Morning Report for November 1, 2001
Headquarters Daily Report NOVEMBER 01, 2001 *************************************************************************** REPORT NEGATIVE NO INPUT ATTACHED INPUT RECEIVED RECEIVED HEADQUARTERS X REGION I X REGION II X REGION III X REGION IV X PRIORITY ATTENTION REQUIRED MORNING REPORT - REGION II NOV. 01, 2001 Licensee/Facility: Notification: Tennessee Valley Authority MR Number: 2-01-0019 Sequoyah 1 2 Date: 11/01/01 Soddy-Daisy,Tennessee Dockets: 50-327,50-328 PWR/W-4-LP,PWR/W-4-LP Subject: UNPLANNED RADIOLOGICAL RELEASE Discussion: At 6:40 a.m., on October 30, 2001, as water was being released from the turbine building sump to the yard drainage pond, the count rate as measured by the station sump discharge radiation monitor reached its alarm setpoint of 600 CPM. An initial air radiation survey of the sump indicated that there was no abnormal activity. A subsequent water sample from the sump confirmed that there was activity in the turbine building sump. At 8:10 a.m., the release was terminated by re-aligning the sump discharge to the low volume waste treatment pond, which is isolated from the environment. At 8:50 a.m., a Notification of Unusual Event (NOUE) was declared due to an unplanned radiological release which exceeded procedure-prescribed effluent radiation levels. The NOUE was terminated at 9:10 a.m., and a 10 CFR 50.72 notification was made at 9:30 a.m. Liquid samples taken by the licensee at the discharge of the yard drainage pond to the dilution pond and at the discharge of the dilution pond to the Tennessee River detected no activity. Subsequent analysis showed that the total activity in the turbine building sump was actually less than 35% of the Off-site Dose Calculation Manual (ODCM) limit, indicating that the procedure-prescribed radiation limits for declaring an NOUE may have been conservative. No release limits were exceeded and, therefore, the NOUE criteria of two times the ODCM limits did not exist. On October 31, the licensee withdrew the 10 CFR 50.72 notification. The licensee is continuing to investigate the source of the activity in the Turbine Building Sump. The resident inspectors and a Region II radiation protection specialist continue to review the event and monitor the licensee's actions. Regional Action: None. Contact: Paul E. Fredrickson (404)562-4530 _
Page Last Reviewed/Updated Wednesday, March 24, 2021
Page Last Reviewed/Updated Wednesday, March 24, 2021