ML17305A328
| ML17305A328 | |
| Person / Time | |
|---|---|
| Site: | Palo Verde  |
| Issue date: | 10/26/1989 |
| From: | Office of Nuclear Reactor Regulation |
| To: | |
| Shared Package | |
| ML17305A327 | List: |
| References | |
| NUDOCS 8911010037 | |
| Download: ML17305A328 (8) | |
Text
EMERGENCY CORE COOLING SYSTEMS SURVEILLANCE RE UIREMENTS Continued g.
By verifying the correct position of each electrical and/or mechanical position stop for the following ECCS throttle valves:
1.
Within 4 hours4.62963e-5 days <br />0.00111 hours <br />6.613757e-6 weeks <br />1.522e-6 months <br /> following completion of each valve stroking operation or maintenance on the valve when the ECCS subsystems are required to be OPERABLE.
2.
At least once per 18 months.
Hot Le In'ection Valve Number Valve Number 1.
SIB-UV 615, SIA-HV 306 1.
SIC-HV 321 2.
SIB-UV 625, SIB-HV 307 2.
SID-HV 331 3.
SIA-UV 635 4.
SIA-UV 645 h.
By performing a flow balance test, during shutdown, following completion of modifications to the ECCS subsystems that alter the subsystem flow characteristics and verifying the following flow rates:
HPSI S stem - Sin le Pum The sum of the injection line flow rates, excluding the highest flow rate, is greater than or equal to 816 gpm.
LPSI S stem - Sin le Pum 2.
Injection Loop 1, total flow equal to 4800
+ 200 gpm Injection Legs 1A and 1B when tested individually, with the other leg isolated, shall be within 200 gpm of each other.
3.
Injection Loop 2, total flow equal to 4800 t 200 gpm 4.
Injection Legs 2A and 2B when tested individually, with the other leg isolated, shall be within 200 gpm of each other.
Simultaneous Hot Le and Cold Le In ection - Sin le Pum The hot leg flowrate is greater than ot equal to 525 gpm; 2.
The sum of the cold leg flowrates is greater than or equal to 525 gpm; and 3.
The total pump flowrate does not exceed 1200 gpm.
8911010037 891026 PDR ADOCK 05000529 P
PDC PALO VERDE - UNIT 2 3/4 5-6
(
, AMENDMENT NO.
29
1
EMERGENCY CORE COOLING SYSTEMS BASES ECCS SUBSYSTEMS (Continued) assurance that proper ECCS flows will be maintained in the event of a LOCA.*
Maintenance of proper flow resistance and pressure drop in the piping system to each injection point is necessary to:
(1) prevent total pump flow from exceeding runout conditions when the system is in its minimum resistance configuration, (2) provide the proper flow split between injection points in accordance with the assumptions used in the ECCS-LOCA analyses, and (3) pro-vide an acceptable level of total ECCS flow to all injection points equal to or above that assumed in the ECCS-LOCA analyses.
In specification 4.5.2.h, the specified flows include instrumentation uncertainties.
The requirement to dissolve'a representative sample of TSP in a sample of RWT water provides assurance that the stored TSP will dissolve in borated water at the postulated post-LOCA temperatures.
The term "minimum bypass recirculation flow," as used in Specification 4.5.2e.3.
and 4.5.2f., refers to that flow directed back to the RWT from the ECCS pumps for pump protection.
Testing of the ECCS pumps under the condition of minimum bypass recirculation flow in Specification 4.5.2f. verifies that the perfor-mance of the ECCS pumps supports the safety analysis minimum RCS pressure assumption at zero delivery to the RCS.
3/4.5.4 REFUELING WATER TANK The OPERABILITY of the refueling water tank (RWT) as part of the ECCS ensures that a sufficient supply of borated water is available for injection by the ECCS in the event of a LOCA.
The limits on RWT minimum volume and boron concentration ensure that (1) sufficient water plus 10K margin is avail-able to permit 20 minutes of engineered safety features pump operation, and (2) the reactor will remain subcritical in the cold condition following mixing of the RWT and the RCS water volumes with all control rods inserted except for the most reactive control assembly.
These assumptions are consistent with the LOCA analyses.
"The following test conditions, which apply during flow balance tests, ensure that the ECCS subsystems are adequately tested.
l.
2.
3.
The pressurizer pressure is at atmospheric pressure.
The miniflow bypass recirculation lines are aligned for injection.
For LPSI system, (add/subtract) 6.4 gpm (to/from) the 4800 gpm requirement for every foot by which the difference of RWT water level above the RWT RAS setpoint level (exceeds/is less than) the difference of RCS water level above the cold leg centerline.
PALO VERDE - UNIT 2 B 3/4 5-3 AMENDMENT NO.
b
EMERGENCY CORE COOLING SYSTEMS SURVEILLANCE RE UIREMENTS Continued g.
By verifying the correct position of each electrical and/or mechanical position stop for the following ECCS throttle valves:
1.
Within 4 hours4.62963e-5 days <br />0.00111 hours <br />6.613757e-6 weeks <br />1.522e-6 months <br /> following completion of each valve stroking operation or maintenance on the valve when the ECCS subsystems are required to be OPERABLE.
2.
At least once per 18 months.
LPSI S stem Valve Number Hot Le In'ection Valve Number 1.
SIB-UV 615, SIA-HV 306 1.
SIC-HV 321 2.
SIB-UV 625, SIB-HV 307 2.
SID-HV 331 3.
SIA-UV 635 4.
SIA-UV 645 h.,
By performing a flow balance test, during shutdown, following completion of modifications to the ECCS subsystems that alter the subsystem flow characteristics and verifying the following flow rates:
HPSI S stem - Sin le Pum The sum of the injection line flow rates, excluding the highest flow rate, is greater than or equal to 816 gpm.
LPSI S stem - Sin le Pum 2.
Injection Loop 1, total flow equal to 4800 + 200 gpm Injection Legs 1A and 1B when tested individually, with the other leg isolated, shall be within 200 gpm of each other.
3.
Injection Loop 2, total flow equal to 4800 2 200 gpm 4.
Injection Legs 2A and 2B when tested individually, with the other leg isolated, shall be within 200 gpm of each other.
Simultaneous Hot Le and Cold Le In'ection - Sin le Pum 1.
The hot leg flowrate is greater than or equal to 525 gpm; 2.
The sum of the cold leg flowrates is greater than or equal to 525 gpm; and 3.
The total pump flowrate does not exceed 1200 gpm.
PALO VERDE - UNIT 3 3/4 5-6 AMENDMENT NO.
19
1
EMERGENCY CORE COOLING SYSTEMS BASES ECCS SUBSYSTEMS (Continued) assurance that proper ECCS flows will be maintained in the event of a LOCA."
Maintenance of proper flow resistance and pressure drop in the piping system to each injection point is necessary to:
(1) prevent total pump flow from exceeding runout conditions when the system is in its minimum resistance configuration, (2) provide the proper flow split between injection points in accordance with the assumptions used in the ECCS-LOCA analyses, and (3) pro-vide an acceptable level of total ECCS flow to all injection points equal to or above that assumed in the ECCS-LOCA analyses.
In specification 4. 5. 2. h, the specified flows include instrumentation uncertainties.
The requirement to dissolve a representative sample of TSP in a sample of RWT water provides assurance that the stored TSP will dissolve in borated water at the postulated post-LOCA temperatures.
The term "minimum bypass recirculation flow," as used in Specification 4.5.2e.3.
and 4.5.2f., refers to that flow directed back to the RWT from the ECCS pumps for pump protection.
Testing of the ECCS pumps under the condition of minimum bypass recirculation flow in Specification 4.5.2f. verifies that the perfor-mance of the ECCS pumps supports the safety analysis minimum RCS pressure assumption at zero delivery to the RCS.
3/4.5.4 REFUELING WATER TANK The OPERABILITY of the refueling water tank (RWT) as part of the ECCS ensures that a sufficient supply of borated water is available for injection by the ECCS in the event of a LOCA.
The limits on RWT minimum volume and boron concentration ensure that (1) sufficient water plus 10K margin is avail-able to permit 20 minutes of engineered safety features pump operation, and (2) the reactor will remain subcritical in the cold condition following mixing of the RWT and the RCS water volumes with all control rods inserted except for the most reactive control assembly.
These assumptions are consistent with the LOCA analyses.
"The following test conditions, which apply during flow balance tests, ensure that the ECCS subsystems are adequately tested.
l.
2.
3.
The pressurizer pressure is at atmospheric pressure.
The miniflow bypass recirculation lines are aligned for injection.
For LPSI system, (add/subtract) 6.4 gpm (to/from) the 4800 gpm requirement for every foot by which the difference of RWT water level above the RWT RAS setpoint level (exceeds/is less than) the difference of RCS water level above the cold leg centerline.
PALO VERDE - UNIT 3 B 3/4 5-3 AMENDMENT NO. Ig
e
'I l