ML17252B372

Letter Confirming a Conversation Concerning Failure of 2-203-2D Main Steam Isolation Valve to Close Upon Receipt of Isolation Signal Following Scram on 01/22/1971

ML17252B372
Person / Time
Site:	Dresden
Issue date:	01/26/1971
From:	Hoyt H Commonwealth Edison Co
To:	Grier B US Atomic Energy Commission (AEC)
References
Download: ML17252B372 (2)

Text

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WILL CONFIRM CONVE.RSATIONl 1'630,*nns.. DATE WI.TH HUGH:: . t.. ";*.:'L i. . (. 'i. *; " DANCE REGARDING FAILURE Of 2--203-r2D MA'IN STEAM ISSOLATION:*\\<* t i VALVE TO CLOSE UPON RECE'ltPT OF *1'ssOLATION SfGNAL FOLLOWINCt *.<.;* - -:-Tl;... ' -~ e.. ; SCRAM AT 2120 ON 1~22-71 HlGH,;MOTS:TURE_ SEPERATOR w_~!~~-:: W:._,,*_':'j ~ 1LEVEL TRIP OF TURBAN STOPfVALVE CAUSED S~RAM DROP OF f.,j __ '*J._:,-_.y: ! :,Js1HM PRESSURE BELows50 IP s 1 f w1rHMollE sw1rc11 'IN RUNJJ,f , _': <'~*AIU s:_ D N~R~.~SAOt ACTLl6 :uR:R'l:F.. C2L r SDU~iL 04.* A~~C O~~~LE~~~~~~~N; ~,~,}'~';;; ... *. I OPERATION Of TEST AND OP~_~ATl ... ~~:_!Pl_LO~S BY_MANU~~ _S\\~ __ l!~H/,i~*\\:~}-1' [**. . OPERATlON REMEDIAL *AcT_L_qNl BE ING. )TAl<E_N: __ l_l~_~_LU_DES C_OMP_~ET_~_,_.:*.:.J,*:,j /CLEANING OF BOTH PILOT Vf\\LVES SEfRVERJNG EACH OF THE FOUR: J ::*'1 t ~ .. **1 i'. ;*;* OU TB OA~_p. l_S_SOL ATI o_~ VALV~S ___ ~f\\}__~ __ L; I ~-~_s_ EX TE_N D'I NG. ~-ROM.':. __ J' *;~.Jl.*;_.*1{ JRECENTLY INSTALLED FILTE~S TO Tf1°ESE VALVES AND lNCLUDING_*.. ~J<}_: f*. ..'.. '"*.- ---~--. -- -.. " ":*>l .. ~ A*1 R ACCUMULATORS CLEAN._t NP OPE RAr~:*oNs :lN_V~_~_'!_ED L 1 NE ~~-~--~I __ :;.~; J . AC CUM A~ A TOR~ Dl SSEM ?L_~. -~ ~-~-p _ ~~-~.Y.S ~_T __ _f_~~ S~_!_~_~OLL_~W~-~--- B_'( _ D.8. '(_j';j ~-,"~'. .* /~IF T:°i~ ~N V;Autri~ r: c~l~r~l-~~ ~:iiA M~ii N

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[ I COM PE TfTlON OF Tl MI NG AND! FU NCTlON AL TE ST COLD AND i. PARTIAL AND FULL CLOSURE tEST_S_ -ON ___,A_L_L ___ VALVES AT NO-~MAL.' I PRESSURE rw1 CE. PER WEEK DG-Fn~N-G-OPERA-r:1~o*N--~N-o*-*0THER_;._ -*- . l ~ . UNUSUAL COND'I Tl ONS OCCUREDI AS A RESQ OF THE SCRAM AND.; ... -. t--- / 1 SSOL AT I ON ACTl_.~N AP PROVEq BX. 'sT ~TI_ ON AND NU CLE AR i ~-- - i --.. ---- --~.- -.----._ - I RE_YIEW BOARDS= \\~ -. __ ***** *-* L... -~:.... t.... __

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