ML20079L040
| ML20079L040 | |
| Person / Time | |
|---|---|
| Site: | Browns Ferry  |
| Issue date: | 10/28/1991 |
| From: | Zeringue O TENNESSEE VALLEY AUTHORITY |
| To: | NRC OFFICE OF INFORMATION RESOURCES MANAGEMENT (IRM) |
| References | |
| REF-GTECI-A-30, REF-GTECI-EL, TASK-A-30, TASK-OR GL-91-06, GL-91-6, NUDOCS 9111050334 | |
| Download: ML20079L040 (16) | |
Text
_..
i d
lemiemeWwAaHW(lw U%lu NoIe,das Aih. a wm OCT 2 81991 O. J %e' 7enogue w ez hue to v% i r, op.um U.S. Nuc1 car Regulatory Commi.ssion ATTH: Document Control Desk Washington, D.C.
20555 Gentlement in tne Matter of
)
Docket Hon. 50-259 Tennessee Valley Authority
)
50-260 50-296 BROWriS PERRY hUCLEAR PLANT (BFN) - UNITS 1, 2, AND 3 - RESPONSE TO GENERIC LETTER 91-06, RESOLUTION OF CENERIC ISEUE (~;l) A-30, ADPQUACY OF SAFETY-RELATED DC POWER SUPPLIES PURSUANT TO 10 CFR 50.54(f)
Reference:
NRC letter to TVA dated April 29, 1991, Resolution of Generic Issue A-30, " Adequacy of Safety-Related DC Power Supplies,"
Pursuant to 10 CPR 50.54(f) (Generic Letter 91-06)
The purpose of this letter is to respond to NRC's request for additional information.
Specifically, in the referenced letter, NRC requested written responses to the questions which resulted from their evaluation of CI A-30. to this letter provides the response to NRC's questions regarding BFN's implementation of varioun maintenance, surveillance, and inonitoring provisions for safety-related 1sC systems relative to CI A-30.
A listing of the commitments contained in thin Ictter arc provided in.
)
i 9}Q$D334 91lb2b A ADOCKOSOOg,? QU _ppR e j t%
3
- b.S. Nuclear Regulatory Commission 001 2 8 1991 If you have any questions, please contact Raul F. Baron at (205) 729-3566.
Sincerely. J8/c' f ' Sf'%- z ',/, / -0. J. Zeringue Subscribed and sworn to before me I on this MMle day offft.,_1991. /b l /Y bjrv Ra-Notary Public My Commtwon Expres W%rv4 My Commisalon Expires Enclosures cc (Enclosures): NRC hesident Inspector -Browns Ferry Nuclear Plant Poute 12, Box 637 -Athens, Alabama 35609-2000 Mr. Thierry M., Ross, Project Manager U.S. Nuclear Regulatory Commission One White Flint, North 11555 Rockville Pike Rockville, Maryland 20852 Mt. B. A. Wilson, Project Chief U.S. Nuclear Regulatory Commission Region II 101 Marietta Street, IN, Suite 2900 Atlanta, Georgia 30323 - ~
ei 4 ENCLOSURE 1 ' Response to Generic Letter 91-06, Resolution of Generic Issue A-30 " Adequacy of Safety-Related DC power Supplies" Brovns Ferry Nuclear plant (BFN) Units 1, 2 and 3 l BFN's response to each question contained in Enclosure 1 of Generic Letter 91-06 is provided below. Due to the design at BFN the unit responses are combined. The justifications and basen requested by items 5 and 9 are provided with each response, i 1. Unitt Browns Ferry Units 1. 2. and_J 2. a. The number of independent redundant divisions of Class IE or safet/-relateu DC power for the plant is 11 b. The number of functional safet>-related d!<isions of DC power necessary to attain safe shutdovn for the Unit is 19 Browns-Ferry Unit s 1, 2, and 3 have the following safety-related batteries: a. Three 250V DC Unit Batteries 1, 2, and 3 b. Five 250V DC Shutdown Board Batteries A, B, C, D, and 3EB c. Eight 125V DC Diesel Generetor Batteries A, B, C, D, 1A, 3B, 3C, and 3D Unit batteries 1, 2, and 3 have the loads far the three unita distributed among them so that redundant systems on each unit have separate power supplies. For equipmant configuration refer to enclosed drawings 0-45E710-1, 0-45E710-2. Each battery has its own dedicated battery charger, instrumentatica and battery board. The batteries share one installed switchabic spare charger. The unit -batteries account for 3 of the 11 divisions of DC power. The 250V DC shutdown board batteries A, B, c. D, and 3EB supply power to 4160V shutdown boards A, B, C, D, and 3B respectively. They also supply power to the unit I and 2 480V shutdown boards. For equipment configuration refer to enclosed drawing 0-45E710-1. -Ench battery has a dedicated charger. A pSrtable charger is provided as a spare. Operation of a 4160V shutdown board from its dedicated diesel generator requires both the diesel battery and the shutdown board bat t e ry. Shutdown batteries A, B, C, D, and 3EB combined with diesel batteries A, B, C, D and 3B respectively, form five functionally dependent groups. These groups account for five of the 11 divisions of DC power. The 125V diesel generator batter.ies A, B, C, D, 3A, 3B, 30, and 3D are esch dediceted to one diesel generator. For equipment configuration refer to enclosed drawings 0-761E580 and 3-C196C11017. Each battery has a normal and an alternate battery charger connected to the distribution panel through a manual transfer switch. The butteries supply all loads for diesel generator controls and field flashing. Batteries 3A, 30 and 3D account for the remaining three divialons of D0 power. _ _._ _._,. _ ~ _ _._.
a k pcge 2 3. Does the control room at this unit have the following separate, independently annunciated alarms and indications for each division of DC powerf a. Alarma 1. Battery disconnect or circuit breaker open? 250V DC unit batteries. No. If the battery circuit breaker is open due to an overload or fault immediate annunciation is provided in the control room. Each of the three main bank batteries (1, 2, and 3) has an annunciation vindow in the control room to indicate " Battery Board (1, 2, or 3) Breaker Tripout or Ground." Battery Boards 1, 2, and 3 alarms are on the Unit 1, 2, and 3 control boards respectively. Operating instructions control breaker position to assure proper alignment of equipment. In the unlikely event a breaker is open due to misalignment or any other reason the weekly survelliance of the battery will detect lov voltage on the battery terminals and corrective action vill be initiated. 250V DC shutdovn board batteries. N/A The batteries are solidly connected to the distribution panel bus. Thore is no disconnect device, circuit breaker or fuse. 125V DC diesel r.enerator batteries. No. The batteries are connected to the distribution panel through a fuse, but there is no disconnect or circuit breaker. If the circuit to the battery is open for any reason the weekly surveillance of the battery will detect lov voltage on tha battery terminals. 2. P>attery charger disconnect or circuit breaker open (both input AC and output DC)? 250V DC unit batteries. No. Alarms will detect input AC breaker open, but they are not separate for each division of DC power. Each battery charger han an input AC undervoltage relay. It is connected to the "250V DC Charger Failute" alarm. The charger failure alarm ir annunciated in the Unit 1 and 2 control room. The alarm is common to the chargers for batteries 1, 2, 3, and 4. Battery 4 is the non IE etation battery. l
's is Pcge 3 If the charger output DC breaker or fisconnect breaker on the battery board is open due to an overload or fault immediate annunciation is provided in the control room. These indication,. see provided by the "250V DC Charger Failure" alarm and/o* thc Bettery Board Breaker Tripout or Cround Alarm. Operating instructions control breaker position to assure proper alignment of equipment. The operating procedures provide specific instructions that vill assure the battery chargers are properly aligned and functional when they are placed in service: ite battery board vultmeters readings mbat be above 250V. The battery attmeter should be-reading zero amps. 'he ground meter should be less than 30 volts. These measure vill assure that the battery charger output circuit breaket is not misaligned. In the unlikely event the circuit from the charger to the battery board is opeu due to misalignment of the charger disconnect breaker at the battery board, the battery would eventually discharge. Under voltage relays on each RMOV board will detect this cendition. (See DC bus undervoltage below for description of the alarm.) 130v DC shutdown board batteries. No. The function is provided, but the alarms ate not separate and independently annunciated alarms for each division of DC power. Each of the sinutdown battery chargers has an input AC undervoltage relay that will operate if the AC input circuit breaker or disconnect is open. Each charger has a 1,oss of charging current relay that will operate if the DC output breaker is open. These relays annunciate in the control room. Each r-the shutdown board batteries A, B, C, and D alarms operate two "4kV Shutdown Board Battery Chargers Abnormal" vindows--one on the Unit 2 control board and one on the Unit 1 control boa:ld. Shutdown battery chstger 3B alarm operates "4kV Shutdovr. Board Battery Charger Abnormal" annunciation vindow in the Unit 3 control room. 4kV bhutdown boat ls A, B, C, and D are for unita 1 and 2. AkV shatdown board 3EB is for unit 3. Each of the windows is also initiated by-the DC system ground alarm relay for its respective ahutdown board battery. I
/6 i pcge 4, 125V DC diesel renerator batteries._No. Each of the diesel generator battery chargers has an input AC undervoltage relay that will operate if the AC input circuit breaker or disconnect is open. The chargers for batteries A, B, C, and D have a loss of charging current relay that will operate if the DC output breaker is open. These relays tanunciate on the " Diesel Generator Battery Chterger or Exhaust Fans Abnorm 11" alarm window in the control room. (See Charger Failure alarm item 6). The chargers for batteries 3A, 3B, 3C and 3D do not have charging current alarm relays. In the unlikely event the circuit from the charger to the distribution panel for batteries 3A, 3B, 3C, or 3D is open due to misalignment of the charger transfer switch at the distribution panel, the battery would eventually discharge. Loss of voltage relays in the diesel generator control circuits would detect this condition and annunciate in the control room. (See bus undervoltage below.) 3. DC System Ground? 250V DC unit batteries. No. The function is provided, but the alarms are not separate and independently annunciated alarms. Each of the three unit l batteries has a DC system ground detection scheme that alarms l on three separate windows in the unit 1, 2, and 3 control l rooms. Each of the windows is also connected to the breaker trip alarm for its respective battery board. Each battery board bus has a ground indicating meter. Routine operator inspections normally performed each shif t verify the ground I meter readings to be within acceptable limits. l 150V DC shutdown board batteries. No. The function ir provided, but the alarms are not separate and independently annunciated starms for each division of DC power. Each shutdown board bettery has a DC system ground detection relay. The relays are connected to the "AkV Shutdown Board Charger Abnormal" 3 *;m windows in the control 1 rooms. Each of the shetdown board batteries A, B, C, and D alarms operate two "4kV Shutdown Board Battery Charger Abnormal" windows--one on the Unit 2 control board and one on l the Unit 1 control board. Shutdown battery charger 3EB alarm operates the "4kV Shutdown Board Battery Charger Abnormal" annuncistion window in the Unit 3 control room. AkV shutdown boards A, B, C, and D are for units 1 and 2. 4kV shutdown board 3B is for unit 3. Each of the windo'es is also initiated by the charger alarm relays for.ts respective shutdown boards. 1 _. ~ _ _
e6 4 pcge 5, 125V DC diesel generator batterica. Yes. Each diesel generator battery has a DC system ground detection rel y connected to a separate dedicated annunciation window in the control room for the unit it serves. For example, the alarm window for diesel generator A is " Diesel Generator A Control Circuit bround." 4. DC bus under voltage? 250V DC unit batteries..lo. Eaca of the 250V RMOV boards has a bus undervoltage relay that will alarm for loss of voltage on the RMOV board bus. Also each of the 250V RMOV boards has a normal supply under voltage relay. These relays for each RMOV board are connected in parallel to a separate annunciation vindow "250V DC RMOV Board Undervoltage or Transfer" in the control room for the unit it serves. There are nine windows one for each RMOV board. The transfer is manus 1 under administrative control. i Routine operator inspectionn normally per formed each shift verify the charger voltage to be within acceptable limits. TVA will add procedures to provide for reading the battery board bus voltmeters each shift. 250V DC shutdown board batteries. No. Each shutdown board battery has undervoltage relays mounted on its associated 4kV shutdoen board. In the event of complete loss of voltage due to a blown fu.e or battery discharge these relays will annunciate on separate windows in the control room. There is one window for each shutdown board. The windows are labeled "4kV Shutdown Board Bus 250V Control Undsrvoltage." The voltage to the distribution panel bus is maintained ty the chargers. The chargers have loss of charging current relays that will detect charger failure or open circuit of the charger output to the distribution panel. Routine operator inspections normally performed each shift verify the charger voltage is within acceptable limits. Weekly surveillance of the battery will detect any low voltage on the battery terminals. TVA vill add procedures to verify the distribution panel bus voltmeter each shift.
- t. 6 p0ge 6 7
+ f 125V DC diesel _gener812I_hatteries. No. Each diesel generator battery has loss of voltage relays mounted in the diesel generator control circuits. In the event of complete loss of voltage due to a blown fuse or battery discharge these relays will annunciate on separate windows in the control room. There is one vindow for eata diesel generator. The windows are labeled " Diesel Generator Control power Off." The voltage to the distribution panel bus in maintained by the chargers. The chargers for batteries A, B, C, Fad D have loss of charging current relays that will detect charger failure or open circuit of the charger output to t*, distribution panel. Routine operator inspections normally performed each_ shift verify the charger voltage is within acceptable limits. Weekly survelliance of the battery will det ect any low -voltage on the battery terminals. TVA vill add procedures to verify the synten voltage on the distribution panel bus voltmeter each shift. This meter is mounted on the electrical control panel at the diesel generator. 5. DC bus overvoltage? 250V DC unit batterles. No. The function is prsvided, but the alarms are not separ,te and independently annunciated alarms. DC bus overvoltage alarm is provided by the charger fsilure alarm. (See battery charger failure alarm for description of operation). Since the charger is the only source of overvoltage to the system a separate alarm is not needed. Routine inspections ncrmally performed by operatore each shift verify the charger voltage to be within acceptable limits. 250V DC shutdcyn board batterica d,, The function is provided, but the alarms are not separate and independently annunciated alarms for each divicion of DC power. DC bus overvoltage alarm is provided by the charger failure alarm. See battery charger f ailure alarm for description of operation. Since the charger is the only source of overvoltage to the system, a separate alarm is not needed. ~_
e6 l Page 7 Routine operator inspections normally performed each shift verify the charger voltage to be within acceptable limits. 125V DC diesel e.enerator bg11tries. No. Routine operator inspections normally performed each shift verify the charger voltage to be within acceptable limits. 6. Battery charger failure? 250V DC unit batteries. No. The charger for each of the three main bank batteries has a charger failure alarm circuit with an AC input undervoltage relay, DC output undervoltcge relay, DC output overvoltage relay and output breaker trip alarm. These alarm circuits are connected in parallel with the charger failure alarm from station battery No. 4 charger. The alarm circu!t operates the "250V DC Charger Failure" annunciator windows in the Unit 1 and 2 control room. The undervoltage-rel:-ys are set below the battery voltage, therefore, they will not detect a charger failure until the batteries have been discharged. Routine inspections normally performed by operators each shift verify the charger voltrge to be within acceptatic limits. 250V DC sht lovn board battertea. No. The function is provided, but the alarms are not separate end independently annunciated alarms for each division of DC control power. Each charger has a charger failure alarms circuit. The circuit has relays to detect loss of input AC supply voltage, undervoltage on the charger output, and loss of charging current. Each battery has a ground detection alarm relay. Ground detection is also connected to the charger failure alarm circuit. Each of the shutdown board batteries (A, B, C, or D) alarms operate two "4kV Shutdown Board Battery Charger Abnormal" vindows--one on the Unit 2 control board and one on the Unit I control board. Shutdown battery charger 3B alarm operates l the "4kV Shutdown Board Battery Charger Abnormal" annunciation wJndow in the Unit 3 control room. 4kV shutdown boards A, B, C, and D are for units 1 and 2. 4kV shutdown board 3B is for unit 3. l l The undervoltage relays are set below the battery voltage, therefore, they will not detect a charger failure until the battery has been discharged. Routine operator inspections normally performed er.ch shift verify the charger voltage is within acceptable limits.
L j,
- +
Page t, 4 125V DC diesel renerator batLgries..t@2 The function is provided, but the alarms are not separate and independently annunciated alarms for each division of DC control power. Tbe charger for each diesel generator battery has a charger failure alarm circuit. The circuito for each diesel generator batteries A, B, C, and D have relays to detect losa of input AC supply voltage, and loss of charging current. The circuits for diesel generator batteries 3A, 3B, 3C, and 3D have relays to detect loss of input supply voltage, and charger output undervoltage. The charger alarms and the diesel generator exhaust fan failure alarms are connected in parallel to form a common alarm fer each diesel generator. This alarm " Diesel Generator Exhaust Fan or Battery Charger Abnormal," annunciates in the main control room. There is one annunciation window for each diesel generator. Diesel A, B, C, and D annunciation windows are in the Unit I and 2 control room. Diesel 3A, 3B, 3C, and 3D annunciation windown are in the unit 3 c/ atrol room. Routine operaise inspections normally performed each shift verify the charger voltage in within acceptable limits. 7. Battery discharget 250V DC unit batteries. No. Routine operator inspections, normally performed each shift, verify the charger voltmeter and ammeter readings are within i acceptable limits. Wita the exception of an open circuit from the charger to the bus, these readings will detect an overload or undervoltage condition that could result in a battery discharge. TVA will add procedures to provide for reading the bus voltmeters and battery ammeters each shift. 250V DC shutdown batteries. No,. Routine operator inspections normally performed each shift verify the charger voltmeter and ammeter readings are within acceptable limits. Vith the exception of an open circuit from the charger to the bus, these readings will detect an overload or undervoltage condition that could result in a battery discharge. TVA vill add procedures to provide for reading the bus voltmeters and battery ammeters each shift. -e .rm n.--.c. .+c _.., s _,.,_m., ,m.,.__...,.,,y,, ,,.,,m. ,p.,-, .,,,y y
l ~ e.. page 9 f 0 125V DC diesel (_enerator batteries. No. Routine operator inspections normally performed each shift verify the charger voltmeter and ammeter readings are within accei 'le limita. With the exception of an open circuit from the charger to the bus, these readings vill detect an overload or undervoltage condition that could reeult in a battery discharge. TVA vill add proceduren to provide for reading the bus voltmeters and battery ammeters each shif t. These meters are on the electrical control panel at the diesel generator. b. Indications 1. Battery float charge current? 1}0V DC unit batteries. No. There are battery charging current meters in the control room, but they are not sensitive enough to read the float charge on the batteries. The weekly surveillance of the battery specific gravity and cell voltage vill verify the battery is fully charged. 250V DC shutdown board batteries. Noi The weekly surveillance of the battery specific gravity and cell voltage vill verify the battery is fully charged. 125V DC diesel Reneratar batteries. No. The weekly surveillance of the battery specific gravity and cell voltage vill verity the battery is fully charged. 2. Battery circuit output current? 250V DC unit batteries. Ng2 Although provided separately, no indication of the cumulative chstger and battery output i is ava lable. Ammeters are provided in-the control room to monito* battery current (both discharge and charge) for each battery. Ammeters are provided locally at the chargers to monitor charger output current. 250V DC-phutdown batteries. No. A battery ammeter is provided on the local distribution panel and a charger ammeter is provided on the chargers. The Akv and 480V shutdown boards supplied from these batteries have loss of voltage alarm relays that vill verify continuity of the circuit to these board 9
. - ~
- t. 6 pcse 10 125V DC diesel renerator batteries. No.
+ A battery ammeter is provided on the local distribution panel and a charger ammeter is provided on the chargers. The diesel generator control circuits supplied from these batteries have loss of voltage alarm relays that will verify continuity of the circuit to these boards. I 3. Battery discharge? 250V DC unit battericJ. Yes. 250V DC shutdown board batteries. Not A battery ammeter is provided on the local distribution panel and a charger ammeter is provided on the charger. 125V DC diesel rencrator batteries. Na2 A battery ammeter is provided on the local diesel control panel and a charger ammeter is provided on the charger. 4 Bus voltaget 250V DC unit batttries. Yes. 250V DC shutdown board batterieb. Mai A voltmeter is provided on the local distribution board bus, and a voltmeter is provided on the chargers. 125V DC diesel renerator batteries. No. A voltmeter is prov.ided on the local diesti control panel, and a voltmeter is provided on the chargers, c. Does the unit have written procedures for response to the above alarms and indications? All of the above items are not currently addressed by written procedures at BFN. Written procedures will be prepared to respond to the alarms and indications listed in question 3. 4. Does this unit have indication of bypassed and inoperable status of circuit breakers or other devices that can be used to disconnect the battery and battery charger from its DC bus and the battery charger from its AC power source during maintenance or testing? 250V DC unit batteries. No.2 l Maintenance and testing for the batteries and chargers is pe: formed under procedural control. Operating instructions for removing and returning equipment to service specify breaker alignment and checks for normal operation.
.s 4 page 11 210V DC shutdown batteries. No. Maintenance and testing for the batteries and chargers is performed under procedural control. Operating instructions for removing and returning equipment to service specify breaker alignment and checks for normal operation. 125V DC diesel r.enerator batteries. No. Maintenanti sud testing for the batteries and chargers is performed under procedural control. Routine operator inspections normally performed each shift verify the charger voltage to be within acceptable limits. 5. If the answer to an/ part of question 3 or 4 is no, then provide information justifying the existing design features of the facilities safety related DC systems. The information justifying the existing design features of the facilities safety DC systems is provided above with each no response. 6. (1) llave you conducted a review of meintenance and testing activities to minimite the potential for human error causing more than one DC division to be unavailable? Ira (2) Do plant procedures prohibit maintenance or testing on redundant DC divisions at the same time? Igg 7. Are mainteaance, surveillance and test procedures regarding station batteries conducted routinely at this plant? Specifically a. At least once per 7 days are the following verified to be within acceptable limits: 1. pilot cell electrolyte level? Ifg Electrolyte level is checked for all cells. 2. Specific gravity or charging current? Ira pilot cell specific gravity is recorded. 3. Float voltage? Ira 4. Total bus voltage on float charge? 123 5. physical condition of all cella? Ira b. At least once per 92 days, or within 7 days after a battery discharge, overcharge, or if the pilot cell readings are outside the 7-day surveillance requirements are the following verified to be within acceptable limits:
et page la The following (7.b.1 thru 7.b.6) are answered YES based on the fact that they are performed as indicated except for a battery overcharge. At this time, BFN's Technical Specifications do not provide a limit for battery overcharge condition. Battery voltages are recorded veckly and reviewed by the cognizant engineer; therefore, any significant overvoltage vould be tvaluated on a case by case basis. 1. Electrolyte level of each cell? Ira 2. The average opecific gravity of all cells. Ltg Average specific gravity of all cells is not recorded, llowever, the specific gravity of each cell is recorded and verified to be not lese than 1.200. The battery manufacturer has stated that as long as specific gravity is 1.200 or greater, no equalizing charge is required. 3. The specific gravity of each cell? Ita 4. The average electrolyte temperature of a representative number of cellst fra Electrolyte temperature of each cell is recorded and verified to be within an upper and lover limit. Also, if the "an found" cell temperature difference between the higheut and lowest cell is greater than 5 degrees F a work request is issued to investigate. 5. The float voltage of each cell? Xia 6. Visually inspect or measure resistance of terminals and connectors (including the connectors at the DC bus)? Xia All battery connections ere visually inspected for general cleanliness and corrosion buildup on a weekly basis. c. At least every 18 months are the fc11owing verified 1. Low resistance of each connection (by test)? Ira Resistance readings for each battery are performed on an annual basis. 2. Physical condition of the battery? Ira Physical condition of each battery is verified on an annual basis. The following (7.c.3 thru 7.c.5) are answered NO based on the fact that they are performed on a 24-month frequency rather than an 18-month frequency. Also, at this time, Browns Ferry does not perform service testing as it is not required by the Technical Specifications. However, the operational features cited for each item are included in normally scheduled capacity testing. l 1
r. Pcce 13 3. Battery charger capability to deliver rated ampere output to the DC bt's? H2 Battery charger capability to deliver rated ampere output to the DC bus to proven during battery recharge following scheduled capacity testing or by load test (normally performed on alternate chargers). 4. The capability of the battery to deliver its design duty cycle to the DC bust H2 The existing battery discharge test is more severe than the battery design duty cycle with the exception of initial peak momentary load. 5. Each individual cell voltage is within acceptable limits during the service test? H2 Individual cell voltages are recorded and determined to be within acceptable limits during scheduled capacity testing. d. At least every 60 months, is capicity of each battery verified by performance of a discharge test? Ira Battery discharge testing is performed every 24 months unless the requirements of 7.e are met. At least annually, is the battery capacity of each battery verified by e. performance discharge test, if the battery shows signs of degradation or has reached 85% of the expected service life? 1ra a 8. Does this plant have operational features such that following loss of one safety-related DC power supply or bust a. Capability is maintained for ensuring continued and adequate reactor cooling? Xia b. Reactor cooling system integrity and isolation capability are maintained? 1ra c. Operating procedures, instrumentation (including indicators and annunciators), and control functions are adequate to initiate systems as required to maintain adequate core cooling? 113 9. If the answer to any part of question 6, 7, or 8 is no, then provide your basis for not performing the maintenance, surveillance and tent procedures described and/or the bases for not including the operational teature cited. The basis for each "No" response is provided above. w-________________________________________.___________
t 6 e, ENCLOSURE 2 LISTING OF COMMITMENTS 1. TVA vill add prccedures to provide for reading the bus (2$0V DC unit batteries) voltmeters and battery ammeters each shift. 2. TVA vill add procedures to provide for reading bus (2$0V DC shutdown board batteries) voittneters and battery ammeters each shif t. 3. TVA vill add procedures to provide for reading on the bus (125V DC diesel generator batter 138) voltmeters and battety ammeters each shift. 4. Written procedures will be prepared to respond to the alarms and indications listed in question 3. i - - -. -}}