ML20249C208

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Rev 24 to Selected License Commitments (SLC) Manual & SLC 16.10.1,dtd June 1998
ML20249C208
Person / Time
Site: McGuire, Mcguire  Duke Energy icon.png
Issue date: 06/09/1998
From:
DUKE POWER CO.
To:
Shared Package
ML20249C207 List:
References
PROC-980609, NUDOCS 9806260190
Download: ML20249C208 (9)


Text

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McGuire Nuclear Station I

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16.10 STI!AM AND POWER CONVERSION SYSTEMS O'

~Q MAIN STEAM SUPPLY SYSTEM 16.10.1 Steam Generator Power Operated Relief Valves (SG PORVs)

COMMITMENT l l

'Ihree SG PORV lines shall be OPERABLE. j APPLICABILITY MODES 1,2, and 3, MODE 4 when steam generator is relied upon for heat removal.

REMEDIAL ACTIONS

1. With one required SG PORV line inoperable, restore the inoperable SG PORV line to OPERABLE status within 7 days. (NOTE: Commitment 16.2.4 is not applicable.)
2. With two or more required SG PORV lines inoperable, restore all but one required SG PORV line to OPERABLE status within 72 hours8.333333e-4 days <br />0.02 hours <br />1.190476e-4 weeks <br />2.7396e-5 months <br />.
3. If the remedial action and associated completion time are not met, be in MODE 3 within 6 hours6.944444e-5 days <br />0.00167 hours <br />9.920635e-6 weeks <br />2.283e-6 months <br /> AND be in MODE 4 without reliance upon steam generator for heat removal within 12 hours1.388889e-4 days <br />0.00333 hours <br />1.984127e-5 weeks <br />4.566e-6 months <br />.

1 O

V IES rNG REQUIREMENTS .

1. ' Once every 18 months, verify one complete manual cycle of each SG PORV using the handwheel.
2. ' Once every 18 months, verify one complete manual cycle of each SG PORV block valve using the handwheel, l

REFERENCLS

1. Proposed Improved Standardized Technical Specifications for McGuire Nuclear Station Section 3.7. Plant Systems.
2. UFSAR, Section 10.3, Chapter 15.

BASIS

, Three SG PORV lines are required to be OPERABLE. One SG PORV line is required from each of three steam generators to ensure that at least one SG PORV line is available to conduct a unit cooldown following a SGTR, in which one steam generator becomes unavailable, accompanied by a single active failure of a second SG PORV line on an unaffected steam generator. The block valves must be OPERABLE to isolate a failed open SG PORV line. A

- closed SG PORV or block valve does not render it or its SG PORV line inoperable if operator action time to open the SG PORV and block valve is supponed in the accident analysis. Failure to meet this commitment can result in G

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the inability to cool the unit to RHR entry conditions following an event in which the condenser is unavailable for use with the Steam Dump System.

A Sd PORVline is considered OPERABLE when the SG PORV and its associated block valve are capable of fully opening and closing manually using the handwheel.

In MODES 1,2, and 3, and in MODE 4, when a steam generator is being relied upon for heat removal (i.e., when ND system is not being relied upon for heat removal), the SG PORV lines are required to be OPERABLE. In MODE 5 or 6, a SGTR is not a credible event.

With one required SG PORV line inoperable, action must be taken to restore OPERABLE status within 7 days. The .

7 day completion time allows for the redundant capability afforded by the remaining OPERABLE SG PORV lines, a nonsafety grade backup in the Steam Dump System, and MSSVs. Commitment 16.2.4 does not apply so that entry into an applicable mode is allowed with one SG PORV line inoperable.

With two or more required SG PORV lines inoperable, action must be taken to restore all but one required SG PORV line to OPERABLE status. Since the block valve can be closed to isolate a SG PORV, some repairs may be

' possible with the unit at power. The 72 hours8.333333e-4 days <br />0.02 hours <br />1.190476e-4 weeks <br />2.7396e-5 months <br /> completion time is reasonable to repair inoperable SG PORV lines, based on the availability of the Steam Dump System and MSSVs, and the low probability of an event occurring during this period that would require the SG PORV lines.

If the SG PORV lines cannot be restored to OPERABLE status within the associated completion time, the unit must be placed in a MODE in which this commitment does not apply. To achieve this status, the unit must be placed in at least MODE 3 within 6 hours6.944444e-5 days <br />0.00167 hours <br />9.920635e-6 weeks <br />2.283e-6 months <br />, and in MODE 4, without reliance upon steam generator for heat removal, within 12 hours1.388889e-4 days <br />0.00333 hours <br />1.984127e-5 weeks <br />4.566e-6 months <br />. He allowed completion times are reasonable, based on operating experience, to reach the required unit conditions from full power condition in an orderly manner and without challenging unit systems.

/~ To perform a controlled cooldown of the RCS, the SG PORVs must be able to be opened manually at the handwheel

(_N ^,) and throttled through their full range. This testing requirement ensures that the SG PORVs are tested through a full cycle at least once per fuel cycle. Operating experience has shown that these components usually pass the i acceptance criteria when performed at the 18 month frequency. The frequency is acceptable from a reliability standpoint.

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The function of the block valve is to isolate a failed open SG PORV. Manually cycling the block valve both closed and open demonstrates its capability to perform this function. Operating experience has shown that these components usually pass the acceptance criteria when performed at the 18 month frequency. De frequency is acceptable from a reliability standpoint.

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