ML19308D466

RO 77-93E:on 770729,probable Unplanned Radioactive Gas Release to Auxiliary Bldg Occurred.Caused by Blown Loop Seal on Waste Evaporator.Loop Seal re-established on Each Occurrence

ML19308D466
Person / Time
Site:	Crystal River
Issue date:	08/12/1977
From:	Stewart W FLORIDA POWER CORP.
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II)
Shared Package
ML19308D443	List: ML19308D442 ML19308D466
References
NUDOCS 8002280777
Download: ML19308D466 (2)

Text

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UCENSEE EVENT REl-dHI CONTROL BLOCK:l l l l l l l (PLEASE PAINT ALL REQUIRED INFC"T.1AT:C UCENSEE UCENSE EVENT

1. NAME UCENst NUM8ER , TYPt TYPE 01 l F l L l Cl R l P l 3 l 14 l0l0l-l0l0l010l0l-l0l0l25 15 l 4 l 1 !1 l1 l1 l 26 30 lo la l 31 32 7 89 ,

c4Tecen "'E4' E'uE coexET NUMBER EVENT CATE REPoAT cATE

. @ CONT l "l -l lTl lLl l0 l5 l0 l-l013 l0 l268l l nl vl,I o l r I, I SS 74 l0 l8 !Il2l7l 75 7 8 57 38 59 60 61 EVENT DESCRIPTION .

gg l In = ode 1 operati:n, it was determined on' 4 August 1977 by the PRC that on 29 fulv' ~

7 .8 9 g l and 2 August 1977, probable unplanned radioactive gas releases to the Auxiliary Building 7 89 gg l occurred contrary to E.T.S. 5.6.2.A. Redundancy NA. The fifth occurrence of this 7 89 Q l event. Due to the brevity of these releases there were no t easurabic chat ces % ^=

7 09 )

,, nE l continuous release concentrations. (LER 77-93E) l 7 89 pas I

• EE $$s' teupoNENT cect VCLATCN .

a 7 89 10 lM l3 l lEl 11 lZ l Zl Zl Zl ZI Zl 12 17 l Zl 43 44 l Z l9 l 9l 9l 47 d48 , ', J CAUSE DESCRIPTION /

le l These occurrences vere caused bv a bicvn loco seal on the waste evaoorator. Se loon 7 89 -

_~-  ! seal was re-established on each occurrence.

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'/TE s powen 'cTwen status "esSeaY escovany cesemmcN 1 (2l l1l0l0l l ' NA l l Al l High radiation alarm on RMA-2e 7G 9 10 12 13 44 45 46 amount oF acDVITY LoCADcM CF REEASE IIIil lGl o7Ye'tEIsa INl l Noe measurable l 44 45 l Auxiliary w w--

7 8 9 10 11 PERSONNEL EXPOSURES NUMSER TYPE DESCRWT'CN 1 83 l0l0l0l 7 89 11 d!12 13 st s PERSONNEL INJUAIES Nuu8am CEsemmcN ,

_ 3 l0!Ol0l 7 89 11 12 l 4A OFFSITE CONSECUENCES .

7 89 J Q c JU LDSS OR DAMAGE TO FAC:UTY n' -

O Typt esscarncN , D 1 L;J l m .

n u-vi i /A1 7 89 10 .A u u Q PUSUCITY NA l 1 l 7 89 .

ACCIT!CNAL FACTCRS h6 O 2 ff g g

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7 89 l _

(IEj l SEE AT* ACHED SUPPLEMEITARY INFORMATION

7 89 l NAME. J. P. Stewart -

PWCNE: 813/866-4150 l

• cro nes... l

. SUPPLEMENTARY INFORMATION

1. Report No.: 50-302/77-93E

2. Fscility: Crystal River Unit #3

3. Report Date: 12 August 1977

4. Occurrence Date: 29 July 1977 and 2 August 1977 (discovered 4 August 1977)

5. Identification of occurrence:

Unplanned radioactive gaa release contrary to Environmental Technical Specification 5.6.2.A.

, 6. Conditions Prior to Occurrenca:

Mode 1 power operation.

7. Description of Occurrenca:

It was discovered on 4 August 1977 that radiation monitor EMA-Z went into high alarm on two occasions. The =1=rms occurred on 29 July and 2 August 1977. The Plant Review i Committee determined that a probable unplanned radioactive gas release had occurred on each date. Upon each occurrence, the high alarm cleared immediately and ventilation to the km414ary Building was resumed. Investigation revealed that on each occasion the icop seal on the waste evaporator had blevn. Because of the brevity of the incident, there were no measurable changes in the release concentration on either occasion.

O Designation of Apparent Cause:

Blown loop seal of the waste evaporator causing a probable radioactive gas release to the Auxiliary Building.

9. Analysis of Occurrence:

The health and safety of the plant and public were not affected, as the releases were of such short durations that they could not be measured.

10. Corrective Action:

The vaste gas system is now being evaluated by Production and Plant Engineering, and corrective action will be implemented upon receipt of recommendations.

11. Failure Data:

This is the fifth occurrence of this event, as reported on LER's77-49E, 77-61E,77-73E, and 77-80E.

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