ML20091A575
| ML20091A575 | |
| Person / Time | |
|---|---|
| Site: | Monticello  |
| Issue date: | 10/31/1977 |
| From: | Mayer L NORTHERN STATES POWER CO. |
| To: | Stello V Office of Nuclear Reactor Regulation |
| References | |
| NUDOCS 9105160389 | |
| Download: ML20091A575 (20) | |
Text
.
NSMMAT0'lY 003'.E 5 C01Y NOMTHENN 8TATES PoWEM C0MPANY
.,~~....m...,~~.....
October 31, 1977 p
g
//
)
\\
Mr Victor Stello e' ;
Division of Operating Reactors
$,9/*9
&,4 IS//,, y U S Nuclear Regulatory Ccunission 0
Washington, DC 20555 g
Dear Mr Stellot 4,
,g FDNTICEllh NUCIZAR GENERATING p1 ANT Docket No. 263 License No. DPR-22 Documentation of Basis for Continued Operation Sequential SRV Actuations of Isolation Events At the request of the NRC Staff, the Mark I Owners Group and General Electric rep-resentatives met with the NRC Staff October 27, 1977 to discusa potential influence on Mark I con',ainments of SRV sequential actuations associated with isolation events.
In that meeting General Electric presented a preliminary evaluation using most probable loads basis and short tem program acceptance critoria for all operating plants.
At the conclusion of the October 27 meeting, Staff requested documentation of the basis for continued operation and requested consideration of ccanitinents to operational procedures to reduce the probable incidence of SRV multiple-valve sequential actuations, said documentation to be sulnaitted by November 1,1977.
Further, NRC Staff indicated an intent to fomally request that a plant-unique assessment be provided witSin 60 to 90 days, with such assessment to be based on the conservative General Electric dynamic model prediction of sequential r.n:1tiple-valve actuations, application of conservative factors for correlation of cultiple and consecutive valve actuation effects, and use of the short tem program acceptance criteria.
This submittal is believed to provide all of the requested information, including that which Staff indicated may be required within 60 to 90 days.
'Ihe Monticello plant has eight safety relief valves with all setpoints at approxi-nately 1068 psig. All valves arc by Target Rock.
Each SRV discharge line has a recorded tenperature monitor, a pressure switch monitor, a tvo inch vacuum breaker valve, and an eight inch vacuum breaker valve. All vacuum breaker setpoints are adjusted to be equal to or less than 0.2 psi. The pressure switch monitor set-points are approximately 5 psig and provide input to the plant computer sequence-of-events monitor for specific discrimination of SRV actuations and closures.
9105160309 771031 PDR ADOCK 05000263 P
pop
1 NORT)
FtN OTATECO POWEER COM, 4NY Mr Victor Stello page 2 October 31, 1977 Hont icello plant -l'nique Trannient Analysis The purpose of using the transient analysis mcdel was t o predict the namber of SRV's which might participate in multiple valve consecutive actuations for Monticello isolation events.
The results of this analysis indicate that all eight SRV's will open and close in perfect unison for all initial and subsequent actuations, in-dependent of the magnitude of demand for over-pressure relief capacity generated by the cass-energy transient of the isolation event.
In the Monticello case this is n(ither a prediction nor an analysis result.
It is the consequence of model assumptions that valves of like nominal setpoint, specification and manuf acture will perform with exactly identical characteristics for every actuation of every valve.
Qualification testing of Target Rock valves have demonstrated significant variations, within the limits of specified performance, for pilot actuation delay time and ma i n di s c s t r oke t ime.
Because of the variability of and relation between these two characteristics, it is quite possible for the transient pressure to exceed the ef fective setpoint of all valves and have the pressure reduced holow this level by the first-to-open valve, with no other valves actually actuating.
Two i s oi nt i en events from full rated power have occurred at Monticello.
In both cases only a single valve opened f or even the initial actuation when all valves were adjusted to the same nominal setpoint.
From this experience we must conclude that singic valve actuation is the typical characteristic, and that the all-valves, t.mitiple actuation, resulting fran the model assumptions is the remotely prebable event.
Attachment C provides a summary of four isolation ev(nts which have occurred at Monticello since initial operation.
For your underst anding. Attachment C also includes a summary of relevant design changes and procedure changes since initial operation.
Although the transient analysis model grossly over-predicts consecutive multiple-valve actuation of all eight SRV's, compared to experience of single valve actuation, the eight valve consecutive actuation is used for purposes of con-servatism as requested by the NRC Staff.
Justification for Continued Operat_ip1 Attachment "A" provides the basis for justification of continued operation of the Monticello plant in light of the potential influence of sequential multiple valve actuations.
This is essentially the preliminary assessment for Monticello as presented by General Electric in the October 27, 1977 meeting with NRC Staf f.
This assessment in our opinion is reasonabic and conservative, and concludes that STP criteria is more than satisfied with limiting strength ratios of.24 for eight valve consecutive actuation.
This assessment is especially conservative in light of actuni operating experience that single valve actuation is typical of isolation f rom rated power.
NORTI
.RN OTATED POWER COM. ANY 4
Mr Victor Stello page 3 October 31, 1977 lio f urther procedure changes are contemplated in light of procedures in ef fect since July 25, 1971 and as further revised January 6, 1977.
plant-Unique Asses ment end Action plan in the October 27, 1977 meeting with liRC Staf f, Staff indicated a requirement for plant-unique assessment using multiple-valve consecutive actuations as predicted by the General Electric transient analysis nodel and tuore conservative correlations for multiple valves and consecutive actuations.
The 11Sp assessment for Monticello on the request basis is presented in Att achment "B" with the sternary and c(uparison to the General Electric preliminary assessment shwn on the attachment "Sutinary".
Again, we conclude that the assuttption of an 8 SRV multiple consecutive actuation ir, cowrvative in the extreme in light of operating experience that a single SRV is typical for even the initial actuation for a rated pcuer isolation event.
The une of arithmetic sum of participation f actors is conservative for evaluation of support structure loads because it assumes that both structural response and applied loads combine linearly in ccanposite.
The use of peak stress of all runs and Sl<SS ccinbination of participation f actors is in itself a conservative method of evaluating shell stress; this is illustrated by the ciretanstance that the same approach bounds the three-valve test results where direct load participation might be expected to be more d(uninant than response participation.
Since fcr the extreme assumption of 8 valve sequential actuation all elements of the structure are well within STp acceptance criteria and also within a few per-cent of code allcvable stresses, no structural tuodifications or procedure changes are warranted at this time.
Yours very t ruly, he YW
/
L 0 Mayer, pE Manager of lioclear Support Services IDM/Gml/ak cet J G Ecppler G Charnoff MPCA - Attn: J W Teman
I I
i UNITED STATES NUCLEAR RECULATORY COMMISh10N NORTilERN STATES POWER COMPANY HONTICELLO NUCLEAR CENERATING PIANT Docket No. 50 263 License No. DPR-22 l
l LETTER DATED 0ctober 31, 1977 RESPONDING TO NRC REQUESTS FOR INPORMATION ON CONTA1104ENT DESIGN Northern States Power Company, a Minnesota corporation, by this letter.
dated October 31, 1977 hereby sulaults infonnation in response to NRC i
requests for infonaation concerning the Mark 1 Contaitunent.
4 This request contains no restricted or other defense infonnation.
NORTHERN STATES POWER COMPANY t
N Id>
By J Wachter Vice President, Power Production
& System Operation on this 31st day of October, 1977
, before me a notary public in and for said County, personally appeared L J Wachter, Vice President, Power Production and System Operation, and being first duly sworn acknowledged that he is authortred to execute this document on behaH of Northern States Power Company, that he known the contents thereof and that to the best of his knowledge, infonnation and belief, the statements made in it are true and that it is not interposed for delay.
/WM I
McWioM
^^
.DENISE E. HALVORSON NOT AMY PueLIC. WN>d sof A I
HENNEPIN COUNTY u commi,e tir. on m, wei r
- ::.::: m m o+ m e m e 2:... ::
v
flutSch i
w Project N 840 bN8 *(@ ADS File No.
l C
oaner. AbEIAEEE_jhin P0ivfP $0 cuent. /1xmLSrAlfLBMt do.
JTrACHMfNr 4 GF losos d4LCVLAr/0V AffMb A, Torus Adra Arweini fremes (onreartir plus afam)
- t. Mornwao ye Ai6e m 7k r Es m s NtoBW 45*
norAv Mibo47 PldWT fBW BoinM w&TTEL/Hf W47Ettmf
% *'/8
$6 */S Sf *'/9 4
1 0
41cv7/artio 3531 psi 2474 Mt 2287 Ps/
Pit 6mm O 3730 M1 27/0 psi
/6 M iti l
(M4X.(dW.or77sr/,i?0/)
.N/: @MMT/. 7hr N/%CT M. 4< 2-l9'&5 71, Pimsm quu ecoc M,su Qt httscurkrica ry Aitt Cruf eN i
feed PiL6hM Pet 1EHRhoN, S.6 D Bot of 1040$ N40 A $7Rf.$$ CF kcQpsi mio or statss a /5' ro ster.ss a sorrow:
27/0*
4000/3730 4
RArto r
/ 0 72 ti.sc A68 l
SIVCf PIL62]M NMBTTb 572fSSES COMfA6Bf' Will M7N A1047/cftl0' Df7ERMINF TNT $72ESS AT TNf' boTT&M of MdNTICf4to 44S/M9 TW SfMr Rfi/0 hs bf!6RMiNfD fr PILSRIM.
l
[
54/9 m _... j -....~ % /f D
)
l 54/o t kr10M W10205 Revision p
gj ~
Prepared By/Date M /d2ID g
g l
Checked By/Date
mtech San Joos, Califomia Project _ [f File No.
0*rer _JF Chent - A'SN 1
2, $Nt/j. GrRCSS /WutT/Rf' IAuf 0lut!*/Pt./EE nuarinite fee 8 vAwes (rrst oar s BAr D)
LHY9 fnvM Bf V D 4
3 3
2 2
1 J
~
Bir ra N
A 6
8 f
f C
O Mf ?ICIPC0 t.
ffCicl$ % ft,
/>t/L M u f 2
,2
. 4-
.4 4
.4.75 75
/.O Pi 6f 3%ED ON En)fCTfD AliMum 0N Geb$*[,2'*4'.4't T =. 75 't / O '} y' = /47 I
hfuln9uSE foe 3 v.VVf>
J2btri TF37 M SOLTS Sk!)
Tour f 3.4 hi BAY D kYn 410WT! 7EST 2( M r Test //
4.252 ho bay CDC A NENb/A C 1757 /ti S.2/d kso bay cpf S vat t't 5255 *[/.c oI *.75 ]:'
_s
&Leripuf72r (4.252 + 5.2/B),5,,3 9
.5 c.% ~ /.16 3.4 ccMfrY,'F4E rc kvCM T2ot MEEAbr CT.'f:~5 TNtEEfoer USC S0S$
3.
OvMMAP/ of /flot.T/PL/(RS fac 6 vtLVfS To DETERM/N( ynGS Ar ib770M cr reeus fdw/ V7 /8 = A Q8 wcwsf twM 1 v p r 70 3 vat un
= /. 39 w ee n r fro M / sq w r to 8 v4 wes r /. 67
- 4. MouTictuo Ccwstconec &Lyr 47uAriou PrSotTS 56 /8 ni useur/. 7Esr EFM' 1757 'c2 6.957 hr APN+ Dix C i
TEsr 763 6.976 hi TEsr /602 9.066 hi (20m TQLC /2-6 (P6 4'? 4l Her Pop /~f(TOR M TE$r IbO3 : 2.b9 inr /605 9 847 bi f
\\ //K /EAE S7EESS AVEPAGr TAcroe I.9) AT!WE, SICCC THERCrot'e VCR)' ton $ERV Revision Page 42 Prepared By/Date p/d 2hN ng 3
Checked By/Date
nutech San Jose, Cellfornia Project IM' File No.
Owner Wh?
Cinent -. NSA s,
Mayrecuo Ska Cr.ccsscs Pasr.vra sy CJ l
uraaeANr pws ar> cia srerss Octs xor wcwu srea) 1W uru.sretss = 9847(i.oe): /0635 Ai j
isais n etrou nv.er w ecsuirs,ce sGis 0t:rit05)
\\
85W saa :arss: 9847(i.ob)(l.39): /4780 isi (ci.vwin
)
)
/?s/0fJ//A'(ff.or)
{C616ruBeamC 3 v4ur incrw PE4r erwsterss s6is 8SPV
.cata Ters.s: 9847(/.08)(/.67): i77K) Psi j $6 /d TC B07/04L 8 vAwr FAcTcc j
[ PE4r &&T M S77if35
- 8. dCloinN 40fDS
/. 4kir/PW dur (Acroe DiDdi/Atc 'W
$$. Col.. w.40 RPricimrioW B4
.vt4 Sot o is 3 g 0 nlc70e Test /
D 202.0"
/0 M d.N 3 Tf57 2 6
84.5 0.42-
)
rtS7 5 f
/6.34 C, Q2
(
TEST 3 8
/ 9. G 0,/0 l
fisr 6 f
/8, f 6,Q C) f 55 W rnr4 4
/0, "b 4 0.05
'f0l, ust 7tst 4 f,
/0.34 0,05 usc itsr4 Al
/0,34 0 05 55wis mom Mew 7/. 7EST b9rA l
Revision p
g l
Prepared By/Date
.g// /d 21' 77 of 5
Checked By/Date
nutech San Jose, Califomia Project NN File No.
O*ner -
dD[
Client.
MM hk/LT/94l~ VALVC TEST 2fSULT3 rnr Bays
- a. m uso incuri irst mairs.
Pd. 4,2 2.5
//
.MM#
15 dbf 2/$
rnr / WD d4 && 4040! 202 D 3 qwc Muiripute c
.5(2/5(304), 7 yg fd2 SESS cf P4erictRT/0W r~dcTCCS * [ /.C't.5 ~*.5~}$ r AQ9 RfTio or SPSS 7v Tf47 RESutT5 : 428l/,0)
- A / 7 8 mwr eweripufe :
$155 cf PAETICIPdTiON TfcTcts =[/,Ye.41~+56,lVs. CYr 34,l%)//
8 vfwr Mutt / PUER r />/ (lo/7) ' A 2')
i TE5rRrsutr cc2eftf r/oM FACTac
- 2. 00ASECortW @tVf QCroe 0.5 COL TEtr 2QAD cot 0
/
20'l '
Etf.
/Meurt. TGST 2fSutis Hor 702 3 /6 '
Ph 4 2 13 Hor 703 348
- Hor
/40L 360 '
dct
/605 380' iferx =
25(3/6 +348 v3601380)
,, p 202
.3 V'sion
- /
Pm M Prepared By/Date
((A/d2877
~ ~ -
Checked By/Date
San Jose, Catitomla 8EI file No.
Project Owner -
.NE Client NM 3 00N?M42Y 67 /WutT/PLIEQ coto 909 70 >/or A0P(ENC ncivAT/0N) * /. 74 lN fRffS V flt0 M.fyfttf 70 3 vALVff
- /.28
/NfWo13t~ 74'CM.i vat.d 70 6 6'4Ltf4
/. 29 PL%WY UNIQGt' MUL.'IPLICR
- /. O /
4.
$ 7A fAl W ff 7/O $
(S. 5. )
fCCCUm 7 I.* D// TIE, bt TH(lW 777.7 ft(3!JCf b'b' #
l AT mat. 5GBMil'6(4/Cf ANO y.At vf $r7 &s ~
- //$/1/C '
/5 g I
M O Bf 4'(f ? /~fot. i9 t
S Mis (oxx. CAPAc/71c 2820<
1 !aV /@ =
262 ().7/)(/.0/) = 5 5 5 <
twivrAmc l tMALC Colb S
9 SW todo:
202(/.74)(/ 28)(/.0/)* 4 54 *
)
f., 3 YAwf r%)tilPi/f/?
' Her pop 8 set t%D:
202 (/.74)(/.29)(/s0/): 456
- d 8 v4ts ( s. snhiti:
gNo7 nr ufeto S.R.
/ SW :
(3551/64+/5)/ZJ20 ~
C./9 ago S,2, 3 S6' '
(454"/64H5)/2820 = 0.22
.C3 S.R 8 Sm (458
- M4H5)/2220 "
0.28
.24 f
p Reosion Prepared Dy/Date
/O 2[ M y
l Checked By/Date 1
UW Son Jose, Califomia Ptosect gel'An AQMrioW ra no.
&PrHCb' $1ATH kwik 6 Owner cnent A!MZ8R4' Stara hru fc-fTr4CH/tsrB foN9fer47/VC 40409 C4id. of7dOD Ey A/$P 4 Cotu w doADS
/ b?ut n 4 t d wr ric7c2 (8v4w(S)
C6 cot t0A0 7 t s r r o.
E:ty sv4s. a eny o
/
D 202.0' ib 4.2 -25 2
C 84.5 5
E
/6.34 3
8
/9.6 f
/8. 5 r rtoM PARA sor n'cween 4
h
/0.34 tN b#47/& @ ??
CJf $
fy
/0,34 ust 4
//
to. 34 s
rarAL
- 3 72 '
FAdice r 372/202: A84 AfSuMis 40 /@7tet/Mrtos Fr.*Ja BUT USES D/hCr /jeD/74N.:7 /.ulCs E.
L'cWitcunvr V4wr actor Gh ' Aw) mour c a er M 4.:21 l
5 Q
TEoi 6.$ (0L.
15 COL CSdCL./At.
.ZS CCt. TAC.
told
/
202'
/$Y
~
~
'k dor 702 3/6 264
/. 50
/. 7/
Har 903 346 297
/.72
/ 93 nor
/&o2
%Q 30I t.16
/. 9 9 er
/605 380 BS9
/. 8 8 2.20 Avr. Z5.ios dos /wm = (t.w/72M71*/.6!+/7l+/ 9.h A 95t?.2tyd A64
- 1 stb, p(Vtfi'10N s v" s f( Yl *I) ' s 0,jg c
Remion l
Pm 8/
Prepared By/Date M/ M.2/ 7) g Checked By/Date l
~
Son Joes. Cellfomia
- Project, Fde No.
Owner Client AVf. CCWSICUTId VWf 74T02 + 1 sio preg /cv < /.f41d,/dr 2 02 CONS (Culld //Vt/f 74 Tot : if Cf (6f Id(702 * /.74)
.9. P2Aur /A'tM /~Ac70C sce tytevitCfito e /.0/
A'2 6
.fttocutTS 762 14d(Afr* tw 76 D/rfitN'Cf /H Tf57 Pdf2SvCf (9/5) 70 vfwr Sti /0!4'T (/062) 4A'O pectEAsf /A' 40Ab tuf 70 AP
- 4. $uk1M421 Cf /WutT//t1647 MULT/AlfR
/ VSP 6f 8 val d CASC
/. 84
/.29 8
mi pcP 2,02
/.74 PLANT UU/Q uf
/. 0 /
/ 0/
g 5.
204DS J S W (CLD C.5 COL : 20 2 *
(7EST/ PA6{ 42 23
.Z$ CCL r /54 "
of M&ns 2fMr) e QS COL! 202 /.84)(2.0 (/o0/)
758 (iii wm ;!)')
ZS coli /54((/.94)(2.02 (/ 0/): 5 78 ',
$ SEV hb7 bEA0 toA0 '
15 lbL z /64 d5 cc4 2 /92<
$E/S/4/6
- J $ Co l. * /5*
QS fot*
2 /E AT MAX SWl'EN!AW. A/JtlM k(PCE7 //if.J/,'b8 P6 /3 Tory Lc4o:
(6 SW 107)
IS COL:
/64 + /54 578
- 75 7 '
C 05 cot t
/924 2/* 758' 97/
i Revision Pm M Prepared By/Date h///A2[r7) of O
f Checked By/Date
. _ _ _ _ -. ~ - _ _. _ _. _. _ _ _ _ _ _ _ _ _, _. _ _ _ _ _ _ _
San Jose, California Project 8N file No.
M8 Owner _
client
- 5#
- 6. $7EEN6?H h4fl0S (6VAtvrMoiPOP) i W
u t T/ M M lW<YiM M7/6 gayg>yggy in,4p AuCw&Bir dAPM/rY cour tit ri.w it 2 $du da.
711' 940 '
28 W 6.2I
/rfEl T3 C S E IS Cowvy 751'
//Z? '
3 !~':) '
o, yi
/di m cut:
IS ?>r
') 5 7 '
993' G.G '
O. n Wu n.yc 0S 5.tx fca 9 7,' "'
9do
Cs.'a *
- j. 0 3 C.?4 C S t b w e.2 9 7l '
//6 9 '
3288' O,82 MiiG cc:i e c pn.
n.'
%3 '
2-)w o.9 a
. a c.:,..: -
fu. cow 1parwis 41E67 dCCE &^4 0 Vfuf,.?rp e1c7u m ai ZXC697 702 CE Sb'ER.
Co.<%,' kWMU a's 3 tj dru'.
- 75 ult /Pfil' ST2i Y4w 4'A7/o = 0,?'t < C,5 B. iaeus GNta. Greesst.s
~
/ fg7dC 172 STEFLAT Bo?7aN di MC5 7U:
Pa6mM 7EGff/b27 7T-2482 RATIO $ 61265S 4 45" 70 BoritM 9/8 ob45* Pi7 Qn ~vM d %f 2/8 645f ?)2 R4rio TC$7 2ftDRT bGC5 V07 colin 2m EdRtIG2 1757 /
3288 Psi 4893 PJi
/,49 PRESGtJ7fnoa //fcE3 TfS*' #2 23/8 /so 32 34 f5'
/.40
- JSED By fig L/.5f WQESt~ Cy /401DC r /,ff (6f r4cw M)$)
l l
1 f
Revision __
p g
Prepared By/Date
%///0'N77 g
4
~
. Checked By/Date
MN sen Jose, ceufemte Project
$NV hie No.
I owner NSA client __#de
- f. fM ice i?R Mut.7/th( VQVE ffffc7 ntfE&i APPCN0!C C pixx4t6r of MonT. TEti REPCRT i
TEST BAY ST2fM($6/6) 1 O
- y. 400 bi
$2S$ er 60fr[S 9 3.Q~rQ.EI5 ]
~
2 C
- 3. 9 72 3
9 6 746 (Imw) Sass ! ?.23 rs 4
4
/, '7/od' S
C 0.2/5 SyAWrIlsr S.ltE,sb F*
/.679 a'//
4,2 52 ts o
)
og 4 6
/.768 a/5 5,2/8 n, f aw4
//
/ 74 8
- sess Soukas 7nr 2(ZUlr5 flut? 4A4'f /7 /jME4tS TH47 STdf3.5 K A%P/ 4 fuNmot' of
$72W70f%
%f5MNSF 7NAH 2040, CCHS6fr47/pf,4SJutAPW WevtD Bf 70 US6" SESS of EfB/DNMS.
SESS r[bW* 3.W*,?I6 r/.Yi$r.27$1 A579 + /.%$M59f r 4,p1
~
f4070e r 6.34/3.4r A 8(o (df74crae: Ab 7)
J.
6N.sauri r %we ActuAriou est P m r.crtrss resta
/ Tf373
( 7s2,'70? /602,/603) l str 56/8 (r 9. 847ksi (4mun d or n. ember Tf57 /bO3) 1 E44Nr UsiGW (4gotz f4CT&t ' 40/
+YAINTS M2 okt. DW 70 71 57 P K f S3.
// 2 t9 f t'f 2/A T/M 44 0 dP
/
l S.
37AE55 DLf 70 //19A0 STAT /C LC10 i
/
NPTHcf HfTERr //,96 47 MAX SUBtW(R6fMG' nActus.- /Kp "
PG$$URf3,45(//.99)*5./$P$r TNicKNEss e, 564 PHli : 5./4(/tdo)l 584
)46 ) psi V:
t Revision Pm M f}&2$ ')7
~
Prepared Bf/Date )
Checked By/Date
.~ __
_. -. -. =.
1 nutech ten Jose, California N
File No, Project l
owner USP Client M
6, 8 VA W f 2No hop SMEtt. 5r2653 rAcree ice s7 ens ran sste ro aoricM
/.49 (6figw A08) tetJ7th'E VAwr fdC702 (&VAwls)
= /,8(o (6f T&76& A 67)
P/.447 OMiqur fy(7vg
- /,0 /
(6t" FAc70 Go - / 0/)
dCNSEcurtyr ActuAcricy S72535 9847 psi (6fs@tt) hJ' 'DPoSTA TIC NEAD STNSS
= /96/Ps/
(6f40usH))
3rer.ss 9 307= 9847(/. 49)(/,36)f/i0/,' V ko/s 2902o PS i J,rittw1r FiBf2 S74rSS nff/>tBffWf PMS BfNow6 doot /uow :
MEMB24Nf:/9 3*Si Mf/M 4 3e*4'D # /o S(/9,5) ~ N. 95 XSi STP utr tfi17!?!A :
25y n~ Su wncy evuz iEss 2S z 2 ( 5 61)
- 7 (a > 7 0
.'. 03r 70 y
SrirNc,rH Rf rt0 :
toof:
29/28,95 AC/
/ f o rte coor Al <,5 29/70 srP :
- kbesi C4Si SNfu $72Est 47 ho770M 6F 7MUS l
/.655 7 NAN /% QVER COW,
- t/irix4rr steennrH MArio <,f I
l M>TE: 77S7 CE2/ES /6 <6fD 7K SHER To Bo770M our CN TNF BfY E,42rNQudKf 7/f CAUSIN6 l
5/MITM4NTLY /MSN6/2 6472fME f?Bft? 572rSSES I4/ S//'EU-A7 6A6C /8 Revision p
g Prepared By/Date p /A2/p) g f
Checked By/Date
San Jose, Califomia Proiect..$$ll WO UATION File No, MM Owner M
Client
$_Tf7f dr STRESS m $Nftl 5 074E2 77/4' V 66/8 GE4y.5//EK 4NfS :
SG /d b 45* M/OSA Y S6 / Q @ WATER uyf M/CBA Y 56 /S 'S wyfe UNEM/DBAY
- f42 2/N6 6/P M 2
$6 22 a wArte uuf AT EQ 7/f 56 I7
- orof EQ Til
.56fi7 M M E Q Tir Rifffikff TABlf 4.2*3 Cf JYleuTI /f69027 6A6f RET 572f55 7CN PEAC ST2f55
/8 2.86 K51 f 44 (p,Qo g5o 1
betElusHEn
/9
/,64 3.39 5.5(s xs o t
/5 2,27 2,64 g, 3 9 45, 22 3.09
/,4 5 S, lo xsr
)
l Ar DISCUNr/NU"'i
/7 l,0$
2,05 g,50 psr 57 f.9 9
/,6 9
//. / 3 n,
247/0 DF S6 57/S6 /8 * // /3/6 9f * /,59
- /ECM 6f6f5 /9 AND /6, 77/f $0NC40S/0NJ B/)SfD oN S6 /6',42f l
l 4T/l.L Vfl./O ib2 TNf ClffN.5//fl( /)2//}$
l
- TECM 6/}6f$ 22, /7 dWQ $7, 77/f (CNClUS/ONS BA.9ED of 56 /8 tier
/)lSO Vflio FDP SNEtt.572Fs3 AT MA70/2 DIScQu~/Nur7/r5
-)
SUCN AS TNr EARTNGvfKf 7/l fNO T/Ir K/W6 6/20fe.
I f
$005 fM0h/f 3Lf 6XTREMF f/8E2 ST2FSS 702 A2fAS A7
\\
f)/SfCur/NUlr/f5 IS 3 G,,,
(THICf 7WF Cl6AN St/ ELL Allaus?ti of /,5 Sm).
Revision i
Pm M_
Prepared By/Date h /028 7)
Checked By/Date
Attachment "C" Page 1 of 3 1.
The Monticello Plant initially had four safety relief valves dis-charging to the torus and four conventional safety valves.
SRV discharge lines terminated in the suppression pool as vertical straight pipe near the torus wall with no discharge device.
2.
July 25,1971-Operating procedures were issued to require operator to take manual control of SRV following isolation and blow down to 950 psig, with pressure to be maintained between 1000 and 950 psig by manual blowdown as necessary.
3.
January,1972-SRV discharge lines were extended to torus center line and rams head discharge devices installed.
4 July 25,1972-Installed SRV discharge pressure switches with 5 psig setpoints and inputs to computer sequence of events monitor.
5.
April,1974-Replaced the four conventional safety valves with four SRV's.
SRV discharge line ad31tions installed with rams heads and pressure switch monitors.
6.
Jatuary 6,1977-Operating procedures revised to require operator to take manus 1 control of SRV following isolation and blowdown to 800 psig. Pressure to be maintained between 1000 and 800 psig by manual blowdown as necessary.
Specified sequence of blowdown so all SRV's would be actuated once before re-activating first SRV.
(Sequence of SRV lifts based on history cf SRV actuations, i.e.,
1st valve specified for torus bay previously experiencing fewest ac tua tions. )
7.
October 1977-Added 8-inch vacuum breakers to all SRV discharge lines.
Installed three prototype SRV discharge "T-Quenchers".
EVENT #1 Date: thy 20, 1971 Power Level:
75%
Initiating Event:
Startup test STP 11, Initiated by tripping ROIS relays with opening of test switch.
Sequence of Events:
1.
MSIV closure at 1318.
2.
Rx pressure peaks at 1069 psig, approximately six seconds af ter initiation.
3.
No automatic lift on initial pressure peak.
4.
"D" safety relief valve manually operated to reduce Rx pressure. Actual nmaber of manual lif ts cannot be determined but only one is suspected.
l l
Attachment "C" Page 2 of 3 EVENT #2 Date: May 24,1971 Power Levels 100%
Initiating Event:
Oscillations in the steam line flow signal had initiated the high steam flow isolation of Group I.
Sequence of Events:
1.
MSIV closure at 2146.
2.
Auto lif t of "D" safety relief valve (1085 Rx pressure peak) 3.
Rx pressure reduced to 976 psig.
4.
Manual lif t of "D" safety relief valve at 1035 psig approximately 4 minutes after initial lift.
5.
Rx pressure reduced to 995 psig.
6.
MSIV's opened.
EVENT #3 Date:
July 14, 1971 Power Level:
91%
Initiating Event:
Pressure transmitter was valved in service following routine calibration, a pressure surge occurred in the instrument sensing line.
The surge tripped the main steam line high flow switches connected to the same line causing a group I isolation.
Sequence of Events:
1.
MSIV closure at 1348.
2 SRV opens Rx press 1060 psig peak.
3.
Rx press drops to 995 psig.
4.
SRV opens Rx press 1090 psig peak, 1352*.
5.
Rx press drops to 1025.
6.
SRV opens Rx press 1095 psig peak, 1353*,
7.
Rx press drops to 1015.
8.
SRV opens Rx press 1095 psig peak, 1355*.
9.
Rx press drops to 1040 psig.
10.
SRV opens Rx press 1090 psig peak, 1357*.
11.
Rx press drops to 1035 psig.
12.
SRV opens Rx press 1090 psig peak,.%s1358*,
13.
Rx press drops to 1030 psig.
14.
SRV opens Rx press peak 1090 ps.g,ms1359*.
15.
Rx press drops to 1030 psig.
16.
SRV opens Rx press peak 1092 psig,es1401*.
17.
Rx press drops to 1025 psig.
18.
SRV opens Rx press peak 1095 psig,.g/1402*.
19.
Rx press drops to 1018 psig.
- Estbnates made from measuring Rx press chart.
l NOTE:
It appears that the Icast the "A", "B" and "C" l
valves lifted during this event based on discharge pipe tem;.erature recorder indications. We cannot l
tell which one lif ted at a given time from the t
available information.
l
Attachment "C" Page 3 of 3 EVENT #4 Date: Novanber 6,1973 Power Level: 99.5%
Initiating Event:
Inadvertant trip of a main steam line high flow sensor during routine instrument surveillance resulted in a Group 1 isolation.
Sequence of Events:
1.
HSIV closure at 1338:47.62.
2.
Rx pressure peaks at 1065.
3.
"C" safety relief valve auto opens at 1338:51.82.
4.
"C" SRV closes at 1339:11.03 at Rx press, of 970.
5.
"D" SRV manually opened at 1341:08.47, Rx press 1035.
6.
"D" SRV closed at 1341:20.46 Rx press 975.
7.
"D" SRV manually opened at 1341:43.&4, Rx pressaJ1024.
8.
"D" SRV closed at 1341:56.16 Rx pressnJ970.
9.
"D" SRV manually opened at 1342:20.48 Rx pressnJ1024.
10.
"D" SRV closed at 1342:33.73, Rx pressr%#966.
11.
"D" SRV manually opened at 1343:13.41, Rx pressrV1024.
12.
"D" SRV closed at 1343:25.75, Rx presse%#966.
13.
"D" SRV manually opened at 1344:24.10, Rx presseJ1028.
14.
"D" SRV closed at 1344.37.70, Rx pressv%#964.
15.
"D" SRV manually opened at 1345:38.69, Rx pressed 1028.
16.
"D" SRV closed at 1345:51.52, Rx p re s s es> 965.
17.
"D" SRV manually opened at 1347:10.93, Rx pressrJ1043.
18.
"D" SRV closed at 1347:27.54, Rx press #%J910.
NOTE: These lift times are accurate tLmes as indicated by the sequence of events recorder.
San Joes, Califomla Project Ob__ IO 90M file No.
027)/ffN__S]_{T]$ hQh ff i
Ownsr-CIsent A'$EEEEEk' _$Zd70 hdMl!?
SUMMARY
neroe c,c (sur. A )
mp (sect. a)
SWELL SielSS S$ /d 70 Bot
/. 08
/,49
$Hitt $7555 8 QLvl Muti
/, 43 7
/. 8(o
$4CLt. !?243S 2ND /d?
- 9. 847 K5l 9.6 47 rsi dos. LoAO 8 v4W Mutt
/.29
/84
@L. tC4 O frio SUP
/,74 2.02 P %7 VNtyJr (Ac702
/.O /
/,0 /
S/ ELL STelSS /sce. DOC 70 bl4bLt40 NO FES SNE2L STRE9S 2 To20S bot
/77(oCPSI EMC PSt hffX/ MUM.STEfr%TH P)rto C, '2 %
6,34 FoR SUPPORT sTRVciJEF
- TORUS SUP/U2T : WirH MP Moef cDMSEEVAr/Vf AtsuMPT/CN5 4t4
$Uffb?T COMP 0/Ef75 WITH/N l'aM lllloh! EXCEPT 0.S. tbloMN 70 SHELL. coNNfcr?oN wNicN /3 3y ci(A? CODC, GTP ULTIM4rf STl'EN6TH Mf 7/0 = 0 34 < 0 53
- /Ceub $df2L : WiTH NSP MCRE ccNSENATIVf ASbuMP7/0WS $NELL $72i55
~
Ar Bo776M CF 7D205 (Er72EMi F/ bee terMaeAvr PLUS BENDINfr) LE23 THAN /$f CVfR ccDr AttoN.
STP utr/ Marc.sr2EAHTH PAY /o ; O.4/ < 0 5 lN EVfluf 7/0N 6f SHELL S7tE55 AlffE' 2/M6 6/CD(P IMO EARTHQuyf T/E SHoh) TH47 coyausions
/PEACHfD /b2 56 /8 ARs L:eM5Ett/ArtVF
- HCEPTt;WCE $2tTEEIA C o x A u +o w.
S 3thi S;7ahi 5, /9 3hi satit S SKo 6r 70 f
primary thEMBefNT4 79//WilRY BENDIMS r /5Sm (2d. % hi)
$If UL7/Inf7f :
SR < 0 5 ult kt SHEtt
- Su ('la.v:,8 )
Revision p
j -
Prepared By/Date A/j]
Checked By/Date
DISTRIBUTION AFTER ISSUAN' 3F OPERATING LICENSE W 1 NUCJ A A CloVLATCr v ceu,4sicN oc tNuwesaj l
QRt*, poau 195 O N EP 1
3 Mi
\\
NRC OISTRIBUTION son PART 50 COCKET NATERIALCart ce coc waNT t
FRCM:
'o.
Mr. Victor Stello NSP 10/31/77 l
Minneapolis, Minnesota 55401
,,y,,
3,,f 0$f7,7 l
11 L. O. Mayer NguSEM CP CC#IES *ECElvic N CTO ml23 D
- 8CP t NPVT # C *u Men 3 si 3,4e o 3 %-
oR644NAL NC LAS$l p t 8 O C= v ENeLosu as Consists o' inf ormation concerning
~ 4eniptics Docurnentatt on of liasis f or Continued Operation
~
Swquential SRV Acutations of Isolation Events...
Notori ze d 10/31/77......
3p 16p PI. ANT 'IMtE:
MONTICELLO
,' jcm 11/03/77 Vo CYs 6we L.
R ec 'd I
FOR AqQN/INFORMATICN c AFT "Y i Q,RANCM CMICFt (7) lM AOi$
l l i
1 I
4 4
l
~
i i
l t
i i
I 4
I I
i l
i i INTERNAL O'STRIBUTICN f
T A rG FILE
_J I i i i I i i
o 4 7
..-..s j I i i i i l
i I C E (2)
I i i I i i i
I i i I
I i 6 OELD i 1 I I RA!!ACER I i t i i i i
i e i
! 6 CHECK i im I l 4 I
)
6 i i I i 4EISENMUT t i 4 4 1
) iSHA3 1 1 i i t i i i I iBAER l t l !
l i SUTLER I l l l JRL4ES I
i l I t i t i i i J. c0LD5 I i i i i i a Me G eocu I
i l i
__ I I
1 i
! I t i I l I I I i i t 1 i i l I I i l i l i i
\\ t I
i i l i i i 1 I
I I 6 i
pCNERCL NUM 3ER i
EXTli!RN AL DISTRIBU'nCN
/
I i'E P: Th i AJ Alt *A Ni i fM Af s I
i I i Tic I
t
i i l
i vsic i i t i j
i 16 CYS ACRS SENT CA*ELORY M
i i
/
773080105 i i i
i i
+ i i i t----_____________
_