ML20244D754
| ML20244D754 | |
| Person / Time | |
|---|---|
| Site: | Catawba  |
| Issue date: | 06/12/1989 |
| From: | DUKE POWER CO. |
| To: | |
| Shared Package | |
| ML20244D752 | List: |
| References | |
| NUDOCS 8906190246 | |
| Download: ML20244D754 (2) | |
Text
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PLANT SYSTEMS STEAM GENERATGR POWER OPERATED RELIEF VALVES LIMITING CONDITION FOR OPERATION 3.7.1.6 Three steam generator power-operated relief valves (PORVs) and associated remote manual controls, including the safety-related gas supply systems, shall be OPERABLE.
APPLICABILITY: H0 DES 1, 2, 3, and 4.*
ACTION:
a.
With one less than the required steam generator PORVs OPERABLE, restore the inoperable steam generator PORV to OPERABLE status within 7 days; or be in at least HOT STANDBY within the next 12 hours1.388889e-4 days <br />0.00333 hours <br />1.984127e-5 weeks <br />4.566e-6 months <br />.
b.
With two less than the required steam generator PORVs OPERABLE, restore at least one of the inoperable steam generator PORVs to OPERABLE status within 72 hours8.333333e-4 days <br />0.02 hours <br />1.190476e-4 weeks <br />2.7396e-5 months <br /> or be in at 1 cast HOT STANDBY within the next 6 hours6.944444e-5 days <br />0.00167 hours <br />9.920635e-6 weeks <br />2.283e-6 months <br />.
SURVEILLANCE REQUIREMENTS 4.7.1.6 Each steam generator PORV and associated remote manual controls including the safety-related gas supply systems shall be demonstrated OPERABLE:
a.
At least once per 24 hours2.777778e-4 days <br />0.00667 hours <br />3.968254e-5 weeks <br />9.132e-6 months <br /> by verifying that at least one of the two nitrogen bottles associated with each PORV has a pressure greater than or equal to 2100 psig, and b.
At least once per 18 months and prior to startup following any refueling shutdown by verifying that all steam generator PORVs will operate through one cycle of full travel using remote manual controls and safety-related gas supply.
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- When steam generators are being used for decay heat removal.
CATAWBA - Units 1 & 2 3/4 7-9a
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~3/4.7.1.6 STEAM GENERATOR POWER OPERATED RELIEF VALVES The Surveillance Requirement for the Main Steam power-operated relief valves (PORVs) nitrogen' supplies ensures that the PORVs will be available to l
mitigate the consequences of a steam generator tube rupture accident concurrent with loss.of offsite power. This assumes that the PORV on the ruptured steam-generator is unavailable, and that the other two are.used to cool the Reactor Coolant System inventory to less than the saturation temperature of the ruptured-steam generator.
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. _ Concurrent with the requirement that a specific ncmber of PORVs be OPERABLE
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is the requirement that the associated PORV block valves upstream be open or OPERABLE. Should an associated PORV block valve be closed and inoperable, the PORV downstream of.that block valve should also be considered inoperable and the applicable ACTION statement shall be entered until such time that the block valve is opened or returned to OPERABLE status.
Additionally, if a PORV is inoperable and open, then the requirements of l
Technical Specification 3.6.3, Containment Isolation Valves, would apply in I
addition to Technical Specification 3.7.1.6.
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