ML19319D008

RO 77-73E:on 770716,unplanned Radioactive Gas Released to Auxiliary Bldg During Makeup Tank Venting.Cause Undetermined & Being Investigated.Venting Ceased & Bldg Evacuated.Supply Air re-established & Ventilation Resumed When Alarm Cleared

ML19319D008
Person / Time
Site:	Crystal River
Issue date:	07/25/1977
From:	Stewart W FLORIDA POWER CORP.
To:
Shared Package
ML19319C998	List: ML19319C997 ML19319D008
References
NUDOCS 8003040935
Download: ML19319D008 (2)

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cATEcoRY "'N T NN occuff NUMBER

• EVENT CATE REPORf Catt lo I 7 i 2 I s 1717

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ECONT 57I -l l IT I L'J lo i s l o I-l o.13 lo 12 I in i viil a Iv I, I 74 75 7 8 58 59 60 61 68 69 E EVENT DESCRIPTION

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gl In mode 1 operation, in the progress of venting the makeup tank to the waste gas low- )

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g3 l pressure header, an unplanned radioactive gas release to the Auxiliary Building occurred j

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• 7 89 - 1 l Venting was

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gl contrary to' Environmental Technical Specification 5.6.2.A. _ i dundancy NA.

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7 89 .

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gl ceased and the Auxiliary Building was evacuated immediately. The supply air to the E 7 o9

@l Auxiliary Bldg. was re-established & ventilation resumad Jahen che mis m ~1 a n ra t l systiu cAuss co E *euT CoMaouEvT (LER 77-73E)

CODE CODE COMPONENT CCCE SLPautR MANUFACTURER VOLATON

, E IM la l lEl 7 89 10 11 lZ lZ lZ !Z lZ lz l 12 17 y

43 lZl9l9lg l 44 47 W48

l CAUSE DESCn:PTON ') 1

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oe lThe cause of this event is unknown at this time and is being investizated bv eha 91 ne __ ,

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{ gg l engineering staff. -

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]88 ,acury utTHoo oF High alar:n on 1WA 22 shutting off

$1ATUS  % POWER OTHER STATUS CISCOVERY DISC 5WAY tESCR'FIO71

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1 lE l l1l0l0l l NA l l^ l l Auxiliary Bldg. supply air fans.

7G 9 10 12 13 44 45 46 REL 5 C AMOUNT OF ACTMTV LoCATCN 08 RELEASE

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{ @E EASE l 1.8 curies noble gas l lRalease to Auxiliarv Blde. vent to ne w .

7 8 9 10 11 44 45 ,

C PERSONMEL EXPOSURES NUMBER TYPE DESCR@TCN

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33 l 0l 0l 0l 7 89 11

] 12 13 l NA E

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PERSONNEL INJURIES

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NUMBER DESCRIPTON ,

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1 101 ol al I ni 0

7 89 11 .1 2 OFFSITE CONSECUENCES

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7 8 '1 L LOSS OR OAMAGE TO FAC:UTY TYPE CESCR:PTON .

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1 1 MA 7 89 10 0 PUBUC!TY

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L-7 89 ADDITCNAL FACTORS sl This was a repetitive occurrence as reported by LER's77-49E & 77-61E ~ ,

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L 7 89 SEE SUPPLEMENTARY INFORMATION ACHED.

8003040f X NAME:

- 1. P. Stewart PHONE: (813) 866-4159

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.. SUPP1.EMENTARY INFORMATION

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4. Report No.: 50-302/77-73E

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2. Facility: Crystal River Unit #3 -

3. Raport Date: 25 July 1977

4. ,0ccurrence Date: 16 July 1977

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5. Identification of Occurrence:

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

6. Conditions Prior to Occurrence: .

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Mode 1 power operation.

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Description of Occurrence: 3

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At 2017 while venting the makeup tank to the waste gas lov pressure header, an i unplanned radioactive gas release to the Anrflf ary Building occurred. The maxi- .:

mum instantaneous release rate at the peak cf the discharge profile was .0063% "

i of the most restrictive limit set forth in Specification 2.4.2.A(1). When the radiation alarms cleared,the supply air was re-established to the Auxiliary Build-ing and ventilation resumed.

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S. Designation of Apparent Cause:  ;

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Unknown at this time.

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9. Analysis of occurrence:

The healch and safety of the plant and general public were not affected as the j maximum instantaneous release rates were not exceeded.

10. Cort active Action:

A concerted effort by plant enr' ag staff involving piping checks is underway to establish the cause, in ord' , define necessary corrective action. As yet, i no conclusion has beau reacher j l

11. Failure Data:

This was the third occurrence of an unplanned release originating from the waste gas system. See LER's 77-49-E dated 14 June 1977 and 77-61E dated 6 July 1977.

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