ML20095F067
| ML20095F067 | |
| Person / Time | |
|---|---|
| Site: | Sequoyah  |
| Issue date: | 08/20/1984 |
| From: | TENNESSEE VALLEY AUTHORITY |
| To: | |
| Shared Package | |
| ML20095F050 | List: |
| References | |
| TVA-SQN-TS-57, NUDOCS 8408270162 | |
| Download: ML20095F067 (30) | |
Text
.._,.
~; g,
- ~= ;
~
~. :4,:-
g-4:
ENCLOSURE 1 1-
_7 I
d, PROPOSED TECHNICAL' SPECIFICATIONS 1
.SEQUOYAH h0 CLEAR PLANT--
UNITS 1 AND 2
-3 i
TVA-SQN-TS-57 i
S
.,4 8408270162 840820 PDR ADOCK 05000327 P
PDR y
l
'k:
s 3:
1
ELECTRICAL POWER SYSTEMS'
.3/4.8.2 ONSITE POWER DISTRIBUTION SYSTEMS LA.C. DISTRIBUTION OPERATING LIMITING CONDITION FOR OPERATION
'3.8.2.1 The following A.C.' electrical boards shall be OPERABLE and energized with. tie breakers open between redundant boards:
6900 Volt Shutdown Board 1A-A 56900 Volt Shutdown Board. 18-8 6900 Volt Shutdown Board 2A-A 6900 Volt Shutdown Board 28-B 480 Volt Shutdown Board 1Al-A 480 Volt Shutdown Board 1A2-A 2480 Volt Shutdown Board 181-8 480 Volt Shutdown Board 182-8 480 Volt Shutdown Board 2Al-A 480 Volt Shutdown Board 2A2-A 480 Volt Shutdown Board 281-B 480 Volt Shutdown Board 282-8 120 Volt A.C. Vital Instrument Power Board Channels I-I and 2-1 energized from inverters 1-1 and 2-I connected to D.C. Channel I*.#
-120 Volt A.C. Vital Instrument Power Board Channels 1-II and 2-II energized from inverters 1-II and 2-II connected to D.C. Channel II*.#
120 Volt A.C. Vital Instrument Power Board Channels 1-III and 2-III energized from inverters 1-III and 2-III connected to D.C.' Channel III*.8 120 Volt A.C. Vital Instrument Power Board Channels 1-IV and 2-IV energized from inverters 1-IV and 2-IV connected to D.C. Channel IV*I.
APPLICABILITY: MODES 1, 2, 3 and 4.
ACTION:
With less than the above complement of A.C. boards OPERABLE and energized, a.
restore the inoperable boards to OPERABLE status within 8 hours9.259259e-5 days <br />0.00222 hours <br />1.322751e-5 weeks <br />3.044e-6 months <br /> or be in at least HOT STAND 8Y within the next 6 hours6.944444e-5 days <br />0.00167 hours <br />9.920635e-6 weeks <br />2.283e-6 months <br /> and in COLD 'SHUTOOWN within the following 30 hours3.472222e-4 days <br />0.00833 hours <br />4.960317e-5 weeks <br />1.1415e-5 months <br />, b.
With one inverter inoperable, energize the associated Vital Instrument Power Board within 8 hours9.259259e-5 days <br />0.00222 hours <br />1.322751e-5 weeks <br />3.044e-6 months <br />; restore the inoperable inverter to OPERABLE
~ status within 24 hours2.777778e-4 days <br />0.00667 hours <br />3.968254e-5 weeks <br />9.132e-6 months <br /> or be in at least HOT STANDBY within the next 6-hours and in COLD SHUTDOWN within the following 30 hours3.472222e-4 days <br />0.00833 hours <br />4.960317e-5 weeks <br />1.1415e-5 months <br />.
SURVEILLANCE REQUIREMENTS
'4.8.2.1 The specified A.C. boards and inverters shall be determined OPERABLE and energized with tie breakers open between redundant boards at least ~once per 7 days by verifying correct breaker alignment and indicated voltage on the busses.
"Two inverters may be disconnected from their D.C. source for up to 24 hours2.777778e-4 days <br />0.00667 hours <br />3.968254e-5 weeks <br />9.132e-6 months <br /> for the purpose of performing an equalizing charge on their associated battery bank provide i
(1) the vital instrument power board is OPERABLE and energized, and (2) the vital instrument power boards associated with the other battery banks are OPERABLE and energized from their respective Inverters connected to their respective D.C. source.
o#D.C. Channel V may be substituted for any one channel of channels I-IV.
lSEQUOYAH - UNIT I 3/4 8-9 p
n l
l J
f E.LECTRICAL POWER SYSTEMS A.C. DISTRIBUTION - SHUTOOWN
-LIMITING CONDITION'FOR O'ERATION-P 3.8.2.2 As a' minimum, the following A C. electrical boards'and inverters
.shall be OPERABLE and energized:
- 2 - 6900 volt shutdown boards, either lA-A and 2A-A or 18-8 and 28-8, i
4
-~480 volt shutdown boards associated with the required OPERABLE 6900
' volt' shutdown boards, 2-120 volt A;C. vital _ instrument power boards either Channels I and III or Channels II and IV energized from their respective inverters connected to their respective D.C. battery. banks *, and 480 volt
~
shutdown boards.
APPLICABILITYi MODES 5 and 6.
ACTION:
With less than the above complement of A.C. boards and inverters OPERABLE and
-. energized, establish CONTAINMENT INTEGRITY within 8 hours9.259259e-5 days <br />0.00222 hours <br />1.322751e-5 weeks <br />3.044e-6 months <br />.
SURVEILLANCE REQUIREMENTS 4.8.2.2 The specified A'.C. boards and inverters shall be determined 0PERABLE and energized at least once per 7 days by verifying correct breaker alignment and indicated voltage on the bus.
- Any one of the inverters clay be connected to D.C. Battery Bank V.
SEQUOYAH - UNIT 1 3/4 8-10
/.
J i
=
ELECTRICAL POWER SYSTEMS
'D.C.
DISTRIBUTION - OPERATING
' LIMITING CONDITION FOR OPERATION 3.8.2.3 The following D.C.' vital battery channels shall be ~ energized and OPERABLE:
CHANNEL I Consisting of 125 -volt D.C. board No. I, 125 volt.D.C.
battery bank No. I*and a full capacity charger.
CHANNEL ~II Consisting of 125, volt D.C. board No. II,125 - volt D.C.
battery bank No. II,.and a full capacity charger.
CHANNEL III Consisting of 125 volt D.C. board No. III, 125 - volt D.C.
battery bank'No. III* and a full capacity charger.
CHANNEL IV Consisting of 125 - volt D.C. board No. IV, 125 - volt D. C.
battery bank No. IV* and a full capacity charger.
APPLICABILITY:. MODES 1, 2, 3 and 4.
ACTION:
With one 125-volt D.C. board inoperable, restore the inoperable a.
board to OPERABLE status within 2 hours2.314815e-5 days <br />5.555556e-4 hours <br />3.306878e-6 weeks <br />7.61e-7 months <br /> or be in at'least HOT STANDBY within the next 6 hours6.944444e-5 days <br />0.00167 hours <br />9.920635e-6 weeks <br />2.283e-6 months <br /> and in COLD SHUT 00WN within the following 30 hours3.472222e-4 days <br />0.00833 hours <br />4.960317e-5 weeks <br />1.1415e-5 months <br />.
b.
With one 125-volt D.C. battery bank and/or its charger inoperable, restore the inoperable battery bank and/or charger to OPERABLE status within 2 hours2.314815e-5 days <br />5.555556e-4 hours <br />3.306878e-6 weeks <br />7.61e-7 months <br /> or be in at least HOT STANDBY within the next 6 hcurs and in COLD SHUTDOWN within the following 30 hours3.472222e-4 days <br />0.00833 hours <br />4.960317e-5 weeks <br />1.1415e-5 months <br />.
- D.C. Battery Bank may be substituted for any other Battery Bank as needed.
SEQUOYAH - UNIT 1 3/4 8-11 l
c,
.a sl ELECTRICAL POWER SYSTEMS SURVEILLANCE REQUIREMENTS 4.8.2.3.1 Each D.C. bus train shall be determined OPERABLE and energized with tie breakers open between redundant busses at least once per 7 days by verifying
' correct breaker alignment, indicated power availability from the charger and
^ battery, and voltage on the bus of greater than or equal.to 125 volts.
4.8.2.3.26 Each 125-volt battery bank and charger shall be demonstrated OPERABLE:
a.
At least once per 7 days by:
1.
Verifying that the parameters in Table 4.8-2 meet the Category A limits, and 2.
Verifying total battery terminal voltage is greater than or equal to 129-volts on float charge.
b.
At least once per 92 days and within 7 days af ter a battery discharge
- (battery terminal voltage below 110-volts), or battery overcharge (battery terminal voltage above 150-volts), by:
1.
Verifying that the parameters in Table 4.8-2 meet the Category 8
- limits, 2.
Verifying there is no visible corrosion at either terminals or connectors, or the connection resistance of these items is less than 150 x 10 6 ohms, and 3.
Verifying that the average electrolyte temperature of 6 connected cells is above 60 F.
c.
At least once per 18 months by verifying that:
1.
The cells, cell plates and battery racks show no visual indication of physical. damage or abnormal deterioration, 2.
The cell-to-cell and terminal connections are clean, tight and coated with anti-corrosion material, 3.
The resistance of each cell-to-terminal connection is less than or equal to 150 x 10 6 ohms, and 4.
1he battery charger will supply at least 150 amperes at 125 volts for at'least 4 hours4.62963e-5 days <br />0.00111 hours <br />6.613757e-6 weeks <br />1.522e-6 months <br />.
- This surveillance includes battery bank V, but not charger V.
SEQUOYAH - UNIT 1 3/4 8-12 i
/
e.
'L__
ELECTRICAL POWER SYSTEMS
- D.C. DISTRIBUTION - SHUTDOWN LIMITING CONDITION FOR OPERATION 3.8.2.4 As a minimum, the following 0.C. electrical equipment and boards shall be energized and OPERABLE:
2-125 volt D.C. boards either I and III or 11 and IV, and 2* - 125-volt battery banks and chargers, one associated with each operable D.C. board APPLICABILITY: MODES 5 and 6.
ACTION:
With less than the above complement of D.C. equipment and board OPERA 8LE, establish CONTAINMENT INTEGRITY within 8 hours9.259259e-5 days <br />0.00222 hours <br />1.322751e-5 weeks <br />3.044e-6 months <br />.
SURVEILLANCE REQUIREMENTS 4.8.2.4.1 The above requited 125-volt 0.C. vital battery boards shall be determined OPERABLE and energized at least once per 7 days by verifying correct breaker alignment and indicated power availability with an overall battery voltage. of greater than or equal to 125 volts.
4.8.2.4.2 The above required 125-volt 0.C. vital battery banks and chargers shall be demonstrated OPERABLE per Surveillance Requirement 4.8.2.3.2.
- D.C. Battery Bank V may be substituted for any other Battery Bank.
o SEQUOYAH - UNIT 1 3/4 8-14
n TABLE 3.3-11 FIRE DETECTION INSTRUMENTS
- l. '
6 Fire Minimum Instruments Operable p
-Zone Instrument Location Ionization Photoelectric-Thermal Infrared
?:
[
235 Ctr1. Rod Dr. Eqpt. Rm. El. 759 4
236 Ctr1. Rod Dr. Eqpt. Rm. E1. 759 4
237 Mech. Eqpt.'Rm. El. 749 1
238 Mech. Eqpt. Rm. El. 749 1
241' 480-V XFMR Rm. lA El. 749 3
242.480-V XFMR Rm. IA El. 749 3
l' 243 480-V XFMR Rm. 1B El. 749.
3 244 480-V XFMR Rm. 1B El. 749 3
249 125-V Batt. Rm. I El. 749 1
250 125-V Batt. Rm. I El. 749 1
251 125-V Batt. Rm. II El. 749 1
252 ~125-V Batt. Rm. II El. 749 1
l 253 125-V Batt. Rm. III El. 749 1
254 125-V Batt. Rm. III El. 749 1
255 125-V Batt. Rm. IV El. 749 1
256 125-V Batt. Rm. IV E1. 749 1
257 480-V Bd. Rm. IB El. 749 4
258 480-V Bd. Rm. 1B El. 749 4
259 480-V Bd. Rm. lA El. 749 4
l 260 480-V Bd. Rm. lA El. 749 4
153 Add. Eqpt. Bldg. E1. 740.5 4
l 155 Refuel Rm. El. 734 19 l
156 RB Access Rm. El. 734 2
157 RB kcess Rm. El. 734 2
160 SG Blwdn. Rm. El. 734 4
427 125V Batt. Rm. V E1. 749 2
428 12SV Batt. 101. V El. 749 2
SEQUOYAH - UNIT 1-3/4 3-59 c
/
c L
.A
YT~
1 ELECTRICAL POWER SYSTEMS L3/4.8.2 ONSITE POWER DISTRIBUTION SYSTEMS A.C.-DISTRIBUTION - OPERATING LIMITING CONDITION FOR OPERATION
'3;8.2.1 The following A.C. electrical boards and inverters shall be OPERABLE and energized with tie breakers open between redundant boards:
6900 Volt Shutdown Board 1A-A 6900 Volt Shutdown Board IB-B 6900 Volt Shutdown Board 2A-A
~6900 Volt Shutdown Board 28-8
.480 Volt Shutdown Board 1Al-A 480 Volt Shutdown Board 1A2-A 480 Volt Shutdown Board 181-8 480 Volt Shutdown Board 182-8 480 Volt Shutdown Board 2Al-A 480 Volt Shutdown Board-2A2-A 480 Volt Shutdown Board 281-B 480 Volt Shutdown Board 282-B 120 Volt A.C. Vital Instrument Power Board Channels 1-I and 2-I energized from inverters 1-1 and 2-I connected to D.C. Channel I*.#
120 Volt A.C. Vital Instrument Power Board Channels 1-II and 2-II energized from inverter 1-II and 2-II connected to D.C. Channel II*f 120 Volt A.C. Vital Instrument Power Board Channels 1-III and 2-III energized from inverter 1-III and 2-III connected to D.C. Channel III*f 120 Volt A.C. Vital Instrument Power Board Channels 1-IV and 2-IV energized from inverter 1-IV and 2-IV connected to D.C. Channel IV*f APPLICABILITY: MODES 1, 2, 3 and 4.
ACTION:
With less than the above complement of A.C. boards OPERABLE and energized, a.
restore the inoperable boards to OPERABLE status within 8 hours9.259259e-5 days <br />0.00222 hours <br />1.322751e-5 weeks <br />3.044e-6 months <br /> or be in at least HOT STANDBY within the next 6 hours6.944444e-5 days <br />0.00167 hours <br />9.920635e-6 weeks <br />2.283e-6 months <br /> and in COLD SHUTDOWN within the following 30 hours3.472222e-4 days <br />0.00833 hours <br />4.960317e-5 weeks <br />1.1415e-5 months <br />.
b.
With one inverter inoperable, energize the associated Vital Instrument Power Board within 8 hours9.259259e-5 days <br />0.00222 hours <br />1.322751e-5 weeks <br />3.044e-6 months <br />; restore the inoperable inverter to OPERABLE status within 24 hours2.777778e-4 days <br />0.00667 hours <br />3.968254e-5 weeks <br />9.132e-6 months <br /> or be in at least HOT STANDBY within the next 6 hours6.944444e-5 days <br />0.00167 hours <br />9.920635e-6 weeks <br />2.283e-6 months <br /> and in COLD SHUTDOWN within the following 30 hours3.472222e-4 days <br />0.00833 hours <br />4.960317e-5 weeks <br />1.1415e-5 months <br />.
SURVEILLANCE REQUIREMENTS 4.8.2.1 The specified A.C. boards and inverters shall be determined ~0PERABLE and energized with tie breakers open between redundant boards at least once per 7 days by verifying correct breaker alignment and indicated voltage on the busses.
"Two invertes may be disconnected from their D.C. source for up to 24 hours2.777778e-4 days <br />0.00667 hours <br />3.968254e-5 weeks <br />9.132e-6 months <br /> for the purpose of performing an equalizing charge on their associated battery bank provided (1) the vital instrument power board is OPERABLE and energized, and (2) the vital instrument power boards associa'.ed with the other battery banks are OPERABLE and energized from their respective inverters connected to their respective D.C. sources.
- D.C. Chanel V may be substituted for any one channel of channels I-IV.
SEQUOYAH - UNIT 2 3/4 8-10
y ELECTRICAL POWER SYSTEMS-A.C. DISTRIBUTION - SHUTDOWN LIMITING CONDITION FOR OPERATION 3.8.2.2 As a minimum, the following A.C. electrical boards and inverters shall be OPERABLE and energized:
2' - 6900 volt shutdown boards, either l A-A and 2A-A or 18-8 and 28-B, 4-480 volt shutdown boards associated with the required OPERABLE 6900 volt shutdown boards,-
2-120 volt A.C. vital instrument power boards either Channels I and connected to their respective D.C. battery banks,* pective inverters III or Channels II and IV energized from their. res and 480 volt shut-down boards.
APPLICABILITY: MODES 5 and 6.
ACTION:
With less than the above complement of A.C. boards and inverters OPERABLE and energized, establish CONTAINMENT INTEGRITY within.8 hours9.259259e-5 days <br />0.00222 hours <br />1.322751e-5 weeks <br />3.044e-6 months <br />.
SURVEILLANCE REQUIREMENTS 4.8.2.2 The specified A.C. boards and inverters shall be determined GPERABLE and energized at least once per 7 days by verifying correct breaker alignment and indicated voltage on the bus.
- Any one of the inverterb may be connected to D.C. battery bank V.
SEQUOYAH - UNIT 2 3/.4 8-11 i
J
m l
ELECTRICAL POWER SYSTEMS f
.D.C. DISTRIBUTION - OPERATING F
LIMITING CONDITION FOR OPERATION 3.8.2.3 The following 0.C. vital battery channels shall be OPERABLE and energized:
L CHANNEL I Consisting of 125 volt 0.C. board No. I,125 - volt 0.C.
battery bank No. I and a. full capacity charger.
CHANNEL II Consisting of 125 - volt D.C. board No. II,125 - volt D.C.
battery bank No. II*, and a full capacity charger.
CHANNEL III Consisting of 125 - voit 0.C. board No. III, 125 - volt 0.C.
battery bank No. III* and a full capacity charger.
CHANNEL IV Consisting of 125 - volt 0.C. board No. IV, 125 volt D. C.
battery bank No. IV* and a full capacity. charger.
APPLICABILITY: MODES 1, 2, 3 and 4.
ACTION:
With one 125-volt 0.C. board inoperable or not energized, restore a.
the inoperable board to OPERABLE and energized status within 2 hours2.314815e-5 days <br />5.555556e-4 hours <br />3.306878e-6 weeks <br />7.61e-7 months <br /> or be in at least HOT STANDBY within the next 6 hours6.944444e-5 days <br />0.00167 hours <br />9.920635e-6 weeks <br />2.283e-6 months <br /> and in COLD SHUTOOWN within the following 30 hours3.472222e-4 days <br />0.00833 hours <br />4.960317e-5 weeks <br />1.1415e-5 months <br />.
b.
With one 125 volt 0.C. battery bank and/or its charger inoperable or not energized, restore the inoperable battery bank and/or charger to OPERABLE and energized status within 2 hours2.314815e-5 days <br />5.555556e-4 hours <br />3.306878e-6 weeks <br />7.61e-7 months <br /> or be in at least HOT STANDBY within the next 6 hours6.944444e-5 days <br />0.00167 hours <br />9.920635e-6 weeks <br />2.283e-6 months <br /> and in COLD SHUTOOWN within the following 30 h9urs.
, *D.C. Battery Bank V may be substituted for any
.S'URVEILLANCE REQUIREMENTS l
4.8.2.3.1 Each 0.C. bus train shall be determined OPERABLE and energized with tie breakers open between redundant busses at least once per 7 days by verifying correct breaker alignment, indicated power availability from the charger and battery, and voltage on the bus of greater than or equal to 125 volts.
4.8.2.3.2** Each 125-volt battery bank and charger shall be demonstrated OPERABLE:
a.
At least once per 7 days by:
1.
Verifying that the parameters in Table 4.8-2 meet the Category A limits, and
- 'Ihis surveillance incitxles Battery Bank V, but not charger V.
l SEQUOYAH - UNIT 2 3/.4 8-12 i
'k-
E:
(
~ ELECTRICAL POWER SYSTEMS 0.C. DISTRIBUTION - SHUTDOWN' LIMITING CONDITION FOR OPERATION 3.8.2.4 As a minimum, the following 0.C. electrical equipment and boards shall be and OPERABLE and energized:
2-125-volt 0.C. boards either I and III or II and IV, and 2-125-volt battery banks and chargers, one associated with each operable O.C. board APPLICA8II.ITY: MODES 5 and 6.
ACTION:
With less than the above complement of 0.C. equipment and board OPERABLE and energized, establish CONTAINMENT INTEGRITY within 8 hours9.259259e-5 days <br />0.00222 hours <br />1.322751e-5 weeks <br />3.044e-6 months <br />.
- D.C. Battery Bank V may be substituted for any other Battery Bank.
SURVEILLANCE REQUIREMENTS 4.8.2.4.1 The above required 125-volt 0.C. Vital battery boards shall be determined OPERABLE and energized at least once per 7 days by verifying correct
[
breaker alignment and voltage on the board with an overall battery voltage of greater than or equal to 125 volts, 4.8.2.4.2 The above required 125-volt 0.C. vital battery banks and chargers shall be demonstrated OPERABLE per Surveillance Requirement 4.8.2.3.2.
l l
- D.C. Battery Bank V may be substituted for any other Battery Bank.
SEQUOYAH - UNIT 2 3/4 8-15
/
a t
IABLE 3.3-11 (Cont inued) m$
Ej flRE DETECTION INSTRUMINTS-s
=-
FIRE MINIMUM INSTRUMENTS OPERABLE gi -
ZONE INSTRUMENT LOCATION lonization Photoelectric.
Thermal Infrared
~
--4 241 480-V.XFMR Rs. lA, El. 749 3
242 480-V XIMR Rm. IA El. /49 3
243 480-V XIMR Rm. 18, El. 749 3
244 480-V XIMR Rm. IB, El. 749 3
245 480-V XillR km. 2A, El. 749 3
246 480-V XIMR Rs. 2A, El. 749 3
247 480-V XIMR Re. 28, El. 749 3
248 4HO-V XtMR Rm. 28, El. 749 3
249 125-V Batt. Rm. 1, El. 749 1
250 125-V Batt. Rs. I, El. 749 1
gg 251 125-V Batt. Rs. II, El. 749 1
- =
252 125-V Batt. Rs. II, El. 749 1
ya 253 125-V Batt. Ra. 111. El. 749 1
as
-254 125-V Batt. Hm. Ill, El. 749 1
255 125-V ilatt. Hm. IV, El. 749 1
256 125-V Batt. Rm. IV, El. 749 1
257 480-V Bd. Rm. IB, El. 749 4
258 480-V lid. Hm. IB, El. 749 4
259 480-V Bd. Pm. IA, El. 749 4
260 480-V Bd. Hm. IA, El. 749 4
261 480-V Ld. Rm. 2A, El. 749 4
262 480-V Bd. Rm. 2A, El. 749 4
263 480-V Bd. Rm. 28 El. 749 4
264 480-V Bd. Hm. 2B, El. 749 4
269 Computer Rm. El. 685 4
270 Computer Rm. El. 685 4
271 Aux. Inst. Rm. El. 685 8
272 Aux. Inst. Rm. El. 685 9
273 Computer Hm. Corridor, El. 685 3
276 Intake Pump Sta. El..690 & 670.5 15 277 LRCW l' ump Sta. El. 704 21 427 125-V Batt. Rm. V El. 749 2
428 125-V Batt. Rm. V El. 749 2
g
'De:cription of the Proposed Electrical Power Systen for the 125-Volt Fifth Vital Battery System 1.0 -PURPOSE One of the limiting conditions for operations at Sequoyah Nuclear Plant re-quires four channels of 125 volt de vital power to be operable to provide control power.
If one of the four vital power channels is in an inoperable status for more than 2 hours2.314815e-5 days <br />5.555556e-4 hours <br />3.306878e-6 weeks <br />7.61e-7 months <br /> (due to maintenance or testing) both units of the plant may be shutdown. The fifth vital battery system is intended to serve as a temporary replacement for any one of the four primary 125-V de vital batteries should a channel be inoperable. The system shall be design-ed to provide a temporary source of direct-current power for operation and control of essential systems and components under all modes of operation.
The fifth vital battery system shall be designed and constructed to comply with IEEE 308, reference 4.1.2.
2.0 SCOPE This document describes the design and equipment application for the fifth vital battery system at Sequoyah Nuclear Plant.
2.1 General Description The fif th vital battery system shall consist of a 125-V de battery along with the appropriate battery rack, charger, battery board, distribution panels, cabling, instrumentation, and protective devices necessary to ensure continued operation of the two unit plant should vital battery I, II, III, or IV become disabled for longer than the techneial specifica-tion period. This system shall provide (1) a highly reliable source of low noise direct-current power, (2) proper power distribution to any assigned primary vital battery board loads, and (3) sufficient capacity to supply the worse case loading conditions of any single primary 'rital battery system.
The primary vital battery system (consisting of vital batteries I, II, III, and IV and associated system components) is configured such that batteries I, II, III, and IV provide normal service to the vital 125-V de system. The fif th vital battery distribution system shall be design-ed so that in the event a single primary vital battery is removed from service for any reason (testing, maintenance, etc.), the fifth vital battery may be substituted for it with no impact on the reliability of the 125-V de vital power system.
2.2 System Configuration and Operation The 125V de fifth vital battery system shall be configured per drawing JDH0483, R2.
The system conceptual design and operational philosophy are as follows:
Battery charger V, which shall be seismic Category 1(L), shall function solely to recharge the fifth vital battery to and maintain it at the proper operating and equailze voltage levels: The charger shall experience no other loading at any.ime.
This non-Class IE system component shall be !
/
7 w
i i
e Description of the Proposed Electrical Power System for the 125-Volt Fif th Vital Battery System 2.2- (Continued) isolated from the remainder of the fifth vital battery system by two quali-ficd isolators, the battery charger fuse and circuit breaker. During normal operation, the charger shall supply the fifth vital battery through battery board V, via the normally closed charger and battery breakers.
The fif th vital battery board shall contain a manually operated break-before-make (BBM) transfer switch (mechanically interlocked to preserve train separa-tion) to permit system alignment to either distribution panel A or B.
Each distribution panel shall contain a manually operated BBM transfer switch (mechanically interlocked to preserve channel separation) to permit system aligr. ment to the selected primary vital battery board.
The procedure for the substitution of the fif th vital battery for a primary vital battery is as follows: First, the fif th charger must be disconnected from the fifth vital battery board via the charger breaker; second, the se-lected primary vital battery board must be aligned to its spare battery charger (1-S or 2-S) via the spare charger transfer switch (1-S or 2-S); third, the primary vital battery / primary vital battery board intertie breaker must be opened; fourth, the fifth vital battery board manual transfer switch must be aligned to the appropriate distribution panel feeder (A for batteries I and III, B for II and IV); fifth, the selected distribution panel manual transfer board must be aiigned to the appropriate primary vital battery board feeder; and sixth, the selected primary vital battery board /fif th vital battery inter-tie breaker must be closed.
In this mode of operation the fif th vital battery shall be maintained at the required nominal voltage level by the appropriate spare vital battery charger and shall be available, as needed, to supply all loads connected to the pri-mary vital battery board (refer to SQN-DC-V-11.2, "Sequoyah Nuclear Plant Design Criteria for 125-V Vital Battery System, Configuration and Operation").
The substitution of vital battery V for a primary vital battery shall in no manner degrade either the reliability or the capacity of the 125-V de vital power system: All system requirements shall be satisfied and all parameters unchanged.
(Note: To fulfill this requirement, the fifth vital battery and all associated cebling shall be sized such that the minimum primary vital battery board voltage with fifth vital battery connected is, under all circum-stances, greater than or equal to the primary battery board voltage with the primary vital battery connected.)
The fif th vital battery discharge test alignment procedure is as follows:
First, the battery charger V circuit breaker must be opened; second the fifth vital battery board manual transfer switch must be aligned to dis-tribution panel A; third, the distribution panel A battery discharge breaker must be closed; and fourth, the battery discharge test trailer must be positioned and connected as if primary vital battery I were to be discharged.
Recharging of the fifth vital battery shall be accomplished via battery charger V..
r De:criptica of thm Proposed Electrical P:w r Systea for the 125-Volt Fifth Vital Battery System 2.2' (Continued)
Recharging of a primary vital battery (following a discharge test) shall be accomplished via its normal vital battery charger with the fif th vital battery connected to the appropriate spare vital battery charger.
2.3 Equipment Description 2.3.1 Vital Class IE Battery The 125-V de fifth vital Class IE battery shall consist of 60 lead-acid calcium grid cells suitable for stationary atility plant service.
Each cell shall be of the scaled-type and shall be assembled in a shock absorbing clear plastic case. All case covers shall be bonded in place to form a leakproof seal and shall be equipped with explosion-resistant type vents.
2.3.2 Battery Charger [ Category I(L)]
l Battery charger V shall be of the constant voltage, current limiting, silicon-rectifier type and shall have output characteristics equal to or better than the following:
A.
Output vo1* age adjustment -- 129 to 140-V dc.
B.
Voltage regulation -- 11% for simultaneous variations of 17's% in alternating current supply voltage and 2% in supply frequency.
C.
Ripple amplitude -- 0.5% maximum.
t The battery charger shall be provided with following features, char-acteristics and/or facilities:
A.
Equalizing voltage adjustment and equalize timer.
B.
Natural convection cooling system sufficient for continuous, full-load operation in the environment described in subsection 2.6.
C.
Isolation transformers between supply and load circuits.
Battery charger instrumentation and alarms shall consist of at least the following:
A.
Overvoltage, undervoltage, and failure relays for monitoring by the plant computer.
B.
Voltmeter and ammeter for local indication, t
The fifth battery charger capacity shall be sufficient to accomplish battery recharging in approximately 40 hours4.62963e-4 days <br />0.0111 hours <br />6.613757e-5 weeks <br />1.522e-5 months <br /> following a battery dis-charge test.
s
Description of the Proposed Electrical Power System for the 125-Volt Fifth Vital Battery System 2.3.2 (Continued)
Battery charger V shall have no load other than the fif th vital battery and shall never substitute for a primary vital charger; therefore, its capacity need only be sufficient to recharge vital battery V as described.
2=.3.3 Battery Rack (Category I)
Vital battery V shall be mounted in a two-step rack suitable for easy maintenance. The rack shall be designed to hold the battery in place while being acted upon by seismic forces described in subsection 3.8.
2.3.4 Battery Board (Class IE)
The fifth vital battery board shall be a Class IE distribution center comprised of a battery breaker compartment complete with circuit breaker and fuse, a battery charger breaker compartment complete with circuit breaker and fuse, and a distribution panel A/B inttrtie compartment com-plete with a mechanically interlocked, manually operated transfer switch.
2.3.5 Distribution Panel A and B (Class IE)
The primary vital battery boards shall be supplied through two Class 1E Cistribution panels A and B.
(Panel A, located in the train A 6.9-kV shutdown board room, shall supply battery beards I and III. Panel B, located in the train B 6.9-kV shutdown board room, shall supply battery boards II and IV.) Both distribution panels A and B shall be furnished with a mechanically interlocked, manually operated transfer switch.
In addition, panel A shall be furnished with a battery discharge breaker compartment complete with breaker.
3.0 DESIGN REQUIREMENTS 3.1 Instrumentation The fif th vital battery system shall be configured in such a manner as to use existing instrumentation on the primary vital battery boards to the greatest extent possible (see drawing BHR0683).
In addition, the fifth vital battery system shall be provided with at least the following instrumentation:
A.
Battery board bus voltmeter.
B.
Battery board bus charge / discharge ammeter.
C.
Battery system ground detection with alarm devices.
D.
Main control room alarm for closure of any fifth vital battery system normally open breaker contacts shall be paralleled as follows (see drawing JDil0483, R2 for breaker identification) with a separate alarm for each combination:
1.
Breakers 1, 4, and 5.
4-
Description of.the Proposed Electrical Power System for the 125-Volt Fifth Vital Battery System 3.1. (Continued)
D.
2.
Breakers 2, 6, and 7.
3.
Breaker 3.
(Note: A separate alarm of breaker 3 closure is not required if design prevents concurrent closure of breakers 3 and 4.)
3.2 Battery Capacity The fifth vital battery shall have sufficient capacity to carry all the re-quired plant emergency loads of a single primary vital battery for 30 minutes under accident conditions without benefit of a primary vital battery charger, and for 2 hours2.314815e-5 days <br />5.555556e-4 hours <br />3.306878e-6 weeks <br />7.61e-7 months <br /> during nonaccident conditions under total plant blackout con-ditions (no onsite or offsite alternating-current power available). Battery sizing shall be in accordance with IEEE Standard 485(reference 4.1.10).
3.3 Physical and Electrical Separation The fifth vital battery system shall be designed to meet the physical and electrical separation requirements of TVA Design Criteria SQN-DC-V-12.2, Separation of Electric Equipment and Wiring.
3.4 Cable and Conduit The fifth vital battery system cables and conduit (as listed below) shall con-form to the following requirements per SQN-DC-V-12.2.
A.
All conduits and cables routed from the fifth vital battery shall be designation, "S".
B.
All conduits and cables routed from distribution panels A and B to the existing primary vital battery boards shall have the appropriate channel designations.
C.
All conduits of one train routed through areas of the other train shall be protected with a minimum I hour rated fire barrier while in the alien train area.
3.5 Ventilation To maintain hydrogen concentrations below 2% of room volume, the fifth vital battery room shall have a ventilation air flow rate of 1200 ft / min, with 3
exhaust air routed directly to the outside. Redundant exhaust fans (1 each, trains A and B) shall be provided for the fifth vital battery room.
3.6 Environmental Conditions All compon-tts of the fifth vital battery system shall be designed to operate continuously within specified tolerances in an environment with temperatures ranging between 60' and 104 F, and with an average relative humidity of 50%
(with occasional exposures up to 95%). All environmental control system com-ponents necessary to meet these requi ements shall be safety-related, seismic Category I, and shall be powered from Class IE power sources. l t
Description of the Proposed Electrical Power System for the 125-Volt Fifth Vital Battery. System 3.71 Maximum Flood Provision All components of the fifth vital battery system shall be located above the maximum possible flood level (elevation 721.0).
.3.8. Seismic Requirements The fifth vital battery system (excluding battery charger V) shall be capable of continuously performing its essential functions during and followir.g the shock and vibration caused by the accelerations of the safe shutdown earth-quake (SSE) specified in reference 4.3.3.
Battery charger V shall be seismic Category I(L).
3.9 Quality Assurance Requirements The fif th vital battery system (excluding battery charger V) shall be subject to all quality assurance procedures for design, specifications, testing, and installation of Class IE systems. Battery charger V shall be subject to lim-ited quall'.y assurance procedures.
3.10 Environmental Qualification of Class 1E Components All Class 1E components of the vital battery system shall comply with the requirements of IEEE 323.
4.0 REFERENCES
4.1 Design Input 4.1.1 IEEE 279, "IEEE Criteria for Nuclear Power Plant Protection System" (1971) 4.1.2 IEEE 308, "IEEE Criteria for Class 1E Electrical Systems for Nuclear Power Generating Stations" (1971) l l
4.1.3 IEEE 344, "IEEE Recommended Practice for Seismic Qualification of Class 1E Equipment for Nuclear Power Generating Stations" l
4.1.4 Regulatory Guide 1.32 i
l
<4.1.5 Regula' tory Guide 1.6 4.1.6 IEEE 450, " Recommended Practice for Maintenance -and Replacement of Large Stationary-Type Power Plant and Substation Lead Storage Batteries" (1972) 4.1.7 TVA Electrical Design Standard DS-E3.1.1, " Batteries and Chargers-Definitions and Capacities" l
4.1.8 Regulatory Guide 1.53, " Application of the Single Failure Criterion to Nucicar Power Plant Protection System" (1973) 4.1.9 IEEE 484, "IEEE Recommended Practice for Installation Design and Installation of Large Lead Storage Batteries for Generating Stations and Substations" l L
Description of the Proposed Electrical Power System for the 125-Volt Fif th Vital Battery System 4.1 (Continued) 4.1.10 IEEE 485, "IEEE Recommended Practice for Sizing Large Lead Storage
. Batteries for Generating Stations and Substations" 4.1.11 IEEE 535, "IEEE Standard for Qualification of Class 1E Lead Storage Batteries for Nuclear Power Generating Stations" 4.1.12 IEEE 323, "IEEE Stnadard for Qualifying Class IE Equipment for Nuclear Power Generating Stations"
4.2 Background
4.2.1 Sequoyah Nuclear Plant FSAR, Chapter 8 4.3 Design Criteria 4.3.1 TVA Design Criteria SQN-DC-V-11.2, "125-V Vital Battery System" 4.3.2 NRC Ceneral Design Criteria 10CFR50 Appendix A for Nuclear Power Plants 4.3.3 TVA Design Criteria WB-DC-40-31.13, " Seismic Qualification of Category I Fluid System Components and Electrical or Mechanical Equipment" 4.3.4 TVA Design Criteria SQN-DC-V-12.2, " Separation of Electric Equipment and Wiring" 4.4 Drawings (TVA Drawing No.)
4.4.1 45N202 Electrical Equipment General Arrangement 4.4.2 45N230 Electrical Equipment Battery and DC Equipment Room 4.4.3 45W299 Electrical E uipment 125V Vital Battery V l
4.4.4 45W363 Electrical Equipment 480V Board Room Layout 4.4.5 45W700-1 Key Diagram 120V AC and 125V DC Vital Power 4.4.6 45N703-1,2,3,4 Wiring Diagram 125V Vital Battery Boards I, II, III, IV, V 4.
1
- a 4
.A
- f..':. L,.e
- U. -
.w d.C. 4 ' = O_ L Ui
.m M' h ve!
I i ' $. *;l 3
.N..-... 1 i
4
. nc
~ ~%
F E * -. ~ '
m
.u.1. o...
.a. $...M.., h w
.j
$o. i.n.. u,-
- < ts t
- 5.S. *>
t -a 5.
8 rt s't n.
t
.W
. r
..4 i
0
.e.
- a. ~.e.. *.I..
+
.e.
.s, r.o '
es
.,e
.... e, o
,gh h w er e
ja Jr.
vos
.,..e,..
4 T'l Me i S nr 5 " ** f Eu
~.=t OOj N.E U
.e 1
dJ E
a6
[
,l'i e
h#
b, 1.
l O E t[z:
,e" n' % w! E" n. edd.
m}--
- U Q
we I Ns.
t MN E a
m 2.. n.'.
, il l ~
I n
- eo G;1 n." m 5 h.5:
Sps 3 8 -*,"
'J ".r:. o. c; *. u. : r.
.2.1 f, n> M
-.re p.. J egg.m....
a mm.
v n'r a
>u e y
e
- 3.a r.S. o 4 5 ~:".,, 4 3 E..,;. ::::e
- a. r.. :.:...m',
7.. n...t!:... s..
ip. i A
g y
- n.. t. i, v (.Il s.*..I./,' I ' y '2 v.7.E
- d W Eg. a,,,...6...-,
.t M.
1 eu a.
o
~6 f. ' e " O l O-I.'
- i.I,1 d y e f;.*>
- Pl
M*
~.., J
-sM y[ ;j
/
3,
.f, -o* o-4,O ",,.,.~ s i.,
T,,, ;,.
-:s. 4
{
i
,, y a e
_w
.m g
f
.v w
r.,
Q
.i 7FlLA $ t 2,
'. ' +
I
+ !9 '
C 5
y g ;
1 i
ci :
- u.1 i o r =,
!tU 'li' 4' AC
~ !I ' A li a
c1
- 't e
s' 3'-,'
3*
_~
.p(
6 i l r,') ', 4; ;
.;i: 1 In
'>/
ti ;c
'%a i
. U h! >
i{p 4
,r.
3
<JL*
'*f,.
.I
.t;i i
,c-g
.z'.
4 i
y, t.
's t
v s
L <
'I' 4
, s
,I t'
s
- ~
+ b4 3
l-i
}l
',.,i
- (,
e ci
'i I:
i 4
( '
j.
- )
g' I
~ < rs l l
6
-osc ;
-o o-It; I
I Iv l
t I
l l1 s
ma'
. L.,a.
l g
l..t i
l ls g
g l
L I ' ' '
-O I ti fitj A 'l t i : *I
'Q/
)
p.-.~.~.~..
g 3
,,,...)
- e. :,.
- e._.
.... t 1
g
.t. agp
. T, -
[+
J,
.I
.v
.,-rs
-ciu w --
s
..a;;:.......
i i
I I
g
'l
.l.
h i
. i I
ar e
s.,
?
l
-O I V l
lll[!
D-o c>---
4.I -*
J i
v l
To t
e i 'F l
L L_
J
[ g.,...; /
4,, g,.,
1.
- I
,g:-
a.1 e
n.
g
-.g
.i, Me..
I
'8J
- q !. l..
r
.l 4
l f
i l
4 ! C>---f+
i i.u a4titvo
- w l
,o '.!o L m,3 n re,,,,. it-i l
v-1
- a n. n m L
J n
(,
- -
- .. gg o
s 6el *f **.t.,e n
- ~
13 1
.Ot..m....V. b,e t.,%
.e Y::o..I.C...P.,',. :.
I na 6{,-
. gs
== 9 a.
., s $.i j. :,.,).R
},
.- h,9.,..
.Q
- .La. ' ^ J
7 1
,k L'
p :* I g
i 0
t t
c e -
f
(' I.j.1/
j
+.
t *,'*j, j 7
n F Ji
,t y d
.l
's
- /. a' a
s
'6
- 3
,i
- s 3
p.
' ? ',' y -
s w
t l.,
t
,; y a,*
-l f{l l Q
o....
e i Jl*
w
- t. r...,.. ') *.:t /
4 e
l
,8, U
- ,o
.n
,.U 1
ii.. ;,1 l( ". '..
s
.... A e
's<
4,*
'; ~['*
~,
g 4
1
'~
f d'
- . ' i.*
- j 'y
.e..,......
b
- v..
' f.; i:; V S !.
g
- *$ r llIl 3
UM#
l l
t-I we vi i*
-g 4
a T
!i its.
L' t __
A
-.. t).' t>.h.
- jr.. e.
n O,' (.> IWr -
n--
m eN o-O O k W r-*
-'O Ob"U^**
"' "3"*"'
R R
,._c,0 A s gf.
- O I
,,n
..s.,
i g
<>O fp*
n..
r%
f%
.hqf.
g... n
(.,
o--- O (% 4,
--i l
,I.
r%
4 -- O,, (> IW A/ --*
o g.Z.'. _.._
.....o.~o.-o.
.I o.,
. ~ ~ - -
)l (h
}$
\\
U.2.,
s.-
i
- v......
s 1J1J llll.
...__..-_.Q___.-..,
[o 'U[
((w) (>. MD-o-'
o q( o 4)p_
.,,.,e sq ' ; ; r.....
s c. e n.
I.*--
f v, l 4 n. *.'.
i g,*
~{
(
n;1 A
y. ' o ! ', ) * -- -H(-O, N)H. _O O d *
- s ni cr Iv' litI?
H : ', i.
- 't
'> ;,;
- 4 s
i F.
+
m O, WL -
i'
- j.,.
i '. 4.k on.od
- i.,..G..U..$.i.:.s.L k. i i.
i i
ATTACHMENT 2 SIGNIFICANT HAZARDS CONSIDERATION DETERMINATION i-1.
Is the probability of an occurrence or the consequences of an accident or malfunction of equipment important to safety previously evaluated in the safety analysis report increase?
No.
The addition of the fifth vital battery bank will not impact the design of the existing vital battery banks in such a manner as to increase the probability of an accident or malfunction previously evaluated in the FSAR. The fifth vital battery will not interface with any of the existing vital batteries.
2.
Is the possibility for an accident or malfunction of a different type than evaluated previously in the safety analysis report created?
No.
The newly installed equipment will be post-mod tested to assure that the connection of the fifth vital battery does not degrade the operation of the other four channels. IEEE Standards will be followed so that the new fif th vital battery system maintains train separation, provides qualified 1E power and does not degrade the operation of any system. Thus, this change will not create the possibility for an accident or malfunction of a different type than previously evaluated.
3 Is the margin of safety as defined in the basis of any technical specification reduced?
No.
This modification will necessitate a change in the technical i
specifications, but the changes caused by the addition of the fifth vital battery will not cause a degradation of any operating system. The fifth vital battery will operate in the same manner as the existing four, providing qualified low noise 125V DC power. Since the fifth vital battery will be a substitution for a vital power source, the margin of safety is not reduced.
Based on the above Safety Analysis, it is concluded that:
(1) the l
proposed change does not constitute a significant hazards consideration l'
as defined by 10 CFR 50.92; and (2) there is reasonable assurance that the health and safety of the public will not be endangered by the proposed change; and (3) this action will not result in a condition which significantly alters the impact of the station on the environment as described in the NRC Environmental Statement.
l 1
l I
L_
1
[
4 -
ENCLOSURE 2 DESCRIPTION OF AND JUSTIFICATION FOR TECHNICAL SPECIFICATIONS SEQUOYAH NUCLEAR PLANT TVA-SQN-TS-57
h i
TABLE OF CONTENTS Page Description of Change 1
Reason for Change.
1 System Description and Justification 2
Post Modification Testing Program.
2 Summary.
/,
Syutem Descr.tption
...... s.
.$1gmificant Hazards Consideration betermination I
t i
l i
1 1
i
5 D_escription of the change This change will allow the fif th-vital battery to be used to satisfy LCOs 3.8.2.1, 3.6.2,2, 3.8.2.3, and 3.8.2.4 for Sequoyah units 1 and 2 when one of the trained vital batteries (vital power channels) is out of service. The change will require installation of support systems, which are necessary to ensure the operability of the fif th vital battery (designated channel V), which will he operable at all times whether the fifth vital battery is in use as a substitute for a tralned vital power channel or not.
The following LCOs will ensure the operability of required subsystems when the fifth vital battery is required. The surveillance requirement on the subsystems will be maintained when the fifth vital battery is substituted for vital power channels I-IV to maintain subsystem operability and operability of the fif th vital battery.
LCO 3.8.2.1 AC Electrical Boards Modes 1, 2, 3, 4 LCO 3.8.2.2 AC Boards and Inverters Modes 5, 6 LCO 3.8.2.3 DC Vital Battery Channels Modes 1, 2, 3, 4 LCO 3.8.2.4 DC Electrical Equipment Modes 5, 6 LCO 3.3.3.8 Fire Detection The following subsystems will be installed to support the operations of the fifth vital battery:
IIcating, Ventilation, and Air Conditioning Fire Detection / Protection 12SV DC Charger Electrical Distribution Panels and Wiring These systems are used at dif ferent times during the operation of the fif th power channel. The heating, ventilation and air conditioning, and the fire detection / protection are in operation at all times to maintain the integrity of the fif th vital battery and battery boards. The 125V DC charger is used to maintain the battery at maximum charge (float saltage and specific gravity maintained). It is disconnected from use when the fifth vital power channel la in substitution. The electrical distribution panels and wiring are used when the fifth vital power channel is in use as a substitution power source.
Reason for the Change As currently designed, all four vital channels are required to satisfy the licensing design basis accidents while assuming a single failure. When any one of the four vital channels is declared inoperable, the action statement of LCO 3.8.2.3 allows only two hours to return all channels to operability.
This time constraint limits the magnitude of any maintenance and/or repair work that can be completed while either nuclear unit is at power. Operating experience at Sequoyah has indicated that there is a significant probability of exceeding this two-hour limit and incurring the cost of lost production due to a forced two-unit shutdown.
The addition of the fifth vital battery will preclude this loss of production by providing an alternate power supply which can be substituted for any trained DC channel. 1
i 4
Design Description and Justification for the Change TVA has designed and const ructed.the fif th vital bactery in accordance with the applicable design criteria as noted'and the dealgn description in attachment 1.
The fifth vital power channel is equivalent in operational capability to the existing vital power channels.
The basic concept of the design is to make maximum use of the existing cla's>
lE components. This minimizes the amount of new controls in the main control room, and it provides the fifth channel with control and accident logic circuits which are currently on the plant surveillance program.
Once the fifth vital battery has been substituted for any of the other four vital batteries, the annunciation in the main control room will be an indication of conditions of the fifth channel. The substituted vital battery's annunciation and control will operate the fifth vital battery. This will prevent having to run new cabling for the operation of the fif th vital battery.
The switching required to substitute the fifth vital b'attery for any of~the other four will require six different steps:
(1) Disconnection of the fif th vital battery charger; (2) Connection of spare charger; -(3) Disconnect the inoperable vital battery from battery board; (4) Align the fif th battery to the proper distribution panel; (5) Align the distribution panel to the inoperable battery board; and (6) Cluse the intertie breaker on the distribution panel.
The design provides separation of trained equipment by connection to only one distribution panel, each of which is trained. A sipplified diagram of this is provided by sketch 1.
)
The fif th vital battery room will have supplied a ventilation and heating system to maintain the room within temperature specification 'at all times.
The ventilation will run at all times through two supply headers and two exhaust headers through the ceiling of the room.
[teating is supplied by 30 kW heaters located in the supply headers. The vhntilation is used to maintain the hydro n concentration below ignitable ' limits.
All surveillance requirements on the fifth vital,6attery and vital battery board will be used to verify operability of the fifth vital battery.
Before initial use as a substitute for any of the vital channels, the fifth vital battery will be tested in a program to assure that the fifth battery can be substituted for any of the other four vital batteries. The post modification testing program described below will provide a baseline verification of the fif th vital battery design adequacy.
Post Modification Testing Program TVA will demonstrate the adequacy of the fif th channel vital power source design by performing a series of post modification tests. The test program will first verify the adequacy of the support subsystems required for fift,h vital battery operation. Then the fifth vital battery itself will be functionally tested in accordance with Regulatory Guide 1.32.
A brief description of the post modification testing program is provided.
1 1
rv-9 O
Su icn Hir VDC (QMN MCC A a
CH%6rR
-h-gnrita, y Barr r tw o
l L'ont<D V I
f (e
r I
A A
l 0
Cl f __
Di$ TAnGUTICN DI 51 RIEWIscN Pre 4cL 13 l
[--
vuiuct n U
O O
O O.
L1
[1 0
0 I
f f
I u
3 BAttrat U ni t i< f 84 rs t ty BOtt e t, 6 pHD BORAD l
v I
ur 11 r L-7 i2c v oc.
(e NO l
BntTEAY I
- eaTvru, eoin i i
i mm.,o y DtGCRHPGC.
conceir L
_ __ _]
( M't "' 1 s v-
- 1. -
a I
Post Modification Test (PMT) 31 will cover the following aspects of testing shown below:
After installation of the connection for the fifth vital battery on the existing boards, the boards will be tested to assure that the completed connection of wiring of the installation did not degrade the existing battery board's ability to function.
After' installation of the batteries, they will be discharge tested to assure that they can' supply the rated amount of power.
After' discharge, the battery bank will be recharpe tested to assure that the bank recharges to rated voltage in allowable time.
Af ter assurance that the fif th vital battery is in proper working order, the fifth channel is aligned up separately to the other four vital power channels to assure that the substitution of the fifth channel is operable.
Summary i
The installation of the fif th vital battery system will prevent a two-unic shutdown-when testing or repairing is to be done on any one of the four existing channels. The vital battery will be shown through post modification testing to perform as a suitable replacement for any of the other vital battery boards.
The support systems will perform their function to maintain the fif th battery board system in an operable condition to be a quick replacement for a failed
~
battery.
Sequoyah cperating experience has shown that the plant is vulnerable to the two-hour action statement of LCO 3.8.2.3 and that without this relief a significant probability exists that this action statement will result in a forced two-unit shutdown.
al
a 4,s-a m.a s
k e
I ATTACHMENT 1 TENNESSEE VALLEY AUTHORITY SEQUOYAH NUCLEAR PLANT UNITS'1 AND'2-DESCRIPTION OF THE PROPOSED ELECTRICAL POWER SYSTEM FOR THE 2
125-VOLT FIFTH VITAL BATTERY SYSTEM 1
1 S
e 4
e 4
,A
=
~...
Description of-the-Proposed Electrical Power System for the-125-Volt Fifth Vital Battery System TABLE OF CONTENTS Pa.ge
-1.0. PURPOSE 1
-2.'
SCOPE 1
2.1 General Description 1
2.2~ System Configuration and Operation
'l 2.3 Equipment Description 3
2.3.1 Vital Class IE Battery 3
2.3.2 Batttery Charger [ Category I (L)]
'3 2.3.3 Battery Rack (Category I) 4 2.3.4 Battery Board (Class IE) 4 2.3.5 Distribution Panels A and B (Class IE) 4 3.0 DESIGN REQUIREMENTS 4
3.1 Instrumentation 4
3.2 Battery Capacity 5
3 3 Physical and Electrical Separation 5
13.4 Cable and Conduit 5
3.5 Ventilation 5
3.6 Environmental. Conditions 5
3.7 Maximum Flood Provision 6
3.8 Seismic Requirements 6
3.9 Quality Assurance Requirements 6
3.10 Environmental Qualification of Class IE Components 6
4.0 REFERENCES
6 4.1 Design Input 6
'4.2
Background
7 4.3 Design Criteria 7
4.4 Drawings 7
5
-