ML19308D253
| ML19308D253 | |
| Person / Time | |
|---|---|
| Site: | Crystal River  |
| Issue date: | 03/18/1977 |
| From: | Stewart W FLORIDA POWER CORP. |
| To: | |
| Shared Package | |
| ML19308D247 | List: |
| References | |
| NUDOCS 8002270705 | |
| Download: ML19308D253 (2) | |
Text
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[PLEASE PRINT ALL REQUli1ED INFam.1ATisN) e UCENSEE LCENSE EVENT NAME LCENSE NUMOErl TYPE TYPE l Fl Ll Cl Rl Pl 3l l0l0l-lO!0l0l0l0l-l0!0l l4 l1 l1l1l1l lnl1l 09 14 15 23 26 30 31 32 2
1 CATEGOftY T Pf ic DoCRET NUM0ER EVENT DATE AEPoAT DATE j
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EVENT CESCRIPTION l In Mode 3, in the process of recovering pressurizer level after Turbine / Reactor trin '
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7 89 l caused by inverter diode failure and subsequent RCS cooldown (LER 77-20).
0 the level of l
7 89 h l the BWST was reduced below the reauired level as defined hv Technf en1 Mnor4 ff ene4 en l
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@ l 3.1.2.9.b.l.
'No redundant systems were available and this event was not 60 renetitive.
Th e l 7 u9
$ l normal level 'of the EWST was 60 re-egab1f ahad nr nr en va-A n e r-r in e n vnAm ?
(77-23) l v
7 09 Es ocE COMPCNENT CCCE
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W l zl 9l 9 l 9 l lN l VOLATON 7 89 10 11 12 17 43 44 47 48 CAUSE DESCA:PTION O
Q l Approximately 20,000 gallons of borated water from the BWST was used to restore pressuri-l 7 88
@ l zer level which had dropped during RCS cooldown.
60 This was the correct action to be taken l 7 89 80
_ in response to the conditioTTs Dresent. Normal level was re-estabt f ahad.
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% POWER OTHER STATUS 0 CovtRY OtSCOVERY DESCA:PTCN W
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N/A l
1 7U 9
10 12 13 44 45 46 CO
[E E ED C EASE AMOUNT OF ACTMTY h
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l LoCATCN OF RELEASE N/A l
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10 11 44 45 PERSONNEL EXPOSURES 80 NuMeEn TYPE cEsCatPTON DE 101010I l_zf I N/A
_l 7 09 11 12 13 DO PERSONNEL INJURIES NUMOER CESCfDPTON
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N/A l
7 89 11 12 00 CFFSITE CONSEQUENCES gl N/A 7 09 l
LOSS OR OAMAGE TO FAC!uTY UD TYPE D
b b l ESCDtI' TON N/A
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- ADumONAL TACTOn3 See attached Supplementary Information.
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Supplementary Information i
j 1.
Report No:
50-302/77-23 i
2.
Facility:
Crystal k'.er Unit #3 4
3.
Report Date:
18 March 1977 i
4.
Occurrence Date:
2 March 1917 5.
Identification of Occurrence:
Reduction of level in Borated Water Storage Tank to below Technical Specification requirement (Technical Specification 3.1.2.9.b.1).
t 6.
Conditions Prior to Occurrence:
Plant was in Mode ? !s.uowing Turbine /~-actor trip and subsequent cool-
~
down.
7.
Description of occurrence:
At 1948 on 2 March 1977, failure of an output diode in "B" inverter caused Turbine / Reactor trip with attendant excessive cooldown rate as reported by LER 77-20.
At approximately 1955, in order to restore pressurizer level, makeup to the Reactor Coolant System from the BWST was commenced.
Approximately 20,000 gallona was used, reducing the volume in the tank from 420,000 gallons to approximately 400,000 gallons. The level in the tank was restored to greater than 415,000 gallons prior to re-entry into Mode 2.
8.
Designation of Apparent Cause of Occurrence:
As described above, operator action in response to dropping pressurizar level caused BWST level to reduce below Technical Specification requirement.
9.
Analysis cf Occurrence:
Using water from the BWST is the correct action under the conditions present.
With 400,000 gallons. remaining in the tank and the plant in Mode 3, there were no adverse safety consequences.
10.
Corrective Action:
No corrective action is required as operator action and system function were in accordance with requirements of the existing conditions.
l 11.
Failure Da'. :3 l
No previous events of this type have occurred.
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