ML20090E104
| ML20090E104 | |
| Person / Time | |
|---|---|
| Site: | Vogtle  |
| Issue date: | 03/30/2020 |
| From: | NRC |
| To: | NRC/NRR/DNRL |
| References | |
| Download: ML20090E104 (54) | |
Text
From:
Schiller, Alina Sent:
Monday, March 30, 2020 1:11 PM To:
Vogtle PEmails
Subject:
Vogtle Units 3 and 4 Technical Exchange - LAR-20-003 [LAR 232]: Technical Specifications ESFAS-VES and Vacuum Relief Attachments:
UFSAR, TS, Bases Markups --DRAFT for Tech Ex Call.pdf; LAR-20-003 [LAR 232]
Technical Exchange Meeting [NRC].pdf Please enter the attached files in ADAMS for the 4/9/20 technical exchange.
- Thanks, Alina Schiller Project Manager Office of Nuclear Reactor Regulation Vogtle Project Office O-13 C10 301-415-8177
Hearing Identifier:
Vogtle_COL_Docs_Public Email Number:
553 Mail Envelope Properties (MN2PR09MB5177C045F15965B6FD8FB1E596CB0)
Subject:
Vogtle Units 3 and 4 Technical Exchange - LAR-20-003 [LAR 232]: Technical Specifications ESFAS-VES and Vacuum Relief Sent Date:
3/30/2020 1:11:03 PM Received Date:
3/30/2020 1:11:13 PM From:
Schiller, Alina Created By:
Alina.Schiller@nrc.gov Recipients:
"Vogtle PEmails" <Vogtle.PEmails@nrc.gov>
Tracking Status: None Post Office:
MN2PR09MB5177.namprd09.prod.outlook.com Files Size Date & Time MESSAGE 239 3/30/2020 1:11:13 PM UFSAR, TS, Bases Markups --DRAFT for Tech Ex Call.pdf 1508312 LAR-20-003 [LAR 232] Technical Exchange Meeting [NRC].pdf 2055369 Options Priority:
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DRAFT 7.2-37 Revision 7.2 VEGP 3&4 - UFSAR Figure 7.2-1 (Sheet 13 of 21)
Functional Diagram Containment and Other Protection MONITOR SAMPLE PUMPS AIR SUPPLY
DRAFT 7.3-16 Revision 6.2 VEGP 3&4 - UFSAR 7.3.1.2.16 Steam Dump Block Signals to block steam dump (turbine bypass) are generated from either of the following conditions:
1.
Low-2 reactor coolant system average temperature 2.
Manual initiation Condition 1 results from a coincidence of two of the four divisions of reactor loop average temperature (Tavg) below the Low-2 setpoint. This blocks the opening of the steam dump valves. This signal also becomes an input to the steam dump interlock selector switch for unblocking the steam dump valves used for plant cooldown.
Condition 2 consists of three sets of controls. The first set of two controls selects whether the steam dump system has its normal manual and automatic operating modes available or is turned off. The second set of two controls enables or disables the operations of the Stage 1 cooldown steam dump valves if the reactor coolant average temperature (Tavg) is below the Low-2 setpoint. The third set of two controls enables or disables the operation of the Stage 2 cooldown steam dump valves.
The functional logic relating to the steam dump block is illustrated in Figure 7.2-1, sheet 10.
7.3.1.2.17 Main Control Room Isolation, Air Supply Initiation, and Electrical Load De-energization Signals to initiate isolation of the main control room, to initiate the air supply, to open the main control room pressure relief isolation valves, and to de-energize nonessential main control room electrical loads are generated from any of the following conditions:
1.
High-2 main control room air supply radioactivity level 2.
Loss of ac power sources (low Class 1E battery charger input voltage) 3.
Low main control room differential pressure 4.
Manual initiation Condition 1 is the occurrence one of two main control room air supply radioactivity monitors detecting the iodine or particulate radioactivity level above the High-2 setpoint.
Condition 2 results from the loss of normal control room ventilation due to a loss of all ac power sources. A preset time delay is provided to permit the restoration of ventilation and ac power from the offsite sources or from the onsite diesel generators before initiation. The loss of all ac power is detected by undervoltage sensors that are connected to the input of each of the four Class 1E battery chargers. Two sensors are connected to each of the four battery charger inputs. The loss of ac power signal is based on the detection of an undervoltage condition by each of the two sensors connected to two of the four battery chargers. The two-out-of-four logic is based on an undervoltage to the battery chargers for divisions A or C coincident with an undervoltage to the battery chargers for divisions B or D.
Condition 3 results from the loss of main control room differential pressure as detected by the pressure boundary differential sensors. One out of two logic is based on main control room differential pressure below the Low setpoint for greater than 10 minutes.
In addition, the loss of all ac power sources coincident with main control room isolation will de-energize the main control room radiation monitors in order to conserve the battery capacity.
Condition 4 consists of two momentary controls. Manual actuation of either of the two controls will result in main control room isolation, air supply initiation, and electrical load de-energization.
sample pumps
, maintain room temperature below the equipment qualification limitation, and to ensure an adequate heat sink for MCR habitability.
air supply
DRAFT 7.3-31 Revision 6.2 VEGP 3&4 - UFSAR
- 14. Chemical and Volume Control System Makeup Isolation (See Figure 7.2-1, Sheets 3, 6, and 11) a.
High-2 pressurizer water level 4
2/4-BYP1 Automatically unblocked above P-19 Manual block permitted below P-19 b.
High-3 steam generator narrow range level 4/steam generator 2/4-BYP1 in either steam generator Manual block permitted below P-9 Automatically unblocked above P-9 c.
Automatic or manual safeguards actuation signal coincident with (See items 1a through 1e)
High10 pressurizer water level 4
2/4-BYP1 None d.
High-2 containment radioactivity 4
2/4-BYP1 None e.
Manual initiation 2 controls 1/2 controls None f.
Flux doubling calculation 4
2/4-BYP1 Manual block permitted above P-8 Automatically unblocked below P-6 or below P-8 Manual block permitted below P-8; demineralized water system isolation valves signaled closed when blocked below P-8 g.
High10 steam generator narrow range level coincident with 4/steam generator 2/4-BYP1 in either steam generator Manual block permitted below P-9 Automatically unblocked above P-9 Reactor trip (P-4) 1/division 2/4 None
- 15. Steam Dump Block (Figure 7.2-1, Sheet 10)(8) a.
Low reactor coolant temperature (Low-2 Tavg) 2/loop 2/4-BYP1 None b.
Mode control 2 controls 1/division None c.
Manual stage 1 cooldown control 2 controls 1/division None d.
Manual stage 2 cooldown control 2 controls 1/division None
- 16. Main Control Room Isolation, Air Supply Initiation, and Electrical Load De-energization (Figure 7.2-1, Sheet 13) a.
High-2 main control room supply air iodine or particulate radiation 2
1/21 None b.
Extended undervoltage to Class 1E battery chargers(8) 2/charger 2/2 per charger and 2/4 chargers5 None c.
Extended Low main control room differential pressure 2
1/21 None d.
Manual initiation(8) 2 controls 1/2 controls None Table 7.3-1 (Sheet 6 of 9)
Engineered Safety Features Actuation Signals Actuation Signal No. of Divisions/
Controls Actuation Logic Permissives and Interlocks (13)
(13) 24-hour air supply
DRAFT 7.3-34 Revision 6.2 VEGP 3&4 - UFSAR
- 28. Containment Vacuum Relief (Figure 7.2-1, Sheet 19) a.
Low-2 containment pressure 4
2/4-BYP1 None b.
Manual initiation coincident with the following condition:
2 controls 1/2 controls None Low containment pressure 4
2/4-BYP1 None Notes:
1.
Capable of bypass (examples: The 2 out of 4 logic becomes 2 out of 3, the 2 out of 3 logic becomes 2 out of 2, and the 1 out of 2 logic is 1 out of 1 with one bypass. Note that 2 out of 2 logic becomes 2 out of 1 which renders the function inoperable).
2/4-BYP, where identified, indicates bypass logic specifically for 2/4 coincidence logic functions.
2.
Any two channels from either tank not in same division.
3.
Two associated controls must be actuated simultaneously.
4.
Also, closes power-operated relief block valve of respective steam generator.
5.
The two-out-of-four logic is based on undervoltage to the battery chargers for divisions A or C coincident with an undervoltage to the battery chargers for divisions B or D.
6.
Any two channels from either loop not in same division.
7.
Any two channels from either line not in same division.
8.
This function does not meet the 10 CFR 50.36(c)(2)(ii) criteria and is not included in the Technical Specifications.
9.
Spurious ADS and IRWST injection actuations, both automatic and manual, are blocked as described in Subsection 7.3.1.2.4.1.
10.
Low and Low-1 are considered to be equivalent terms when referring to the first low setpoint designator. High and High-1 are considered to be equivalent terms when referring to the first high setpoint designator.
11.
Applies to only the Zinc/Hydrogen Addition Isolation.
12.
Applies to only the Auxiliary Spray Isolation.
Table 7.3-1 (Sheet 9 of 9)
Engineered Safety Features Actuation Signals Actuation Signal No. of Divisions/
Controls Actuation Logic Permissives and Interlocks
- 13. De-energization of Main Control Room air supply radiation monitor sample pumps occurs on an extended undervoltage to Class 1E 24-hour battery chargers coincident with Main Control Room Isolation, Air Supply Initiation, and Electrical Load De-energization actuation signal.
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$1' The ESFAS Main Control Room Isolation, Air Supply Initiation, and Electrical Load De-energization instrumentation channels for each Function in Table 3.3.13-1 shall be OPERABLE.
According to Table 3.3.13-1.
A. One or more Functions with one or more channel(s) inoperable.
A.1 Enter the Condition referenced in Table 3.3.13-1 for the channel(s).
Immediately B.
B.2 As required by Required Action A.1 and referenced in Table 3.3.13-1.
B.1 Verify one channel OPERABLE.
AND Immediately See Insert 2
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B.3 C.
C.2 D.
C E.
D.1 D.2 E.1 Insert 1 B
As required by Required Action A.1 and referenced in Table 3.3.13-1.
C.1 Verify one channel OPERABLE AND Immediately
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Insert 2
DRAFT INSERT 1 F.
-NOTE-Separate Condition entry is allowed for each channel.
As required by Required Action A.1 and referenced in Table 3.3.13-1.
F.1 Place inoperable channel in trip.
OR F.2.1 Verify actuation capability is maintained.
AND F.2.2 Restore channel to OPERABLE status.
6 hours6.944444e-5 days <br />0.00167 hours <br />9.920635e-6 weeks <br />2.283e-6 months <br /> 6 hours 7 days G. Required Action and associated Completion Time of Condition F not met.
G.1 De-energize both MCR air supply radiation monitor sample pumps.
6 hours6.944444e-5 days <br />0.00167 hours <br />9.920635e-6 weeks <br />2.283e-6 months <br /> INSERT 2 Table 3.3.13-1 (page 1 of 1)
ESFAS Main Control Room Isolation, Air Supply Initiation, and Electrical Load De-energization Instrumentation FUNCTION APPLICABLE MODES OR OTHER SPECIFIED CONDITIONS REQUIRED CHANNELS CONDITIONS SURVEIILANCE REQUIREMENTS
- 1. Main Control Room Air Supply Iodine or Particulate Radiation -
High 2 1
(a),2 (a),3 (a),4 (a) 2 B
SR 3.3.13.1 SR 3.3.13.2 (b)
(a) 2 C
SR 3.3.13.1 SR 3.3.13.2
- 2. Main Control Room Differential Pressure - Low 1,2,3,4 2
B SR 3.3.13.1 SR 3.3.13.2 (b) 2 C
SR 3.3.13.1 SR 3.3.13.2
- 3. Class 1E 24-Hour Battery Charger Undervoltage 1, 2, 3, 4, 5, 6, (b) 2 /24-hour battery charger F
SR 3.3.13.1 (a) Not applicable for the Main Control Room Air Supply Iodine or Particulate Radiation - High 2 function when the Main Control Room Envelope is isolated and the Main Control Room Emergency Habitability System is in operation.
(b) During movement of irradiated fuel assemblies.
Change 2:
DRAFT Technical Specifications Containment Isolation Valves 3.6.3 VEGP Units 3 and 4 3.6.3 - 1 Amendment No. 13 (Unit 3)
Amendment No. 13 (Unit 4) 3.6 CONTAINMENT SYSTEMS 3.6.3 Containment Isolation Valves LCO 3.6.3 Each containment isolation valve shall be OPERABLE, except for the containment isolation valves associated with closed systems.
APPLICABILITY:
MODES 1, 2, 3, and 4.
ACTIONS
- NOTES -
- 1.
Penetration flow path(s) may be unisolated intermittently under administrative controls.
- 2.
Separate Condition entry is allowed for each penetration flow path.
- 3.
Enter applicable Conditions and Required Actions for systems made inoperable by containment isolation valves.
- 4.
Enter applicable Conditions and Required Actions of LCO 3.6.1, Containment, when isolation valve leakage results in exceeding the overall containment leakage rate acceptance criteria.
CONDITION REQUIRED ACTION COMPLETION TIME A.
One or more penetration flow paths with one containment isolation valve inoperable.
A.1 Isolate the affected penetration flow path by use of at least one closed and de-activated automatic valve, closed manual valve, blind flange, or check valve with flow through the valve secured.
4 hours4.62963e-5 days <br />0.00111 hours <br />6.613757e-6 weeks <br />1.522e-6 months <br /> AND and for vacuum relief valves.
DRAFT Technical Specifications Vacuum Relief Valves 3.6.9 VEGP Units 3 and 4 3.6.9 - 1 Amendment No. 13 (Unit 3)
Amendment No. 13 (Unit 4) 3.6 CONTAINMENT SYSTEMS 3.6.9 Vacuum Relief Valves LCO 3.6.9 Two vacuum relief flow paths shall be OPERABLE.
AND Containment inside to outside differential air temperature shall be 90°F.
APPLICABILITY:
MODES 1, 2, 3, and 4.
MODES 5 and 6 without an open containment air flow path LQFKHVLQ
diameter.
ACTIONS CONDITION REQUIRED ACTION COMPLETION TIME A.
One vacuum relief flow path inoperable.
A.1 Restore vacuum relief flow path to OPERABLE status.
72 hours8.333333e-4 days <br />0.02 hours <br />1.190476e-4 weeks <br />2.7396e-5 months <br /> B.
Containment inside to outside differential air temperature > 90°F.
B.1 Restore containment inside to outside differential air temperature to within limit.
8 hours9.259259e-5 days <br />0.00222 hours <br />1.322751e-5 weeks <br />3.044e-6 months <br /> OR B.2 Reduce containment average temperature 80°F.
8 hours9.259259e-5 days <br />0.00222 hours <br />1.322751e-5 weeks <br />3.044e-6 months <br /> C.
Required Action and associated Completion Time of Condition A or B not met in MODE 1, 2, 3, or 4.
C.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 /> AND 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 /> OR Both vacuum relief flow paths inoperable in MODE 1, 2, 3, or 4.
check valves and two vacuum relief isolation valves
-NOTE-Vacuum relief valve OPERABILITY for closing is only required in MODES 1, 2, 3, and 4.
check valve E.
E.1 E.2 F.
F.1 F.2 A, B, C, D, or E Two vacuum relief check valves inoperable for opening OR Two vacuum relief isolation valves inoperable for opening in MODE 1, 2, 3, or 4.
Insert 3 Insert 4 check valve inoperable for opening
DRAFT INSERT3
-NOTE-Enter applicable Conditions and Required Actions of LCO 3.6.1, Containment, when vacuum relief valve leakage results in exceeding the overall containment leakage rate acceptance criteria.
DRAFT INSERT4
B. One vacuum relief isolation valve inoperable for opening B.1 Restore vacuum relief valve to isolation valve to OPERABLE status.
72 hours8.333333e-4 days <br />0.02 hours <br />1.190476e-4 weeks <br />2.7396e-5 months <br />
- NOTE-Separate Condition entry is allowed for each valve.
C. One or more vacuum relief valves inoperable for closing.
-NOTES-
- 1. Required Actions C.1 and C.2 are not required for vacuum relief valves open during Surveillances.
- 2. Required Actions C.1 and C.2 are not required for vacuum relief valves open when performing their vacuum relief function.
C.1 Close each vacuum relief isolation valve.
AND C.2 Verify each vacuum relief isolation valve is closed.
AND C.3 Restore affected valve to OPERABLE for closing.
4 hours4.62963e-5 days <br />0.00111 hours <br />6.613757e-6 weeks <br />1.522e-6 months <br /> Once per 7 days 30 days for inoperable vacuum relief isolation valves AND Prior to entering MODE 4 following next MODE 6 entry for inoperable vacuum relief check valves.
D. One or more vacuum relief isolation valves inoperable for closing.
AND One or more vacuum relief check valves inoperable for closing.
-NOTES-
- 1. Not required for vacuum relief valves open during Surveillances.
- 2. Not required for vacuum relief valves open when performing their vacuum relief function.
D.1 Close each vacuum relief isolation valve.
1 hour1.157407e-5 days <br />2.777778e-4 hours <br />1.653439e-6 weeks <br />3.805e-7 months <br />
DRAFT Technical Specifications Vacuum Relief Valves 3.6.9 VEGP Units 3 and 4 3.6.9 - 2 Amendment No. 13 (Unit 3)
Amendment No. 13 (Unit 4)
ACTIONS CONDITION REQUIRED ACTION COMPLETION TIME D.
Required Action and associated Completion Time of Condition A or B not met in MODE 5 or 6.
D.1 Open a containment air flow path 6 inches in diameter.
8 hours9.259259e-5 days <br />0.00222 hours <br />1.322751e-5 weeks <br />3.044e-6 months <br /> OR Both vacuum relief flow paths inoperable in MODE 5 or 6.
SURVEILLANCE REQUIREMENTS SURVEILLANCE FREQUENCY SR 3.6.9.1 Verify containment inside to outside differential air temperature LV )
12 hours1.388889e-4 days <br />0.00333 hours <br />1.984127e-5 weeks <br />4.566e-6 months <br /> SR 3.6.9.2 Verify each vacuum relief flow path is OPERABLE in accordance with the Inservice Testing Program.
In accordance with the Inservice Testing Program SR 3.6.9.3 Verify each vacuum relief valve actuates to relieve vacuum on an actual or simulated signal.
24 months G.
G.1 A, B, or E Two vacuum relief check valves inoperable for opening OR Two vacuum relief isolation valves inoperable for opening in MODE 5 or 6.
-NOTE-
- 1. Not required to be met for vacuum relief valves open during Surveillances.
- 2. Not required to be met for vacuum relief valves open when performing their vacuum relief function.
Verify each vacuum relief isolation valve is closed.
SR 3.6.9.2 31 days 3
4 valve isolation signals
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SR 3.8.1.4 Verify main control room air supply radiation monitor sample pump de-energizes on an actual or simulated actuation signal.
24 months NOTE Only required to be met when the main control room air supply radiation monitor sample pumps are energized.
DRAFT Technical Specifications DC Sources - Shutdown 3.8.2 VEGP Units 3 and 4 3.8.2 - 3 Amendment No. 13 (Unit 3)
Amendment No. 13 (Unit 4)
SURVEILLANCE REQUIREMENTS SURVEILLANCE FREQUENCY SR 3.8.2.1
- NOTE -
The following SRs are not required to be performed:
SR 3.8.1.2 and SR 3.8.1.3.
For DC sources required to be OPERABLE, the following SRs are applicable:
SR 3.8.1.1 SR 3.8.1.2 SR 3.8.1.3 In accordance with applicable SRs SR 3.8.1.4 The
DRAFT Technical Specifications Bases ESFAS Instrumentation B 3.3.8 VEGP Units 3 and 4 B 3.3.8 - 30 Revision 56 BASES APPLICABLE SAFETY ANALYSES, LCOs, and APPLICABILITY (continued)
Main Control Room Isolation, Air Supply Initiation, and Electrical Load De-energization Isolation of the main control room and initiation of the VES air supply provides a breathable air supply for the operators following an uncontrolled release of radiation. De-energizing non-essential main control room electrical loads maintains the room temperature within habitable limits. Main Control Room Isolation, Air Supply Initiation, and Electrical Load De-energization is actuated on a Control Room Air Supply Radiation - High 2 signal or a Main Control Room Differential Pressure -
Low signal.
Refueling Cavity and Spent Fuel Pool Cooling System (SFS) Isolation The SFS can be connected to the spent fuel pool, the fuel transfer canal, the refueling cavity, and the IRWST to clarify and purify the water. It can also connect the IRWST and refueling cavity to transfer water in preparation for refueling activities, and to return to normal operations from refueling activities. In the event of a leak in the nonsafety-related SFS, Refueling Cavity and SFS Isolation is actuated on the following signals:
x Spent Fuel Pool Level - Low 2; and x
IRWST Wide Range Level - Low.
ESF Logic LCO 3.3.15 and LCO 3.3.16 require four sets of ESF coincidence logic, each set with one battery backed logic group OPERABLE to support automatic actuation. These logic groups are implemented as processor based actuation subsystems. The ESF coincidence logic provides the system level logic interfaces for the divisions.
ESF Actuation LCO 3.3.15 and LCO 3.3.16 require that for each division of ESF actuation, one battery backed logic group be OPERABLE to support both automatic and manual actuation. The ESF actuation subsystems provide the logic and power interfaces for the actuated components.
on the following signals:
Main Control Room Air Supply Iodine or Particulate Radiation - High 2 Main Control Room Differential Pressure - Low Class 1E 24-hour Battery Charger Undervoltage Manual initiation The main control room air supply radiation monitor sample pumps are de-energized by PMS on Main Control Room Isolation, Air Supply Initiation, and Electrical Load De-energization signal coincident with Class 1E 24-hour battery charger undervoltage signal. The main control room radiation monitor sample pumps are de-energized to conserve battery capacity, maintain room temperature below the equipment qualification limitation, and provide an adequate heat sink for Main Control Room habitability.
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1.
2.
A Note is included in the Applicability to state that the MCR Air Supply Iodine or Particulate Radiation High 2 channels are not required to be OPERABLE if the Main Control Room Envelope (MCRE) is isolated and the Main Control Room Emergency Habitability System (VES) is in operation.
In the event of a Class 1E 24-hour battery charger undervoltage signal, the MCRE is isolated, the VES is initiated, and the MCR air supply radiation monitor sample pumps are de-energized to conserve battery capacity. With the MCR air supply radiation monitor sample pumps de-energized, the MCR Air Supply Iodine or Particulate Radiation High 2 function cannot be OPERABLE. Whenever both the MCRE has been isolated (VBS cannot supply air flow to the MCR) and the VES is providing pressurization and breathing air to the MCRE, the safety function of the MCR Air Supply Iodine or Particulate Radiation High - 2 channels is not required.
Insert 5
DRAFT ATTACHMENT 1
- 3. Class 1E Battery Charger Undervoltage Two undervoltage sensors are provided on the input to each of the four 24-hour battery charger inputs. The main control room isolation, air supply isolation, and electrical load de-energization is actuated by a two-out-of-four undervoltage condition. The two-out-of-four logic is based on a two-out-of-two undervoltage to the battery charger for divisions A or C coincident with an undervoltage to the battery chargers for divisions B or D. When the undervoltage to Class 1E battery chargers signal is present coincident with a main control room isolation, air supply initiation, and electrical load de-energization actuation signal, the main control room radiation monitor sample pumps are de-energized to conserve battery capacity and reduce equipment room heat loads.
Two channels per Class 1E battery charger are required to be OPERABLE in MODES 1, 2, 3, 4, 5, and 6 and during movement of irradiated fuel because in the result of a loss of all ac power event, the main control room radiation monitor sample pumps are required to be de-energized to conserve battery capacity and reduce equipment room heat loads.
- 3. Class 1E 24-hour Battery Charger Undervoltage Two undervoltage sensors are provided on the input to each of the four 24-hour battery charger inputs. The main control room isolation, air supply isolation, and electrical load de-energization is actuated by an undervoltage condition on the Class 1E 24-hour battery chargers. The logic is based on a two-out-of-two undervoltage to the 24-hour battery charger for divisions A or C coincident with an undervoltage to the 24-hour battery chargers for divisions B or D. When the undervoltage to Class 1E 24-hour battery chargers signal is present coincident with the main control room isolation, air supply initiation, and electrical load de-energization signal, the main control room air supply radiation monitor sample pumps are de-energized.
INSERT 5 Two channels per Class 1E 24-hour battery charger are required to be OPERABLE in MODES 1, 2, 3, 4, 5, and 6 and during movement of irradiated fuel because in the result of a loss of all ac power event, the main control room air supply radiation monitor sample pumps are required to be de-energized to conserve battery capacity, maintain room temperature below the equipment qualification limitation, and provide an adequate heat sink for Main Control Room habitability.
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, and Class 1E 24-hour Battery Charger Undervoltage A.1 Condition A addresses one or more Functions with one or more channels(s) inoperable.
In this case, the Required Action is to enter the Condition referenced in Table 3.3.13-1 immediately.
B.1, B.2, and B.3 Required Action B.1 verifies that one channel in the affected Function is OPERABLE. The Completion Time for Required Action B.1 is immediately because if two channels are inoperable then the Required Actions of Condition D are applicable.
B.2 that B.3 B.2
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C.1 and C.2 Required Action C.1 verifies that one channel in the affected Function is OPERABLE. The Completion Time for Required Action C.1 is immediately because if two channels are inoperable then the Required Actions of Condition D are applicable.
D.1 and D.2 of Condition B E.1 of Condition C Insert 6 The
DRAFT ATTACHMENT 2 F.1, F.2.1, and F.2.2 A NOTE is included for Function 3 that separate Condition entry is allowed for each channel.
The PMS logic requires both undervoltage relays for a given Division (27D, 27E) to drop out, and for this to occur in [Division A OR Division C] AND [Division B OR Division D] to generate the associated actuation signal.
With one channel inoperable, by Required Action F.1, the inoperable channel may be placed in a trip condition within 6 hours6.944444e-5 days <br />0.00167 hours <br />9.920635e-6 weeks <br />2.283e-6 months <br />. The Completion Time of 6 hours6.944444e-5 days <br />0.00167 hours <br />9.920635e-6 weeks <br />2.283e-6 months <br /> to place the inoperable channel in trip is reasonable considering the time required to complete this action. Once an inoperable channel is placed in trip, no additional action is required for the inoperable channel. If more than one channel is inoperable at a time, the configuration of inoperable channels in the trip condition may generate a Main Control Room Isolation, Air Supply Initiation, and Electrical Load De-energization and de-energize the MCR radiation monitor sample pumps.
In place of Required Action F.1, the Required Actions F.2.1 and F.2.2 may be performed.
Required Action F.2.1 is to verify that actuation capability is maintained. In order to verify actuation capability is maintained, the combination of channels either in trip or identified as OPERABLE must be able to perform the two out of four logic with an undervoltage to the battery chargers for divisions A or C coincident with an undervoltage to the battery chargers for divisions B or D. By Required Action F.2.2., restoring the channel to OPERABLE status within 7 days reflects a reasonable time to effect restoration of the qualified battery charger to OPERABLE status, consistent with LCO 3.8.1, DC Sources - Operating.
G.1 If the Required Action and completion time of Condition F cannot be met, the plant must be placed in a Condition in which the likelihood and consequences of an event are minimized. This is accomplished by de-energizing both main control room radiation monitor sample pumps within 6 hours6.944444e-5 days <br />0.00167 hours <br />9.920635e-6 weeks <br />2.283e-6 months <br />.
This allowed Completion Time is reasonable considering the time required to complete this action.
F.1, F.2.1, and F.2.2 Required Action F.1 allows the inoperable channel to be placed in a trip condition within 6 hours6.944444e-5 days <br />0.00167 hours <br />9.920635e-6 weeks <br />2.283e-6 months <br />.
The Completion Time of 6 hours6.944444e-5 days <br />0.00167 hours <br />9.920635e-6 weeks <br />2.283e-6 months <br /> to place the inoperable channel in trip is reasonable considering the time required to complete this action. Once an inoperable channel is placed in trip, single failure capability of the action is restored and no additional action is required for the inoperable channel. If more than one channel is inoperable at a time, the configuration of inoperable channels in the trip condition may generate an undesirable Main Control Room Isolation, Air Supply Initiation, and Electrical Load De-energization and de-energize the MCR air supply radiation monitor sample pumps. Therefore, one or more inoperable channels may be left untripped by optionally complying with Required Actions F.2.1 and F.2.2.
In place of Required Action F.1, the Required Actions F.2.1 and F.2.2 may be performed.
Required Action F.2.1 is to verify that actuation capability is maintained. In order to verify actuation capability is maintained, the combination of channels either in trip or OPERABLE must be able to maintain the actuation capability with an undervoltage to the 24-hour battery chargers for divisions A or C coincident with an undervoltage to the 24-hour battery chargers for divisions B or D. Perfoming the Required Action F.2.1 within the 6 hour6.944444e-5 days <br />0.00167 hours <br />9.920635e-6 weeks <br />2.283e-6 months <br /> Completion Time is a reasonable time to verify that actuation capability is maintained. Required Action F.2.2. also requires restoring the channel to OPERABLE status within 7 days. This reflects a reasonable time to effect restoration of the single failure capability of the undervoltage actuation function.
INSERT 6 Condition F is modified by a Note that states separate Condition entry is allowed for each channel. The Required Actions provide appropriate compensatory actions for each inoperable channel. Complying with the Required Actions may allow for continued operation, and subsequent inoperable channels are governed by subsequent Condition entry and application of associated Required Actions. The Completion Time(s) of the inoperable Function will be tracked separately for each Function starting from the time the Condition was entered for that Function.
G.1 If the Required Action and Completion Time of Condition F cannot be met, the plant must be placed in a Condition in which the likelihood and consequences of an event are minimized. This is accomplished by de-energizing both main control room air supply radiation monitor sample pumps within 6 hours6.944444e-5 days <br />0.00167 hours <br />9.920635e-6 weeks <br />2.283e-6 months <br />. This allowed Completion Time is reasonable considering the time required to complete this action.
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valves for opening Insert 8 Insert 9 check valves for opening valve It is acceptable to enter Condition A and B concurrently. The vacuum relief function is maintained with at least one isolation valve and one check valve OPERABLE, which is assured provided Condition F or G is not entered for two vacuum relief isolation valves or two vacuum relief check valves inoperable for opening.
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4 isolation and will actuate to the closed position on an actual or simulated actuation signal.
DRAFT INSERT 7 This LCO also addresses the minimum equipment required to perform the containment isolation function of the vacuum relief valves. The vacuum relief isolation valves are located in independent parallel paths outside containment and the vacuum relief check valves are located in independent parallel paths inside containment; they are connected by a common containment penetration. For one open vacuum relief path to be available, one of the isolation valves must open and one of the check valves must open. For isolation of the containment penetration flow path by a single barrier, either both of the isolation valves must be closed or both check valves must be closed. Therefore, two vacuum relief isolation valves and two vacuum relief check valves are required to be OPERABLE to ensure that at least one vacuum relief path is available with the failure to open of one isolation valve and/or one check valve and to ensure that there are two barriers for containment isolation. For vacuum relief valves to be OPERABLE, the valves must be OPERABLE for opening and OPERABLE for closing. A vacuum relief isolation valve is OPERABLE for opening if the isolation valve opens on an ESF open signal and is OPERABLE for closing if the isolation valve closes on an ESF closure signal. The self-actuated check valves are OPERABLE for opening if they open on a negative differential pressure of 0.2 psi and are OPERABLE for closing if they close with zero differential pressure across the valve.
INSERT 8 The Applicability is modified by a Note that the vacuum relief valve OPERABILITY for closing is only required in MODES 1, 2, 3, and 4. In MODES 1, 2, 3, and 4, a DBA could cause a release of radioactive material to containment. In MODES 5 and 6, the probability and consequences of these events are reduced due to the pressure and temperature limitations of these MODES.
Therefore, the vacuum relief valve OPERABILITY for closing is only required in MODES 1, 2, 3, and 4 to prevent leakage of radioactive material from containment. However, containment closure capability is required in MODES 5 and 6. The requirements for containment isolation valves, including the vacuum relief valves, during MODES 5 and 6 are addressed in LCO 3.6.7, Containment Penetrations.
INSERT 9 The Actions are modified by a Note that directs entry into the applicable Conditions and Required Actions of LCO 3.6.1, Containment, in the event that vacuum relief valve leakage results in exceeding the overall containment leakage rate acceptance criteria.
DRAFT INSERT 10 B.1 When one of the vacuum relief isolation valves is inoperable for opening, the inoperable valve must be restored to OPERABLE status within 72 hours8.333333e-4 days <br />0.02 hours <br />1.190476e-4 weeks <br />2.7396e-5 months <br />. Provided Condition F or G is not entered for two vacuum relief isolation valves or two vacuum relief check valves inoperable for opening, then the vacuum relief function is maintained with at least one isolation valve and one check valve (i.e., it is acceptable to enter Conditions A and B concurrently). The Completion Time period is consistent with other LCOs for the loss of one train of a system required to mitigate the consequences of a LOCA or other DBA.
C.1, C.2, and C.3 With one or more vacuum relief valve(s) inoperable for closing (including either two vacuum relief isolation valves inoperable for closing or two vacuum relief check valves inoperable for closing), provided Condition D is not applicable, the penetration has not lost isolation capability.
Consistent with LCO 3.6.3 Action A, the penetration flow path is to be isolated by the closure of the vacuum relief isolation valves within 4 hours4.62963e-5 days <br />0.00111 hours <br />6.613757e-6 weeks <br />1.522e-6 months <br />. Requiring both isolation valves to be closed assures a containment isolation barrier. The 4 hour4.62963e-5 days <br />0.00111 hours <br />6.613757e-6 weeks <br />1.522e-6 months <br /> Completion Time for Required Action C.1.
is reasonable considering the time required to isolate the penetration, the relative importance of supporting containment OPERABILITY during MODES 1, 2, 3, 4, and the availability of a second barrier.
The periodic verification performed by Required Action C.2 ensures that the vacuum relief isolation valves remain closed to isolate containment. The vacuum relief isolation valves are normally closed and will only be automatically opened due to an ESF signal on Containment Pressure Low-2. The Completion Time of once per 7 days for verifying the vacuum relief isolation valves are in the closed position is appropriate considering the probability of the valve misalignment is low.
For the vacuum relief isolation valves, the affected valves are to be restored to OPERABLE for closing within 30 days. For the check valves, which are located inside containment, the affected valves are to be restored to OPERABLE for closing following the next MODE 6 entry prior to entering MODE 4. The Completion Times are acceptable since the vacuum relief isolation valves will be confirmed closed, maintaining isolation of the containment penetration flow path, once per 7 days in accordance with Required Action C.2 and the low probability of the valves being opened during this time period. If the valves were opened for vacuum relief, air flows into containment from the atmosphere due to the negative pressure inside containment, and prevents radiological release from containment. Based on engineering judgement, there would be a reasonable time to monitor the containment pressure and manually close the isolation valves before failure to isolate containment would be a significant impact to safety.
Condition C is modified by a Note to provide clarification that separate Condition entry is allowed for each valve. This is acceptable, since the Required Actions for each Condition provide appropriate compensatory actions for each vacuum relief valve inoperable for closing.
Time is consistent with other LCOs for the loss of one train of a system required to mitigate the consequences of a LOCA or other DBA.
DRAFT Complying with the Required Actions may allow for continued operation, and subsequent vacuum relief valves inoperable for closing are governed by subsequent Condition entry and application of the associated Required Actions.
The Required Actions are modified by two Notes. Note 1 states that Required Actions C.1 and C.2 are not required for vacuum relief valves that are open during Surveillances. Surveillances which open the vacuum relief isolation valves are performed infrequently and the valves will only be open for a limited period of time. Note 2 states that Required Actions C.1 and C.2 are not required for vacuum relief valves performing their vacuum relief function. If vacuum relief is required, the valves need to be open to perform their safety function to maintain the integrity of the containment vessel. Air will flow into containment from the atmosphere due to the negative pressure inside containment which will prevent radiological release from containment during vacuum relief.
D.1 With one or more vacuum relief isolation valves and one or more vacuum relief check valves inoperable for closing, the penetration flow path is to be isolated by closing the isolation valves within 1 hour1.157407e-5 days <br />2.777778e-4 hours <br />1.653439e-6 weeks <br />3.805e-7 months <br /> to restore the containment boundary. With one isolation valve and one check valve inoperable for closing, the containment isolation capability is lost and a release path remains open. To address this, both vacuum relief isolation valves need to be closed to provide a containment isolation barrier. Therefore, Required Action D.1 requires the vacuum relief isolation valves to be closed within 1 hour1.157407e-5 days <br />2.777778e-4 hours <br />1.653439e-6 weeks <br />3.805e-7 months <br />. The 1 hour1.157407e-5 days <br />2.777778e-4 hours <br />1.653439e-6 weeks <br />3.805e-7 months <br /> Completion Time is consistent with the Action B of LCO 3.6.1.
In the event the vacuum relief isolation valves are closed in accordance with Required Action D.1, the vacuum relief isolation valves must be verified to be closed on a periodic basis per Required Action C.2 which also remains in effect. This periodic verification is necessary to ensure leak tightness of containment and that penetrations requiring isolation following an accident are isolated. The Completion Time of once per 7 days for verifying the vacuum relief isolation valves are in the closed position is appropriate considering the probability of the valve misalignment is low.
Required Action C.3 would also remain in effect. The Completion Times are acceptable since the vacuum relief isolation valves will be confirmed closed, maintaining isolation of the containment penetration flow path, once per 7 days in accordance with Required Action C.2 and the low probability of the valves being opened during this time period. If the valves were opened for vacuum relief, air flows into containment from the atmosphere due to the negative pressure inside containment, and prevents radiological release from containment. Based on engineering judgement, there would be a reasonable time to monitor the containment pressure and manually close the isolation valves before failure to isolate containment would be a significant impact to safety.
Required Action D.1 is modified by two Notes. Note 1 states that Required Action D.1 is not required for vacuum relief valves that are open during Surveillances. Surveillances which open the vacuum relief isolation valves are performed infrequently and the valves will only be open for
DRAFT a limited period of time. Note 2 states that Required Action D.1 is not required for vacuum relief valves performing their vacuum relief function. If vacuum relief is required, the valves need to be open to perform their safety function to maintain the integrity of the containment vessel. Air will flow into containment from the atmosphere due to the negative pressure inside containment which will prevent radiological release from containment during vacuum relief.
INSERT 11 SR 3.6.9.2 Each vacuum relief isolation valve must be verified to be closed every 31 days. This SR ensures that the vacuum relief isolation valves are closed as required, or if open, the valves are open for an allowable reason. The vacuum relief isolation valves are normally closed. The frequency of 31 days is appropriate considering the valves should only be opened to relieve vacuum or manually opened to perform Surveillances and the probability of the valve misalignment is low.
SR 3.6.9.2 is modified by two Notes. Note 1 states that SR 3.6.9.2 is not required to be met for vacuum relief valves that are open during Surveillances. Surveillances which open the vacuum relief isolation valves are performed infrequently and the valves will only be open for a limited period of time. Note 2 states that SR 3.6.9.2 is not required to be met for vacuum relief valves performing their vacuum relief function. If vacuum relief is required, the valves need to be open to perform their safety function to maintain the integrity of the containment vessel. Air will flow into containment from the atmosphere due to the negative pressure inside containment which will prevent radiological release from containment during vacuum relief.
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The main control room air supply radiation monitor sample pumps are de-energized by the Protection and Safety Monitoring System (PMS) on a "Main Control Room Isolation, Air Supply Initiation, and Electrical Load De-energization" signal coincident with a "Class 1E 24-hour Battery Charger Undervoltage" signal (refer to LCO 3.3.13,"ESFAS Main Control Room Isolation, Air Supply Initiation, and Electrical Load De-energization," Bases) to remove non-essential loads from the batteries.
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De-energization of the main control room air supply radiation monitor sample pumps on a valid PMS signal is also required to be OPERABLE to support the Class 1E 24-hour battery OPERABILITY based on the assumed battery load profile and to maintain equipment temperature limits.
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SR 3.8.1.4 Verification that the main control room air supply radiation monitor sample pumps de-energize on an actual or simulated signal from PMS is required every 24 months to assure that the non-essential Class 1E 24-hour battery loads are shed to maintain the assumed battery load profile.
The Surveillance Frequency is acceptable, given the unit conditions required to perform the test and other administrative controls existing to ensure adequate charger performance during these 24 month intervals. In addition, this Frequency is intended to be consistent with expected fuel cycle lengths.
This Surveillance is modified by a Note stating that it is only required to be met when the main control room air supply radiation monitor sample pumps are energized.
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