ML19308D395
| ML19308D395 | |
| Person / Time | |
|---|---|
| Site: | Crystal River  |
| Issue date: | 05/18/1977 |
| From: | Stewart W FLORIDA POWER CORP. |
| To: | |
| Shared Package | |
| ML19308D394 | List: |
| References | |
| NUDOCS 8002280706 | |
| Download: ML19308D395 (3) | |
Text
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l In Mode 1 ooe ration performing SP-110, regulating rod Group 6 exceeded its insertion l
7 0D 03 l limit by 5% contraN to Technical Specification 3.1.3.6.
Ot Redundancy N/A.
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The Groun was adiusted to within soecified limits in 12 j
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Rod Group 6 moved out of its enveJope because of xenon buildup and having Group 7 fully l
90 hl insertPd with sequence override in effect.
Persohnel cautioned to monitor rod index l
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SUPPLEMENTARY INFORMATION
%J 1.
Report No:
50-302/77-44 2.
Facility:
Crystal River Unit #3 3.
Report Date:
18 May 1977 4.
Occurrence Date:
27 April 1977 5.
Identification of occurrence:
Regulating rod insertion limits exceeded contrary to Technical Speci-fication 3.1.3.6.
6.
Conditions Prior to Occurrence:
Mode 1 power operation. Power reduced to approximately 2108 MWT in order to place Group 7 regulating rods in ful1 insertion during per-3 formance of Reactor Protective System Functional Test (SP-110).
f 7.
Description of Occurrence:
At 1950 on 27 Apr111977 during the performance of SP-110, Group 6 regulating control rods moved out exceeding insertion limits by 5%.
The Group was adjusted to within limits by 2002, an elapsed time of U
12 minutes.
8.
Designation of Apparent Cause of Occurrence:
Because of previous experience of Group 7 dropping into core (See LER-77-43), power was run back to allow full insertion of that group during performance of SP-110.
Subsequent xenon buildup caused Group 6 to withdraw but, because of sequence override, Group 7. remained fully in-serted.
Operator failed to observe that rod index limits were exceeded.
9.
Analysis of Occurrence:
There were no safety implications with this occurrence.
10.
Corrective Action:
Operations personnel have been instructed to monitor the rod index limits more closely, 11.
Failure Data:
This was the first occurrence of this type.
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