ML18094B209
| ML18094B209 | |
| Person / Time | |
|---|---|
| Site: | Salem  |
| Issue date: | 12/19/1989 |
| From: | Public Service Enterprise Group |
| To: | |
| Shared Package | |
| ML18094B208 | List: |
| References | |
| NUDOCS 8912270262 | |
| Download: ML18094B209 (4) | |
Text
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UNIT 1 pg B3/4 4-17 UNIT 2 pg B3/4 4-6 pg B3/4 4-11 8912270262 891219 PDR ADOCK 05000272 P
PDC ATTACHMENT 1 DESCRIPTION OF CHANGE NLR-N89238 Replaced paragraph 3/4.4.10 with currently approved paragraph 3/4.4.10 Corrected paragraph number and type in paragraph lb Corrected typo for unit number in first paragraph
REACTOR COOLANT SYS~
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 rate (with the exception of the pressurizer) shall be limited in accordance with Figures 3.4-2 and 3.4-3 for the service period specified thereon.
- 2)
- 3)
- 4)
- 5) 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 prevention of nonductile 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.
These limit lines shall be calculated periodically using methods provided below.
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.
The pressurizer heatup and cooldown rates shall not exceed l00°Fjhr and 200°Fjhr, respectively.
The spray shall not be used if the temperature difference between the pressurizer and the spray fluid is greater than 320°F.
System preservice hydrotests and in-service leak and hydrotests shall be performed at pressures in accordance with the requirements of ASME Boiler and Pressure Vessel Code,Section XI.
The fracture toughness properties of the ferritic materials in the reactor vessel are determined in accordance with the NRC Standard Review Plan, ASTM El85-82, and in accordance with additional reactor vessel requirements.
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".
Heatup and cooldown limit curves are calculated using the most limiting value of the nil-ductility reference temperature, RTNDT' at the end of 15 effective full power years of service life.
The 15 EFPY service life period is chosen such that the limiting RTNDT at the l/4T location in the core region is greater than the RTNDT of the limiting unirradiated material.
The selection of such a limiting RT DT assures that all components in the Reactor Coolant System will ~e operated conservatively in accordance with applicable Code requirements.
SALEM - UNIT 1 B 3/4 4-6
REACTOR COOLANT SYS~
BASES 3/4.4.10 STRUCTURAL INTEGRITY The inspection programs for ASME Code Class 1, 2 and 3 components ensure that the structural integrity of these components will be maintained at an acceptable level throughout the life of the plant.
To the extent applicable, the inspection program for these components is in compliance with Section XI of the ASME Boiler and Pressure Vessel Code.
SALEM UNIT 1 B 3/4 4-17
BASES Finally, the new 10CFR50 rule which addresses the metal temperature of the closure head flange regions is considered. This 10CFR50 rule states that the metal temperature of the closure flange regions must exceed the material RTNDT by at least 120°F for normal operation when the pressure exceeds 20 percent of the preservice hydrostatic test pressure (621 psig for Salem).
Table B3/4.4-l indicates that the limiting RTNDI of 28°F occurs in the closure head flange of Salem Unit 2, and the minimum a lowable temperature of this region is 148°F at pressures greater than 621 psig.
These limits do not affect Figures 3.4-2 and 3.4-3.
Although the pressurizer operates in temperature ranges above those for which there is reason for concern of non-ductile failure, operating limits are provided to assure compatibility of operation with the fatigue analysis performed in accordance with the ASME Code requirements.
The OPERABILITY of two POPSs or an RCS vent opening of greater than 3.14 square inches ensures that the RCS will be protectd from pressure transients which could exceed the limits of Appendix G to 10 CFR Part 50 when one or more of the RCS cold legs are less than or equal to 312°F.
Either POPS has adequate relieving capability to protect the RCS from overpressurization when the transient is limited to either (1) the start of an idle RCP with the 0
secondary water temperature of the steam generator less than or equal to 50 F above the RCS cold leg temperatures, or (2) the start of a safety injection pump and its injection into a water solid RCS.
SALEM - UNIT 2 B 3/4 4-11