05000302/LER-1981-010-03, /03L-0:on 810217,after Routine Shutdown,Rcs Sampling Revealed That Dose Equivalent I-131 Exceeded Tech Specs.Caused by Leaking Fuel & Anticipated Dose Equivalent Iodine Transient.Purification Flow Increased

/03L-0:on 810217,after Routine Shutdown,Rcs Sampling Revealed That Dose Equivalent I-131 Exceeded Tech Specs.Caused by Leaking Fuel & Anticipated Dose Equivalent Iodine Transient.Purification Flow Increased

ML19347D365
Person / Time
Site:	Crystal River
Issue date:	03/13/1981
From:	Hernandez V FLORIDA POWER CORP.
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II)
Shared Package
ML19347D363	List: 05000302/LER-1981-010, Forwards LER 81-010/03L-0 05000302/LER-1981-010-03, /03L-0:on 810217,after Routine Shutdown,Rcs Sampling Revealed That Dose Equivalent I-131 Exceeded Tech Specs.Caused by Leaking Fuel & Anticipated Dose Equivalent Iodine Transient.Purification Flow Increased
References
LER-81-010-03L, LER-81-10-3L, NUDOCS 8103170486
Download: ML19347D365 (14)

LER-1981-010, /03L-0:on 810217,after Routine Shutdown,Rcs Sampling Revealed That Dose Equivalent I-131 Exceeded Tech Specs.Caused by Leaking Fuel & Anticipated Dose Equivalent Iodine Transient.Purification Flow Increased

Event date:
Report date:
3021981010R03 - NRC Website

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r go,:j ; At 1515 after routine shutdown it was discovered by Reactor Coolant System sampling that the Dose Equivalent I-131 exceeded 1.0 microcuries per gram. This created toe ) I an event contrary to T. S. 3.4.8.

Redundancy NA. There was no effect upon the This is the twentieth event reported

,,,,), health or safety of the general public go,.j t under this Specification.

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SUPPLEMENTARY INFORMATION Report No.:

50-302/81-010/03L-0 Facility:

Crystal River Unit 3 Report Date:

March 13, 1981 Occurrence Date:

February 17, 1981 Identification of Occurrence:

Primary Coolant Dose Equivalent I-131 was greater than 1.0 microcuries per gram contrary to Technical Specification 3.4.8.

Conditions Prior to Occurrence:

Mode 3 (Hot Standby, 0%)

Description of Occurrence:

At 1515 after routine shutdown, it was discovered that Dose Equivalent I-131 exceeded 1.0 microcuries per gram. This determination was made by analysis of a Reactor Coolant sample drawn at 1315.

Designation of Apparent Cause:

The cause of this event is attributed to leaking fuel or

" Tramp Uranium" (i.e., uranium in the cladding within one recoil radius of the surface) and an anticipated Dose Equiva-lent Iodine transient following a Reactor Coolant System transient.

Analysis of Occurrence:

There was no effect upon the health or safety of the general public.

Corrective Action

The Reactor Coolant System flowrate through the Makeup and Purification System was increased. Dose Equivalent I-131 was determined to be less than 1.0 microcuries per gram at 1400 on February 18, 1981.

Failure Data:

This is the twentieth event reported under this Specification.

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REACTOR POWER HISTORY OF PRIOR FORTY-EIGHT (48) HOURS ITEM I Event Date:

February 17, 1981

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FUEL BURNUP BY CORE REGION ITEM 2 Event Date:

February 17, 1981

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ITEM 2:

The burnup was calculated at 168.457 EFPD for the four (4) 1 enrichment regions.

I REGION NUMBER of FA BURNUP B

9 22,785 MWD /MTU C

60 20,713 MWD /MTU D

52 10,429 MWD /MTU E

56 4,295 MWD /MTU t

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12,602.7 MWD /MTU I

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CLEANUP FLOW HISTORY ITEM 3:

Event Date:

February 17, 1981 i

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ITEM 3:

"B" Demineralizer 59 GPM on Feb. 15; 16; and 17th.

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DEGAS OPERATIONS ITEM 4:

Event Date:

February 17, 1981 l

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DEGAS OPERATIONS ITEM 4:

Event Date:

February 17, 1981 1755 started spraying pressurizer 2/14/81 0630 stopped spraying pressurizer 2/15/81 2020 started spraying pressurizer 2/15/81 1023 stopped spraying pressurizer 2/16/81 1755 started spraying pressurizer 2/16/81 commenced venting MUT and PZR 2/16/81 2230 termincted venting MUT andPZR 2/17/81 0510

TIME DORATION WHEN DEI-131 EXCEEDED 1.0 uCI/ml and I-131 ANALYSIS RE ITEM 5:

Event Date:

February 17, 1981 n

G ITEM 5:

As per Technical Specification 3.4.8, the four (4) hour sampling frequency as 17, 1981 and the depicted on the Table below was initiated at 1315 on fecruary The four (4) hour sampling c

Dose Equivalent I-131 was 1.77 microcuries per ml.

18, 1981 when the DEI-131 was deter-period was terminated at 1215 on February mined to be 0.674 microcuries per ml. The time duration when the specific activity of primary coolant exceeded 1.0 microcuries per ml Dose Equivalent Iodine was twenty (20) hours.

TIME DEI-131 (wCI/ml)

DATE 1.77 1315 2/17/81 1.96 1715 2/17/81 1.51 2115 2/17/81 1.17 0115 2/18/81 1.04 0415 2/18/81 0.858 0858 2/18/81 0.674 1215 2/18/81 4

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