05000302/LER-1979-077-03, /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

/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
Issue date:	09/04/1979
From:	Cooper J FLORIDA POWER CORP.
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II)
Shared Package
ML19253A837	List: 05000302/LER-1979-077, Forwards LER 79-077/03L-0 05000302/LER-1979-077-03, /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
References
LER-79-077-03L, LER-79-77-3L, NUDOCS 7909110510
Download: ML19253A843 (14)

LER-1979-077, /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

Event date:
Report date:
3021979077R03 - NRC Website

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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

[ contrary to Technical Specification 3.4.8.

No safety hazard as Reactor l

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, Coolant System Purification reduced DEI-131 to acceptable levels.

Redundancy,

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[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.

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<51,3 (SEE ATTACHF SUPPLEMENTARY INFOR'4ATION SHEET) 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.

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Reactor Power History of Prior Forty-eight Hours Iten I Event Date:

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7 Fuel Burnup by Core Region Item 2 Event Date:

16 August 1979 (n';

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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 o -

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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

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Degas Operations Item 4 DATE TABLE TIME 8/14/79 Degassed Pressurizer 1600 8/16/79 Reactor Trip 0255 Y

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Time Duration When DEI-131 Exceeded 1.0 u C1/ gram anc I-131 Analysis Results Item 5 Event Date:

16 August 1979 m<-

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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.

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