ML081840358

Technical Specification 3.2, Appendix B, Reporting Related to National Pollutant Discharge Elimination System Permit

ML081840358
Person / Time
Site:	Calvert Cliffs
Issue date:	07/02/2008
From:	Gaines J Constellation Energy Group
To:	Document Control Desk, Office of Nuclear Reactor Regulation
References
Download: ML081840358 (4)

Text

Calvert Cliffs Nuclear Power Plant U. S. Nuclear Regulatory Commission Washington, DC 20555 July 2,2008 1650 Calvert Cliffs Parkway Lusby, Maryland 20657 ATTENTION:

REFERENCE:

Document Control Desk Calvert Cliffs Nuclear Power Plant Unit Nos. 1 & 2; Docket Nos. 50-317 & 50-318 Technical Specification 3.2, Appendix B, Reporting Related to National Pollutant Discharge Elimination System Permit (a)

Calvert Cliffs Nuclear Power Plant, Environmental Protection Plan (Non-Radiological) Technical Specifications, Section 3.2.1 In accordance with Reference (a), Calvert Cliffs Nuclear Power Plant is submitting a Special Report

[Attachment (1)].

The special report is related to the site's National Pollutant Discharge Elimination System permit.

Should you have questions regarding this matter, please contact Mr. Jay S. Gaines at (410) 495-5219.

Very truly yours, J

S. Gaines Director -- Licensing JSG/RDW/bjd

Attachment:

(1)

Special Report: Noncompliance with Effluent Limitations cc:

D. V. Pickett, NRC S. J. Collins, NRC Resident Inspector, NRC S. Gray, DNR

ATTACHMENT (1)

.SPECIAL REPORT: NONCOMPLIANCE WITH EFFLUENT LIMITATIONS Calvert Cliffs Nuclear Power Plant, Inc.

July 2, 2008

Calvert Cliffs Nuclear Power Plant Constellation Ene gy" Nuclear Generation Group June 12, 2008 1650 Calvert Cliffs Parkway Lusby, Maryland 20657 Maryland Department of the Environment Water Management Administration 1800 Washington Boulevard Baltimore, MD 21230 ATTENTION:

REFERENCE:

Mr. Tom Boone Calvert Cliffs Nuclear Power Plant Special Report: Noncompliance with Effluent Limitations (a)

NPDES Discharge Permit 02-DP-0 187 In response to Reference (a), on June 8, 2007, at 10:00 am, Calvert Cliffs Nuclear Power Plant personnel identified that a chemical drum overflowed into its secondary containment, which in turn overflowed into a storm drain. The drum had originally contained 31 gallons of a 35% solution ofhydrazine. The leakage spilled across approximately 30' ofasphalt and entered the storm water system.

Hydrazine is added to the vendor supplied demineralized make-up water system at Calvert Cliffs to remove oxygen. Based on calculations using final hydrazine concentrations in the drum and secondary containment, it is estimated that less than 2 gallons of the 35% hydrazine solution entered the storm water system.

The storm water piping discharges into the non-contact cooling water system leading to the Chesapeake Bay. Thus the leakage was diluted by the cooling water system flow of 2,400,000 gallons per minute prior to entering the Bay.

As a result of the dilution volume, there was no impact to the environment.

Hydrazine also reacts with oxygen in water to form nitrogen and water, therefore the hazard was eliminated during the dilution process.

The cause of the overflow was the failure of a pump and a check valve in the chemical feed line. The duration of the discharge to the storm water system was less than 2 hours2.314815e-5 days <br />5.555556e-4 hours <br />3.306878e-6 weeks <br />7.61e-7 months <br />.

The discharge to the Chesapeake Bay was stopped by isolation ofthe make-up water system which stopped the backflow to the drum.

The hydrazine addition equipment remained out-of-service until the pump and check valves were replaced.

An additional check valve was also installed in the chemical feed line to prevent recurrence.

Each check valve (suction, pump head, and discharge) was independently checked to ensure no system backflow. The system will be monitored around the clock until a large area containment device is placed under all ofthe chemical addition equipment.

There was no accelerated or additional sampling, as the nature and impact of the discharge had been determined.

Mr. Tom Boone June 12,2008 Page 2 Should you have questions regarding this matter, please contact Mr. Jay S. Gaines at (410) 495-52 19 or Ms. Brenda D. Nuse at (410) 495-4913.

Douglas R. Bauder Plant General Manager DRB/SMRJbjd