVES NOTEVER ALI. PARTI AC CLOSURE TEST OPERATIONS WERE NORMAC kA VACVE CCOSED. ON THE l SECO OPERATJON WHEREDtc t ASa 1D em 2B 2C DPERATED PROPERLY ONLY AFTER - -

j SEVERAC OPERATIONS 95 RING SYSTElf C00C DOWN AT 0500 TNIS DATE ORDERLY SNUT DOWN WAS INITI ATED AS DATE REQUIRED BY 3 7 D 3 AND SUB CRITICAL ATTAINED 0744 PILOT VALVE CONDITION APPE ARED CLEAN BUT CLOSE

INSPECTION REVE ALED A VERY THIN FILM VALVE OPERATION

~lNPROVES OTHERWISE UNTIL CLE AN DRY CLOTH. THOROUGH CLE ANING OF ALL PILOTS To BE ACCOMPCISHED F' OLLOWED DRY

RET.lulNG AND TESTING ON HE AD UP AND tlNIT, LOADING AIR SUPPLY. BEING CHECKED. HIGH TEMPERATURE 150 TO 200 F ON I

INBOARD PILOT NOTCH AT TIME OF NALFUNCTION APPE ARS UNRE ALTED AND CAUSE WILC BE INVESTIGATED TINING OF

iAA5D NSIV WERE 5 8 AND 5 7 SEC'ONDS Al'.THOUGH OTHER C

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! ,0PER ABCE VALTES NERE NOM AC=

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.ID0 NNell BONCE f5 0500 0500 I5 4170 iD A5B 5C EA iD 58 EC 0500 3 7 3 3 0744 I50 500 F iAi5D NSIV 5 8 5 7==

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x l f MEMO ROUTE SLIP See me about this. For concurrd[ For action.  ;

wry 15 A F.C=93 (Rev. Af my14. 1947) Note anr1 return. For slenaturti for leformation. t TO LName and unit) IMilALS REMARKS j-1 J. P. O'Reilly "

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4 TO (Name and wait) INtilALS REMARKS DATs TO (Name and unit) IMTIALS REMARKS  !

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DATE FEOM (Name and uhat) REMARKS H. D. Thornburg In accordance with PI 1000, item .08 a2u_altacheLis the.

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gM F #'7y original and three copies of a WX_reportgeportinglhe PKDNE NCL failure of MSIV's of Dresden Unit 2 to close, i D1TE2-8-70 h'- s USE OTHER $1DE FOR ADDITIONAL RLMARKS

• U. $ GOVERMuthf phi %ff%G OFFl(E a m7.-O-422007

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