ML050680142
| ML050680142 | |
| Person / Time | |
|---|---|
| Site: | Arkansas Nuclear  |
| Issue date: | 03/07/2005 |
| From: | Office of Nuclear Reactor Regulation |
| To: | |
| Holland D, NRR/DLPM, 415-1436 | |
| References | |
| TAC MC2641 | |
| Download: ML050680142 (2) | |
Text
REACTOR COOLANT SYSTEM 3/4.4.9 PRESSURE/TEMPERATURE LIMITS REACTOR COOLANT SYSTEM LIMITING CONDITION FOR OPERATION 3.4.9.1 The Reactor Coolant System (except the pressurizer) temperature and pressure shall be limited in accordance with the limit lines shown on Figures 3.4-2A, 3.4-2B and 3.4-2C during heatup/criticality, cooldown, and inservice leak and hydrostatic testing operations with:
- a.
A maximum heatup of 50'F, 60'F, 700F or 800F in any one hour period in accordance with Figure 3.4-2A.
- b.
A maximum cooldown rate of 1000F per hour (constant) or 500F in any half hour period (step) for RCS cold leg temperatures between 500F and 5600F.
- c.
A maximum temperature change of*5 10°F in any one hour period during inservice hydrostatic and leak testing operations above the heatup and cooldown limit curves.
APPLICABILITY:
At all times.
ACTION:
With any of the above limits exceeded, restore the temperature and/or pressure to within the acceptable region of the applicable curve within 30 minutes; perform an engineering evaluation to determine the effects of the out-of-limit condition on the fracture toughness properties of the Reactor Coolant System; determine that the Reactor Coolant System remains acceptable for continued operations or be in at least HOT STANDBY within the next 6 hours6.944444e-5 days <br />0.00167 hours <br />9.920635e-6 weeks <br />2.283e-6 months <br /> and reduce the RCS Tc and pressure to less than 2000F and less than 500 psia, respectively, within the following 30 hours3.472222e-4 days <br />0.00833 hours <br />4.960317e-5 weeks <br />1.1415e-5 months <br />.
ARKANSAS - UNIT 2 3/4 4-22 Amendment No. 4,24, 256
Figure 3.4-2B COOLDOWN CURVE -32 EFPY COOLANT SYSTEM PRESSURE/TEMPERATURE LIMITS REACTOR 2500 I
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Lowest Seric 500 0
0 100 200 300 400 500 Reactor Coolant Temperature Tc, °F (Curves do not Include margins for Instrument uncertainties)
ARKANSAS - UNIT 2 3/4 4-23a 256 Amendment No. 4-24,24-2,