ML20104A093
| ML20104A093 | |
| Person / Time | |
|---|---|
| Site: | Peach Bottom  |
| Issue date: | 01/29/1979 |
| From: | Daltroff S PECO ENERGY CO., (FORMERLY PHILADELPHIA ELECTRIC |
| To: | Grier B NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION I) |
| References | |
| NUDOCS 7902260070 | |
| Download: ML20104A093 (13) | |
Text
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PHILADELPH:A ELECTRIC COMPANY 4
2301 MARKET STREET P.O. BOX 8699
(%f PHILADELPHI A. PA.19101 d:
S*estLos t nattner, 82tSi 848 5o01 Ektc a*C non a
h)
January 29, 1979 CV W
Re:
Docket :los.:
50-277 a
50-275 N
9 I: Eulletin 75-14 p&
,U 9
s f..,
7,H Mr. Boyce H. Grier, Director Office of Inspection and Enforcenent N
Region 1 United States !iuclear Re3ulatory Oca.*.ission 631 Park Avenue
>d King of Prussia, PA 19406 Dear 'Ir Griar:
J T;iis letter is in rasponse to IE Culletin :;o. 7:,-14,
,.f which you forwarded to us on Decer.ber 19, 1973, concerning the 4
deterioration of Cuna-!! cocponents ir. ASCO solenoids used in 9
control rod scra.1 systems.
The " Action to be Taken by Licensecs"
]
and our responses are treat;d scquentially.
f],
Action to be Taken by,Licens,ee
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e,q 1.
heview una-:; :taterisl application in your control rod scrsa syste, and Jetar71r.e the ti: e since installation, and for installed.taterial, the ti..le since packa,;ind.
c.,
3 3.e.8.E0"_3A o
The Peach Hotton Unit 2 control rod drive (CRD) equipment was delivered to the site in the third week of 1370 and the Unit 3 L
CRD equi p ent was delivered in the 43th week of 1971.
Initial l
critica111ty for Units 2 an! 3 occurred on Septenbei* 16, 1973,
,.3 and Au;ust 7, l>7u, respectively.
The datas that the Buna-:1 conponents were installed in tne valves and the dates for
-]
packaging of conpor.ents have nst been obtained.
'i l m
C A
700226001o' 4
"r Soyce !!. Grier Pade 2 The CC; sera... pilot valves are listad by C?.; Unit nu Ters ia Tac 1?s I snu !! tita t. t 9,tes an..aic; s;ocifia: S na-.; _4rta sere re.olac3d on Pecen lottou. nits 2 anc 3 res; ectiveli.
T.; e packa;in; cates for replaceaent parts already installe2 are unavailable.
2.
Report the results of the review set forth in iter. I above and describe your schedule for replaceuent, both in response to this Dulletin nnd for periodic saintenance.
L Respo_nse
[
3esults of the ravies of ite.r. 1 is stated in ite 1 and listed in Tables I anc II.
The recommended replacement of Suna-:i conponents set forth in General ~1ectric SIL :;o. 123, Revision 1, Supplement 1, will be coapleted by the end of eacn unit's next refueling outa;e in CRD screa systen solenoid valves.
For Peach Eotton Units !!o.
2 and 3 respectively, the next refuelin; outages are tentatively senedaled for the Sprin; of 1980 and the Fall of 1979 In an effnrt te expedite this work, aaintenance will be done on as many solenoid valves as is practicable during outages which cay occur prior to tne next fuel cycle.
3.
Describe the bases for your schedule of replacenent identified in response to ite: 2 couve.
J,stify any proposed replace. tent tide in excess of three years.
'3e.spo.g sy, Philadelphia Electric Co..:pany enbarked upon a periodic naintenance prs;ran in accoroanca with reco.nendations fcund in 3eneral 11cetric Z:*-
s.
12 !,
- arch :1, IC75 and General :lt:tric OIL lo. 121,.ievision 1 Janaary 30, 1975 followin; tneir issuance.
Tae scope of tna..taincenance acr% that has ce3n co.apleted is listed in Taoles I and II.
The aaintenance procraa was subsequently altered to cocply with the recontendations set forth in Jeneral Clectric SIL ilo. 12, aevision 1, Suppleitnt I,
August '975.
The maintenance work cor.pleted in accordance sitn
.the latest SIL is also listed in Tables I and II.
Cone 033 scran pilot valvss fro.; both Peaca Ectte: Jnits have nad 2una '; parts repisced in co:pliar.ce sit'a One. cst recent SIL.
A re;resentative sanple of tne Suna-;; con;onents wnic:. sere replaced in ti;e solenoid valves sera insoectei cy too plar.
r.'cintenance en ineer.
Tanre were no cor:ponent fsilures f:ur.1, but evidence of hardening of sov.e core asseably couponerts and subasse bly gaskets was observed.
y 9
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'A Gh k[3
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r.
loyce 3. G 'er P:;e 3 n
C:n3
?$
Ji per;a i:
- 2. i.: c. e n ; n c e : a.;r e
. 1 : c.
'2110.43 ;M recon.ensatior.s of General Iloctri:
!L.' c. 12;,
.T e vi s io n 1,
.J Sup;1enent 1.:ss been inplanented.
This SIL under Pecc:. : ended Action states, " General Electric recc rends that 3'..' P o.3 e r a t o r s J.
establisa a preventive maintenance pro:ra..: to replace all core 1,
assemblies, diapara;ms and associated p arts in all CRD scraa
'S pilot valves, backup scram valves, scra:, dischar;e volune vent C'
and drain pilot valves, and scrat disc:.arge volune test valves at it periodic intervals.
The Duna-N parts used in these valves have at least a seven year shelf and in-service life from the j
- .y packasin; Jate on the rebuild kit.
Taus, the valves should be Cd rebuilt periodically to assure that the Suna-N parts are not used
- A in excess of seven years.
It is reco'..ar.ded t::st the.Jork be
~,.
scheduled in any one outa;e such that the associated C.40s are selected fron a distribated chec'<erboard pcttern.
The renainin;
- j valves can be rebuilt durin; subsequent outa;es."
- 1 7.
- l Peach Cotto's Units ::o. 2 and 3 have experienced no
,.6 solenoid valve failures related to deterioration of Buna-3 material in CPD scram systems.
This successful operatin; record, in conjunction with the results of our.aintenance and inspection prograns, and our past and present periodic replace:.1ent programs insure the reliability of the CRD scra syste:.t.
s v;
Very truly yours,
- '
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cc:
United States Nuclear Pelulatory Cc:.:.11ssion Office of Inspection an: Enforcement
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Division of ?.eactor 3;erations Ins; action 1
la sia i n.;t o n, 2. C.
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TABLE I FEACH 30MC't CI!T ? C"D N'? J' 3*:2':0D M,C'. E':A':2E CRD Press and Exh 3cdy Ccre Sub-asce:bly
!*o.
Li arhrnres Ciskets Asce:blien Casketo 18-03 5/10/77 5/10/77 22-03 5/10/77 5/10/77 26-03 5/17/76 5/17/76 33 -03 5/17/76 5/17/76 3L-03*
9/25/78 9/25/73 9/25/73 9/25/78 3E-03 L; 03 1L-07 5/17/76 5/17/76 16-07 5/17/76 5/17/76 22-07 5/17/76 5/17/76 26-07 5/17/76 5/17/76 30-07 5/10/77 5/10/77 3L-07 38-07 L2-07 L6-0l*
9/25/73 9/25/73 9/25/75 9/25/78 10-11 1L-11 18-11*
9/25/78 9/25/78 9/25/78 9/25/7S 22-11 26-11 5/17/76 5/17/76 30-11 5/17/76 5/17/76 3L-s1 38-11 5/10/77 5/10/77 L2-11 5/10/77 5/10/77 L6-11 50-11 06-15 10-15' 9/25/78 9/25/78 9/25/73 9/25/78 1L-15 18-15 22-15*
9/25/76 9/25/78 9/25/78 9/25/73 26-15 30-15 3L-15 38-15 L2-15 Valve replace!.
1 1
1 TA3tE I (Cent'd)
CR3 Precs 1..d Exh 3:27 Core Sub-aa:e:bly th.
Di gir.-e cer c.-kets ance.blio, C,-ke e L6-15*
9/25/7e 9/25/7e 9/25/78 9/25/76 50-15 5L-15 02-19 5/17/76 5/17/76 06-19 5/17/76 5/17/76 10-19 5/17/76 5/17/76 16-19 5/17/76 5/17/76 18-19 5/17/76 5/17/76 22-19 5/17/76 5/17/76 26-19 5/17/76 5/17/ 6 3c-19 3L 9/25/73 9/25/7S 9/25/78 9/25/73 38-1?
5/17/76 5/17/76 L2-19 5/17/76 5/*7/76 L6-19 5/17/76 5/17/76 50-19 5/17/76 5/17/76 EL-19 5/17/76 5/17/76 5a-19 5/17/76 5/17/76 c2-23 06 9/25/73 7/25/75 9/25/78 9/25/73 1o-23 1L.23 13-23*
9/25/79 9/25/7e 9/25/7e
,9/25/78 2:-23 26-23 30-23 5/17/76 5/17/76 3L-23 5/17/76 5/17/76 38-23 5/17/76 5/17/76 L2-23 5/17/76 5/17/76 L6-23 50-23 SL-23 58-23+
9/25/73 9/2 / 3 9/25/75 9/25/75 02-:7 E/17/ 6
?/1 /S 06.-77 5/17/~6 5/17/76 10-27 5/17/-6 5/.7/76 1L-27 5/17/76 5/17/76
- Valve replacel.
2
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s TA3I2 I (Ccr.'.'d) l OTtD Press ar.d D.h 3:dy.
Coro Sub-Asce:bly
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tinhr m e f,* s ek e t s I r.t re bl i o n
'hrkets 18-27 5/17/76 5/17/76 i
22-27 5/17/76 5/17/76 26-27 5/17/76 5/17/76 I
30-27 5/17/76 5/17/76 l
R-27 5/10/77 5/10/77
+
39-27 5/10/77 5/10/77 L2-27 5/10/77 5/10/77 l
L6-27 50-27*
9/25/78 9/25/78 I
3L-27 1
5S-27 9/25/78 9/25/73 9/25/75 9/25/78 02-31*
C6-31 j
10 31 1L-31' 9/25/73 9/25/78 9/25/78 9/25/78 31 l
22-31 5/10/77 5/10/77 l
26-31 5/10/77 5/10/77 30-31*
9/25/73 9/25/78 9/25/78 9/25/78 3L-31 5/10/77 5/10/77 23-31 5/10/77 5/10/77 L2-31
_L6-31+
9/25/78 9/25/70 2/25/78 9/25/78 i
53-31 5L-31 58-31 02-35 06-35 i
10-35*
9/25/78 9/25/78 9/25/78 9/25/73 th-35 1
18-35 5/10/77 5/10/77 i
22-35 5/10/77 5/10/77 f
l 26-35 5/10/77 5/t0/77 p.35 3L-35 36 35 j
L2-35*
9/25/73 9/25/78 9/25/78 9/25/78
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' Valve re;1 ace.l.
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TAET.E I (Cent'd)
CRD Press ar.d D&.
3ady Core
$b-2::::ce.bly 1:o.
Diuhrv e Ciekets
- .ree olios Cukete t
L6-35 50-35 EL-35 58 --
02-39 c6-39 10 39 14 39 18-39 22-39+
9/25/78 9/25/78 9/25/78 9/25/78 26-39 30-39 3L-39 5/17/76 5/17/76 38-39 5/17/76 5/17/76 L2-39 5/17/76 5/17/76 L6-39 5/17/76 5/17/76 50 -39 5/17/76 5/17/76 5L-39 58-39 02-h3 5/17/76 5/17/76 06-63 5/17/76 5/17/76 10-L3 5/17/76 5/17/76 1L-!.3 5/t7/76 5/17/76 18-L3 5/17/76 5/17/76 22-L3 26-63 5/17/76 5/17/76 30-L3 5/17/76 5/17/76 34-L3*
9/25/78 9/25/78 9/25/78 9/25/78 36-L3 42-63+
9/25/78 9/25/79 9/25/78 9/25/78 L6-L3 50-L3 5L-L3+
9/25/78
?/25/73 7/::/73 1/25/75 Sa-L3 06-L7
-- 67*
9/25/78 9/25/78 9/25/78 5/25/78 1647 Valve replaced.
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TABLE ! (Cs..t' l)
CR0 Press.v.i hh 3ody Core Suc-as:cebly
- n.
- i, e-.me cenu
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" e< e a 13.L7 22-L7+
9/25/75
?/25/75 9/25/75 9/25/73 26-L7 30-L7 5/17/76 5/17/76 3L-L7 5/17/76 5/17/76 38-L7 5/17/76 5/t7/76 L2-L7
- 5/17/76 5/17/76 L6-L7 5/17/76 5/17/76 50-L7 5/17/76 5/17/76 5L-h7 10 51 1L-51 18-51 5/10/77 5/10/77 22 5/10/77 5/10/77 26-51 30-51 5/10/77 5/10/77 3L-51 5/10/77 5/10/77 38-51 L2-51*
9/25/73 9/25/73 9/25/7e 9/25/78 L6-51 50-51 1L-55 16-55+
9/25/73 9/25/73 9/25/78 "9/25/78 22-55 26-55 30-55 5/17/76 5/17/76 3L-55 5/17/76 5/17/76 38-5s 5/17/76 5/17/76 L2-55 5/17/76 5/17/76 L6-55 5/17/76 5/t7/f6 16-5) 22-59 26-59 1 ')
~/*0/77
!/%/77 JL-59 5/17/76 5/17/76 38-57 5/17/76 5/17/76 L2-59 5/17/76 5/17/76 Valve repla:ed.
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5L-15 1/20/77 t/20/77 02-19
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?/20/77 1
3L-19 1/11/79 1/t1/79 t/:i/7) 1/11/79 33 19 L2 19 Li-19 50-19 5L.19 58-19 l'
02-23 1/20/77 t/20/77 c6-23 10-23 l
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06-31 10 31 1/23/77 1/2c/77 IL-31 18-31 1/20/77 1/20/77 22-31 1/11/79 1/11/7?
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t/t?/79 1/11/79 1L.35 t/20/77 1/20/??
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