ML19210D013

LER 79-101/03L-0:on 791017,safety Rod 8 Absolute Position Indication Would Not Respond to Rod Movement During Rod Control Exercises.Cause Unknown.Further Investigation Scheduled

ML19210D013
Person / Time
Site:	Crystal River
Issue date:	11/09/1979
From:	Lancaster K FLORIDA POWER CORP.
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II)
Shared Package
ML19210D007	List: ML19210D006 ML19210D013
References
LER-79-101-03L, LER-79-101-3L, NUDOCS 7911200415
Download: ML19210D013 (2)

Text

.

[

u.s.NuctsAn nacutArony e=e wssion

mac sons:sa ul f g

• a.m ' t.!CENSEE EVENT REFCRT EXHIBIT A l

l. ccarnot sLccc l 1 1  : 1 I l@ .

trLsAss paint ca rves ALL ascwaso issonarten I [mq l7 i Li c 3.) 713 Ig10101- t 0 i.ca.m of 0i~..OO  ! I to oigl4la 1,L gl i 1 rgli. - ag ;g

, ,, me ,,u. c:c. .. u .a a eca,.i n.. .4 i

CCh*T gaf l Lgl 0 Sic ;ccag7si.vgga i -to ; 3 0 r 2 gt 1: Ol 117I7l9Gl1Iil0191 719 l@

e oei 44*CATJATE dd ed en M to tv tMT 3aT1  ?. TS F 4 tv(NT CEscalmCN ANo ritCaAaka cchstcutNets that Group 1 safety rod 8 absolate positionj gg At 2300 in Mode 1 it was discover

(

. p , indication would not respond to rod movement during the performance of SP-333,

,,, , Control Rod Exercises. This created an event contrary to Technical Specificaciqn 3.1.3.3. No effect upon the plant or, general public. Rod 1-8 position was ,

, , , , verified by zone reference. This is the second occurrence reported for Rod

,,, ,1-8. Reference LER 79-79.  ;

2.* I j

w s.m . , = .

wn ,=. == - .,,==.. -

o,, i Ii ol@ (x_j@ l Z l@ l IlN l S 1 TI RI Ul@ (y@ J @

.2 2 .. ,  :=

. i. ..

, . cc :; magna cg igposef 84V10CM 33Cu sMTT A6 ggs sq ivspervtAm e tPCaf "eC. COC8 "'*1 %Q.

@ ,,augt y 17 19 1 i>  ::

1--.I

2 (1 801 11 I/l 10131

a ILI

. J

(-- ,!

si W22

• • Cu m s r1 548 #C# wt ** .m ASA kg f GTt= t a(. C

(,Z j @,.l XJ g Qas

[,,,Zj g u L Zj @ l 010 10 l

.l L..Yj@ gg l.,A ]@ lDil15iOlg .,

u ,

/

cAust cascaimcm Amo c:masenvs Ac tess

, , , g The cause of this event is unknown. Further investigation will be conducted ,

, , }duringsubsequentsurveillanceactivities. Corrective action will be based ,

,upon the results of that investigation. Rod 1-8 position is being verified ,

P.I. tube will be replaced during next plant outage.

, every eight (8) hours.  ;

f

... I "

so

'sSrI  % ,en u cricarrarus @ EsE8t v" E Operator observation

scevav :.semec* @  ;

it* (,Ej g l0 [9 l 8 l @ l NA l

[3!@l

.e .e ao 8

7 sg g is v3 *.

NA.. . .v @ j - 9....s,.. @

NA l j- FTTi'l L _j. T , .. .I u t l

. , . L._

i passesse6 sposuats t@l i, -

. isuneese tvet ess =imom

, l 01 010 l@ g @l NA l

! i 1

' ' ' .t..e,..',',m'its -

8 wwween stsceimosh ~

I j NA

! r ii, ea l 01 010 l@l is i:

s,.

• . =ss en on cava.as *c sacur*

a *t ssanw-tom l -NA l

l. Fi l ea oW@l

, to so i %8~.' C"' sac LSE cALY l

eo @g

.mte%l3tS48 *CM NA I .IIIfIiitiI i ei is e. sa

, ee es m/, s. ,.t, A,,,, _

K. F. Lancaster ,,,e ,, (904) 795_gg4

~

---

~ - (su Amm surr~rnr crzonAncu sm},0 p ,3 'D yJ'

s P SUPPLEMENTARY INFORMATION Report Number: 50-302/79-101/03L-0 Facility: Crystal River Unit #3 Report Date: 9 November 1979 Occurrence Date: 17 October 1979 Identification of Occurrence:

Inoperable absolute position indication for Rod 8 Group 1 contrary to Technical Specification 3.1.3.3.

Conditions Trior to Occurrence:

Mode.1 power operation (98%).

Description of Occurrence:

At 2300, in Mode 1, it was discovered that safety rod 1-8 absolute rod position indication would not respond to red movement during the. performance of SP-333, Control dod Exercises.

Rod 1-8 position was verified at 2340 at 100% withdrawn. Control rod position is'being verified at 100% withdrawn every eight (8) hours.

Designation of Apparent Cause:

The cause of this event is unknown.

Analysis of Occurrence:

No effect upon the plant or general public. Relative rod position indication for Rod 1-8 was operable.

Corrective Action:

Further investigation will be conducted during subsequent sur-veillance activities. Corrective action will be based upon the results of that investigation. P.I. tube will be replaced during next plant outage.

Failure Data:

This is the second occurrence of this type reported for Rod 1-8.

Reference LER 79-79.

/rc 1363 338