05000334/LER-1981-015-03, /03L-0:on 810204,RCS Loop 1 Low Flow Annunciator Alarmed Intermittently.Flow Channel 414 Declared Inoperable & Bistable Tripped.Caused by Leaking Diaphragm.Diaphragm Replaced

/03L-0:on 810204,RCS Loop 1 Low Flow Annunciator Alarmed Intermittently.Flow Channel 414 Declared Inoperable & Bistable Tripped.Caused by Leaking Diaphragm.Diaphragm Replaced

ML20008E944
Person / Time
Site:	Beaver Valley
Issue date:	03/02/1981
From:	Lacey W DUQUESNE LIGHT CO.
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION I)
Shared Package
ML20008E943	List: 05000334/LER-1981-015, Forwards LER 81-015/03L-0 05000334/LER-1981-015-03, /03L-0:on 810204,RCS Loop 1 Low Flow Annunciator Alarmed Intermittently.Flow Channel 414 Declared Inoperable & Bistable Tripped.Caused by Leaking Diaphragm.Diaphragm Replaced
References
LER-81-015-03L, LER-81-15-3L, NUDOCS 8103100586
Download: ML20008E944 (2)

LER-1981-015, /03L-0:on 810204,RCS Loop 1 Low Flow Annunciator Alarmed Intermittently.Flow Channel 414 Declared Inoperable & Bistable Tripped.Caused by Leaking Diaphragm.Diaphragm Replaced

Event date:
Report date:
3341981015R03 - NRC Website

text

- __

UCENSEE EVENT REPORT

.IQ irtE4sE ramr on Tyre att aEcuicEo moon =4Tiom ContactStoCml I

l l

1 1

i lP l A l B lV l S l 1 l@l 0 l0 l-l 0 l0 l0 l010 l-l0 l0 l@l4 l1 l1 11 l1 @[s, ca r 3. @

Jl o :

s e e uCENseaCcot is is uCEaos wes t,=

a uCaut tv,e,,i La t.t.J O'Cf i t Gl o l 5101010 l 31314 Glo I2 to 141811 Glo 11101218111@

CON'T s

0 44 Gl OoCatf w ustm ed 49 avtNTQAfg la

t agroatoArg gJ EVENT DESCalPTION AND PRC8ASLE CONSEQUENCES h g lOn 2/4/81, the Reactor Coolant System Loop 1 low flow annunciator began. to alarm l

g l interciittently. At 0845 hours0.00978 days <br />0.235 hours <br />0.0014 weeks <br />3.215225e-4 months <br />, Flow Channel 414 was declared inoperabic.ind its j

["iT} l associated bistable was tripped at 0902 hours0.0104 days <br />0.251 hours <br />0.00149 weeks <br />3.43211e-4 months <br />. Power operation continued in l

[TTT1 p accordance with Technical Specification 3.3.1.1.

The public health and safety was [TT7] l not icopardized since the channel malfunction resulted in placing the reactor l

I ITT71 Inrotection system in a more conservative condition.

I lala i l

$J SYSTEA4 CAust CAU$t CowP.

vatvt COCE CCoE SUSCODE CouroNENT CODE SUSC00t SU8COCE l Il Al@ @@ W@ l1l Nl Sl Tl RI U[@ l Tl@ l Zl@

o 9 7

8 9

to es 32 v2 id is

J SLOB 4 NTt AL OCCURRENCE mtPCRT atV,$10N gereo tytNTytAR atPORT NO.

CODE TYPt No.

O",a(g i al il 1-1 10111si

.[ d 10131 LtJ I-I 10J

, :n n

24

s 2r

n

s u

at 22

^SeMe"EtU ac'a*"SOe. "s'v"eNi7 uE~#"IfCTv"a't a l 0 l O ! 0 @l O f l Yj@

l Nlg lN l@

lFl1l210lg EtY *ErYe'd oEIt2Nr

'"#EWo" v

wouns s

(f.}.,,.j@l Z l@

W@

lZl@

u u

n u

v sa u

sa

<s a

<r cAUSE DESCR:PTION AND CCRHECTIVE ACTIONS g { As an ic=ediate action, the channel was placed in service with a setpoint of 85 l

This1 gg l percent of the actual loop flow to eliminate the intermittent alarm condition.

satisfied the Technical Specification requirements for design flow. Further]

g gsetpoint The diaphragm was l

), 3, g [ investigation of the transmitter revealed a leakin;*. diaphragm.

I A Ireplaced and the channel was returnrd to service.

s>

?

4 9 h

%*CwtR CTwf R STATVS s'

av DISCOVERY CiscostioN R ltl@ lol8l6l@l N/A I

lAl@lControlroomannunciator l

$T A$nviTv CelttNT LCCAftCN CF mitt ASE mtLEAsto ^8 atLE A$t avCUNT OF aCTivatv l

N/A I

I N/A I

Ia l til @i L.ij@as It

' tascs di f..es m e,. m @

-.E I

unj i o ! o I o !@l : !@l N/A

,t.:assa'isJts

tsCm* fio**h I

w vata A lol010181 N/A 3J 3

s D

't 12 L Zs 08 OA O AuAct TO pac 1LaTV tvet

t s; me r fic*e l

1 l@l N/A i a

.a r

s >

e LEfdl N/A I

If!!Ill!'t !!li

%g g5Caipf tC, s

68 43 30.-

?

4 a

-)

• 12~

?'~6S 5 I"U d ?

PW*@

is A*.4 OF PP17 AsiER 81-0 8100fM'

l l

5ttachment To LER 81-15/03L Beaver Valley Power Station Duquesne Light Company Docket No. 50-334 The current Technical Specification requirement for the low flow trip setpoint is 90 percent of the design flow, a fixed value. Ilowever, the actual 1A loop flow is greater than the design flow. The actual IA loop flow has been verified in recently-completed tests at the site. New, if the 90 percent of the design flow is to be maintained as the lov flow requirement, then the ratio of 90 percent of the design flow to ;]O percent of the actual flow will result in a percentage whic' is less than 85 percen* of the actual flow. The 85 percent setpoint was used to conservatively satisfy the requirements and also reduce the intermittent alarms until the cause can be determined.

1 e

1 e

c k'

I I!

9 i

h

.a.-