ML19308D201

RO-77-49E:on 770606,radwaste Gas Inadvertently Released. Caused by Blown Loop Seal of Waste Gas Decay Tank.Loop Seal re-established

ML19308D201
Person / Time
Site:	Crystal River
Issue date:	06/14/1977
From:	Stewart W FLORIDA POWER CORP.
To:
Shared Package
ML19308D199	List: ML19308D198 ML19308D201
References
NUDOCS 8002270665
Download: ML19308D201 (2)

Text

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O SUPPLDfENTARY INFORMATION b 1. Report No.: 50-302/77-49E

2. Facility: Crystal River Unit #3

3. Report Date: 14 June 1977

4. Occurrence Date: 6 June 1977'

5. Identification of Occurrence:

Unplanned release of radioactive waste gas contrary to Environ-mental Technical Specifications 5.6.2.A.

6. Conditions Prior to Occurrence:

d Normal Mode 1 Operation.

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 '

release to the Auxiliary Building occurred. The maximum instantaneous release rate at the peak of the discharge pro-file was 6.4% 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 s

) 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 sud safety of the plant and general public were

! not affect ..

. 10. Corrective Action:

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

11. Failure Data:

This was the first reportable occurrence of this type.

a 8 o os are [C5-

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LICENSEE EVENT REPORT CONTROL DLOCK:l l l l l l l (PLEASE PAINT ALL NtOUIRED INFO'1M AT*o7JJ

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LCENSE E NAME LCENSE NUP*0En

, LCtNSE EVENT f twE fvrE

(_)l 7 89 Fl Ll cl Rl Pl 3l 14 l0l0l-l0l0l0l0l0l-l0l0l25 l4l 15 26 l l l 30 l l0l4l C. 32 CATEGORY fY SU DOCKET NUMOEA EVENT DATE REPonf DATE

@ CONT l 7 8 57 l_l 58 W 59 W60 l ol gl ol-l ol ;l ol 2l 61 68 l ^' 6l 0l 6 l 7 l 7 l 49 74 l0l6l1l4l7l7l 75 00 EVENT DESCRIPTION DE l In Mode 1 c,peration, in the progress of venting the makeup tank to the waste gas low l 7 89 , .eO E@ l pressure header, an unplanned radioactive gas release to the Auxiliary Building occurred l 7 09 -

vo EE l contrary to Environmental Technical Soecifications 5.6.2. A. Redundancy N/A. Venting l 7 89 80 3E l vas ceased and buildine evacuated immediately. The sunolv nir to the Ativiliary Buf1dino!

7 09 80 MI was reestablished._andJantilation ranumed ufchin ehrpa minuraa (See Additional Factors) l 7 8 ,9 80 Sysrsu CAuSE covPora m Cwmtsr CODE CODE COMPONEPJT CODE SUPPUEA MANUFACTUAE R VOLATON (LER 77-49E)

Q lM l B l Q 7 89 10 11 l Zl Zl Zl Zl Zl Zl 12 < 17 l Zl 43 l 2l 9 l 9 l9 l 44 47 (N_j 48 '

CAUSE DESCRIPTION Q f O l This event was caused by blown 1000 seals to the unneo enn Inu nroccura hondor.  !

7 89 80 0 l Seals were reestablished and surveillnnce of chan 'ncrancad.

i l 7 09 80

\l l J

(j raCiufy 00 METHOo CF SeATUS 4 POWEn OTHER STATUS CISCOVEny oISCoVERY DESCArPTON 1

1 O! O!  ! N/A l lHichAlarmon RMA2e Shurrine Off Aur.  !

70 ,cgu 0, 10 12 13 44 45 46 Bldg. Supply Air Fans. 80 FELE SEo oF FASE AMOUNT OF ACTIVITY LOCATON OF RELEASE 1

7 8 9 W dl10 11 33 curies noble nas l 44 lReleasetoAux. Blde.. Vent to Atmos.

45 00 PERSONNEL EXPOSURES NUMBER TYPE DESCAtPTOPJ gg l 0l 0l d 7 89 11 Wl12 13 N/A 60 l

PERSONNEL INJUDIES NUMOEn DESCRIPTON DE I nl nl A ~

I N/A l 7 09 i1 12 80 ,

OrrSi1E CONSEQUENCES Ql 7 UD N/A - -

UO l

LOSS On OAMAGE TO FACILITY  !

TYPE DESCn!Prord D2 lZJ l n/A bU l  ;

7 89 10 PUDLICITY Ml N/A W

)

7 09

( pODITIONAL FACTORS hl 7 09 Surveillance of'the header loop seals was increased to preclude re-occurrence. l

, ,0 This was not a repetitive occurrence.

io I .

N.E .

1S b n ,0NE . (813) 866-4159

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