ML20069A356

RO 83-016:on 830207,contaminated Water from Drain & Refill of 2/3A Heating Boiler Inadvertently Released to Storm Sewer Sys.Caused by Operator Not Realizing Floor Drain Led to Storm Sewer Sys,Not Radwaste Sys.Tech Specs Not Violated

ML20069A356
Person / Time
Site:	Dresden
Issue date:	03/09/1983
From:	Gilman T, Schroeder B, Schroeder C, Scott D COMMONWEALTH EDISON CO.
To:	James Keppler NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION III)
References
RO-82-16, RO-83-016, RO-83-16, NUDOCS 8303150611
Download: ML20069A356 (3)

Text

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.f'N Commonwealth Edison

) Dresden Nucleir Power Stati:n C

R.R. #1 cm Morris, Illinois 60450

%f Telephone sis /942-2920 March 9, 1983 DJS Ltr. #83-255 i

James G. Keppler, Reg,ional Administrator i

Region III U.S. Nuclear Regulatory Commission 799 Roosevelt Road Glen Ellyn, Illinois 60137 A copy of Deviation Report #12-2/3-83-16 is being submitted to your office in accordance with 10 CFR 20.405 to report occurrences where levels of radiation or concentrations of rad *oactive material in an unrcutricted area exceed any applicable limit set forth in 10 CFR 20.405 ot in the license. This report describes the event and corrective actions being taken to prevent recurrence.

D. J. Scott Station Superintendent Dresden Nuclear Power Station DJS/nh Enclosure cc/ Director of Inspection & Enforcement File /NRC

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File /B. Schroeder MAR 101983 8303150611 830309 gDRADOCK 05000237 h

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S U PP LEMENTA L DVR l D ! - I 1 ! 2 l - 12$l ~ l - l 8131 -l 11 61 (PLEASE PRINT OR TYPE ALL REQUIRED INFORMATioN) f o lil l I l L l Dl RI Sl2 l@lOlOl-lOlOlOlOlOl-lOlOl@lXIXIXlXIXl@lXIXl@

7 8 9 UCENSEE CODE 14 15 LICENSE NUMBER 25 26 LICENSE TYPE JQ 57 CAT sa CON'T lotil

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80 81 DOCKET NUMeER es 80 EVENT OATE 74 75 REPORT DATE 80 EVENT DESCRIPTION ANG PRO 8ABLE CONSEQUENCES O'o io!a, puring a drain and refill of the 2/3A heating boiler to reduce the level of radioac-l

[ o i 31 Itive contamination that had concentrated in the A heating boiler, the contaminated l

Io i4i Facer was inadvertently discharged to the storm sewer system. Administrative limit I

f l o f s l i or radioacit ie contamination in heating boilers is 10,000 pci/1. The contamination I 4

l o is I llevel at the time of draining was 4.6 X 10 pei/1. During the heating boiler flush. I l o l 7 I kpproximately 700 gallons of water was drained to a floor drain which drains to a i

I o Ia l Ist rm sewer which in tu'rn, dr'ains to the river discharge canal. The discharge canal i SoTE toe suTCEE COMPONENT CQCE SUB QE QE lo191 l XI Xl@ @@ l Bl@ l Xl Xl XI XI XI Xl@ W@ J@

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9 10 11 12 13 18 19 20 SEQUENTIAL OCCURRENCE REPORT REV'880N DVR EVENT YEAR REPCRT NC.

CODE TYPE N Q.

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3 37 40 48 42 43 44 47 CAUSE OESCRIPTION AND CORRECTIVE ACTIONS 27 l i l o I l The operator who was draining the 2/3A heating boiler did not realize that the floor l

drain being used did not go to the Radwaste system. The floor drain valves have l

been locked and closed to prevent inadvertent use. New procedures for draining and l l blowing down clean and radioactively contaminated heating boilers have been written l g land approved. (DOP 5700-8 and DOP 5700-9).

In addition, operations personnel will I

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%*CwtR oTutm status MY DISCOVERY DESCRIPTION L_15J l HJ@ l0 l 0 l 0 l@l N/A l

lBl@l Operator Observation l

A TlvlTV C TENT ITTs 1 W @D QP RELEASEL.P_J@l.12 millicuries l

l Storm sewers / canal / lake l

RELEASE AMouNTCP ACTIVITY LOCAT10N OP RELEASE l,

PER5oNNEL EXPOS ES l'

NUwsER TYPE DESCRIPTION l

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PER5oNNEL INJu'RtES NUMeER DESCRIPTION li is i I 0101 O l@l N/A l

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OF OR OAu G 70 PACILITY l i 191 [ Z.j@l N/A l

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3 1 10 68 NAME OF PREPARER PHONE:

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Event Description and Probable Consequences (con't) samples for that period of time were LLD. Therefore, the station's Tech. Spec.

of 100 pei/1 in the discharge canal was not exceeded and all discharges to the river were below 10CFR 20 Appendix B limits for general public. Unit operation was not affected by this occurrence. There was no effect on the public health and safety.

Similar previous occurrences were reported by Deviation Reports D-12-2-80-39 and D-12-2-76-91.

Cause Description and Corrective Actions (con't) be trained on the new procedures and this incident during the next six week operator training session starting on March 21, 1983.

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DEVIAT10ll REPORT O Eh DVR NO.

12 2/3 83 16 STA UNIT YEAR NO.

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TITLE Cr DEvlATICN 2/3A Hasting Boiler Contamina-OCCux Eo ard tion and Unplanned Discharge of Boiler Blowdown y

1200 n,y, r,y, sYSTDI AFFECTED 5700 PLANT STATUS AT TIME OF EVENT TESTING Hasting Boiler unog D2 Refuel, P,Rtic,73 0

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. LOAo(MwE) 0 M U T dSi[lN" shift at 0200 hours0.00231 days <br />0.0556 hours <br />3.306878e-4 weeks <br />7.61e-5 months <br />. the Radwaste Foreman and max reevele operator on duty parformed the 2/3 "A" heating boiler blowdown as prescribed in the weekend orders.

The oparator, under direction of the Radwaste Foreman, opened the blowdown valve from the mud drum of 2/3 "A" boiler to the boiler house floor drain system. The foreman and operator vera under the assumption that the floor drains were routed to the *2/3 Radwaste Floor Drain collector. This valve is out of service to prevent blowdown of the boilers to the storm scvar when the boiler water is contaminated.

10 CFRs0.72 NRC RED PHONE 3

O 1300 hr.

(mpy NOTIFICATION MADE 2/7/83 YEs NO EQUIPMENT FAILURE N/A Oves G NO 0.x RE0uts? NO.

REsPONsi.LE su,ERvis0R Dean E. Sharper eArE 2/7/83 P A07 2 l 0PERATING ENGINEER'S CCHh0ENT5 2/3 discharge canal samples showed no significant activity. 10CFR 20 limits were not exceeded due to this discharge. The valves that were inadvertently opened were recarded to plainly indicate that they are out of service.

O EVENT OF Pust rC INTEREST C 2A-aouR arc acTiric2Tioa REo'o C TECH. SPEC. VIOLATION TELEPH REGION 11I DATE TIME

@ NON REPORTABLE QCCuRRENCE N/A TREW/TRECOPY O 'A oAv REPoaTAsLE/T.s.

aEsica iil oATE TIME Ceco CORPORATE NOTIFICATION MADE Q ANNUAL /SPECL REPORT REC'D OF ASOVE NOTIFICATION is PER IOCFR21 10 CFR 20.405 A.I.D. m

5. DAY WRITTEN REPORT REC'D PER 10CFR21 Te ecopy Dennis P. Galle.

2/9/83 1403

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B. B. Stephenson 2/7/83 1230 tem Ceco CORPORATE OFFICER DATE TIME PRELIMINARY REPORT Michael Wr,ight 2/9/83 CCMPLETED AND REVIEWED A,

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s Description of Event (con't)

This situation was not recognized by the operator or the Radwaste Foreman involved with the heating boiler flush. At the time "A" heating boiler was blown down to the storm sewer, the radioactivity was 4.6 X 104 pei/1, per the 2/5/83 sample. The "A" boiler blowdown was secured at 0400 hours0.00463 days <br />0.111 hours <br />6.613757e-4 weeks <br />1.522e-4 months <br /> on 2/6/83. Total blowdown was 3/4 of the steam drum sight glass which is approximately 700 gal.

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