ML20028H723

NPDES Noncompliance Notification:On 901108,water Containing Hydrazine Released to Floor Drain Discharging Into Station Wastewater Collection Basin.Problem Investigation/Station Problem Repts Initiated to Reroute Floor Drains

ML20028H723
Person / Time
Site:	Mcguire, McGuire
Issue date:	01/23/1991
From:	Griggs M DUKE POWER CO.
To:	Gleason R NORTH CAROLINA, STATE OF
References
NUDOCS 9101290230
Download: ML20028H723 (3)

Text

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l Duke Ibar Company  :(104)373 1011 '

, Nuclear Production Department PO Bu 1007

• Charlotte, NC252011007 s

DUKEPOWER January 23, 1991 i

Rex Gleason North Carolina Division of Environmental Management '

919 North Main Street Mooresville, NC. 28115

Subject:

McGuire Nuclear Station Release of Hydrazine via Outfall 005 File: MN-706.26 On November 8, 1990, McGuire Nuclear Station, N9 DES permit

1. NC0024392, released wastewater containing low concentrations of-hydrazine through NPDES outfall 005. The discharge of hydrazine via this outfall was considered an unauthorized release since this activity had not been identified in the NPDES permitting process.

Upon discovery of the release, your. ~ office was notified immediately. As was agreed in that telephone conversation,_we are providing you a written summaty of the event. 1 Event On November 8, 1990, both nuclear units at McGuire, Nuclear Station were shut down. This necessitated operating the station's auxiliary electric boiler in order to produce steam normally provided by one of the operational nuclear units.

During the operation ,of this boi-ler, water containing' hydrazine was released to a . floor drain 1 which discharged to- the station's wastewater collection basin (WWCB). This event resulted in the discharge of low levels of hydrazine.through NPDES outfall 005.

Records indicate that this' boiler water was released into the WWCB for a period of three hours (2:00 p.m. - 5:00 p.m., 11/8/90).. Upon discovery of _this unauthorized discharge, the source of -the release was-immediately terminated.

H Sampling In order to quantify the amount of hydrazine discharged through -the I

Wastewater Collection Basin, the_following samples _were taken:- l 9101290M O 910123 'f /

j PDR ADDCK 05000369 (g fp .i S PDR

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Discharge-Concentration Date Time (outfall 005) Comments 11/8/90 1700' -]

<5 ppb -Release into WWCB discovered, '

less than detectable 11/9/90 0815 <5 ppb *1ess than detectable-11/10/90 1025 255 ppb-11/11/90 0945 -175 ppb-11/12/90 0830- <5 ppb -less than detectable--

11/13/90 0825 <5 ppb -less than detectable 11/14/90 0855- o<5 ppb -less than. detectable The boiler water- containing hydrazine_-resulte~d- in very- low concentrations of hydrazine discharged to waters of the state via  ;

outfal1~005. By comparison, NPDES outfall 002 discharges into i receiving _ waters at the same location as outfall- 005 and is permitted to- discharge hydrazine at a daily maximum concentrations-of up to 4.4 mg/1, Corrective Action As a- result of _ this event, several items were identifie'd to correct the problem-and minimize the possibility of a reoccurrence.

(1) Maintenance was performed on the valves originally found-to be leaking-auxiliary boiler water.

.(2) A Problem Investigation Report (PIR) was initiated'to I evaluate the root: cause(s) of the ' event.

(3) 'A Station Problem Report (SPR) was> initiated to evaluate alternatives for rerouting the floor drains in-the auxiliary boiler room to a more-appropriate: wastewater treatment system, i= PIR's and SPR's are just two of the administrative-controlsLDuke-Power has in place to properly evaluate leventsesuch as this one.

These controls' result in~the review ofrexisting" station practices whi-le at the.same time focusing on: eliminating any reoccurrence of a similar type.

Impact-to the Environment Due to the low. concentrations of hydrazine that were discharged, no observable impact to the receiving waters resulted from the event.

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Additional Notifications I i

Since this discharge was not a federally permitted release, and it was conservatively determined that. hydrazine' could have been released in greater than the reportable quantity _ . in a 24 hour2.777778e-4 days <br />0.00667 hours <br />3.968254e-5 weeks <br />9.132e-6 months <br /> period, the decision was made to treat the event as-reportable under CERCLA / SARA. As a result, additional regulatory agencies were notified of the event on~ November 15, 1990.

Should-you have any questions-regarding-this1 document,-or if you; would like additional information, please feel _ free to-contact me:

at (704) 373-7080.;

John S. Carter, Technical System Manager Nuclear Environmental Comp 1 lance

./ Ne, '

Mi chell Griggs,PSupervising-Sc'lentist

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Nuclear Environmental Compliance MC/1346 xc: NRCsDocument Control 1Deski

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