ML19253C326

LER 79-104/03L-0:on 791028,remote Shutdown Indicator for Decay Heat Cooler Outlet Temp DH-40-TI Was Inoperable.Caused by Loose Precision Resistor Assembly.Resistor Bridge Assembly Tightened & DH-40-TI Returned to Svc

ML19253C326
Person / Time
Site:	Crystal River
Issue date:	11/20/1979
From:	Lancaster K FLORIDA POWER CORP.
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II)
Shared Package
ML19253C314	List: ML19253C313 ML19253C326
References
LER-79-104-03L, LER-79-104-3L, NUDOCS 7911300522
Download: ML19253C326 (1)

Text

, A' u.s.MucLEAA necutArcay coneusss CN Nac Ponasses

' LICENSEE EVENT REPORT EXHIBIT A ccNract succx: 1 I 1 l 1 l l tet.1 Ass pn:Nr on tves'ALL ascuinso INacnMAT!cM s s@

O 0 lgl 4 j 1l lg l l 1 lgl -g - ; g oei l F i Li C R) ?! 3 lgl 010I- l 0 [ wes=. Oi 0 e. i Gojii i

a a wes,.a r... a . -r a

, . . weau a coca i. u v.

CcN'T oei g 11@l 0i 5l0 l GQCugr

-;0 ;% 3i egga 0 12 'gl 1 0g2;8;7;9gl1[lJ210l719l@

64 6.

1 tw tMr gart 14 79 ag,CmTGATE 40

, 4 64 8 EVENT CEscAIPTICN ANO .nCS ASL1 ccNstcutNets h 1 At 0400 durine the nerfn-,ncn nf Daily Operatin? Surveillanca co-100_ fe u,,  !

o6 reported that the rethote shutdown indicator for "B" decay heat cooler outlet [

, , , temperature DH-40-TI was inoperable. This created an event contrary to Technica1l

,,, , Specification 3.3.3.5. No effect opon the plant or general.public. This is l

,g , the second occurrence reported for DH-40-TI. Reference LER 79-095. I

, I I o

oea i j

= =: .s=. _.,r=...- ,= ,=.

ai. I c t r 16 I El@ L.rJ@ ul1 i N i si Ti Riu i@ g@ i aZi @

, . . . i. .. i. i.

secusNTIA4. CCCOMEE%CI R$,CRT E EV3IlC~

t , ,o evi~r vua = uent ~a. coes -v so.

@ 4:gt I 719 I l- I i 1l 0l 4 l Id 10 l 3 l lL l d l0J CN W! e!."$'Kr 'TA[ b s h ^2 N E' b " [ T.1Si$ $v"T22 Ele.

IBIg u 2 y @ lZf@ u W@

24 l0 l010 l 0l v .a d@

v lNl@

2 l AI@

.2 l B l 0 l 4 I 5l(

causa cascnnerscN ANC conntenvt AcitcNs @

,,, gThe cause of this event is attributed to a loose precision resistor assenbiv. i

, , ,The resistor bridge assembly was tightened and DH-40-TI indication returned to i within toleEance. DH-40-TI was returned to service at 0900 on 2 November 1979. i m 1.

,,, g REI 79-10-11 has been initiated to evaluate decav heat remote shutdown indicationi ii. I I

'st ru'"s ,a:was c Wesstarus @ EsE#SN v =,se:vany :sscai v:o ies [E,,J@ I 1 l 0 l Ol@l N4 l lp !@l Operator observation  !

r = g,,,,,,, g.,,,, a u * * .a ua.. .- s.onos . ..uo, @

E Lzl @. ...uo,Lal@l - m,r. @ 1 I . . . I

. .'.*. Ua l 0 ; O l 0l@{Z j@l

- =,-- ,,e @ NA l

,Ab,'i.a -

,i. 10 Fl* 0l @l" NA l

• fess e.on obaba=r.

i* NA l

, . L.Z l lf*** @ Stsasta9c4 i.

Nac usa cNtv

o m.

W,7@,"y l .,,,, @ m 79113 00 SDA I 'l i i iii i erii 9ame of oreparer: et. F. Lancaster (904) 795-6486 (SEE Mu"3'm SUPPLZ3fENTArt I2ECElLCICN SM)

F44T J77

. a*

SUPPLEMENTARY INFORMATION Report No.: 50-302/79-104/03L-0 Facility: Crystal River Unit #3 Report Date: 20 November 1979 Occurrence Date: 28 October 1979 Identification of Occurrence:

Remote shutdown indicator for "B" decay heat cooler outlet temperature DH-40-TI inoperable, contrary to Technical Speci-fication 3.3.3.5.

Conditions Prior to Occurrence:

Mode 1 power operation (100%).

Description of Occurrence:

At 0400 during the performance of Daily Operating Surveillance SP-300 it was reported that the remote shutdown indicator for "B" acay heat cooler outlet temperature, DH-40-TI was inoperable.

It was discover 9d that DH-40-TI (103*F) was inconsistent with redundant Control Room indicator DH-2-TI-2 (95*F) and "B" decay heat pump suction indicator DH-6-TI-2 (80 F). Maittenance restored operability and DH-40-TI was returned to service at 0900 on 2 November 1979.

Designation of Apparent Cause:

The cause of this event is attributed to a loose precision resistor bridge assembly. The resistor bridge assembly was tightened and DH-40-TI was returned to service.

Analysis of Occurrence:

No effect upon the plant or general public.

Corrective Action:

REI 79-10-11 has been initiated to evaluate decay heat remote shutdown temperature indication. Further corrective action will be based upon the results of this evaluation and submitted as a supplement to this report.

Failure Data:

This is the second occurrence reported for DH-40-TI. Reference LER 79-095.

/rc 1444078