ML20039F830

Forwards Detailed Review of NRC 800703 & 810818 Draft Evaluations of SEP Topic VIII-3.B, DC Power Sys Bus Voltage Monitoring & Annunciation. Existing Plant Design Meets Either Current Criteria or Intent W/O Mods

ML20039F830
Person / Time
Site:	Big Rock Point File:Consumers Energy icon.png
Issue date:	01/07/1982
From:	Hoffman D CONSUMERS ENERGY CO. (FORMERLY CONSUMERS POWER CO.)
To:	Crutchfield D Office of Nuclear Reactor Regulation
References
TASK-08-03.B, TASK-8-3.B, TASK-RR NUDOCS 8201130437
Download: ML20039F830 (32)

Text

{{#Wiki_filter:o e consumers 9', b Power company g ascewco -A JAN 121982>- 1 h I D.31 Enggy gg General offices: 212 West Miciegen Avenue, Jeckson, MI 49201 + (517) 788-o550 nomewemu S Tc; January 7, 1982 b g 4 -a Dennis M Crutchfield, Chief Operating Reactors Branch No 5 Nuclear Reactor Regulation US Nuclear Regulatory Commission Washington, DC 20555 DOCKET 50-15; - LICENSE DPR BIG ROCK POINI PLANT - SEP TOPIC VIII-3.B, DC PUAR SYSTEM BUS VOLTAGE MONITORING AND ANNUNICATION By letters dated July 3, 1980 and August 18, 1981, the NRC issued draft evaluations of SEP Topic VIII-3.B (DC Power System Bus Voltage Monitoring and Annunciation) for the Big Rock Point Plant. Consumers Power Company has completed a detailed review of these documents, and provides the attached comments for your consideration. As you will note, Consumers Power Company-has concluded that the existing plant design either meets current criteria or its intent without modifications. David P Hoffman Nuclear Licensing Administrator CC Administrator, Region III, USNRC h3C Resident Inspector-Big Rock Point h Pages f OW 3 / YO oc0182-0002bl42 O P

TONR 85-81 ENCIESURE REVIE'd 0F SEP TCPIC VIII-3.B "DC POWER SYSTEM BUS VOLTAGE MONITORIIG AND ANNUNCIATION" 3IG ROCK EOI'C PIAIC A. INTRODUCTION The NRC has evaluated the DC power system monitoring and annunciation systems at the Big Rock Point Plant. This evaluation was forwarded to the Consumers Power Co. pany as part of letter D M Crutchfield to D P Hoffman dated 7/3/80. The purpose of the NRC technical evaluation (TI) was.to determine if such systems conform to current licensing criteria. Since the TE describes specific monitoring and annunciation requirements which appear to be somewhat arbitrarily chosen, the purpose of this review is to indepen-dently determine if these monitoring and annunciation systems at the Plant are indeed in conformance vita current criteria as described in the TE. B. SU??'.AP.Y OF THE TECHNICAL EVAIUATION (TE) According to Page 1 of tne subject TE, the NRC derived specific require-ments for the DC power system monitoring and annunciation systems from the general requirements embodied in Sections 5 3 2 (4), 5 3 3 (5) and 5 3 4 (5) of a c. 308-1974 and in Regulatory cuide 1.47 The specific requirements, as derived by the NRC and itemized in Section 2.0 of the TE, consist of eleven parameters. According to the TE, the status of each of these para-l meters is to be displayed in the control room. The TE, however, offers no specific justification or basis for the selection of these specific para-meters for control room display. Section 4 of the TE concludes that of the eleven parameters currently required to be indicated or alarmed in the con-trol room, only two are alarmed for the 125V DC and UPS systems and none are indicated or alarmed for the two diesel battery systems. Therefore, the TE states that "the Big Rock Point DC power systems are not monitored in compliance with current licensing criteria." In more recent correspondence, the NRC has reduced the list of parameters for which a status display is required in the control room (refer to let-ter: D M Crutchfield to D P Hoffman, 8/15/81, "SEP Topic VIII-3.B, DC Power System Bas Voltage Monitoring and Annunciation, Safety Evaluation For Big Rock Point"). The new requirements are that, as a minim'm, the following indications and alar =s be provided in the control room: i I 1 l l

1. Battery Current (A:: meter-Charge / Discharge) 2. Battery Charger Output Current (Ammeter) 3 DC Bus voltage (voltmeter) 4. DC Bus Ground Alarm (For Ungrounded System) 5 Battery Breaker (s) or Fuse (s) Open Alarm and 6. Battery Charger Output Breaker (s) or Fuse (s) Open Alarm As in the TE, no justification or bases were provided for the selection of these six specific para:eters cr, for that matter, the deletion of certain other parameters from the original list of eleven. The afore=entioned letter concludes that the Big Rock Point DC power system monitoring is not in compliance witn current licensing criteria and that the above six indi-cations or alarms be installed. C. INDEPE'iDE!!T REVIEW As described in Section A of this report, it is the opinion of the Consu-mers Power Company that an independent review of the DC system monitoring and annunciation systems is required since the specific NRC require =ents appear to have been arbitrarily chosen. This section of the report serves to redefine the current criteria as described in the TE and to evaluate the degree to which tne existin6 =onitoring and annunciation systems con-form to the current criteria. C.1 current Licensing Criteria As describe:i in the TE, Sections 5 3 2(4), 5 3 3(5) and 5 3.4(5) of IIII 306-1974 provide the general require =ents for DC systems. These sections are listed below. 5 3 2(4) "The distributien system shall be =onitored to the extent that it is shown to be ready to perform its intended function." 5 3 3(5 ) " Indicators shall be provided to monitor the status of the battery supply." 5 3 4(5) ' Indicators shall be provided to =onitor the status of the battery charger supply. This instrumentation shall include indication of: a. Output Voltage b. Output Current c. Circuit Breaker Position." As can be seen in the above three sections of IEEE 308-1974, only three specific parameters are identified for required indication. Neither of these three sections require indications in the control room. Regulatory Guide (BG) 1.47 " Bypassed and Inoperable Status Indication for IIaclear Power Plant Safety Systems" was also cited in the TE as part of the current licensing criteria for this topic. Although l RG 1.47 does not specify certain parameters that need to be indicated, it does provide general guidelines as to the selection of parameters 2 l

for auto =atic control room indication. In its introductor/ para-graph, IU l.47 cites as principal design criteria Appendix 3 to 10 CFR 50 and Section 4.13 of IIEE 279-1971. These criteria are further detailed in the two paragraphs that follow. RG 1.47 references Criterion XIV of Appendix 3 to 10 CFR Fart 50 which requires that =easures be established for indicating the opera-ting status of structures, systems and components of the nuclear power plant, such as by taggirg valves and switches, to prevent in-advertent operation. Regulatory Guide 1.47 also references IEE2 279-1971, " Criteria for Protection Systems for Naclear Power Generating Stations," Para 6raph 4.13 which states: "If the protective action of some part of the system has been bypassed or deliberately rendered inoperative for any parpose, this fact shall be continuously indicated in the control room." As described in Section 1 of the TE, the requirements of IEEE 308-1974 and R31.47 can be sn-eized by statin 6 tnat the DC system (batteries, distribution systems and enargers) shall be monitored to the extent that it is shown to be ready to perform its intended function. C.2 The Big Rock Ibint DC Power Systen Monitoring and Annunciation At 31g Rock Point, seven separate DC power syste=s exist to supply safety-related Plant loads. These systems are: 1. One station 125V DC pcwer system co= prised of one batter / and two chargers. 2. Four uninterruptible power supplies each co= prised of a batter / and charger. 3 A diesel generator battery and charger. 4. A diesel fire pump battery and charger. The existirg monitoring and annunciation for each of these syste=s is described in the paragraphs that follow. C.2.1 The 125V DC Station Power System The existing monitoring and annunciation for the 125V DC station power system is shown in Attachments 1 and 2. As shown, both local and control room indication exists. This indication is described in the following para 6raphs. In the descriptions, the applicable IEEE 308-1974 require =ents are given in parentheses. These are the requirements to which the existing Pht indication either conforms (where instru=enta-tion is specifically called out in the standard) or provides 3

the necessary infor:ation such that required monitoring (as called out in the stanciard) can be perfor=ed. Attach =ent 1 shows tne local instrumentation. As can be seen, the 125V DC status power syste features local indication as described below. 1. Battery charger output current - This is provided by an ar:eter located in the battery charger cabinet (5 3 4(5)). 2. 125v Dc bus voltage - Although this voltmeter is located in the battery charger cabinet, it is connected to the bus (or battery) side of the charger's output breaker. There-fore, this =eter actually indicates the bus potential which is the system's " float" potential of 129V DC as maintained by the charger. Should the charger fail or become discon-nected, tne meter will indicate battery potential. (5 3 2 (4), 5 3 3(5) and 5 3 4(5)). 3 125V DC bus current - This a==eter is installed in the bus common to both the battery and the batter / charger. There-fore, this meter is capable of indicating the batter / supply in the case where the chargers are unavailable for service. The meter normally monitors the battery charger supply while it is carrying Plant load.. This meter is located in Motor Control Center D01 which is approximately 10 feet from the battery charger cabinet. (5 3 2(4) and 5 3 3(S)). 4, 125V bus ground - A mim-ter is installed locally at the charger to provide indication of the magnitude of either positive or negative bus ground current. (5 3 2(4), (5 3 3(5) and 5 3 4(5)). shews the control room indication. As'can be seen, a "125 Volt DC Trouble" alar = is energized whenever any one of the indications exists as described below. l 1. Eattery/ battery charger overcurrent - This cor.dition is l trans=itted by Relay 76 which is located at Panel dol. l This relay senses current in the bus co= mon to both the l battery and the chargers. The relay will provide indica-l tion of a 125v DC system overload or fault condition which could effect the 125V DC supply (either the charger and the battery during normal " float" operation or an isolated bat-tery during a loss of charger condition) (5 3 2(4) and (5 3 3(5)). 2. Positive or negative bus ground - This condition, re6ard-less of its location, can be sensed by Relay 64 and trans-citted to the control room. It should be noted that this relay is actuall, the milliammeter described in item 4 "125V bas ground" above. Alarm contacts, located in the millia==eter, provide the control room annunciation. (5 3 2(4), 5 3 3(5) and 5 3 4(5)). 4

3 Icss of charger input supply voltage - This condition is transmitted to the control room by charger relay PLR (re-fer to Attachment 3). This relay will provide the alar if the charger input supply breakers are opened. (5 3 4(5)). 4. 125V DC bus undervoltage - Similar to the 125V DC bus local indicator, relay LVR (see Attachment 3) senses voltage on the bus side of the charger's output breaker. This relay transmits the alarm to the control room via auxiliary Re-lay 27/ARX should the bus voltage drop to 3 120V DC. It should be noted that Relay 27/ARX, which is normally ener-gized with sufficient bus voltage, =aintains energized a white 116 t on control room Panel CO2 (see Attach =ent 2 h and 3). This light gives the operator the ability to deter-mine whether or not a bus undervolta6e condition has caused the "125V DC System Trouble" alarm to annunciate. Should the "125V DC System Trouble" alar = occur, the opera-tor is instructed by Procedure ALP 15 " Turbine and Genera-tor Systems Annunciator Tabulation," Rev 9, to perform the following: a. Check for proper high loads, b. Check that LT-3 is in service. c. Check ground indicator and isclate ground if possible. d. Atte=pt to reset the losa of charger input relay PlR. e. Transfer to alternate charger if necessary. fs Refer to Emergency Procedure EMP 31, "Ioss of DC P:wer System." In addition to the indications described above, additional surveillance is maintained on the 125V DC station power system. As described in Staadard Cperating Procedure SCP-28, Rev 7, " Station Ruer," Iten 6.1.4, the following batter / care is required: a. "Take specific gravity readings on pilot cell dai37 If specific gravity of pilot cell reading is belcw 1.200, notify the shift supervisor and take specific gravity readings on all cells. Place battery charger in use on overcharge." b. " Maintain level in each cell within tne white band indi-cator. If water is added, record the a=ount added to each cell on for= provided." i c. "ifnen battery chargers are to be removed from service l for =aintenance, log tne pilot cell readings in the Con-trol Roo= Iog. Upon returning the charger to service, log the pilot cell reading and, if below 1.200 specific gravity, place the battery on 24-hour equalizing charge." ( 5

In addition to the above, the battery voltage, current, temperat. ire and electrolyte level is recorded daily. A general obsertation of the 125V DC station system is also conducted every shift utilizing local indication. During this obsertation, the operator surveys '.ocal meter and breaker alignment for any abnor. alities. Regarding the monitoring, annunciation and surveillance of the 125V DC station system and its degree of conforaance to the current licensing criteria, the Consumers Power Company has drawn the followin6 conclusions: a. " 303-1974 Section 5 3 2(4) is complied with. Auto-matica11y initiated control room annunciation is pro-vided should the distribution system experience a ground, an overcurrent or an undervolta6e condition. In addition, frequent surveillance is conducted by the operating crew (every shift) to assess the status of the system. b. Section 5 3 3(5) is also complied with. Although indi-cation has not been specifically assi ned to the batter /, 6 bus voltage and current indicators have been locally installed. These indicators can be 'used to assess the battery supply in tne case where the battery alone is maintaining the required load. c. Section 5 3 4(5) is specifically complied with in part. Battery charger output voltage and current indication exists, however, specific instrumentation is not in-stalled to monitor charger output breaker position. Al-thou6h a specific breaker position indicator is not installed, the existing undervoltage relay serves to promptly warn the operator should the output breaker of operating charger be opened. Normally, the 125V DC bus volta 6e is maintained at 129V DC which is the char 6er's " float" voltage. This is the normal bus voltage with one charger in service, the battery " floating" on the charger output and the undervolta6e (UV) relays ener-gized. Upon opening the output breaker and disconnect-ing the charger from the bus, the battery voltage will almost i::::ediately drop to its open circuit value and will continue to drop while the battery maintains the normal Plant load of approximately 14 amps. In the matter of a few minutes, the battery volta 6e will fall to 120V DC to cause the UV relays to drop out resulting in the control room ahrm. The control room operator will immediately recognize that an undervoltage condi-tion has caused the "125V DC System Trouble" alarm since the associated control room white light will have de-energized. 6

Since this alarm occurs soon after the charger output breaker is opened, it is the opinion of the Consumers Power Co=pany that this alarm can be effectively uti-lized to detect charger. output breaker position. Consu=ers Power Cc=pany calculations conservatively show that the station battery has enough reserve capa-city to carry normal Plant load for approximately 70 minutes and still provide required service for a design basis accident. (The calculations are consi-dered conservative since a normal Plant load of 20 amps was assumed, refer to Enclosure 1.) During a test con-ducted at the Plant on 12/11/81, the operating charger's output breaker was opened while the Plant was operating at nor=al full load. The battery then carried the nor- =al Plant load of approximately 14 ar:ps for a period of 3 minutes anc 17 seconds. After tnis period of time, the UV relay-initiated control room alarm (set at 120V DC) occurred. Once the alarm was received, the charger was pro =ptly restored to service. A control room warning in less than 3-1/2 minutes is, therefore, considered to occur early enough after the charger out-put breaker is opened to allev the UV rela;/s to be used to detect breaker position. d. Given that battery charger output breaker position is effectivel,y monitored, the station battery is " tied" directly into the 125V DC bus (circuit breakers or fuses are not installed between the battery and the bus), periodic surveillance of the system is performed utilizirg local indication and continuous monitoring of certain key parameters exists, it is the opinion of the Consumers Pcwer Co=pany that the intent of IEEE 279-1971 Paragraph 4.13 (as referenced in R31.47) is complied with. C.2.2 The Reactor Depressurization System (RDS) Uninterruptible Power Supplies (UPSs) The existing =onitoring and annunciation for the UPSs is shown in Attachments 4 through 11. Similar to Section C.2.1, IEEE 308-1974 require =ents are referenced in parentheses through-out the descriptions that follow. These are the requirements to which the indication either conforms (where instrumentation is specifically called out in the standard) or provides the i l necessary infor=ation such that required monitoring (as called l out in the standard) can be performed. l shows the local UPS =onitoring equip =ent. As can be seen, the UPS features the local indication as described belev. 7

l I 1. Batterv output current - An a==eter is installed between the battery and the battery cutput breaker. This a==eter is a "0"-center type located in the 1:rierter pel (refer to =eter A2 in Attach =ent 6). (5 3 3(5)). - 2. Battery charger output current - Anrater (All) is con-nected i==ediately at the outpat of the enarger rectifier. This meter is located on the charger panel. (5 3 4(5)). 3 Battery charger output voltage - A volt =eter (V11) is con-nected to the charger output just downstrea= or the recti-fier outpat breaker.This meter is also located in the charger p el. (5 3 4(5)). 4. Inverter input current - An a==eter (A3) is connected bet-ween the inverter and the inverter's input breaker. This =eter is located in the inverter panel. 5 Inverter output current - An a==eter (A1) is connected directly at the outpat of the inverter unit. As in the case of A3, this =eter is located in the inverter panel. 6. Inverter output voltage - A volt =eter (V1) is connected directly at the output of the inverter unit. This volt- =eter is located at the inverter panel. 7 Inverter outpat frequency - This frequency =eter ( n ) is located directly at the output of the inve'rter unit and is located at the inverter panel.. As shown in Attach =ent 6, a na=ber of other local indications also exist. These indications are described in the inverter pel and charger panel identification tables shown in the attach =ent. A=ong other indications, pilot li6 hts are use:i to indicate the folicwin6 (refer to Attach =ents 7 and 8): 1. Inverter input breaker closed (ckt bkr No 1 or CB1) (5 3 2(4)). 2. Inverter output breaker closed (C32) (5 3 2(4)). 3 Battery input breaker closed (CB6) (5 3 2(4) and (5 3 3(5)). 4. DC distribution input breaker closed (CB7) (5 3 2(4) and (5 3 4(5)). 5 Iow DC voltage (at inverter input) (5 3 2(4), 5 3 3(5) and 5 3 4(5)). 6. Battery dischargi:y; (Ell) (5 3 3(5)). 7 Irrierter outpat low voltage. 6 iin - m

8. Charger AC input breaker closed (C33) (5 3 2(4) and 5 3 4(5)). 9 Chnrger DC output breaker closed (C34) (5 3 2(4) and ~ 5 3 4(5)). 10. Positive to ground (5 3 2(4), 5 3 3(5) ana 5 3 4(5)). 11. Negative to ground (5 3 2(4), 5 3 3(5) and 5 3 4(5)). Auto =atic initiated control room indication is shown in Attach-ments 5 through 11. shows control room annuncia-tor " Channel 'A' UPS Abnormal" at position 25 (a similar - annunciator for Channels B, C & D are shown at positions 49,. 73 ana 98, respectively). As shown in the attachment and usi 6 Channel A as typical, the alarm initiati9g contact is a nor-cally closed contact 400-401. (To verif'/ inputs to this alam, wires can be traced from T332 in the control room RDS panel to the 'JPS cabir.et using Attachments 5 through 11.) As can be seen in the httach=ents, Relay Contact 400-401 is =aintained nor= ally close:1 since its Relay Coil R17 is nor- = ally energized across a DC bus through a series of normily closed contacts. These series-connected nomally closed con-tacts are shown in Attach =ents 7 and 8. Any one of these series contacts,an open upon an abnor=al condition to de-energize Relay RL7 and cause closure of Centact 400-401 for tne control roo= alar =. The control room alarm will annunciate wheneven a r/ o'ne of the abnor=al conditions as given below occars. 1. Icw DC volta 6e (at i:reerter input) (5 3 2(4), 5 3 3(5) and 5 3 4'5 )). 2. Eattery discharging (311) (5 3 3(5)). 3 Inverter output low voltage (5 3 2(4)). 4 C31 breaker trip (5 3 2(4)). 5 C32 breaker trip (5 3 2(4)). l 6. C36 breaker trip (5 3 2(4) ana 5 3 3(5)). l 7 C37 breaker trip (5 3 2(4) and 5 3.4(5)). 8. Charger AC power failure (charger input supply fail or charger input breaker open) (5 3 2(4) and 5 3 4(5)). L 9 Negative to ground (5 3 2(4), 5 3 3(5) and 5 3 4(5)). 10. Positive to ground (5 3 2(4), 5,3 3(5) and 5 3 4(5)). 11. C33 Charger input treaker trip (5 3 2(4) and 5 3 4(5)). 12. C34 charger output breaker trip (5 3 2(4) and 5 3 4(5)). I 9 \\

Should the control room alarm " Channel 'A' UPS abnor=al" annanciate, an operator can be dispatched to the local UPCs to determine which condition caused the alarm. All of the above conditions have local indication en either the charger or the inverter panel. In each UPS,the charger is installed adjacenttotheinverter(seeAttachmento). Procedure ALP 1.15 " Reactor Depressurization Syste= Annunciator Tabulation," Rev 7, requires that upon receivira the control room alarm, the opera-tor check the following: 1. "Iow DC voltage" a=ber la p ext;inguished. 2. " Inverter output low voltage" red indicating lamp extinguished. 3 " Positive to ground and negative to ground" a=ber lamp extinguished. 4. Breakers closed. In addition to the conitorire and annunciation systems described, additional surveillance is conducted in the UPSs. Standard Operatirg Procedure SOP-18 " Reactor Depressurization System," Rev 11, requires battery care wnich is identical to that pre-viously described for the 125V DC station system. In addition, operators tour the local UPS control center to perform a gene-ral observation every shift and to record daily data as described for tne 125V DC station power system. It is the opinion.of tne Consu=ers Power Company that the annun-ciation and monitoring systems, as supple =ented by the sarveil-lance efforts, complies with the current licensing criteria. C.2 3 The Emergency Diesel Generator Dc System The emergency diesel generator local and remote indication is shown in Attachs nts 2, 12, 13, 14 and 15 Iocal indication is shown in Attachrent 12. As can be seen, the following local indication exists: l. A frequency meter located on the diesel generator control panel (5 3 2(4)). 2. A green indicator lamp located on the diesel control pa.el, when energized, indicates that 24V DC power is available to the diesel generator control circuits and that control switch (CS) is in the " Auto" position (it should be noted that this lamp is a dependable indication of control circuit power since Procedure SOP-28 " Station Power," Rev 7, calls for i this switch to be placed in the " Auto" position for auto start align =ent of the diesel generator). (5 3 2(4) and 533(5)) l 10

3 A red indicator la=p located on the diesel centrol panel ener-gizes whenever 24V DC pcwer is available to the diesel generator control circuits and switch "CS" is in the "Off" position. (5 3 2(4) and 5 3 3(5)). 4. An acceter at the charger to indicate char 6er output current. (5 3 4(3). 5 A voltmeter at the charger to indicate charger output voltage. (5 3 4(5)). Remote indication is provided in the control room. As can be seen in Attachment 2, alarm " Emergency Generator Engine Trouble" will annunciate upon diesel generator 24V DC starter and control circuit undervoltage. As shown, Contact UV-X enersizes the alar =. Relay UV-X is supervised by undervolta6e Relay UV which is connected across the 24V DC positive ani negative buses (refer to Attachments 13 and 14). Upon receiving this control room alar =, tne operator is required by Procedure ALP 15 " Turbine and Generator Systems Annunciator Tabulation" Rev 9 to:

1. Check the local panel to determine cause of alarm.

2. Refer to Procedures Tabulation ALPl.12 for local panel alarm corrective action. (A note in ALPl.12 instructs the operator to depress the button on the batter /' charger to start an equalizi*g char 6e to correct a 10w voltage alar =. )

3. Check battery charger en.

4. Check batteries for proper specific gravity, level and conneetions.

As in the case of the 125V DC station power system and the four UPSs, diesel Senerator battery voltage, a=ps, temperature, spe-cific gravity and electrolyte level is recorded daily. The tattery and charger is also inspected once per shift. This inspection consists of a general observation of breaker align-ment and local indication to detect any abnormalities. Given the reasons indicated below, it is the opinion of the Consu=ers Power Company that the existing indication, moni-torirg and surveillance serve to provide adequate assurance that the syste= is ready to perform its intended D1nction. 1. The battery and charger are designated exclusively to the diesel generator; they serve no other load. Also, the bat-tery, charger and generator starting and control circuits are located in the sa=e " vicinity" (in the engine room). Therefore, an elaborate distribution monitoring systes is not required. In addition, the battery (which is nor= ally not loaded) is " tied" directly into its load; no breakers or fases exist. Therefore, the charger am=eter, green indi-catin6 la=p and control room alar = provide adequate distri-bution system and battery supply indication and =cnitoring. 11

2. Althou6h only battery charger current and voltage indi-cation exists (note, " 308-1974 also requires indication of charger output breaker position) adequate monitoring of the status of the charger output fase is obtained through the use of periodic inspection of local instrumentation and the control room alarm. As previo2:17 described, when the centrol roos alarm is received, the operator is required by procedure to check the batter / charger and initiate an equalizing charge.- 1 C.2.4 The Diesel Ergine Fire Pa p DC Syste: The diesel engine fire pu. p local and remote indication is shown in Attach =ents 16 through 21. As can be seen in attachments, the following local indication is provided: 1. Status lamps (1EL and 23L) located on the fire pur.p con-- trol panel to indicate the position of battery / batter / charger output breakers 1C3 anu 2CB (see Attachments 16 and 17). (5 3 2(4)). 2. An am=eter located at the charger to indicate charger output current (see Attachcent 18). (5 3 4(5). 3 A status la:p (sal) located at the charger to indicate when the charger has been selected to manually charge either bat-tery (see Attachment 18). 4. An a==eter which monitors the output of the batter / char 5er t generator whenever the diesel fire pump is ruinire (see 9). (5 3 4(5)). As shown in Attachments 17,20 and 21, a centrol room alarm occurs whenever a loss of voltage to the control circuitry occurs. Should this alarm annunciate, the operator is instructed by Procedure ALP 1.6 "Echtards and P rotronies Fire System Annunciator Tabulation" / Rev 11, to check the condition of the batteries (ie, the battery connections and specific gravity). Relay 8CR provides the alarm. As described for the emergency diesel generator, the batter / l voltage, amps, temperature, specific gravity and electrolyte 1evel is recorded daily. In addition, the batteries' and char-l ger are inspected once per shift to detect any abnormalities. Given the reasons indicated below, it is the opinion of the Consumers Power Company that the existin6 indication, monitori 4 and surveilhnce serve to provide adequate assurance that the system is ready to perform its intended function. 1. The batteries and charger are designated exclusively to the diesel fire pump and serve no other loads. Also, the batteries and charger are located to6 ether and both are in-close proximity to the pump. Therefore, an elaborate dis-tribution monitoring system is not required. Adequate - 22 1 s

monitoring is provided by relay 8CR which senses centrol circuit voltage as provided by the bat-ter/ or battery chargers and alar =s the control room upon a loss of voltage to the control circuits. Since this relay is connected en the load side of the batter // battery charger output breakers (lCB and 203), this relay provides a valid indication of the status of the distribution systen. 2. Although specific instrumentation has not been installed for the tatteries, the condition of the battery is checked daily as previously described. In addition, the charger autonatically charges either battery whenever the battery volta 6e falls below a predetermined setpoint. Therefore, if tne control room alarm has not actuated, it is justifiable to expect that one of the two batteries is ready to perfoz= its intended function (either battery can start the ptp). 3 As previously described, battery charger output current is indicated locally. Additional indication is not necessar/ since the charger is not norm 11v in service. If the char-ger fails to charge the batteries, however, the control room alarm will occur on syste: voltage loss. As previous-ly described, the operator is required by procedure to check the batteries when tnis alarm occurs. 1 F l l l 13

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