ML19308D522
| ML19308D522 | |
| Person / Time | |
|---|---|
| Site: | Crystal River  |
| Issue date: | 04/28/1977 |
| From: | Stewart W FLORIDA POWER CORP. |
| To: | |
| Shared Package | |
| ML19308D521 | List: |
| References | |
| NUDOCS 8002280961 | |
| Download: ML19308D522 (2) | |
Text
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LIC EN U kk kV E N i~ ILPUHT
,1 CCNTROL ULOCK:l l
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[PLCASS PntNT ALL RCouinED INTOlk.1AT:~
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Yv',"E ucENsE NUMern e!'lclnlpl1l l 0 l 0 l-l 0 l 0 l 0 l 0 l 0 l-l 0 l 0 l l4 l 1 l1 l1 l1 l l0 l3 l 7 09 14 15 25 as 30 31 32 "v7pf 3oM CAftcony coexET NUMutR EVENT DATE REPCAT DATC 0 1 CONT l - l - l W l Ll l 0l 5l 0l-l 0 l 3l 0 l 2 l l 0 l 4 l0 l4 l7 l7 l l 0 l 4 l2 l8 l7 l7 7 0 57 50 SS 60 61 68 69 74 75 UL EVENT DESCRIPTION O
l Reducine newer for maintenance Rod 6. Crono 7 would not move contrary to Technical 7 09 6L EE l Soecifiestion 3.1. 3.1. C.
There were no redundant systems available.
First occurrence 7 89 at EE l of this ern e.
System restored operable by renewing CRDM stator.
7 89 03 l BC
? U9 SC c l (1.ER-77-32) 7 03 mg 6C.
cbcE cooE ccMPCNENT CCOE A
VOLATON
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lD l1l5l0l lN l 7 89 10 11 12 17 43 44 47 48 CAUSE DESCRIPTION
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@l Failure of CRDM stator caused control fuse to blow making Rod 6, Group 7 inoperable.
l 7 89 GG hl Maintenance restored Rod 6 operable prior 'to plan't startup.
l 7 19 80 I
l FAC&lTV METH00 CF STATUS
% POWER OTHER STATUS OtSCOVtAY CISCOVERY OESCRPf;GN 8
ID I l0l4l1l l
N/A l
lAl l
N/A l
70 9
10 12 13 44 45 46 CO AYENc3 07 f SE AMCUNT Of ACTMTY LOCATCN OF RELE4.SE 8
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N/A l
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7 8 9
10 11 44 45 e0 PERSONNEL EXPOSURES NUMBER TYPE OLSCRIPTON 13 l0 l 010 l lzl l
N/A l
7 89 11 12 13 00 PERSONNEL INJURIES NUMOCR CEScnrPTON h l0 l0 l0l l
N/A l
7 09 11 12 00 OFFSITE CONSEQUENCCS 1
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7 09 UD LOSS On OAMAGE TO TACiUTY TYPE D
@ W l EECTtPTCN N/A l
7 u9 to c0 PUOttC11y 3l N/A j
? O9 CU
- &10lTIONAL FACTOn3 See attached Supolementarv Information l-
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Wi P. Stewart
.l rHONt: (813) AM _41 =o
SUPPLEMENTARY INFORMATION 1.
Report No:
50-302/77-32 2.
Facilitv:
Crystal River Unit #3 3.
Raport Date:
28 April 1977 4.
Occurrence Date:
4 April 1977 5.
Identification of Occurrence:
In the process of reducing power with Control Rod Group 7, Rod 6 of this group would not move contrary to Technical Specification 3.1.3.1.C.
6.
Conditions Prior to Occurrence:
~
Plant was reducing power in Mode I.
7.
Description of Occurrence:
At 1055, while reducing power for planned maintenance, Rod 6 of Group 7 was found to be inoperable. Manual movement of Rod 6 was attempted with no success. Trouble-shooting revealed that the fuse controlling Rod 6 was blown. Further investigation revealed the stator for Rod 6 CRDM had failed. The plant was shut down and after maintenance, Rod 6, Group 7 demonstrated and declared operable.
8.
Desianation of Apparent Cause of Occurrence _:
The primary cause of this event was the CRDM stator had failed which in turn caused this mechanism's fuse to blow, causing Rod 6 of Group 7 to become inoperable.
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1 9.
Analysis of occurrence:
l There were no safety implications as the Reactor could have been safely shut down at any time.
10.
Corrective Action:
l The CRDM stator and control fuse were renewed and Rod 6 of Group 7 was restored operable.
i 11.
Failure Data:
This occurrence was non-repetitive.
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