ML19308E005

RO 77-49E:on 770606,unplanned Radwaste Gas Release Occurred During Makeup Tank Venting.Caused by Waste Gas Decay Tank Blown Loop Seal,Connected to Waste Gas Low Pressure Header. Seals re-established & Their Surveillance Increased

ML19308E005
Person / Time
Site:	Crystal River
Issue date:	06/14/1977
From:	Stewart W FLORIDA POWER CORP.
To:
Shared Package
ML19308E002	List: ML19308E001 ML19308E005
References
NUDOCS 8003200740
Download: ML19308E005 (2)

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UCENSbb EVENI HEPUHI

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, , CONTROL DLOCK:l l l l l l [pt SE PRINT ALL REZUIREJ INFEM.1 AT*CTJ

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1. LCENSE EVENT NAME LCINSE NUMBER

• fvPE- TYPE o1 l Fl Ll Cl Rl Pl 3l 7 89 14 l150l 0l-l 0l 0l 0l 0l 0l-l 0l 0l l4l 25 26 l l 'l l l0l4l 30 31 32 cArtcoRY "'N NE 1 OoCKET NUM0ER EVENT DATE REPORT DATE 7 u 04 CONTl=l b7 LO l Ltl b9 LtJ l o f si ol-l a l a l o l 21 Iof61of617171 101611141717 60 61 60 09 74 75 Ut EVENT DESCR4PTION DE l In Mode 1 operation, in the progress of venting the makeup tank to the waste gas low j 7 09 Out BE I pressure header, an unplanned radioactive nas release to the Auxiliary Building occurred l 7 il D -

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7 09 contrary to Environmental Technical Specifications S.6.2.A. Redundancy N/A. Ventina l 80 3E l was ceased and building evacuated immediately. The nunolv air to the Aurf 11 mrv Buildino-l 7 0

@9 7 89 l was reestablished And 3RDt41 n rion rounmad uichin chroa minne...(See Additional Factors) l O(*

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' 'SS" C0OE COMPONf NT CODE R M u R VIOLATON (LER 77-49E)

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7 80 10 11 l Z l 2 l Zl Zl Zl Zl 12 17 43 l2l9l9l9l 44 47 W48 CAUSE DESCRIPTION 9

EE l This event was caused by blown loon senin to rho un=co one Inu nr = auro h. A., l 7 89 -

80 SE I seals were reestablishea and surveritance ne cham 7 09

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4 I 80 DE I I 7 09 fatnny METHOD OF 00 Status  % POWER OTHER STATUS DISCOVEny DISCOVERY DESCMTON 1

7 0 9 10 l l! ol o! ! N/A l lHiohAlarmon RMA2e Rhurrine Off Anv. l

,aay o, 12 i3 44 45 46 -

80 Bldg. Supply Air Fans.

ACrmTY C04ffNT

• flELE ASE D AMOUNT OF ACTMTY LOCATON OF AELEASE 30 7 8 9 W OF dF'ELEASE 10 l

33 curies noble nas l lReleasetoAux. Bldg.. Vent to Atmos.  !

11 44 45 00 SERSONNEL EXPOSURES NUMDEA TYPE DESCRIPTICW Q l 0] 0l d 7 89 11

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13-N/A l GD PERSONNEL. INJuniES NuMcAn OESC p TON 3l l nl nl d ~

l N/A l 7 09 ' i1 12 uo OFFSITE CONSEQUENCES Ql 7 UD N/A -

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l 00 LOSS OR DAMAGE TO FACluTY TYPE DESCR'PTION ,

hdl 7 89 10 N/A f

I;o PUDUCtTY BE I 7 89 N/A pi j

AODtitONAL FACTORS E l Surveillance of the header loop seals was increased to preclude re-occurrence.

7 gg ---....l This was not a repetitive occurrence.

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• NAME: k PHONE: (813) 866-4159 .

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-SUPPLEMENTARY INFORMATION

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l. Report No.: 50-302/77-49E

2. Facility: Crystal River Unit #3

3. Report Date: 14 June 1977

4. Occurrence Date: 6 June 1977

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5. Identification of occurrence:

! Unplanned release of radioactive waste gas contrary to Environ-

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mental Technical Specifications 5.6.2.A.

6. Conditions Prior to Occurrence:

Normal Mode 1 Operation.

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7. Description of occurrence:

At 1400 in the progress of venting the makeup tank to the waste gas low pressure header, an unplanned radioactive gas t

release to the Auxiliary Building occurred. The maximum i instantaneous release rate at the peak of the discharge pro-file was 6.47. of the most restrictive limit set forth in Specification 2.4.2A. (1). Supply air to the Auxiliary Building was re-established and ventilation of the building resumed

, within three minutes.

8. Designation of Apparent Cause:

Blown loop seal of waste gas decay tank connected to waste gas low pressure header.

9. , Analysis of Occurrence:

The health and safety of the plant and general public were not affected.

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10. Corrective Action:

i i The loop seal was re-established and surveillance of loop seals has been increased to preclude re-occurrenca.

11. Failure Data:

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This was the first reportable occurrence of this type.

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