ML20059J250
| ML20059J250 | |
| Person / Time | |
|---|---|
| Site: | Vogtle  |
| Issue date: | 11/04/1993 |
| From: | Office of Nuclear Reactor Regulation |
| To: | |
| Shared Package | |
| ML20059J254 | List: |
| References | |
| NPF-68-A-069, NPF-81-A-048 NUDOCS 9311120112 | |
| Download: ML20059J250 (2) | |
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PLANT SYSTEMS MAIN FEEDWATER ISOLATION SYSTEMS LIMITING CONDITION FOR OPERATION i
3.7.1.6 Four main feedwater isolation valves (MFIVs), four main feedwater regulating valves (MFRVs), and associated bypass valves shall be OPERABLE.
APPLICABILITY:* MODES 1 AND 2, except when the MFIV, MFRV or associated bypass valve is closed and deactivated.
j ACTION:
a.
With one MFIV, MFRV, or associated bypass valve inoperable in one or I
more feedwater lines, operation may continue provided each inoperable valve is restored to OPERABLE status or closed in each feedwater line within 72 hours8.333333e-4 days <br />0.02 hours <br />1.190476e-4 weeks <br />2.7396e-5 months <br />. Otherwise be in 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 />.
i b.
With no isolation system (each system consisting of a MFIV and its associated bypass valve or a MFRV and its associated bypass valve)
OPERABLE ** in any one feedwater line, restore at least one isola-tion system in each feedwater line to OPERABLE status within 4 hours4.62963e-5 days <br />0.00111 hours <br />6.613757e-6 weeks <br />1.522e-6 months <br /> or be in 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 />.
SURVEllLANCE REQUIREMENTS 4.7.1.6(a) Each MFIV, BFIV, MFRV and BFRV shall be demonstrated OPERABLE by verifying full closure within 5 seconds when tested pursuant to Specification 4.0.5.
The provisions of 4.0.4 are not applicable for entry into MODE 2.
t 4.7.1.6(b) For each inoperable valve, verify that it is closed or isolated l
once per 7 days.
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- Each MFIV, MFRV, or associated bypass valve shall be treated independently.
- An OPERABLE main feedwater isolation system may consist of inoperable valves provided the inoperable valves are maintained closed and deactivated.
V0GTLE UNITS - 1 & 2 3/4 7-9a Amendment No. 69 (Unit 1) i 9311120112 931104 I
D DR ADOCK 05000424 p
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PLANT SYSTEMS j
BASES 3/4.7.1.6 MAIN FEEDWATER ISOLATION SYSTEMS Isolation of the main feedwater (MFW) system is provided when required to mitigate the consequences of a steam line break, feedwater line break, feed-water controller malfunction, steam generator tube rupture or small break loss of coolant accident. Redundant isolation capability is provided by two isola-tion systems on each feedwater line consisting of the main feedwater isolation valve (MFIV) and its associated bypass valve (BFIV) and the main feedwater regulating valve (MFRV) and its associated bypass valve (BFRV). The safety function of these valves is fulfilled when closed. Therefore, a feedwater iso-i lation system may be considered OPERABLE if its respective valves are OPERABLE or if they are maintained in a closed and deactivated position. The 72 hour8.333333e-4 days <br />0.02 hours <br />1.190476e-4 weeks <br />2.7396e-5 months <br /> completion time to either restore or close an inoperable valve takes into account the redundancy afforded by the remaining OPERABLE valves and the low probability of an event occurring that would require isolation of the MFW flow paths during this time period. The 7 day completion time to verify that an inoperable valve is closed or isolated is reasonable based on valve status indications available in the control room, and other administrative controls to ensure the valves are closed or isolated.
I V0GTLE UNITS - 1 & 2 B 3/4 7-2a Amendment No. 69 (Unit 1)
Amendment No. 48 (Unit 2)
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