ML17252B191

LER 80-024/03L-0 for Dresden Unit 3 Regarding During Normal Operation with Reactor Level Instrument Surveillance in Progress, Level Switch LIS 3-263-58AB Tripped at Less than Tech. Spec. Limit of 84 Inches

ML17252B191
Person / Time
Site:	Dresden
Issue date:	06/13/1980
From:	Stephenson B Commonwealth Edison Co
To:	James Keppler NRC/RGN-III
References
BBS LTR. #80-507 LER 80-024/03L-0
Download: ML17252B191 (2)

Text

Commonwe.Edison Dresden Nuclear Power Station R.R. #1 Morris, Illinois 60450 Telephone 815/942-2920

• WN l 8 1980 June 13, 1980 BBS LTR. /180-507 James G. Keppler, Regional Director Directorate of Regulatory Operatfop.s - Region III U~S. Nuclear Regulatory Commission 799 Roosevelt Road Glen Ellyn, IL 60137 Reportable Occurrence Report iJ 8Q..:.24/03L..:.Q- ~Dock.e.t JI 050-249 , is being submitted to your office in acco:r;dance with Dresden Nuclear Power Station Technical Specification 6.6~B.2(a), reactor protection system or engineered safety feature instrument settings which are found to be less conservative::::

than those established by the Technical Specifications but which do not pre':'<;~-..t vent the fulfillment of the functional requirements of.affected systems.

~~\=)~Ji--

B.B. Stephenson .

Station Superintendent

.presden Nuclear Power Station BBS:

Enclosure cc: Director of Inspection & E.nfor.cement Director of Management Information & Program Control File/NRC

11.n1 LICENSEE EVENT REPORT

?._.  :*'C\J"TROL BLOCK: .___,._l_.....___.._ _.1_!_...._-'J 0 !PLEASE PRINT OR TYPE'L REQUIREO lNFORMATIONI ro-rna I I I L I D IR Is I 3 IG)I 0 I 0 I - I 0 I 0 I O: I 0 I 0 I0 I 0 1(2)1 4 11 11 11 11 I I© 1-. 101

~ 9 . LICENSEE. CODE,

• 14 . 15 LICENSE NUMBER 25 26 . LICENSE. TYPE JO. 57 CAT 5B CON~T

~rl J

;~~~; L.U©I 01 5 Io I o I o 1~2 I 41 9 IGI o* I~ 11 J 9_ 18 Io IG)I or 6 I 1 I o I 8 I o IG) 60 61 DOCKET NUMBER 08 69 EVENT DATE 74 75 . REPORT DATE 80 EVENT DESCRIPTION AND PROBABLE CONSEQUENCES (iQ\

I During normal operation,* with reactor'-ievel instrument surveillance in progress, level 0

1 3

I I switch LIS 3-263-58B tripped at less than the* Tech. Spec~ limit (Table 3.2.1) of 84 I0 14 1. I inches. The safety significance of this event was minimal since channel "A" and the

)a Is I I redundant Channel "B" instruments were operable. There was no effect on public health J

0 lo I I or safety. Previous occurrences.: R.O. 76-57/031-0,. Docket 50-237; 77....,51/031-0 and 80-23/031-0, Docket 50-249.

80.

SYSTEM CAUSE CAUSE COMP. VALVE CODE CODE SUBCODE COMPONENT CODE SUBCODE

• SUSCODE I I IB I@ ~@~@ 11IN1s1T IR 1u I@ L:J@} L:J@

9 10 11 12 13 18 19 20 SEQUENTIAL* OCCURRENCE REPORT REVISION G\ LEA/RO c~VENT YEAR REPORT NO. CODE TYPE NO.

"V REPORT NUMBER I 8 I. 0 I L=J I 0 I2 I4 I 1.......-1 10 13 ~ ~

21 22 23 24" 26. 27 28 29 30 31 32 ACTION . FUTURE EFFECT I o I o. I o ~

SHUTDOWN ATTACHMENT NPRD-4 PRIME COMP: COMPONENT TAKEN ACTION ON PLANT METHOD HOURS SUBMITTED FORM ::;us. SUPPLIER

• MANUFACTUR.E l!J@L~J@

33 34 .

L:J@

35 L!J 36 37 I 40I~@ 41 Ll@ ll:l y 0 1 .o 42 43 44 47 CAUSE DESCRIPTION AND.CORRECTIVE ACTIONS @

j 1 lo I I The cause of this event is.unknown at this time. The inst~ument was immediately re-tested, with satisfactory results. Subsequent tests were performed, and each time the

, I1 I I

~

results were satisfactory. DIS* 500-2 will continue to* be done monthly.

1 I2 I I

=IIIJ *---------------------------------------------------

~8 9 so FACILITY f:i(j\ METHOD OF STATUS  % POWER OTHFR STATUS ~ . DISCOVERY DISCOVERY DESCRIPTION @ ,

~ ~@ 1° 1 8 14 l@I~n---------44_. NtA

• I L!J@I Instrument Mechanic Surveillance

• a 9 10 12 45 ""-*.----'------------------~so 46 ACTIVITY CONTENT ~

~RELEASED OF RELEASC: ..>.MOUNT OF ACTIVITY ~ LOCATION*OF RELEASE @.

~ L2J@ ~I N/A ' . I N/A

8. 9 10 11 . 44 45 80 PERSONNEL EXPOSURES *(.;";;\

m 8 1° 9

NUMBER ~TYPE 12 DESCRIPTION ~

1° 1° 111021L:J1~3---------------------~-~-------------8--'0

?ERSONNEL INJURIES f,;:;\

N/A NUMBER DESCRIPTIONa

~ 10 10 jO l@I NA / ~

a 9 11 .~12:-------------------------~------------~---~

t4J\

zw* L:J@ .

LOSS OF OR DAMAGE TO FACILITY TYPE. DESCRIPTION I v::::J

. N A 8 9 10 80 PUBLICITY f:::'\ NRC USE ONLY ISSUEDf,;":;\ DESCRIPTION~* *Q

IITJ* LJLl6 8 9 10 N A 68 I I I I I I I I I I I I I "'~

69 30.;;

. P. Holland X-523