ML19317G213

RO 77-80E:on 770727,unplanned Radioactive Gas Released to Auxiliary Bldg While in Mode 1 Operation.Caused by Concentrated Waste Storage Tank Blown Loop Seals.Loop Seals re-established & Storage Tank Surveillance Increased

ML19317G213
Person / Time
Site:	Crystal River
Issue date:	08/03/1977
From:	Stewart W FLORIDA POWER CORP.
To:
Shared Package
ML19317G211	List: ML19317G210 ML19317G213
References
NUDOCS 8002280849
Download: ML19317G213 (2)

Text

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- LICENSEE EVENT REPORT 1

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'- ' h cONTROt otOCx:l l l l l l l cPLtASE 83RINT ALL HtOUIRED INFORLIAT CW 1 6 I NA E LCENSE NUMBER

• _ E TY E O1 7 89 lF lL l Cl Rl Pl 3l 14

. l 150 l 0-l-l 0 l 0 l 0 l 0 l 0 l-l 0 l 0 l l 4l 1l 1l 1l 1l l0 l4 l 25 26 30 31 32 c4TECoRY "'7P7' T $o7ASE coCKET NUMOEFe EVE'NT DATE REPORT cATE

@ CON'T l - l - l 7 8 57 50 959 M 60 l0l5lOl-l0l3l0l2l 61 68 l 0 l 7 l2 l7 l7 l7 l 69 l 0 l 8 l 0 l 3 l 71 7l 74 75 00 EVENT OESCRIPTION o l In mode 1 operation, an unplanned radioactive ga's release to the Auxil$.ary Building 7 89 l

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eg g l occurred contrary to Environmental Technical Specification 5.6.2. A. Redundancy NA. The '

7 00 ea O4 l Auxiliary Building was evacuated immediately and ventilation was resumed when the high- j 7 89 80

. Q l radiation alarms cleared. The fourth occurrence of this event.

7 09 l gg

@l 7 89 (LER 7.7-80E) l peut 80 SCI [E oE COMPONENT COCE SU MAN A VVLATON

• O lMlBl l_Ej lZlZlZlZlZlZl17 lZ l lZ l 9 l9 l9 l l Nl 7 89 10 11 12 43 44 47 48 CAUSE DESCRIPTION p

@ l This occurrence was due to the concentrated waste storage tanks loop seals being blown. l 7 89 80 h l The loop seals wera re-established and the surveillahce of them increased.

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FAC:UTY METHoo DF STATUS  % PoWEn oTHER STATUS DISCOVERY Q

78 9 l El l1 l0 l0 l l 10 12 13 NA 44 l lAl 45 oISCoVERY DESCRiPTON lHigh radiation on RMA-2g & 3g shutting l

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• 46 80 ACTUTY RELEASED CONTENT (See additional. factors 19)

AMCUNT oF ACTNTTY . LoCATON OF RELEASE 1

7 0 9 lGl $

of AELEASE l 2.7 curies noble gas l 10 11 44 l Release to Aux. Bldg. vent to atmosphere l 45 00 PERSONNEL EXPOSUAES NUMBER TYPE DESCRIPTON 13 l 0l 0l 0l 7 89 11 Wl 12 13

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60-PERSONNEL INJURIES

• NUMDER DESCRIPTON Q l0l0l0l11 12l 7 09 NA l

80 CFFSITE CONSEOUENCES

@l 7 00 NA

• l gg LOSS OR OAMAGE TO FAC:UTY VYPE CESCR:PTON .

7 00 10 LO PUBUC1TY 7

$l NA l

OITIONAL FACTCRS bh 7 00 See attached Supolementarv Information j L" 4'

][ off Auxiliary Bldg. sucolv air fana -

7 UU Hu NAME: ?U. P. Stevnrt

. rHONE: (813) 866-4159_

A OREL % s e n

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., ; SUPPLEMENTARY INFORMATION

-1. Report No.: 50-302/77-80E .

2. Facility: Crystal River Unit #3

3. Report Date: 4 August 1977

4. Occurrence Dates 27 July 1977

5. Identification of Occurrence:

Unplanned release of radioactive gas contrary to Environmental Technical Specification 5.6.2.A.

6. Conditions Prior to Occurrence:

Mode 1 power operation.

7. Description of Occurrence: e At 0950 high radiation alarms exceeding the Administrative limits were received from i radiation monitors RMA-2 & 3. The Auxiliary Building was immediately evacuated and invnstigation revealed the concentrated storage tanks loop seals had blown, causing an unplanned radioactive gas release. The maximum instantaneous release rate at the peak of the discharge profile was .066% of the most restrictive release limit set forth in ETS 2.4.2. A(1) . The loop seals were re-established and when the high radiation alarm cleared, the supply air to the Auxiliary Building re-started and ventilation resumed..

8. Designation of Apparent Cause:

Blown loop seals of the concentrated waste storage tanks causing a radioactive gas release to the Auxiliary Building.

9. Analysis of Occurrence:

4 The health and safety of the plant and public were not affected, as the maximum instantaneous release rates were not exceeding.

10. Corrective Action:

The blown loop seals were re-established and surveillance of them increased.

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) 11. Failure Data:

I This was the fourth occurrence of an unplanned release or1ginating from the waste gas system as reported by LER's77-49E, 77-61E, and 77-73E I

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