ML20084R498

Telecopy Ro:On 750317,during Control Rod Scram Testing, Determined Average Scram Insertion Times Not Meeting Tech Spec Average.Cause Not Stated.Addl Testing Continuing to Correct Problem

ML20084R498
Person / Time
Site:	Dresden
Issue date:	03/17/1975
From:	Stephenson B COMMONWEALTH EDISON CO.
To:	James Keppler NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION III)
Shared Package
ML20084R493	List: ML20084R488 ML20084R498
References
NUDOCS 8306150144
Download: ML20084R498 (1)

Text

v cy ce ,1 q l < =;---

ss' VEE 212( 1602) (2-03 6075E0 76) PD 05 /17/ 75 1602 ICS IPMBNGZ CSP 8159424449 TDBN MORRIS IL 115 03%{})0402P EST PMS JAMES G KEfELEB REG ION AL DIRECTOR DIRECTORATE OF REGULATORY OPERATIONS REGION 5 US NUCLEAR REGULATORY COMMISSION WUX 799 ROOSEVELT RD v L ,

GLEN ELL YN IL 60137 ,o 1

n

'l  ;

\

SUBJECT DPR-25, DRESDEN NUCLEAR POWER ST AT ION, UNIT 5. '

THIS WILL CONFIRM A CONVERSATION WITH MR. P JOHNSON OF YOUR OFFICE AT 1455 HOURS THIS DATE CONCERNING PERIODIC 25 CONTROL ROD SCRAM TESTING IN WHICH IT WAS DETERMINED THAT SECTION 3.3.C. ! 0F THE TECH SPECS COULD NOT BE MET FOR AVERAGE OF THE SCRAM INSERTION TIMES FOR THE 3 FASTEST RODS OF ALL GROUPS OF 4 CONTROL RODS IN A 2X2 ARRA Y.

THE RODS CAUSING THE PROBLEM ARE H-8 AND K-10 (FOR 5-0/0 AND 20-0/0 TRA VEL) , J-8(FOR 5-0/0, 20-0/0 AND 50-0/0 TRAVEL) A ND L-9, L-Il AND J-il (FOR 5-0/0 TRAVEL). A SECOND TEST OF THE AB0VE RODS DID NOT v m w +

DUPLICATE THE PREVIOUS RESULTS, IE, ALL DRIVES WERE SATISFACTORILY SCRAM TESTED WITHIN ALLOWABLE LIMITS. ADDITIONAL TESTING IS CONTINUING TO DETERMINE AND CORRECT THE PROBLEM OF SLOW INITIAL SCRAM TIMES.

B B STEPHENSON , SUPERINTENDENT, DRESDEN NUCLEAR POWER ST ATION, COMONWEALTH EDISON COMPANY RR I MORRIS IL 60450 NNNN

~;

, 5[ '

c<-

)

9306150144 750327 PDR 5

ADOCK 05000249 PDR s ,am,s