ML20044B198

Proposed Tech Spec Re Control Rod Program Verification

ML20044B198
Person / Time
Site:	Arkansas Nuclear
Issue date:	07/10/1990
From:	ENTERGY OPERATIONS, INC.
To:
Shared Package
ML20044B197	List: ML20044B196 ML20044B198
References
NUDOCS 9007180088
Download: ML20044B198 (2)

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4.7.2 Control Rod Program Verification (Group Vs Core Positions)

Applicability Applies to surveillance of the control rod systems.

Objective To verify that the designated control rod (by core position) is operating in its programmed functional position and group (rods 1 through 12, group 1-8).

Specification 4.7.2.1 Whenever the control rod drive patch is reconnected (after test, reprogramming, or maintenance), each control rod drive mechanism shall be selected from the control room and exercised by movement of sufficient travel to verify that the proper rod hos responded as shown on the unit computer printout or on the input to the computer for that rod.

4.7.2.2 Whenever power or instrumentation cables to the control rod drive assemblies atop the reactor or at the bulkhead are disconnected or removed, an independent verification check of their reconnection shall be performed.

4.7.2.3 Any rod found to be improperly programmed shall be declared inoperable until properly programmed.

Bases Each control rod has a relative and an absolute position indicator system.

One set of outputs goes to the plant computer identified by a unique number associated with only one core position. The other set of outputs goes to a programmable bank of 68 e4ewise meters in the control room. In the went that a patching error is made in the patch panel or connectors in the cables leading to the control rod drive assemblies or the control room meter bank is improperly transposed upon reconnection, these errors and transpositions will be discovered by a comparative check by (1) selecting a specific rod from one group (e.g., rod 1 in regulating group 6); (2) noting the program-approved core position for this rod of the group, (3) exercising the selected rod, and (4) noting that a) the computer prints out both absolute and relative position response for the approved core position, and b) the proper meter in the control room display bank indicates both absolute and relative meter positions. This type of comparative check will not assure detection of improperly connected cables inside the reactor building. For these, (Specification 4.7.2.2) it will be necessary for a responsible person, other than the one doing the work, to verify by appropriate means that each cable has been matched to the proper control rod drive assembly.

Amendment No. 103 104

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