ML19269C951

LER 79-008/03L-0 on 790119:RC3-GP3-BL4 Light Did Not Extinguish When Test Switch Returned to Off Position.Caused by Dirty Contacts in Relay

ML19269C951
Person / Time
Site:	Crystal River
Issue date:	02/13/1979
From:	Cooper J FLORIDA POWER CORP.
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II)
Shared Package
ML19269C949	List: ML19269C947 ML19269C951
References
LER-79-008-03L, LER-79-8-3L, NUDOCS 7902220120
Download: ML19269C951 (2)

Text

~ ~

~~

1 U. S. NUCLEAR REGULATORY COMMISSION NRC FORM 364

• (7 771 EXHIBIT A LICENSEE EVENT REPORT I

(PLEASE PRINT OR TYPE ALL REQUIRED INFORMATIONI CONTROL SLOCE: l l l l l l )h .

i [TT'O I F ! LJ Q R) Pl 3 Jgl 0 } 0CENs4 l- l%01 MSLR 0l 0 l 0l 0 .S ; ;0 ; L4Casst 26 O g Tvet 4 ;401; 1l1 ; 1 g; c;ar 5 67 8 9 LICENa&E CCO&

I4 4 4 7 I

. CON'T o i

,[,% ( L_J@l 01 DOCaLET 51 0%lvgge -101 3}0 id l2 gl0; 69 EvtNT11 Garg 1l91 719 @ ;4 75 l0 f2i mE*CRT 3471 If3I807I ol @

J 8 6J 61 EVENT CESCRIPTION ANQ PACSABLE CONSEcVENCES h j

, 2 ;At 1346 while performing Engineered Safeguards Monthly Functional Test,

,(SP-130), it was discovered that RC3-GP3-BL4 light did not extinguish when g Investigation revealed ,

,the test switch was returned to the off position.

5C had failed. This created an event contrary to ;

, , ,thw. relay AR in cabinet Operability i o ,6  ; Technical Specification 3.3.2.1. Entered Action Statement 9.

No affect on public health and safety as redun ,

gg was restored in two hours. Eleven previous occurrences reported. Fourth I

tvoe.

,,4 , dant channels were operable. occurrence of this "

r . .

SLec CE s oba CC E $ SC E CCAwCN ENT :C DE CE o 9 i Si Hl@ [,Ej@ (JJ@ a l uRlE I L i AlY I.. Xl@ W@ W .. a @

, . ,o ,,

OCC'.;g e g geg ag,ogt

• E ustcN

. SE Q1;ENTI AL Ccct rves so mE*CmT No.

O s'Li* 80u';!;'

,(v f NT vtAm L-J l n in i 9 L_J v

I nl , I u .,

Wu L,

2

-J L0J n

_L2._L9 v .2 J u 2  :.

$P WAN 8 mim 5S FC* 5 ET d i. Oves g g gn g g'Eg lCJ 3l6(0lg i

AC CN QN FL %f 4 *e 10 l 0l Oi q ig n

8. g J g Q. @ 2 . v .o .. u - ,,

CAust oESCRir1 son ANo CoR AECnvE ACTIONS @

lThe cause of this event was attributed to dirty contacts in the AR relav.

I

, o d returned to ,

,The relay was sprayed with a cleaner, functionally tested, an

, operable status.

Engineering study (PD-718) associated with air filtration; recurrencep

, ,- [of engineering safeguards cabinets is being conducted to prevent 1

. 4 i F 5 9 0'5Cov gav OE10s*Y:QN 15

% 8'Mim OfwtaSTATV3

'5T l [B_,j@l Technician observation l y [E_j @ l 0} 6l 8 "l@l" NA 8 '

7 4C r.u rv C:\'rist toCariesos=stsass@ j

.et W L_haseo.J de settaseLZJ@l "

av ust: NA aCTiurv @ l l NA

...so.sdi

. . . a.,o.ss.,es

. =,,C...~,@ l IW 1010l0 l@{_Zj@l NA "

. .s:ssd'es .'in sv.s. essCai nes@ NA l

' l- 10 l 0l0 nl@l "

7

'. CF08Davagt O 8aCIL:f*

NA i a (Z_j@l n

, . , n n NA I IIIIIIII II IIl

a ,9d9,g@gg;aeving l a s. so

, ,. m s ave :s ,aE.4R E% - J. N e e-oNE .- 1904)795-6486 790222o u.0 (SE ATTACHED SUPPLEMENTA'lY INFORMATION SHEET)

SUPPLEMENTARY INFORMATION Report No.: 50-302/79-008/03L-0 Facility: Crystal River Unit #3 Report Date: 13 February 1979 Occurrence Date: 19 January 1979 Identification of Occurrence:

One inoperable engineered safety feature actuation system instrument channel contrary to Technical Specification 3.3.2.1.

Conditions Prior to Occurrence:

Mode 1 power operation (68%)

Description of Occurrence:

At 1346 while performing the Engineered Safeguardc Monthly Functional Test (SP-130), it was discovered that RC3-GP3-BL4 light would not extinguish when the test switch was returned to the off position. Upon investigation it was determined that relay AR had failed. Operability was restored in two hours.

Designation of Apparent Cause:

The cause of this event was found to be dirty contacts in the AR relay.

Analysis of Occurrence:

There was no hazard to the plant or general public as the affected channel was in a test mode with the two remaining channels operable.

Corrective Action:

The relay was sprayed with a contact cleaner, tested, and returned to operable status. Engineering study (PD-718) associated with air filtration of engineered safeguards cabinets is being conducted to prevent recurrence.

Failure Data:

Eleven previous occurrences reported. Fourth occurrence of this type.

/rc