ML20080R630

Proposed Tech Spec Changes to Bases Re Operational Limits Associated W/Pressurizer Spray Nozzle

ML20080R630
Person / Time
Site:	Sequoyah
Issue date:	02/22/1984
From:	TENNESSEE VALLEY AUTHORITY
To:
Shared Package
ML20080R210	List: ML20080R208 ML20080R630
References
NUDOCS 8402280361
Download: ML20080R630 (2)

Text

. .

v REACTOR COOLANT SYSTEM

. ' BASES 3/4.4.9 PRESSURE / TEMPERATURE LIMITS The temperature and pressure changes during heatup and cooldown are limited to be consistent with the requirements given in the ASME Boiler and Pressure Vessel Code,Section III, Appendix G.

1) The reactor coolant temperature and pressure and system heatup and cooldown rates (with the exception of the pressurizer) shall be limited in accordance with Figures 3.4-2 and 3.4-3 for the first full power service period.

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a) . Allowable combinations of pressure and temperature for specific temperature change rates are below and to the right of the limit lines shown. Limit lines for cooldown rates between those presented may be obtained by interpolation.

b) Figures 3.4-2 and 3.4-3 deline limits to assure prevention of non-ductile failure only. For normal operation, other inherent plant .

characteristics, e.g., pump heat addition and pressurizer heater capacity, may limit the.heatuo'and cooldown rates.that can-be achieved over certain pressure-temperature ranges.

2) These limit lines shall be calculated periodically using methods provided below.

3) The secondary side of the steam generator must not be pressurized above 200 psig if the temperature of the steam generator is below 70 F.

4) The pressurizer heatup and cooldown rates shall not exceed 100*F/hr and 200*F/hr respectively. The spray shall not be used if the temperature dif{erence between the pressurizer and the spray fluid is greater than 560 F.

! 5) System preservice hydrotests and in-service leak and hydrotests shall be i performed at pressures in accordance with the requirements of ASME Boiler

! and Pressure Vessel Code,Section XI.

i The fracture toughness properties of the ferritic materials in the reactor vessel are determined in accordance with the NRC Standard Review Plan, and ASTM E185-73, and in accordance with additional reactor vessel require-ments. These properties are then evaluated in accordance with Appendix G of the 1976 Summer Addenda to Section III of the ASME Boiler and Pressure Vessel Code and the calculation methods described in WCAP-7924-A, " Basis for Heatup and Cooldown Limit Curves, April 1975."

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l REACTOR COOLANT SYSTEM

. ' BASES SPECIFIC ACTIVITY (Continued)

Reducing T,yg to less than 500 F prevents the release of activity should a steam generator tube rupture since the saturation pressure of the primary coolant is below the lift pressure of the atmospheric steam relief valves.

The surveillance requirements provide acrequate assurance that excessive specific activity' levels in the primary coolant will be detected in sufficient time to l take corrective action. Information obtained on fodine spiking will be used  !

toassesstheparametersassociatedwithTpikingphenomena. A reduction in ~

frequency of isotopic analyses following power changes may be permissible if justified by the data obtained.

l I

3/4.4.9 PRESSURE / TEMPERATURE LIMITS ,

The temperature and pressure changes during heatup and cooldown are limited to be consistent with th.e requirements given in the;ASME Boiler and Pressure Vessel Code,Section III,-Appendix G.

1) The reactor coolant temperature and pressure and system heatup and cooldown rates (with the exception of the pressurizer) shall be limited in accordance with Figures 3.4-2 and 3.4-3 for the first full power service period.

a) - Allowable combinations of pressure and temperature for specific temperature change rates are below and to the right of the limit lines shown. Limit lines for cooldown rates between those presented may be obtained by interpolation.

b) Figures 3.4-2 and 3.4-3 define limits to assure preventien of non-ductile failure only. For normal operation, other inherent plant

characteristics, e.g. , pump heat addition and pressurizer heater capacity, may limit the heatup and cooldown rates that can be achieved over certain pressure-temperature ranges.

2) These limit lines shall be calculated periodically using methods provided below.

3) The secondary side of the steam generator must not be pressurized above 200 psig if the temperature of the steam generator is below 70 F.

4) The pressurizer heatup and cooldown rates shall not exceed 100?F/ hr and 200*/hr respectively. The spray shall not be used if the temperature difference between the pressurizer and the spray fluid is greater than 560*F, SEQUOYAH - UNIT 2 B 3/4 4-6 as.= J Qtq p w a m _ _

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