ML19253A843

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LER 79-077/03L-0:on 790816,after Reactor Trip,Sampling Revealed Reactor Coolant Dose Equivalent I-131 Exceeded One Uci/G. Caused by Expected Spike & Leaking Fuel Pins. No Corrective Action Taken
ML19253A843
Person / Time
Site: Crystal River Duke Energy icon.png
Issue date: 09/04/1979
From: Cooper J
FLORIDA POWER CORP.
To:
NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II)
Shared Package
ML19253A837 List:
References
LER-79-077-03L, LER-79-77-3L, NUDOCS 7909110510
Download: ML19253A843 (14)
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Text

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CC*.T o i [ @ @l0f 510t -1 0 i 3r0 t 2 g O! 8J 1 l 6 f 7f 9 Q[ 0! 91. .01417 ., .. , ....... l 9 l@.. , . . .. m......... . . . . . . . . avENT OtsCAirT&ON AfeQ #aOg Ag([ coae 5(OLENC(3 g l At 0509 following a Reactor trip, Chem / Rad sampling revealed that the g reactor coolant Dose Equivalent I-131 exceeded 1.0 microcurie per gram , o , [ contrary to Technical Specification 3.4.8. No safety hazard as Reactor l o , , Coolant System Purification reduced DEI-131 to acceptable levels. Redundancy , [7pq t .n The DEI-131 was .7437 microc.iries per'eram at 0500 on 18 August 1979.  ; y ; This is the twelfth occurrence reported under this Technical Specification. g I L,2,1_,j e, i *a svirtu eaasi  : . .s e co . u,.. coon coce sa::: co >>cs c .? ::st so ::: s.,:::: al+ lC lGl g ] g l Zlu @ J ZI a Zi Zl Z( Z ;g []], Q, g 

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    ,  e l rhis event was caused b, an expected spi'xe following a Reactor trip and known; leaking fuel pins.                                   No c-        &ctive action necessary.as the Reactor Coolant                                                                     ,

System Purification returned the DEI-131 to within acceptable limits. , iei l  ! 

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(SEE ATTACHF SUPPLEMENTARY INFOR'4ATION SHEET) * <51,3 79001105/O s

Supplementary Information Report No.- 50-302 / 077-03 L-0 Facility: Crystal River Unit #3 Report Date: 4 September 1979 Occurrence Date: 16 August 1979 Identification of Occurrence: The Dose Equivalent 1-131 was greater than 1.0 microcurie per gram of primary coolant contrary to Technical Speci-fication 3.4.8. Conditions Prior to Occurrence: Mode 3 hot standby. Description of Occurrence: At 0509, following a Reactor trip, Chem / Rad sampling revealed that the Dose Equivalent I-131 exceeded 1.0 microcurie per gram of primary coolant. Dose Equivalent I-131 was 2.059 microcuries per gram. Action statement of 3.4.8 was entered and the four hour sampling frequency was initiated. The Dose Equivalent I-131 returned to within acceptable limits at 0500 on 18 August 1979. Designation of Apparent Cause: This event was due to an expected transien; spike follow-ing a Reactor trip and known leaking fuel pins. Analysis of Occurrence: There was no safety hazard to the plant or general public as sampling demenstrated reducing levels of DEI-131. The transient was within the capabilities of the plant puri-fication system. Corrective Action: No corrective action deemed necessary as Reactor Coolant purification returned the DEI-131 to within acceptable limits. Failure Data: This is the twelfth occurrence reported under this Technical Specification. /rc gg. . 94 JaiG.LY-

Reactor Power History of Prior Forty-eight Hours Iten I Event Date: 16 Au.ust 1979 o>s33, 63 tb 0' %>it b, 

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7 Fuel Burnup by Core Region Item 2 Event Date: 16 August 1979 (n'; 9 , r3 els) i d :sj

Item 2 The burnup was calculated at 11.7 EFPD for the three (3) enrich:nent regions. REGION NUMBER of FA BURNUP A MWD /MTU B 61 13,568 MWD /MTU C 60 10,517 MWD /MTU D 56 297 MWD /MTU Ave. 9024 MWD /MTU 337320

Clean-up Flow History Iteet 3 Event Date: 16 August 1979 

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Item 3 Clean-up history starting fortv-eight (48) hours prior to the first sample in which the limit was exceeded is as follows: DATE TIME LETDOW'1 FLOW 8/14/79 0212 61 gpm 8/15/79 0100 68 gpm 8/16/79 0130 60 gpm e> - . . . , 

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History of Degassing Operations for This Report Item 4 Event Date: 16 August 1979 ( . p > q 

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Degas Operations Item 4 DATE TABLE TIME 8/14/79 Degassed Pressurizer 1600 8/16/79 Reactor Trip 0255 Y s~ o <ri &.. au 4.g

Time Duration When DEI-131 Exceeded 1.0 u C1/ gram anc I-131 Analysis Results Item 5 Event Date: 16 August 1979 m<- I Jg_e,' 

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Item 5 As per Technical Specification 3.4.8 The four (4) hour sampling frequency was initiated at 0509 on 16 August 1979 and the Dose Equivalent I-131 was 2.059 microcuries per gram. The four (4) hour samnling frequency was terminated at 1415, on 18 August 1979 when the DEI-131 was determined to be .3685 microcuries per gram. DEI-131 was 5 1 a Ci/ gram at 0500 cn 18 August 1979 when the sample results were .7437 uci/ gram. O m , - 3. , _ 

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