ML20212H686
| ML20212H686 | |
| Person / Time | |
|---|---|
| Site: | Grand Gulf  |
| Issue date: | 06/18/1999 |
| From: | NRC (Affiliation Not Assigned) |
| To: | |
| Shared Package | |
| ML20212H691 | List: |
| References | |
| NUDOCS 9906280072 | |
| Download: ML20212H686 (4) | |
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Refueling Equipment Interlocks 3.9.1 3.9 REFUELING OPERATIONS 3.9.1 Refueling Equipment Interlocks LC0 3.9.1 The refueling equipment interlocks shall be OPERABLE.
~ APPLICABILITY:
During in-vessel fuel movement with equipment associated with the interlocks.
ACTIONS 4
1 CONDITION REQUIRED ACTION COMPLETION TIME l
l A.
One or more required A.1 Suspend in-vessel Immediately refueling equipment fuel movement with interlocks inoperable.
equipment associated with the inoperable interlock (s).
0_R A.2.1 Insert a control rod Immediately withdrawal block.
AND A.2.2 Verify all control Immediately rods are fully inserted in core cells containing one or more fuel assemblies.
GRAND GULF 3.9-1 Amendment No. 440, 138 9906290072 990618 i
PDR ADOCK 05000416 P
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Refueling Equipment Interlocks 3.9.1
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SURVEILLANCE REQUIREMENTS SURVEILLANCE FREQUENCY SR 3.9.1.1 Perform CHANNEL FUNCTIONAL TEST on each of 7 days the following required refueling equipment interlock inputs:
a.
All-rods-in, b.
Refuel platform position, and c.
Refuel platform main hoist, fuel loaded.
1 GRAND GULF 3.9-la Amendment No. -140,138
Refueling Equipment Interlocks B 3.9.1 BASES- (continued)
APPLICABILITY In MODE 5, a prompt reactivity excursion could cause fuel damage and subsequent release of radioactive material to the environment. The refueling equipment interlocks protect against prompt reactivity excursions during MODE 5.
The interlocks are only required to be OPERABLE during in-vessel
~ fuel movement with refueling equipment associated with the interlocks.
In MODES 1, 2, 3, and 4, the reactor pressure vessel head is on, and no fuel loading activities are possible. Therefore, the refueling interlocks are not required to be OPERABLE in these MODES.
ACTIONS A.I. A.2.1. and A.2.2 l
With one or more of the required refueling equipment interlocks inoperable, the unit must be placed in a condition in which the LCO does not apply or the Surveillances are not needed.
This can be performed by ensuring fuel assemblies are not moved in the reactor vessel or by ensuring that the control rods are inserted and can not be withdrawn.
Therefore, Required Action A.1 requires that in-vessel fuel movement with the affected refueling equipment must be immediately suspended. This action ensures that operations i
are not performed with equipment that would potentially not be blocked from unacceptable operations (e.g., loading fuel into a cell with a control rod withdrawn). Suspension of in-vessel fuel movement shall not preclude completion of movement of a component to a safe position.
Alternatively, Required Actions A.2.1 and A.2.2 require that a control rod withdrawal block be inserted and that all control rods subsequently verified to be fully inserted.
Required Action A.2.1 ensures that no control rods can be withdrawn. This action ensures that control rods cannot be inappropriately withdrawn because an electrical or hydraulic block to control rod withdrawal is in place. Required Action A.2.2 is performed after placing the rod withdrawal block in effect and provides a verification that all rods in core cells containing one or more fuel assemblies are fully inserted. The allowance to not verify that control rods associated with defueled cells are inserted is to allow (continued)
GRAND GULF B 3.9-3 Amem hent No. 138
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Re? aling Equipment Interlocks B 3.9.1 BASES ACTIONS A.I. A.2.1, and A.2.2 (continued) control rods to be withdrawn in accordance with LC0 3.10.6 while complying with these actions. This verification that all required control rods are fully inserted is in addition to the periodic verifications required by SR 3.9.3.1 and SR 3.10.6.2.
Like Required Action A.1, Required Actions A.2.1 I
and A.2.2 ensure that unacceptable operations are blocked (e.g., loading fuel into a cell with the control rod withdrawn.)
i SURVEILLANCE SR 3.9.1.1 REQUIREMENTS Performance of a' CHANNEL FUNCTIONAL TES' demonstrates each l
required refueling equipment interlock will function properly when a simulated or actual signal indicative of a required condition is injected into the logic. The CHANNEL FUNCTIONAL TEST may be performed by any series of sequential, overlapping, or total channel steps so that the entire channel is tested.
The 7 day Frequency is based on engineering judgment and is considered adequate in view of other indications of refueling interlocks and their associated input status that are available to unit operations personnel.
REFERENCES 1.
10 CFR 50, Appendix A, GDC 26.
2.
UFSAR, Section 7.6.1.1.
3.
UFSAR, Section 15.4.1.1.
GRAND GULF B 3.9-4 W Ib. 138
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