05000336/LER-1982-028, Forwards LER 82-028/03L-0.Detailed Event Analysis Encl

Forwards LER 82-028/03L-0.Detailed Event Analysis Encl

ML20062D744
Person / Time
Site:	Millstone
Issue date:	07/30/1982
From:	Mroczka E NORTHEAST NUCLEAR ENERGY CO., NORTHEAST UTILITIES
To:	Haynes R NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION I)
Shared Package
ML20062D745	List: 05000336/LER-1982-028, Forwards LER 82-028/03L-0.Detailed Event Analysis Encl 05000336/LER-1982-028-03, /03L-0:on 820712,surveillance Testing Indicated I-131 Concentration Higher than Allowed by Tech Spec.Caused by Defective Fuel Pins.Power Increases Will Be Limited to Prevent Addl Fuel Defects
References
MP-2-5258, NUDOCS 8208060206
Download: ML20062D744 (3)

LER-1982-028, Forwards LER 82-028/03L-0.Detailed Event Analysis Encl

Event date:
Report date:
3361982028R00 - NRC Website

text

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July 30, 1982 MP-2-5258 Mr. Ronald C. Haynes Regional Administrator, Region I Office of Inspection and Enforcement U. S. Nuclear Regulatory Commission 631 Park Avenue King of Prussia, Pennsylvania 19406

Reference:

Facility Operating License No. DPR-65 Docket No. 50-336 Reportable Occurrence R0-50-336/82-28/03L-0

Dear Mr. Haynes:

This letter forwards Licensee Event Report 82-28/03L-0 required to be submitted within thirty days pursuant to Millstone Unit 2 Appendix A Technical Specifications, Section 6.9.1.9.b, conditions leading to operation in a degraded mode permitted by a limiting condition for operation. An additional three copies of the report are enclosed.

Yours truly, NORTHEAST NUCLEAR ENERGY COMPANY f4 (A

. J. Mroczk' Station Superintendent Millstone Nuclear Power Station EJM/RB:mo

Attachment:

LER R0-82-28/03L-0 cc: Director, Office of Inspection and Enforcement, Washington, D.C. (30)

Director, Office of Management Information and Program Control, Washington, D. C. (3)

U.S. Nuclear Regulatory Commission, c/o Document Management Branch, Washington, D.C. 20555 8208060206 820730 PDR ADOCK 05000336 S

PDR flW

r-ATTACitiENT TO LER 82-28/03L-0 NORTHEAST NUCLEAR ENERGY COMPANY MILLSTONE NUCLEAR POWER STATION-UNIT 2 FACILITY OPERATING LICENSE NUMBER DPR-65 DOCKET N0. 50-336 Event Description and Probable Consequences While in a hot standby condition caused by a full power trip on 12 July 1982, surveillance testing indicated an activity in the primary coolant of greater than 1.0 microcuries per gram D.E. 1-131.

For 16 hours1.851852e-4 days <br />0.00444 hours <br />2.645503e-5 weeks <br />6.088e-6 months <br /> the activity was above 1.0 microcuries per gram D.E. I-131, and has since decreased to less than 0.1 microcuries per gram D.E. I-131.

This higher than normal activity in the coolant indicates probable fuel defects.

Millstone 2 restarted from a refueling outage in March 1982.

See LER 82-19/99X-0 for further discussion of fuel defects at Millstone 2.

1.

Reactor power history 48 hours5.555556e-4 days <br />0.0133 hours <br />7.936508e-5 weeks <br />1.8264e-5 months <br /> prior to event:

Millstone 2 was operating at 100% power until 0500, 12 July 1982, when it underwent a full power trip due to a turbine trip, caused by turbine thrust bearing surveillance.

2.

Fuel burnup by core region:

The Millstone 2 core consists of 3 regions and a center assembly. The most burned region, consisting of Combustion Engineering manufactured fuel, had a burnup of 26650 MWD /MTU.

The next region, consisting of the leading Westinghouse manufactured fuel, had a burnup of 14310 MWD /MTU.

The new fuel, also manufactured by Westinghouse, had a burnup of 3080 MWD /MTU.

The center assembly consisting of a single re-insert assembly was manufactured by Combustion Engineering and had a burnup of 20500 MWD /MTU.

3.

Coolant purification flow was approximately 80 gpm durtng the 48 hours5.555556e-4 days <br />0.0133 hours <br />7.936508e-5 weeks <br />1.8264e-5 months <br /> pre-ceeding the event.

4.

There was no prior history of degassing operations in the period preceeding the event.

5.

The duration that the primary coolant exceeded 1.0 microcuries per gram Dose Equivalent Iodine 131 was approximately 16 hours1.851852e-4 days <br />0.00444 hours <br />2.645503e-5 weeks <br />6.088e-6 months <br /> on 12 July 1982.

2

PAGE 2 ATTACHMENT TO LER 62-28/03L-0 NORTiiEAST NUCLEAR ENERGY COMPANY MILLSTONE NUCLEAR POWER STATION-UNIT 2 FACILITY OPERATING LICENSE NUMBER DPR-65 DOCKET N0. 50-336 Time /Date of Sample Microcuries per gram D.E. I-131 0520/12 July 1982 0.801 0620/

1.020 0730/

1.362 0830/

1.953 0930/

1.707 1030/

1.797 1130/

1.711 1230/

1.692 1330/

2.014 1430/

1.546 1520/

1.428 1630/

1.403 1830/

1.248 2230/

0.989 0230/13 July 1982 0.793