05000249/LER-1977-001, For Dresden Unit 3 Regarding During Normal Operation, Differential Pressure Indicating Switch 3-1349A Failed in the Opening Position

For Dresden Unit 3 Regarding During Normal Operation, Differential Pressure Indicating Switch 3-1349A Failed in the Opening Position

ML17252A283
Person / Time
Site:	Dresden
Issue date:	02/09/1977
From:	Stephenson B Commonwealth Edison Co
To:	James Keppler NRC/RGN-III
References
BBS Ltr. #77-110 LER 77-001-00
Download: ML17252A283 (3)

LER-1977-001, For Dresden Unit 3 Regarding During Normal Operation, Differential Pressure Indicating Switch 3-1349A Failed in the Opening Position

Event date:
Report date:
2491977001R00 - NRC Website

text

.,

Commonw. Edison Dresden Nucleai, ower Station R.R. #1.

Morris, Illinois 60450

.. Telephone 815/942-2920 BBS Ltr. #77-110 February 9, 1977 Mr. James G. Keppler, Regional Director Directorate of Regulatory Operations -

Regioh I I I tJ; S\\ Nuclear *Regulatory C0mmi*s-si*on 799 Rooseve.lt Road.

~VIL'J ICU [ <<'llilP Glen Ellyn, 11 i inois 60137 RlGUU\\lllR~ un\\J.i\\L O*LL \\JU Enclosed pleas*e" firid Reportable Occurrence report number 50-249/1977-1.

This ~epott i~ being_ submitted to your offic~ in accordance* with the Dresden Nuclear. Power Stat.ion Technical Specifications, Se~tion 6.6.B.,

.'d~/:,.

d74 'i: ?/~

. ~-:lf:,_:steph nson BBS: j o

. En.c.1 a.sure, cc:

Direttor of lnspect1on & Enforce~ent Station Superintendent Dresden Nuclear Power Station D.ire.ctor oJ Man.ag_em~nt Information & Program Control

.Pi 1 e/NRC 11:Jsfr**

. CONTROL BLOCK:I. I I I I I

(~LEASE PNlt'dT ALL REQUIRED li'<JFO!=iMATiD:':

LICENSEE l.:AME

@ElL'ILlol RI sj 3j

~;

8 9 14 J.

CATEGORY REPORT TYPE 1

6 e,, LICENSE NUM8cR

~ 1°1-101010101°1-1°101 LK:ENSE EVENT TYPE TYPE 1 4 1 1 1 1 1 11 1 1°131 15 25 26 30 31 32 REPORT SOURCE DOCKET NUMBER EVENT DATE REPORT OATE

• @E]coN*T**I I I w 7

8 57 58 59

~

60 I o I s I o *1 - I o 1+/-_~_9-_../

L_o *I 1 I l I l I T I 7 I 61 "6il",. 59-*-'.

74 to I 2*.1 o 1 9 I 71. 7 75sc:

EVENT DESCRIPTION

J9Tuli Dli{ihg_rf6tfual operatjcin, d\\Jf~_rential pressure 'indicati.~g switch 3-1349A._f_a_iJ_e_d _______ d

@fa) I in the open position.

The failure.causedan.isolatib.h condenser line break a:larm.

j 7

8 9 80

'[§I~ I to annunciate, and resu_lted i.n.~h'.~..L?.:QJ..ation of the* isolation con.denser.

The HP_C;I_.

7 ***e-9 00 [of5I I system was immed'iately verified to be operable.

This. is not. a repetit.!ve I

• 7**'*:-9,**9~.... **.--*"*.*:*

~-......... :..,..,~. ':

80 Ifil2l.l_gcc urr:en.ce.......,. (.5().,,.,2,4$/,-.1,.9,Z.Z:::-l.)? *...,..* ::*':/.. '* *

• 1' 8

• 9 mMe

~*

80 SYSTEM

CAUSE

.. coo*E,

.. COOE.

COMPONENT"CODE

@El l.f.1 E I W I 1 Ltd s I Tl RI ul.

7 8.-9.. 10'... *.

11

12.

. 17' Cl;>.l,ISE. DESCRIPTION COMiONENT

SUFPUER.

LIU 43:..

COMPONENT.

MANUFACTURER VIOLATlON l B I 0 rs. I 0 I

~

'44.

.47 48 ffi I The event was caused by the failure of an internal _microswitch.assembly in DP-IS J

- 7* *8 9.

~ I 3"'.'134.9A..

The. m.icroswit.ch failu-re (which was attributed. to dirty or oxid.ized 80

'l*i I:

80 7

8 9 fiJELI contacts) 7

.Ei 9 prevented 'DP:I s, 3-,l*J4.9A; fr::om.... adu-at i ng METHOD OF

% POWER

~ OTHER STATUS

• DISCOVERY e*lectrically. although the h

(Continue'd)

~o

• FACIUTY STATUS DISCOVERY DESCRIPTION EEl w I 0 I 9 I 6 I. '---' -N~A __

___.* I L~.l

'~~--NA_*~~~~~-~----

7

8.

9 10 12' 13 44.

45 46 so FORM. OF*

ACTIVITY CONT(NT RELEASED. OF*"RELEASE'

. AMOUNT'. OF* ACTIVIT'(

liliJ Lu u1 I...-_..,..:.N.:.:..:.A_*. ______ ___,,-

. 7 8'

g 10

,,. ' _44*

..

• LQCATION OF._ RELEASE 1*

NA 4'=5"""* ~-,-...,..-----------,,.;_..;._..,,.,., _

_;.:.,_~

__...,_ a__;d.,,

PERSONNEL EXPOSURES

• NUMBER TYPE OESCR.IPTION.

[ill] l 0 I 0 I 0 I. w

~-N

__ A_....,------------~-----_;_------.;;...._-_.;,__J

7'

8. 9.

• .. 11

'.12.

13.

' 80 *.

~ERS(JNN!=L *tNJE{RIES NUMBER *

DESCRIPTION

[illl.~J:oJ.,o Lo]..

.. '=-"L.'"""'~: *'"""'*""*.;...;;NA~* * """"***-..-.----_. __________ _..;::*

__.;,,;_~

..,,............._____..___,;,..;..-:.1J 7*

8~'

11 12 80

• ,**"... : 0Fi=s1r'E "CDNsE't:ii:JENt:ES~

lilll NA 7

8 9..

.~....

.80

.*LOSS OR*** DAMAGE*:'. TO FA.Cimv*.

TYPE OESc'fi1PTiON Efil w NA 7 *a* s 10 PUBLICITY [i-f?.] 'I*

NA. '

7:

8*9**

~- -

80.

ADDITIONAL FACTORS..

~

NA 7

8 9 80

~

7. 8.9 80 NAME-:-.-_ __...-* T._. *-**....

• L;;.a;;..;* n;:.;..*,;i.__...;.._ _______________ PHONE: __ E_x_t_._2_2_2 __ _

GPO 881 *.U.7

~ *:* ;

l

. J.

• "- tAl:JSE DESCRIPTION (Continu.ed) a.

• mechanical function of the switch was unimpaired.

The switch assembly on PP.IS 3-Jj49A was prompt}y replaced, and the i so 1 at ion condenser sys tern was

• /returned to service.

Nd further corrective action was indicated.

DPIS

. 3-1349A is a~arton model *288pressure sensor, with a range,of 0 -

100 inches H10 differential press~~e.

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