ML20137L359
| ML20137L359 | |
| Person / Time | |
|---|---|
| Site: | Saint Lucie  |
| Issue date: | 05/24/1996 |
| From: | FLORIDA POWER & LIGHT CO. |
| To: | |
| Shared Package | |
| ML20137K821 | List:
|
| References | |
| FOIA-96-485 JPN-PSL-SEIS-96, JPN-PSL-SEIS-96-028, JPN-PSL-SEIS-96-28, NUDOCS 9704070207 | |
| Download: ML20137L359 (11) | |
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9 PAGE 1 OF 11 FLORIDA POWER & LIGHT CO SAFETY EVALUATION Wide Range NIfemporary$ystem Alteration ST LUCIE NUCLEAR PLANT UNIT 1 JPN-PSL-SEIS-%028 REVISION 1 SAFETY RELATED l
9704070207 970402 PDR FOIA DINDER96-485 PDR
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JPN-PSL-SEIS-9tLO26
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REVISION 1 PAGE 3 OF 11 4
i REVIEW AND APPROVAL RECORD 2
PLANT ST LUCIE UNIT 1
i J
TITLE Wide Ranae NI Temnorary System Alteration l
LEAD DISCIPLINE I&C ENGINEERING ORGANIZATION St Lucie Site Enaineerina REVIEW / APPROVAL:
4 CHIEF ENGINEER: ELECTRICAL N/A INTERFACE TYPE GROUP PREPARED VERIFIED APPROVED FPL APPROVEC*
INPUT REVIEW N/A l
mm-MECH X
N/A N/A ELECT X
mi a k.N[k bd N
- l N/A I&C X
civil X
N/A
/4 h N/A LIC" 1
CSI X
N/A N'JC FUEL X
N/A GTHER X
N/A
- For Centractor Eva's As Determ ned By P-ojects
" Deview Interface As A Min On All 10CFR50 59 Ed:
and PLAs FPL PROJECTS APPROVAL:
$ ld M DATE:
5/24/%
t
JPN-PSL-SEIS-964T28 REVISION 1 PAGE 3 OF 11 4
TARI F OF CONTDITS SECTION "MTLE g
Cover 1
Review and Approval Record 2
Table of Contents 3
Abstract 4
1.0 Purpose and Descripoon 5
2.0 Licensing Requirements 6
3.0 Analysis of Effects ce Safety 6
4.0 Failure Modes and Effects Analysis 7
5.0 Plant Restricoons 7
6.0 Effect on Technical Specificates 7
7.0 Unreviewed Safety Question 8
Determinanon 8.0 Actions Required 9
9.0 References 10 - Gamma-Metrics Letter 11 1
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JPN-PSL SEIS-95428 REVISION 1 PAGE 4 CF 91 4
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ABSTRACT l
1.0 ABSTRACI 4
j nis safety evaluation provides for installation of coaxialjumpers to allow for connection of Wide Range N1 Detectors #2 (MB) and #4 (MD) to the preamplifier input for detector channels # 1(MA) and #3(MC),
respectively. His modificate will accommodate the analysis which requires that the locations adjacent to the MB l
and MD detectors be loaded fint during the fbel shuffle and the Technical Specificata, which require two operable wide range log detectors in modes 3,4,5 & 6.
The current design basis for fuel reload activities requires the use of Wide Range NI Detectors #2 and #4 to monitor sub-critical multiplication. His provides assurance that the core remains sut>. critical during the addition of eactivity while fuel reload is in progress His safety evaluanon provides for an ahernanve nuclear instrumentation system (NIS) wide range detecear j
arrangement wtuch subeututes the Wide Range N1 channel 2 (MB) & 4 (MD) desectors for the Channel l(MA) & 3 (MC) detectors ne MB and MD detectors will be -maito the new MA/MC electronics, inenstad by PC/M i
009 195. Additionally, the MB and MD channel electronics are out of service for implementation of the PC/M.
i This evaluation will demonstrate that plant aealtarwm ofjumpers to maintain two operable Wide Range Ni channels in Mode 6 is acceptable and does not represent an unreviewed safety quescon as defined in 10CFR$0.59.
Derefore, prior NRC approval is not required.
Rev. t.
Purpose of this revision is to evaluate a concern of inadequate physical separation between cables of redundant channels involved in the temporary configuration. The additional evaluabon resolved the subject issue and therefore this revision does not change the conclusions of the original safety evaluation.
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JPN-PSL-SElS-96-026 REVISION 1 PAGE 5 0F 11
- o 1.0 PURPOSE AND DESCRIPTION 1
l This safety evaluation provides for an alternative nuclear instrumentation system (NIS) wide range detector arrangement which subotnutes the Wide Range N1 Channel 2 (MB) & 4 (MD) detectors for the Channel 1(MA) & 3 j
(MC) detectors ne MB and MD detectors will be cosmected to the new MA/MC electronics, installed by PC/M 009 195. His modificanon will accammodate the analysis which requires that the locations adjacent to the MB and i
)
MD detectors be loaded first during the fuel shuffle. Additionally, Technical SpeciGcations require two operable wide range log detectors in modes 3,4,5 & 6. The MB and MD chanael electronics is out of service for l
implementation of the PC/M.
This safety evaluanon provides for installation of a coaxial jumper to allow for connection of the MB and MD l
detectors to the ampli6er circuits of the MA and MC channels via jumpers.
a The Wide Range Ni system consists of four inayadent ehmanals that =anmar reactor neutron flux dunas reactor j
power operanon. De neutron flux signals crigmate from fission chamher detector assemblies. Each deaector contains two fission chssabers. The Wide Range NI channels monitor wide range power on a logerstlunic scale over i
the range of Ix10-g% (2x10-g% new system) through 200% power and rase of change of this logandunic power j
j over the range of 1 to +7 decades per minute. Output functions include providing rate of change power information to the control room cnd Reactor Prosecuon System (RPS) and indication of reactor power during I
nonnal and transient operenns conditions,.
i
)
The anginal design of St. Lucie Unit I used neutron sources in the fuel assemblies in core taeaaaae A 10 and Y 10.
The tarmaans are on the penpbery and near Channels 2 and 4 Wide Range NI detectors. His configuration uses I
I Channels 2 and 4 Wide Range N1 detectors to monnor sub cnncal multiphe= nan during fuel reload. Reference 9.11 l
provided an evaluation that allowed the use of fuel a===hbas wnhout sources in these core lac =aane primded the
]
l fuel assemblies met censin initial ennchment, burn up and time since shutdown requiren' ents. De reference 9.11 l
evaluation required that the fuel assemblies meeting this criteria be loaded in core locaticia A 10 and Y 10 (near i
Channels 2 and 4 Wide Range N1 detectors) as the first seep in a fuel reload to provide a detector count ruee
]
suf%ciently above background so that sub cntical muhiplicanon can accuranely be measured. The remaining fuel is l
then reloaded in a sequence that maintains neutronic coupling to Channels 2 and 4 Wide Range NI detectors This l
provides assurance that the core remains sub-critical during the addition of reactivity while fuel reload is in Progress A
Unit i Technical Specificanons require two operable wide range channels are in Modes 3,4,5, & 6. In addmon, in Mode 6, one of the operable channels must be able to provide an audible alert in containment while fuel movement is taking place. Nonnally, the audible containment alert is provided by the MD channel. Since this channel will be i
out of service, the alert shall be reconfigured to use the MA or MC channel amplifier output, k
ne Wide Range Ni channels all utilize the sarne Class IE design detectors. Each detector is supplied with a coaxial j
connector which is terminated at the preamplifier input connection locateo in a junction box near the detector. The
.n < ontainment cable assemblies consist of a solid copper sheathed coaxial cable in a stainless steel, flevible metal i
i me. The coaxial input cables from the detector assembly connects to the type N connectors on th mput modules inside the amplifier housing. The MB channel detector coaxial cable is nonnally terminated at t' : MB prearnplifier l
in box B1074. Incend, the detector coaxial cable will be connected to the jumper cable.
The jumper cables are supplied by the detector manufacturer (Gama-Metrics). The jumper will connect the MB detector to the pre-amplifier circuit for MA, located in box B1069. The MD channel detector is normally terminated at the MD preamplifier in box B1130. This detector will be connected to the MC channel pre amplifier via a jumper from box Bl130 to B1077 The distance from box B1069 (MA) to I 1074 (MB)is approximately 45 feet. The distance from box B1077 (MC) to Bl 130 (MD) is approximately 50 feet. The cable will be fir'd routed, in compliance with i
electrical train and channel separation requirements addressed in Section 3.0.
I i
JPN PSL-SEIS-96 028 REVISION 1 PAGE 6 OF 11 2.0 L1 CENSING REOUIREMEMIS Technical Speciflentloes 1
Technical Specification 3.3.1.1 provides the requirements for reactor protective instrumentation. Table 3.3 1 notes the following with respect to the Wide Range Logarithmic Monitors:
For Modes I,2 and *:
A minimum of 3 operable channels is required.
For Modes 3,4, & 5:
j A minimum of 2 operable channels is required.
]
with the protocuve system trip breakers in the closed position and the CEA drive system capable of CEA withdrawal.
Technical Specificanon 3.9.2 provides the requirements for refueling:
For Mode 6:
A minimum of 2 operable channels is reouired, one with audibk indication in containment.
l MM Section 7.2.1 describes the Wkle Range Logarithmic Channels as follows:
four safety channels with me:ciple detec;or elements; monitors reactor power from source range to above 100% full power, provides a signal to the RPS fer rate of change of power indW and trip fi-w+6m provides a signal to the RPS for enabling the high rate of change of power trip above 10*/. power, and provides a signal to the RPS to remove the zero power mode bypass above 1% power.
3.0 ANALYSIS OF EFFECTS ON SAFETY The NIS includes the linear power range, power range control and wide range excore detector channels. These detector channel sets primde the means for control of the fission process by monitoring core power levels and generating the appropnase trips and alarms for vanous phases of reactor operstm6 and shutdown conditions.
The four Wide Range channel detectors are class IE and provide Safety Related functions. In Mode 6, the function of these detectors is to provide indication of reactivity changes. The existing detectors are functionally identical to the new model detectors and are fully compatible with the new electrcs ics. The modified systems have been venfied with the vendor (Gamma-Metrics) as documented on Attachment 1.
Electrical Train Senarwh The Wide Range NI detector #2, its associated cables and boxes, are nortnally considered part of the RPS MB channel. With the jumper installed, the Ni detector and jumper cable will become RPS Channel MA. Likewise, the s
Wide Range N1 detector #4 and its jumper cable will become RPS Channel MC. De MA and MC channels are powered from electncal train A. Thus, the cable routmg must mamtam separation from B train cables m Section 8.3.1.2.3 of the FSAR states that physical separation is provided between the electrical A and B (as well as the swing AB) load groups for protection against loss of the A and B trains from a single failure or event. Ph 'sical
__ separation of electrical load groups is provided by the use of spanal separation and/or erection of physical barners.__
The RPS measurement channels satisfy this reautrement bv physically emmtmo the MA and MC channels from the MB andMIE is which are powered from the A and_B trams, respectively. The cable routmg for me ahernative arra.ig.
en atisfy the A and B tram separanon entena.
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JPN-PSL-SEIS-96428 j
REVISION 1 PAGE 7 OF 99
>ChannelIndependence ed Separanon ne reactor protective system is designed to the requirements of IEEE 279 1971 and the General Design Critena which include L%e of the protective channels. FSAR Sections 7.2.2.2.6 and 7.2.1.1 state that the reactor protective system measuretnent channels are i=daa ad at and isolated and that the cables are routed separately from each other includag the electncal penetranon area. Physical separation as a part of channel LW is dermed in FSAR Secnce 83.1.23, " Physical Sepersoon". It dermes the minimum spatial separation criteria for uncovered redundant division raceways to be 18" honzontally and 4' vertically.
The Wide Range N1 detector #2, its associated cables and boxes, are normally considered part of the RPS MB channel. With thepumper estalled, the N1 detector andjumper cable will become RPS Channel MA. Likewise, the y'
Wide Range N1 desecaer M and itsjumper cable will harame RPS Channel MC. The jumper cables will act be routed in er=en Derefore, the jumper cables will maintain the design entena minimum 4' vertical and 18" bonzontal separanon from other redundant RPS channel cabling, except forfef*the jumper cable for deesceer N which will pass by the deaector RE 26 80B(SA) in the nuclear instnanentation amnet. His is acceptable, since all the permanent cabling in the instrumentation tunnel is routed in conduits or is armored. Further, MA and SA cables can be routed together, as long as they do not mix with MC cables (also true for the B system).
Safany Canasificatian This evaluanon is classified as Safety Relased since it involves modification of the Safety Related Nuclear instrumaneshan Wide Range detectors 4.0 FAILURE MODES AND EFFECTS ANALYSIS 4
The physical larmana of the detecte - for the ahernaove NIS excore Wide Range N1 configuration is identical that required by Ref. 9.11. De detectors, instrumentation wells, cabling and circuitry are the same design and meet the same speci0 cations and qualificanons Therefore, new failure modes are not created.
5.0 PLANT RESTRICTIONS The use of the alternative NIS escore detector arrangement is limited to Mode 6. The jseper esbles must be s
removed and original design restored prior to entry into Mode 5, N
Q The FS AR, plant drawings and other affected engincenng documents will not be revised due to the limited duration g of the alternative arrangement.
n 6.0 EFFECT ON TECHNICAL SPECIFICATIONS l
With resnect to Technical Snecificarian 311.1 for Made< 1 throuah 5-This evaluation is for Mode 6 and requires the circuit aheration to be restored to normal before entry into Mode 5.
Herefore Technical Specification 33.1.1 is not effected.
With resnect to Technical Snecification 3.9.2 for Mode 6:
l The only function of the Wide Range instrument in tha mode of operation is to provide indication of reactivity L Aanges and audibic_gnunt ratc; Operation in these modes includes operatmg in the extended range (51000 eps).
The modification allowed by this evaluation provides for tv o operable Wide Page Ni detectors and an audible count rate as required by Tecnnical Specificanon 3.9.2.
Based on the above discussion, implemert" < " N ahernative NIS excore detector arrangement does not require changes to the Technical Specifications
JPN-PSL-SEIS-96-028 REVISION 1 1
PAGE 8 0F 11 i
l 7.0 -
UNREYlEWED SAFETY QUESTION DETERMINATION l
In accordance with 10 CFR 50.59, the responses to below listed questions serve to determine whether the ahernative NIS excore detector arrangement constitutes an unreviewed safety question:
8 7.1 Does the proposed activity increase the probability of occurrence of an accident previously evaluated in the SAR?
ne effects of the alternative arrangement are limited to the NIS. This instrumentation is not paanilmd in i
the SAR to initiate an accident. Since the NIS is not postulated to initiate an accident, the ahernative i
arrangemeent does not increase the probability of occurrence of an accident previously evaluated in the j
SAR.
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7.2 Does the proposed actrvity acrease the caamp=== of an accident previously evalueesd in the SAR7 ne cam =ar*s of an accident previously evaluated in the FSAR are not increased because the ahernanve arrangement does not affect the ability of the NIS to perform its design basis function. As discussed in Secnons 3 and 4, the ahernatrve arrangement neither degrades nor prevents acuan used to j
mitigue SAR accidents.
e t'
7.3 Does the proposed activity increase the probability of an occurrence of a malfuncuon of equipment
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irnportant to safety previously evaluated in the SAR?
ne four Wide Range Ni channels and detectors have the same design and are qualified to the same I
requirements. The jumper cables are procured from Gamma-Metrics and are qualified for use in this applicanon. Use of the MB/MD detectors with the MA/MC channel Ni electronics does not affect the ability of the NIS to perform its design basis funcuan In addition, the attemative arrangement does not create new failure modes as discussed in Sections 3 and 4. Therefore, the probability of occurrence of q
equipment malfuncuon important to safety previously evaluated in the SAR is not increased 7.4 Does the proposed activity increase the c-==- of a malfunction of equipment important to safety previously evaluated in the SAR7 The four Wide Range Ni channels and detectors have the same design and are qualified to the same requirements. Use of the MB/MD detectors with the MA/MC channel N1 electronics does not affect the ability of the NIS to perform its design basis function. In addition, the alternative arrangement does not create new failure modes as discussed in Sections 3 and 4. The alternative arrangement neither degrades nor prevents action used to mingate SAR accidents. Therefore, the attemative arrangement does not increase the consequences of a malfunction of equipment important to safety previously evaluated in the SAR.
7.5 Does the proposed activity create tbc possibility of an accident of a different type than any previously evaluated in the SAR?
As stated in Sections 3 and 4, new frilure modes are nct created using the alternative arrangement. Since the detectors are the same and the system functions are not affected, new types of accidents are not created that are different from any already evhluated in the SAR.
7.6 Does the proposed acuvity create the possibility of a malfunction of equipment important to safety of a different type than any previously evaluated in the SAR?
As stated in Sections 3 and 4 new failure modes are r ot ameu L. 5e attema;ive arrangement. The attemative arrangement uses detectors with the ca.& t 4 ar.d uus;ification requirements and their
JPN-PSI -SElS-96-028 REVISION 1 PAGE 9 OF 11 NA functions have not changed The iumner cables are procured from Gamma-Metrics and are qualified for j
,use in this application. The change cannot result in the malfunction of any other plant equipment.
Therefore, the alternative arrangement does not increase the possibility of a malfunction of equipment I
important to safety of a different type than previously evaluated in the SAR.
7.7 Does the proposed activity reduce the margin of safety as defined in the basis for any Technical Specificahon?
The setpoints and operation of the detectors are unaffected by the ahernative arrangement; therefore, the proposed activity does not reduce the margin of safety as defined in the basis for any technical specificanon.
The alternative NIS excore detector arrangement does not adversely affect safe operation of the plant (per Sect >ons 3 and 4), does not consuture an unreviewed safety quesuon (per Sectaan 7) ar.d does not require change to the Technical Specifica'= (per Section 6). Therefore, implementation of the abernative arrangement does not require prior NRC approvat Revision 1 evaluated cable separation concems due to implementors request. The additional evaluation resolved the subject issue and therefore this revision does not change the conclusions of the onginal safety evaluanon S.9 ACTIONS REQUIRED 1.
Coaxial Jumper Cable assemblies shall be procured PC 2 or better.
2.
Installjumpers for the Wide Range NI channels as follows:
Disconnect the Channel MB and MD Wide Range Nl detector from the preamplifier in box I
1 B1074(MB) and Bl130(MD), respectively.
Connect the vendor supplied jumper cable assembly to the functional fission chamber of the j
Channel MB Wide Range detector Field route jumper cable to the Channel MA preamplifier box B1069. Tie-wrap cable to existmg structures as required. Connect the jumper coaxial connectors to point A3-Jl on the Channel MA amplifier per CWD sheet 60. Jumper connecuons shall be l
taped using Scotch 70 insulating tape per plant procedures to ensure coaxial cables and connectors are isolated from ground.
Connect the vendor supplied jumper cable assembly to the functional fission chamber of the Channel MD Wide Range detector. Field route jumper cable to the Channel MC amplifier box B1077. Tie-wrap cable to existing structures as required. Connect the jumper coaxial connectors to point A3 J1 on the Channel MC amplifier per CWD sheet 62. Jumper connections shall be j
taped using Scotch 70 insulating tape per plant procedures to ensure coaxial cables and connectors are isolated from ground.
l The 7* minimum bending radius specification must be stnetly observed. Sharp bends will break the copper jacket and destroy the cable.
I Jumper cables shall be appropriately tagged per applicable plant temporary circuit alteration procedures.
1 Configure the audible count rate speakers to use the MA or MC channel amplifier.
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JPN-PSL-SEIS-96428 REVISION 1 PAGE 10 OF 11 e
4.
Perform discriminator bias curve for each detector per Pre-Operational Test Procedure 1 1400280 section 12.13.
5.
Aher rewirms, verify proper operation of the Wide Range channels in accordance with Operating Procedure 1-1210051, 6.
The jumper cables shall be reasoved prior entry into Mode 5-
9.0 REFERENCES
9.1 St Lucie Unit i FSAR, Amendment 14.
9.2 St Lucie Unit 1 Techascal Speci5 canons, Amendment 142.
4 9.3 Safety Evaluanon JPN-PSL-SEIS-95-007 Rev. 3 9.4 Safety Evaluation JPN PSL-SENP-95-049 9.5 CWD 8770-B-327, Sheets: 58(R1),59(R2),60(RI I),6 dR10),62(R1 I),
9.6 LN 8770-11291, Neutron Flur Mimitar for SL#1 Rev. I 9.7 1/M 8770-9820, Gamma-Metncs RCS 200 Neutmn Flux Mannar. Rev. O I
9.8 Drawing 8770-G 369 Sh. I, Rev.10 a
}
9.9 Drawing 8770-G-364, Rev.18 l
j 9.10 Drawing 8770-G 187 Rev. 3 4'
9.11 Memorandum from W.M. Nutt to J.L. Perryman," Removal of Startup Neutron Sources from St. Lucie j
Units 1 and 2", FRN 89-1004, December 8,1989 i
j 9.12 Drawing 8770-13729 Rev. O l
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l' TPN PSL. SEIS. yg.a.g a At vision I i*
Pan H # ll l
( R4 & 4 l) l 5788 FACIFIC CENTR BLVD.
SAN DEB 00, CA. 92121 DATE:
May 23,1996 1page l
FAX 'IRANSMITTAL SHEET l
10: Horida Power andIJght l
ATTN: Mr.JefBartdati (407) 467-7556 i
ur. auck commen (407) 467-7s70 l
FROM: Ecbest Barnes, Project Manager 619 450-9311 x 156 i
GAMMA-MNI1t!CS FAX NO. 619 452-9250 l
Mesass i
Esfersaae: FFL t'aremrt i B94932-90011 l
f Tasaporasy ham'Baalsup i
i Since St. I.ucis Unit I reactor cors loaders prefer signals from the detectors located at the B and D detector quadraats fbr reloeding Unit I fuel, we have been asked so evahmte salag the old j
Chamael B and D detectors to supply fission chamber signals to the new Channel A and C j
cioccomics. Unk I chamaals B and D currently have GAMMA.MEIRICS part somber 200213-104 desacenes. Thoes h ano ideadcal to tbs amanicos 200643-101 doesceors (cunently a.c ms t St. Lacio na bosh the WR NIS and post accidas Nr chenacts la both Unies 1 a
and 2) except Ibst they have a tenited radiation liis (quahfled life 3 x 10 E 9 sads) organic cables from the flesion chambers to the junction beans. The 200643-101 lecteds about thirty fleet of adaeral laanhdag cabilms on tbs duencear and of the cable to examed the quaBSed & to greater tima 40 yees (quaB6sd Ms 4 x 10 B 10 reds, per GAMMA MK!RICS QuaBHcados Test Report
} 040). The chamast B and D duenceous have been opendag for about een yeen and, based ce verbst y
descripdan of cates fhilmses hans Mr. Cennsu, have acady reached the end of oessaic catds life.
-We aguas tiet jumeer cablas can ha nand an W - 9 dagna saatcables en the old
_ BWdesectors so the A3 (for SR and WR) preampli$crs on the new chanaal A and C k
electroncs to seload fuel The sensitivity of the asw electronics to tbs old single chamber 7
d= mar *wn should be N idemicat io the sensitiviry of the old eWien with the old single doescoors.
modined system is functicaany acceptable with the old detector driving]
ethe new
= h. OAhOdA RETRICDammian precautions should be observed
[nwnca e-iae cables to GAMMA-METRICS prmmali&rs to avoid preampliner damage.
/
Sinceanly, d~
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