ML20199B245
| ML20199B245 | |
| Person / Time | |
|---|---|
| Site: | Haddam Neck File:Connecticut Yankee Atomic Power Co icon.png |
| Issue date: | 06/06/1986 |
| From: | CONNECTICUT YANKEE ATOMIC POWER CO. |
| To: | |
| Shared Package | |
| ML20199B232 | List: |
| References | |
| NUDOCS 8606170083 | |
| Download: ML20199B245 (1) | |
Text
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2.4 M*ximum S*f aty Settings - Prrt7.ctiva Instrument *. tion Applicability:
Applies to trip settings for instruments monitoring reactor power and reactor coolant pressure, temperature, and flow.
Objective:
To provide for protective action in the event that the principle process variables approach a safety limit.
Specification:
Protective instrumentation trip settings shall be as follows:
Four Reactor Coolant Three Reactor Coolant Pumps Operating Pumps Operating (1)
Pressurizer Pressure A 2300 psig 4 2300 psig (2)
Pressurizer Level
- A 86% of range d 86% of range (3)
Variable Low Pressure * *
- 417.4 (Tavg+1.17AT)-8850 217.4(Tavg+1.17 T)-8850 (4)
Nuclear Overpower *
- d 109% of rated power 174% of rated power (5)
Low Coolant Flow ***
2 90% of normal loop flow 290% of normal loop flow (6)
Reactor Coolant Loop Valve-Temperature
.4 200F A 200F Interlock (7)
High Steam Flow 110% of full load steam 110% of full load steam flow flow May be bypassed when the reactor is at least 1.5%Ak subcritical.
The nuclear overpower trip is based upon a symmetrical core power distribution. If any asymmetric power distribution should occur, resulting in the power in any quadrant being 2% greater than the average core power as indicated by the neutron detectors, within 2 hours2.314815e-5 days <br />5.555556e-4 hours <br />3.306878e-6 weeks <br />7.61e-7 months <br /> either a) reduce the QUADRANT POWER TILT RATIO to within its limit, or b) reduce thermal power at least 3% from RATED THERMAL POWER for each 1% of indicated QUADRANT POWER TILT RATIO in excess of 1.0 and similarly reduce the Nuclear Overpower trip setpoint within the next 4 hours4.62963e-5 days <br />0.00111 hours <br />6.613757e-6 weeks <br />1.522e-6 months <br />.
The QUADRANT POWER TILT RATIO shall be determined to be within the limit above 50% of RATED THERMAL POWER by calculating the ratio at least once per 7 days.
When the reactor power is 410% the overpower trip setpoint is reduced to 25% of rated power.
May be bypassed below 10% of rated power.
Basis:
The reactor protective system is designed and constructed such that no single failure in any of the instrument systems will prevent the desired safety action if an applicable parameter exceeds a safety setpoint.
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