ML18219C131

Letter from Indiana & Michigan Power Co to NRC on Situations Concerning an Event Which Occurred at the D.C. Cook Nuclear Plant No. 1 on 2/6/1975

ML18219C131
Person / Time
Site:	Cook
Issue date:	02/21/1975
From:	Dolan J Indiana Michigan Power Co
To:	James Keppler NRC/RGN-III
References
Download: ML18219C131 (12)

Text

,~C DISTRI "UTIOV FOci PART 50 DOCI'ET I lA1 t'RIAL (TEi.lPORARY FORiil)

'ONTROL NO: 2217 Indiana & Nich. Power Co DATE OF DOC DATE REC'D LTR OTHER New>York, N.Y. 10004 J.E. Dolan 2/21/75 2/26/75 XX ORIG CC OTHER SEiVT AEC POR"~~

J.G. Keppler 1 signed SENT LOCAL PDR CLASS UiVC LASS PROPINFO INPUT NO CYS REC'D DOCK"- T ISO:

XXX 1 signed 50-315 DES RIPTIOV ENCLOSURES:

Ltr ref, 2/7/75 telecopied rpt. re: an un-sampled release of a waste holdup tank. ~ ~

water releases 2/13/75 had a high concen- Attachment A - Liquid re'leases from tration of boric acid and info. re: lake waste evaporator condensate tanks water sampling program with the following attachment: ~Cr~rOVSLZDGEO iVAME:

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INDIANA 5 MICHIGAN POWER COMPANY P. O. BOX 18 BOWLING GREEN STATION NEW YORK, N. Y. 10004 Operating License DPR-58 Docket No. 50-315 February 21~ 1975 Mr. Z. G. Keppler, Regional Director Directorate of Regulatory Operations United States Nuclear Regulatory Commission Region III 799 Roosevelt Road Glen Ellyn, illinois 60137

Dear Mr. Keppler:

On February 7, 1975, we telecopied a report, to you describing an event which occurreC at the Donald C. Cook Nuclear 'Plant Unit No. 1 on February 6, 197$ . In that letter we stated that an unsampleC release of a waste holdup tank was made in violation of Appendix 3 Technical Specifications Sections 2.4.2 b and 2.2.3.3. The South

>laste Evaporator Condensate Tank was releaseC to the discharge tunnel rrithout having been sampled for radioactivity and boron concentration.

On February 13, 1975, as we were preparing to send our 7 day followup report to you, 1re discovereC that we had experienced the following situations:

a. In the water releases which we have made to date, the concentration of boric aciC exceeds the limit set by Table 2.2-1 of our Environmental Technical Specifications, and

b. lfe are required in Table 4.2-1 of the. Environmental Technical Specifications to carry out a lake water sampling program, "Every 4 weeks or 24 hours2.777778e-4 days <br />0.00667 hours <br />3.968254e-5 weeks <br />9.132e-6 months <br /> after a batch release". >le have been sampling every 4 weeks, but not after every batch release.

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Mrs .. J. G. Keppler February 21, 197$

These additional two occurrences were reported to your Mr. E. L. Zordon by R. S. Hunter in a telephone call on February 13, 1975'nd in, a letter dated February 14, 1975.

ln that letter w~e asked and obtained permission, for an extension of the time to submit our report to you to February

21) 1975 The following report outlines the reasons for each of the three violations and the corrective actions taken-

1. R of U o e Wa te E o to Co e te T The South Waste Evaporator Condensate Tank (SECT) was released to the discharge tunnel without having been analyzed in violation of Appendix "B" Technical Specifications Sections 2.2.3.3 and 2.4.2.b.

The release was monitored by the Radiation Monitoring System (R-18) which was in operation. The release did not result in an alarm of monitor (R-18) and the recorder trace indicated no radioactivity in the release.

Immediately prior to the event the North I'"CT had been filled, recirculated and sampled in preparation for a release. >Ihile waiting for the analytical results of the sample for the North M'".CT, it was isolated and the South 3'PCT was filled and.placed, on recirculation. The release permit for the NorthRPCT was. approved but the North >1ECT was not placed in the proper valve line up and the South HECT was released instead of the North RECT.

The North and South >BCT'so had both been filled from the Station Drainage Dirty Maste Holdup Tank. Immediately after the event occurred the Dirty >laste Holdup Tank was sampled and analyzed and the radioactivity concentration was less than the detect~hie limits except for tritium rhich was measured't 7.g9 x 10 uCi/cc. The boron concentration of the Dirty Waste Holdup Tank was 3/4 ppm.

Approximately 1640 gallons of water had been transferred from the Dirty >laste Holdup Tank to the South llECT and subsequently released to the discharge tunnel. Based. upon the analytical results above this would have resulted in a release of 47sl uCi of tritium and 4.86 pounds of boron.

There was no hazard to the safety of the public as there was no detectable gamma activity released.

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~> I Mr. Z. G. Keppler February 21, 1975 Th'e cause of the discharge vas determined to be an inadequacy in Operating 'Procedure OHP 4021-022.007. The procedure did not address the steps to follov vhen a 3'ZCT had been isolated after sampling and subsequent line up to assure the proper HECT vas being discharged.

A Temporary Change to Operating Procedure OHP 402.022.007 was placed in effect on February 7, 1975 to delineate the proper steps to follov for releasing a >PCT that had been isolated after sampling and is subsequently approved for release.

A permanent change to Operating Procedure OHP 4021.022.007 will be made prior to February 21, 1975. The American Electric Power Service Corporation's Nuclear Safety and Design Reviev Committee recommended that the permanent revision provide for independent verification of the proper system valve lineup prior to starting a release of potentially radioactive liquid to the discharge tunnel.

2. R e of N st E or to Co t T E ce of Horo Conce tr tio L mit Attachment A lists the release..information regarding the boron concentration as discharged.

Mhile the boron concentration in the tanks was measured 'before release, the Operating Procedure OHP 4021.022.007 did not include a requirement to calculate the boron concentration after dilution in the circulating water flow before the tank is released to insure it is belov the limit in Table 2.2-1 of the Environmental Technical Specifications.

Operating Procedure OHP 4021.022.007 is being revised to include this requirement.

The total quantity of boron released from the tanks .

amount to less than 75 lbs., vhich is less than the Estimated Maximum Annual Discharge listed in Appendix 3 Technical Specifi-cations Table 2.2-1.

With the exception of the one tank referred to in Item 1 above, all waste evaporator condensate tanks released vere sampled for radioactivity before release and they all had'ndetectable amounts of radioactive isotopes, except for tritium vhich is listed in Attachment A and, which is seen to be at a very low level.

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C 47 Nr. J'. G. Keppler February 21, 1975 There was no hazard. to the safety of the public as there was no detectable gamma activity released. The boron concentrations as released are within the range of background boron concentration existing in Lake Michigan.

3 0 L F T Table 4.2-1 of the Environmental Technical Specifications requires lake water samples to be taken at seven locations (2 background stations and 5 indicator stations), "Every 4 weeks or 24 hours2.777778e-4 days <br />0.00667 hours <br />3.968254e-5 weeks <br />9.132e-6 months <br /> after a batch release".

We are sampling these stations every 4 'weeks, but specification means that we'ust if the.

sample these stations after each batch release, we have not been carrying out this step.

Our last two lake water samples were taken on January 18, 1975 and February 3.5, 197$ . Due to ice conditions at the lake shoreline on-site samples could not be, taken.

Samples at public water stations were taken.

We have not been taking lake water samples after every batch release because We had interpreted this specification to mean that there must be a least one sample taken every 4.

weeks, and. that when possible this sample should be taken within 24 hours2.777778e-4 days <br />0.00667 hours <br />3.968254e-5 weeks <br />9.132e-6 months <br /> after a batch release. We are seeking a clarification of this collection frequency requirement.

Very truly yours, JED: mla ohn E ~ Dolan Exe tive Vice President Engineering and Construction American Electric Power Service Corporation cc: R. J'. Vollen, Esq.

R. C. Callen, Esq.

P. W. Steketee, Esq.

R. Walsh, Esq.

G. Charnoff, Esp.

R. W. Jurgensen E. G. Case

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d Attachment A INDIANA AND MICHIGAN POWER COMPANY DONALD CD COOK NUCLEAR PLANT LIQUID RELEASES FROM'ASTE EVAPORATOR CONDENSATE TANKS Discharge Discharge Concentration Concentration Gallons of Tritium of Boron Date D~dd d uC/ml. PPM B 2-1-75 600 4. 84. X 10' 0.0003 2-2-75 1200 5 77 10 0.0317 2-2-75 1305 2.89 X 10 0.0189 2-3-75 1305 5. 28 X 10 0.031 2-3-75 1320 h.. 84. X 10-10 0.029 2-3-75 1305 .2.31 X 10 0.01'36 2-4-75 1020 2.97 X 10 0.023 2-4-75 960 2 93 X lp 0.0143 2-5-75 1365 2.96 X 10 0.0175 2-6-75 1335 <4-.14 X 10 0.0189 2-6-75 1320 3. 10 X 10 0.019 2-6-75 1320 2 35 X 10 0.0139 2-6-75 1539 3 96 X 10-" 0.0185 2-8-75 1290 3 ~5 X 10 0.013 2-10-75 1320 4'39 X 10-'0 0.0172 2-9-75 1320 2.98 X lp 0.014.

2-11-75 1365 5.4.7 X 10 0.013 2-11-75 1305 3.09 X 10 0.009 2-12-75 1380 7 + 33 X 10 0.002 2-13-75 1335 7.22 X 10 0;003 2-14-75 I'76 1.05 X 10-9 0.011

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