ML17252B555

LER 80-001/03L-0 for Dresden, Unit 2 Re While Performing Weekly Turbine Control Valve Exercising, the 1/2 Scram on RPS Channel a Received from the Closure of #3 Turbine Control Valve Would Not Reset

ML17252B555
Person / Time
Site:	Dresden
Issue date:	01/30/1980
From:	Stephenson B Commonwealth Edison Co
To:	James Keppler NRC/RGN-III
References
BBS LTR 80-61 LER 80-001/03L-0
Download: ML17252B555 (2)

Text

Commonwe9 Edison Dresden Nuclear Power Station R.R. #1 Morris, Illinois 60450 Telephone 815/942-2920 January 30, 1~80 BBS Ltr. 1/80-61 James G. Keppler'* Regional Director Directorate or Regulatory Operations - Region III U.S. Nuclear Regulatory Commission 729 Roosevelt Road Glen Ellyn, IL 60137 Reportable Occurence Report /f80-0l/03L-0, Docket 11050-237 is being submitted to your office in accordance with Dresden Nuclear Power Station Technical Specification.6.6.B.2.(b), conditions leading to operation in a degraded mode permitted by a limiting condition for operation or plant shutdown requi10ed by a limiting condition for operation.

$.R.~h B. B.. Stephenson * ~3{

Station Superintendent Dresden Nuclear Power Station BBS:nh Enclosure cc: Director of Inspection & Enforcement Director of Management Information & Program Control File/NRC 51980

e.

~

771

• . ..CENSEE EVENT REPORT

• *. *co"NT~ot BLOCK: I I IQ tPLEASE PRINT oR TYPE ALL REau1RED 1NFORMAT10N1

~ *~ . . 1 6 JI] Ir IL ID IR Is I 2 101 o 8 9

• LICENSEE CODE 14 15.

lo 1- lo lo lo lo I o I~ I oI o 1014I1 I 1 I 1 I 1 101 LICENSE NUMBER 25 26 LICENSE TYPE JO I

57 CAT 58 10

t1TI 8.

~~~~~

L!::J© I o I s 60 61 .

I o I o Io 12 I 3 I1 101 o I 1 L o I 6 I a I o I© I o I 1 I 3 I a I a I a I@

DOCKET NUMBER . 68 69 EVENT DATE 74 .75 *REPORT DATE

• 80 EVENT DESCRIPTION AND PROBABLE CONSEQUENCES@

~J,_.,_IJ I While Performing weekly turbine c'ontrol valve exercising. the 1/2 scram OD RPS Channel

JTI I A received from the closure of 113 turbine control valve would not reset. Unit load

~ I was reduced to< 45% power to bypass the generator load reject scram as permitted by . I

rIJ I T.S. Tabl~ 3.1.1. This event was of mini~i safety signific~nce since the other t))J 1control valves were operable. This is the first failure .of this type at Dresden.

Jll*L--------------------------------------------------.-----"'----------___,

OIJ8 9 80 SYSTEM CAUSE CAUSE COMP. VALVE CODE CODE . SUBCODE COMPONENT CODE SUB CODE SUB CODE IH IA I@ ~@ ~@ IIINISITIRIUI@ ~ ~@

9 10 11 12 13 18 19 20 SEQUENTIAL OCCURRENCE REPORT REVISION f'::;\ LER/ROLVENT YEAR REPORT NO. CODE TYPE NO.

~ REPORT NUMBER I

21 8 I0I 22 I

n I I o Io I i I M ~

I /I 27 .

I a '3 I

~ ~

w 30 L=J 31 lilJ 32 .

ACTION FUTURE EFFECT SHUTDOWN

• C:::.. *ATTACHMENT NPRD-4 PRIME COMP. COMPONENT TAKEN ACTION ON PLANT METHOD HOURS @ . SUBMITTED FORM SUB. SUPPLIER MANUFACTURER LLJ@Ll.J@)

33 34 Ll..I@

35 w

36 I o Io Io I 6 I W@

37 . 40 41 lli.J@. lli.J@

• 42 . 43 IG lo la lo I@

44 47 CAUSE DESCRIPTION AND CORRECTIVE ACTIONS @

!The micro switch which sends and resets the scram signal for the Vjckers fast acting

JTI I solenoid was found failed in the tripped position. Switch was out of adjustment, sub

ID I sequently causing switch to fail. Switch replaced, adjusted and valve operated proper- I

J)) .I lY. Replacement of. solenoids planned during refueling outage at which time all micro

rIJ I switches will be checked.

80

.... B F!CILITY IJQ\ METHOD OF (.;::;\

STATUS  % POWER OTHER STATUS \::::J DISCOVERY DISCOVERY DESCRIPTION ~

TI.J 8 L!J@ I 0 I 8 I 9 10 3 l@~l___N...;/_A_._ _ _....,1.

12 1'l 44 W@I Turbine

. *45 46 Control Valve Exercising 80 ACTIVITY CONTENT ~

>-r;"iRELEASED OF RELEASE AMOUNT OF ACTIVITY ~ LOCATION OF RELEASE @

~ W@~@I N/A N/A .

8 9. 10 11 44 45 80 PERSONNEL EXPOSURES r.::;::...

l2J NUMBER I0 I0 I0

(.;':i\ TYPE

'~@L...-_.-*__

DESCRIPTION N....,../A_ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ ____,

• 8 9 ll 12 13 BO PERSONNEL INJURIES c.\

m ,o 1o 1o i@L...-______N_/A_ _ _ _ _ _ _ _ _ _ _ _ _ _ __..._ ____.

8 9

• NUMBER 11

. DESCRIPTION~

12 80 LOSS OF OR DAMAGE TO FACILITY TYPE DESCRIPTION

'v::::J 43°'

~ L.:J@)L-.__________N_f_A_ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _~

8 9 10 80 PUBLICITY Q\ NRC USE ONLY ISSUEDC-\ DESCRIPTION~ . ., .

SJ 8

~~~-------------~N/~A~-------------------:!.

9 10 68 69 II II I I I I I I I I80*; I~

0