ML19308D137
| ML19308D137 | |
| Person / Time | |
|---|---|
| Site: | Crystal River  |
| Issue date: | 06/22/1977 |
| From: | Stewart W FLORIDA POWER CORP. |
| To: | |
| Shared Package | |
| ML19308D112 | List: |
| References | |
| NUDOCS 8002270617 | |
| Download: ML19308D137 (2) | |
Text
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l LIULNbLL: LVLl41. HLi'Ulil CONTnOL DLOC
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[PLEASC PnlNT ALL necutnt0 IrJron'.1At;r 1
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(Cf N ;t C to: Nr.C EVINT e4Aut (CENSC NUMOL89 Iv8T
!YPE g l Fl1. l Cl11 ll' l 3 l l0l0l-l0l0l0l0l0l-l0l0l l4l1 l1 l1 l 1l l 0l 3l 7 09 14 15 2b 26 30 31 32 cattoonY t$ c" so'b' tytNT oATE REPCnf oatt U
00Catt tauuntn c1COtril_l_l Ul l
lo ls lo l-l0 l3 lo l2 l l 0l 6l0 l1 l7 l7 l l 0 l 6 l 2 ] 2 l 7 l7 7 8 57 50 59 GO U1 68 GD 74 75 EVEfJT DESCR;PTION gg l In Mode 1 operation the CRD system failed to position the regulatina rods as' oer auto'
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7 89 Q l demand contrary to Technical Specification 3.1.3.1.
Redundancv was maintained by manual a
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3l l control.
This event was not repetitive.
Repairs to the auto ' rod control syst m vara 7 09
]Q l effected and the system restored operable.
7 89 gl (LER-77-54) 7 89 esnir
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'Nc's coot coutor4FNr ccer a
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VOLATON O
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lD l1 l 5 l 0-l lN l 7 89 10 11 12 17 43 44 47 48 5
CAUSE DESCDIPTION h
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l This event was caused by a loose connector on a CRD programmer printed circuit card.
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7 89 gg l The connector was repaired and restored operable.
7 89 Facilit y METHOo CF Status
% PoWE A CTHER STATUS CisCQVERY DISCOVERY CEScAt" TON
[E J l0 l9 l2 l l NA l
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NA 1
10 12 13 44 45 46 70 9
tcAu cF AMOUNT OF ACTIVITY LOCAftCN OF 8sELEASE RtttA$f0 08 lZ l Elf SE l NA l
l NA
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1 7 8 9
10 11 44 45 PEASONNEL EXPOSURES NUM0fA fvPE CISCRIPTION 1
l 0l 0l 0l yl NA 7 89 11 12 13 PERSONNEL INJunIES NUMGER CESCRipfCN E l0l 0l 0l l
NA 7 89 11 12 OFFSITE CONSECUENCES NA l
7 09 i
LOSS OR UAMAGE TO FAC:UTY T Y f't OESCRATCN
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l NA 1
7 09 10 PUDUC!TY l
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@l NA JD 7 80 400mONat r4CTenS 8 0 0 2 2 7 0 3 /.'T
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SUPPLEMENTARY INFORMATION
(, ~~/ 1. Report No. :-
s _-
50-302/77-54 s
- 2. Facility:
Crystal River Unit #3
- 3. Report Date:
22 June 1977 4
- 4. Occurrence Date:
1 June 1977
- 5. Identification of occurrence:
Failure of Control Rod Drive System to position regulating rods as per auto demand contrary to Technical Specification 3.1.3.1.
- 6. Conditicas Prior to Occurrence:
Mode 1 operation increasing load.
- 7. Description of Occurrence:
At 0535 while increasing load to 92% the automatic rod control failed to respond 7
to a transient neutron error causing reactor power to exceed the power cutoff level.
The rod control system was placed in manual. control and power was reduced from approximately 95% to 92%'.
When again placed in automatic control CRD system inter-mittently faile.d to respond per demand.
The rod control system was placed in auxiliary power and manual mode of operation.
Investigation revealed that there
~s was a loose connector on a printed circuit card of the CRD programmer.
Repairs were effected and the system restored operable'.
l
- 8. Designation of Apparent Cause:
]
These occurrences were caused by a loose printed circuit. card connector in the l
CRD programmer.
I
- 9. Analysis of Occurrence:
t There were no safety implications as the CRD. system was manually controlled.
- 10. Corrective Action:
The loose connector on the.P.C.
card was repaired and the reamining P.C. card connectors were checked and verified satisfactory.
- 11. Failure Data:
)
These events constitute the first occurrence of this type.
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