ML17311A434
| ML17311A434 | |
| Person / Time | |
|---|---|
| Site: | Palo Verde  |
| Issue date: | 11/30/1994 |
| From: | ARIZONA PUBLIC SERVICE CO. (FORMERLY ARIZONA NUCLEAR |
| To: | |
| Shared Package | |
| ML17311A431 | List: |
| References | |
| NUDOCS 9412050080 | |
| Download: ML17311A434 (6) | |
Text
REACTOR COOLANT SYST 3 4.4.2 SAFETY VALVES SHUTDOWN 4
LIHITING CONDITION FOR OPERATION 3.4.2.1 A minimum of one pressurizer code safety valve shall be OPERABLE with a lift setting of 8586-psia
+3, -1X*.
APPLICABILITY:
HODE 4.
ACTION:
a.
b.
With no pressurizer code safety valve OPERABLE, immediately suspend all operations involving positive reactivity changes and place an OPERABLE shutdown cooling loop into operation.
The provisions of Specification 3.0.4 may be suspended for up to 12 hours1.388889e-4 days <br />0.00333 hours <br />1.984127e-5 weeks <br />4.566e-6 months <br /> for entering into and during operation in HODE 4 for purposes of setting the pressurizer code safety valves under ambient (HOT) conditions provided a preliminary cold setting was made prior to heatup.
SURVEILLANCE RE UIREHENTS 4.4.2.
1 No additional Surveillance Requirements other than those required by Specification 4.0.5.
- The lift setting pressure shall correspond to ambient conditions of the valve at nominal operating temperature and pressure.
94i2050080 94ii30 PDR ADOCK 05000529 P
PDR PALO VERDE - UNIT 2 3/4 4-7 AMENDMENT NO. 61
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REACTOR COOLANT S'$STEH
.OP E AATING LIHITING CONDITION FOR OPERATION 3.4.2.2 l
pressurizer code safety valves shall be OPERABLE with a lift setting o
2500 psia +3, -IX*.
2475 APPLICA L TY:
HODES 1, 2, and 3.
ACTION With one pressurizer code safety valve inoperable, either restore the inoperable valve to OPERABLE status within 15 minutes or be.in at least HOT STANDBY within 6 hours6.944444e-5 days <br />0.00167 hours <br />9.920635e-6 weeks <br />2.283e-6 months <br /> and in HOT SHUTDOWN within the following 6 hours6.944444e-5 days <br />0.00167 hours <br />9.920635e-6 weeks <br />2.283e-6 months <br /> with the shutdown cooling system suction line relief valves aligned to provide overpressure protection for the Reactor Coolant
- System, SURVEILLANCE RE UIREMENTS 4.4.2.2 No additional Surveillance Requirements other than those required by Specification 4.0.5.
- The lift setting pressure shall correspond to ambient conditions of the valve at nominal operating temperature and pressure.
PALO VERDE UNIT 2 3/4 4-8 AMENDMENT NO. 61
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FOR INFORMATIONONLY 4 ~
Wf REACTOR COOLANT SYSTEM BASES PRESSURE/TEMPERATURE LIMITS Continued) similar LTOP system that includes two Shutdown Cooling System suction line relief valves for transient mitigation.
Each relief valve has an opening setpoint of 467 psig which, in combination with certain other limiting conditions for operation contained in Technical Specifications, comprises the LTOP system.
2475 Previously; the LTOP enabl temperatures during heatup and cooldown have been determined at the intersect s between a horizontal line corresponding to the safety valve setpoint
(
psla} and the most limiting P-T limit curves for heatup and cooldown, r pect'.vely.
Note that the enable temperature generally identifies the upper temperature limit below which the LTOP system has to be operable.
In this analysis, the LTOP enable temperatures were determined in accordance with a definition contained in the latest revision of the Standard Review Plan
- 5. 2. 2.
According to SRP
- 5. 2. 2 the LTOP enable temperature is "the water temperature corresponding to a metal temperature of at least RT T
+
9O~F at the beltline location (1/4T or 3/4T} that is controlling in tN Appendix G limit calculations."
The heatup and cooldown rate limitations assure the limits of Appendix G to 10 CFR 50 will not be exceeded with overpressure protection provided by the primary safety valves.
The various categories of load cycles used for design purposes are provided in Chapter 3
and 5 of the FSAR.
During startup and shutdown, the rates of temperature and pressure changes are limited so as 'not to e'xceed the limit lines of Figures 3.4-2a and 3.4-2b.
This ensures that the maximum specified heatup and cooldown rates are consistent with the design assumptions and satisfy the stress limits for cyclic operation.
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