ML19351E644

LER 80-002/01T-0:on 801126,during Insp on Msivs,Damage to Valve Disc Bolt Holes & Disc Arm Bolting on Three Downstream MSIVs Discovered.Caused by Design Deficiency.Design Change Will Be Implemented Prior to Initial Startup

ML19351E644
Person / Time
Site:	Farley
Issue date:	12/04/1980
From:	Hairston W ALABAMA POWER CO.
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II)
Shared Package
ML19351E637	List: ML19351E636 ML19351E644
References
LER-80-002-01T, LER-80-2-1T, NUDOCS 8012100562
Download: ML19351E644 (1)

Text

.-

J e ccNrRotsocCx2I l l1 I I I (P1. EASE PRINT CR TYPE AU. REQUIRED INPORMATICM i .@

[o lil4 l9 A lL lJ lM lF I2 l@lIS 010 l- l0 l0 l0 l0 j0 l - l 0l 0l@l 4 l 1 l 1 l 1 l i l@l l Jg UCENSEE CQQE le . UCENsE NuMeEM JS 26 uCENSE TYPE 40 , 57 CAT 54 cN i .

C~' J I 1 l$*g'c 1 L!@j Ol 513 l 0 l 0 l 316 l4 @l l ' 1 l 2 l6 l 8 l0 l@l 7

l l l l l l@

4 40 66 CCCx1T huMa g m 64 GS EVENT DATE 34 25 PEPoAT OATE 80 EVENT DESCRIPTION AND PROSABLE CONSECUENCES h

l o i 2 I l As a resu'lt of vendor recommended inspection activitfes on the Unit 1 Main St'eam '

~

i

!io ,3, [ Isolation Valves (MSIV's), damage to the valve disc bolt holes and disc arm bolting on

. . . . . -- ~. n ... . . . . . . . .

!. g o i 4 l lthe three~downstriain MSIV's'was reve~ a led. This Unit 1 MSIV damage resulted from loIsl l inadequate locking devices on the disc arm bolting, allowing the studs and nuts to l o is i I vibrst e loose. "All MSIV's were still operable. 'However, eng neering review on 11/26/80

a ; , l l concluded that, if

not corrected, this condition could, have potentially led to.a. valve 106s11 malfunction. Unit 2 MSIV design is identical to Unit 1 ESIV dcsign. This condition was 7 s 9 reported on 11/ Zu/ du in accoraance witn teca spec o.s.l.ic. A.

. $YSTEM . CAUSE . CAUSE . COMP, . VALVE .. ..

_ ,,q , ,CCCE CCCE SUSCCCE COMPCNENT c*CE SUSC00E SuaCCCE .. .

7 loist 8

i w l a l@ l al@ 1.n_J@ l vi A l L I V W lX Ih l C lh [qj h 9 to s 12 13 it 18 19

• 20-

.  !- SEQUENTIAL -

• ' OCCURRENCE REPCRT REVfSICN LEA!Mo EVENT YEAR REPCAT No. COCE TYPE No.

O17 A8 l 8! 0l l-l l Ol 01 2l l/l l3 0l Il l Tl l-l l 0l

_ 21 22 23 24 25 27 3 30 33 32 AC oP T MEh Hours s a sN[d UP UE '.

-[.

FCA s. MA PA RER

'l33 F !@l 34 zi@ l zig 25

I z l@

,6 l Oi 01010 l-3J 40 Wg 4n l Nlg 43 l43A l@ l A l5 l8 15 44 CAUSE DESCRIPTION ANC CORRECTIVE ACTtCNS h 11 ! o i I Thf e occurrence B attributable to desien deficienev. A'desien channe to orovide a Ii!il inositive locking arrangenent for the Unit 2 MSIV disc arm boltine will be implemented "I i 6 21 l prior to initial startup. 10CFR Part 21 Information was submitted with' Unit 1 LER

_ 1ii3l l 50-348, 80-073/0lT-0. . .

Iii4 l l 7 as  :

57 T  % POWER oTNER STATUS cv Y DISCOVFRY DEsCRIPT!oN l

l t-is l l zl@ l0 l 0 l0 Ihl" NA l lC l@l

• Inspection

' $nviTY A co'0TENr

• l RELEASE 3 CP RELEASE AMCUNTCP ACTIVITY LOCATIC'N oP AELEASE.

IiI5l d @ lzl@l NA l l NA 7 a 9 to 13 -

44 45 8 PERSONNEL EXPCSuMES -

• NuuJER TYPE 3ESCRIPTION d i1!7IIofalo!@[J.j@l NA

' * * ' 's a PuscNNe'L imu'a'iEs Nuu.En otsCniPnCN@

I7 t t a8 l 9l 01 01 Oi@l NA 11 32 g

LOSS CP Cn cauACE To FACluTY TYPE CE5CRIPTION iiTI. l2 zl@l io NA -

. . g tssuf E CAIPTTCN .; ., NRC USE ONLY L2_LJ Ls[hl NA -

l llllllllllll 8015'10hh,,,,,n,, w. c. na uston, m

,,,an y, (UO5)899-5156-

~ '

~

, - _ _ _ ._..