ML19345F456
| ML19345F456 | |
| Person / Time | |
|---|---|
| Site: | Crane  |
| Issue date: | 01/19/1981 |
| From: | Office of Nuclear Reactor Regulation |
| To: | |
| Shared Package | |
| ML19345F445 | List: |
| References | |
| NUDOCS 8102170513 | |
| Download: ML19345F456 (2) | |
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3/4.4 REACTOR COOLANT SYSTEM BASES l
3/4.4.1 REACTOR COOLANT LOOPS Several alternative methods are available for removal of reactor decay heat.
These methods include use of t$e Mini Decay Heat Removal System, the
" Loss to Ambient" cooling mode, and o;erstion of the Reactor Coolant System in the natural circulation mode with heat rejection via the long term "B" steam generator cooling mode.
Any one of these cooling methods provides adequate cooling of the reactor and each method is available for decay heat removal.
Procedures have been prepared and approved for use of these various cooling methods.
3/4.4.3 SAFETY VALVES The pressurizer code safety valves operate to prevent the RCS from being pressurized above its Safety Limit of 2750 psig.
Each safety valve is designed to relieve 348,072 lbs per hour of saturated steam at the valve's setpoint.
3/4.4.9 PRESSURE / TEMPERATURE LIMIT The RCS pressure and temperature will be controlled in accordance with approved procedures to prevent a nonductile failure of the RCS while at the same time permitting the RCS pressure to be maintained at a sufficiently high value to permit operation of the reactor coolant pumps.
Reactor coolant chemistry surveillance requirements are included in the Recovery Operations Plan.
These requirements provide assurance that localized corrosion or pitting in crevice areas, which could tend to promote stress corrosion cracking in heat affected zones of welds in stainless steel piping or components, will not occur. This assurance is provided by maintaining the reactor coolant dissolved oxygen concentration and pH to within the specified limits. The oxygen concentration must be limited since the chloride concen-tration is relatively high and cannot be reduced due to the unavailability of the purification demineralizers.
Hydrazine is used to control the oxygen i
concentration in the presence of metallic impurities in the reactor coolant.
THREE MILE ISLAND - UNIT 2 B 3/4 4-1 8102170:5I3
SURVEILLANCE REQUIREMENTS 4.4 REACTOR COOLANT SYSTEM REACTOR COOLANT LOOPS 4.4.1 Verify that surveillance of the Reactor Coolant System is being performed in accordance with procedures approved pursuant to Technical Specification 6.8.2.
t SAFETY VALVES 4.4.3 Not app;icable.
4.4.9 PRESSURE / TEMPERATURE LIMITS REACTOR COOLANT SYSTEM 4.4.9.1.1 The Reactor Coolant System pressure and temperature shall be determined to be within the limits at least once per 12 hours1.388889e-4 days <br />0.00333 hours <br />1.984127e-5 weeks <br />4.566e-6 months <br />.
4.4.9.1.2 The hydrogen concentration in the reactor coolant shall be determined to be at least 5 sec/kg of water at least once per 7 days.
4.4.9.1.3 The oxygen concentration in the reactor coolant shall be determined to be less than or equal to 0.1 ppm at least once per 7 days.
4.4.9.1.4 The pH of the reactor coolant shall be determined to be greater than or equal to 7.5 at least once per 7 days.
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THREE MILE ISLAND - UNIT 2 4.4-1 Change No. 5 l
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