05000302/LER-1981-003-01, /01T-0:on 810129,containment Isolation Valves AHV-1C & AHV-1D Found Inoperable Contrary to Tech Spec 3.6.3.1.Caused by Failure of Valve to Seal at Low Ambient Temp During Purge Conditions

/01T-0:on 810129,containment Isolation Valves AHV-1C & AHV-1D Found Inoperable Contrary to Tech Spec 3.6.3.1.Caused by Failure of Valve to Seal at Low Ambient Temp During Purge Conditions

ML19345F626
Person / Time
Site:	Crystal River
Issue date:	02/12/1981
From:	Hernandez V FLORIDA POWER CORP.
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II)
Shared Package
ML19345F623	List: 05000302/LER-1981-003, Forwards LER 81-003/01T-0 05000302/LER-1981-003-01, /01T-0:on 810129,containment Isolation Valves AHV-1C & AHV-1D Found Inoperable Contrary to Tech Spec 3.6.3.1.Caused by Failure of Valve to Seal at Low Ambient Temp During Purge Conditions
References
LER-81-003-01T, LER-81-3-1T, NUDOCS 8102180627
Download: ML19345F626 (2)

LER-1981-003, /01T-0:on 810129,containment Isolation Valves AHV-1C & AHV-1D Found Inoperable Contrary to Tech Spec 3.6.3.1.Caused by Failure of Valve to Seal at Low Ambient Temp During Purge Conditions

Event date:
Report date:
3021981003R01 - NRC Website

text

UCEMEE EVE.'4T A E.:C.;7 EXHIS IT,*.

g

sract n::c I f

I I

i i,. zA:s s'i ~r :a v, n. n-. in: m,ewa-c.a 1: iii I ? I Ll C ?-1 ?! 3 fgl 0101-l 0 i 0; O 0 g !. ; 1,1l1 ; i p,,

I Or 0 t

0 i vu,.*

::a s

uu-...

a u u...,.. ~,, _..,,

.~

.".,".' i L gi o r 3 r C I -t o i 3 f 0 i 2 n j 0;1 7 2;9,8g 1.g" g ;,,, y, g,1 i: eis i

s G

Fu

.sr w.n.

s, s,:.,

n.. :,:,

u llYdurYn[perfoNne kip $

Containment Leakage Types "3" and "C",

it was discovered that containment isolation valves AHV-lC and 1D were inoperable contrary

,to T.S. 3.6.3.1.

The valves were closed and an investigation of the event was.

initiated. At 1340 it was determined that the leak rate was contrary to T.S.3.6.1.2 and that T.S. 3.0.3 applied to the situation. A power reduction toward Hot Standby

,,,, was initiated. Operability was restored at 1351 and the power reduction was r

,;,,,, halted. There was no effect upon the public health or safety. This is the first oc

&c,~ teed uudet r

a a currence tur exce m ve Aeasage Irom am -a.

a w anu we nu evenc T.S. 3.6.1.s.

s~s su

.as

. 2 2.

..u.

s r.se:::

u.c,a, :::a r a:- s r 4-e l xte i he Og r S l o r e i B ig i B le,i v f A i t i vi E ni.,

m

=

n. u=:i, =,c.

=..,c:

. r. m :,

u. 2 m,r--

r

@,ai:-

i 8 1 i

t-i r01013r 1

- f i 011 I iT l l __t i,0:

=

=

m m

m

~.w-...,.

.,-.....r.:.=,

..., =.

=...,.;,.

r...,

.m r

....., =

r......

.s.._...

J X g l_ F i g l.B T @

l@

lYig [Nlgi lAl@

l PI 3l 41 0; l

[ 0 i 01-01 A

c.Ausz :ss:aur:cs As::camc:nvs 2,-

c 4s Mted to f ailure of the val.ve to seal at i,,,,l The cause of this event is attri low ambient, temperature during purge conditons.

Ir.vestigation of the event has included some g

limited testing to confirm the effects of low ambient temperature and development of a mechanism to prevent recurrence. Further containment purge above Mode 5 will

,,,,, be restricted to testing of design changes implemented for problem resolution.

e,

n::v--

e :: :.

.,e vs., :43:.., @

e sr.r.s me.

=m. sr r:.s

va.-

liese iE i 3 I li 010 I@i NA l

rB !

Engineer observation l

'.l-. u -,

Eht ?

.vwur:e.murv h l t:c2rics:.y.,23:@

l'lallq.ses Qigl

.a s.

.t.s e NA l

NA l

g 7

4 9 la i

.e as gg Pl.5:,%4b (E* ?.i..s t3

~4 s e t s O t s

• s.**:,

i i i ri 10 : 0: 0 @l zt@l NA 1

e i t.

87 f3 g

• 1. ::% % 161%s g ai g3

,Lw1f.

130*'** :%

jiit ilOi0iOl@l NA F

as t*

g.-

.:.s :. = = :.v.,:: : ne a r-Qi,

- n

sse e e,

l i s. i j Z !@l NA 1

is

! : i e t i,J'j@1,7.... s@

sac '.ss :*4tv l

NA i 'Ir:ieIitii ier

$ame of Preparer:

f

_:- g-f. /"A (CC U

,i3-% ~ 6 8

kz~t-

,.c.; g v

(SZI.C"LU~T9 SU??'" 'CV.I DEC?.21.CIC:t 5 --.)

8102180 @

~

4 SUPPLEMENTARY INFORMATION Report No.:

50-302/81-003/01T-0 Facility:

Crystal River Unit 3 Report Date:

February 12, 1931 Occurrence Date:

January 29, 1981 Identification of Occurrence:

Excessive leakage from containment isolation valves AHV-lC and 1D contrary to Technical Specification 3.6.1.2.

Conditions Prior to Occurrence:

Mode 1 power operation (100%).

Descriptia7 of Occurrence:

At 1145 during performance of SP-179, Containment Leakage Types "B" and "C", it was discovered that containment isolation valves AHV-lC and 1D would not meet.the leakage requirements of the Procedure. The valves were closed and an investigation was initia-ted to determine the import of the situation. At 1340 it was de-termined that leakage exceeded allowable limits and created a condition requiring operation in accordance to Technical Speci-fication 3.0.3.

A power reduction toward Hot Standby was initia-ted. Operability was restored at 1351 after a repeat test per SP-179 and the power reduction was halted.

Designation of Apparent Cause:

The cause of this event is attributed to failure of the valves to seal at low ambient temperature during purge conditions.

Analysis of Occurrence:

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

l l

Corrective Action

i l

l Investigation of the event has included some limited testing to confirm the effects of low ambient temperature and development-of.a mechanism to prevent recurretice. Further' containment purge above Mode 5 will be restricted to testing of design changes implemented for problem resolution.

l l

Failure Data:

1 This is the first occurrence. for excessive leakage from AHV-lC and ID, and the second event reported under this Specification.

l

/rc i-l t

N