ML20084S390
| ML20084S390 | |
| Person / Time | |
|---|---|
| Site: | Quad Cities  |
| Issue date: | 07/25/1975 |
| From: | Kalivianakis N COMMONWEALTH EDISON CO. |
| To: | Office of Nuclear Reactor Regulation |
| Shared Package | |
| ML20084S391 | List: |
| References | |
| AO-50-254-75-16, NJK-75-382, NUDOCS 8306160712 | |
| Download: ML20084S390 (3) | |
Text
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- Commonw Edison i
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. Quad Cities ar Power Station i
Post Othee 16 Cordova,Ilknois 61242 Telephone 309/654-2241 1j q
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w July 25, 1975 Director of Office of Nuclear Reactor Regulation U. S. Nuclear Regulatory Cormiission Washington, D. C. 20555 Re ference: Quad-Cities Nuclear Power Statler Docket No. 50-254, DPR-29, Unit 1 Appendix A, Sections 1.0._A.8, 6.6.B.l.a Enclosed please find Ibnormal Occurrence Report No. 50-254/75-16 for quad-Cities Nuclear Power Station. This occurrence was previously reported to Regior 111, Directorate of Regulatory Operations by telephone on July 18, 1975 and to you and Region lil, Directorate of Regulatory Operations by telecepy on July 18, 1975 This report is submitted tc vou in accordance with the requirements of Technical Specification 6.6.B.l.a.
Very truly.yours, COMMONWEALTH EDISCN COMPANY QUAD-CITIES NUCLEAR POWER STATION
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N. J. Kallvianakis Station Superintendent NJK/,LH/lk L
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Region ill, Directorate of Regulatory Operations J. S. Abel
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REPORT NI)M8ER: A0 50-254/75-16
- REPORT DATE : July 25, 1975 OCCURRENCE DATE,: July 17, 1975 FACILITY: quad-Cities Nuclear' Power Station Cordova, 111. 61242 IDENTI F1 CATION OF OCCURRENCE:
Unsampled laundry water was adde the "A" floor drair. sample tank and to d
' the ri ver..
CONDITIONS PRIOR TO OCCURRENCE:
IUnit l was operating steady state at 662 MWe.
Unit 2 was operating steady state at 594 tWe.
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. DESCRIPTION OF OCCURRENCE:
At 10: 15 a.m. on' July 17,1975, discharge of "A" floor drain sample tank to the river, batch number 3476, was commenc_ed. The sample activity was 2.45 X 10-3 ucl/ml in "A" floor drain sample tank.
The "A"' floor drain sample tank was being discharged to the river by gravity
. feed. At 6:30 p.m. on July 17, 1975 the laundry drain sample tank was placed on recirculation' prior to having radiation protection take a sample. At 7:30 p.m., the operator noticed a 2.0% increase in the "A" floor drain sample tank level and immediately stopped the discharge of the "A" floor drain sample tank -to the river.
The operator discovered a 60% drop in the laundry drain sample tank level.
c Upon further investigation valve 1/2-2099-146 was found to be open and not
' locked closed..
DESIGNATION OF APPARENT CAUSE OF OCCURRENCE:
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I Operator Performance Prior-to discharging the "A" floor _ drain sample tank to the river (batch-number-3476) a valve -lineup and checklist' as required by the ' discharge sheet l-was performed.- This particular valve checklist indicated that valve _1/2-L 2099-146 was locked closed.
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Evidently the operator.did not check closely enough to determine whether
'valvef /2-2099-146 was'in. fact closed.
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A0T50-254/75-16 July 15, 1975 ANALYSIS OF OCCURRENCE:
' The discharge of "A" floor drain sample tank had begun at 10:15 a.m. on July-17, 1975 and was stopped at 7:00 p.m.
At 6:30 p.m. the laundry drain sample tank was placed on recirculation and was terminated at 7:00 p.m.
During the time the laundry drain sample tank was on recirculation a 60%
decrease in the laundry drain sample tank level and a 2% increase in "A" floor drain sample tank level were noticed.
The amount of water added to the "A" floor drain sample tank was approxi-mately 420 gallons and the amount of water emptied from the laundry drain sample tank was approximately 571 gallons. Therefore 151 gallons of un-sampled water was discharged to the river.
At 10:30 p.m. the romaining water in the laundry drain sample tank was sampled.
The sample activity was 1.26 X 10-4 uci/ml which was less activity
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than the "A" floor drain sample tank activity of 2.45 x 10-3 ucl/ml.
It can therefore be concluded that from the period of 6:30 p.m. to 7:00 p.m.,
the laundry drain sample tank was being discharged to the river rather than the floor drain sample tank and, simultaneously, the contents of the laundry drain sample tank were being added to the floor drain sample tank. The i
discharge rate for discharging 151' gallons in 30 minutes would be approximately 5 gallons per minute. The allowed disc.harge rate, based on the activity in the laundry drain sample tank was 41.7 gpm; therefore, no discharge rates were exceeded and there was no effect on the health and safety of the public i
from this occurrence.
CORRECTIVE ACTION:
Both the "A" floor drain sample tank discharge to the river and the laundry drain sample tank recirculation were immediately stopped.
Samples were taken of the "A" floor drain sample tank and laundry drain sample tank.
Recently radwaste foremen were selected to be directly responsible for all radwaste operations.
The radwaste foreman in charge of each shift must now verify the valve checkoff list prior to discharging to the river.
This redundancy in valve lineup checking should remove any possibility of improper valve lineups preceding discharges to the river.
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FAILURE DATA:
Two similar occurrences have taken place in the past at quad-Cities Station (A0 50-254/74-38 and A0 50-254/75-14).
Both of these involved operator pe rformance. The redundancy of having both the radwaste foreman and the radwaste operator verifying proper valve lineup should preclude any furhter occurrences of this type.
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