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Event Notification Report for June 4, 2010

U.S. Nuclear Regulatory Commission
Operations Center

Event Reports For
06/03/2010 - 06/04/2010

** EVENT NUMBERS **

45970

45975

General Information or Other	Event Number: 45970
Rep Org: MISSISSIPPI DIV OF RAD HEALTH Licensee: MISSISSIPPI DEPT. OF TRANSPORTATION Region: 4 City: Southhaven State: MS County: License #: MS-261-01 Agreement: Y Docket: NRC Notified By: DANIEL BRANTLEY HQ OPS Officer: HOWIE CROUCH	Notification Date: 06/01/2010 Notification Time: 17:22 [ET] Event Date: 05/24/2010 Event Time: 02:00 [CDT] Last Update Date: 06/01/2010
Emergency Class: NON EMERGENCY 10 CFR Section: AGREEMENT STATE	Person (Organization): GREG WERNER (R4DO)

Event Text

MISSISSIPPI AGREEMENT STATE REPORT - MOISTURE DENSITY GAUGE SOURCE UNABLE TO BE RETRACTED TO SHIELDED POSITION

The following information was obtained from the State of Mississippi via email:

"On May 24, 2010 around 2:00 a.m. [CDT], a Portable Moisture Density gauge was run over by an asphalt roller. The casing of the gauge was damaged. DRH [Mississippi Division of Radiation Health] was notified and supplied with the following measures of radiation, 22 mR/hr at the surface of the damaged gauge and 0.75 mR/hr at approx. 3 feet from the gauge. DRH [was] informed that the gauge could be safely placed in a sealable carrying case. It was determined that the Cs-137 source was not returning to its fully shielded position. A DRH official went to the site the next morning with a small lead pig. The source holder was extended a few inches in order to tape the pig on the rod's end. The damaged gauge was then taken to MDOT [Mississippi Dept. of Transportation] storage site and a leak test was performed. The wipes were analyzed by the MSDH [Mississippi State Department of Health] Radiological Health Lab. The measured activity was well below the regulatory upper limit of .005 microCuries. Wipe analysis was received 5/26/2010."

Isotope(s): Cs-137, 8 mCi and Am-241:Be, 44 mCi.

Report No: MS-10004

Power Reactor	Event Number: 45975
Facility: MONTICELLO Region: 3 State: MN Unit: [1] [ ] [ ] RX Type: [1] GE-3 NRC Notified By: MICHAEL STIDMAN HQ OPS Officer: BILL HUFFMAN	Notification Date: 06/03/2010 Notification Time: 17:14 [ET] Event Date: 06/03/2010 Event Time: 10:50 [CDT] Last Update Date: 06/03/2010
Emergency Class: NON EMERGENCY 10 CFR Section: 50.72(b)(3)(v)(C) - POT UNCNTRL RAD REL 50.72(b)(3)(v)(D) - ACCIDENT MITIGATION	Person (Organization): PATTY PELKE (R3DO)

Unit	SCRAM Code	RX CRIT	Initial PWR	Initial RX Mode	Current PWR	Current RX Mode
1	N	Y	100	Power Operation	100	Power Operation

Event Text

SECONDARY CONTAINMENT BRIEFLY DEGRADED

"On June 3rd, 2010, at 1050 CST, both doors in Airlock 413 from Secondary Containment (SCT) to the Rad Waste 985' Pump Room were opened simultaneously for approximately five seconds and subsequently re-closed. This condition caused an unplanned entry into Technical Specification 3.6.4.1.A for SCT. The condition could have prevented the Standby Gas Treatment system from developing a negative pressure within SCT following a design basis accident.

"This negative pressure is required to prevent ground level releases of radioactivity and minimize onsite and offsite dose consequences following an accident, The Standby Gas Treatment system remained operable throughout the event. The site continues to assess the situation."

The licensee has notified the NRC Resident Inspector and will also notify State authorities.

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