ML111180442

Special 30-Day Written Radiological Environmental Monitoring Program Report

ML111180442
Person / Time
Site:	San Onofre
Issue date:	04/27/2011
From:	Onge R Southern California Edison Co
To:	Document Control Desk, Office of Nuclear Reactor Regulation
References
Download: ML111180442 (2)

Text

I~I SOUTH"N CALIfORNIA Richard J. St. Onge

~ EDISON Director Nuclear Regulatory Affairs An EDISON INTERNA TIO NAL Company ODCM, Section 5.1.1 Apr; 1 27, 2011 ATTN. Document Control Desk U. S. Nuclear Regulatory Commission Washington, DC 20555-0001

Subject:

Docket Nos. 50-361 and 50-362 Special 30-Day Report Radiological Environmental Monitoring Program San Onofre Nuclear Generating Station (SONGS), Units 2 and 3

Dear Sir or Madam:

Offsite Dose Calculation Manual (ODCM), Section 5.1.1, Action b for San Onofre Units 2/3 Facility Operating License Nos. NPF-10 and NPF-15 requires a 30-day written report if the radioactivity in an environmental sampling medium exceeds the reporting levels of Table 5-2 when averaged over any calendar quarter.

On 3-23-2011 the REMP (Radiological Environmental Monitoring Program) local leafy crop sample collected from the SONGS garden (0.4 mile,Sector R) yielded a quarterly average result greater than the ODCM reporting level. This sample result is one and the same as the quarterly average because this sample was the only local crop indicator sample collected during the first quarter 2011 . No local fleshy sample was available for first quarter 2011 . The control samples for leafy and for fleshy crops (one each) also contained detectable levels of 1-131 in the first quarter 2011 samples.

FIRST QUARTER 2011 REMP LOCAL CROP SAMPLE RESULTS lodine-131 Cesium-134 Cesium-137 (picoCuries/gram) (picoCuries/gram) (picoCuries/gram)

Local crop indicator sample 2.5E-1 2.8E-2 2.9E-2 (sorrel)

Control leafy sample (lettuce) 6.2E-2 <MDC <MDC Control fleshy sample 1.8E-2 <MOe <MDC (strawberry)

ODCM Table 5-2 environmental 1E-1 1 2 reporting threshold for local crops P.O . Box 128 San Clement e, CA 92674

Document Control Desk Apr; 1 27, 2011 Prior REMP sample results have not consistently detected the presence of these isotopes in local crop samples. The quantities of radioactive airborne effluents from San Onofre Units 2 and 3 during 2010 did not increase overall compared to year 2009. Weekly REMP air samples during March 2011 also contained detectable levels of 1-131, Cs-134, and Cs-137. The atypical detection of 1-131 in both indicator and coritrollocal crop samples is credibly attributed to the trans-Pacific transport of airborne releases from Dai-Ichi following the March 11, 2011 .

Tohoku earthquake and is not related to the operations of ~ONGS.

If you have any questions, please contact Mr. Ryan Treadway at (949) 368-9985.

Sincerely, .

cc: E. E. Collins, Regional Administrator, NRC Region IV R. Hall, NRC Project Manager, San Onofre Units 2 and 3 G. G. Warnick, NRC Senior Resident Inspector, San Onofre Units 2 and 3 S. Y. Hsu, California Department of Public Health