ML20067A683
| ML20067A683 | |
| Person / Time | |
|---|---|
| Site: | Arkansas Nuclear  (DPR-51-A-142) |
| Issue date: | 02/04/1991 |
| From: | Office of Nuclear Reactor Regulation |
| To: | |
| Shared Package | |
| ML20067A685 | List: |
| References | |
| NUDOCS 9102070373 | |
| Download: ML20067A683 (2) | |
Text
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4.7.2 Control Rod Program Verification (Group Vs Core Positions)
Applicability Applies to surveillance of the control rod systems.
Ob.iective 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 (af ter test.
l 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 has 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 atta 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 edgewise meters in the control room.
In the event 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 transposso upon reconnection, these errors and transpositions l
will be discovered by a :omparative check by (1) selecting a specific rod f rom 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 cabic_ has been matched to the proper control rod drive asseshly.-
Amendment No. 203, 142 104 9102070373 9topo4 DR p
ADOCK 05000313'.
t deviates from its group average position by more than nine (9) inches.
Condi-tions for operation vith an inoperable rod are specified in Technical Specifi-cation 3 5 2.
REFERENCES (1) TSAR, Section ik 103
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