ML18094B398
| ML18094B398 | |
| Person / Time | |
|---|---|
| Site: | Salem  |
| Issue date: | 03/26/1990 |
| From: | Labruna S Public Service Enterprise Group |
| To: | NRC OFFICE OF INFORMATION RESOURCES MANAGEMENT (IRM) |
| References | |
| NLR-N90053, NUDOCS 9004180093 | |
| Download: ML18094B398 (44) | |
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'.'I Public Service Electric and Gas Company Stanley LaBruna Public Service Electric and Gas Company P.O. Box 236, Hancocks Bridge, NJ 08038 609-339-4800 Vice President - Nuclear Operations March 26, 1990 NLR-N90053 LCR 89-07 United States Nuclear Regulatory Commission Document Control Desk Washington, D.C. 20555 Gentlemen:
RESPONSE TO REQUEST FOR ADDITIONAL INFORMATION 28 AND 125 VOLT BATTERY SERVICE TESTS SALEM GENERATING STATION UNIT NOS. 1 AND 2 FACILITY OPERATING LICENSE NOS. DPR-70 AND DPR-75 DOCKET NOS. 50-272 AND 50-311 Public Service Electric and Gas Company (PSE&G) hereby responds to your request for additional information dated February 9-, 1990. In summary, detailed descriptions of the design duty cycles for all 28 and 125 volt batteries have been included as an attachment to this letter. PSE&G will include a concise description of the battery design duty cycles in the UFSAR. Clarification has been provided concerning the basis for assumptions used to develop the design duty cycles and the treatment of inrush currents. Please do not hesitate to contact us if there are any questions regarding this submittal. Sincerely, Attachments
'I Document Control Desk 2 3-26-90 NLR-N90053 c Mr. J. c. Stone Licensing Project Manager - Salem Mr. T. Johnson Senior Resident Inspector Mr. w. T. Russell, Administrator Region I Mr. Kent Tosch, Chief New Jersey Department of Environmental Protection Division of Environmental Quality Bureau of Nuclear Engineering CN 415 Trenton, NJ 08625
NLR-N90053 ATTACHMENT 1 Question 1 Proposed changes to Specifications 4.8.2.3.2d and 4.8.2.5.2d state that the battery capacities are verified to be adequate to supply and maintain in an operable status all actual or simulated loads for the design duty cycle when the batteries are subjected to battery service tests. Provide a detailed description of the "design duty cycle" including a tabulation of all the continuous and momentary loads and their durations which occur during the design duty cycle. It should be noted that the current Salem Technical Specifications (including Bases) or updated FSAR apparently do not contain a description of the design duty cycle nor has one been proposed in this amendment request. It is the staff's position that a concise description of the design duty cycle should be included in either the plant's Technical Specifications or the updated FSAR.
Response
The design duty cycle, including a tabulation of all continuous and momentary loads and their durations, for all 28 and 125 volt batteries are provided in Attachment 2. PSE&G will include a concise description of the design duty cycle in the Salem Updated FSAR. Question 2 Attachment 4 to the October 17, 1989, amendment request contains information describing the criteria and methodology utilized to identify and calculate battery loads for the battery service test profiles. Assumption II.C in Attachment 4 states that the scenario is loss of AC power (offsite) coincident with a LOCA. Assumption II.D states that for 2 hours immediately following the start of the scenario battery chargers are not available. Assumption II.F states that 4160 volt vital loads obtain power from the diesel generators for the entire 2 hours. Assumption II.E states that during the 1-120 minute time interval offsite power becomes available and non-vital 4160 volt loads are manually reconnected to offsite power. In previous battery load calculations reviewed and approved by the staff, the most conservative approach taken by licensees was to wait until the 12lst minute (end of the scenario) before reconnecting loads (vital and non-vital) back to offsite power.
Provide technical justification for Assumption II.E as being the most conservative approach for adequate battery capacity sizing and service test profiles.
Response
The amendment request contained an Attachment 4, which provided a brief summary of the load profile methodology, assumptions/data and DC load evaluation criteria applicable to the 125 volt batteries only. This information was extracted from the 125 volt DC system study calculation and condensed, in some cases, to address the key elements. This condensation of information may have led to some confusion because the "rules", which were adhered to and provide clarification of the assumptions, were excluded from the amendment request. A complete list of the criteria utilized in establishing the 125 volt battery load profile, including the aforementioned rules, is provided in Attachment 3. The assumptions/data and basis of calculation applicable to the 28 volt batteries is provided in Attachment 4. The load profiles for the 125 volt batteries at Salem are developed to verify the capacity and capability in mitigating the consequences of a design basis event (DBE) under the following concurrent conditions.
- Loss of Coolant Accident
- A total loss of offsite power supplies.
- A complete loss of all battery chargers for (2) hours immediately following the coincident loss of AC power/LOCA event.
The criteria utilized in establishing the battery load profile is provided in Attachment 3. The battery load profile includes all the DC loads under the worst case duty requirement on the battery. The battery duty cycle considers the largest sequential DC transient load (less than one minute duration) required during restoration of offsite power to the group buses, as a continuous load for the entire duty cycle (1-120 minutes), refer to the discussions of Rule 11 in Attachment 3. The load profile includes the vital, essential and computer UPS loads for the first minute. Since the Emergency Diesel Generators (EDG) are available in (10) seconds following a loss of offsite power, these UPS loads would be supplied from the EDG and not be a load on the batteries (refer to the discussions of Rule 8 in Attachment 3). If the actual vital, essential and computer UPS operating loads are included in the duty cycle from 1-120 minutes and the group bus transient loads are taken randomly for (1) minute instead of the entire 1-120 minute time frame, there would not be any significant change in the battery profile. The actual specified battery capacity is much larger than the calculated capacity and provides substantial margin over the actual duty cycle requirement (refer to the load profiles provided in Attachment
- 2)
- Therefore, it may be concluded that the actual battery capacity and capability are adequate to meet DC load demands under all postulated plant operating conditions and the duty cycle used is conservative with respect to the actual battery duty.
Question 3 Assumption H in Attachment 4 states that no consideration was given to inrush currents associated with spring charging motors in circuit breakers or solenoid operated valves. In light of paragraph 4.2.3 of IEEE Std 485-1978, "IEEE Recommended Practice for Sizing Large Lead Storage Batteries for Generating Stations and Substations", which states that inrush currents are typical momentary loads to be considered in battery load profiles, provide justification for the apparent non-conservative approach of not considering inrush currents.
Response
The Salem batteries were designed prior to IEEE Std. 485-1978 formally being approved for release, and Salem is not specifically committed to the requirements of this standard. So, one minute breaker spring charging motor inrush current is not used to calculate the battery profiles. When a breaker operates, the spring charging motor will consume inrush current (for a few milliseconds) and then normal running current for the remainder of the running time (2-3 seconds). In the Salem calculation, inrush current is not utilized, but consumption of normal motor current from the battery has been considered for 60 seconds. The equivalent battery Ampere-Hours (AH) consumed by the motor for the assumed 60 second period is much larger than the equivalent AH actually consumed by the motor during the few milliseconds of inrush current followed by 2-3 seconds of normal running current. Thus, the calculated AH is more conservative and imposes more AH drain on the battery capacity than that actually consumed by the motors. Additionally, the actual one minute operating duty requirement of the 125 volt batteries never approaches the tested battery capacity and capability (refer to the battery profile/load profile diagram on each load profile sheet, Attachment 2). All breaker spring charging motors are fed from 125 volt batteries, so inrush currents associated with these loads are not applicable to the 28 volt batteries and are not included in the load profiles for these batteries. The ASCO solenoid valves supplied for DC service have no inrush current associated with their operation (refer to Attachment 5).
ATTACHMENT 2 A comparison of the calculated load profile and the specified load profile for the Salem 125 volt batteries is summarized below: UNIT 1 Time Interval PSE&G Specified Calculated Load (minutes) Load Capacity (amperes) (amperes) 1A 1B 1C 0-1 1825 659 749 749 1-120 735 303 310 337 UNIT 2 Time Interval PSE&G Specified Calculated Load (minutes) Load Capacity (amperes) (amperes) 2A 2B 2C 0-1 1825 679 709.43 712 1-120 735 261 278 288
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NOTES: Ill Rt.-ClllR !RIP llUI! II *.2 Q. It H tr ... v r.RP eus BIR , .. ll ~IF!iU 1--l.OAO IS NEGLIGIBLE f SCH 211J54-BL-4016 REV 91 ltllCSLElODIPI l ORIFIC[ !SDI. YI.VS 0.11 35 ¥Pl.V(S 2UIA,l I 24CVI~ 20 *u PU A[Ll(f. YL¥ ZPfll n tf UY CllP eus BUI '""ll~[ lBFGO 2-REC. BKR INTERLOCK.ED WITH E~RGENCY FEED BKR
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NEGLIGIBLE. LOAD IS
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7 (*?.l. lS AU"( Ht0114llll SYSll" 41 .,z STiii t001. VTR I SO US""4'\lJ<GSTSlSOl..Yl.YS WE VOL TS/CELL RECOVERS TO 1. '35VtCELL THEN DROPS n *n '""'COIL Ullll VTllVlYSCTl TO J.9JV/CELL OVER THE I-iZO !'!IN TI~ FEF!!CQ; n*rTUABl~TJlllPIBU! AT A LOAD OF 2~4H I SEE ATTACHf"ENT F PG4.J. n *u 'M con UNIT ONf'tJl'SCn
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PUBLIC SERVICE ELECTRIC &.GAS ., ; ii .. SALEM l & 2
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A comparison of the calculated load profile and the specified load profile for the Salem 28 volt batteries is summarized below: UNIT 1 Time Interval PSE&G Specified Calculated Load (minutes) Load Capacity . (amperes) (amperes) lA lB 0-1 365 176 114 1-60 295 147 98 60-120 225 123 88 UNIT 2 Time Interval PSE&G Specified . Calculated Load (minutes) Load 9apacity (amperes) (amperes) 2A 2B 0-1 365 182 116 1-60 295 149 100 60-120 225 127 89
EOR lNFORMATlON.* ONLY l~
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~--
~.
*!4 r*;x AWG--<'
CONT f<f.L LC'.;:::s Ci'-3 H.13-3 l J ~-4 ;,:1 LOtl[Jf, AMPS 0-1 l-(0 (.Ci-J?'.°I ___ I
-t-~J-=~~t~~
____ l f-~*IPS ll-5 ~:..!!__ 4. 1 3.5 13-5 -~~~._ __ 4,_~ ___ :::,_['_ l J --6 .__5. 9 4. 3 4. l 13-E. 5. :. .i:.-1 __ __ :3_~ 9 _. 11-7 7.2 6. l =.. 0 13-7 ~.. J ~- 0
-----*---- 4. 3 14-3 5. 9 5. 4 "!. 6 l f,-3 4. 7 4 *., *l. J l 4-4 5. 4 5. 0 4. 4 16-4 - - - -1 14-5 4. 7 3. 0 2. 6 16-5 14-f>
14-7
- 6. 0
- 6. 0
- 5. 0
- 4. 6
- 4. 4
- 4. 3 16-6 16-"f 4. 8
- 4. 3
-5.0 -
I
.... - - -J47 19-3 0.2 o. 2 o. 2 18-3 4.2 3.8 3. 2 NIS: HH RACI< 119 3. 6 2. 4 l. 5 J 8-4 3. 9 4. 3 4. 2 RELAY RACK l R 12 2.0 2. 0 2. 0 18-5 3. B 3. 7 3.3 -- ---+------1------- --*MHJU1ES PROCESS GROUP RACK 0. 7 0. 7 o. 7 PROCESS GROUP 3 RACK 41 b. l 5.22 5.22 l f>O l 20 INTERF CAB 32 6. 5 5. 7 5. 7 *1A PA SYS ALARMS 0. 2 0. 2 0 BATTERY PROFILE JADE PANEL UV/ALA~M 0.1 0. l O. l FIRE ALARM SYS PO~~R 4. l 2. 3 2. 3 lCDE PANEL UV/ALARM 0. l 0. l 0. l LOAD POOF ILE NOTES:
TOTAL: 73.0 60. 6 53.5 RCC REL C.=tB 0. l 0. l 0. l AUX RACK 58 1.7 l. ~J ~ 1-LO~D IS NEGLIGIBLE <SCH 211347 REV 7,203529 REV 61,
< DWG 211357 flEV 41 REF: SCH 211357-4, 2113~9-6, 211351 TOT AL: 77. 7 7 J. 3 64. 4 2-LOAD JS 25,15,5 AMPS <SCH 203525 REV 181
.~ - FROM T He.- 0 -1 111N TI HE p E R I OD, AT A LOAD or l 7 &A.THE VOL TAGE CROPS FROM 2V/CELL REV. N0.6 DATE 12-1 3-8~.
TO J.':.'JV/CELL. THEtl RECOVERS TO 1. ~2V/CELL ANO DROPS TO J.91'//CElL AT A ~ Oo\O OF 14 71) 0'1EF. THE 1-E.D MlN Tli"E PERlDD. THE VOLTAGE RECOVERS TO ). ~3 V/CcLL EBASCO SERVICES INCOEPORATED PUGLl C SERV1CE ELECTRJC & Ct'\S Af:D OF.OPS 10 l. SJ VICELL DURING THE E.0-120 MIN TIME PtRIOD AT A LQ,:,i) OF l 23A. :>IV.~C- OR.~~ f\PFF.OVED Sr'ILEM 1 & 2
- 2f:v DC Hf1TTEF.Y SL?l NG-4-DF;.:.1<rnG r;ur-1sc.Rs AUER TO KEY DRAWINGS WHICH LIST SCHEMATJCS or IN~!V]QiJrli.. QATE~! -68 Cff.Of*Sa -*--
Clf\CUIT:;. --. ---- ON<:: LlNf: FOR SYSl~M l ,; ~~EET l - 0 0 f SCALE NON<:
~--.....--...._
I
.EOR .INEORMATIO'N O*NLY
~* *. ,:
t IA TT AC HME NT 1-B2 TYPICAL CONTROL POWER DISTRIBUTION FOR RELAY CABINETS
~DOA~
M!tl AMPS Prep:;red By :i;;rs-
- 4. 9
- 4. 9
- 4. 3
- 4. 3 17-4 17-5
.. 2
.. 2
- 5. 3
- 4. 3
- 4. b 3.:.
I F.c'Ji:;wed fly fr C:a1a I If /J'~ I
- 4. 5 4. 1 17-6 2. 3 4. 3 2. 9 lI:~
295
- 4. 9 4. 5 17-7 o. . 0. 7 o. 7 15-3 15-4
- 4. 7 5.7
- 4. 1
- 4. 7 3.6
- 4. 4 TUR2INE DRAIN VLV POS IND PROCESS GP 4 INTRF RK 51
- 0. 2
- 3. 8 I
- 0. 2 2.9
- o. 2
- 2. 9 l!i _, I 225 15-5 E.. 2 5. 1 4. 3 A~X CONT REL CAB RClB-6 ~- l 4. 1 3. 9
-=- .. LOOSE PARTS MONITORING 15-6 15-7 19-3 PROCESS GP2 lNTRF RACK 57 ROD CONTROL INTERFACE
- 5. 9
- s. b 4. 8
- 0. 2 5.9 1.6
- s. 9
- o. 3
- 4. '1
- 5. 0
- 4. 7
- 0. 3 1--4~*~4~__:.:....:.--1-~~-li.-NOTE
- 4. 1
- 1. 4
- 5. 7
- 4. 4
- 3. 8
- 1. 3
- 5. 7 INTERFACE CAB *38 TRAIN '8"....._E.""'.'-'5'--1--"--+""""'-'---i ALlX CONT REL CAB 2
RC18-7 STM DUMP CONT MODE & INTRK TK
!DOE PANEL UV ALARM TOTAL
- 4. 8
- 0. b
- o. l 3.. 4 3.~
- 0. 4
- 0. 1
- 31. .
- 3. 3
- o. 4
- 0. 1
- 27. 3 L ~L ---~
l .0
- -- ~~ ---1 "'""TES 120 BATTERY PROrILE - - -
- i 1 BOE PANEL UV ALARM 0. 1 0.1 0.1 LOAD. PROF I!.~
TOTAL 77.3 6E..9 E1.0 1-LOAO IS NEGLIGIBLE ISCH 211348 REV 7.203529 REV E.l,IDWG 211357 REV 41 REF:SCH 211357B9511-4,211348B9483-9 2-LOAD IS MAXIMUM ACCEPTABLE LOAD. 211350B9511-E.,211358B9511-2 3-FROM THE 0-1 MIN TIME PERIOD, AT A LOAD OF 114A, 7HE VOLTAGE DROPS FROM 2V/CELL REV. N0.2 DATE 12-23-88 TO l.94V/CELL, THEN RECOVERS TO 1.945V/CELL AND DROPS TO l.94V/CELL AT A LOAD OF :!BA OVER THE 1-.D MIN TIME PERIOD. THE VOLTAGE RECOVERS TO l. 945 V/CELL EBASCO SERVICES INCORPORATED PUBLIC SERVICE ELECTRIC & GAS AND DROPS TO l.94V/CELL DURING THE E.0-120 MIN TIME PER100 Al A LOAD OF BBA. DIV. ELEC OR,ROR SALEM l & 2 APPROVED 4-0i'IAWING NUMBERS REFER TO KEY DRAWINGS. WHICH LIST SCHEMATICS OF INDIVIDUAL 28V DC BATTERY Sl2JNG-CIRCUITS. SHEET) OF) SCALE NONE I I ONE LINE FOR SYSTEM JB
-I...
9 I JNCl"ES '*-----.-.!- ---'----
- (
.EOR INFORM.ATION O*NLY ATTACHMENT 2-A2 BATTERY= TOTAL AtfS
-=-
2A kCU-21 0-1 1-60 £.0-120 HIN 182.2 149.6 127. 7 STATUS SPDS
~BATTERY 2Al ~~R~~~ 211347 GROUND O~~T~~~~~~ 347 LV RELAY
?.BATlERY 2A2 CHARGER OWG NO. 211347 l 28VDC I . -- I 2 BkO ZBKO TYPICAL CONTROL PNL 2RP4 RACK A w.. _.... l VOL TM POWER DISTRIBUTION owe NO zo3s2s owe N9* t.0oe 91 ~* owe NO. 203s3a )15A FNDTE 2 17"NOTE 1
- 1 )NON- .* .* I* NOTE l
- 2 ) NON-
*J4 AWG FOR RELAY CABINETS 4Q0A *9 )5oA *11) AUTO *7)15A *10)15A *e)15A AUTO 2A-2BVDC BUS D NO. 11347 AUX CONT RELAY CAB RC-C TYPI
- o. 5
*J ) !DOA RUNNING LOADS AMPS
*5 ) !OOA RUNNING LOADS AMPS 2~gA j)2 I TYPI
)3 ~ubfte lervice Electri: & G 0-1 1-60 60-120 MIN *2 AWG 0-1 1-60 60-120 HIN 75L9 62.4 56. 9 81. 3 72. 4 65. 8 IRS Unls 1 at;I 2 2AD~-28VDC CONTROL BUS 2CDE-28VDC CONTROL BUS 1 L.:...~---:Tttol"rcno~NThRUOttLii~~""~~.i.-fi'~IJQ-l.FJJll~llf~
DWG N0.220804 owe N0.220806
) l5A c TYP FOR EACH LOADI S*C-EOOD*EDC*01E9*C r RUNNING
) 15A I TYP FOR EACH LOAD>
I' RUNNING
*14 AWG=:<J> LOADS o-~ 0 ~0-5,o~~-120 HIN *1"4 AWG=j LOADS o-~O~D_s6t~~-120 HIN AMPS I AUX CONT REL CAB RC21-3 7. 7 (o.3 (0.0 I AUX CONT REL CAB RC23-3 I 6.2 s. 1 4. 6 21-4 7.1 6. 0 5. 5 23-4 6.9 s. 2 4. 9 365 Prepared lly f;) S
- Date*~~
21-s 4. 4 4. 7 4.1 23-5 6.0 4.3 3. 8 21-6 r.. 3 4.3 4.1 23-i s. 3 4. 0 3. 8 Date 1/~/n 21-7 7.1 s. 8 4. a 23-7 s... 5.0 4. 3 24-3 6.6 S.1 4... 26-3 s. 6 "1. 7 "4.0 2"4-4 3. s 3. 4 3. 3 26-4 2. 9 3. r. 3 ... -- , 182.. 2"4-S 1. 95 4. 32 4. 02 26-5 4. 7 ... 6 "1. l I r..o s. r. 2"4-i s.o 26-6 5. "1 5 ... 4. 3 2"4-7 r.. 3 S.2 ... 9 2&-7 s. r. s. s 5. 0 - - - -J-49
.. 29-2 0.0 0. 72 0. 72 51" 1111' C1l 1111 I JlllU 11 'A' 2. 0 1. s 1. 4 I
I 127 POllER RANGE REC HR 45 SUECTJOH HlHIC BUS PROCESS GP INTERFACE Rl\CJ. 93
- 3. r.
2.0
- 0. 74 2 ...
- 2. 0
- 0. 74 1.
2.0 s
- o. 74 l'lllUSS " 3 JllElf ta RACI 41 AUX CONT REL CAB RC 28-3 AUX CONT REL CAB RC 28-4 B. l
- 4. 2
- 3. 9
- 7. 1
- 3. 8 "1. 3
- 7. 1
- 3. 2
- 4. 2
-t-~--t~~~~-r-~~~~+-HINUTES l
E.O 120 I .
- r.. s s. 7 I
INTERFACE CAB *JZ TRAIN 'A' 5. 7 FIRE ALARH SYSTEH POWER "1. 1 2. 2 2. 2 BATTERY PROFILE*-- Ill. 2ADE PANEL UV ALARH 0.1 0.1 0.1 *2 PA SYSTEH SIGNAL ALARMS o. 2 D. 2 0 ~5 TOTAl.1 15.9 62.... sr.. 9 AUX CONT REL CAB RC 28-5 2CDE PANEL UV ALARM
- 4. 7
- o. 1
- s. 8 0.1
- 5. "1
- 0. 1 LOAD PROFILE NOTES: ~
1-LOAO IS NEGLIGIBLE ISCH 211347 REY 7,203538 REV 181. TOTAL: 8J.3 72.4 £.5.8 ~ IDWG 211357 REV "41 REFrSCH 211357-4,211347-6,220804-3,22080£.-31 2-LOAO IS 25, 15, 5 AMPS c SCH 203525 REV 181 REV. N0.1 DATE 12-12-88 ; 3-FROH THE 0-1 HIN 1H£ PERIOD, Al A LOAD OF 182A. THE VOLTAGE DROPS FROM 2VICELL r.::~~~~~~-:"""".""~~~~,-----;.;,;;;..-,_;.;.;;.;..:.._..:;:;;.:.:.:.....,,.:.:;;...;;.:;....;;.;~ TO J. 91 V/CELL, THEN RECOVERS TO 1. 92V/CELL AND DROPS TO 1. 91 V/CELL AT A LOAD EBASCO SERVICES INCORPORATED PUBLIC SERVICE ELECTRIC & GAS It OF 149A OVER THE 1-60 MIN TIME PERIOD. THE VOLTAGE RECOVERS TO 1.93 V/CELL AND DROPS TO I. 91 V/CELL DURING THE £.0-120 HIN TIME PERIOD AT A L DAD OF 127A. DIV, ELEC DR.ROR APPROVED SALEM ] & 2
'4-DRAWING NUt-sERS REFER TO KEY DRAWINGS WHICH LIST SCHEMATICS OF INDIV1DUAL TE CH.DPS,ar-------1 2BV DC BATTERY SIZING* .
CIRCUITS. SCALE NONE ONE LI NE FOR SYSTEM 2A 1£ET l OF) I I 2 IK:HES 11 ' . ' ' '! '
- 11 IJllll~
I I CM. !
t. fO:R INFORM_ATlOl't_. O*NLY t 2-B2
- 3ATTERY = TOTAL AMPS
)ATTACHMENT e.cv-211-!, ,._ ,
YB"'"' 23 ::=: 11l - l I - 611l 611l-120 MIN ~BATTER'CHARGER GROO'D O:::TECTION C:--i'iRG:O:=! 28VOC 1,,,., : 89.5 I OWG N0.2113~~ DWG N0.211348
;:;pos RACK 'B' I* 2'3K. 29K.
"""~ ~ DWG NO. 203:;::;9 UV R:::!..AY
- g. VOL TM OwG N0.21i348 I )15A TY?JCAL COtlTROL POWER DISTRIBUTION I
r.--NDTE 1
- 1)NON-AUTO . : 5A r I* NOE I
- 2 ) ~~~J
- J .!
--1 FOR RELAY CABINETS
*7 J
- 111l ) J 5A
- 8 \j ! -:>A AWG
.:0~-r *"! )
- - 23*28VDC BUS I ~ lo*.io N0.2! 1348 l I
- 1 r AUX CONTiRELAY CAB RC*<TYPl j r - I - 11l.51 10 JZ u::
*3) 10t3A RUNNING
- 5 ) 1130A RUNNING )3 \. ) 11
*2 "l\IG-*l LOADS AMPS 11l*l 1*50 60-12~ MIN
~ 75. 4 I 66 7 I 61.0 I
*2 AWG-IJ LOADS AMPS 0-1 1-63 611l- !211l ~!N l-o---1 37.8 I'.-'".::' 28.3 I "j
< TYP ~
J ~;:t:: & ~c 29DE*28VOC CONTROL BUS OWG N0.2211l805 T 2DDE*28VDC CONTROL BUS OWG N0.220807 TO CONTRO RE~AY CGIL3-LIGHTS.~
) 15A <TYP FOR EACH LOAD> ) J 5A ( TYP FOR EACH LOAD l Cz!culation Ha. s.c.EJJDl.EJE.0129-0 1
*14 AWG -! *,
AUX CONT REL CAB RC22-3 LOADS 1 RUNNING LOADS AMPS 0-1 *I *50 60-1211l MIN 6.8 5.3 5.6
- 14 AWG-i
; AUX CONT REL CAB RC27-3 I o.B LOADS RUNN!f-<3 LOADS A:~?S 0-1 1-60 60-120 MIN
- ..3 I 5 ~..:..
AM 0 S S-c-mDl*m&-0169-0 22-4 5.7 4.q 4.3 27-4 6.2 5.3 I 4.6 365 - 22-5 6.6 6.5 4.9 4.5 4.2 4.2 j 27*5 6.6 4.7 I 3.3 4.6 i 3.0 Prepared By D:s Date 1 ~b-/SJ - 22-6 22-7 25-3 5.1 5.0 4.3 4.3 4.0 3.7 TURB DRAIN VALVE POS IND 27-6 27-7
- 2. 7 0."l 0.2 I. 2 I I. 2 111.2 I e.2 295 Revie*Ne~ By l ??'\
Datel/;1/J'y 25*4 6.3 5.4 5. l PilOCES5 GROUP ~ INTERFACE RACK 0 51 3.8 2.'l I 2. "! -'16 25-5 6.2 5.2 4.4 AUX ~ONT REL CAB RC 28*6 5. 1 4. 1 I 3.°l I I 25*5 5,q 6. l 5.2 AUX CONT REL CAB RC 2B*7 4.8 I 3.q i 3.3 I 100
---------1 25-7 5.6 4.8 4.7 STH llJf' CTL Hll!': & INTLK TR '8' 0.6 111. 4 I 0.4 ! I 0.2 li!!.3 LOOSE PARTS MONITORING PROCESS GP-2 INTERFACE RACK 57 2'l-3 5,q 0.3 4.4
... l 4.4 -NOTE 2 3.8 200E PANEL UV ALARM 0.1 TOTAL* 37.8 33 l 0.1 I 0.1 23.5 i
I I ae
~--------
MINUTES ROD CONTROL INTERFACE 1.6 I. .. l. 3 I 60 120 INTERFACE CAB *38 TRAIN '8' 6.5 5.7 5.7 BATTERY PROFILE - - - 290E PANEL UV ALARM Ii!!. l 0.1 0.J LOAD PROFILE - - -- - TDTALz 78.4 66.7 6l.11l ~ NOTES* I -LOAD JS NEGL IGIBL:O <SCH 211347 REV 7.203538 REV 7l,
<OWG 211357 REV 4l 2-THE LOAD INFORMATIONS UNAVAILABLE. THE LOAD USED IS REF:SCH 211357-4.2!1347-8.220B05-5.2211l807-I THE CACULATED VALUE. FOR LOOSE PARTS MONITORING 18. REV. NO. 1 3-FROM THE 0-1 MIN TIME PERIOD. AT A LOAD OF 116A.THE VOLTAGE DROPS FROM 2V/CELL DATE 12-12-88 TO 1.'HV/CELL. THEN RECOVERS TO l.q45V/CELL ANO DROPS TD I. 'HV/CELL AT A LOAD EBASCO SERVICES INCORPORATED PUBLIC SERVICE ELECTRIC & GAS OF 111ll1lA OVER THE 1-60 MIN TIME PERIOD. THE VOLTAGE RECOVERS TO I. 945 V/CELL AND DROPS TO l.'l4V/CELL DURING THE 60-1211l MIN TIME PERIOD AT A LOAD OF 89A. D!V.ELEC OR.~ APPROVED SALEM 1 & 2 4-~RAWING NUMBERS REFER TO KEY DRAWINGS WHICH LIST SCHEMATICS OF IND! VIOUAL OAT!i IZ.-i5-t~CH.~ 28V DC BATTERY SIZING-CIRCUITS. SCALE NONE ONE LINE FOR SYSTEM 28 lsHEET 1 OFl I I
- I > _,_I
ATTACHMENT 3 I By: J).S Date: r2*J¢- gs- Sheet. 1: o: _,
}~ e e Checked: Date: i..:.. . .J; PSE&G SALEM NUCLEAR GENERATING STATION UNITS NO. 1 AND 2 125VDC SYSTEM STUDY CALCULATION NO. S-C-EOOO-EDC-0129-0 3.0 CALCULATION 3.1 DC Load Evaluation Criteria There are six (6) 125 VDC batteries asso~iated with the Salem Nuclear Generating Station. Batteries lA, lB and lC provide the*necessary DC power to Unit 1 and batteries 2A, 2B and 2C deliver this power to Unit 2. It is the purpose of this calculation to determine the load each of these six batteries must supply to safely shutdown their respective units following the worst case postulat~d accident.
An engineering assessment of the -load for each of the batteries is to be made based primarily upon a review of the drawings associated with each of the various circuits connected to the batteries. For this purpose, the following accident scenario has been chosen; a unit
~
undergoes a coincident loss of off site power (LOP) and a large break Loss of Coolant Accident (LOCA) while both of the battery chargers associated with each battery are out of service for two hours. It is assumed that at the inception of the accident, the batteries are fully charged. According to the statement made in SGS-UFSAR, Rev. 6, 2/15/87 Section no. 5.3.2.2, page no. 8.3-12 (last paragraph), the PSE&G commitment is to size batteries in support of a loss of AC power (i.e. loss of offsite power for tw~ consecutive hours). However,.all other analyzed design scenarios described 256lv
By: £!5_ Date: /2-!3*8t Sheet 13 of 71. Checked: -~l'.L;...*-..*- Date: _.: JI r
- PSE&G SALEM NUCLEAR GENERATING STATION UNITS NO. l AND 2 l25VDC SYSTEM STUDY CALCUIATION NO. S-C-EOOO-EDC-0129-0 in Chapter 15 of SGS-UFSA will be mitigated by the active aupport of all three diesel generators beyond one minute including a single active failure for one vital battery system. This study is conducted to establish, conservatively, all possible loads that might be supported from the vital buses Wlder an Wllikely concurrent event of a LOP, a LOCA and a loss of all battery chargers (tmconwnitted operating condition) for two hours.
The two hour time period is divided into two segments. The first segment is the time between inception of the postulated accident and the first minute (0-1 minute). This time period is critical since many automatic systems will respond to the accident situation. The second time interval (1-120 minutes) identifies the time to aafely shutdown the plant. During the 1-120 minute time interval for the purposes of this calculation, a return of offsite power is anticipated allowing the operator, as required, to restore power manually to the group buses. 3.l.II First Minute Time - Sequence Analysis During the first minute of this postulated LOP/LOCA accident, certain automatic operations are initiated. The group bus main circuit breakers are tripped. The breakers connecting the Reactor Coolant Pump to these four buses 256lv
By:DS Da t e : 12- J3 * ~ '? Sheet 14 of 7i.. Checked: __,,~kj'..-*--11~~ Date: ' .':
.)
PSE&G SALEM NUCLEAR GENERATING STATION UNITS NO. l AND 2 125VDC SYSTEM STI.JDY CALCULATION NO. S-C-EOOO-EDC-0129-0 are tripped. This happens within 30 seconds following the event. The main circuit breakers to the vital buses are tripped and most of the feeder breakers from these vital buses are tripped. On examining the circuit breaker control schematics, it was discovered that this action was initiated by the Loss of AC power on the buses monitored by an undervoltage relay (Device 27). The following rules, therefore, were adhered to, as part of this "Engineering Criteria". Rule 1: If a contact, identified as a "27" device contact, is found in the opening/tripping circuit of a system component, this device is opened at the inception of the accident. Another automatic operation occurs during the first minute. The diesel generators, one for each vital bus, start up and ten (10) seconds into the accident, are connected to their respective vital buses. At that point, selected loads, necessary to aafely shutdown the plant, are reconnected to their vital bus by the closing of their feeder circuit breaker. On examining these circuit breaker *chematics, it was observed that two contacts identif ie~ by the term "SEC" (Sequencer) performed this operation. One of these "aequencer" contacts prevents any manual operation of the device while the other, which is located in the close circuit of the device, will initiate the 256lv
Date : I 2-13, 8 6 Checked: II Date: ;; :: J.J Sheet 15 of 7t.. PSE&G SALEM NUCLEAR GENERATING STATION UNITS NO. 1 AND 2 125VDC SYSTEM STUDY CALCULATION NO. S-C-EOOO-EDC-0129-0 closing back onto the bus at the proper point in time~ As the name "1equencer" implies, these loads are reconnected to the vital buses in sequence and the entire sequencing operation is completed thirty (30) seconds into the accident. Rule 2: Whenever a set of contacts, identified by "SEC", is found in the close circuit of a device, that device will be sequentially reconnected to its vital bus some time after the diesel generators are 1upplying the vital bus and before thirty seconds have elapsed. Rule 3: All sequencing activity occurs within the first minute of the accident. Rule 4: In determining the contribution to loads made by the initial tripping and successive re-closing of circuit breakers, a comparison will be made between the loads due to the initial tripping and the succeeding loads due to reclosing and charging. The larger of these two loads will be used as the load contributed by these breakers during the first minute time period. Many of the circuits obtaining power from the batteries consist of protectiv<:> 256lv
.. By:~Date: 12-13*88' Sheet 16 of ~u.
Checked: --r--wDate: .:- '-/J PSE&G SALEM NUCLEAR GENERATING STATION UNITS NO. l AND 2 125VDC SYSTEM STUDY CALCULATION NO. S-C-EOOO-EDC-0129-0 devices. On examining main generator isolation, it was discovered that when a LOCA occurs, the main generator is' isolated by tripping certain circuit breakers in the system. This is accomplished by a lock-out relay (86). Rule 5: When the LOCA occurs, the generators are isolated by lockout relays. If a contact identified by 86 is located in the tripping circuit of a device, that device will open at the onset of the accident. Other protection systems, however, show that they will contribute little to the load on the batteries during the accident. Transformer or bus differential protection, for example, will not operate since no faults occurs on the system as stipulated by* the scenario. Rule 6: Tripping or operations of circuit dedicated to protecting the* electrical system from faults, breaker failure, pole disagreement, etc. will not occur during the two hour period of interest in this study. Many of the circuits fed from the 125V batteries are operated when certain. system parameters (e.g., pressure, flow, temperature, etc.) fall or rise to certain set points. Ascertaining precisely when these systems would operate during the accident postulated, could not be made
- 256lv
By: P5 Date: 12 ~! Sheet li' of 74 Checked: Date : /1. - : :
- J J f
PSE&G SALEM NUCLEAR GENERATING STATION UNITS NO. 1 AND i 125VDC SYSTEM STUDY CALCULATION NO. S-C-EOOO-EDC-0129-0 Rule 7: If a circuit is operated by plant parameters (e.g. pressure, temperature, flow, etc.), and circuit review cannot determine which time period it is activated, it is assumed to be activated during the first minute of the accident. The vital instrument bus inverters contain auctioneering circuits which monitor both the AC and DC sources. These instrument bus loads normally obtain their power from the vital AC buses. When a LOP occurs, the source of power for these vital instrument bus loads becomes the 125V battery. This continues until the vital buses are again energized. The auctioneering circuits will then switch the instrument bus loads back onto the AC vital buses. This will occur when the diesel generators restore power to the vital buses. Rule 8: Instrument bus inverters will contribute to the battery load for the first time period only (0-1 minute). 3.1.III (1-120 Minutes) Time Sequence Analysis During the second time period (1-120 minutes), most loads on the 125V batteries are the resultant of the actions and operations initiated during th~ first minute of the accident. In this calculation, any circuits which are 2561v
By: DS Date: 12,/J-'BS Sheet lS ~* , .. Checked: rk I Date : - * ,:
- i r' PSE&G SALEM NUCLEAR GENERATING STATION UNITS NO. 1 AND 2 12SVDC SYSTEM STUDY CALCULATION NO. S-C-EOOO-EDC-0129-0 activated by system parameters are assumed activated during the first minute (Rule 7); and these loads are conservatively assumed to remain as loads on the 125V batteries for the entire two hour period.
Rule 9: Any circuits activated by system parameters, in addition to contributing to the 0-1 minute load on the battery, will contribute to the 1-120 minute load. During the 1-120 minute time interval, initiation and subsequent circuit operations which may affect the load on the batteries other than changes in system parameters, will come primarily from manual operations. The "Recirculation Mode" phase of safety injection is one of these manual initiations. Rule 10: Activation of the Recirculation Mode of the Safety Injection System occurs during the 1-120 minute time interval and the load on the batteries due to this manual operation will be considered as continuous for the entire time interval. Another manually initiated operation considered in this calculation is the re-energization of the group buses when offsite power becomes available. The 256lv
By : ___.:;;'[)~5_....,._ Date: /2*/3
- S-~
Checked: l'"' I Date : / z. -;5
- Ji Sheet 19 of "
r' PSE&G SALEM NUCLEAR GENERATING STATION UNITS NO. 1 AND 2 12SVDC SYSTEM STUDY CALCULATION NO. S-C-EOOO-EDC-0129-0 load on the batteries due to the restoration of offsite ~ower (to the group buses only) is included in this load calculation because of the distinct possibility that offsite power will be once again available to the site during the 1-120 minute time interval and that if it is available, plant operators might use it. Upon examination it was seen that inclusion of the load on the batteries due to this possibility produced a conservative estimate of the load. Rule 11: Restoration of offsite power to the group buses occurs during the 1-120 minute time interval. The manual operations necessary to restore offsite power to the group buses are performed sequentially. A comparison of each of these sequential loads was made, and, because the exact time at which these manual operations takes place is variable, the largest sequential load on each of the unit's batteries was considered the battery's continuous load for the entire 1-120 minute time interva~ Rule 12: Manual operation is permitted in certain system circuits where it can be disabled. through circuit logic. Where circuit logic doesn't disable the manual action and engineering evaluation of the circuit has determined that the operation may occur, it has been assumed that the manual operation ** these minor components has taken place. The timing of this operation was assumed, conservatively, to occur in the first minute, unless it could be 256lv
By:~ Date: 12*1.3- &8 Sheet 20 of 7:... Checked: -r----Date: *2- *f
- I f PSE&G SALEM NUCLEAR GENERATING STATION UNITS NO. 1 AND 2 125VDC SYSTEM STUDY CALCULATION NO. S-C-EOOO-EDC-0129-0 determined by the circuit logic, that operation in the first minute was precluded.
3 .1. IV Evaluation of Loading Developed from the Time-Sequence Analysis The load on batteries 2A and lB were determined using the rules outlined in Sections II and III of this criteria. Each of the drawings associated with the various circuits obtaining their operating power from batteries were examined using engineering judgement and past experience, to determine when individual circuit components (e.g. r~lays, lights, etc.) are energized. From this drawing review certain general guidelines could be made for these circuit devices (i.e. when do they constitute a load on the batteries) and applied to the circuits supplied by all of the batteries. The resulting guidelines are as follows*:
- 1. Connected Load Due to Relays Minutes A. Cateaory 1 0-1 1-12.0.
x x Relay Relay Relay Load Designation ~ (Amperes) 74X,74DC,74-l,-2 **. DUNCO (*) 0.020 27X GE(HEA) 0.060 256lv
By : _Dc____,5,...---__ Date : 12 - I 3 - 8 tg' Sheet 21 Checked: )t: II Date: 14 -
- f - J !
of /;.,. PSE&G SALEM NUCLEAR GENERATING STATION UNITS *No. 1 AND 2 12SVDC SYSTEM STUDY CALCULATION NO. S-C-EOOO-EDC-0129-0 Minutes C~t~gQr:£ 1 (Cont'd) Q-1 1-120 x x Relay Relay Relay Load Desi&nation ~ (Amperes) 0-R DUNCO ("') 0.020 5X65XT DUN CO ("') 0.020 86BX, 86BDX, 86AUX GE (HGA) 0.034 X/86Gl, X/lDB, SG WEST. (SG) 0.027 MR DUNCO ("') 0.020
.72X, 72Y.A DUN CO ("') 0.020 94B DUN CO ("') 0.10 83-lB ITE (278) 0.16 27-1, -2; ... DUN CO ("') 0.020 3X DUNCO ("') 0.020 R DUNCO ("') 0.020 64X DUNCO ("') 0.020 65X DUN CO (*) 0.020 3-2A DUNCO (*) 0.020 TD-5 WEST. (TD-5) 0.18 52Z DUNCO ("') 0.020 20X DUN CO (*) 0.020 SG GE (SG) 0.027 6Z DUNCO (*), 0.020 256lv
By: DS Date: 12-1~-'88 Sheet 22 of 71.+ Checked: _,IL£-1!<1~*--11-.-Pate: > 5-!/ J l-' PSE&G SALEM NUCLEAR GENERATING STATION UNITS NO. 1 AND 2 125VDC SYSTEM STUDY CALCULATION NO. S-C-EOOO-EDC-0129-0 Minutes Category 1 (Cont'd) 0-1 1-120 x x Relay Relay Relay Load Desianation ~ (Amperes) 96/CIX DUN CO (*) 0.020 81X GE (HFA) 0.060 85 GE (CS26) 0.5 98B GE (HGA) 0.034
*DUNCO RELAYS ARE THREE TYPES: CAT. NO. 'S 219ABA152, 219BBX183 AND 255XCX129. THE CONTRIBUTION TO THE LOAD FROM ANY ONE OF THESE RELAYS IS 0.20 AMPERES.
The highest value of load (with the one exception of device 85 which is a special case consisting of static power line carrier equipment) is 0.18 amperes. For a conservative estimate this value will be used as the required operating current for all relays identified in this category. Minutes B. Cateiory 2 0-1 1-120 x This category is divided into two subcategories 2A and 2B. This is due to the 256lv
. By: lJ. S. Sheet 23 of 74 Checked: tM a
PSE&G
- SALEM NUCLEAR GENERATING STATION UNITS NO. 1 AND 2 125VDC SYSTEM STUDY CALCULATION NO. S-C-EOOO-EDC-0129-0 fact that these are two distinct loading values which fall under this operational category.
- a. Category 2A Relay Relay Relay Designation ~ 1&fill 52X-l DUN CO (*) 0.020 27X DUN CO (*) 0.020 A Square D, DC (**) 0.042 M Mtr. Str. (**) 0.79
*FOR NOTES SEE CATEGORY 1.
** The Square D motor starter is a special case and will be addressed separately when it is found due to the fact that there are so few DC motor starters. Including it in the evaluation of this category's loading value estimate would offset the value to an extreme.
The highest value of load current (excepting A&M components as indicated above) is 0.020A. For the A&M relays the highest load value is 0.79A .
- 256lv
By: [)5 Checked: J
~ e Date: 12-13-8';
Date: 12- f- )1 1 Sheet 24 of 7:.. PSE&G SALEM NUCLEAR GENERATING STATION UNITS NO. 1 AND 2 125VDC SYSTEM STUDY CALCULATION NO. S-C-EOOO-EDC-0129-0 Minutes
- c. Category 2B 0-1 1-120 x
Relay Relay Relay Desbnation .IyR§_ .l&1ld 86G (Generator !sol.) GE (HEA) 5.54 HGA (Reset for 86) GE (HGA) 5.54 For Category 2B the highest load is 5.54 and this is the value that will be used for all relays identified Wlder category 2B operating conditions. Minutes D. Catezory 3 0-1 1-120 x 1/2 Relay Relay Relay Deshnation ..Iyp_e l&ad 63X DUNCO (*) 0.020
- See Category 1 The load for this operating category is 0.020A
- 256lv
By: _;J)~S=--~ Date: 12-1.J- 88' Sheet ;:5 of 7:.. Checked: rL.J Date: ;*. f*Jf PSE&G SALEM NUCLEAR GENERATING STATION UNITS NO. l AND 2 125VDC SYSTEM STUDY CALCULATION NO. S-C-EOOO-EDC-0129-0 Minutes E. Cateiory 4 Q-1 1-120 1/2 1/2 Relay Relay Relay Desbnation ~ l&Ad 33X DUNCO (*) 0.020 33Y DUN CO (*) 0.020 74R/B GE (HGA) 0.034 23X DUN CO (*) 0.020 GAX DUN CO (*) 0.020
*See Category l The highest load ident~fied for Category 4 is 0.034A. This is the value that will be used for load current associated with relays in this category.
Minutes F. 0-1 l'-120 1/2 1/4 Relay Relay Relay Desimation .Ixli i&&d 20 ASCO (solenoid 0.245 valve) 256lv
By:~ate: 12-13*8~ Sheet 26 of 74 Checked: -F- -uate: 12-1.f-i! PSE&G SALEM NUCLEAR GENERATING STATION UNITS NO. l AND 2 125VDC SYSTEM STUDY CALCULATION NO. S-C-EOOO-EDC-0129-0 The highest current in this category is 0.245 and this is the value which will be used for load current for all relays identified as operating Wlder category 5 condition. According to the Manufacturer's data there is no appreciable inrush associated with these solenoid valves. Minutes G. Cateaorv 6 0-1 1-120 Since these relays are not energized during the postulated event the load-on the batteries due to relays in this category is zero. Relay Relay Relay Desimation ~ ~ 43X 2-1, -2, *** 2/CST, 2/TR 86B, BD 63 H,L DCX, 94 50-1/X, -2/X 50-1/A 63B/LSP SB 62X, 62F, 62B 94X 6X 63FPX, 63H, 63L sx 26X 256lv
By: Z>:S Date: !2-1!-U Sheet 27 of 74 Checked: lit'. Date: 12- 5* J.! 1 1 PSE&G SALEM NUCLEAR GENERATING STATION UNITS NO. 1 AND 2 12SVDC SYSTEM STUDY CALCULATION NO. S-C-EOOO-EDC-0129-0 H. CatHQl::J!: 7 Breaker Breaker Load Iype I1:ill Close & Charie 13kV ~ 4160V GE Magneblast 6.0A 6.0A + 14.0A 480V ITE, Type K-1600 1.3 11.0A SOOkV West SF.6 Bkrs 15.0A 6.0A I. Connected Load Due to Lhhts Light Light Light
~ [i.mctir;m Load (AMP} Minutes 0-1 1-120 R Stop, Close o.os* x x G Start, Open o.os* x x y Alarm o.os* x 1/2 D w On, Auto, Test. 0.05* x 1/2 E B Block, *Manual o.os* x 1/2 BypaH *Assume Light Load - .OS Amp 1/2
- One half of total number of light* are energized x
- Total number of lights are energized.
-
- No devices are energized xx
- Circuit Breakers which may be tripped or reclosed during
- either time interval 256lv
By:-=-~ Date: 12-13 -8'!: Sheet 28 of 74 Checked: Date: 12-15-31 PSE&G SALEM NUCLEAR GENERATING STATION UNITS NO. 1 AND Z lZSVDC SYSTEM STUDY CALCULATION NO. S-C-EOOO-EDC-0129-0 3.1.V. Load Determination Finally, the actual current required by each of the devices identified as energized during the two hour period was determined. A component list was unavailable and the task of identifying every device from the information provided on the drawings was not possible, therefore, a conservative estimate was made. Rule 13: If a device in one circuit could be identified by manufacturer type, then wherever that device was discovered, it was assumed to be of the same type. For example, the Main Generator isolation circuit lock-out relay 86G was found to be a General Electric type HEA. Therefore, all 86 lock-out relays, were assumed to be General Electric type HEA relays. Additionally, in each category, as identified in Section IV of this criteria, the relays identified were compared to their required load current. The highest value of current obtained in this comparison was then taken to be the required load current necessary to power any one of the relays in that category. In this way, a conservative loading was established. Z56lv
ATTACHMENT 4 Introduction The 28 volt DC distribution system was identified from schematic drawings and evaluated to determine the load on the 28 volt batteries during the (3) time intervals of interest (0-1 minute, 1-60 minutes and 60-120 minutes).
- 1. For the 0-1 minute interval, the load due to the circuits fed from the 28 volt batteries was determined by analyzing each circuit to determine which circuit components (e.g. lights, relays etc.) will be energized during the postulated conditions. Due to the uncertainty related to determining exactly when certain system parameters will activate a given circuit, an additional load equal to 50% of the identified load is added to each auxiliary relay control cabinet load.
- 2. For the second and third time intervals (1-60 minutes and 60-120 minutes) the load was obtained by tabulating the various components in each circuit powered by the 28 volt batteries and then determining the connected load based upon the number of components/devices connected and their functions.
Assumptions and Data
- 1. The batteries are fully charged prior to any event (e.g. short circuit, or loss of AC power causing a battery discharge) .
- 2. No consideration is given to any emergency interties between the 28 volt DC systems lA and lB, and 2A and 2B.
- 3. The scenario for battery discharge calculations is that a loss of AC power occurs coincident with a loss of coolant accident (LOCA).
- 4. For (2) hours immediately following the coincident loss of AC power/LOCA event, no battery chargers are available.
Load Profile Calculation The load profile calculation for each of the Salem 28 volt battery systems (lA, lB, 2A and 2B) was performed as follows:
- 1. The latest revision of the arrangement drawings for the batteries were obtained. These drawings, along with their associated systems, were then tabulated.
- 2. The schematic drawings referenced on each of the drawings collected for step 1 above, were collected.
- 3. For each schematic drawing, the 28 volt DC distribution system was identified to determine the load on the 28 volt batteries during the (3) time intervals of interest (0-1 minute, 1-60 minutes and 60-120 minutes).
- For the 0-1 minute interval, the load due to the circuits fed from the 28 volt batteries was determined by analyzing each circuit to determine which circuit components (e.g. lights, relays etc.) will be energized during the postulated conditions.
- For the second and third time intervals of interest (1-60 minutes and 60-120 minutes) the load was obtained by tabulating the various components in each circuit powered by the 28 volt batteries and then determining the connected load based upon the number of components/devices connected and their function.
- 4. The individual circuit breaker short circuit and full load current ratings for each auxiliary relay cabinet was recorded.
Details of "Time-seauence" Loading Analysis Assumptions (details) for the "Time-Sequence" load profile analysis of the auxiliary relay control cabinets during the 0-1 minute time interval are as follows:
- 1. All component loads are rated 100 ma, 24 volts DC.
e e
- 2. Subsequent to the postulated event, load shedding occurs. This is followed, at approximately (14) seconds into the event, by load sequencing on the vital buses. All load sequencing is completed after (30) seconds.
- 3. All flashing alarms are acknowledged manually within the first minute and up to (8) push buttons can be manually operated simultaneously.
- 4. Due to uncertainty in determining the exact time when certain system parameters will activate a given circuit, an additional load equal to 50% of the identified load is added to each auxiliary relay control cabinet load.
Assumptions (details) for the connected load calculation during two of the time intervals (1-60 minutes and 60-120 minutes) are as follows:
- 1. The connected loads due to relays are shown in the foilowing tabulation.
~
Item Relay Relay Relay Mi11utH No. Designation. Function. Load AMP I 1-60 I 60-~120
- !I2!....
A 5 Stop, Close 2 0.096* I x I x B 6 Start, Open. 5 c 0 Inter-(Operate) 8 0.096* I 1/2 I 1/4 R Locked (Reset) 0.080* D FL Flaa her s I 1/2 E. 74X/DC Loaa of 28V DC 2 0.096* I x I x F 62, 2 Time Delay A thru H I 1/2 I 1/2 G 74C Clo** Alarm s 0.096* I 1/2 I 1/2 H 74T Trip Alam s 0.096* I x I 1/2 I 74S Bkr Spring Chara* Failure s 0.096* I x I x J l, 71, 83,4 etc. Auz. Relay 2 0.096* I x I x K 74 Alam (Any Other) s 0.096* I 1/2 I 1/2 X
- All relay* emrgized
*Assume Relay Load
- O.l Allp 1/2
- Ou half of total number of relay* are energized 1/4
- Ona quarter of total n.uaber of relays are energized
L ..>
- 2. Relay Operation Assumptions
- Item "A" or "B" relay is energized continuously.
- Item "C" relays have only one coil energized at once by a momentary pulse or a maintained signal. It is assumed that 1/2 of the relays have a maintained signal present during 59 minutes after the first minute and 1/4 of them remain energized during the last 60 minutes.
- All item "D" relays flash at once and are acknowledged by the operator within the first minute. It is assumed that after the first minute, 1/2 of the relays reflash during the postulated event for a duration of 60 minutes.
- Item "E" relays are always "on" (no 28 volt DC failure). Relays are normally energized and contacts open to alarm.
- Item "F" relays operate within one minute, however, only 1/2 of these relays remain energized for 120 minutes.
- Item "G" or "H" relays are energized for one minute. 1/2 of all item G and H relays remain energized for 120 minutes.
- Item "I" relays are always energized.
- Item "J" relays are always energized.
- Power consumption due to the relay surge suppression diodes is negligible.
- Item "K" relays operate the same as item "G" or "H" relays.
- Dunco relays consume 77% of 0.1 Amp when "Hot", however, it is assumed that all are in the "Cold" state (0.1 Amp).
- 3. Connected loads due to lights are shown in the following tabulation.
,itr i.
Item Light Light Light Minutes No. Color Function Load (Amp) 10-1 I 1-6i5 I 60-120 I A R Stop, Close 0.08* I x x x B G Start, Open 0.08* I x x x c y Alam 0.08* I x 1/2 1/2 D w On, Auto, Test 0.08* I x 1/2 1/2 E B Block, Manual, 0.08* I x 1/2 1/2 BypaH
- Assume Light Load
- O.l Amp 1/2
- One half of total nwaber of light* are en*rgized
- 4. Light Operation Assumptions
- Item "A" or "B" lights are energized continuously.
- Item "C" lights are energized for the first minute. 1/2 of all Item c *lights remain energized for the 1-60 minute and 60-120 minute time intervals.
- Item "D" or "E" lights are energized at time zero, and 1/2 the nuriiber of indicating lights remain energized after one minute.
ATTACHMENT 5
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- vohage (HOLDINC)
All coils are designed for indumi1I oper* shown 11 lef1. 1 dlffMent coil or insula*
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following vollage rangn:
, ~Wf.' fon!u,.mitl~n,_
........ AC
...... DC
"' Power consumpcaon Of solenoid valvft may be decermined from che riling in
'111ta11 lalin1 2*
°'*'8tilll 1111111 5.1* u ASCO bulletins. for valve on AC service.
the wan r.a1ing.1hevoh-ampere inrush" 21). 2*
' .ind the volt-ampere '"holding are given. w1nscoc1 1211 lllZ*l211 12 112-IU AMPS *
>>a The vall-amp (VA) "Inrush.. is the high
"- qo 2.a :NM-2.0 I+ 1211 M
2q 2DWU, momentary surge of cunent which oc-curs .a1 the moment an AC solenoid ir. vohage left: SDIClll cM 111 reqwld .. Miiey C-... CIC1lll energized. Noles 111 \Vhen ii wm IY* been energized for
*fltrt . . . 111111 ,......, Iii IJ1IGly , . _ . . .
- Ions period lM IOlenoid enclowre becomn rtr tllfw 1ppla......_ W*llt~-CllUH The voh*amp (VAi .. holding" is 1he hot *nd cannot be touched by hand escepl CDlll llt nllillllt 11111'. . . -
- 1* I . . , . continuous currenc draw .after the ini- la."' imlan1. This is a perfealy wfe opcwing llftll tQ91wlltrlt II 12' ..... 21\ lllllllf _.Ult li.il "inrush.** 1emper1ture. Any escn\Mt M*ling will be I 60"C ll*O"f J 1111....: ~ _ . . 1111111 The currenl rating for che "inrush'" and indicated by lM tmDling .and b&: *. Intl odor of llt 125 Incl 250 QC dell ralllllll IO I 911111 I-ct the coil insulation.
DI 90*UD Ind IU.JIG. fftCllOlilr ....... "1tC"' "holding" may be determined by divid* Cll Valllft lot AC 1ervic:e can be conwe-rted for lo 1111 a&lbc lllllllln ing the vollage into che volt-amp racing. use on other AC voh;agn simply t:y cNnging All ASCO vollves .ire tesced to operace thli coil: Minilarly, DC waiwft can be convcriw
.ti 15'X. under 1he nominal voholge .ind ac la. use on other DC wcl1a1n. When converl*
molximum operating pressure differen* AMPS ,. voh-01mp "Inrush" Ina from AC lo DC or wice YflW, con\ull your lioll, olnd .lre c.ip.iblc of oper.llin11 for (INRUSHI vollolge local ASCO Ylft olfice lor inllfuction\. G-10 ;\ulnmulic: S\\ ilrh ( :;,, r,u.\I. llJ"'"'" Nuo111.11tw1wm "~'"* ..._ ,..,..., onn. Tlll.1mi ,...2000
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