ML031220315
| ML031220315 | |
| Person / Time | |
|---|---|
| Site: | Oconee  |
| Issue date: | 04/30/2003 |
| From: | NRC/NRR/DLPM/LPD2 |
| To: | |
| Olshan L N, NRR/DLPM, 415-1419 | |
| References | |
| TAC MB6933, TAC MB6934, TAC MB6935 | |
| Download: ML031220315 (6) | |
Text
TABLE OF CONTENTS 3.4.6 RCS Loops - MODE 4 ........................................ 3.4.6-1 3.4.7 RCS Loops - MODE 5, Loops Filled ........................................ 3.4.7-1 3.4.8 RCS Loops - MODE 5, Loops Not Filled ........................................ 3.4.8-1 3.4.9 Pressurizer ........................................ 3.4.9-1 3.4.10 Pressurizer Safety Valves ........................................ 3.4.10-1 3.4.11 RCS Specific Activity ........................................ 3.4.11-1 3.4.12 Low Temperature Overpressure Protection (LTOP)
System ...................................... 3.4.12-1 3.4.13 RCS Operational LEAKAGE ...................................... 3.4.13-1 3.4.14 RCS Pressure Isolation Valve (PIV) Leakage .................................... 3.4.14-1 3.4.15 RCS Leakage Detection Instrumentation ...................................... 3.4.15-1 3.5 EMERGENCY CORE COOLING SYSTEMS (ECCS) ................................ 3.5.1-1 3.5.1 Core Flood Tanks (CFTs) ...................................... 3.5.1-1 3.5.2 High Pressure Injection ...................................... 3.5.2-1 3.5.3 Low Pressure Injection ...................................... 3.5.3-1 3.5.4 Borated Water Storage Tank (BWST) ...................................... 3.5.4-1 3.6 CONTAINMENT SYSTEMS ...................................... 3.6.1-1 3.6.1 Containment ...................................... 3.6.1-1 3.6.2 Containment Air Locks ...................................... 3.6.2-1 3.6.3 Containment Isolation Valves ...................................... 3.6.3-1 3.6.4 Containment Pressure ...................................... 3.6.4-1 3.6.5 Reactor Building Spray and Cooling System ...................................... 3.6.5-1 3.7 PLANT SYSTEMS ...................................... 3.7.1-1 3.7.1 Main Steam Relief Valves (MSRVs) ...................................... 3.7.1-1 3.7.2 Turbine Stop Valves (TSVs) ...................................... 3.7.2-1 3.7.3 Main Feedwater Control Valves (MFCVs), and Startup Feedwater Control Valves (SFCVs) .................................... 3.7.3-1 3.7.4 Not used .................................... 3.7.4-1 3.7.5 Emergency Feedwater (EFW) System .................................... 3.7.5-1 3.7.6 Upper Surge Tank (UST) and Hotwell (HW) .................................... 3.7.6-1 3.7.7 Low Pressure Service Water (LPSW) System ................................... 3.7.7-1 3.7.8 Emergency Condenser Circulating Water (ECCW) ........................... 3.7.8-1 3.7.9 Control Room Ventilation System (CRVS) Booster Fans ................................ 3.7.9-1 3.7.10 Penetration Room Ventilation System (PRVS) ................................ 3.7.10-1 3.7.11 Spent Fuel Pool Water Level ................................ 3.7.11-1 3.7.12 Spent Fuel Pool Boron Concentration ................................ 3.7.12-1 3.7.13 Fuel Assembly Storage ................................. 3.7.13-1 OCONEE UNITS 1, 2, & 3 iii Amendment Nos. 330, 300, & 331 I
TABLE OF CONTENTS B 3.4 REACTOR COOLANT SYSTEM (RCS) ........................................ B 3.4.1-1 B 3.4.1 RCS Pressure, Temperature, and Flow Departure from Nucleate Boiling (DNB) Limits ............................... B 3.4.1-1 B 3.4.2 RCS Minimum Temperature for Criticality ............................... B 3.4.2-1 B 3.4.3 RCS Pressure and Temperature (P/T) Limits .............................. B 3.4.3-1 B 3.4.4 RCS Loops - MODES 1 and 2................................ B 3.4.4-1 B 3.4.5 RCS Loops - MODE 3............................... B 3.4.5-1 B 3.4.6 RCS Loops - MODE 4 ............................... B 3.4.6-1 B 3.4.7 RCS Loops - MODE 5, Loops Filled ............................... B 3.4.7-1 B 3.4.8 RCS Loops - MODE 5, Loops Not Filled ............................... B 3.4.8-1 B 3.4.9 Pressurizer ................................ B 3.4.9-1 B 3.4.10 Pressurizer Safety Valves ................................ B 3.4.10-1 B 3.4.11 RCS Specific Activity ................................ B 3.4.11-1 B 3.4.12 Low Temperature Overpressure Protection (LTOP)
System ..................................... B 3.4.12-1 B 3.4.13 RCS Operational LEAKAGE ..................................... B 3.4.13-1 B 3.4.14 RCS Pressure Isolation Valve (PIV) Leakage .............................. B 3.4.14-1 B 3.4.15 RCS Leakage Detection Instrumentation ..................................... B 3.4.15-1 B 3.5 EMERGENCY CORE COOLING SYSTEMS (ECCS) .......................... B 3.5.1-1 B 3.5.1 Core Flood Tanks (CFTs) ...................................... B 3.5.1-1 B 3.5.2 High Pressure Injection (HPI) ...................................... B 3.5.2-1 B 3.5.3 Low Pressure Injection (LPI) ...................................... B 3.5.3-1 B 3.5.4 Borated Water Storage Tank (BWST) ...................................... B 3.5.4-1 B 3.6 CONTAINMENT SYSTEMS ..................................... B 3.6.1-1 B 3.6.1 Containment ..................................... B 3.6.1-1 B 3.6.2 Containment Air Locks ..................................... B 3.6.2-1 B 3.6.3 Containment Isolation Valves ...................................... B 3.6.3-1 B 3.6.4 Containment Pressure ..................................... B 3.6.4-1 B 3.6.5 Reactor Building Spray and Cooling System ................................ B 3.6.5-1 B 3.7 PLANT SYSTEMS ..................................... B 3.7.1-1 B 3.7.1 Main Steam Relief Valves (MSRVs) ..................................... B 3.7.1-1 B 3.7.2 Turbine Stop Valves (TSVs) ..................................... B 3.7.2-1 B 3.7.3 Main Feedwater Control Valves (MFCVs), and Startup Feedwater Control Valves (SFCVs) .................................... B 3.7.3-1 B 3.7.4 Atmospheric Dump Valve (ADV) Flow Paths ............................... B 3.7.4-1 B 3.7.5 Emergency Feedwater (EFW) System .................................... B 3.7.5-1 B 3.7.6 Upper Surge Tank (UST) and Hotwell (HW) ................................ B 3.7.6-1 B 3.7.7 Low Pressure Service Water (LPSW) System ............................. B 3.7.7-1 B 3.7.8 Emergency Condenser Circulating Water (ECCW) ..................... B 3.7.8-1 OCONEE UNITS 1, 2, & 3 iii Amendment Nos. 330, 330, & 331 l
UST and HW l 3.7.6 3.7 PLANT SYSTEMS 3.7.6 Upper Surge Tank (UST) and Hotwell (HW) I LCO 3.7.6 The UST and HW shall be OPERABLE. I APPLICABILITY: MODES 1, 2, and 3, MODE 4 when steam generator is relied upon for heat removal.
ACTIONS CONDITION REQUIRED ACTION COMPLETION TIME A. Requirements of the A.1 Be in MODE 3. 12 hours1.388889e-4 days <br />0.00333 hours <br />1.984127e-5 weeks <br />4.566e-6 months <br /> LCO not met.
AND A.2 Be in MODE 4 without 24 hours2.777778e-4 days <br />0.00667 hours <br />3.968254e-5 weeks <br />9.132e-6 months <br /> reliance on steam generator for heat removal.
SURVEILLANCE REQUIREMENTS SURVEILLANCE FREQUENCY SR 3.7.6.1 Verify combined inventory in the UST and HW 12 hours1.388889e-4 days <br />0.00333 hours <br />1.984127e-5 weeks <br />4.566e-6 months <br /> is 2 155,000 gal.
AND Inventory in the UST is 2 30,000 gal.
OCONEE UNITS 1, 2, & 3 3.7.6-1 Amendment Nos. 330, 330, & 331 I
UST AND HW I B 3.7.6 B 3.7 PLANT SYSTEMS B 3.7.6 Upper Surge Tank (UST) and Hotwell (HW)
BASES BACKGROUND The UST and HW provide a source of water to the steam generators for removing decay and sensible heat from the Reactor Coolant System (RCS). The UST and HW provide a passive flow of water to the Emergency Feedwater (EF\) System (LCO 3.7.5, "Emergency Feedwater (EFW) System"). For accident mitigation, heat removal is assumed to be through steam released to the atmosphere by the main steam safety valves and the atmospheric dump valves. However, the most likely steam flow path is to the condenser and hotwell by the non-safety grade path of the turbine bypass valves.
The emergency feedwater pumps are normally aligned to the upper surge I tanks (UST). The UST provides the initial source of water for the EFW System. When that supply is exhausted, the pumps may be aligned to draw water from the hotwell. A minimum level of 6 feet (at least 30,000 I gallons) is maintained in the UST to assure an adequate source of water to the EFW until other sources can be aligned. This minimum level of 6 feet includes an allowance for instrument uncertainty and depletion of inventory while transferring the EFW suction to an alternative source of water.
The UST and the piping connecting them to the EFW pumps has been analyzed and qualified to withstand a design basis seismic event. This includes piping up to the first normally closed valve. The hotwell and connected piping used for the TDEFW pump suction supply has been I evaluated using a "seismic experience" approach and found capable of withstanding a seismic event. Although the evaluation methodology is not recognized for licensing basis, this secondary water supply is considered to be a "seismic assured source of water." Feedwater is also available from alternate source(s).
A description of the condensate/feedwater reserves available to the EFW System is found in the UFSAR, Section 10.4, (Ref. 1).
OCONEE UNITS 1, 2, & 3 B 3.7.6-1 Amendment Nos. 330, 300, & 331 I
UST AND HW I B 3.7.6 BASES (continued)
APPLICABLE The UST and HW provide cooling water to remove decay heat I SAFETY ANALYSES following events in the accident analysis, as discussed in the UFSAR, Chapters 10 and 15 (Refs. 2 and 3, respectively).
The required inventory in the UST and HW is based on maintaining hot standby conditions for one hour, followed by a 50'F per hour cooldown to decay heat removal entry conditions. Although the EFW system capacity is sufficient to support a 500F per hour cooldown rate, this rate is not achievable during certain events, such as a natural circulation cooldown.
The UST and HW satisfy Criteria 2 and 3 of 10 CFR 50.36 (Ref. 4).
LCO To satisfy LCO requirements, the UST and HW must contain the specified volume of water available to the EFW System.
The OPERABILITY of UST and HW is determined by maintaining the tank volume at or above the minimum required volume.
APPLICABILITY In MODES 1, 2, 3, and in MODE 4, when steam generator is being relied upon for heat removal, the UST and HW are required to be OPERABLE.
In MODES 5 and 6, the UST and HW are not required because the EFW System is not required.
ACTIONS A.1 and A.2 If the requirements of the LCO are not met, the unit must be placed in a MODE in which the LCO does not apply, with the DHR System in operation. To achieve this status, the unit must be placed in at least MODE 3 within 12 hours1.388889e-4 days <br />0.00333 hours <br />1.984127e-5 weeks <br />4.566e-6 months <br />, and in MODE 4, without reliance on steam generators for heat removal, within 24 hours2.777778e-4 days <br />0.00667 hours <br />3.968254e-5 weeks <br />9.132e-6 months <br />. This allows an additional 6 hours6.944444e-5 days <br />0.00167 hours <br />9.920635e-6 weeks <br />2.283e-6 months <br /> for the DHR System to be placed in service after entering MODE 4.
OCONEE UNITS 1, 2, & 3 B 3.7.6-2 Amendment los. 330, 330, & 331 I
UST AND HW I
, I B 3.7.6 BASES ACTIONS A.1 and A.2 (continued)
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 SR 3.7.6.1 REQUIREMENTS This SR verifies that the UST and HW contain the required volume of cooling water. The 12 hour1.388889e-4 days <br />0.00333 hours <br />1.984127e-5 weeks <br />4.566e-6 months <br /> Frequency is based on operating experience and the need for operator awareness of unit evolutions that may affect the UST and HW inventory between checks. The 12 hour1.388889e-4 days <br />0.00333 hours <br />1.984127e-5 weeks <br />4.566e-6 months <br /> Frequency is considered adequate in view of other indications in the control room, including alarms to alert the operator to abnormal deviations in UST and I HW levels.
REFERENCES 1. UFSAR, Section 10.4.
- 2. UFSAR, Chapter 10.
- 3. UFSAR, Chapter 15.
- 4. 10 CFR 50.36.
OCONEE UNITS 1, 2, & 3 B 3.7.6-3 Amendment Nos. 330, 330, & 331 I