ML072980167
| ML072980167 | |
| Person / Time | |
|---|---|
| Site: | North Anna  |
| Issue date: | 10/24/2007 |
| From: | Gerald Bichof Virginia Electric & Power Co (VEPCO) |
| To: | Document Control Desk, Office of Nuclear Reactor Regulation |
| References | |
| 07-0630 | |
| Download: ML072980167 (28) | |
Text
VIRGINIA ELECTRIC AND POWER COMPANY RICHMOND, VIRGINIA 23261 October 24, 2007 u.s. Nuclear Regulatory Commission Attention: Document Control Desk Washington, D.C. 20555 Serial No.
NL&OS/ETS Docket Nos.
License Nos.
07-0630 RO 50-338/339 NPF-4/7 VIRGINIA ELECTRIC AND POWER COMPANY (DOMINION)
NORTH ANNA POWER STATION UNITS 1 AND 2 PROPOSED LICENSE AMENDMENT REQUEST LCO 3.8.7 AND 3.8.9 - SHARED COMPONENTS Pursuant to 10 CFR 50.90, Dominion requests amendments, in the form of changes to the Technical Specifications to Facility Operating License Numbers NPF-4 and NPF-7 for North Anna Power Station Units 1 and 2, respectively. The proposed amendments would revise LCO 3.8.7 and LCO 3.8.9 to support shared component operability on the opposite unit.
The proposed changes will add new Conditions, Required Action statements and Completion Times for LCO 3.8.7 and LCO 3.8.9 to address shared components.
The LCOs and Bases are being revised to include the 120V AC Vital Bus inverters as being required to support shared components on the opposite unit provides a discussion of and the basis for the proposed amendment.
The marked-up and proposed Technical Specifications pages are provided in Attachments 2 and 3, respectively. The associated marked-up Bases changes are provided in Attachment 4 for information only and will be implemented in accordance with the Technical Specification Bases Control Program and 10 CFR 50.59.
The proposed changes have been reviewed and approved by the Station Nuclear Safety and Operating Committee.
Dominion requests approval of the license amendments by December 31, 2008 with a 60-day implementation period.
In accordance with 10 CFR 50.91, a copy of this application, with attachments, is being provided to the appropriate designated officials of Virginia.
Serial No. 07-0630 Docket Nos. 50-338/339 Shared Components Page 2 of 3 If you have any questions or require additional information, please contact Mr. Thomas Shaub at (804) 273-2763.
Very truly yours, Vice President - Nuclear Engineering Attachments
- 1. Discussion of Changes
- 2. Marked-up Technical Specifications Changes
- 3. Proposed Technical Specifications Pages
- 4. Marked-up Technical Specifications Bases Changes Commitments made in this letter: None.
COMMONWEALTH OF VIRGINIA COUNTY OF HENRICO The foregoing document was acknowledged before me, in and for the County and Commonwealth aforesaid, today by Gerald T. Bischof, who is Vice President -
Nuclear Engineering, of Virginia Electric and Power Company.
He has affirmed before me that he is duly authorized to execute and file the foregoing document in behalf of that Company, and that the statements in the document are true to the best of his knowledge and belief.
Acknowledged before me this Ji!!.day of()f';b;!uru
,2007.
My Commission Expires: ~34 dOlf)
(SEAL)
VICKI L. HULL NoIary PuttIIc COMII\\IOI..anta of YIrgInIa l-.a
- ~.;(,JLak Notary Public al, **0
cc:
U.S. Nuclear Regulatory Commission Region II Sam Nunn Atlanta Federal Center 61 Forsyth Street, SW Suite 23T85 Atlanta, Georgia 30303 Mr. J. E. Reasor, Jr.
Old Dominion Electric Cooperative Innsbrook Corporate Center 4201 Dominion Blvd.
Suite 300 Glen Allen, Virginia 23060 State Health Commissioner Virginia Department of Health James Madison Building - i h floor 109 Governor Street Suite 730 Richmond, Virginia 23218 Mr. J. T. Reece NRC Senior Resident Inspector North Anna Power Station Mr. S. P. Lingam NRC Project Manager U. S. Nuclear Regulatory Commission One White Flint North MaiI Stop 0-8 G9A 11555 Rockville Pike Rockville, Maryland 20852 Mr. R. A. Jervey NRC Project Manager U. S. Nuclear Regulatory Commission One White Flint North MaiI Stop 0-8 G9A 11555 Rockville Pike Rockville, Maryland 20852 Serial No. 07-0630 Docket Nos. 50-338/339 Shared Components Page 3 of 3 (Serial No. 07-0630)
DISCUSSION OF CHANGE NORTH ANNA POWER STATION UNITS 1 AND 2 VIRGINIA ELECTRIC AND POWER COMPANY (DOMINION)
Serial No. 07-0630 Docket Nos. 50-338/339 Shared Components Page 1 of 9 Discussion of Changes 1.0 Introduction Pursuant to 10 CFR 50.90, Virginia Electric and Power Company requests amendments to the Technical Specification for North Anna Units 1 and 2. The proposed changes will revise: 1) LCO 3.8.7, "Inverters - Operating" to include the inverters from the opposite unit to power the required shared systems, and 2) LCO 3.8.9, "Distribution Systems -
Operating", to ensure that required 120 VAC Vital Buses are OPERABLE to support the operability of shared components on the other unit.
The associated Bases changes are being provided for your information.
The Bases changes will be processed in accordance with Technical Specification 5.5.13, Technical Specifications (TS) Bases Control Program.
2.0 Detailed Description
2.1 System Description
The Safeguards Area exhaust flow and Auxiliary Building Central Exhaust subsystem flow, when actuated, diverts flow through the AUXiliary Building HEPA filter and charcoal absorber assembly for the operating train.
In case of a DBA requiring their use, Auxiliary Building Central exhaust flow is diverted manually through the filters and the Safeguards Area exhaust can be diverted manually as a backup feature to the required automatic realignment function.
Emergency Core Cooling System (ECCS) Pump Room Exhaust Air Cleanup System (PREACS) includes both the Safeguards Area exhaust subsystem and the Auxiliary BUilding Central exhaust subsystem.
Following an accident, the Safeguards Area exhaust subsystem is automatically aligned to the auxiliary building filter banks upon a CDA signal, and the Auxiliary Building Central exhaust subsystem is manually aligned to the filter banks by post-LOCA emergency procedures.
This is reflected in UFSAR Sections 9.4.8 and 15.4.1.7.
The Safeguards Area exhaust subsystem may be manually aligned to the filter banks if needed using control switches on the associated unit's Control Room Ventilation Panel.
Two trains of electrical control circuits powered by the AC vital buses are required to maintain operability of the Auxiliary Building Central exhaust subsystem filter and bypass dampers. One circuit is associated with the manual control switch on the Unit 1 Ventilation Panel and is powered from Vital Bus 1-1 via inverter 1-1. The other circuit is associated with the manual control switch on the Unit 2 Ventilation Panel and is powered from Vital Bus 2-111 via inverter 2-3. Either circuit will realign all dampers to the filter position.
As currently written, the LeO does not address shared components on the opposite unit's AC vital bus. Loss of either Vital Bus 1-1 or Vital Bus 2-111 will result in the loss of the associated control circuit and, therefore, loss of one of the two required
Serial No. 07-0630 Docket Nos. 50-338/339 Shared Components Page 2 of 9 trains of ECCS PREACS.
Revision of the TS LCOs will ensure that proper consideration is given to the effects that the loss of a vital bus or inverter has on both units.
The two trains of controls for the Auxiliary Building Central exhaust subsystem filter and bypass dampers consist of the following:
a) Two trains of electrical control circuits.
One circuit is associated with the manual control switch on the Unit 1 Ventilation Panel and is powered from Vital Bus 1-1. The other circuit is associated with the manual control switch on the Unit 2 Ventilation Panel and is powered from Vital Bus 2-111.
Either circuit will realign all associated dampers to the filter position.
b) Two trains of air supplies.
One supply is from air accumulator 1-IA-TK-103A and supplies 1-HV-AOD-103-2 and 103-4.
The other supply is from air accumulator 1-IA-TK-103B and supplies 1-HV-AOD-103-1 and 103-3.
Either supply will realign one filter damper and one bypass damper to prevent unfiltered release (Either of the two supplies may be used with either ECCS PREACS train). Either instrument air or both air accumulators are required for manual filtration alignment one-hour after the accident.
As noted in UFSAR Sections 9.4.8 and 15.4.1.7, the dose analyses for a LOCA require the Auxiliary Building Central exhaust subsystem to be manually aligned to the Auxiliary Building charcoal filter banks within 60 minutes following the accident.
This manual alignment is specified in emergency procedures.
To perform this post-accident function, either one of the two electrical control switches, and either one of the two seismic air supplies are required.
In order to ensure that the subsystem remains single failure proof and can perform its intended safety function when called upon to function, the Technical Specifications are being revised to clarify the operability requirements of the inverters and vital buses.
2.2 Specific Changes LCO 3.8.7, "Inverters - Operating" and LCO 3.8.9, "Distribution Systems - Operating",
is being revised to include the 120 VAC vital buses and inverters as required to be OPERABLE to support shared component operability on the other unit.
Separate actions are created to address the condition where an AC vital bus or inverter, required to support shared components on the opposite unit, is inoperable.
The associated shared components would be declared inoperable within 7 days. In this case, two trains of controls are required for the Auxiliary Building Central Exhaust subsystem filter and bypass dampers, one powered from Unit 1 Vital Bus 1-1 via Inverter 1-1 and the other from Unit 2 Vital Bus 2-111 via Inverter 2-3.
LCO 3.8.7, Inverters - Operating Revise LCO 3.8.7 to replace "The Train H and Train J inverters shall be OPERABLE." with the following:
"The following inverters shall be OPERABLE.
Serial No. 07-0630 Docket Nos. 50-338/339 Shared Components Page 3 of 9
- a. The Train H and Train J inverters; and
- b. The necessary inverters on the other unit for each required shared component."
Revise LCO 3.8.7 Note b to read: "All other required AC vital buses are energized from their associated OPERABLE inverters."
Revise LCO 3.8.7 Conditions, Required Actions and Completion Times to read:
CONDITION REQUIRED ACTION COMPLETION TIME A. One inverter required by A.1 ---------NOTE------------
LCO 3.8.7.a inoperable Enter applicable Conditions and Required Actions of LCO 3.8.9, "Distribution Systems-Operating" with any vital bus de-energized.
Restore Inverter to 7 days OPERABLE status B. One or more inverters B.1 *********NOTE************
required by Enter applicable LCO 3.8.7.b inoperable.
Conditions and Required Actions of LCO 3.8.9, "Distribution Systems*Operating" with any vital bus de*energized.
Declare associated 7 days shared components inoperable B-:--C. Required Action and
-BC.1 Be in Mode 3 6 hours6.944444e-5 days <br />0.00167 hours <br />9.920635e-6 weeks <br />2.283e-6 months <br /> Associated Completion Ti me of Condition A not AND met
-BC.2 Be in Mode 5 36 hours4.166667e-4 days <br />0.01 hours <br />5.952381e-5 weeks <br />1.3698e-5 months <br /> Bases
Serial No. 07-0630 Docket Nos. 50-338/339 Shared Components Page 4 of 9 Revise Bases for LCO 3.8.7, Action B to C, and insert the Bases for new Required Action B.1 as follows:
With one or more required LCD 3.8.7.b inverters inoperable, the reliability of the shared component(s) on the other unit is degraded.
In this condition, the associated shared component(s) is declared inoperable within 7 days.
- Svv, MCRIESGR EVS, Auxiliary Building Central Exhaust System, and CC are shared systems.
BC.1 and BC.2 The existing B.1 and B.2 will now become C.1 and C.2.
LCO 3.8.9, "Distribution Systems - Operating" Revise LCO 3.8.9.b to read as follows:
b.
The necessary AC, DC and AC vital buses One AC and DC bus on the other unit for each required shared component.
Add new Condition F, Required Action F.1 and Completion Time to LCO 3.8.9 and revise current Actions F and G to G and H, respectively, as follows:
CONDITION REQUIRED ACTION COMPLETION TIME F. --------NOTE--------------
F.1 Declare associated Immediately Separate Condition entry is shared components allowed for each AC vital inoperable.
subsystem.
One or more required LCO 3.8.9.b AC vital electrical power Distribution subsystem(s) inoperable.
FoG. Required Action and FG.1 Be in Mode 3 6 hours6.944444e-5 days <br />0.00167 hours <br />9.920635e-6 weeks <br />2.283e-6 months <br /> associated Completion Time for Condition A, B, or AND C not met.
FG.1 Be in Mode 5 36 hours4.166667e-4 days <br />0.01 hours <br />5.952381e-5 weeks <br />1.3698e-5 months <br /> G:H. Two or more LeO 3.8.9 a.
GH.1 Enter LCO 3.0.3 Immediately electrical power distribution
Serial No. 07-0630 Docket Nos. 50-338/339 Shared Components p
5 f 9 aQe 0
subsystems inoperable that result in a loss of safety function.
Bases Add new paragraph to the Background Section for Bases B 3.8.9 Two trains of electrical control circuits on the AC Vital buses are required to maintain operability of the Auxiliary Building Central exhaust subsystem filter and bypass dampers. One circuit is associated with the manual control switch on the Unit 1 Ventilation Panel and is powered from Vital Bus 1-1. The other circuit is associated with the manual control switch on the Unit 2 Ventilation Panel and is powered from Vital Bus 2-11I.
Either circuit will realign all associated dampers to the filter position.
Revise Bases for LCO 3.8.9, Actions F and G to Actions G and H, respectively and insert the following Bases for new Action F as follows:
With one or more required LCO 3.8.9.b AC vital electrical power distribution sUbsystem(s) inoperable, the shared component(s) on the other unit is not capable of operating.
In this condition, the associated shared component is declared inoperable immediately. SW, MCR/ESGR EVS, Auxiliary Building Central Exhaust System, and CC are shared systems.
-F:G.1 and -F:G.2 The existing F.1 and F.2 will now become G.1 and G.2.
The existing G.1 will now become H.1.
Reference to Condition G will be changed to Condition H in first sentence.
3.0 Regulation Evaluation 3.1 Applicable Regulatory Requirements/Criteria Compliance with NRC Criteria General Design Criterion 17 - The vital power system has sufficient capacity to supply vital equipment necessary for safe operation and shutdown of the reactor while maintaining the acceptable fuel design limits and containment integrity.
The system also has independence and redundancy of components to ensure the performance of safety functions despite a single failure. The individual components are protected and
Serial No. 07-0630 Docket Nos. 50-338/339 Shared Components Page 6 of 9 separated from each other to reduce the probability of simultaneous malfunction during a design-basis accident or a loss-of-power condition.
The proposed changes do not affect compliance with GDC-17.
General Design Criterion 18 - Criterion 18 and Regulatory Guide 1.22, the vital power system status is continuously displayed and periodically checked.
It is designed to allow periodic testing of the system and individual components with the testing usually performed during reactor refueling, which does not interrupt power generation.
The individual channels or trains may be checked during operation without affecting the total system. The proposed changes do not affect compliance with GDC-18.
Compliance with Safety Guides Safety Guide 6 - The emergency ac power system for each unit is separated into two redundant and independent systems to provide safety-related equipment with dependable power with the loss of one system. The separated systems are able to be connected to a preferred power source or to a standby power source with no connection between the redundant systems. The proposed changes do not affect compliance with Safety Guide 6.
Safety Guide 22 - The ac power systems important to safety are designed to permit their safety-related functions to be tested.
The proposed changes do not affect compliance with Safety Guide 22.
Compliance with IEEE Criteria IEEE Standard 308 - The station service power system and its components are designed to operate during and after a design-basis event, retain its safety features, and keep its parameters within their specified limits. The safety-related systems are redundant systems so that a loss of one will not endanger personnel or structures.
All required Class 1E equipment is qualified to operate during and after an event.
IEEE Standards 336 and 344 - The vital power system equipment was inspected and tested from the time of manufacturing to the start-up of the entire plant. The proposed changes do not affect compliance with these IEEE standards.
The proposed changes do not affect compliance with the IEEE standards noted above.
3.2 Significant Hazards Consideration This license amendment proposes revisions to the LCO and Bases for LCO 3.8.7, "Inverters -
Operating" and LCO 3.8.9, "Distribution Systems -
Operating".
The following changes are proposed:
TS 3.8.7, Inverters - Operating - Include the inverters from the opposite unit which power the required shared systems.
Serial No. 07-0630 Docket Nos. 50-338/339 Shared Components Page 7 of 9 TS 3.8.9, Distribution Systems - Operating - Ensure that each required 120 VAC vital bus is OPERABLE to support the operability of shared components on the other unit.
Dominion has evaluated whether or not a significant hazards consideration is involved with the proposed amendment by focusing on the three standards set forth in 10 CFR 50.92, "Issuance of Amendment," as discussed below:
1.
Involve a significant increase in the probability or consequences of an accident previously evaluated.
The proposed amendment does not involve a significant increase in the probability or consequence of an accident previously analyzed.
There is no change to how or under what conditions the inverters or 120 VAC vital buses are operated nor are there any changes to acceptable operating parameters.
Operability requirements, which are consistent with current operation of the inverters and vital buses, are being established for the inverters and vital buses associated with shared systems. The proposed change will ensure that there is an operable electrical control circuit for the Auxiliary Building Central Exhaust subsystem filter and bypass dampers for each train of ECCS PREACS which will ensure that the evaluated dose consequences for DBAs will not be exceeded.
Therefore, the proposed changes do not involve a significant increase in the probability or consequences of an accident previously evaluated.
2.
Create the possibility of a new or different kind of accident from any accident previously evaluated.
The implementation of the proposed changes does not create the possibility of an accident of a different type than was previously evaluated in the UFSAR.
There is no change to how or under what conditions the inverters or 120 VAC vital buses are operated nor are there any changes to acceptable operating parameters.
The proposed operability requirements, which are consistent with current operation of the inverters and vital buses, are being established for the inverters and vital buses associated with shared systems.
The proposed changes ensure vital 120 VAC power is available to support operation of the Auxiliary Building Central Exhaust subsystems. These changes do not alter the nature of events postulated in the UFSAR nor do they introduce any unique precursor mechanisms.
Therefore, the proposed changes do not create the possibility of a new or different kind of accident from any previously evaluated.
3.
Involve a significant reduction in the margin of safety.
Serial No. 07-0630 Docket Nos. 50-338/339 Shared Components Page 8 of 9 The implementation of the proposed changes does not reduce the margin of safety. The proposed changes for the 120 VAC Vital Bus System and Inverters do not affect the ability of these systems or components to perform their intended safety functions to provide power to required safety and monitoring systems or components.
Operability requirements, which are consistent with current operation of the inverters and vital buses, are being established for the inverters and vital buses associated with shared systems.
These changes provide additional assurance that the Auxiliary Building Central Exhaust subsystems will operate to maintain the margin of safety.
Therefore, the proposed changes do not involve a significant reduction in the margin of safety.
3.3 Conclusion In conclusion, based on the considerations discussed above, (1) there is reasonable assurance that the health and safety of the public will not be endangered by operation in the proposed manner, (2) such activities will be conducted in compliance with the Commission's regulations, and (3) the issuance of the amendment will not be inimical to the common defense and security or to the health and safety of the public.
4.0 Environmental Impact Evaluation 10CFR51.22(c)(9) provides criteria for and identification of licensing and regulatory action eligible for categorical exclusion from performing an environmental assessment.
A proposed amendment to an operating license for a facility requires no environmental assessment if operation of the facility in accordance with the proposed amendment would not: (1) involve a significant hazards consideration, (2) result in a significant change in the type or a significant increase in the amounts of any effluents that may be released offsite, or (3) result in a significant increase in individual or cumulative occupational exposure.
Dominion has reviewed this license amendment and has determined that it meets the eligibility criteria for categorical exclusion set forth in 10CFR51.22(c)(9).
Pursuant to 10CFR52.22(c), no environmental impact statement or environmental assessment needs to be prepared in connection with the issuance of the proposed license amendment. The basis for this determination is as follows:
- 1. The proposed license amendment does not involve a significant hazards consideration as described in Section 4.2.
- 2. As discussed in the significant hazards evaluation, the changes proposed by this amendment do not result in a significant change or significant increase in the public dose consequences for North Anna design basis radiological accidents. It does not change the operation of the ventilation systems during normal or
Serial No. 07-0630 Docket Nos. 50-338/339 Shared Components Page 9 of 9 emergency operations sequences.
Therefore, implementation of the proposed changes will not result in a significant change in the types or increase in the amount of any effluents that may be released offsite.
- 3. The changes proposed by this amendment do not result in a significant increase in control room operator doses during design basis radiological accidents nor do they require other actions that could increase occupational radiation exposure.
The proposed changes will ensure that there is an operable electrical control circuit for the Auxiliary Building Central Exhaust subsystem filter and bypass dampers for each train of ECCS PREACS.
Therefore, the proposed amendments will not result in a significant increase in individual or cumulative occupational radiation exposure.
5.0 References
- 1. North Anna Power Station UFSAR Sections - 8.3.1.2,9.4, 12.2 and 15.4
- 2. North Anna Power Station Amendments 231/212, dated April 5, 2002 3.
Plant Issue N-2005-3766 (Serial No. 07-0630)
MARKED-UP TECHNICAL SPECIFICATION CHANGES NORTH ANNA POWER STATION UNITS 1 AND 2 VIRGINIA ELECTRIC AND POWER COMPANY (DOMINION)
Inverters-Operating 3.8.7 3.8 ELECTRICAL POWER SYSTEMS 3.8.7 Inverters-operating
~1"5~
LCO 3.8.7 Thehr~l ~~r;l"@rters shall be OPERABLE.
- - - - - - - - - - - - NOTE - - - - - - - - - - - -
One inverter may be disconnected from its associated DC bus for $ 24 hours2.777778e-4 days <br />0.00667 hours <br />3.968254e-5 weeks <br />9.132e-6 months <br /> to perform an equalizing charge on its associated battery, provided:
- a. The associated AC vital bus is energized from its constant voltage source transformer; and
~
- b. All otherAACVlfal buses are energlZed from then associatea OPERABLE inverters.
APPLICABILITY:
MODES 1, 2, 3, and 4.
ACTIONS CONDITION A.
One inverter A.l inoperable.
( requ-lru b't UO 3.6.~
REQU IRED ACTI ON
NOTE--------
Enter applicable Conditions and Required Actions of LCO 3.8.9, "Distribution Systems-Operating" with any vital bus de-energized.
Restore inverter to OPERABLE status.
COMPLETION TIME 7 days r:/
Requ ired Action and 1'.
d C 1
C, assoclate omp etlOn
~
(
t1~et"dl #0" A)
North Anna Units 1 and 2 Be in MODE 3.
Be in MODE 5.
3.8.7-1 6 hours6.944444e-5 days <br />0.00167 hours <br />9.920635e-6 weeks <br />2.283e-6 months <br /> 36 hours Amendments 235/217
INSERTS FOR SHARED SYSTEMS TS Insert A
- a. The Train H and Train J inverters; and
- b. The necessary inverters on the other unit for each required shared component."
Insert 8 B. One or more inverters B.1 *********NOTE************
required by Enter applicable LCO 3.8.7.b inoperable.
Conditions and Required Actions of LCO 3.8.9, "Distribution Systems*Operating" with any vital bus de*energized.
Declare associated 7 days shared components inoperable
Distribution Systems-Operating 3.8.9 3.8 ELECTRICAL POWER SYSTEMS 3.8.9 Distribution Systems-Operating LCO
3.8.9 APPLICABILITY
The following distribution subsystems shall be OPERABLE:
- a. The Train H and Train J AC, DC, and AC vital buses; and ROAe AC alid BE btls on the other unit for each required
(
u.
~hared component.
- ~D~>~
MODES 1, 2, 3, and 4.
ACTIONS CONDITION A.
One or more LCO 3.8.9.a AC electrical power distribution subsystem(s) inoperable.
North Anna Units 1 and 2 A.l REQU IRED ACn ON
NOTE--------
Enter applicable Conditions and Required Actions of LCO 3.8.4, "DC Sources-Operating,"
for DC train(s) made inoperable by inoperable distribution subsystem(s).
Restore AC electrical power distribution subsystem(s) to OPERABLE status.
3.8.9-1 COMPLETION TIME 8 hours9.259259e-5 days <br />0.00222 hours <br />1.322751e-5 weeks <br />3.044e-6 months <br /> AND 16 hours1.851852e-4 days <br />0.00444 hours <br />2.645503e-5 weeks <br />6.088e-6 months <br /> from discovery of fail ure to meet LCO Amendments 231/212
Distribution Systems-Operating 3.8.9 CONDITION REQUIRED ACTION COMPLETION TIME 4
Required Action and
(~1 Be in MODE 3.
6 hours6.944444e-5 days <br />0.00167 hours <br />9.920635e-6 weeks <br />2.283e-6 months <br /> associated Completion Time for Condition A, rl B, or C not met.
,.2 Be in MODE 5.
36 hours4.166667e-4 days <br />0.01 hours <br />5.952381e-5 weeks <br />1.3698e-5 months <br /> f.
Two or more
~
Enter LCO 3.0.3.
Immediately LCO 3.8.9.a electrical power distribution subsystems inoperable that result in a loss of safety function.
ACTIONS
/~~.
(~
SURVEILLANCE REQUIREMENTS SURVEILLANCE FREQUENCY SR 3.8.9.1 Verify correct breaker alignments and voltage to required AC, DC, and AC vital bus electrical power distribution subsystems.
7 days North Anna Units 1 and 2 3.8.9-3 Amendments
~1/21i\\.--
(Serial No. 07-0630)
PROPOSED TECHNICAL SPECIFICATIONS CHANGES NORTH ANNA POWER STATION UNITS 1 AND 2 VIRGINIA ELECTRIC AND POWER COMPANY (DOMINION)
Inverters-Operating 3.8.7 3.8 ELECTRICAL POWER SYSTEMS 3.8.7 Inverters-operating LCO 3.8.7 The following inverters shall be OPERABLE.
- a. The Train H and Train J inverters; and
- b. The necessary inverters on the other unit for each required shared component.
- - - - - - - - - - - - NOTE - - - - - - - - - - - -
One inverter may be disconnected from its associated DC bus for $ 24 hours2.777778e-4 days <br />0.00667 hours <br />3.968254e-5 weeks <br />9.132e-6 months <br /> to perform an equalizing charge on its associated battery, provided:
- a. The associated AC vital bus is energized from its constant voltage source transformer; and
APPLICABILITY:
MODES 1, 2, 3, and 4.
ACTIONS CONDITION A.
One inverter required A.l by LCO 3.8.7.a inoperable.
North Anna Units 1 and 2 REQUIRED ACTI ON
NOTE--------
Enter applicable Conditions and Required Actions of LCO 3.8.9, "Distribution Systems-Operating" with any vital bus de-energized.
Restore inverter to OPERABLE status.
3.8.7-1 COMPLETION TIME 7 days
ACTIONS Inverters-operating 3.8.7 CONDITION REQUIRED ACTION COMPLETION TIME B.
One or more inverters B.l
NOTE--------
required by Enter applicable LCO 3.8.7.b Conditions and inoperable.
Required Actions of LCO 3.8.9.
"Distribution Systems-Operating" with any vital bus de-energized.
Declare associated 7 days shared components inoperable.
C.
Required Action and C.l Be in MODE 3.
6 hours6.944444e-5 days <br />0.00167 hours <br />9.920635e-6 weeks <br />2.283e-6 months <br /> associated Completion Time of Condition A AND not met.
C.2 Be in MODE 5.
36 hours4.166667e-4 days <br />0.01 hours <br />5.952381e-5 weeks <br />1.3698e-5 months <br /> SURVEILLANCE REQUIREMENTS SR 3.8.7.1 SURVEILLANCE Verify correct inverter voltage and alignment to required AC vital buses.
FREQUENCY 7 days North Anna Units 1 and 2 3.8.7-2
Distribution Systems-Operating 3.8.9 3.8 ELECTRICAL POWER SYSTEMS 3.8.9 Distribution Systems-Operating LCO 3.8.9 The following distribution subsystems shall be OPERABLE:
APPLICABILITY:
MODES I, 2, 3, and 4.
ACTIONS CONDITION A.
One or more LCO 3.8.9.a AC electrical power distribution subsystem(s) inoperable.
North Anna Units 1 and 2 A.l REQUIRED ACTION
NOTE--------
Enter applicable Conditions and Required Actions of LCO 3.8.4, "DC Sources-Operating,"
for DC train(s) made inoperable by inoperable distribution subsystem(s).
Restore AC electrical power distribution subsystem(s) to OPERABLE status.
3.8.9-1 COMPLETION TIME 8 hours9.259259e-5 days <br />0.00222 hours <br />1.322751e-5 weeks <br />3.044e-6 months <br /> 16 hours from discovery of fail ure to meet LCO
Distribution Systems-Operating 3.8.9 ACTIONS CONDITION REQUIRED ACTION COMPLETION TIME F.
NOTE----------
F.l Declare associated Immediately Separate Condition shared components entry is allowed for inoperable.
each AC vital subsystem.
One or more required LCO 3.8.9.b AC vital electrical power distribution subsystem(s) inoperable.
G.
Required Action and G.1 Be in MODE 3.
6 hours6.944444e-5 days <br />0.00167 hours <br />9.920635e-6 weeks <br />2.283e-6 months <br /> associated Completion Time for Condition A.
AND B. or C not met.
G.2 Be in MODE 5.
36 hours4.166667e-4 days <br />0.01 hours <br />5.952381e-5 weeks <br />1.3698e-5 months <br /> H.
Two or more H.l Enter LCO 3.0.3.
Immediately LCO 3.8.9.a el ectrical power distribution subsystems inoperable that result in a loss of safety function.
SURVEILLANCE REQUIREMENTS SR 3.8.9.1 SURVEILLANCE Verify correct breaker alignments and voltage to required AC. DC. and AC vital bus electrical power distribution subsystems.
FREQUENCY 7 days North Anna Units 1 and 2 3.8.9-3 (Serial No. 07-0630)
MARKED-UP TECHNICAL SPECIFICATIONS BASES CHANGES (For Information Only)
NORTH ANNA POWER STATION UNITS 1 AND 2 VIRGINIA ELECTRIC AND POWER COMPANY (DOMINION)
BASES ACTIONS Inverters-operating B 3.8.7 A.l (continued)
- b. Entry into Condition Awill not be planned concurrent
~~
with planned maintenance on another RPS/ESFAS channel
~'::5:2.-----------
~~~~; ~~~~ ~ts ; n that channel bei ng ina t ri pped
@.1 anB:ir§ If the inoperable devices or components cannot be restored to OPERABLE status within the required Completion Time, the unit must be brought to a MODE in which the LCO does not apply. To achieve this status, the unit must be brought to at least MODE 3 within 6 hours6.944444e-5 days <br />0.00167 hours <br />9.920635e-6 weeks <br />2.283e-6 months <br /> and to MODE 5 within 36 hours4.166667e-4 days <br />0.01 hours <br />5.952381e-5 weeks <br />1.3698e-5 months <br />.
The allowed Completion Times are reasonable, based on operating experience, to reach the required unit conditions from full power conditions in an orderly manner and without challenging unit systems.
SURVEILLANCE REQUIREMENTS REFERENCES SR 3.8.7.1 This Surveillance verifies that the inverters are functioning properly with all required circuit breakers closed and AC vital buses energized from the inverter. The verification of proper voltage output ensures that the required power is readily available for the instrumentation of the RTS and ESFAS connected to the AC vital buses. The 7 day Frequency takes into account the redundant capability of the inverters and other indications available in the control room that alert the operator to inverter malfunctions.
- 1. UFSAR, Chapter 8.
- 2. UFSAR, Chapter 6.
- 3. UFSAR, Chapter 15.
North Anna Units 1 and 2 B 3.8.7-4 Revision ~
BACKGROUND (continued)
Distribution Systems-operating B 3.8.9 BASES For the other unit, one AC and DC bus on that unit is needed to support operation of each required Service Water (SW) pump, Main Control Room (MCR)/Emergency Switchgear Room (ESGR) Emergency Ventilation System (EVS) fan, Auxiliary Building central exhaust fan, and Component Cooling Water
~E'\\
(CC) pump. SW, MCR/ESGR EVS, Auxiliary Building central
(~~S~~)
exhaust system, and CC are shared systems.
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The list of all required distribution buses is presented in Tabl e B 3.8.9-1.
APPLICABLE SAFETY ANALYSES LCO The initial conditions of Design Basis Accident (DBA) and transient analyses in the UFSAR, Chapter 6 (Ref. 1), and in the UFSAR, Chapter 15 (Ref. 2), assume ESF systems are OPERABLE. The AC, DC, and AC vital bus electrical power distribution systems are designed to provide sufficient capacity, capability, redundancy, and reliability to ensure the availability of necessary power to ESF systems so that the fuel, Reactor Coolant System, and containment design limits are not exceeded. These limits are discussed in more detail in the Bases for Section 3.2, Power Distribution Limits; Section 3.4, Reactor Coolant System (RCS); and Section 3.6, Containment Systems.
The OPERABILITY of the AC, DC, and AC vital bus electrical power distribution systems is consistent with the initial assumptions of the accident analyses and is based upon meeting the design basis of the unit. This includes maintaining power distribution systems OPERABLE during accident conditions in the event of:
- a. An assumed loss of all offsite power or all onsite AC electrical power; and
- b. Aworst case single failure.
The distribution systems satisfy Criterion 3 of 10 CFR 50.36(c)(2) (i i).
The required power distribution subsystems listed in Table B 3.8.9-1 ensure the availability of AC, DC, and AC vital bus electrical power for the systems required to shut down the reactor and maintain it in a safe condition after an (continued)
North Anna Units 1 and 2 B 3.8.9-2 Revision 0
BASES ACTIONS Distribution Systems-Operating B 3.8.9 0.1 (continued)
Ventilation System," LCO 3.7.12, "Emergency Core Cooling System Pump Room Exhaust Air Cleanup System," and LCO 3.7.19, "Component Cooling Water (CC) System," are followed.
E.1 With one or more required LCO 3.8.9.b DC electrical power distribution subsystem(s) inoperable, the shared component(s) on the other unit is not capable of operating.
In this condition, the associated shared component is declared inoperable immediately. SW, MCR/ESGR EVS, Auxiliary Building central exhaust system, and CC are shared systems.
The associated Conditions or Required Actions of LCO 3.7.8, 3.7.10, 3.7.12, and 3.7.19 are followed.
~
1 andJ'!?J r:,
If the inoperable LCO 3.8.9.a distribution subsystem cannot be restored to OPERABLE status within the required Completion Time, the unit must be brought to a MODE in which the LCO does not apply. To achieve this status, the unit must be brought to at least MODE 3 within 6 hours6.944444e-5 days <br />0.00167 hours <br />9.920635e-6 weeks <br />2.283e-6 months <br /> and to MODE 5 within 36 hours4.166667e-4 days <br />0.01 hours <br />5.952381e-5 weeks <br />1.3698e-5 months <br />. The allowed Completion Times are reasonable, based on operating experience, to reach the required unit conditions from full power conditions in an orderly manner and without challenging unit systems.
Condition G corresponds to a level of degradation in the electrical power distribution system that causes a required safety function to be lost. When more than one inoperable LCO 3.B.g.a electrical power distribution subsystem results in the loss of a required function, the unit is in a condition outside the accident analysis. Therefore, no additional time is justified for continued operation.
LCO 3.0.3 must be entered immediately to commence a controlled shutdown.
North Anna Units 1 and 2 B 3.8.9-9 Revision-&-
INSERTS FOR SHARED SYSTEMS BASES Insert C With one or more required LCO 8.8.7.b inverters inoperable, the reliability of the shared component(s) on the other unit is degraded.
In this condition, the associated shared component(s) is declared inoperable within 7 days.
SW, MCR/ESGR EVS, Auxiliary Building Central Exhaust System, and CC are shared systems.
Insert D F.l Declare associated Immediately F. --------NOTE--------------
shared components Separate Condition entry is inoperable.
allowed for each AC vital subsystem.
One or more required LCO 3.B.9.b AC vital electrical power Distribution subsystem(s) inoperable.
Insert E Two trains of electrical control circuits on the AC Vital buses are required to maintain operability of the Auxiliary Building Central exhaust subsystem filter and bypass dampers.
One circuit is associated with the manual control switch on the Unit 1 Ventilation Panel and is powered from Vital Bus 1-1. The other circuit is associated with the manual control switch on the Unit 2 Ventilation Panel and is powered from Vital Bus 2-111. Either circuit will realign all associated dampers to the filter position.
Insert F F.1 With one or more required LCO 8.8.9.b AC vital electrical power distribution subsystem(s) inoperable, the shared component(s) on the other unit is not capable of operating.
In this condition, the associated shared component is declared inoperable immediately.
SW, MCR/ESGR EVS, Auxiliary Building Central Exhaust System, and CC are shared systems.