ML20082R523
| ML20082R523 | |
| Person / Time | |
|---|---|
| Site: | Calvert Cliffs  |
| Issue date: | 09/10/1991 |
| From: | Creel G BALTIMORE GAS & ELECTRIC CO. |
| To: | NRC OFFICE OF INFORMATION RESOURCES MANAGEMENT (IRM) |
| References | |
| NUDOCS 9109160132 | |
| Download: ML20082R523 (14) | |
Text
Y B AL. tim ORC OAS AND ELECTRIC
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CHARLES CENTER
- P O. BOX 1475
- scnieRr !#0*
-,.o..u September 10,1991 U. S. Nuclear Itegulatory Commission Washington, DC 20555 NITENTION:
Document Contiol Desk SUBJIICr:
Calvert Cliffs Nuclear Power liant Unit Nos.1 & 2; Docket Nos. 50-317 & 50 318 limngency Diesel Generator Prniert introduction itEFEllENCE:
(a)
I. citer from Mr. D. G. Mcdonald, Jr. (NitC) to Mr. G. C. Creel, (BO&E) dated February 12, it'91, llesponse to Station Illackout llule (TAC Nos. 68525 and 68526)
Gentlemen:
As requested in the supplemental Safety Evaluation lleport for station blackout (lleference a), we are providing initial information concerning the a'klition of new Emergency Diesel Generators (EDGs) and the modification to the existing EDGs. Attached is a description of the proposed modifications to the facility. This description is based on the preliminary engineering done to date and may be modified as the project progresses. After your review of this description, we would like to schedule a meeting to brief you on our progress and answer any questions you may have, Shouki you inve any further questions regarding this matter, we will be pleased to discuss them with
- you, Very truly yours, 1r
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Document Control Desk September 10,1991 Tage 2 l
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D. A. litune, Bquire J. E. Silberg, Bquire R. A. Capta, NRC D. G. Mcdonald, Jr., NRC T. T. Martin. NRC f
L. E. Nicholson, NRC i
R. I. McLean, DNR J.11. Walter, PSC l
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NITACilMENT EMEltGENCY DIESEL GENERNIOHS f
I l.0 INTHODUrl'lON llattimore Gas & Electric Company (BG&E) is adding two safety-related perpency diesel r
generators (EDGs) at the two.umt Calvert Cliffs Nuclear Power Plant. %csc hDG5 are to support station blackout (,SBO) tequirements and to provide spare capacity for future plant i
modifications. The additional EDGs will enhance our ability to meet 10 CFR 50.63 i
requirements and Regulatory Guide (RG)1.155. Station lilackout studies indicated that at i
least one additional diesel was required to facilitate compliance with the SBO rule.
Currently, Calvert Cliffs has three EDGst one dedicated to each unit (EDO Nos.11 and 21) and one that swings to the accident unit (EDO No.12). Each unit will be served by one of the additional diesel generators. An EDO project was initiated to install two new self-cooled 5000KW (net) Class 1B EDGs to the 4KV bus system. Emergency Diesel Generator No.12 will be modified for use as an alternate AC (AAC) source and other hardware and software modifications will be made to bring Calvert Cliffs fato compliance with the SBO rule
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(Reference a).
Numerous systems inside the plant will be affected during the installation of the EDGs. The work consists of mechanical, electrical and control system modifications and realignment of t
the existing diesel generators. Modifications and additions to the Control Room panels will f
be required for the EDO controls. Emergency Diesel Generator No.12 wil; be made independent of the other four dicscis to meet alternate AC station blackout criteria in
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accordance with RG 1.155. For normal operation. EDO No.12 will be capable of being manually started and powering vital equipment. Emergency Diesel Generator No.12 will also be capable of service as a fully qualified Technical Specification replacement for any of the four Class 1E EDGs.
2.0 PRO.1ECI' DESClilPTION t
2.1 EXISTING DIESEL GENERATOR AND ELECTRICAL SYSTEM Calvert Cliffs Nuclear Power Plant (CCNPP) is currently provided with three EDGs, I
i all of which are required to be operable when both nuclear units are operating. Any L
two EDGs are capable of supplying sufficient power for the operation of engineered I
safety features during accident conditions on one unit and shutdown loads of the alternate unit concurrent with a loss of offsite power. They also supply power for the safe and orderly shutdown of both units under loss of offsite power conditions. The l
EDGs start' automatically on a Safety injection Actuation Signal (SIAS) or an undervoltage condition on the vital buses and are ready to accept loads in 10 seconds.
All necessary engineered safety features are duplicated and power supplies are
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arranged so that the failure to energize any of the applicable buses, or the failure of one EDG to start will not prevent the proper operation of the engineered safety r
features system.
Four 4160V engineered safety features buses are provided; two buses (11 and 14) for l
Unit 1, and two buses (21 and 24) for Unit 2. Emergency Diesel Generator No.11 is l'
connected to supply power to either 4160V bus 11 or bus 21 (ZA facility), EDO No. 21 is connected to supply power to either 4160V bus 14 or bus 24 (ZB facility),
I and the swing EDG No.12 (ZC facility) is connected so that it can supply power to I
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= - -, - - - - -, _.. -. - -.
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i AT.LACL1Mi3f EMEl(GENCY lilESI:1, GENEl(ATOI(S i
any of the four 4160V engineered safety features buses (11,21,14, and 24). See
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Figure i for diesel an angement.
I 2.2 PitOPGSED EMEl(GENCY lilESEl, GENEl(ATOlt AND EI.ECTitlCAls SYSTEM We plan to install two additional safety related EDGs. 'lhis will provide one j
dedicated EDG for each of the four 4160V engineeled safety features buses, with the fifth !!DO (existing sw.'.ig EDO No.12) used to mitigate Silo conditions and serve as a standby for any of the four liDGs. The existing lido No.12 will be modified for i
normal use as an AAC source or, when needed, as an auto stait/ load Class IE source.
Either of these functions will be selectable after the modification is complete. When selected foi use,ts an AAC EDO, the design criteria of llegulatory Guide 1.155 and NUMAl(C 87 00 will be satisfied. In this condition, it will be manually started and aligned outside the Control lloom. On some occasions. this EDO will be selected ihr operation as a normal Class IE power source. In this configuration,it will be pre-aligned to a particular vital bus as a replacement for a dedicated !!DO that is i
disconnected for maintenance. It will auto start and load the same as the dedicated
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I!DO.
'this lido is already designed and installed to meet the Technical t
Specilication requirements of any of the EDGs.
l It is proposed to connect the two new EDGs and the existing three EDGs as follows, (see Figure 2):
Connect the power feed flom one of the new EDGs (hereafter referred to as DGZA) to 4160V bus 11 (Unit 1 ZA facility).
i Connect the power feed from the existing liDG No,11 to 4i60V bus 21 (Unit 2 ZA facility).
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Connect the power feed from the second new 1100 (hereafter referred to as i
DOZH) to 4160V bus 24 (Unit 2 Zil facility).
i Connect the power feed from the existing EDG No. 21 to 4160 bus 14 (Unit 1 ZU fadlity).
P:tain the connection of the existing EDO No.12 to all four 4160V buses i
(11,14,21, and 24) but modify the inteilocks to permit energiziny any one bus under Silo conditions and as a standby for any of the four EDGs.
'Ihe two new 5000KW (net), air cooled EDGs me to be permanently installed in a i
new, seismically qualified, reinforced concrete building. *lhe liDGs and auxiliary l
equipment will be installed and maintained as Class lE equipment in aaordance with RG 1.9, llevision 2.
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6T[1C11MI:NT EMEttGENCY lilESEL GENEllATOllS Each EDG is to be aligned into the existing Class 1E 4KV power distribution system and to be supplied by its dedicated 480 VAC,1:'O VAC, and 125 VDC power distribution systems. The controls of each EDO and its associated equipment will be similar to the existing ones wl:
remote control, indication, and annunciation.
Similarly, the control features will include the EDO auto start on enginected safety features actuation or 4KV undervoltage signal and auto loading on 4KV undervoltage signal.
2.3 h10D11'lCATIONS 2.3.1 New Emergency I)lesel Generator llullding The new EDGs are to be permanently installed in a reinforced concrete building that will be located in the plant's north parking lot. The building will be within the plant's main security area; however, it will not be connected to the main power block (see Figure 3). It will be seismically designed in accordance with RG 1.76. The systems for each EDO will be physically separated and designed for, or protected from, external phenomena, such as fire, Dood, tornado, and tornado missiles. The equipment will also be protected from internal hazards. such as internally generated missiles.
The new EDO building will be designed using applicable design criteria. A new seismic response spectra will be created for the building in accordance wF Standard Review Plan 3.7.2.
The building res1xmse spectra will be utilized to perform seismic qualification of the equipment inside the building.
Non-safety.related systems and components located in seismic Class 1 structures are required to be designed as seismic Category 11/1 because these systems and components are not required to remain operable during or following a Safe Shutdown Earthquake (SSE). Ilowever, they must be prevented from deflecting onto or damaging safety-related systems and components in their vicinity.
2.3.2 Mechanical Modifications Buel Oil Transfer and Storage Systy_na The fuel oil storage and transfer system will be designed to provide an independent source of fuel oil to each EDO with provisions for cross connecting the systerns. The required fuel oil storage tanks will be sized for at least a seven day supply assuming the EDG is operating at the maximum fuel consumption rate. The day tank will be located inside the new diesel generator building. The storage tank may also be located in the new building, or it could be located separately.
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e NITAC[lMENT EMERGENCY IllESEl, Gl NEl(ATOl(S e
jleting. Ventilation and Air Conditioningfystem fin %Q I
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This system is needed to mahitain the required design temperature of the i
EDG building. electrical equipment room, and battery room. The llVAC systems will be designed to maintain the interior temperatures of the various tooms within the following maximums and minimums: battery room (101"F -
69"F]F 50"F), all other rooms (120 F 40"F). Systems required 40"F), diesel generator operating bay i
(120' safety related equipment operation will be safety related. 'the battery room i
llVAC will also be designed to prevent a potentially explosive buildup of i
j i-Wastp_Qil Systetu r
'the waste oil system will collect waste water and waste oil from the new EDO f
building. This effluent will be treated as waste oil. The system will be capable i
of processing (processing includes separating the water and sludge from the oil) all the waste oil that could reasonably be expected to be generated.1he system will provide a means for emptying the collection tank and will consist i
of various components such as waste oil collection tanks, interceptors,
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distribution system and sump pumps. The existing system will not be used for this addition, nor will the existmg and new systems be tied together.
Demineralized Water System
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i This system will consist of a distribution system for deminerabred water which will be obtained from the existmg plant system. This system provides a means for refilling and flushing the radiator and provides en appropriate source of
- water for maintenance activities. It will be capatile of allowing chemical l
tidditions to be made to water intended for the radiator without introducing the chemicals back into the water storage tank. This system will also provide i
a means for replenishing any loss of jacket water for the EDG during testing and operation.
Fire Protection System r
The primary objective for the fire protection system is to minimize both the l
probability and consequences oll fires, 'this will be accomplished by the separation of areas with Gre rated barriers, detection equipment in all rooms, and automatic fire suppression systems in appropriate areas. This system will
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consist of a water sprmkler syrtem, a closed head pre action sprinkler system, i
a water sprinkler system for fuel oil storage tanks, and fire detection and
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control panels tied into the existing fire detection and protection system.
Modi 0 cations to the existing system willinclude the extension of the yard fire i
protection system includ%g shutoff valves, new post indicator valves, and new hydrants as required, t
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NIEC!l311MI 131EltGENCY lill;SEL GENI:lt4TOltS Sli!11}MAI Syh1G1 L
Each EDG will be provided with an independent air statting system. 'lhe system consists of air comptessois and four acceiver tanks which are capable of starting the !!DG.
Ernire Wa.in The existing service water system v,ill be modified to allow the No.12 !!DO to be cooled by service water supplied by any of the four service water trains after realignment of Nos.11 and 21 IIDGs. Additionally, the system will be able to withstand a single failure in accordance with UlSAR commitments.
23.3 Electrical Modifications Each of the two new liDGs will be aligned with a 4KV engincered safety features bus. 'lhe safety function c,f the system is to provide on site standby electrical power sources for safety telated loads icquired to mitigate the effects of an accident tombined with a loss of of%ite power. A second safety function is to supply power to the tequired safety related loads on loss of of fsite power not accompanied by an accident. 'the safety related systems will have sufficient independence and redundancy to perform their safety related functions assuming a single failure. 'lhe systems will be composed of two identical redundant traint (or channels), either train adequate to satisfy all engineered safety featm es demands.
Each EDG will be aligned with its 4KV enginected safety features bus an/
supplied from safety related, dedicated rnotor control center, battery. '
charger, inverter, and associated AC and DC distribution panch voltage AC system may not be required). "lhe motor control cent.r and distribution panels will also be aligned with the safety-related bus. No cross connection is permitted between the EDO supplies. The auxiliary systems will be designed so that a failure of either system or one of its auxiliary systems cannot impair the safety function of the electrical / control systems of the other I!DG.
The systems shall be sited to handle all safety related loads that are connected to them, plus any additional non safety-related load that may be connected to them. All electrical and control equipment will be sized to withstand a short circuit and be manufactured and tested in accordance with related ANSI. NEMA, and liiEE Standaids. The systems will be able to start and accelerate a number of large motor loads without system voltage dropping to a level that will degrade the performance of any of the loads below their minimum requirements.
The systems will be designed for surveillance or post maintenance testing while the plant is in operation. Each system will be started, synchronl fed, and loaded without interfeiing with normal operation. During testing, a Safety injection Actuation Signal (SlAS) or an undervoltage signal will override the test sequence and prepare the EDG for emergency operation.
XD3OlMMI l
INEltGENCY lilESEL Gl NEllATOltS j
Conttol Svucm Adequste instrumentation will be provided to monitor variables of the f
systems over their ope ating ranges during normal operation, anticipated i
operatioe surrences, and design basis accidents. Appropriate manual and automa
.introls will be provided to maintain these variables and the systerns wanin their prescribed operating ranges. Provisions will be made for controlling the EDGs both from the Control floom and locally, Current and voltage will be rnonitored locally as well as in the Control lloom.
l 4KV An3]Ilarv Electrical System
'"he modi 0 cations to this system will include the tie in for the EDGs to the l
existing 4KV safety related buses as shown on Figure 2. The affected brenter e
contro,s and disconnect switch interlocks will also need to be modified. Metal clad switchgear will be used for the EDO building power distribution system.
I which will be tied into the existing Class 1E power distribution system.
4 ROV AC Auxiliary Electrical System For each new EDO, a 4.16KV/480V transformer and 480V motor control center will provide power supply for 480V AC motors and for various auxilinty loads rated 480V, Each existing EDO is provided with its own 480V 1
AC motor contial center to supply power to its auxiliaries. 'ihis system will be modified to realign the 480\\ power supply.
125V DC Power System.
For each new EDO, a 125V battery is sequired to provide DC power to the i
EDO Gashing and its associated equipment and devices during normal and emergency conditions. A 125V battery charger is required with floating charge ability for restoring the battery from the design minimum charge to the fully charged state within 24 hours2.777778e-4 days <br />0.00667 hours <br />3.968254e-5 weeks <br />9.132e-6 months <br /> under any plant operating conditions. The system will also include a battery monitor to detect the loss of battery asailability. Additional modifications will realign the existing 125V DC power supply for the 4kV breaker controls and EDG engine controls.
MOV VitalInstrument AC_Systent(if requitol) i This system is needed to supply uninterruptable AC power reliability. The
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system will include an inverter with a manual transfer switch, a 120V AC distribution panel, and a 480V/120V static voltage regulator transformer as an alternate source to 120V AC distribution panel. Modi 0 cations are also required to the existing 120V AC instrument power supply for the EDO bearing temperature detectors as a result of the realignment of the existing i
EDGs.
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l:MI:l(Gl:N(T l)lESI:1, Gl N!:ltNIOl(S 2.3.4 Oths r Modifications hhin CotttJplit.eii1LMcMirituna A new l!DG and service water control panel will be designed for the nuiin control mom. It will allow los remote control, indications and annunciation.
If new control boards ptove to be impsactical or unnecessary, the existing control toora panels (IC17, IClH, IC19, IC20, and IC24) may be modified.
Any modification to existing control panels will be scismically analyicd. 'the control boaid modilications will include a human f actors analysis for panel layouts. *lhe existing Enginected Safety Features Actuation Sptem will be modified to suppoit the automatic starting of the new liDGs, and realignment of the existing !!DGs. The adequacy of the control mom IIVAC will be confirmed to ensure the control room environment is maintained within acceptable bounds.
OmundingSntrjn
'ihis splem will mnsist of a ground grid to provide protection for personnel and equipment under all conditions and to include novisions for the design of equipment pounding. 'the sptem will be tiet into the existing plant grounding splem.
CitdE c PrUltu!!tufyhlta li lhis sptem will piovide protection to all steel and cast iron surfaces in contact with soil, such as tants and busied pipes. *lhis system will be designed with sufficient capacity to support the plant yard inodifications as well.
l J'lant Access.jiulreilljmmansdtrue ty Sntem
'this sptem will provide security features foi the new !!DG building. 'the splem will be tied into the existing plant access, surveillance, and security sptem. Cuid acadets and estesior lighting will be designed in accoidance with existing specifications. Temporary security measmes will be provided as needed during the construction phase of the pmject.
Plant security modifications, including the new perimeter fencing outside the new I!DG building, will be installed prior to the new IIDGs becoming operational.
I'lanLCumumuitatin!LSn!cm
'this system will piovide paging and voice communication functions during all phases of unit operation on and off the plant site. 'Ihe splem design will take mio account the high noise level anticipated during operation of the new EDGs. 'lhe system will be tied into the existing plant communication system, 7
6ILACilMIXi' EMI:l(Gl:NCY lill;SICl, GENEl(NIOllS i
lEhtni.011'M!EE!!!!ILSplem 1.ightning protection equipment for the new EDO building will limit the voltage surge (som a lightning strike to a safe value and provide a path to ground for the dissipation of the energy of the lightning surge.
I'limt YNd Ara lixisting yard utilities in the vicinity of the plant's north paiking lot will be modified to suit the construction of the lido building. In addition, new undergiound utilities will support the added c(uipment, facilities, and services by linking the new 11D0 building with tie existing power block buildings.
An electrical and control ductbank will be installed underground to route electrical and control cables between the new EDO building and the power block. 'the separation criteria for the existing Calvert Clif fs plant will be used for the duct bank.
This wor k includes the design of any modifications to the existing mad sptem to facilitate consttuction; performing an analysis of the suriounding hill and its ictaining wall to eveluate the impact of a seismic event; modification of the intaining wall, if necessary; relocation of yard lighting; and modification of existing yard components affected by the' constiuction, llelocation of the existing well water supply lines and storm dialnage lines will be necessary.
To accommodate changes in the north parking lot area, an evaluation of the plant yard drainage system will be conducted. In addition, piovisions will be meluded for iun of fietention during tL construction phase. This willinclude the control of sedimentation and erosion in order to meet environmental impact iequirements. The change will consider the relocation of the existing yard storm water drainage during construction.
3.0 IECllNICAl, IWQUILEhll:NTS 3.1 Q1L&lTY ASSUl(AhC)LitDJilMM The design work performed for this project will be done in confoimance with 10 CFil 50, Appendix 11. The new building will be designed using for, the most part, current revisions of the appropriate codes and standards.
The power block modifications and duct bank will conform to the associated ANSI standards as currently listed in the Calvert Cliffs UFSAll Section 111. In addition to the new building design beir; accomplished in conformance to 10 CFil 50, Appendix 11; the requirements delineated in the following American National Standards Institute
( ANSI) standards, but not limited to these listed, will be addressed as required in the Quality Assurance program.
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l NOAtllMis 17.hll:ltGl:NCY lill:Sl:1, Gl:NI:ltNI'OltS ANSI N45.2.9 ANSI N45.2.11 ANSI N45.2.12 ANSI N45.2.13 ANSI N45.2.21 The extent to which the individual requirements of these standards apply will depend on the nature and # ope of the activity to be peilooned and the itupottance of the item or service iwolved.
3,2
[JANSIUCNi]ON Of COBjllhjb"BMJLFYSijalS Certain components and systems of the nuclear plant nie safety related because they assure the intcpity of the reactor coolant pressure boundary, assure the capability to shut down the reactor and maintain it in a safe condition, or assure the capability to prevent of Initigate the consequences of accidents which could result in potential olisite exposuies comparable to the guidelines of 10 Cillt 100.
The pmpose of this section is to provide a desciiption of the classification of systems and components which might be used during the design and manufacture of these components. 'lhese classifications will be applied according to the impoitance of the item in providing seasonable assmance that the added facility can be operated without undue risk to the health and safety of the public. Typical classification categories ate addressed below.
3.2.1 Scismic Claullicatlun Seismic classification criteria are set forth in 10 CI'll 100 and supplemented by llegulatoty Guide 1.29 In accordance with IlG&li practice at Calvert Cliffs, all equipment in sooms containing safetprelated equipment is to be seismically supported. Seismic Category I designates equipment that must remain functional during and after a seismic event. Seismic Category 11/1 designates equipment that does not need to function during or after a seismic event but must be scismically suppoited to preclude it falling on salety-iclated equipment.
3.2.2 System Quality Group Classification Components are classified according to their importance to safety, as dictated by service and functional requitements and the consequences of their failure.
- lhe quality gioup classification and code requirements will meet the intent of llegulatory Guide 1.26.
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EllM.'UMEIST EMEltGENCY I)lESEl, GENEltNIOl(S 3.3 M101CWILil, classillcKimM
'the plant structures and process systems are classified as Class I or Class 11 according to their function and the degree ofintegrity required to protect the public.
3.3.1 ClassI Class ! structures are those whose failure could increase the severity of the Design liasis Accident, cause release of radioactivity in excess of 10 CFit 1(X) limits, or those essential for safe shutdown and immediate or long term operation following a loss of coolant accident. The new I!DG building is classified as a Class 1 structure. '!he electrical underground dtu tbanks carrying power and control cables from the !!DG are classified as a Class I system.
3.3.2 Class 11 Class 11 structures are those whose failure would not result in the release of significant radioactivity and would not prevent reactor shutdown. 'the failure of Class 11 structures, systems and equipment may interrupt power generation by the main generators, but not the Class lli liDGs. Class !! systems and equipment also include seismic Category 11/1 as defined in Section 3.1.1.
3.4 ansi.n!; SIGN 3.4.1 Piping MaterlaFMinimum Wall Thickness Piping snaterial will be appropriate for the application and will be in accordance with applicable codes and standards.
Design pressure and temperatures will be used to calculate minimum wall thickness for each site of pipe used. Calculation of wall thickness will be performed in accordance with applicable codes and standards.
3.4.2 I)esign Conditions
'!he maximum allowable internal pressure and temperature will include considerations for occasional loads and transients of pressure and temperature. The applicable code for piping systems has specific provisions for variations from normal operating conditions, if pressure or temperature exceed maximurn conditions, the specific conditions of the code will be used.
3.4.3 Insulation Piping and equipment may require insulation in order to protect against personnel hazard, excessive heat loss or frecting. Insulation installed as part of this project will be compatible with present site insulation practices to the maximum extent possible.
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KlECllMiiNI EMEltGENCY 1)lES'1 GEN 1'llATOllS 3.4.4 l'iping Analysis All piping will be analyzed for dead weight and thermal expansion and will be supported in a numner which keeps stress levels within the allowable stresses of the applicable codes and standards. Pipirq which is part of or inside a Seismic Category I structure will also be suppored to withstand seistnic loads during an carthquake.
4.0 1.lCENSING llEQJRillM!iN,lS 4.1 TECllNICAl, SPECII'ICATIONS The Technical Specifications will require modification to include the new liDGs in the licensing basis. Additionally, some support system Technical Specifications may also require changes to renect new physical arrangements or operating conditions.
Technical Specifications which may need to be modified inc.lude:
T.S. 3/4.3.2 ESFAS Instrumentation T.S. 3/4.3.3 Monitoring Instrumentation T.S. 3/4.4.10 Structural integrity T.S. 3/4.7.4 Service Water System T.S. 3/4.7.6 Contr01Itoom Ventilation System T.S. 3/4.7.10 Watertight Doors T.S. 3/4.7.11 Fire Suppression System T.S. 3/4.7.12 Penetiation Fite llatricts T.S. 3/4XI A.C. Sources T.S. 3/4 A2 Onsite Power Distribution System The timing of these Technical Specification amendment requests depends on the installation schedule. We have the option of going into a dual unit outage and completing the EDG hookup during that outage or, of connecting the EDGs (one at a time) during successive refueling outages. If we choose the first option, where the EDGs will be connected during a single outage, we anticipate sending in the supporting license amendment requests approximately one year before the outage. If we choose to connect the EDGs one at a time during successive refueling outages, an interim set of Technical Specifications will be required for operation duiing the period where only one of the new EDGs is booked up. The final set of Technical Specification amendments would be requer.ed to support the hookup of the second EDG. As above, we anticipate requesting these amendments approximately one year before they are needed.
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A'ITACllM ENT I
EMEltGENCY DIESEL GENEllATOllS 4
4.2 FINAL, SAFl!!Y ANALYSIS Ill?i' ORT f
Changes will be made to the UFSAll to reflect the changes to the plant from the addition of the EDOs. Sections which may be affected by these changes include:
Chapter 1 Plant Description, Site Plan f
Chapter 5 Structures, Other Structures t
Chapter SA Structural Design 13ases Chapter 7 Instrumentation and Control Chapter 8 Electrical Systems t
Chapter 9 Auxiliary Systems t
'Diese changes will be made by the first annual update following completion of the dieselinstallation.
4.3 OTilER 1,1 CENSING ISSUES l
As the design progresses, we may discover that deviations and exemptions from codes and standards used by the project are necessary. We will negotiate the al proval of these changes with the NRC. In some cases, the original codes and standards used for the construcilon of the plant may be appropriate, e.g.,in tie ins.
i 5.0 REl'EltENCl; i
(a) 1xtter from Mr. O. C. Creel (130&E) to NRC Document Control Desk, dated November 30,1990, Response to Station illackout Safety Evaluation e
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