ML20081K943
| ML20081K943 | |
| Person / Time | |
|---|---|
| Site: | San Onofre  |
| Issue date: | 03/28/1995 |
| From: | Marsh W SOUTHERN CALIFORNIA EDISON CO. |
| To: | NRC OFFICE OF INFORMATION RESOURCES MANAGEMENT (IRM) |
| References | |
| NUDOCS 9503290350 | |
| Download: ML20081K943 (40) | |
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Southem Califomia Edison Company 23 PARKER STREET IRVINE, CALIFOHNIA 92710 WAMER C MARSH -
March 28, 1995 m_
MM6AGEM OF NUCLE AM A,GULATORY AFFArne (714)454-4403 U. S. Nuclear Regulatory Commission Attention: Document Control Desk Washington, D.C.
20555 Gentlhaen:
Subject:
Docket Nos. 50-361 and 50-362 Withdrawal of Amendment Application Nos. 142 and 126 San Onofre Nuclear Generating Station Units 2 and 3
Reference:
Letter Dated July 7,1994, From R. M. Rosenblum (Edison) to the Document Control Desk;
Subject:
Docket Nos. 50-361 and 50-362, Amendment Application Nos. 142 and 126, Proposed Revision to the Updated Final Safety Analysis (UFSAR) Section 7.6.1.1.2, " Shutdown Cooling System Interlocks Design Basis Information," San Onofre Nuclear Generating Station, Units 2 and 3 This letter withdraws Amendment Application Numbers 142 and 126 to Facility Operating Licenses NPF-10 and NPF-15, respectively, for the San Onofre Nuclear Generating Station Units 2 and 3, Reference 1.
These amendment applications consist of Proposed Change Number - 437 (PCN-437) and are a request to revise Updated Final Safety Analysis (UFSAR) Section 7.6.1.1.2 " Shutdown Cooling System Interlocks Design Basis Information" for San Onofre Units 2 and 3.
Southern California Edison (Edison) committed, in FSAR Q&R 032.23 in 1980, to meet the Shutdown Cooling System (SDCS) Open Permissive Interlock (OPI) requirements by using diverse process pressure sensors: two Foxboro transmit-ters (force-balance bellows capsule design) and two Rosemount transmitters (oil-filled capacitance cell design). NRC acceptance of the SDCS-0PI design is documented in the Safety Evaluation Report Section 7.6.1 (NUREG-0712).
In a phone conference held on January 11, 1995, Edison informed the NRC that one valve in each SDCS flowpath has power removed whenever primary plant pressure is greater than the SDCS design pressure. These valves, HV-9337 and HV-9377, have power removed to prevent inadvertent opening due to damage to motor operated valve power or control circuits which could defeat the keylock feature as well as other safety interlocks. Based on this conversation with the NRC Project Manager and members of the Instrumentation and Controls Branch, it was agreed that having power removed from one valve in each SDCS flowpath meets the NRC's diversity criteria.
Based on this agreement, Edison has performed a 10 CFR 50.59 safety evaluation for this design change.
This safety evaluation supports replacing the four low-range pressurizer pressure transmitters with an improved model supplied by j
h 9503290350 950328 PDR ADOCK 05000361 P
V.
l f[5 Document Control Desk ;
one manufacturer and providing a diverse means of assuring SDCS isolation by
- 1) automatic pressure interlocks, 2) the removal of motive power from HV-9337 and HV-9377 when reactor coolant system pressure is greater than SDCS design pressure, and 3) administrative controls. A copy of this safety evaluation is enclosed for your information.
Therefore, Edison withdraws Amendment Application Numbers 142 and 126 to Facility Operating Licenses NPF-10 and NPF-15, respectively, for San Onofre Units 2 and 3.
If you need additional information on this issue, please let me know.
Sincerely, Enclosure cc:
L. J. Callan, Regional Administrator, NRC Region IV A. B. Beach, Director, Division of Reactor Projects, Region IV K. E. Perkins, Jr., Director, Walnut Creek Field Office, NRC Region IV J. A. Sloan, NRC Senior Resident Inspector, San Onofre Units 2 & 3 H. B. Fields, NRC Project Manager, San Onofre Units 2 and 3 H. Kocol, California Department of Health Services
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ENCLOSURE 10 CFR 50.59 SAFETY EVALUATION PAGES 60 THROUGH 96 0F AFFECTED SECTION CHANGE #1 REVISION 0 DESIGN CHANGE PACKAGE 2 & 3-2005.00SJ REVISION 0 1
e, AFFECTED SECTION CHANGE #1 Rev.O Page (O DCP 2&3-2005.00SJ Rev.O l
SECTION 2
2 10CFR50.59 SAFETY EVALUATION l
l l
AFFECTED SECTION-CHANGE #1 Rev.0 Page 6f DCP 2&3-2005.OOSJ Rev.O SECTION 2.0 10CFR50.59 SAFETY EVALUATION f
BASIS FOR SAFETY EVALUATION :
Total loop uncertainty (TLU) calculations that have been completed for the post accident monitoring instrumentation demonstrate reasonable uncertainties under normal operating conditions. However under'the harsh environmental conditions following an accident these loops exhibit excessive uncertainties. Also the saturation margin calculators in QSPDS computers use the wide range pressurizer pressure as the reference RCS pressure over the whole range of RCS pressures. The effect of the uncertainties of the wide range is significantly higher when the RCS pressure is reduced to less than 720 psia for both normal and harsh environmental conditions. The high TLU affects the performance of these accident monitoring instruments in post accident environments. These instruments are credited for diagnosing the plant status and confirming responses to mitigative actions. The following modifications are proposed under 1
this design change package :
A. Replace the existing wide range pressurizer transmitters with new Rosemount pressure transmitters model no.
1154SH9 RAN0'O'if.
lASC,I B. Replace existing low range pressurizer _ pressure transmitters with new Rosemount model no 1154DH8RAN0094 transmitters. The lASC I existing installation has two Foxboro/WeId transmitters in Channels 1 & 3 and Rosemount model 1153GD9 transmitters in Channels 2 & 4.
C. Add' signal inputs from low range pressurizer pressure channels 1 & 2 to the QSPDS computers channels 1 & 2 respectively and to CFMS computer via existing fiber-optic data link. Modify the software in QSPDS and CFMC to accept the low l Ast* 1
+
range pressurizer pressure inputs for computation of saturation margin when the RCS pressure drops to low range _ pressure.
Modify QSPDS and CFMC display,pages SMM?ds16ulat3f5EE65HEllTis thWmofeis^chsfaEs316k?Eshg sipres sGEfisfibres sdse$inp6t s7 ss ~
Ref erence l RC'S ? pressdre ilh ? thefldw? EEhgehegidd O Dele tid % SMM 4
calculati6n?subfoutiheffrOmitheYCFMSiandiutiliSithe.kcAlcuisE6d pathfr6m[QSPDS{fMdispl(ayioniCFMS@ ages [DisplEp~disisiEy" ~~~
compensated pressurizer level on the Pressurizer page in CFMS.
D. Replace existing Foxboro/ Weed model N-E13DH pressurizer
y AFFECTED SECTION CHANGE #1 Rev.O Page 62-DCP 2&3-2OO5.00SJ Rev.O level transmitters 2 (3) LT0110-1 and 2 (3) LT0110-2, with new Rosemount 1154 Series H transmitters. There will be no changes to functional design and other interfaces.
E. Replace the existing Rosemount model 1153HD5, steam generators wide range level transmitters 2 (3) LT1115-1,
-2, and 2 (3 ) LT1125-1 and
-2, with new Rosemount model 1154. Series H transmitters. There will be no. changes to the functional design and other interfaces.
.The 10CFR50.59 Safety Evaluation will be addressed for each of the proposed modifications separately.
2.A.
SAFETY EVALUATION FOR THE REPLACEMENT OF WIDE RANGE PRESSURIZER PRESSURE TRANSMITTERS A1.
Hav the proposed activity increase the probability of occurrence of an accident evaluated previously in the SAR?
RESPONSE
NO The proposed modification replaces existing Rosemount Model 1153GD9 pressurizer wide range (0-3000 psia) pressure transmitters with Rosemount model 1154 Series H transmitters.
Total Loop Uncertainty calculations for the existing Pressurizer Wide and Low Range Pressure Loops have revealed that under harsh environmental conditions following an accident, these loops will exhibit excessive uncertainties.
This degradation of the loop performance is attributed to harsh environments inside the containment where these transmitters are located.
Wide Range Pressurizer Pressure transmitters outputs (Ch. A &
B) are used as Reference RCS pressure for calculation of Subcooled Margin. Outputs are also used for Plant Protection System (Low Pressurizer Pressure Trip) and for the Post Accident Monitoring Indication (Reg. Guide 1.97).
The replacement transmitters are qualified to the same level (environmental and seismic) as the existing transmitters.
Location of the replacement transmitters will be the same as the existing transmitters. No loop functions will be modified.
j AFFECTED SECTION CHANGE #1 Rev.0 Page 63 DCP 2&3-2005.00SJ Rev.0 Loop functional test will be performed post installation to ensure safe operability.
The TLU calculations for the new transmitters have indicated that the total loop uncertainties have been significantly reduced for both norral and harsh environmental conditions. The new transmitters will reduce the saturation margin errors experienced with the subcooled margin monitors for both normal and post accident environs. The transmitter response time characteristics for the new transmitters are the same as the existing transmitters and will be verified by the refueling interval response time testing.
NPRDS search data (see Attachment A in Section 1)has indicated that the Rosemount 1154 Series H transmitters have one of the r
lowest failure rates in the industry and are highly reliable.
No other design functions are affected by the proposed design change. The wide range pressurizer pressure transmitters are not a precursor to any of the accidents previously evaluated in r
UFSAR Chapter 15.
Based on the above evaluation, this proposed change will not increase probability of occurrence of an accident previously evaluated in the UFSAR.
A2.
May the proposed activity increase the conseauences of an accident evaluated previously in the SAR?
RESPONSE
NO The new Rosemount transmitters have significantly better accuracies than the existing transmitters under both normal and post accident harsh environment.
The response time characteristics and the power requirements of the new transmitters are the same as the existing transmitters.
Therefore the proposed replacement of wide range pressurizer pressure transmitters will not adversely affect any protective actions or the post accident monitoring functions of these transmitters. The proposed replacement of wide range pressurizer pressure transmitters will not alter any assumptions made in evaluating the radiological consequences of any accident analyzed in the UFSAR Chapter 15. They do not affect any fission product barrier.
Therefore, the consequences of an accident evaluated previously in the UFSAR will not increase.
1 1
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AFFECTED SECTION CHANGE #1 Rev.O Page j(g._
DCP 2&3-2OO5.OOSJ Rev.O A3.
gav the proposed activity increase the probability of occurrence of a malfunction of eauipment important to safety evaluated previously in the SAR?
RESPONSE
NO The existing protective functions of the wide range pressurizer pressure transmitters will not be altered by the replacement transmitters. The new transmitters will have better accuracies i
under both normal and harsh environmental conditions. Existing train separation among channels will be maintained and the installation will meet the seismic requirements. EQDP's M-85107 and M-85108' document the environmental and seismic qualification of the proposed EGS quick disconnect connectors and the new transmitters for their intended application. The proposed design change has no impact on the loading of the safety related electrical batteries and diesel generators since there are no changes to the power requirements.
This modification will not reduce any equipment redundancy or independence of any system. No system or equipment protection feature will be modified. No equipment duty cycle will be increased beyond that assumed in the UFSAR accident evaluations.
No new type or more severe testing requirements are imposed, since the affected equipment testing requirements and frequency will not change. No other components important to safety, other than those described in item 1 are affected by the proposed change.
Therefore the proposed design change will not increase the probability of occurrence of a malfunction of any equipment important to safety previously evaluated in the UFSAR.
A4.
May the proposed activity increase the consequences of malfunction of equipment important to safety evaluated previously in the SAR?
RESPONSE: NO The proposed design change replaces existing wide range Pressurizer Pressure transmitters with more accurate and
AFFECTED SECTION CHANGE #1 Rev.0 Page 89 DCP 2&3-2005.00SJ Rev.0 reliable transmitters. There are no changes to loop functions and the existing interfaces are maintained.. Since no safety systems or accident monitoring systems are adversely impacted by this design change, there will be no increase in radiological consequences due to an equipment malfunction.
Therefore the proposed replacement of the wide range
' pressurizer pressure transmitters will not increase the consequences of malfunction of equipment important to safety evaluated previously in the UFSAR.
AS.
May the proposed activity create the possibility of an accident of a different type than any evaluated previously in the SAR?
RESPONSE: NO The plant function or design basis is not being changed as a result of this modification.
No new seismic or electrical interactions are created since applicable design criteria are met for this modification. Replacement of existing wide range pressurizer pressure transmitters with new more accurate transmitters will enhance the protective and monitoring functions performed by these transmitters under both normal and harsh environmental conditions. These transmitters are not a precursor to any of the accidents previously evaluated in the UFSAR.
Therefore, the proposed design change will not create the possibility of an accident of a different type than any previously evaluated in the UFSAR.
e-e e
o e
AFFECTED SECTION CHANGE #1 Rev.O Page JQ{
DCP 2&3-2005.OOSJ Rev.0 A6.
May the proposed activity create the possibility of a malfunction of eauipment important to safety of a different type than any evaluated previous 1v in the SAR?
RESPONSE
NO The plant function or design basis is not changed as a result of this modification. No new seismic or electrical interactions are created since applicable design criteria are met for this modification. The replacement of the wide range pressurizer pressure transmitters ensures that reliable RCS pressure indication is available over the whole wide range under both normal and harsh environments. The improved accuracies of the new transmitters will significantly reduce the margin losses in the subcooled margin monitors during normal and harsh environments thus enhancing the accident monitoring instrumentation required per Reg Guide 1.97. The existing electrical. separation will not be affected in any way by this modification. Therefore this modification has no impact on Appendix R analysis nor does it require any change to Appendix R compliance documents. The new wide range pressurizer pressure transmitters are environmentally and seismically qualified to the same requirements as the existing transmitters and are more accurate than the existing transmitters under both normal and harsh environmental conditions. No new failure modes are created by the replacement of these transmitters.
Therefore the proposed design change will not create the possibility of a malfunction of equipment of a different type than any previously evaluated in the UFSAR.
^
\\
AFFECTED SECTION CHANGE #1 Rev.0 Page Ji{
DCP 2&3-2005.00SJ Rev.0 s
A7.
Does the proposed activity reduce the margin of safety as defined in the basis for any technical specification?
RESPONSE
NO Technical specification 3/4.3.3.6 is applicable to QSPDS_.
subcooled margin monitors and pressurizer wide range pressure transmitters.
Technical specifications Section 3/4.3.1 which covers the RPS instrumentation is also applicable to the wide range pressurizer pressure transmitters. Technical specifications Section 3/4.3.3.5 for remote shutdown monitoring instrumentation also applies to the wide range pressurizer pressure transmitters Channels C & D. The functions of these transmitters and the bases of the Technical Specifications will not be altered by the proposed design change.
Technical Specifications Section 3/4.8.1, 3/4. 8.2 & 3/4. 8.3 cover the A.C.,
D.C.
& Onsite power distribution system.
Since the modification work involves replacement of existing transmitters with similar kind of transmitters, the loading on the 125VDC batteries and 120VAC UPS will not be impacted.
Consequently.there are no changes to the diesel generators loading profile.
Therefore, the margin of safety as defined in the basis for any Technical Specification will not be reduced.
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a AFFECTED SECTION CHANGE #1 Rev.O Page 66 DCP 2&3-2005.00SJ Rev.0 2.B REPLACEMENT OF LOW RANGE PRESSURIZER PRESSURE TRANSMITTERS BnSIS"'FOR S'AFETFEVALUsTION:
7 Th's7 SDCST at" both TSan ion 6f rel NO'clsAr[Generatfihy2S t!Atiion f(SONGS ) EUdif s 2fandb3?issisolated;f rok the JRCSibyj fodrfdormallplclosedisuctibd~~ '
isolation! valves.;iTheiSDCS.Cvalve3arrangementiis:Ishownhid?nttschisshd6 h OEschESDCSiisolstionCyalvesis.{poweredlfrom?sisepsrate?Clssst1E~
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room ; operation foff keylocksswitchesh ! Procedural?requirementsh(in[OI ^
SO23AS-l't3) Jincludef the iremovals off thelkeystwhehi theDvalves ~are" closEdiduring plantistartup.[ThdrefAreifourdindepeddSntishsnnelsT6f Clsss~1Eflow-rangef(ON750fpsia)/RCSfpressbretisensbrsito)phoside" pressure ? signals :: to; ths j Open i PermissiveMntier16cks k(OPI ' s)I '-
ass 6ciatsd'with theselvalves. RThsivalvesiare Larringsd(ihMio paralleli flow. paths;:0 each Lwith Etwo) series [isolst1~on valOes.~sEshh vslve Lhas ! ant OPIl f rom iits 5respec tives channel:fofta s lokArangel RCS "
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((chsnnsisOliand13)',JandhthefotheriwitRAiR6semountJ1153#transmittsi i( channels [2$and /4 )i/;Once s the[OPIh is i satis fidd/sndI the i SDCS / sudtilon palvesiare opened;falarmsiarespr6vidEdffEbushllSf6urfOhsnnelshtF' warn $operatorseshouldSRCSjpressursjincrsaseisbovsilimits? set? fos SDCSioperationi;>"
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s AllERCSIpressureftransmittersihre?i6datsd71nsidsTc6htisihmenth EClsss 4
1EJcontrolhroom;indicationiofHRCSipressdrefisiprovidediby?fodr
.S qualifiedFwide-range" channels 1(0-3.000fpsiaMRosem6dnt)/andifouf x
qualif ied? narrow'- range) chsnnels ? ( 1500 - 2500ips ial;[ Foxboro/ Weed)). f n5 indicatedrabove, t wide - range?Jchannels; 1': and ( 2 dalso 6 provide? inputs h: td thefQSPDS!for subcoole'd?marginLmonitoring~.1sTheifourfquslified" low rangeichannels'used1forttheiOPIsidoTnotLpfovidelcontrolif6crh a
ClassjlE[indicationbiNon-1E' class? low-[rdngs?indicsdiontfrom'
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channels ^1/andf211s provided.
- All? f our :ilow-range 7 psessures :Fsis
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c available ' via ! the 1 non-1E ' plant f computer. sThesvarious?RCSypiessure transmitters, their sangesk channel designations;Jand?their^
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principal:Lfunctionslare shown0in:AttachmentiCL(Seationf1),-
PressurizertPressure :Trsnsmitters:Arrangemdntd;)l Pressurizer 1Prsseurs Jndication-Data' is shown in
Attachment:
D :.(Sectionil)L.'
rell'sf? valse PSV-93'49 is'on'ths:SDCS sideEofithesisolatibn D
i SD'CSL valves :as: shown in: Attachment B7(Section 1). iInSaddition toLthe 4
OPI,TSDCSfoverpressure protectionfis also:provided bylrelisf?valv'.e PSVr9349'.x However,:the SDCS. relief l valve PSV-9349xwillinottbe
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aligned _to theLRCS;until thelpressure isibelow the.~ maximum #n'ormal
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I AFFECTED SECTION CHANGE #1 Rev.0 Page 6'l DCP 2&3-2005.00SJ Rev.O S DCS~op e ra ting lp re s sd r;5'l( 3761 psia )l. ::
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1 AFFECTED SECTION CHANGE #1 Rev.0 Page 70 DCP 2&3-2005.00SJ Rev.0 l
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c -
e;yFailure%ofialpowergsupp yjs any valveitoichangeipositiong 3 )? TheWalve s75hal:19iavsTindepshdeh t"diVstssTih E'sf166k5Et6Epf6tdEB pheJordbothTvalvesifromlbeingcopen3urihgJs.nhPCSfihbisaseisbhveE~~
3 design: pressu refo f h thek RHRi (SDCS )?.'
MMP"2&3-6772.1BN rem 6ved(thist autoTc10's;d(6,[rdsdi'i' ems'dtitbXispi'ois
?
reliabi;1lity[off theisystem.3
l e
AFFECTED SECTION CHANGE #1 Rev.O Page 7I DCP 2&3-2005.00SJ Rev.0 4)7Noisihgleffailbreire'sditsfin2oVefpressurizingLtheLShUtdowd Cool;ingL; System and;no sing 1eifailure;pfevents. low temperature i
ovetrpressure. protection of.: the J RCS.
5 )5 Ths ? RCS !;1o# t'emperatuie; ov6rprsssUre?protechion dish' hot?:de f ssE6d by(the) interlocks;;whichtisolateithe?SDCS from?RCS.
"^
f Thsipidp'6ssd Edesihn7chshysyimpscEMonlpfEhsWsqdiisssHEs?lhi2 )?idd 4)Aabove.;The;diversitylin;Jinterlocks";wa's/provided(inihaving ~ ~~
pressurelsensorsifrom:differentJvendorspfee'dinghthefinterlocksJ[TEs proposed design?chadgeiwhileimaintainingtindependenceloftthe interlocks'? eliminates thsidivsrsltyfpr6vi'dedlinjhsVingypressdrs sensorsefr'om different? vendors.:However#onetvalveTinieach: SDCS t
flowpathlis power? locked /out twheneverl tihelRCS; pressurefis? greatisE thanithe:SDCS' design ~prbssure.<TheVpowerlilockout provisionjcanjbs credited i f or : diversity l:; in$ valvef interl ocks t
'~
SONGS 22/3EPOWER LOCKOUT;MODIFICATIONST 5
7 TO MEET *GENERTC? LETTER 86fid
" IMPLEMENTATION OF' FIRE : PROTECTION-::REOUIREMENTS 9
Ih'a;c is tter f ros M: s ON Medf ordT(Edisoh)Moiths!DF ihehtiEC6ntioF Dssk O
m on ( AUgus t* 25," 1988),W Edi son;finf orniedsthe11NRCithat j e isCdamsgekto" ~ ~
,Q motory, operated 2 valve l: powe r J or? controlic'ircuit s :1 cc Wdefeati the keylockJ f eatureiasf wellf as.fotherfssf etysinterlocksIlandlispUriodsly opentthe SDCSfisolstion@aivesij:Ina'dvertent?'openingiof 3theseNalves d
mightfresult1inJa$1ossfofy coolant;sedident;( fin (orderLto@feb1ude" ~~
this, J powerjlockoutt has ? besn yimplementedWtithss:480Vfp6werfsodres for;HV-9337f and1HV-9377..; : Operator:; action;<istrequiredtout.sidef the controlLroom4(atithe[50!: elevationsinttheicontrol%dilding)?ito" res. tore. power toi these/;valvesspiiospto(initiationfof:jSDCS iflowi IBy atletter; dated October:27 M1989,JfromlLawrence?E. Kokajko)(NRC)sto "
Harold B.' Ray.(Edison)Fthe;NRCrissded)theTSafety/Eva10ationtReporb (SER):Leoncerning:open; fire:protectionjissues at SONGS? Units #2iandy
(TACf NOS U71043E AND L 71044 )'.-. iThis1SERfis / basedlinTpartiod"
' ^
information provided:byjEdis6nLinithis7 August /25,/1988 M leti'tsrb In summary,the SDCS is protectedTfrom"6verprsssurefbp}maltiple
~
Y means:
1.
Class:1E wideirangefprsssureTindicationTinTtheicontrol room.
2.
The isolation functionEisLdesigned suchTthst?'ndisingle active failure can-result'in overpressurizingjthe'SDCS; 3.
Diversity in valve intsrlocks.
n, n '
AFFECTED SECTION CHANGE #1 Rev.0 Page 72 DCP 2E3-2005.00SJ Rev.0'
[?
.a E.s._ nut,omati4.xs~,.. w.; 4,.w.#-..wi#v~,.%. lock *s~s.w..y.e w.>
. r.,E.wy..h. +mspreve.n nt e -..
r %.gf.<,r-w.o.-~.r.-,,
4 e-
- m c cpress. u. reg. neer
~~
i s. o l.~a t i,o n % mval-pres. s.u_re%issl_,v.e_ s_gfE6mib.inggope d._lun_ti.~l. RC._S.
e
-n e s_s E t h a n S D C S 5.d _e s _i. e m
.. gni pr.e._ssurea n
- -n i.ifj"g, yh.p.pp.e.frbfh.
A EP P'Ev n g",eo "i.V
, p' owe r# f _r' api..,.a,.pgs dp,0;.g.
% -/ g 3. ql,.. wpp.g ipAQ b_' dhP/
. %m. _ R e) m o"v'*#i*
"'8.
'gf*,
ve..'.##
"[a //,' %.-b 4e, gamo_
A l.no~w+g p~a..th_m"lF"*
- t'#.i.
9 1
de,. sign.7 r..~, h,~e. n~@+.g.a~.pr,u+_ssu_m_so,ne.va._
m r sis ~mtg t
- tha 2 m
kw CSh e
m,,e, maw.._rea.,._er,un_n a.
u n.9 essure.a.
e
. - - - - - ~
an. Admiw+i-4to ? b.,s t*ra.+t i. *,'fr'),.w-; > =
=y--
? ^*<-*,v-f,,ireAt. +6s.,ihg%.ithan.contr,olsEre.quiw*>i-
- SDCSsde. ign; pres
'z RCS,k.prf=&on>45,,;W==M=M I,
&m, x,M-?, =Mv=rW-r ' M */ s,ng -
essu.re w-WW 4.rqqrk,vy,,
n-NM^
-V.n. veK cm n
v oser2aiidEope,,,n,i.n,w...v t,hs$S.DCSk.pri,r,s,to;ca/C swus,,,y esl ~essw s
surep o
i gE,+ ewswww.
idbfa#v.m w.s+ww;/,w;u,:,a y,,..
s
.;ce
.m val;ves
,.,w..
1sswanrwe,nsses chw.: ww.an e.vsny,y v.y w,w,vi4e. ; ares rov de.~d..yfw=ww.v hm-a orat.e SDCSmiwe,wlm+v va.lves 4-n. h,e.i khy. s,i+s.+,. p~ -~d idurin,gi_ norm.a 7.a.~ wti,t...i,.w.-enso a on,;
i,,-.,
v mnyq.y ls k>.y swi,t.,,m-oc K
4n.An w.
x-~-
s
~
=
~ ~~.
pera o.n.i RPr o_r T
n
~ t.
tr 1.,em,. o.,v.e.,..
o
. to, _f e,n.t.ry#m.. n. t. o gSDCS1, pow.e_r.t. s.N r_e._s tored.7t.s,.s: t_hs.s_va,l.wvest,att,er ensuri_~gsthats,the1..RC,S? pres..s_ uresis,el_es. o
~
43 m
s m
.s8t_ hang ithetSDCSaval_ve%ali. Eh,n_i;,SDCS_m
. n.
ignypr~e~ssu.
nment%1~s.
-~.
reyandethen.
des
- n. _cuted.n _6 L lseddenesusing#theM~ey~T~~~~*'g"~~~~^"
sks
.9
^;Wwen : -ir
- v. e qw+ vcpf.ve wr+
i Ala.-=;w,Wu Nspee.=-ow.g.p*s.m--weicd' e.od-. y+t of al<.c4wertro ors 3t at 9;.v+ *, e;.wme.r.v vo:
m_ayfssd_5s_d ESDCS._ide_E_QH_fp_re's_s nr_pe ra t<%,.v;.m.qfee h rmsvareiprov 7
Ng
-.~
m, u
U{@_Rul.m_fWs1._FsEPS_VF5_3&S y%
fs _
mm X. sEiiFfs.._ss_Yf7. 6EEH5N_f6^ ji6,5~sd._Edsd.i.~g5.m.hs._his_NUPSART, Ss_6EI6 nW _~
m
.iW@
Tc
^
r9Shutdowninccoli.m mng S.y;s. tem.,% Int.erlocks s_Desiga. Bas._t_s#.In_for~m, at_.
tw l_y
~.
+.n revinc
- se, foll wing.Sectiont-wit,addsth o
3 y
w>&
newk,% mas.
.w.L....um.sws+1+.msuk M+
All ths"sensoEs1f6Ft!hs~ShdtEd6ss'C6olihg^Nalis~b~psnTpefmissi'fsl interlocks may be 'of 'Lhe same design and/or manuf acturer. )" ~~"
Diverse means of assuring' isolation of the auction side of"th'e' SDCS,is: provided by 1) ' automatic, pressure : interlocks, 2)'^"'^'
~ '
kemoving motive,powe'r _ from one valve > in' eachiflow path whhh keactor, coolant' system pressure is greater'than SDCS design ~
pressure, and ^3) administrative controls.. To enable operatibbs j
to determine the appropriate shutdown cooling entry ' condition / "
Class.1B low-range pressurizer pressure. i.nd,i,c,atio.n is provided i
~
.~
i
-in.- _the._ contr,ol._ room. at the QSPDS -
'I
~
AFFECTED SECTION CHANGE #1 Rev.O Page 78 DCP 2&3-2005.00SJ Rev.O SAFETY EVALUATION B1.
May the proposed activity increase the probability of occurrence of an accident evaluated previous 1v in the SAR?
RESPONSE
{NO; M #
The proposed modification replaces existing Rosemount Model 1153GD9 transmitters in Channels 2 & 4 and Foxboro/ Weed Model N-E11GM pressurizer low range pressure transmitters in Channels 1 & 3 with new Rosemount Model 1154 Series H transmitters.
Based on the vendor equipment qualification report and performance specifications the new transmitters are environmentally and seismically qualified to the same requirements as the existing transmitters. These transmitters will be installed at the same locations as the existing transmitters and the installation will meet the same standards as the existing transmitters.
The loop functions are not changed except for the addition of inputs from low range pressure channels 1 and 2 to QSPDS dFMSTwil,A, and B_ respect.ively.TThs!;is6difiydyibhME6]QsPDS{Hdy channels l*nothhavepanyfi.mpactionitheef6nctionalEdesignEsince thei niodificatloni psr f onns 2 the?sames fdnotfiOn3 ds Mhsidri des igniexc'ept?? f ori the ladditionalidisplays of @l6wlsshpey$1ndli" pressdiss
'Ad( QSPDSJchahnsis / AW;;Bt ahd ? thsi improved?dschfaep6 ff subd6cled"
~
margin 1 monitors. 3Ths::!diYsrsityiOf 6idteribcksCaskorip(ids 11y" ~
intended s withi thejd1vsrsininat edibys the{:f proposed (bp3t
^11,.
~
eltisnsinitters propi.ysd dif fersntWendors ils/ eli idesignr:fHow, eve _r; thesinitiati6nfofRaccidehtsythatsarel:evalsatedyinithejUFSARiis~
notVaffectedWyitheifundtionfof?the*OPI[interlocksWOperation"
~
of fthetintsrlocksiandEsssociated[SDCf suctiodsisolstilonsVd1Ved ASC l isfrequired fordmitigaping3thlsicenssgpences26f @hsischidsnts2 3
Th61 f6wMres sdfs[SEf5EiiIhisdEibsTSpsEbniils Tn6EIIssedsdQ6MiEs emergency? Leo refcoolingif unctioniddring} shut'dowhIcdoling s f Af Los5 of3 Coolant?Accidenti(LOCA)LduringishutdownMoolingjislnot
~
considered (atcredible'6cesrience7sinceftheltstalistressfid?hh.
i RCSTcomponenttwilltbefconsiderablpithanfthsitotslistfessfatI"y' design l pressure g: Alsoi since$th'ei RCSit_empsratureif pressdr[ehAdd coret. decay)h.eatsare; greatly lreducediatlthis)timeRfthe
, consequences Tofl as breakh in ths j RCS?i's imit ighted B and icoF6 coolingirequirementsfare11essensdLLTherefore?a7LOCAfddrin)
i e
AFFECTED SECTION CHANGE #1 Rev.0 Page 74 DCP 2&3-2005.00SJ Rev.0 bh6(dosH [coolingjlis in6tCa Tdssiddj;l basis? esestQ ATEsVi~ew?6f ?;chaptisrl151of LUFSARihas?honfismedithstiMhs?pr6p6ssd designi changesido L nothadvers ely? impact 7 anyh accidsnti sdensrid"
^
@eviously} evaluated:Jinithe"UFSARE~
~
~^" " ' ' "
' '~ ~
A SO 'l BAsedl[6HithsTaboVeEsvalUaEiodRtheypf6p6ssdidssi$n@dhsEge]Will' noFincreaseithefprobabilityfoffochuiresceCoffah7dhcidsntI p;repiously f svalus tedT:linithe (UFSAR 2
~
' ~
B2.
May the proposed activity increase the consequences of an accident evaluated previously in the SAR?
RESPONSE:[NO;;
Ths':~dssigsfhndti6hiof Cths;; shst dosnTc661ing?systismiaddIhhs assiinl functions of ? ths L pEessarsisehsdrs ; ands thefLhss6cisted lnterlocksIare?h6til:.being/chsng'e'd. AThejrepladementifofflowysngj pressurizer pressure > transmitters (wilMaignificant1ly? improve thellooplac curaciest o f Ythe E c ont roll:boird 0 indica t ors S;In :]additil6H thefOPI intierlocks andithelindicatiods}st?tihefPMSicomputerO Cldss?1Eflow;rangefindicatiohiislinadel:/aVsilable%RQSPDS* ~ ~
' ~
- ChunnsisTAfMBATheTprop6sedt;designN111talsoihblp;;$redscsihHs saturati on 'i margin fl os si expsrienc ed ?Nithl theT computht ionj:Lo f' ^ ~
sa tura t i'on imarg iniu singi th.e!:; wideirsngeTpre s sdrizsp[pfe ssurs inputsist7 low} range {RCS'pressdres'$The(proposedfdesignychahgs willsnot:? increas e v the i con's equsnces Jof 1 anl:Facdidsht ibp? sdiefsely af fecting?the)'abilitys t o tinitiatet shdtido.UnTcbolihg?.whihhilstan operatortactionfbasedion(thekavailablefindicstionn Thelpi6p6 sed design; change:1will?providelmorefaccurahe(16w/ range)psessurizes" ASC I pressure 1 indication duringJahlaccidentnsndLwill:?elimissteiany" potential ( f or ~overpressurizing; thetshstdounicoolings pipidg'^ " "
systemtadd?also1makesLavailableflowJrsngsfprsssurefindicatI6H atiQSPDS L when2 thefcontrol? board -'indicatithFiWlostidueIto: Floss ofinon lE. TUPS power.3::Fori thesef reasons) tihe /cah(bility (for^
a enteringishutdown?coolingiwithinitheTpost-accidentitime'
. constraints Jwill tbel enhanced.w Failure.: of t any singlettranshlitihsf will:; noti: adversely L impacts the.D af fected ~ system;lfrom fpsrforming~
it'sfintended? function.asLdescribedEin?UFSAR7SectionsV7;5i3?3 andl7;6.111.
NoiUFSARiaccidest"evalsatios assurnpti6hs"areiaffectisdisindsFtihs loop; functions'and design basis"are not' changed;5TheYproposed designichanges ;do not change,yaddfor.ldeletef anyf function;thati
- I S
AFFECTED SECTION CHANGE #1 Rev.0 Page 79 DCP 2&3-2005.00SJ Rev.O initiisEss f ridiolbgich176bhseqdsiiEssh IBPKshhsndihy?Ehe"fissRnsAbt preventingioverpressurizationljthpf desLigd@hangehi1Riinprovej~'
the?capabilitylof:fmaintaining theffintegrityfofMthesRCSlandsthe SDCSipressure!bouhdariesMnhid}hEafshbsrriersstsfthsfrsissseV6f
- g
'fis s ion) pgoduftsin ~ ~ ~ ~ "^" """^"~~~~ "~~~"""~ "~*"'~'
Therefore, the consequences of an accident evaluated previously in the UFSAR WillMot increase.
B3.
May the proposed activity increase the probability of occurrence of a malfunction of equipment important to safety evaluated previous 1v in the SAR?
RESPONSE: fNO2 h
- bs The proposed design change replaces existing two Foxboro N-E11GM and two Rosemount 1153GD9 low range pressurizer transmitters with Rosemount Model 1154 Series H transmitters.
Based on the vendor qualification report and performance specifications the new transmitters demonstrate improved accuracy and reliability under normal and post accident harsh environmental conditions. The design change maintains the existing separation criteria and the appropriate isolation between safety related and non-safety related equipment. The installation will meet the seismic criteria of the existing transmitters. The proposed design change does not alter A sc.A l existing design basis protective action performed by the existing transmitters. The replacement transmitters are more accurate and reliable than the existing transmitters u der both normal and post accident harsh environments.
Thej~pfdp6ssd[rsplhEsise6EI6f f Ehsf15MEsHisWfs5AEE1Es%57ssinEs!
transmitt e rs h willinotSimposeTany![Edditionalgloadssonhthe1~Cla s s 1Es120VAC1 Vital 4BusisystemsywillinotI{ alt'sMthesexisting'^
~~
channel? redundancyfordindependsncsjdf@ tihei prss s tif6jl66psK Nd systemforiequipmentidesi'gnifsaturesisim6difisd!SNoYsquipment dutylciclsfisiindrsssedibsyond[thaWussume'dilhIENshUF_SAR" ~"
accidentievaluations. r No diewiorimoi-sTssveis96estfing' ~~
' equirementsYare71mpossdh{sindetthsisffestied[hangQ(Noiothe_r_
r i'nsbruhEnEs.
t e s tingi requirements [and] f requ ency[Willf h_o_t{y byf the se[ changes y c
componentagimportantitopsafetyyareiaffect,ed Thsrdf ordi tihe~pW6pos edidssigdEbhshyeIwill? notilhaissisitshd probabilityjof1occurrenceyof(a(inalfunctionL of f any{ep$pmend i
l
2, AFFECTED SECTION CHANGE #1 Rev.O Page 75 DCP 2&3-2005.00SJ Rev.0
'iniportant3to" sbfetpj previous {yJevalnatsdlin1thslOFSARy B4.
May the proposed activity increase the consequences of malfunction of equipment important to safety evaluated previous 1v in the SAR?
RESPONSE:ENO!
ThdTpr6 posed &repldcementlof} Low? Ranse {PrbsL5driiefr? Pries 5Hfd.
l(ORPP )i trans'mitte rs :( willj providetmorelaccu rate? andM reliabl' e
fopen"l permissive;interlocksiforftheishutdowhScoolingysuctidh valves.
Additi6niof?LRPPTalong(with?mdfefdbcdratbTWPyPytolthe];QSPDS marginiandLalso provide;tmoref reliable? Cla.ing4thej; saturation wile reduce!the1marginjofferrorlinicomput 1
pressure? indication?in:controlproom MOperatingjiprocedures(RCS, ssf1E3 owhrange!
require (thatsthe.primaryspressure:::be5determinedJfrom5all available controlu roomiindicatis$froinsbothicrassME?widansh@s ihdicstionfand"the:::nonHClasM1Ejlow3ange[10ldicatidn$tb3bd$less r6cendKwithsthe"~
- thantthe?SDCScdesightpressurel;and;then;p?fodentry31nto rsst6rationtof power?andIvalvef; alignment shutd o'wn i co611ng'..fInf theh even tf ofs a ilds sl ofs honsiE3120AC ?p6wsid the21ow Urangei
- indicationtmay:Tnothbei:availableW Withithe~ '~
proposedidesign.Tchange?ClassN1Ejlow i rhngefindi6 atiodlav'5"ifabl5
' ^ ^ "
underLtheselcircumstan6esiandswillPenableC6perators R6" d e t e risins;.o t hei optimum':[pr ds sh r el:ifo rl; ent ryjin to :Lshu Ed bwn@ol'iQ Bbthi theTShstdown L Coolihp!Sps tem {shd ytheTAcEidsht?Hohlt6rihy Spstem twilli have :l improved jinstrumentationi asf aliresult ::iLof?Lthi5 proposedichange. No?newHfailureimodesfare1 created Jbpj:the" proposedidesign:changedIfdthere?werelatfailurefoftonegsGcti'6h isolatiorif valveitoiopen,[thepconsequences fwouldibeErsdUced' becauseithel 'c.apabil'ityf toJopen:, thef remaining! valves s attthe Yegnired J RCS :: pressu re Lwill;i be (improvedK 3 If f oneTof6 theWalfss f ailed l;open, f the ? increase _d ? accuracy. 6f : thefinterlocktonl.the seconds. valve? ( in t thelsame y flowpath ).LWilli reduce (the" co'nsequences:by ensuringithatkthe[secondsvalve0cannottbelopehed when g theiRCS l pressu refis 4 too ::!high.
\\
Since no safety systems or accident monitoring systems are adversely impacted by this design change, there will be no j
increase in radiological consequences due to an equipment i
malfunction.
Thetefore,'the.proposedidesign changeTwill notTincrease;1the consequences.of;a-malfunction;of'equipmentEimportant toisafety.
AFFECTED SECTION CHANGE #1 Rev.0 Page 77 DCP 2&3-2005.00SJ Rev.O B5.
May the proposed activity create the possibility of an accident of a different type than any evaluated previously in the SAR?
RESPONSE:ENO2 Ths?phrp6sef 6f((ths7SDCS (sh~c tilohl?!1s61XEf6hWiliFsilhEsfibcksf'is tos:ensdred thst3the!SDCSRcannot!Theloverpsessurizsdsby' ~ ~
Ansdvertentnopeningiof;s{thssshcE1onnisolstion@sivesGTEs replacementi;ofItheiexi tingMowjangsjpressurizsWpssssufs transisitters Rwith'? thsi neslR6semountS115'4f Ssfies f Ef tian~smittsid increases thsiacbdracysofEth'eT6 pen}$srmissivsjintnrlocksfahd" '
d6ssinotichange{the7designifsnction;of?thsishstdowhiboolihg~s;jj systsm.The:: design?;changequiifd;hotscreats$nesiniodes$ofiffdiluf Mo tive fp/ RCS i prs s sdre fisig rea t erj:than1SDCSide sighs piss su re h[^
ower f is t removedE f rom.i ondWalVe sii;iM each t:SDCS$flos);ipath~~~
khenevsr Thiaf prevent s, thessi:.valvesif E6m? bsihg sidsdYsrtentlyj opshsdshf' sitherian?)operati6nalisrrorfor{anisquipmentyhisifuhetionH As~
explainedfin sresponsey tofghsstii6nj:.BinaiLOCA?dbring~s shdtdouh
~
'co_olingbisin otE a.ic r. ed i_bl e t eventi '
~
' ~'
~"
~
^ '
ASC,l T6sISDCSE. W11116s7pf6tischsdif.fb.diT69,s.m@Fessd.Ef_h^s.mE16HTE.E=idiElEIp;._fs, i
m
- m..
is ' JCldssT1El?Widstrudis?hhd1l:1^6w?ishisipisss5fsTihd16EE16h51H t..h.e e:c o n t r. o i. t r o o m i.
~
FThs7is61ssi6n fdn6tif6nilsidesighsdisddh?f6sEI[E6TsfE51"s' 22 7
a'ctive i-f ailurelcadj..res ul t91nfovsrpjes suhiil'ngthe TSDCS}
E M DivefeitipJih2NalVe lihEsrlohksQ di 7Adt!bmatiidfpfss sbisTidtisf1b6ksipfsifshE%EhsTisbidEI6h valvesifrom bsinghopsnedjuntilyRCSlpfsssurehis}less thanf SDCSj;~de, sign l pressure (
~
~
~
b3
- Rem 6vihgi m6tivs5pbusif f fonfodel551Vs7 ihi'ss0lfif l'oW pathe hen >RCSLpressurelisl:: greater $thansSDCS:[desigh w
gg c.
AdministfatiiVelcontrold;i Esqairihg 7RCSfpressufsEtielbs E
less than!SDCSLdesignTpres~sureipriorTtorrestoring powe r:0 and i opening ; t h e1SDCS ':ii s ola til of.valvs si
'~
Q
~KeylockLswitchssDarsi~~pr6videdi f ori: the7 SDCS Eisbla tilbh valv'es~.
1
1
' '. I i
AFFECTED SECTION CHANGE #1 Rev.0 Page 76 DCP 2&3-2005.00SJ Rev.0 C':L 1AlarmsEareipr6videdEtd;?aleftfoperstiors [thstiRCSJp~fessdid
- """mayjexceedLSD,CSjdesignipyessure."^
6?
f.Rs11.ef Jv.sivs fP.S,V!9349. ;
m, s
Ths3ffiditsd7hdditidnalfibsiisfitii~pfeili^6Hs1p?pF691didJbp7hsfisp pressnrelsensorsisdppliedsfrom differentsvehdorsliishnot
~ * ^ * ~ ^ '
signi,ficant withirespset./.ticiav,oiding?overpkessurizing[thsIS_DC.SE
(
~
33 ThsEsf 6Es U repiading7 thsE f 66Ef16Miissgs:ipEsssdEiEsET)'f^ s' 5His tiransmit t e rs iwithfan timpEoye'd/modelfsuppliedi bylone '
'6~"'
mandfscturer andirelyingionll)lantomatic?pressursiihEsif6cksi 2 Mtheirem'ovaliof E mot ive f poner if roms HV-9337h addii: HV-937.76uhsn" RCFpiessurefis{ greater!thahSDCSidssi$n)prEssuhe3 dndh3F "
sdministrativejcontrolsito bi6vldsisidiverse!mssnsKdffAssdfiny system : isolatdion L:willinotNicreat!eithe5possibili tpfdf ' '
^ ' ~ ~ ~ ~
ove rpres su ri:singi ths1SDCSlorf anotheri nes ? 6Mdif f srent% kihdO6f s,sbident2 fromf an.y:l..sedidwa ent. l.:. pre..w,.iouslyfeYs,idstedi ^ ' ' ~
- V a.
n, c
.s.w w
n - nu,-
D6sWoj ths':[AmprossmshFin}$tishssitfeQd6ddradfM6hsichanssiVili V
rsddce)thelmaximn'mipressbreithatJmightsbenexpefienced?at;SDC~
V estry[AndSillfisj rove:: thetchpabilitystoidsteriSDCninfaf tiimsip y
p
' ashion[.:consequentlpMitywi1RnoQcreatest-hejpossibii!itysofii[a5 f
accident thatf hasf not? beenipreviobslytevaluatedvinstihe/UFSAR?! ^
suchi;asf;overprsssureldamagef:tojthsfSDCispstemf orffsiluke[to'* '
enter ISDClwhe' s requiredt ' ::Bp;(following? thef340ipsid^
n adminis t ra t ive l limitf f orient e rlng:tSD.C ; f ollowing s;anVaccidsht?
the sope ra hor s :would!bsi abl ei thTensbie? that:;ithel RCS $ pses sdresis holhigherfthad4390)pala{oM365$ psia;{wheh[odetorffourWloWrings measurements,fresp'ectivelykwerelavailableic!A11Eofsthese" pressureslwould.beTinscompliancekwithitheTASME{ Code {of:k:; rec 6fdU Thefimproved TLUs1willslimitsths%16westipossiblespressu s?that r
migh' 0 be f requiredi to i clearlthelL OPIs htherebp2 decressingiths^~ '
t potsstiallfor?havingho{sktendithe{depkessuri:sst'ionsperidd]62 toFoverrideTtheLinterllocks[whehitheLsvallableitimehmighthbsf~
limited;
^
" ~
Therefore, this change willTnot create the possibility of an accident of a different type than any previously evaluated in
~~
the UFSAR.
i AFFECTED SECTION CHANGE #1 Rev.0 Page 79 DCP 2&3-2005.00SJ Rev.O B6.
May the proposed activity create the possibility of a malfunction of equipment important to safety of a different type than any evaluated previous 1v in the SAR?
RESPONSE
NO; Thsisepiddement.[ lowjrahcj sfpfssiiUE1EsEIpf es sUEe[t2Enssit t' VsSe sdvironmentally/andiseismicallysgualifiedit6fthel:same*
~~
re'qUirements ! as i he3 existing:/ transmitters isndil:sre:tmdrsisccuiratis t
^
thanithe! existing 4transmitterslunderfbothinormar:Landsharsh^
en91fonmentalicondition sMThs/ propos sdi design (change isillsidB impact ;i the l exis ting ; f silureTmode s and i e f fset s):analys es~'
-^
s applicable / oitheJ SDCS J suctionSisolati6n svalvssland[ Safstip t
InjsctiodLTanks0isolstionKvalvesisincelhoinessfailureimodeMsrs created lby?theireplacementlofltheslowkiange[ppessurizer pressursEtransmi'tters; l
Howeverb the':plantiEdesignibss;iWiiic16 des;[t!hs);NRC/Bridch TschnicalLL Pos ition : RS B 95ilif requir's~ms_nt s s;.f drfdive ss e? and independenthinterlocks 4 dni thetisolatidn s;vslvss)be twsedit!hsThig"h pressuresRCS1andftheflow?pressureiSDCSi??SCE5comsittedsto"~ ~
satis fy { thisidivefsity}isqbirenient}[byj using r akcosb;inatibnifof Foxboro?and Rosemount4 pressure 1 transmit terssfori helSDCS OPI i
intie rloaksiand Walvel open f alarms h
' ~
t O
~~
The L purp6ss Eof fensuring/ the FShutdowhEC6ollhg?S stish?('SDCS)j
(
isolationivslvesf are<not?idsdvertentlyy6penedfissto!psevenEliitihs possibilityiof M overpressurizing i thelSDCS.:s Mditiple$means $;aiel:iin place ': to;; ensure J thats thelSDCS f pipissiWillitioti be isnbj sstied :( ta ~~
overpressure Tas;giveniinithej f oll.owing ::
1:
Class?1ElwidsfrangeEandfloulfa;hggjysssdie?indicatidd initheicon.trolS,roo.m; 2.
!Ths~:? is olstiisiUfdh6t ibsbfsEdssi5nsdissch?Ehst:Idd singlefactiveyfailure cansresultiinfovsrpressufisind c
the(SDCS.
3C T DlVs Esit!y fin t vslve Tintisrl ock's';
al AutomatiiE prsssdie7ihtissl'6cksiprsVs'nt!Tths
' isolation:vsive']fromLbeingi: opened $dntilLRCS s
pressure;isclessithanlSDCS: design;. pressure.
Pis Ving m6tise;7pdsek?ffonif6nsf vslvs'finieabh b '.
o flow ~ path lwhen RCSjpressurefis>[greaterithan;SDCS design pressure.
d i
b-d W L V.
f AFFECTED SECTION CHANGE #1 Rev.0 Page A
{
DCP 2&3-2005.00SJ-Rev.O N
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i 1
AFFECTED SECTION CHANGE #1 Rev.0 Page Bl DCP 2&3-2005.00SJ Rev.0 i
B7.
Does the proposed activity reduce the maroin of safety as defined in the basis for any technical specification?
RESPONSE
No.
Tedhni6s1TSpsci fibst16hs? S eO tionj 3 /~413 T3 "! 6 ?isjappli;bsblRES DSPDS isubdooled s ma rginimonitf ors) ~
~
~ ~ ~
The}Shutd_onniCo'olingyspstemisdctibnfisoistilbnj slvespressure
'interlockstare? covered by.:iTechnicals Specifications li3/y4T1:
475122 stim Tschnical? Speci fibaticns1S eh tiohs% 3 /4147174 y14shd% /4 N?2^'*"
covsrf theloperationL:bf::)thefshutfdown?coolingj:systef^" ~~
Te chni' call SpscificstionsiS edt_ibnf 3/4';;;4] 823111andh 3/4M8?M2~
c60eriSDCS delief[valvetOperation E
~ " ~ ^ ~
Technica19Spedificstions & Ssctiddi3/.4741173 ?EbysissSHOtidOWS CoolingiTrsinsLandsResetdn Coolant (L60psT^^
"~
Thel prop 6s edide s ignibhancje jihblude s fonlyf shhhh;ceineht'sVtblEhs currentide s ign bifimprovingi the :L ad esra cy3 of f sxis tfiiicjWs1vs"^'^~
ihterlocksi snd i of $ thefsubcooledimargin9cul6Ulstii6nNand*
providing.f additionall Class 9l1El picessure$1ndichtfidni L [SEsEss{sHd component [f snc ti;ohland f d.esignj; rsquifsinent s} willy hbltdbe fd1t(sredy consequentlyb theretwi-1E be;n'odimpactfonsthelbases@for%then
^
TechnicaffSpecificatiodsL:!mentionedt aboveidndithe::imarg~ ins Eof
'sfety:1Willinotsbel:' reduced.
' ~'
' ^^
^ ' ~ ~ "
~ ' ^ ^ ^ ^ * ~
sSisch ~tihe~inodifiestiion~Gork" involves replacement of existing 5
transmitters and adding signals to existing QSPDS Channels A &
N B,
the loading on the 125VDC batteries and 120VAC UPS will not q'
be affected. Consequently there are no changes to the diesel generators loading profile.
Ths7nssT6ff1owWahge[ pre s shf si tirsnsnIitiisf57niin6 f ac Edfsdlb2' dif f eredt; vendors lto;:satisfyfBTPlinterloc}6 divessitiy~
requirements (was facceptediiniSectioni;7 (6f.l1Eofd NUREG @i2M; ths Safety Evaluationf Report <fori.SONGSh jIn$anTadusrffliM1995 telephoneiconversatilon withithefNRCi-(minsbesfareiattached$E0 Sectionl3Lof ftir.e?ASC)',J1tfwssfcbncluded6thatRthsidiberse" ~ '
intierlock requirementsifordthefisolstiontva19esYsressatisfisd byl adminis t rative E cont rols7 andithetremovalME :? powe rs f roniMne "
suction isolatichivalve?in(eack/shutdownMcN 11ngsflowpathjwhed i
theIRCS pressurelexcesdeiSDCS[deJign jress heh ) Cons leq0entlp):!'
then proposed'L esignf change,(whichfutiliii siiransmitterst:from~^
d t
one.LvendorJ willf notN change) the':desiguj basi ilf 6rs the[SDCSinos thejRCS..1SincedthetTLUsafordthelreplacementitransmitters{srs lower-than those.;)forithe1originalEtransmitters Munder)both~
normal t and Taccidenti: conditions Mall ( systemTfunctions LWhich?sfe impactediby:instrumentiaccuracyEwillshaveja3greaterEmarginJof safetygunder proposed: change.
i
3 ::
AFFECTED SECTION CHANGE #1 Rev.0 Page g DCP 2&3-2005.00SJ Rev.0 beimaintsinsdN and ; accurate 3nsasurssent/6fis?ihd65ishdsH6sIWill E5fstiidgTChshdsiffsspsisEi6n; ffsddhdsEdyfshd wi.~l1,8 bes ac. hie.v.sdilov~er! thetwhole, t range 7of4RCS $pses,s 2
hbccolsd?msr in'~~
~
--.~
---a P6WsWsillRnotM b~s?fsit6Esd7Y6T HVE 9337EshdIHVI9377'M Ah^dl3h5ESDds willihot s bdiallined B toibheIRCS [dht ill t!nsiRCS3prEsshee $is %dlos"'
intsklocin esign (jrse sdieh[The[cdrrshts$bpsdipesmissiVE^*'^#~~'~'
theySDCSid s e tpointM ( 376 ? psla)3 N111p notn be'shhahged (shasbsssdFBn
'thetTLU3calenlationsifEhelinsWII6i/ vahssjbFssenrizer@issshEs^'~
Rosemountil transhi t$ tis rs iUAdsrlb6thni6EmalM and!p"6AEPa6) Fd
[
tiransmit tessi have%e tt sr7AccaiaIiyu t!hsnitheyeMistilhg!
61dsnt'^" ^
hafs@ienVirohmentsT
" ^ ^ " ' ~ ~ " ~ ~ ~ ' ~ ~ ~ ~ ' ' " * " ^ * ~ ' ~ ' ~ ~ '
Therefore, replacing the fohr low'-range pressurize'r~pressurs
~ ~ ~ ^
transmitters' with an improved model supplied by one' manufacturer and relying on 1) automatic pressure interlocks'/
- 2) the removal of motive power from HV-9337 and HV-9377 when ^
RCS pressure is greater than SDCS de' sign pressure, and 3)' '~
administrative controls to provide a diverse means of assuriEg
^'*
system isolation will not,re, duce, the margin of safety.,"~
y a
l I
l l
i
, '. l
~
1
)
AFFECTED SECTION CHANGE #1 Rev.O Page 83 DCP 2&3-2005.00SJ Rev.O
]
2.C MODIFICATION OF QSPDS/Gf946 SOFTWARE TO ACCEPT LOW RANGE PRESSURIZER PRESSURE SIGNALS AND OPTIMIZE PRESSURE INPUT FOR CALCULATION OF SATURATION MARGIN lWANDITHE[DELETI_ONIOF2CFMSESATU. RATION
' ~ " " "
MARGINfCALCULATIONlALGORITHM7"" "
e n
n na%i Sse s + + ;.kw vn.hn.%9 '>
%mai4we &w:s x ;&.4:
C1.
May the proposed activity increase the probability of occurrence of accident evaluated previously in the SAR?
RESPONSE
NO The proposed addition of low range pressurizer pressure transmitters from channels 1 & 2 to QSPDS channels 1 & 2 and the modification of software for the calculation of Subcooled Margins at RCS piping, Reactor Vessel Head and Core Exit Region will improve the accuracies of the Subcooled Margin Monitors at low RCS pressures under both normal and post accident conditions. The proposed modification will significantly reduce the margin loss experienced with the existing wide range pressurizer pressure inputs used as reference RCS pressure in the Subcooled Margin calculators. QSPDS acts as a safety related isolation device for the inputs to the CFMS computer and the proposed modification will not affect the isolation between the safety related systems and the non-1E CFMS. The modifications to CFMS include the options added to the SCM display user control dialogue page 130 and the changes to the display 2 (3)UJ0051F on 2 (3)CR056. These changes will enhance the information accessible by the operator on the CFMS CRT's and the Subcooled Margin display on the control board. The operator can select subcooled margin at CET, Head, RCS from QSPDS. or thc most conservativc subccolcd margin calculated by lASC*l CD's. The pressurizer pressure displayed will also be the wide i
or low range pressure based on the range selected for SMM calculations at QSPDS. Any failure of the display will not have any impact on the normal functions of the CFMS computer and the isolation between QSPDS and CFMS.
Tlisish tidia t16nVmafgis Nel culat'ibhi:lh/ theECFMSfohlp}:.'supiids tisRlid display 9page 311MIt(doe lsinot0interfaceiwithlany!otherfsystems~
33e, e g
~
and nofsafetyffunctioniis} performed;STheldeletionfoffthef isatiuration= margin ' calculation;algorithmL fromlthelCFMS Edoesf noti I
l
\\ '< I
- AFFECTED SECTION CHANGE #1 Rev.O Page 84 DCP 2&3-2OOS.OOSJ Rev.O iihpset?snpT6theFfdhcE16nsibfsths(stedisaturatiostmahjihidst3'CFMSNhbEdo OtherssystemsBBp/:usingsthe$calcUl fkomlQ' PDSMtheidisplsyjbagejmsintains@hsjsameldi'splap[^~"" ~
S fun,c tion.:La sj wouldibe Tobtainedj f rom (thelsatura tionimargin calculatordnsthelCFMS;;The:Jsaturationtmargin#:datasare 4gg
- g transmittedtbyktheffiber?; optic 1; data?linW whichlservesiss P,ageg411[ devic ~e.fTherefore';fany[fa11dresingtheQFMSjdisp1hy isolating noQimpac{QSPDSha The addition of low range pressurizer pressure signals to the QSPDS will provide Class 1E low range pressurizer pressure indication in the QSPDS. The software modifications in QSPDS computers will be tested in the off-line facility before being implemented in the plant and the verification and validation testing will be completed prior to start up to ensure proper operation.
The proposed modifications will provide more accurate indication of Subcooled Margins which are important parameters for diagnosing the plant conditions. The existing interfaces to other safety systems will not be affected by this design change. It will not increase the probability of safety systems being operated outside of their design or testing limits and will not modify the instrumentation accuracies or response times such that an accident is more likely to occur. QSPDS only performs mitigating monitoring function and is not a precursor to any accident previously evaluated in the UFSAR.
The proposed addition of low range pressurizer pressure signals to QSPDS/CPMS and the software and display moditications in QSPDS/CFMS will not increase the probability of occurrence of an accident previously evaluated in the UFSAR.
C2.
May the proposed activity increase the consecuences of an accident evaluated previously in the SAR?
RESPONSE
NO The proposed design modification does not change or prevent any protective actions assumed in the UFSAR Chapter 15 accident analysis. QSPDS computers provide Inadequate Core Cooling (ICC) monitoring which is a Post Accident Monitoring Instrument (PAMI) and the CFMS computer with isolated inputs from the QSPDS computers provide critical functions monitoring to enhance operator transient response capability, but they are not credited for any mitigative function in any accident analysis.
~. -
3 W,* '
~
AFFECTED SECTION CHANGE #1 Rev.O Page B5 DCP 2&3-2OO5.OOSJ Rev.O t
The software changes in QSPDS and CFMS computers-will not alter any assumptions previously made in evaluating the radiological consequences of an accident described in the UFSAR and will not adversely affect any fission product barriers, safety systems i
response or operation capability. The modified display pages will provide more accurate indication of subcooled margins and pressurizer pressure indications at low range conditions.
Therefore, the consequences of an accident
- evaluated previously in the SAR will not increase.
C3.
May the proposed activity increase the probability of a malfunction of equipment important to safety evaluated previous 1v in the SAR?
RESPONSE
NO The QSPDS computer is a Class 1E system which acts as an isolator for non-1E CFMS computer transmitting data through fiber-optic data link. The proposed design change requires j
software modifications in both QSPDS and CFMS. The addition of low range pressurizer signals to QSPDS requires cabling and terminations.which will be installed to the existing i
requirements. The installation will meet the existing separation criteria. The modifications to CFMS computer will i
strictly be limited to software, display pages and the display-selection options available for the subcooled margin display
-2 (3 ) UJ0051F. Since the data from QSPDS will be transmitte'd
-through existing data link the existing isolation will be maintained. No new failure modes are created by the proposed modification. No new electrical loads are imposed by the modifications to the QSPDS and CFMS computers. The testing of the software changes in off-line facility before implementation in the plant and the verification and validation testing prior to start-up will ensure that QSPDS and CFMS. computers will function properly. The proposed design change will enhance accident monitoring instrumentation function of the QSPDS by significantly reducing the margin loss of the saturation margin calculators and improving the accuracies of these monitors.
Reliable Class 1E indication of low range pressurizer pressure indication is made available in QSPDS to enable operations to i
p *. I ;
AFFECTED SECTION CHANGE #1 Rev.O Page 86 DCP 2&3-2005.00SJ Rev.0
' determine the entry into shutdown cooling.
Therefore the proposed modifications in QSPDS and CFMS computers will not increase the probability of malfunction of equipment important to safety previously evaluated in the SAR.
C4.
Hav the proposed activity increase the consequences of malfunction of eauipment important to safety evaluated previously in the SAR?
RESPONSE: NO The proposed design change will not affect existing displays and the ICC functions of the QSPDS computers and the functions of CFMS also will not be affected.The existing isolation between the non-1E CFMS and Class 1E QSPDS will not be affected. The changes will provide more accurate saturation margin indications and also make available reliable Class 1E indication of low range pressurizer pressure at QSPDS and C"MO.
No other protective functions of any safety related systems are affected by this design change.
Therefore the proposed design change will not increase the consequences of malfunction of equipment-important to safety previously evaluated in the SAR.
C5.
Hay the proposed activity create the possibility of an accident of a different type than any evaluated previously in the SAR?
RESPONSE: NO The proposed design change will improve the accuracies of the saturation margin monitors in QSPDS and CFMS thus enhancing the accident monitoring instrumentation. The addition of the low range pressurizer signals will make accurate RCS pressure available over the whole range of RCS pressure. The modification of software in QSPDS and CFMS will enhance accident monitoring capability. No safety systems or protective functions are affected by the proposed design change. The QSPDS changes are only to mitigating monitoring functions and therefore does not create accidents since the existing design criteria will be maintained to preclude this change from being an accident precursor.
Therefore the proposed design change will not create the
_ '[ l l AFFECTED SECTION CHANGE #1 Rev.O Page $7 DCP 2&3-2005.00SJ Rev.O possibility of an accident of a different type than previously evaluated in the SAR.
C6.
May the proposed activity create the possibility of a malfunction of equipment important to safety of a different type than any evaluated previous 1v in the SAR?
RESPONSE
NO The proposed design change will add low range pressurizer pressure signals to QSPDS and indication of the wide or low range pressurizer pressure selected by QSPDS for the saturation margin calculations via the fiber-optic data link at CFMS. The software modifications to QSPDS and CFMS will ensure that the margin losses experienced with the use of existing wide range-pressurizer pressure signals alone, are reduced significantly and provide more accurate saturation margin indications over the whole range of RCS pressures. Also reliable low range pressurizer pressure indication is made available to facilitate Operations to determine optimum entry into shutdown cooling. No new failure modes are created by the proposed design change.
The proposed design change will only enhance the accident monitoring functions of the QSPDS and CFMS computers.
Therefore the proposed design change will not create the possibility of a malfunction of equipment important to safety of a different type than any previously evaluated in the SAR.
C7.
Does the proposed activity reduce the margin of cafety as defined in the basis for any technical specification?
RESPONSE
NO Technical Specifications Section 3/4.3.6 covers the requirements of the accident monitoring instrumentation and Tables 3.3-10 and 4.3-7 provide the accident monitoring i
instrumentation channels and their surveillance requirements I
respectively. RCS Subcooled Margin Monitor (SMM) in QSPDS is one of the accident monitoring instrumentation required by these Technical Specifications. The proposed design 1
modification improves the SMM accuracy and reliability by selecting the low range pressurizer pressure inputs'for calculation of Subcooled Margins. Since the low range pressurizer pressure transmitters are more accurate than the
3 ': ;
'AFFECTED SECTION CHANGE #1 Rev.0 Page 86 DCP 2&3-2005.00SJ Rev.0 existing wide range transmitters at low RCS pressures, the saturation margin errors due to the high total loop uncertainties of the wide range pressure channels are significantly reduced by the proposed modification. In addition Class 1E low range pressurizer pressure indication is made available in QSPDS for Operations to determine the shutdown ~
entry conditions.
CFMS computer display pages and the Subcooled Nkrgin display on the control board are not covered by any Technical Specifications.
Therefore the proposed modification of Subcooled Margin Monitors within the QSPDS and CFMS computer systems will not reduce the margin of safety as defined in the basis for any
' Technical Specification.
1 i
i 4
)
,h:
AFFECTED SECTION CHANGE #1 Rev.O Page j((
DCP 2&3-2005.00SJ Rev.O 2.D REPLACEMENT OF PRESSURIZER LEVEL TRANSMITTERS 2(3)LTO110-1 & -2 D1.
May the proposed activity increase the probability of occurrence of an accident evaluated previous 1v in the Safety Analysis Report (SAR)?
RESPONSE
NO The proposed design change replaces the existing pressurizer level transmitters 2 (3)LT0110-1 and -2 with new Rosemount Model 1154 Series H transmitters. No other system interfaces are affected by the proposed modification and the loop functions are not changed. The new transmitters will have better accuracies than the existing transmitters under both normal and accident conditions. The new transmitters will be environmentally and seismically qualified to the same requirements as the existing transmitters. The new installation will meet the requirements of the existing installation. These transmitters are not a precursor to any accident previously evaluated in the SAR.
Based on the above evaluation, this proposed change will not increase probability of occurrence of an accident previously evaluated in the SAR.
D2.
May the proposed activity increase the consequences of an accident evaluated previous 1v in the SAR?
RESPONSE
NO The new pressurizer level transmitters have better accuracies than the existing transmitters under normal and post accident harsh environmental conditions and the response characteristics remain the same. There are no changes to the existing interfaces.
The proposed replacement of pressurizer level transmitters does not change, degrade or prevent any action described in any UFSAR Chapter 15 accident evaluation. Since the loop functions and design basis are not changed, the proposed design does not
D: 1 AFFECTED SECTION CHANGE #1 Rev.0 Page 90 DCP 2&3-2005.00SJ Rev.0 L
change, add or delete any function that mitigates radiological consequences or affect fission product barriers. The radiological consequences of any accident described in UFSAR Chapter 15 will remain bounded by the existing analysis.
Therefore, the consequenecc of an accident evaluated previously in the SAR will not increase.
D3.
May the proposed activity increase the probability of a malfunction of eauipment important to safety evaluated previously in the SAR?
RESPONSE
NO The new pressurizer level transmitters will meet the design, material and construction specifications of the existing transmitters. They are environmentally and seismically qualified to the same requirements as the existing-transmitters i
and installed at the same location to the same construction standards.
The new transmitters have better accuracies than the existing transmitters under both normal and harsh environmental conditions. The existing electrical train separation criteria will be maintained for the new installation The proposed design has no impact on the existing design basis protective action performed by the existing transmitters.
This modification does not reduce any equipment redundancy or independence of any system.
No system or equipment protection feature is modified.
No equipment duty cycle is increased beyond that assumed in the UFSAR accident evaluations.
No new or more severe testing, requirements are imposed since the affected equipment testing requirements and frequency will not change.
No other components important to safety are affected by these changes.
Therefore, the probability of occurrence of a malfunction of any equipment important to safety previously evaluated in the-SAR will not be increased.
)
.gp 7,f AFFECTED SECTION CHANGE #1 Rev.0 Page 91 DCP 2&3-2005.00SJ Rev.0 D4.
May the proposed activity increase the conseauences of malfunction of eauipment important to safety evaluated previously in the SAR?
RESPONSE: NO This modification replaces existing pressurizer level transmitters with qualified, more accurate transmitters. The new transmitters will have equivalent response characteristics as the existing transmitters and better accuracies under both normal and harsh environments. There are no changes to loop functions and the proposed design change will not create any new failure modes than previously-evaluated. Since no safety systems or accident monitoring systems are adversely impacted by this design change, there will be no increase in radiological consequences due to an equipment malfunction.
Therefore, the proposed design change will not increase the consequences of a malfunction of equipment important to safety.
D5.
May the proposed activity create the possibility of an accident of a different type than any evaluated previously in the SAR?
RESPONSE: NO The plant function or design basis is not being changed as a result of this modification.
No new seismic or electrical interactions are created since applicable design criteria are met for this modification. Replacement'of existing pressurizer level transmitters with new more accurate transmitters will enhance the protective and monitoring functions performed by these transmitters under both normal and harsh environmental conditions.
Therefore, the proposed design change will not create the possibility of an accident of a different type than any previously evaluated in the SAR.
, [. ! l AFFECTED SECTION CHANGE #1 Rev.0 Page 9E DCP 2&3-2005.00SJ Rev.0 D6.
May the proposed activity create the possibility of a malfunction of equipment important to safety of a different type than any evaluated previously in the SAR?
RESPONSE
NO The loop functions and the design basis are not altered by the proposed modification. No new seismic or electrical interactions are created since applicable design criteria will be met for this modification. The replacement of the pressurizer level transmitters ensures that reliable indication is available under both normal and harsh environmental conditions. The new transmitters do not change the failure modes of existing safety related equipment in a manner different from those already evaluated in the UFSAR.
Therefore this change will not create the possibility of a malfunction of equipment of a different type than any previously evaluated in the SAR.
D7.
Does the proposed activity reduce the marain of safety as defined in the basis for any technical specification?
RESPONSE
NO Technical Specifications Sections 3/4.3.3.5 for Remote Shutdown i
Monitoring and 3/4.3.3.6 for Accident Monitoring Instrumentation include pressurizer level as one of the required instrumentation channels. The proposed replacement of pressurizer level transmitters with more accurate Rosemount Model 1154 Series H transmitters will ensure that reliable indication of pressurizer level is available for normal and post accident monitoring.
Technical Specifications Section 3/4.8.1, 3/4.8.2 & 3/4.8.3 cover the A.C.,
D.C.
& Onsite power distribution system.
Since the power requirements for the replacement transmitters are the same as the existing transmitters, the loading on the 125VDC batteries and 120VAC UPS will not be impacted.
' Consequently there are no changes to the diesel generators loading profile.
Therefore, the margin of safety as defined in the basis for any Technical Specification will not be reduced.
i
I*
d AFFECTED SECTION CHANGE #1 Rev.O Pago j((
DCP 2&3-2005.00SJ Rev.O 2.E REPLACEMENT OF STEAM GENERATOR WIDE RANGE LEVEL TRANSMITTERS 2(3)LT1115-1,-2 AND 2(3)LT1125-1 AND -2 El.
May the proposed activity increase the probability of occurrence of accident evaluated previously in the Safety Analysis Report (SAR)?
RESPONSE
NO The proposed design change replaces the existing steam generator level transmitters 2 (3) LT1115-1 and -2 and 2 (3) LT1125-1 and 2 with new Rosemount Model 1154 Series H transmitters. No other system interfaces are affected by the proposed modification and the loop functions are not changed. The new transmitters will have better accuracies than the existing transmitters under both nornal and accident conditions. The new transmitters will be environmentally and seismically qualified to the same requirements as the existing transmitters. The new installation will meet the requirements of the existing installation. These transmitters only provide post accident monitoring function and are not a precursor to any of the accidents evaluated previously in the UFSAR.
Based on the above evaluation, this proposed change will not increase probability of occurrence of an accident previously evaluated in the SAR.
E2.
May the proposed activity increase the consequences of an accident evaluated previously in the SAR?
RESPONSE
NO The new steam generator level transmitters have better accuracies than the existing transmitters under normal and post
)
accident harsh environmental conditions and the response j
characteristics remain the same. There are no changes to the existing interfaces.
The proposed replacement of steam generator level transmitters doeu not change, degrade or prevent any action described in any UFSAR Chapter 15 accident evaluation. Since the loop functions
1
- ,( [
1,*
~
AFFECTED SECTION CHANGE #1 Rev.O Page 94 DCP 2&3-2005.00SJ Rev.0 and design basis are not changed, the proposed design-does not change, add or delete any function that mitigates radiological consequences or affect fission product barriers. The radiological consequences of any accident described in UFSAR Chapter 15 will remain bounded by the existing analysis.
Therefore, the consequences of an accident evaluated previously
'in the SAR will not increase.
E3. 'May the proposed activity increase the probability of a malfunction of equipment important to safety evaluated previously in the SAR?
RESPONSE
NO The new steam generator level transmitters will meet the design, material and construction specifications of the existing transmitters. They are environmentally-and seismically qualified to the same requirements as the existing transmitters and installed at the same location to the same construction standards.
The new transmitters have better accuracies than the existing transmitters under both normal and harsh environmental conditions. The existing electrical train separation criteria will be maintained for the new installation. The existing transmitters function mainly as Post Accident Monitoring Instrumentation and the new transmitters will enhance this application since they have better accuracies-under post accident environmental conditions.
This modification does not reduce any equipment redundancy or independence of any system.
No system or equipment protection feature is modified.
No equipment duty cycle is increased beyond that assumed in the UFSAR accident evaluations.
No new or more severe testing, requirements are imposed since the affected equipment testing requirements and frequency will not change.
No other components important to safety are affected by these changes, t
Therefore, the probability of occurrence of a malfunction of i
any equipment important to safety previously evaluated in the SAR will not be increased.
~
E AFFdCTED SECTION CHANGE #1 Rev.O Page 76 DCP 2&3-2OO5.OOSJ Rev.O E4.
May the proposed activity increase the consequences of malfunction of equipment important to safety evaluated' previously in the SAR?
RESPONSE: NO This modification replaces existing steam generators level transmitters with qualified, more accurate transmitters. The new transmitters will ensure that reliable steam generators level is available for normal and post accident monitoring.
Since no safety systems or accident monitoring systems are adversely impacted by this design change, there will be no increase in radiological consequences due to an equipment malfunction.
Therefore, this change will not increase the consequences of a malfunction of equipment important to safety.
E5.
May the proposed activity create the possibility of an accident of a different type than any evaluated previously in the SAR?
RESPONSE: NO The plant function or design basis is not being changed as a result of this modification.
No new seismic or electrical interactions are created since applicable design criteria are met for this modification. Replacement of existing pressurizer level transmitters with new more accurate transmitters will enhance the monitoring functions performed by these transmitters under both normal and harsh environmental conditions.
Therefore, the proposed design change will not create the possibility of an accident of a different type than any previously evaluated in the SAR.
E6.
May the proposed activity create the possibility of a malfunction of equipment important to safety of a different type than any evaluated previously in the SAR?'
1
RESPONSE
NO The loop functions and the design basis are not altered by the r
tII 7 AFFECTED SECTION CHANGE #1 Rev.O Page 96
-DCP 2&3-2005.OOSJ Rev.O proposed modification. No new seismic or electrical f
interactions are created since applicable design criteria will be met for this modification. The replacement of the wide range steam generators level transmitters ensures that reliable indication is available under both normal and harsh environmental conditions. The new transmitters do not change the failure modes of existing safety related equipment in a manner different from those already evaluated in the SAR.
Therefore this change will not create the possibility of a malfunction of equipment of a different type than any previously evaluated in the SAR.
E7.
Does the proposed activity reduce the margin of safety as defined in the basis for any technical specification?
RESPONSE
NO r
The steam generator wide range level transmitters are covered by Technical Specifications 3.3.3.6 which covers the f
requirements of accident monitoring instrumentation channels.
The steam generators wide range level instruments are listed in Table 3.3-10 and their surveillance requirements are listed in Table 4.3-7.
Technical Specifications Section 4.4.1.3.2 covers the surveillance requirements for hot shutdown, states that the required steam generator shall be determined Operable by verifying the secondary side water level to be 2 10% (wide range) at least once per 12 hours1.388889e-4 days <br />0.00333 hours <br />1.984127e-5 weeks <br />4.566e-6 months <br />. The TLU calculations have determined that with the new steam generators wide range transmitters the 10% step value is above the minimum operating limits and acceptable.
l The replacement of the existing Rosemount model 1153HD5 level transmitters with the more accurate Rosemount model 1154DH5 level transmitters will improve these post accident monitoring instrumentation channels.
Technical Specifications Section 3/4.8.1, 3/4.8.2 & 3/4.8.3 cover the A.C.,
D.C.
& Onsite power distribution system.
Since the power requirements for the replacement transmitters are the same as the existing transmitters, the Class 1E 125VDC battery systems, 120VAC UPS systems and the diesel generators i
loading profiles are not affected by the proposed modification.
Therefore the proposed replacement of steam generator wide range level transmitters with more accurate Rosemount model 1154DH5 level transmitters will not reduce the margin of safety as defined in the basis for any Technical Specification.