ML120660093

North Anna Power Station - Unauthorized Discharge Five Day Notification - Vpdes Permit No. VA0052451

ML120660093
Person / Time
Site:	North Anna
Issue date:	02/20/2012
From:	Chutima Taylor Dominion Resources Services
To:	Mark Miller NRC/RGN-II, State of VA, Dept of Environmental Quality
References
Download: ML120660093 (2)

Text

Dominion Resources Services, Inc.

4 5000 Dominion [ionlevard, Glen Allen, VA 23060 OflhIfliOfl

\\cb Add rc: vvew.dotn .coni CERTIFIED MAIL RETURN RECEIPT REQUESTED February 20, 2012 Mr. Mark Miller PREP Coordinator Virginia Department of Environmental Quality Northern Regional Office 13901 Crown Court, Woodbridge, VA 22193 Re: Dominion North Anna Power Station Unauthorized Discharge Five Day Notification VPDES Permit No. VA0052451

Dear Mr. Miller:

This letter is a follow up to the verbal notification made to DEQ by Dominion on Wednesday, February 15, 2012 at approximately 12:42 PM to report an overflow of raw sewage water to a stormwater ditch that discharges to Lake Aima.

On February 14, 2012, at approximately 12:50 PM, North Anna Power Stations chemistry staff was notified of water drainage which appeared to be originating in the vicinity of a manhole cover presumed to be part of the stormwater conveyance, and draining into a nearby stonnwater ditch. This water was believed to be stormwater runoff from the area surrounding the Training Building. The quality of the water appeared clear with no obvious indicators such as odor or solids. At about the same time the flow from the manhole was observed, station staff discovered that a circuit breaker inside the Training Building had been tripped which supplies power to the buildings sewage lift station. The power was restored to the Training Buildings sewage lift station at approximately 2:15 PM and the water levels in the sewage lift station tank returned to normal.

Upon further investigation on February 15, 2012 at approximately 10:30 AM, it was discovered that the design of Training Buildings sewage sump includes a line that leads to the manhole where the water flow was observed. The lift stations high level alarm was never triggered because of the power loss. The high level in the lift station resulted in a backflow to the manhole. It is estimated that approximately 120 to 200 gallons of raw sewage water could have entered the stormwater ditch. The ditch travels approximately 180 feet before entering Lake Anna. Some of the sewage water was absorbed by the ground surrounding the manhole.

However, the total volume of sewage water that reached the stormwater ditch and Lake Anna is not known.

Mr. Miller 2/20/12 Page 2 In the interim, the chemistry staff is inspecting the Training Buildings lift station once per shift to ensure it has power. A condition report (CR) was submitted to document the event.

An evaluation of the design adequacy of the Training Buildings sewage lift station is in progress. Corrective actions will be implemented based on the results of this evaluation.

Should you require additional information, please contact Rick Woolard at (804) 273-2991

• I certify under penalty of law that this document and all attachments were prepared under my direction or supervision in accordance with a system designed to assure that qualified personnel properly gather and evaluate the information submitted. Based on my inquiry of the person or persons who manage the system, or those persons directly responsible for gathering the information, the information submitted is, to the best of my knowledge and belief, true, accurate, and complete. I am aware that there are significant penalties for submitting false information, including the possibility of fine and imprisonment for knowing violations.

Sincerely, I I / J -

--/i Cathy C. Tador Director, Electric Environmental Services Cc: Mrs. Susan D. Mackert Environmental Specialist II Virginia Department of Environmental Quality Northern Regional Office 13901 Crown Court, Woodbridge, VA 22193 United States Nuclear Regulatory Commission Region II Marquis One Tower 245 Peachtree Center Ave., NE, Suite 1200 Atlanta, Georgia 30303-1257 NRC Senior Resident Inspector North Anna Power Station 1022 Haley Drive Mineral, VA 23117