ML20039A035

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Forwards Comments on Evaluation of SEP Topic VI-7.C.1, Independence of Redundant Onsite Power Sys. Current Licensing Criteria Met
ML20039A035
Person / Time
Site: Big Rock Point File:Consumers Energy icon.png
Issue date: 12/09/1981
From: Vincent R
CONSUMERS ENERGY CO. (FORMERLY CONSUMERS POWER CO.)
To: Crutchfield D
Office of Nuclear Reactor Regulation
References
TASK-06-07.C1, TASK-6-7.C1, TASK-RR NUDOCS 8112160162
Download: ML20039A035 (13)
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{{#Wiki_filter:. -.. p1,1-r.:. Consumers Power Company General OFlees: 212 weet Miehlgen Avenue, Jeekeen, MI 40201 *(517) 7818 0680 I December 9, 1981 ~ g'y.,* }.[1 s e g Y s\\,. Y' L gg e gd 8 E A% W/ ;, ! [W \\1 Director, Nuclear Reactor Regulation Att Mr Dennis M Crutchfield, Chief ~ ' Operating Reactors Branch No 5 US Nuclear Regulatory Commission Washington, DC 20555 DOCKET 50-155 - LICENSE DPR BIG ROCK POINT PLANT - SEP TOPIC VI-7.C.1, INDEPENDENCE OF REDUNDANT ONSITE POWER ~SYSTDIS =By letter dated August 28, 1980, the NRC transmitted for review a draft

evaluation of ~ SEP Topic VI-7.C.1 for the Big Rock Point Plant.

Consumers Power Company has completed its review of this document and provides the attached comments for your consideration. a P. 9~g~ Y -Robert A V Staff Licensing Engineer CC JGKeppler NRC Resident Inspector-Big Rock Point 2 pages 03 7 s I ( 8112160'162 811209 ~ PDR ADOCK 05000155-P. PD. R.-

i e ENCLOSUpI REVIEW OF SEP TOPIC VI-7.C.1 INDEPENDENCE OF REDUNDANT ON-SITE POWER SYSTE:G A. Summary of NRC Evaluation The ob,1ective of the NRC evaluation was to determine if the on-site elec-trical power systems (a-c and d-c) are in compliance with current licensing criteria for electrical independence between redundant standby (on-site) power sources and their distribution systems. As current licensing criteria, the NRC has cited the following: (1) 'Ihe standby source of one load group should not be automatically paralleled with the standby source of another group under accident conditions, (2) No provisions should exist for automatically transferring one load group to another load group or loads between redundant power sources, (3) If means exist for manually connecting redundant load groups together, at least one interlock should be provided to prevent an operator error that would parallel'their standby power sources, and (h) Each d-c lead group should be energized by a battery and battery charger. The battery / charger combination should have no automatic connection to any other redundant d-c load group. As summarized in the NRC evaluation, the a-c and d-c power supplies meet the current licensing criteria for independence of redundant power sources. B. Detailed Review of the NRC Evaluation As indicated in the paragraphs that follow, the NRC evaluation has been reviewed for accuracy. Co=:ents have been generated regarding the accuracy of the NRC statements which attempt to describe the Big Rock point power systems. Superscripts are used throughout the following paragraphs to make reference to information sources which serve as a basis for the ec= ment. Certain information sources have been attached where required for those comments which describe incorrect NBC statements. The incorrect NRC statements are su=marized in Section C. B.1 A-C Supplies During conditions in which off-site power is available, h80V safety Bus 2B is supplied by power from h80V plant Bus 2A through tie Breaker 2A-23.1 An alternate feed to safety Bus 2B is from h80V plant Bus lA through tie i Breaker 1A-2B.2 Upon loss of off-site power, the tie Breakers l A-2B and j 2Ar2B are both auto =atically tripped open whenever the emergency diesel generator output voltage reaches approximately hh0 volts (this is approx-imately 92% of rated output voltage).3 ' If either tie breaker (1A-2B or

i 8 2 + 2A-23) is closed, interlocks in the diesel generator output breaker close circuitry vill prevent the breaker from closing. These interlocks are in the form of an auxiliary "b" contact from each tie breaker. The "b" contacts (each contact is open when its associated tie breaker is closed) are both in series and are also in series with the Bus 2B undervoltage and v diesel generator output voltage relay contacts ghat close to provide automatic closuto of the diesel output. breaker. Although limit switch Contacts IS/1A-23 and IS/2A-23 are shown in parallel with ' tie Breaker "b" . Contacts 1A-2B/b e.nd 2A-2B/b, respectively, these limit switches ~ are nor-mally open. The limit switches are only closed v'.en the respective tie t breakers are " racked out" (see attached Drawing 0740G 30105, Rev Q). Also shown in Draving 07kOG 30105, is the. fact that an open tie breaker will also prevent a manual attempt to close the diesel generator ottput breaker. The procedure to cortnect the plant buses (lA and 2A) to the safety bus (2B) requires that the operator perform the following actions to support essential plant load with the emergency diesel generator during a loss of all off-site a-c power.5 (Note: The diesel generator vill have already been automatically started, will have established sufficient output voltage and will have closed in on safety Bus 2B 'atter the 1A-23 and 2A-2B tie breakers have opened): (1) Open all breakers on Bus 2A except #3 air compressor, RDS-UPS power supply (C and D) and Panel 2P. (2) Open load center Breaker 52-2A. (3)- Close 2A-2B tie breaker. (k) Open all breakers on Bus lA except screen structure Bus 1C, RDS-UPS power supply (A and B), canal sample pump and the well house. (5) Open load center Breaker 52-1A. (6) Close 1A-2B tie breaker. At this point, the diesel generator is sequentially loaded with essential plant equipment. All of the above breaker actions are manually initiated. It should be noted that the NRC account of the above procedures incorrectly indicates that all loads are removed from Buses lA and 2A prior to closing the. respective 1A-2B an(. 2A-2B tie breakers. Discussion with plant per-sonnel has revealed that the 1A and 2A loads (as described in procedural Steps 1 and h above) are left connected to t,he plant buses to ensure that .these loads are energized as soon as possible. This procedure ensures better load control during the plant response to a loss of off-site power. Synchronization check relays which prevent paralleling the diesel generator to the off-site power sources do not exist at the plant as is indicated 1 in the NRC evaluation. To ensure that the diesel generator is not paralleled vithoff-sitesources,tieBreakerslA-23and2A-23areautomaticallyopeged { prior to the diesel generator output breaker closing in on safety Bus 2B. j i

1 3 As a result the diesel generator closes in on an effectively isolated safety bus. During the procedure in which essential plant loads are then transferred to the diesel via the safety bus (as described above), the operator is required to open load center Breakers 52-1A and 52-2A prior to closing the respective 1A-2B and 2A-2B tie breakers. This ensures that the diesel generator vill not be paralleled to the off-site supplies. Once the diesel generator is automatically started and closed in on the isolated safety bus, no automatic transfer of loads or load groups between the on-site and off-site power supplies exists. The load and load group breakers (ie, load center Breakers 52-1A, 52-2A and cross-tie Breakers lA-2B and 2A-2B as well as the other MCC 1A, 2A and 2B breakers) feature manual closing capability only.h B.2 D-C Supplies A single station 125V d-c battery / charger set exists to supply the plant loads and a portion of the safety requirements.I The battery / charger set supplies 125V d-c motor control center Bus D01 and 125V d-c distribution' Panel D02.7 It should be noted, however, that the battery charger is actually two battery chargers in parallel (Charger #1 and Charger #1A).I In addition to the station battery / charger set, four uninterruptible power supplies (UPS) also exist at the plant. Each of these UPSs consists of a battery, battery gharger and inverter.8 Each UPS has outputs for 120V a-c and 125V d-c loads. In addition to the aforementioned d-c supplies, the ' diesel fire water pump and the diesel generator have their own battery / charger sets for starting power.9 The diesel fire water pump battery / charger set also supplies its own control power.9 In the February 27,1976 " Report on Evaluation of Adequacy of 2:ergency Core Cooling System" it was determined that the failure of the station battery / charger set, with a loss of off-site power, would disable the ECCS.10 As a result of this determination, the Consumers Power Company implemented the reccmmendation made in the subject report to remove the emergency diesel generator's dependency on the station tattery by reassigning the generator and ils associated (1A-2B and 2A-2B) breaker 125V d-c control circuits to the UPS-A source.ll It should be noted that the NRC evaluation is incorrect by stating that in addition to the diesel generator tie breaker and the two plant-to-safety bus tie breakers, the control power for the diesel generator was removed from the station 125V d-c battery set and placed on the UPS "A" 125V d-c source. Although the ~ource of power to the diesel generator tie breaker and the two plant-to-safety bus tie breakers was reassigned to the UPS "A" 125V d-c output 12, the supply to the diesel generator control cir-cuits was not changed. The supply to the diesel generator controls is from its own 2kV d-c battery / charger set.13 The diesel generator battery charger is fed from the 120V a-c lighting Panel 10L.14 The diesel generator control circuit power source was not reassigned since it was not dependent on the 125V d-c station battery / charger set. 4 =

-s 3 C. Corrections to the NRC Evaluation The folicving list sum =arizes the required corrections to the NRC evaluation. Each of these required corrections is described in detail in Section B of this report. C.1-Page 3. Paragraph 1 states that both tie breakers between the safety bus and the plant buses are automatically opened. This is only par-tially correct. As described in Section B.1, the tie breakers will not open until both the undervoltage condition and adequate diesel generator output voltage is established. C.2 Page 3, Paragraph 2, Sentence 1 cannot be understood. If this sentence has any significant impact on the SEP Topic, it should be reworded. C.3 Page 3, Paragraph 2, Item (2) erroneously states that all loads are removed from the plant bus (1A or 2A) prior to closing the tie breaker. As described in Section B.1, certain Icad breakers are maintained closed to ensure that certain vital loads are energized as scon as possible. C.h Page 3, Paragraph 3 incorrectly states that synchronization check relays exist to prevent paralleling the diesel generator to the off-site power. sources. As described in Section B.1, such relays do not exist. C.5 Page 3, last paragraph states that a single station 125V d-c battery / charger set exists at the plant. Although partially correct, Section B.2 of this report notes that the battery charger is actually a parallel combination of two chargers. C.6 Page k, Paragraph 2 erroneously states that the diesel generator control circuits were also removed from the 125V d-c station battery set and placed on UPS "A". As described in Section B.2, the control circuit supply was not changed as it is fed from its own independent battery / charger set. D. Conclusions As a result of this review, it is the opinion of the Conswners Power Company that the current licensing criteria as described in Section A of this review is complied with. A

'e t e REFERENCES Reference Number Reference Description 1 Standard Operating Procedure SOP-28 " Station' Power", Rev 7, Item 6.2.h. 2 CP Co Drawings WD Th0, Sheet 12, Rev M and WD Th0, Sheet 13, Rev N. 3 C? Co Drawing 07h0G 30105, Rev Q and CP Co Relay Setting Sheet #581C (both attached). k CP Co Drawing 0740G 30105, Rev Q. 5 Standard Operating Procedure SOP-28 " Station Power" Rev 7, Item 6.2.1. 6 Off-Normal Procedure ONP 2.36 " Loss of Station Power" Rev 5, Item 2.36.1.2 e and f. 7 CP Co Drawing WD Th0-11, Rev T (attached). i 8 CP Co' Drawing O7h00 31001, Rev B. 9 Diesel Generator CP Co Drawings: 07kOE 30869, Sheet 2, l Rev K, 0740A 30009, Sheet 19, Rev D and Lester Equipment Mfg Co Inc Drawings 1259E and 1289D (origins 1 revisions). Diesel Fire Pump CP Co Drawings: O7h0A 308h2, Rev B, 07h0A 308h3, Rev A, 07h0E 308h0, Sheet 1, Rev C and O7h0G 3011h, Sheet 1 Rev T. 10 I4tter: RBSevell (CP Co) to S J Chilk (NRC), 2/27/76, " Report on Evaluation of Adequacy of Emergency Core Cooling System" Attachment #1, Pages 11 and A-8. 11 Pages 7 and 8 of the report described in Reference #10. l 12 CP Co Drawing 07h0G 30105, Rev Q. 13 CP Co Drawing 07h0E 30869, sheet 2, Rev K and tester Equipment Mfg Co Inc Drasings #1259E and 1289D; original revisions (all attached).' 1h CP Co Drawing O7h0A 30009, Sheet 19, Rev D (attached). -.r+

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e........ SYSTEM PROTECTION - SETTINGS LADORATORY TECHNICAL SEHVICES - TEST JtLCORD Plant BiR ROCK Bus 20 AC8 Plant Procedurs NA Revision No. ~ Voltage MV MCC Lab Procedure No. Revision No. Protected System Emergency Generator Overvoltage Plant FC of MO No. N8 Was SS 403, Rev 0 Q Listed Notes: g,,,,,,,,g,,,,, 9999 proi <tiv. oevice _ _PJVll PT Ratio 480 V/120 V oooo AS FoOND AS LEFT 55** I/) Accept Status a se.4 Uni:. Phase or Zone Function or Element Setting Acceptance Criterie Setting Variance in Out - In Op Setting Variance gg 2iI! X-Y PHASE Iai5 70-160 V Pickup 110 V 106-116 V E$E5 m [L ' $ t na "ERn F i** &rna 3ED5 gC23 I? ya% Attachment EIe nc 6-tL ~g 3.3 " < 1 '. C ~$$A 4 . i mgaa

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  • indicates Addition or Change Since Last issue Specifications 581c O

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lc0 [l [ ~..- ~ 1 Install ch uger and batteries in same room so that 11 If battet u s lever cc=e up to cm me Heific l lo-..rickle t' they are in air of the same temperature. Erevi ty, 1 set fr- ~ rate ar TVh e.o e 2 Af ter charger is mounted, bring in the supply lines via conduit acco:.iing to local code thru 12 To c..tek the 2..c. .el th, t' connect u.- ..t.n / uminals knockout nearest the AC teminal strip. a 1A acuracy Im rometer to and wt-c voltage whos..Hi shifts char.er i ist rate, e 3. hun 12 funge type TW 1eads frcm DC output (BAT) Fo'r deired shut-off voltage, multiply nun er of teminal strip to battery teminals, making 13 lei-scid cells by the volts per cell shown cpposite sure thst pclerity is not reversed. Iength of these leads should not exceed 10 feet. Be sure actual air tenporatu w. to connect "ST AIC" teminal cf battery terminal 35 deg F -2.51 80 deg F -2,35 boatd to the side of the engine starter Soleno$d to den F -2.50 90 deg F 2,31 ./- 50 dog F -2.L6 100 deg F -2,27 which has teltage on it only when starter is f 60 deg F -2.h3 110 deg F -2.22 energized. L 4 F -2.LO h. Set charger evitch to "0N" and note charge rawe. Abovo IJgures are for heavy duty autonotive type shown on c.ra eter. Rate vill vary with state of batteries with 1260 full charge specific gravity, battery charge, AC supply voltage, and tap setting For long 1.1 Ce industrial batteries with 1220 on AC input terminal strip. i 5. Tap is set f or 115 volts AC when charter is shipped specific gruity, deduet.05 from above voltages frcm factory. F.ove coiled lead on AC input teminal per cell. For other types consult battery strip tovait "HIGil" to increase charge rate, thus manufacture. Ih. To adjus;t the TVR, renove plastic cover. Use conpensating for lov supply voltage and vice versa. l When batteta-specific gravity is 1120, proper tap pencil point to n.ove adjusting eerew and nut on end of coil spring ausy from noulded support, l setting wil", produce r.n.tvoa charge rate choun on stretching apring as little as possible. With-charger nsn plate. Never exceed this current, I 6 This is tut tr.atic two rate charger. The plastic out turning adjusting screw, carefully turn nut 1/6th turn at a time and release so that flats O encloccd rd.sy is an invetse-tcrperature compen-O of nut receat in moulded support. Turrdne nut sated volta :e relay (TVR) which mritches the l charp.,er to.ow rate when batteries are approx-clockwise to increase tension raises the operat-imately 85.1 charges. Since it will not operate in I g voltage and vice versa. Cover must be in the lew to tigh direction at noms 1 battery voltages, y gplace when checking operating voltage. I D a push buttm is supplied below the TVR for manual n@ -1 n recet to hi;h rate. _ g.g 7. All ro3els ecycle to high rate autenatically when-(R3FIED TRUE COPT,.pq t%"r.. g(p as nm.., cvor the en rine starter is energized by either manual g ^ NOV5 1987 control or tutomatic engine controller

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8 If the char ter model number ends with a "C", it has l r-Attachment ( an c1cetric timer which recets to high rate auto ? 'O e - -- matica11y e scry 2h hocrs and whenever the engine l W ~ Lest.ei I'quipinent A n s anc starter is snergized. f9. The resiste e en the chassis should be adjusted to the firal ;eady state voltage under trickle charge LO S A N G f t ES I S 'At fF recow.e ndet by the battery manufacturer. ... n 10. If the bat sries require water more than once a month, n, either ren ster is set for too high low rate or TVR is 6/lb/60 .w.o INSTRUCTIONS FOR TVR TWO R8LTE 1 n' c.TiliT0T NTTERY c!!410EltS ,1259 E a....,, . e -..e e.w i

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K2 s e l_ __j ( y 2 +. + ' V r - [-< /5" >-1 h mtg holes for f" lag screws 3/h" & 1" knockouts, h.Yy' { i A ^ T top and bottom { 6" clearance on both sides and 12" clearance at bottom " Ot.. , g Yellw _ _l g3 recor.nended for good cooling a - 3.R.T_ _ ~ sT o _..- - -d + Alarm i-- m / L v 3i For starter circ tits with nerative (-) thru starter ^ 8 cor tactor use broken lines, breaking solid lines at X gd il-4 + bot. _1. ~ BATT j For0R "STAIC TEliMINAL OF CHAhbER MUST BS ComECTED TO CONTACTOR I O --- TEitMI?!AL Wi!ICli HAS VOLTAGE ONLY WHEN STARTElt IS ENEliGIZED. O ~ This drawinr applies to Models: 2hT6fC, 2hT10RC, 32T6RC Eh 32TIOftC, 36T6RC, 36T10RC DURI@,(rflSTALLATION CilECK POSITION 09 VELLO! '4 IRE ON CHAlcJEhBATT. TE!CTIAL STRIP. C;Ot;GE I? '.T.CESSAllY. /.mn.k tg) 8m ao Lwster E,qu.ynnent Mf. Co. Inc. z cm itte-et ,b b. NOV5 1981 <e LO S ANGEL ES 15. C Allf o -- a ua ..,", 5g; y,1 CONSUMERSPOWG ... a 4 CO. h' (- . ;.1 ' ' ' ~ ~ ~ ' " " ' 8dNN i A9TP9Mc ? c nTY 3ATTr:' cuc.n --- m.,_ci.:~ am_ _ ... r.. v.., c

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