05000282/LER-1979-021-03, /03L-0 on 790611:steam Generator Level Channel 1LT471 Responded Slowly to Level Changes.Cause Unstated. Transmitter Diaphragm Assembly Replaced

/03L-0 on 790611:steam Generator Level Channel 1LT471 Responded Slowly to Level Changes.Cause Unstated. Transmitter Diaphragm Assembly Replaced

ML19261E224
Person / Time
Site:	Prairie Island
Issue date:	06/29/1979
From:	Hunstad A NORTHERN STATES POWER CO.
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION III)
Shared Package
ML19261E223	List: 05000282/LER-1979-021, Forwards LER 79-021/03L-0 05000282/LER-1979-021-03, /03L-0 on 790611:steam Generator Level Channel 1LT471 Responded Slowly to Level Changes.Cause Unstated. Transmitter Diaphragm Assembly Replaced
References
LER-79-021-03L, LER-79-21-3L, NUDOCS 7907050303
Download: ML19261E224 (1)

LER-1979-021, /03L-0 on 790611:steam Generator Level Channel 1LT471 Responded Slowly to Level Changes.Cause Unstated. Transmitter Diaphragm Assembly Replaced

Event date:
Report date:
2821979021R03 - NRC Website

text

(7 77)

LICENSEE EVENT REPORT CONTROL OLOCK. l l. l l

l l

(PLE ASE PRINT OR TYPE AtL REQUIRED INF ORM AiluN) lol1l M I N l P lI lN l@( 0 l 0 l-l 0 l 0 l 0 l 0 l 0l -l 0 l 0 l@l 4 l1 l1 l1l!l@l

}F 1

s.,

ouNsu m i.

is m u N -,4 oo N, m.<

CON'T

$,$ l L hl O l 5 l 0 l 0 0l2l8 2 @l0l6l1l1l7p @ [0,l6 2

9 l 7 l 9 li j o

1 EVENT DESC Tl0N A D PHOB A L

E ENCES l During routine startup operation, steam nenerator level channel itT471 was observed o

7 gto be slow in responding to level changes.

Peactor trip input from this cbannel__

J g

j would bwe been slower than the 1.5 seconds assumed in the FSAR.

Redundant channels !

g n

,, g were operable.

Not repetitive.

No effect on public health and safet>

Backon reacret trip capability was provided by the redundant two Icvel channels as described in the j

g FSAR.

g

, g Astute operator attention may be credited with detecting the s1cra response.

O h

7 4

')

s v S T E *.1 C C' E C 31 '.. t C f; '.* P

.A,5(

CUDE Ccot 6

.E

<fa*

N t '. T UU DE

, J 10 t

'. D F lI A l@ l E lh [X]h l IlN lS lT lR lU lh lT (O l Z l h o

~

1 8

4 10 11 1) 1?

1-I r NET'6NTIAt I'( ('l ib6' f

p[ F! H' gg p og

.fNTYEAH U(P(W T",0 (i

,f TvF[

@l2.ql7 a

14 19 I l-1 1 012 11 I l-l 12l3 I ILI L-J LL J,

N

- J a

APTION FUTljnf EFFECT W 4 T D' A TT A r s '.'E N '

W..

F h P *t

. D 'o

? ?'

TAKEN ALT +CN ONPLANT

'? [ T " / > D Whu SLEY!T T E D 10" 500 6'P L ' t 'i la lh[4_jh l Zl@

(.{Jh

() l0 l0 l0 l lNlh l Y !h l A lh l F ! 1[$, O '

Jj J

4 8

50 41 4j 44 43 CAUSE DESCRIPTION AND CORRE CTIVE ACTIONG l Transmitter diaphragm assembly v eplaced and transmitter tested satisfactorily.

i n

A g

lFoxboro D/P Transmitter Model E13Dll-SAMI.

Diaphrann assembly was returned to vendor l_for evaluation of the a

failure i

i lil4 11 i

4 2 F ACILIT Y h

'*il'"

3 C

S T A T V>

<PCGfH OTHfH NTAfs

\\C/

D47' ONIH" H f

.fHv

-'4

+

Pf/ ( I-klM b h l0l2l0l{l N/A l lAl]l Operator observation 4,

i, u

u m

AC TIV, T V CON T E N T n

I HEL( Asf D OFPELEASE

' T Of M 16 v!! v L'

iT'.

.( b!.t4'f (

I b

,, _, j

,o 4.

F f H'

'II F.M i. h f. 5 m

s I r,a Tyt.

(; r, s, r' ' N(N/

ap.

l0l0l0 M W @l NA i

i

- 2 o

o o

P[H SONN t t :

,ditS h( h( b}

(Jk

,h '

(0 l0 0l@l 4

'l O NA 1

s

- e o

u l f,J.S (;F O F4 O A Y A G [ T f) f A f ilIT*

TycE DE SL N P T

^'

I

^ 3 11 J"h8 7 9 0 7 05cm3

~

P I&J LNJ81 N^

I l l l MW

I-I 4

'l to S s/E of pnEP Ani. H P'

'L

~

~