ML19308D253

RO-77-23:on 770302,borated Water Storage Tank Level Reduced Below Tech Spec Requirement During Recovery Process from Turbine Reactor Trip.Caused by Personnel Dropping Pressure Level During RCS Cooldown.Normal Level re-established

ML19308D253
Person / Time
Site:	Crystal River
Issue date:	03/18/1977
From:	Stewart W FLORIDA POWER CORP.
To:
Shared Package
ML19308D247	List: ML19308D246 ML19308D253
References
NUDOCS 8002270705
Download: ML19308D253 (2)

Text

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• LCENSE EVENT l LCENSE NUMOErl TYPE TYPE 09 l Fl Ll Cl Rl Pl 3l 14 l0l0l-lO!0l0l0l0l-l0!0l 15 23 l4 26 l1 l1l1l1l lnl1l '

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. 1 CATEGOftY T Pf ic DoCRET NUM0ER EVENT DATE j Q 1 CON'T l - l - l 7 0 57 50 W 59 WGO l01SI0l-l0l3l0-l2l 61 10 l3 l0 l2 l7 l7 l l 0 l 3 l1 lR l7 l7 l{

AEPoAT DATE l

t 68 SS 74 75 60 EVENT CESCRIPTION O

7 89 l In Mode 3, in the process of recovering pressurizer level after Turbine / Reactor trin ' l1 0

l caused by inverter diode failure and subsequent RCS cooldown (LER 77-20) . the level of l 7 89 ,

7h 89l the BWST was reduced below the reauired level as defined hv Technf en1 Mnor4 ff ene4 en l l

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@ l 3.1.2.9.b.l.

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'No redundant systems were available and this event was not renetitive. Th e l 60

$ l normal level 'of the EWST was re-egab1f ahad nr nrv en va-A n e r-r in e n vnAm ? (77-23) l 7 09 Es ocE COMPCNENT CCCE VOLATON

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7 89 10 lAlClClUIMlU} W l zl 9l 9 l 9 l lN l 11 12 17 43 44 47 48 CAUSE DESCA:PTION O ,

7Q 88 l Approximately 20,000 gallons of borated water from the BWST was used to restore pressuri- l 60

@ l zer level which had dropped during RCS cooldown.

7 89 This was the correct action to be taken l 80

_ in response to the conditioTTs Dresent. Normal level was re-estabt f ahad.

l st  % POWER OTHER STATUS 0 CovtRY OtSCOVERY DESCA:PTCN 7U 1

9 W 10 l 0} 0l Ol l 12 13 N/A l W l N/A l 44 45 46 CO

[E E ED C EASE AMOUNT OF ACTMTY h

7 8 9 W dl10 11 N/A l 44 l

LoCATCN OF RELEASE N/A l 45 80 PERSONNEL EXPOSURES NuMeEn TYPE cEsCatPTON DE 101010I l_zf I N/A 7 09 11 12 13 _l DO PERSONNEL INJURIES NUMOER CESCfDPTON

[1,Li} l0 l 0 l 0 l l N/A 7 89 11 12 l 00 CFFSITE CONSEQUENCES gl .

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7 09 l LOSS OR OAMAGE TO FAC!uTY UD TYPE D b b

'/ u 9 to l ESCDtI' TON N/A

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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) .

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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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