05000302/LER-1981-022-03, /03L-0:on 810412,following Reactor Trip,Main Steam Isolation Valve Msv Found Inoperable.Cause Undetermined.Mods Performed to Improve Valve Operation & Reliability. Functional Test Results Satisfactory.Operability Restored

/03L-0:on 810412,following Reactor Trip,Main Steam Isolation Valve Msv Found Inoperable.Cause Undetermined.Mods Performed to Improve Valve Operation & Reliability. Functional Test Results Satisfactory.Operability Restored

ML19350D771
Person / Time
Site:	Crystal River
Issue date:	05/11/1981
From:	Hernandez V FLORIDA POWER CORP.
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II), NRC OFFICE OF INSPECTION & ENFORCEMENT (IE)
Shared Package
ML19350D768	List: 05000302/LER-1981-022, Forwards LER 81-022/03L-0 05000302/LER-1981-022-03, /03L-0:on 810412,following Reactor Trip,Main Steam Isolation Valve Msv Found Inoperable.Cause Undetermined.Mods Performed to Improve Valve Operation & Reliability. Functional Test Results Satisfactory.Operability Restored
References
LER-81-022-03L, LER-81-22-3L, NUDOCS 8105190231
Download: ML19350D771 (1)

LER-1981-022, /03L-0:on 810412,following Reactor Trip,Main Steam Isolation Valve Msv Found Inoperable.Cause Undetermined.Mods Performed to Improve Valve Operation & Reliability. Functional Test Results Satisfactory.Operability Restored

Event date:
Report date:
3021981022R03 - NRC Website

text

......

t.!CENSEE EVENT RE.: CAT EXHIBIT I,

coNra:L sL:Cc l 1

l l

I I

l ies.rA:s 7 INT cc Tyre AL*. arc.;tr.ts iNac wricm 1

0lgl4 I 111 l1 gj i g io e i l i r i I.1 c at ?! 3 l@i 0 l 01-10 i 010 l 0 0 l 10 1 1

1 I

P d 9 lac &A448 C; 1 8*

'3

,WC3%54 %we&a

.S s

c3%st f.eg

.4 si sa 7 se CN 'T Iosil

,.,,".' l L g[ 01 510 l -10 l 310 l 2 Gi o i 4 ' 1 i 2 I 8 I 1 @l Or 5 1 1 1 1: 8 lg l

7 a

es en ccCs47 s yssa 64 si tw aa r : art I*

in 4*=T:47 4;

EVENT CESCAs7T1CN AND,mC8 A3LI CONSEC'JENC15 bc g,,, g At 2230 following a reactor trip, icwas discovered that Main Steam isolation Valve MSV-414 was inoperable contrary to T.S. 3.7.l.5 and 3.6.3.1.

The affected pene-go,,3g tration was isolated and maintenance was initiated. There was no effect upon the gog, t health or safety of the general pub 1'ic, This was the first occurrence for MSV-414 g o.6 l 1 and this is the first event reported under T.S. 3.7.1.5 and the thirty-fifth event

[ o i r l I reported under T.S. 3.6.3.1.

toisii r

as 3T3r1%8 CAust Ca.sg C:ve.

v a.,v t C00E C Ce St9CO:8 C uecN4%r t:34 maC ct

%4c:ct loist I c I n l@ lE l@ Q@ l VI A ll f V 101 P l@ y@ g @

7 4

80 ts 82 la 85 19 23 s e c,u s *.rs a u CC ;n.t%C:

ntr:wi

• re'Sa C N u

IVE9r'tA4 m t Ca f '.o.

Ct 7 vet go

@,ag.o [8 I Il

[-.-j l of 2 l 2 l l/l [013l l Ll ll l0 l

_2.

=

u 2,

a a

2.

2 u

Wi.'. '.WC '

c!.'teEr 5051T:"

cu.s @ ^;I,'Wis'

,C.".T.

"i~.157

..T.?#21,.

IFI@(Z,j@

lCl@

lZl@

l0l0l010l l Yl@

U., @

l Al@

l RI 3l 41 (

.2 2

2.,

c causa ctsexwrics an= c:ams:nvi a scNs @

li,o1i The cause of this event is undetermined and an investigation is in progress. A IieiI I sunnlement will be issued when the cause is determined. Modifications were per-Ie i:1 1. formed to improve valve operation and reliability for all MSIV's per MAR's 79-9-74 g,,3gI and 81-4-75.

Functional test results were satisfactory aid operability was re-i g,,,,i stored at 0300 4/19/81. No further corrective action is deemed necessary at this s

• time. m

1. NE cr 4 =srat'.s h

$is N $av

.scevtav :ssc*

• cm h s

%*;wea Ii ! s i L.9.J@ I 01010 l@l NA l

l A l@l Operator observation l

7 5

3 8

t2 es me

.g 33 l'!alLZ.j @ lZI@l

...:vyr e,ac m ir, @ l

<cc,,os...,u u, @

. uu.o e..,uu r NA l

NA l

7 8 9 IJ t

a.

.s

....,sa n,c.u.t gg n

=is:...r,e, @

u....

r,n lierll0 l0 l0 @lZl@l NA l

n..:,sd'.m'I.o

• =

wuvst.

Ots:M ' r?'C %

li l e l l0 10 10 l@[

NA l

7 5 3 ss I:

g;

• 033 C. C4 Dav.a 't,g~3 3 84C u r' l

TM Ogs; ia-fiTTI 1Z l@l NA i

-'~

m,* ~ ',',':..,,, as @

81 aaeeseontv 1:cillYf@l Newspaper release concerning valve on 4/16/81 & 4/20/l 'liIIeIiii: ier

Name of Preparer:

g*f~g,*-@ W b

,-css. (904) 795-6486 s:

f l

f

~

(SEZ AITACEID SU??T*3TJ_U Di?OR.'iCICN 5

)

8105190N

i f.-

r-SUPPLEMENTARY INFORMATION Report No.:

50-302/81-022/03L..

F:cility:

Crystal River Unit 3 Report Date:

May ll,1981 Occurrence Date:

April 12, 1981 Identification of Occurrence:

Main Steam Isolation Valve MSV-414 was inoperable contrary to Technical Specifications 3.7.1.5 and 3.6.3.1.

Conditions Prior to Occurrence:

Mcde 3 hot standby (0%).

Description of Occurrence:

At 2230 following a Reactor trip which occurred during a Reactor trip recovery, Main Steam Isolation Valve MSV-414 was discovered to be inoperable. The affected penetration was isolated and main-tenance was initiated.

Designation of Apparent Cause:

The cause of this event is still undetermined at this time. An investigation is in progress; a supplemental report will be is-sued when the cause is determined.

Analysis of Occurrence:

There was no effect upon the health or safety of the general public.

Corrective Action

Modifications were performed to improve valve operation and re-liability. MSV-414 was modified per MAR 79-9-74.

The remaining MSIV's were modified per MAR 81-4-75.

The functional test re-sults were satisfactory and operability was restored at 0300 April 19, 1981.

l Failure Data:

i i

This was the first occurrence for MSV-414 and this is the first event reported under Technical Specification 3.7.1.5 and the thirty-fifth event reported under Technical Specification 3.6.3.1.

/rc l

I b'.

J