ML102030462

Groundwater Protection Status

ML102030462
Person / Time
Site:	Brunswick
Issue date:	07/20/2010
From:	Progress Energy Carolinas
To:	Office of Information Services
References
FOIA/PA-2010-0209
Download: ML102030462 (29)

Text

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§ Storm Drain Stabilization Pond (SDSP) o Discharges to Nancy's Creek SDSP Atmospheric Releases due to Evaporation Protected Area

• Owner Controlled Area Progress Energy

Cr 1977 - SDSP constructed from a spoil pond provide Brunswick Nuclear Plant (BNP) with the capability to meet EPA effluent storm water release standards 1983 - Issuance of RETS. Stabilization Pond identified as a liquid effluent release point.

o 1992 - The licensee identified the Stabilization Pond as a previously unrecognized release point for tritium.

• I Progress Energy

• 2006 - BNP began to analyze water in manholes for tritium and gamma emitters

• 2007 - Tritium was discovered in manholes in vicinity of Storm Drain Stabilization Pond

• Values were 75,000 pCi/I to 150,000 pCi/I

• 2007 Standing/Flowing water containing tritium was found on the areas outside of the SDSP dike some of which was flowing toward intake canal.

Values were 47,000 pCi/I to 880,000 pCi/I

• Progress Energy

WP-24<LLD 36,050 281,600 197,400 604,500 391,200

< LLD (Well) 60 93,410 166,800

< LLD (well) 180,400 804,100

<LL 793,600 882,400 342,400

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• Weekly- SDSP samples analyzed for tritium

• Monthly - Curies evaporated from SDSP calculated

• 21.80 Curies in 2008

• Annually - Dose to nearest member of the public (0.3 miles NW) in 2008

• 0.00667 mrem via inhalation

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Average Activity Number Activity Number Range (pCi/L) (pCi/L)

MWPA-100C 356 MWPA-1 12C 10,500 MWPA-101C 3,390 MWPA-113C 405 MWPA-102C 5,040 MWPA-1 14C 597 MWPA-103C Non-detectable MWPA-1 15C 27,200 MWPA-104C 23,100 MWPA-1 16C Non-detectable MWPA-105C 3,320 MWPA-1 17C 4,450 MWPA-106C 535 MWPA-1 18C 546 MWPA-107C 3,030 MWPA-1 04B 27,300 MWPA-108C 353 MWPA-107B 44,700 MWPA-109C 435 MWPA-1 IIB 2,850 MWPA-110C, 373 MWPA-118B Non-detectable MWPA-111C 29,300

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• Continuing to monitor wells around SDSP

• Preparing to begin startup of extraction wells

• Continuing to monitor offsite surface water and assign dose accordingly o Continuing to monitor dose from airborne releases

• Continuing to monitor wells in OCA and PA

• Progress Energy

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