05000237/LER-1980-001, /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

/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)

LER-1980-001, /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

Event date:
Report date:
2371980001R00 - NRC Website

text

Commonwe9 Edison Dresden Nuclear Power Station R.R. #1 Morris, Illinois 60450 Telephone 815/942-2920 BBS Ltr. 1/80-61 January 30, 1~80 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.

BBS:nh Enclosure

$.R.~h B. B.. Stephenson

~3 {

Station Superintendent Dresden Nuclear Power Station cc:

Director of Inspection & Enforcement Director of Management Information & Program Control File/NRC 51980

J*v-- ~

771

..CENSEE EVENT REPORT e.

• *. *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 lo 1-lo lo lo lo I o I~ I o I o 1014I1 I 1 I 1 I 1 101 I 10 8

9

• LICENSEE CODE 14

15.

LICENSE NUMBER 25 26 LICENSE TYPE JO 57 CAT 58

t1TI

8.

~~~~~ L!

:J© I o I s I o I o Io 12 I 3 I 1 101 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@

60 61 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--------------------------------------------------.-----"'----------___,

OIJ 8 9 SYSTEM CODE IH IA I@

9 10 f'::;\\ LER/ROLVENT YEAR

~

REPORT I 8 I 0 I NUMBER 21 22

CAUSE

CAUSE CODE.

SUBCODE COMPONENT CODE

~@ ~@ IIINISITIRIUI@

11 12 13 18 SEQUENTIAL OCCURRENCE REPORT NO.

CODE I I I o Io I i I I /I I a '3 I n

M

~

27.

~

~

COMP.

VALVE SUB CODE SUB CODE

~ ~@

19 20 REPORT TYPE w

30 L=J 31 ACTION FUTURE EFFECT SHUTDOWN

• C:::..

• ATTACHMENT NPRD-4 PRIME COMP.

REVISION NO.

lilJ 32.

COMPONENT MANUFACTURER 80 TAKEN ACTION ON PLANT METHOD HOURS @. SUBMITTED FORM SUB.

SUPPLIER LLJ@Ll.J@)

Ll..I@ w I o Io Io I 6 I W@ lli.J@. lli.J@

33 34 35 36 37 40 41

• 42.

43 IG lo la lo I@

CAUSE DESCRIPTION AND CORRECTIVE ACTIONS @

44 47

!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.

.... B F!CILITY IJQ\\

METHOD OF

(.;::;\\

STATUS

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

TI.J L!J@ I 0 I 8 I 3 l@~l ___

N...;/_A_. ___....,1. W@I Turbine Control Valve Exercising 8

9 10 12 1'l 44

. *45 46 ACTIVITY CONTENT

~

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

~

W@~@I N/A 8

9.

10 11 44 80 80 45 LOCATION OF RELEASE @

N/A 80 PERSONNEL EXPOSURES r.::;::...

NUMBER

(.;':i\\ TYPE

DESCRIPTION

l2J I 0 I 0 I 0 '~@L...-_. -* __

N....,../A __________________ ___,

• 8 9

ll 12 13 BO PERSONNEL INJURIES c.\\

• NUMBER DESCRIPTION~

m, o 1 o 1 o i@L...-______

N_/A _______________ _... __ ___.

8 9

11 12 80 LOSS OF OR DAMAGE TO FACILITY '43°'

TYPE

DESCRIPTION

v::::J

~ L.:J@)L-. __________

N_f_A _____________________ ~

8 9

10 80 PUBLICITY Q\\

NRC USE ONLY ISSUEDC-\\ DESCRIPTION~

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

8 9

10 68 69 80*;

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