ML20204A384
| ML20204A384 | |
| Person / Time | |
|---|---|
| Site: | Maine Yankee |
| Issue date: | 05/01/1986 |
| From: | Maine Yankee |
| To: | |
| Shared Package | |
| ML20204A378 | List: |
| References | |
| NUDOCS 8605120149 | |
| Download: ML20204A384 (1) | |
Text
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M AINE Y ANKE E ATOMIC POWER COMPANY Basis (continued)
Hanual containment integrity valves may be repositioned provided that actions are taken to isolate the penetration by alternate means. As soon as practicable, but within seventy-two hours, the alternate means utilized, including associated piping, will be verified to meet the same design criteria as the original isolation.
Certain valves are allowed to be repositioned under administrative controls (e.g., written procedures) to effect required periodic tests and to allow I
certain required evolutions during startup and shutdown, including main steam line warmup, steam trap blowdown, and Residual Heat Removal (RHR) system operation.
Examples of uses of these valves are provided below.
These examples are not all inclusive.
The calorimeter isolation valves, MS-239, 241 and 243 are opened in order to perform planned calorimetrics.
The steam line vents, MS-48, 68 and 88, are open for several hours during heatup between reactor coolant temperatures of approximately 210*F and 300*F.
The steam trap drains, HPD-5, 10 and 15, are cycled open briefly during steam line warmup to blow down the steam trap.
The isolation valves to the blowdown tank, HPD-4, 9, and 14, are open during heatup and are closed prior to entering power operation.
The steam generator non-return valve bypasses, MS-50, 70, and 90, are opened during steam line warmup.
The Residual Heat Removal System valves, RH-4, 6, 7 and 26, are utilized when the Residual Heat Removal System is in service or when low temperature over pressure protection is in service.
PAP 1 and 4 are opened monthly to perform periodic surveillance of the hydrogen purge system in accordance with Technical Specifications (TS 4.11).
The inner door 0-ring test valves, IA-218, 219 and 220, are opened to allow testing of the inner containment door 0-ring.
Hydrogen analyzer inlet valves, PAP-23 and 24, return valves, IA-212 and 213,
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and stop valve PAP-25 are opened briefly during flow testing and during
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operation of the post accident hydrogen purge and analysis system.
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During the time that the steam line or stcam trap isolation valves are open, the reactor is either subtritical or at low power conditions. A membrane barrier separates the main steam system from the containment atmosphere and the reactor coolant system at all times.
The RHR system containment isolation valves are opened only with the primary coolant temperature (TS 3.4) equal to or less than minimum pressurization temperature. There is a membrane barrier between the containment atmosphere and the RHR system.
Blowdown and body vent valves on instrumentation lines are allowed to be
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repositioned under administrative controls (e.g., written procedures) to effect
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required calibration and maintenance. These administrative controls ensure
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containment boundary conditions are maintained fcilowing calibration and
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maintenance.
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8605120149 860505 PDR ADOCK 05000309 3.11-5 05/01/86 P
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