ML20084U795

Ro:On 700418,control Rod Drive D-3 Exceeded Max Insertion Time Following Scram During Startup Test Series.Control Rod Drive D-3 Scram Time Increasing & Will Be Monitored

ML20084U795
Person / Time
Site:	Dresden
Issue date:	05/14/1970
From:	Hoyt H COMMONWEALTH EDISON CO.
To:	Morris P US ATOMIC ENERGY COMMISSION (AEC)
Shared Package
ML20084U733	List: ML20084U785 ML20084U794 ML20084U795
References
01637, 1637, NUDOCS 8306290269
Download: ML20084U795 (1)

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( Q j' Commonwealth Edison Company 72 WEST ADAMS e T Pt E E T e CHICAGO. ILLONOes eoe90 Dresuen Huelcar Power Stacioa R. R. y1 Morris, Illiuois 00450 May g 1970 Dr. 1). e r A. liu t r ia , Dit ee;ot Diviciua ci neactor Liceaali.3 U. J. Atomic L.ergy Conaissica Washington, J.C. 20j43 SUGJSCT: hicende D1R-iv, Diesden Nucleac Poacr Sta tion Unit 2, Section 6.6.C.

of she Teenaieci Specifications.

1

Dear Dr. Norris:

l Tais ia to repurc a concitica relacing co the opera._ ion of the s ta tion la vaica the coattoi rod drive D-3 (14-11) exceeded che i .00 second u.axiuua inser-t ion t ime as required foc 907. insertion as required by section 3.3.C.2 of t he Technical Specification.

This attuatica usa d scovered on t.p c il li., 1W0_ following a scra:a o r CMM 2: 23 A.M. vaich waa par. of tue scattup tes aerica. The scrau tir.e to 'JG/. to- cc Mt .

ucrLiua of coa t ol rou ut ive D-3 a t this rx.e wou '/ .23 secoads, ior che ho;. oper '

a ua;; conuitioa. Driu a .2 is che drive unien has an original I nail sereun. Ail o;het 1/3 drivea nase the 10 uil t eplace.a;nt acteuu. Representative pressurized scram data for drive u-3 io date is as follous:

Drive Avs. Drive a J- i with 10 r.it screen 4 u-iU  !. iu 2.39 Ilot Fressuiized 4-lG-20 ,.23 2.77 Poue.

4-2/-/0 v.U7 2.77 Power S-6-70 9./0 3.04 l' owe r t

T'ac scram tihe for D-3 control rod drive is increasing abou. 7'

_as e::ps n ed_and will continue to be uoaitored. The drive is considered inoperable '

and shutdown uargin with Luis drive fully withdrawn will be met.

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