ML021050018
| ML021050018 | |
| Person / Time | |
|---|---|
| Site: | Oconee  |
| Issue date: | 04/02/2002 |
| From: | Mccollum W Duke Energy Corp |
| To: | Document Control Desk, Office of Nuclear Reactor Regulation |
| References | |
| Download: ML021050018 (10) | |
Text
jft Duke Sr4FEnergy° W R. McCollum, Jr.
Vice President April 2, 2002 U.
S. Nuclear Regulatory Commission Washington, D.
C.
20555 Attention: Document Control Desk
Subject:
Oconee Nuclear Station Docket Numbers 50-269, 270, and 287 Technical Specification Bases (TSB) Change Please see attached revisions to Technical Specification Bases (TSB) to TSB 3.3.28-1, Standby Pump Auto-Start Circuitry which reflects Table 3.3.28-1. The table provides correlation between the Siphon Seal Water System and LPSW Standby Pump Auto-Start Circuitry related to Operability. contains the new TSB pages and Attachment 2 contains the markup version of the Bases page.
If any additional information is needed, please contact Larry E. Nicholson, at (864-885-3292).
Very truly yours, oW.
R.
- cCollum, e President Oconee Nuclear Site Duke Energy Oconee Nuclear Station 7800 Rochester Highway Seneca, SC 29672 (864) 885-3107 OFFCE (864) 885-3564 FAX A Obbl
U.
S. Nuclear Regulatory Commission April 2, 2002 Page 2 cc:
Mr.
L.
N. Olshan Office of Nuclear Reactor Regulation U.
S. Nuclear Regulatory Commission Washington, D.
C.
20555 Mr.
L.
A.
Reyes, Regional Administrator U.
S. Nuclear Regulatory Commission - Region II Atlanta Federal Center 61 Forsyth St.,
SW, Suite 23T85 Atlanta, Georgia 30303 Scott Freeman Acting Senior Resident Inspector Oconee Nuclear Station Virgil R. Autry, Director Division of Radioactive Waste Management Bureau of Land and Waste Management Department of Health & Environmental Control 2600 Bull Street
- Columbia, SC 29201
B 3.3 INSTRUMENTATION B 3.3.28 Low Pressure Service Water (LPSW) Standby Pump Auto-Start Circuitry BASES BACKGROUND The LPSW Standby Pump Auto-Start Circuitry starts the standby LPSW Pump to ensure LPSW cooling water is available if a running pump does not restart following a Loss Of Offsite Power (LOOP) event and LPSW header pressure does not return to normal values within a predetermined amount of time.
The LPSW Standby Pump Auto-Start Circuitry consists of two safety grade pressure switches, and associated relays, time delays, switches, and indicator lights. The circuitry utilizes a two-out-of-two logic configuration. The actuation of the auto-start circuitry requires a low LPSW header pressure signal from both pressure switches.
Descriptions of the LPSW and ECCW Systems are provided in the Bases for LCO 3.7.7, "Low Pressure Service Water (LPSW)
System" and 3.7.8, "Emergency Condenser Circulating Water (ECCW)."
APPLICABLE SAFETY ANALYSES In the analysis of LOOP events, the LPSW Standby Pump Auto Start Circuitry is assumed to be OPERABLE to restart the standby LPSW Pump to ensure LPSW cooling water is available. For LOOP events, the LPSW System is required to support OPERABILITY of the SSW System, High Pressure Injection (HPI)
Pump Motors, and Motor Driven Emergency Feedwater (MDEFW) motors. The SSW System is a support system to the Emergency Condenser Circulating Water (ECCW) System. The SSW System is required to ensure ECCW siphon header piping remains sufficiently primed to supply siphon flow to the LPSW pump suction piping.
The LPSW Standby Pump Auto-Start Circuitry satisfies Criterion 3 of 10 CFR 50.36 (Ref. 1).
B 3.3.28-1 BASES REVISION DATED 03/19/02 OCONEE UNITS 1, 2, & 3
LPSW Standby Pump Auto-Start Circuitry B 3.3.28 BASES LCO LPSW Standby Pump auto-start circuitry shall be OPERABLE.
The circuitry includes a sensor channel and a logic channel. The LCO is modified by a NOTE indicating that this circuitry is not required to be OPERABLE on LPSW Pumps that are running.
This is acceptable because a running LPSW pump automatically restarts following a LOOP.
APPLICABILITY LPSW Standby Pump auto-start circuitry is required to be OPERABLE in MODES 1, 2, 3, and 4 to ensure LPSW cooling water is available during a LOOP with a single failure of an LPSW pump.
Mitigation of applicable Design Basis Events in MODES 5 and 6 does not rely on the auto-start of the LPSW Standby Pump; therefore, the LPSW Standby Pump auto-start circuitry is not required to be OPERABLE.
ACTIONS A.1 If the circuitry is inoperable, Required Action A.1 requires the LPSW Standby Pump Auto-Start circuit to be restored to OPERABLE status within 7 days.
The 7 day Completion Time is based upon the low safety significance of the auto-start circuitry.
If only one SSW header is in operation and the LPSW Standby Pump auto-start circuitry is inoperable on the same unit that is supplying the SSW header, the condition would be entered for all affected units. Reference Bases table 3.3.28-1. For example, if all three units are in MODE 1 and only the 'B' SSW header is in service and Unit 3 LPSW Standby Pump auto-start circuitry is inoperable, then all three units are in a 7 day action statement.
B.1 and B.2 Condition B applies when the Required Action and associated Completion Time of Condition A are not met. If Condition B applies, the unit must be placed in a MODE in which the LCO does not apply. 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 5 within 60 hours6.944444e-4 days <br />0.0167 hours <br />9.920635e-5 weeks <br />2.283e-5 months <br />.
B 3.3.28-2 BASES REVISION DATED 03/19/02 OCONEE UNITS 1, 2, & 3
LPSW Standby Pump Auto-Start Circuitry B 3.3.28 BASES ACTIONS B.1 and B.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 3.3.28.1 REQUIREMENTS A CHANNEL FUNCTIONAL TEST is performed on each LPSW Pump to ensure the auto-start circuit will perform its intended function. The Frequency of 18 months is based on engineering judgment and operating experience. Testing on an 18 month interval provides reasonable assurance that the circuitry is available to perform its safety function.
SR 3.3.28.2 A CHANNEL CALIBRATION is performed to verify that the components respond to the measured parameter within the necessary range and accuracy. The CHANNEL CALIBRATION leaves the components adjusted to account for instrument drift to ensure that the auto-start circuitry remains operational between successive tests. The Frequency is justified by the assumption of an 18 month calibration interval in the determination of the drift in the setpoint analysis.
REFERENCES
- 1.
B 3.3.28-3 BASES REVISION DATED 03/19/02 I OCONEE UNITS 1, 2, & 3
LPSW Standby Pump Auto-Start Circuitry B 3.3.28 BASES TABLE 3.3.28-1 Operability Status of SSW Headers Operability Status of LPSW Standby Pump Auto-Start Circuitry:
"A" and "B" SSW Header Operable "B" SSW Header Inoperable "A" SSW Header Inoperable Unit 3 Inoperable 0
7 day 7 day 0
7 day Completion Completion Completion Time Time on Unit Time on Unit on Unit 1, 2 and 3 per this TS 3 per this TS 3 per this TS.
Unit 1&2 Inoperable e
7 day 0
7 day 7 day Completion Completion Completion Time Time on Unit Time on Unit on Unit 1 and 2 1 and 2 per 1,2, and 3 per this TS.
this TS.
per this TS.
Unit 1,2and3 7day 7day 7day Inoperable Completion Completion Completion Time Time on Unit Time on Unit on Unit 1,2 and 1,2 and 3 per 1,2 and 3 per 3 per this TS.
this TS.
this TS.
NOTE: Table assumes Unit 1, 2, and 3 are in MODE 1, 2, 3, or 4.
B 3.3.28-4 BASES REVISION DATED 03/19/02 OCONEE UNITS 1, 2, & 3
LPSW Standby Pump Auto-Start Circuitry B 3.3.28 BASES LCO LPSW Standby Pump auto-start circuitry shall be OPERABLE.
The circuitry includes a sensor channel and a logic channel. The LCO is modified by a NOTE indicating that this circuitry is not required to be OPERABLE on LPSW Pumps that are running.
This is acceptable because a running LPSW pump automatically restarts following a LOOP.
APPLICABILITY LPSW Standby Pump auto-start circuitry is required to be OPERABLE in MODES 1, 2, 3, and 4 to ensure LPSW cooling water is available during a LOOP with a single failure of an LPSW pump.
Mitigation of applicable Design Basis Events in MODES 5 and 6 does not rely on the auto-start of the LPSW Standby Pump; therefore, the LPSW Standby Pump auto-start circuitry is not required to be OPERABLE.
ACTIONS A.1 If the circuitry is inoperable, Required Action A.1 requires the LPSW Standby Pump Auto-Start circuit to be restored to OPERABLE status within 7 days.
The 7 day Completion Time is based upon the low safety significance of the auto-start circuitry.
If only one SSW header is in operation and the LPSW Standby Pump auto-start circuitry is inoperable on the same unit that is supplying the SSW header, the condition would be entered for all aff ct For example, if all three units are in MODE 1 and
- Ionly the 'B' SSW header is in service and Unit 3 LPSW Standby geAr" 5.3.10 Pump auto-start circuitry is inoperable, then all three units are in a 7 day action statement.
S~B.1 and B.2 Condition B applies when the Required Action and associated Completion Time of Condition A are not met. If Condition B applies, the unit must be placed in a MODE in which the LCO does not apply. 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 5 within 60 hours6.944444e-4 days <br />0.0167 hours <br />9.920635e-5 weeks <br />2.283e-5 months <br />.
CaQO C4ýý dE X xxkr/z OCONEE UNITS 1, 2, & 3 B 3.3.28-2
^Men-t Noe. 3119, 9n 1*1
.1-
LPSW Standby Pump Auto-Start Circuitry B 3.3.28 BASES Operability Status of SSW Headers Operability Status "A" and "B" SSW "B" SSW Header "A" SSW Header of LPSW Standby Header Inoperable Inoperable Pump Auto-Start Operable Circuitry:
Unit 3 Inoperable 7 day 7 day 7 day Completion Completion Completion Time Time on Unit Time on Unit on Unit 1, 2 and 3 per this TS 3 per this TS 3 per this TS.
Unit 1&2 Inoperable 7day 7day 0 7day Completion Completion Completion Time Time on Unit Time on Unit on Unit 1 and 2 1 and 2 per 1, 2, and 3 per this TS.
this TS.
per this TS.
Unit 1,2and3 7day 7day 7day Inoperable Completion Completion Completion Time Time on Unit Time on Unit on Unit 1,2 and 1,2 and 3 per 1,2 and 3 per 3 per this TS.
this TS.
this TS.
NOTE: Table assumes Unit 1, 2, and 3 are in MODE 1, 2, 3, or 4.
B 3.3.28-4 BASES REVISION DATED XX/XX/02 K
/ /
OCONEE UNITS 1, 2, & 3