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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I, . 1 6 NAME * (CENSE EVENI LICENSF NOMuf f) T yg'[
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' " Rod Group 6 moved out of its enveJope because of xenon buildup and having Group 7 fully l 00 hl
/ It 9 insertPd with sequence override in effect. Persohnel cautioned to monitor rod index l 7
% limits more closely.
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\ ) SUPPLEMENTARY INFORMATION
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- 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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