U-604193, Transmittal of Revision 16 to Technical Specification Bases
| ML15005A387 | |
| Person / Time | |
|---|---|
| Site: | Clinton  |
| Issue date: | 12/31/2014 |
| From: | Newcomer M Exelon Generation Co |
| To: | Document Control Desk, Office of Nuclear Reactor Regulation |
| References | |
| U-604193 | |
| Download: ML15005A387 (7) | |
Text
oExeton Generation Clinton Power Station 8401 Power Road Clinton, IL 61727 U-604193 10 CFR 50.36 December 31, 2014 U. S. Nuclear Regulatory Commission ATTN: Document Control Desk Washington, D. C. 20555-0001 Clinton Power Station, Unit 1 Facility Operating License No. NPF-62 NRC Docket No. 50-461
Subject:
Transmittal of Revision 16 to the Clinton Power Station Technical Specification Bases In accordance with Clinton Power Station (CPS) Technical Specification 5.5.11, 'Technical Spe ification (TS) Bases Control Program," Exelon Generation Company (EGC), LLC is transmitting the revised pages constituting Revision 16 to th b CPS TS Bases. The changes associated with TS 5.5.11 require updates to the TS Bases to be submitted to the NRC at a frequency consistent with 10 CFR 50.71, "Maintenance of records, making of reports,"
paragraph (e).
There are no regulatory commitments in this letter.
Should you have any questions concerning this information, please contact Ms. Kathy Ann Baker, Regulatory Assurance Manager, at (217) 937-2800.
Respectfully, M. M. Newcomer Site Vice President Clinton Power Station JLP/blf - Revision 16 Bases Page Listing - Revision 16 Bases Pages
U-604193 Revision 16 Bases Page Listing B 3.6-101 B 3.7-6 B 3.7-18 B 3.8-50
U-604193 Revision 16 Bases Pages
SGT System B 3.6.4.3 BASES SURVEILLANCE SR 3.6.4.3.1 REQUIREMENTS Operating each SGT subsystem from the main control room for
> 15 continuous minutes ensures that both subsystems are OPERABLE and that all associated controls are functioning properly. It also ensures that blockage, fan or motor failure, or excessive vibration can be detected for corrective action.
The Surveillance Frequency is controlled under the Surveillance Frequency Control Program.
With regard to operating time values obtained pursuant to this SR, as read from plant indication instrumentation, the specified limit is considered to be a nominal value and therefore does not require compensation for instrument indication uncertainties (Ref.
10).
SR 3.6.4.3.2 This SR verifies that the required SGT filter testing is performed in accordance with the Ventilation Filter Testing Program (VFTP).
The VFTP includes testing HEPA filter performance, charcoal adsorber bypass leakage and efficiency, minimum system flow rate, combined HEPA filter and charcoal adsorber pressure drop, and heater dissipation.
The frequencies for performing the SGT System filter tests are in accordance with Regulatory Guide 1.52 (Ref. 4) and include testing initially, after 720 hours0.00833 days <br />0.2 hours <br />0.00119 weeks <br />2.7396e-4 months <br /> of system operation, once per 24 months, and following painting, fire, or chemical release in any ventilation zone communicating with the system. The laboratory test results will be verified to be within limits within 31 days of removal of the sample from the system. Additional information is discussed in detail in the VFTP.
With regard to filter testing values obtained pursuant to this SR, as read from plant indication instrumentation, the specified limit is considered to be a nominal value and therefore does not require compensation for instrument indication uncertainties (Ref.
11).
(continued)
CLINTON B 3.6-101 Revision No.
16-2
Division 1 and 2 SX Subsystems and UHS B 3.7.1 BASES (continued)
SURVEILLANCE SR 3.7.1.1 REQUIREMENTS This SR verifies UHS water volume is
Ž 593 acre-feet (excluding sediment).
The Surveillance Frequency is in accordance with UHS Erosion, Sediment Monitoring and Dredging Program.
With regard to UHS water volume values obtained pursuant to this SR, as read from plant indication instrumentation, the specified limit is considered to be a nominal value and therefore does not require compensation for instrument indication uncertainties (Ref.
9).
SR 3.7.1.2 Verifying the correct alignment for each manual, power operated, and automatic valve in each Division 1 and 2 SX subsystem flow path provides assurance that the proper flow paths will exist for Division 1 and 2 SX subsystem operation.
This SR does not apply to valves that are locked, sealed, or otherwise secured in position, since these valves were verified to be in the correct position prior to locking, sealing, or securing.
A valve is also allowed to be in the nonaccident position and yet considered in the correct position, provided it can be automatically realigned to its accident position within the required time.
This SR does not require any testing or valve manipulation; rather, it involves verification that those valves capable of potentially being mispositioned are in the correct position.
This SR does not apply to valves that cannot be inadvertently misaligned, such as check valves.
Isolation of the SX subsystem to components or systems does not necessarily affect the OPERABILITY of the associated SX subsystem.
As such, when all SX pumps, valves, and piping are OPERABLE, but a branch connection off the main header is isolated, the associated SX subsystem needs to be evaluated to determine if it is still OPERABLE.
Alternatively, it is acceptable and conservative to declare an SX subsystem inoperable when a branch connection is isolated.
The Surveillance Frequency is controlled under the Surveillance Frequency Control Program.
(continued)
CLINTON B 3.7-6 Revision No.
16-3
Control Room Ventilation System B 3.7.3 BASES ACTIONS G.1, G.2, and G.3 (continued)
During movement of irradiated fuel assemblies in the primary or secondary containment, during CORE ALTERATIONS, or during OPDRVs, with two Control Room Ventilation subsystems inoperable or with one or more Control Room Ventilation subsystems inoperable due to an inoperable CRE boundary, action must be taken immediately to suspend activities that present a potential for releasing radioactivity that might require treatment of the control room air.
This places the unit in a condition that minimizes the accident risk.
If applicable, CORE ALTERATIONS and movement of irradiated fuel assemblies in the primary and secondary containment must be suspended immediately.
Suspension of these activities shall not preclude completion of movement of a component to a safe position.
If applicable, actions must be initiated immediately to suspend OPDRVs to minimize the probability of a vessel draindown and subsequent potential for fission product release.
Actions must continue until the OPDRVs are suspended.
SURVEILLANCE SR 3.7.3.1 and SR 3.7.3.2 REQUIREMENTS This SR verifies that a subsystem in a standby mode starts on demand and continues to operate.
Standby systems should be checked periodically to ensure that they start and function properly.
As the environmental and normal operating conditions of this system are not severe, testing each subsystem provides an adequate check on this system.
Operation with the heaters on for Ž 15 continuous minutes demonstrates OPERABILITY of the system.
Periodic operation ensures that heater failure, blockage, fan or motor failure, or excessive vibration can be detected for corrective action.
The Recirculation Filter System (without heaters) need only be operated for Ž 15 minutes to demonstrate the function of the system.
The Surveillance Frequency is controlled under the Surveillance Frequency Control Program.
(continued)
CLINTON B 3.7-18 Revision No.
16-2
DC Sources--Operating B 3.8.4 BASES BACKGROUND The DC power distribution system is described in more detail (continued) in Bases for LCO 3.8.9, "Distribution Systems--Operating,"
and LCO 3.8.10, "Distribution Systems--Shutdown."
Each Division 1, 2, 3,
and 4 battery has adequate storage capacity to meet the duty cycle(s) discussed in the USAR, Section 8.3.2 (Ref.
4).
The battery is designed with additional capacity above that required by the design duty cycle to allow for temperature variations and other factors.
Each DC battery subsystem is separately housed in a
ventilated room apart from its charger and distribution centers.
Each subsystem is located in an area separated physically and electrically from the other subsystems to ensure that a single failure in one subsystem does not cause a failure in a redundant subsystem.
There is no sharing between redundant Class 1E subsystems such as batteries, battery chargers, or distribution panels.
The batteries for a DC electrical power subsystem are sized to produce required capacity at 80% of nameplate rating.
The minimum design voltage limit is 105 V.
The battery cells are flooded lead acid construction with a nominal specific gravity of 1.215.
This specific gravity corresponds to an open circuit battery voltage of approximately 120 V for a 58-cell battery (i.e.,
cell voltage of 2.065 volts per cell (Vpc)).
The open circuit voltage is the voltage maintained when there is no charging or discharging.
Once fully charged with its open circuit voltage > 2.065 Vpc, the battery cell will maintain its capacity for 30 days without further charging per manufacturer's instructions.
Optimal long-term performance,
- however, is obtained by maintaining a float voltage of 2.20 to 2.25 Vpc.
This provides adequate over-potential, which limits the formation of lead sulfate and self discharge.
The nominal float voltage of 2.22 Vpc corresponds to a total float voltage output of 128.8 V for a 58 cell battery as discussed in USAR 8.3.2 (Ref.
4).
Each battery charger of Division 1, 2, 3,
and 4 DC electrical power subsystems has ample power output capacity for the steady state operation of connected loads required during normal operation, while at the same time maintaining its battery bank fully charged.
Each battery charger has sufficient excess capacity to restore the battery bank from the design minimum charge to its fully charged state within 12 hours1.388889e-4 days <br />0.00333 hours <br />1.984127e-5 weeks <br />4.566e-6 months <br /> while supplying normal steady state loads (Ref.
4).
The battery charger is normally in the float charge mode.
Float charge is the condition in which the charger is supplying the connected loads and the battery cells are (continued)
CLINTON B 3.8-50 Revision No.
16-1