ML19345A479
| ML19345A479 | |
| Person / Time | |
|---|---|
| Site: | Yankee Rowe |
| Issue date: | 05/02/1977 |
| From: | YANKEE ATOMIC ELECTRIC CO. |
| To: | |
| Shared Package | |
| ML19345A477 | List: |
| References | |
| NUDOCS 8011210705 | |
| Download: ML19345A479 (4) | |
Text
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3/4.5 EMERGEPCY CORE C00LI:;G SYSTEMS (ECCS)
ACCU: ULAT0i'.
LIMITING CONDITION FOR OPERATION 3.5.1 The low pressure safety injection accumulator shall be OPERABLE with:
a.
Isolation valves open.
b.
A minimum useable contained borated vater volume of 700 cubic feet of borated water equivalent to an indicated level of 272" in the accumulator.
c.
A minimum boron concentration of 2200 PPM.
d.
An accumulator nitrogen cover-pressure of less than 15 psig.
The nitrogen supply system with three supply pressure regulating e.
valves set at 532 + 10 psig and at least:
1.
Sixteen 48 cubic foot nitrogen bottles > 1390 psig, or 2.
Seventeen 48 cubic foot nitrogen bottles > 1340 psig, or 3.
Eighteen 48 cubic foot nitrogen bottles > 1294 psig.
f.
Two OPERABLE low level venting systems.
g.
Timers set to operate between 6.4 and 7.2 seconds.
APPLICABILITY: MODES 1, 2, 3* 4* and 5*
ACTION:
With the accumulator inoperable, except as a result of a closed a.
isolation valve or as a result of one inoperable pressure regulating valve or one inoperable low level venting system, restore the inoperable accumulator to OPERABLE status within 15 minutes or be in at least HOT SHUTDOWN with main coolant pressure < 1000 psig within the next 8 hours9.259259e-5 days <br />0.00222 hours <br />1.322751e-5 weeks <br />3.044e-6 months <br />, b.
With the accumulator inoperable due to one isolation valve being closed, either immediately open the isolation valve or be in at least HOT STANDBY within one hour and be in at least HOT SHUTDOWN with main coolant pressure < 1000 psig within the next 8 hours9.259259e-5 days <br />0.00222 hours <br />1.322751e-5 weeks <br />3.044e-6 months <br />.
- Main coolant pressure 1 1000 psig.
YANKEE-ROWE 3/4 5-1 80112107 6
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. c.
With one inoperable supply pressure regulating valve or with one inopcrable low level venting system, restore the inoperable regulating valve or venting system to OPERABLE status within 8 haurs er te in at least EOT STA"CBY within one hour and be in at least HOT SHUT 001:M with cain coolant pressure < 1000 psig within the following 8 hours9.259259e-5 days <br />0.00222 hours <br />1.322751e-5 weeks <br />3.044e-6 months <br />.
SURVEILLANCE REOUIREMENTS 4.5.1 The accumulator shall be demonstrated OPERABLE:
a.
At least once per 12 hours1.388889e-4 days <br />0.00333 hours <br />1.984127e-5 weeks <br />4.566e-6 months <br /> by:
1.
Verifying the contained borated water volume, accumulator nitrogen cover-pressure, and the supply pressure-regulator discharge pressure, and 2.
Verifying that accumulator isolation valves SI-MOV-1 and SI-TV-608 are open.
b.
At least once per 31 days and within 6 hours6.944444e-5 days <br />0.00167 hours <br />9.920635e-6 weeks <br />2.283e-6 months <br /> after each solution volume increase of > 1% by verifying the boron concentration of the accumulator solution.
c.
At least once per 31 days by verifying the nitrogen supply -
bottle pressures, d.
At least once per 18 months during shutdown by:
1.
Verifying OPERABILITY of the nitrogen supply system by observing operation of each regulating valve while venting accumulator nitrogen pressure.
2.
Verifying OPERABILITY of each low level venting system when the level switch column water level is lowered.
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YANKEE-ROWE 3/4 5-2
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EiSlS 3/4.5.1 ACCb."_;.7" The OPERABILITY of the accumulator ensures that a sufficient volume of borated water will tc forced into the reactor core through each of the cold legs in the t u. tne Main Coolant System pressure falls below the pressure of th a::umulator. This initial surge of water into the core provides the cooling machanism d.cirg large Main Coolant System pipe ruptures.
The limits on accumulator volume, boron concentration and pressure ensure that the assumptions used for accumulator injection in the acci-dent analysis are met. A minimum useable water volume of 700 cubic feet require accumulator water volume to be at least 850 cubic feet.
The limits for operation with the accumulator inoperable for any reason except an isolation valve closed or pressurization system inoperable minimizes the time exposure of the plant to a LOCA event occurring concurrently which may result in unacceptable peak cladding temperatures.
If a closed isolation valve cannot be immediately opened, the full capability of the accumulator is not available and prompt action is required to place the reactor in a MODE where this capability is not required.
3/4.5.2 and 3/4.5.3 ECCS SUBSYSTEMS The OPERABILITY of three independent ECCS safety injection subsystems, the recirculation subsystem, and the long term hot leg injection sub-system ensures that sufficient emergency core cooling capability will be available in the event of a LOCA assuming the loss of one safety injection subsystem, one purification pump and one fixed speed charging pump through any single failure consideration. Two safety injection subsystems operating in conjunction with the accumulator are capable of supplying sufficient core cooling to limit the peak cladding temperatures within acceptable limits for all postulated break sizes ranging from the double ended break of the largest Main Coolant System cold leg pipe downward.
In addition, the recirculation and long term hot leg injection subsystems provide long term core cooling and boron mixing capability during the accident recovery period.
YANKEE-R0WE B 3/4 5-1 k
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Yankee Atccic Elect.. Company 5/2/J7 N. R. C.
Vestborough, Mass.
DATC HCC[lVE D 5/3/77 D. E. Vanderiburgh
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