ML19259D210

LER 79-028/03L-0:on 790910,main Steam Tunnel High Temp Switch TS 5932C Failed to Initiate Logic a Group I Isolation.Caused by Dirty Contacts on Temp Switch Circuit Board.Contacts Cleaned.Temp Switch Returned to Svc

ML19259D210
Person / Time
Site:	Peach Bottom
Issue date:	10/10/1979
From:	Cooney M PECO ENERGY CO., (FORMERLY PHILADELPHIA ELECTRIC
To:	Grier B NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION I)
References
LER-79-028-03L-01, LER-79-28-3L-1, NUDOCS 7910170372
Download: ML19259D210 (1)

Text

{{#Wiki_filter:'

                         tiu
                            ,                     e
                                                                                   ,                b t. eu . .                   *
                                                                                                                                       , 4 g r i .i !
                         ' f. 5           'W l a . i - W e j ,1. : ory C o r . 5,r,

( 3 i P.n i , , ,, t r. 9 <if I': i, e

                                    - t '.c . fc T ic 15 refers to failure of a Vain Cter T r.nel Eich Te;; e rs_ ture c ; t.                                                    The ccverninc le:d_nici.. CP cific M acn ir 1.-.L.

d P00RORE(Al u s u m a Aa nic. t A co, cc w LICLhSE E I VEN T HL POR T t->.. . r' = Lj [_ L j_ {j it t t ar.t e rns t on i vs t a t t at c'cipio ra ns"e: Tic a 10

                       '- l t. ]F P !t l1 IF I -

m.-{.r,..- Mi d. I o ],, j. -o- r p, T-!.;

       -  i I-

_ 1"4 -[ r J Q' t l ; l: i l1 i.7 .s,, ,,t N.,

                                                                                                                                                                                                                                                  !       !   l."

tt.v o 'l ",",'

    ,          .                                        l}D . [ 5 I; MO,2 l /_idd_Cd_9.J__1_l OL7 ! ? .(,[ldI i'0'.7ij_j'[

l

                                                                                                                                                                                ...-           s..

s . t . t er .

                                 .                      m-                           r c. n a u s i                          r- >r-
                                                                                                                                              ~

QQ L Wile atJ.cwer, durinc perfcn=nce cf a reutine surveillance test, Eain EE.] L _ S. tea: Tunnel E yn__Ter;erature switch T 932'; faile:i te initiate an "A" S;G ' Icgic Grcq I isolatien. Safety signific1nce is tinical rince redundant [G l. _te=perature switchec were cperable.. _ _ _ _ _ _ _ _ _ , _ Ei] L_ _._. __ Ec7[. l i IW l, .

                                                                                                                                                                                                                                    .g
                                                                                                                              .                                     r                                            . -                 . ,

8, . [C 1 L !@ [E_J[ [_A,j(' [I! E l 3 l T l R f Uj] [{J[ W 8

                       ,_.                                < .                                                           ,3                                                                                        s 1                         L O                                                                       [, J                  [0l2l8!                                    [d                                                   y n

[_7_L9_] is [0_[]_J , [_J QI s s e, 3;, 99 6, e . - e ,r j ]hEj[ ["_J[) (_0! 01 0 I [.!jj ) [_ Nj (] l l l7l c a -.i v a ; n.n a w: i.c , e a r ,n...r_.i E j [,,TLe cause was dirt g entacts en the tergera_t g e cwitSh circuit beard _ q][ (Modu-Flach series 600). The contacts were c1cped im=e.diatelyj the g g L tecpernture switch was tested natisfactorily and returned to service. rTO L F, Ir1 L _ t Otas{ .s ( t a TL 1 ('p 8 'Q , .1 Drt ;s tV. tsg O$ f.( r14 t i% ,l FI'Il [F,j(j) [Oj_p[))@l . N/A l W '] LSurveillance Test A ". 9 8 9 ( ON 7 8. *41 A eas e 9 4 s +6 Its t a 'l m Ae he A t e % 19 Y tD'A1 ' p*. f 8 ist al4t L,LLd, L.ZJ 6 L. zJal N/A j l N/A f Jr 1 5= ,

                                                                                                         . . ( '.

[ M @ ; 0_ [0 j QI, W ' d ,, N/A 9, r et ( e f ,

                          ,. ..                                     .   . univ (P)          '
                                                                                                                                                                                                            )'
                                                                                                                                                                                                                                             ' ~

p

           ) [D_.[QJ_0]j 'l
          ,e N/A                                                                                            >
                                                                                                                                                                                                                                         ~        -

t *

• g es 4 1 18 A( si . Y v J r is s 3 ~,

M f T9 S'I, f N/A #8I 03 70 '

                           " ' '                                         ^'                                                                                                                                                                                        e

( t@t 1 , W1 g;l

 ,       n ,                          m N/A s
                                                                                                                                       //                     i b                 u l l1fl)ll1l 1ll s.

j','( j yiLg r N A*% os enti Ame n M./J.'Conney ,,.oy (21t) 8L1-5020 _ _ , _ _e * * - h6 ' "}}