05000346/LER-1981-016-03, /03L-0:on 810308,dose Equivalent I-131 Level Exceeded Tech Spec Limit.Caused by Gas Leakage Through Fuel Cladding.Levels Monitored

/03L-0:on 810308,dose Equivalent I-131 Level Exceeded Tech Spec Limit.Caused by Gas Leakage Through Fuel Cladding.Levels Monitored

ML19343D158
Person / Time
Site:	Davis Besse
Issue date:	04/03/1981
From:	Scott R TOLEDO EDISON CO.
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION III)
Shared Package
ML19343D157	List: 05000346/LER-1981-016, Forwards LER 81-016/03L-0 05000346/LER-1981-016-03, /03L-0:on 810308,dose Equivalent I-131 Level Exceeded Tech Spec Limit.Caused by Gas Leakage Through Fuel Cladding.Levels Monitored
References
LER-81-016-03L, LER-81-16-3L, TAC-47043, NUDOCS 8104090637
Download: ML19343D158 (4)

LER-1981-016, /03L-0:on 810308,dose Equivalent I-131 Level Exceeded Tech Spec Limit.Caused by Gas Leakage Through Fuel Cladding.Levels Monitored

Event date:
Report date:
3461981016R03 - NRC Website

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EVm f DESCRIPTION AND PROBASLE CONSEQUENCES h I; ! 21 l (NP-33-81-15) on 3/S/81 at 0830 hours0.00961 days <br />0.231 hours <br />0.00137 weeks <br />3.15815e-4 months <br /> following a power reduction, a Reactor Coolant l lc (3 l l System (RCS) sample revealed that the Dose Equivalent Iodine I-131 level was greater l Wgl than the 1.0 uCi/gn limit of Technical Specification 3.4.8, Table 4.4-4.

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I ; 15 l l hours the level peaked at 1.51 uCi/gm Dose Equivalent Iodine I-131.

At 1500 hours0.0174 days <br />0.417 hours <br />0.00248 weeks <br />5.7075e-4 months <br /> onj j r le ] ] 3/9/81 the level returned to below the limit. There was no danger to the health and j j r. J 7 j i safety of the public or station personnel. The highest level was still well below l

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44 47 CAUSE DESCRIPTION AND CORRECTIVE ACTIONS h li4all The cause was a slight leakage of gas through the fuel cladding. Some leakage is further com-r normal following a power reduction when the cases in the fuel rods are ggl The levels were monitored to ensure that it g

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TOLEDO EETSON COM'AW DAVIS-BESSE NUCLEAR POUER STATION UNIT ONE SUPPLEME!T/AL INFORMATION FOR LER NP-33-81-15 DATE OF EVENT: March 8, 1981 FACILITY: Davis-Ee se Unit 1 IDENTIFICATION OF OCCURRENCE: Reactor Coolant System (RCS) Dose E uivalete I-131 3

Exceeded Technical Specification Limits After a Power Reduction The unit was in Mode 1 with Power (IMT) = 195 Conditions Prior to Occurrence:

and Load (Cross tf4E) = G.

Description of Occurrence: At 0830 hours0.00961 days <br />0.231 hours <br />0.00137 weeks <br />3.15815e-4 months <br /> on March 8, 1981 following a power reduction an RCS sample was collected in accordance with Technical Specification 3.4.S, Tabic 4.4-4.

The analysis of the sample by Chemistry and Health Physics personnel showed that the radio-iodine content excee led the Technical Specification 3.4.8 limit of 1.0 uCi/ gram Dose Equivalent of I-l31.

At 1501 hours0.0174 days <br />0.417 hours <br />0.00248 weeks <br />5.711305e-4 months <br /> on March 9,1981, the level peaked at 1.31 uCi/gm Dose Equivalent Iodine I-131.

The following information is supplied per reporting requirements:

Syecific Activity Analysis:

Date Time Activity (uC1/P) 3/7/81 0810 0.075 3/8/81 0830 1.25 1220 1.30 1501 1.51 1821 1.34 2200 1.35 3/9/81 0200 1.15 0600 1.13 0815 1.00 1200 1.04 1500 0.77 Power History:

Reactor power was constant at approximately 99.6% until 2300 hours0.0266 days <br />0.639 hours <br />0.0038 weeks <br />8.7515e-4 months <br /> on March 7, 1981.

Date Time Reactor Power 3/7/81 2300 93.58%

3/8/81 0000 82.98%

0100 75.94%

0200 62.12%

0300 46.80%

0400 34.71%

0500 26.62%

LER #81-016 i

TOLEDO EDISON COMPANY DAVIS-BESSE NUCLEAR POWER 5TATION UNIT ONE SUPPLEMENTAL INFORMATION FJR LER NP-33-81-15 PACE 2 Date Time Reactor Power 3/8/81 0600 21.77%

0700 11.93%

0800 8.52%

0830 7.5%

Fuel Burnup By Core Region - See attached computer printout Cleanup Flow History - 48 hours5.555556e-4 days <br />0.0133 hours <br />7.936508e-5 weeks <br />1.8264e-5 months <br /> prior to the first limit exceeding sample:

The letdown flow during this time period was kept constant at approximately 79.5 gpm.

There was no degassing operation.

The Dose Equivalent I-131 exceeded 1.0 uC1/gm at 0830 hours0.00961 days <br />0.231 hours <br />0.00137 weeks <br />3.15815e-4 months <br /> on March 8, 1981, and was below that limit at 1500 hours0.0174 days <br />0.417 hours <br />0.00248 weeks <br />5.7075e-4 months <br /> on !! arch 9,1981. The total time dura-tion was 30 hours3.472222e-4 days <br />0.00833 hours <br />4.960317e-5 weeks <br />1.1415e-5 months <br /> and 30 minutes. The maximum measured level was 1.51 uCi/gm Dose Equivalent I-131.

Designation of Apparent Cause of Occurrence: The cause of the 1.51 uCi/gm Dose Equi-valent I-131 level in the RCS was a slight amount of leakage of gas through the fuel rod cladding. Some leakage is normal following a power transient when the gases in the fuel rods are further compressed by the contracting cladding. Any small defects would allow some gas to escape.

Analysis of occurrence:

There was no danger to the health and safety of the public or to statien personnel. There was nu venting of containment gases until the levels had decayed. The highest levels found in any sample was still well below the allowa-ble limit of 60 uCi/gm per Figure 3.4-1 of Technical Specification 3.4.8.

Corrective Action

The action that was taken was to monitor the level of I-131 to ensure that it did return to below the Technical Specit'ication limit of 1 uC;'gm.

At 1500 hours0.0174 days <br />0.417 hours <br />0.00248 weeks <br />5.7075e-4 months <br /> on March 9, 1981, the level dropped to 0.77 uCi/gm.

Failure Data: There has been one previous report of high iodine levels on December 3,1980, see Licensee Event Report NP-33-80-114 (80-088).

LER #81-016

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