ML20198K067

Proposed Tech Specs Pages 3.8-2 & 4.8-1,changed to Specify Surveillance Frequency of Once Per Three Months

ML20198K067
Person / Time
Site:	Oyster Creek
Issue date:	12/23/1998
From:	GENERAL PUBLIC UTILITIES CORP.
To:
Shared Package
ML20198K038	List: ML20198K033 ML20198K058 ML20198K067
References
NUDOCS 9812300332
Download: ML20198K067 (2)

Text

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t 4.8 ISOLATION CONDENSER

, Apolicability:

- Applies to periodic testing requirements for the isolation condenser system, i:

. Obiective: To verify the operability of the isolation condenser system.

Specification: A. Surveillance of each isolation condenser loop shall be as follows:

. ] t_

tem Freauency

1. Operability of motor-- Once/3 months operated isolation valves j and condensate makeup valves. l 1

- 2.' Automatic actuation and Each refueling outage functional test. (interval not to exceed 20 months)or following major repair.

3. Shell side water volume Once/ day check 1

4. Isolation valve (steam side)

a. Visualinspection Each refueling outage

b. Externalleakage check Each primary system Leak test

c. Area temperature check Once/ shift l Basis: Motor-operated valves on the iso'ation condenser steam and condensate lines and on the condensate mak :up line that are normally on standby should be exercised periodically to make sure that they are free to operate. The valves will be stroaed full length every time they are tested to verify proper functional performance. This frequency of testing is consistent with instrumentation tests discussed in i-Specification 4.1. Testing of these components per ASME section XI once every 3 months provides assurance oravailability of the system. Also, at this frequency of testing, wearout should not be a problem

' throughout the life of the plant.

The automatic actuation and functional test will demonstrate the automatic opening of the condensate return line valves and the 4 automatic closing of the isolation valves on the vent lines to the main steam lines. Automatic closure of the isolation condenser steam and condensate lines on actuation of the condenser pipe break detectors l will also be verified by the test. It is during a major maintenance or

! repair that a system's design intent may be violated accidentally.

L This makes the functional test necessary after every major repair operation.

By virtue of normal plant operation the operators daily observe the

)~ water level in the isolation condensers. In addition, isolation condenser shell side water level sensors provide control room annunciation of condenser high or low water level.

9812300332 981223 PDR ADOCK 05000219 E

L 4.8-1 Amendment No.144 P PDR Q l:

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l 1

Each condenser containing a minimum total water volume of 22,730 gallons provides 11,060 gallons above the condensing tubes. Based on scram from a reactor power level of 1950 MWt (the design basis y'

~

power level for the isolation condensers) the condenser system can accommodate the reactor decay heat (2,3)(corrected for U-239 and NP-239) for I hour and 40 minutes without need for makeup water, ,

One condenser with a minimum water volume of 22,730 gallons can accommodate the reactor decay  !

heat for 45 minutes after scram from 1950 MWt before makeup water is required. In order to accommodate a scram from 1950 MWt and cooldown, a total of 107,500 gallons of makeup water j would be required either from the condensate storage tank or from the Hre protection system. Since the rated reactor power is 1930 MWt, the above calculations represent conservative estimates of the i isolation condenser system capability, ,

The vent lines from each of the isolation condenser loops to the main steam lines downstream of the main steam lines isolation valves are provided with isolation valves which close automatically on isolation condenser actuation or on signals which close the main steam isolation valves. liigh temperature sensors in the isolation condenser and pipe areas cause alarm in the control room to alert the operator of a piping leak in these areas.

Specification 3.8.E allows reduction in redundancy ofisolation capability for isolation condenser inlet (steam side) isolation valves. Reasonable assurance ofisolation capability is provided by testing the operability of the redundant valve. SpeciHcation 3.8.F allows short term inoperability of the AC motor-operated isolation condenser outlet (condensate retum) valve. It is not necessary to test the redundant 4 I

DC motor-operated valve as this valve is normally in the closed position. These speciGeations permit troubleshooting and repair as well as routine maintenance, such as valve stem packing addition or ,

replacement, to be performed during reactor operation without reducing the redundancy of the isolation condenser heat sink function. The out of service time of 4 hours4.62963e-5 days <br />0.00111 hours <br />6.613757e-6 weeks <br />1.522e-6 months <br /> is consistent with that permitted for primary containment isolation valves.(5) l Either of the two isolation condensers can accomplish the purpose of the system. Ifone condenser is found to be inoperable, there is no immediate threat to the heat removal capability for the reactor and j reactor operation may continue while repairs are being made. Therefore, the time out of service for one 1 of the condensers is based on considerations for a one out of two system.(4) The test interval for operability of the valves required to place the isolation condenser in operation is once/3 months (Specification 4.8). The allotted out of service time for an isolation condenser is conservatively set at seven days. Ilowever, if at the time the failure is discovered and the repair time is longer than 7 days, the reactor will be placed in the cold shutdown condition. If the repair time is not more than 7 days the i reactor may continue in operation, but as an added factor of conservatism, the motor operated isolation

condenser and condensate makeup valves on the operable isolation condenser are tested daily.  ;

l Expiration of the 7 day period or inability to meet the other speci6 cations requires that the reactor be i placed in the cold shutdown condition which is normally expected to take no more than 18 hours2.083333e-4 days <br />0.005 hours <br />2.97619e-5 weeks <br />6.849e-6 months <br />. The out of service allowance when the system is required is limited to the run mode in order to require system availability, including redundancy, at startup.

. OYSTER CREEK 3.8-2 Change No. 7

[ Amendment No.: 72,195 I

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