ML17252A988
| ML17252A988 | |
| Person / Time | |
|---|---|
| Site: | Dresden  |
| Issue date: | 04/13/1973 |
| From: | Worden W Commonwealth Edison Co |
| To: | Anthony Giambusso US Atomic Energy Commission (AEC) |
| References | |
| WPW Ltr. #292-73 | |
| Download: ML17252A988 (3) | |
Text
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Regutatory *
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Commonwealth Edison Coinpany ONE FIRST NATIONAL PLAZA
- CHICAGO, 1.LLl*NOIS.
Addreu Reply to, P 0 S T 0 f f* I C E B 0 X 7 6 7.
- C H I C A G 0., I L L I N 0 I S. 6 0 6 9 0 WPW:.-Ltr.#292-73.
.. Mr. A. Giambusso Deputy Director for Reactor Projects.*
Directorate of Licensing O. s. Atomic Energy Commission Washington, D *. C.
20545 50-237 249
SUBJECT:
LICENSE.. DPR-19-25, DRESDEN NUCLEAR POWER STATION, 'UNITS 2 AND 3.1.
SECTION 6. 6. B. 3 OF THE TECHNICAL SPECIFICATIONS *
Dear Mr. Giambusso:
'Thi's *ts '"to*'report *a condi*tion *rela*ting to *t*he operation. o.f the
- station in which on April 4, 1973, the Radwaste.Waste Surge Tank was 'found to contain l. 05 curies of radioactivity which exceeds the Technical Speci-fication limit as stated in Section 3.8.D *
. PROBLEM AND INVESTIGATION.
On April 2, 1973 at lll5 processing.of the Waste: Collector Tank water to* 118 11 Waste Sample Tank was initiated through "B Waste Filter and.
the Radwaste Demineralizer.
At 2130 on April 2, 1973, this transfer was.
completed.
Results from a sample taken from the.Waste Collector Tank at.
- 0100. on April 3, 1973 indicated a 80 radioactivity concentration of l.3xl07 picocuries per liter arid a conductivity of 330 micromhos per square centi~
. meter.
On April 3, 1973 at 0245, a sample taken from 118 11 Waste Sample Tank indicated a radioactivity concentration of S.4xl04 picocuries per liter.and a conductivity of 1.6 micromhos per square ¢entµneter.
The water leveiin "B" Waste Sample Tank at this time was 43 percent which corresponds.to a
- radioactivity concent.ration of 0.003. curies.
Further improvement in the conductivity of the water in this tank was desired and additional.demineral-ization was planned prior.to transferring this.batch to a. condensate storage
- tank.
DOCK mo
- USAEC
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- Mr. *A. Giambusso * - _
- _April 13, 1973. -
On April 3, 1973 at_l040 due to*the 330 micromho water bi.the Waste Collector.Tank and. the* possibility of a.slightly depleted Radwaste demineralizer bed, water was again processed from. 'the Was*te *coTlector Tank through "B" Waste Filt,er. and the Radwas.t~ demine.ralizer t.o "B" *Waste -
Sample Tank.
This transfer. was initiated to lower* the Waste. Collector.
water conduct-ivity to a point. where it could be subseq.uently processed through a new deinineral.izer bed for final polishing prior* to transfer to condensate storage.
This transfer was completed at i140 on April 3, 1973 when "B" Waste Sample Tank level reached 91%. *
~e to the inHial.ac0t,i~ity of the Waste Collector Tank and the expected,.d'e:C.on.tain.inat.ion fac.tor*'o.f the filter and demineralizer, the last portion of water transferred from the Waste Collector Tank is' not consid-ered to. have caused the subsequent tank activity.p~oblem~
'At 1740 on April 3, 1973 "B" Waste Sample Tank :water was trans-
-ferred to the Waste Surge. Tank for temporary s.torage until a ne:w radwaste demineralizer bed could be obtained.
In addition, the Waste Surge Tank was also placed on recirculation fOJ'* a sample a.t this time. -._Results of. -
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this sample which were completed at* OHS on April 4, -1973,.. indicated a.
8 r radioactivity concentration of LOxl07 picocuries per liter and a conductivity of 3. lS micromhos per square centimeter.
A radioactivity concentration of LOx107 picocuries per liter and a volume of 36% in the Waste Surge Tank corresponds* to LOS curies.
ln*i,t-i:al "act*i:on--whk*h *was -under*taken -to reduce *the *radioactivity in this tank consisted of replacing the radwaste demineralizer bed.
Processing of the Waste Surge Tank water through "B" Waste Filter and the Radwaste Demineralizer to "B" Waste-Sample Tank was begun at; 1830 on April 4;.
At 2146 on April 4, "B" Waste Sample Tank was placed on recircµlation for a* sample.
Results. of this sample, which*was collected at 2245 following recirculation, indicated a radioactivity concentration of 6.2xl04 picocuries per liter and a tank curie content.of 0.007 curies *.
The source o.£ the' Los curies of radioactivity in the Waste Surge Tank water was determined not to have been "B" Waste* Sample Tank water since this water had. been demineralized and the ion exchange capacity
- of the demineralizer was not depleted.
This conclusion was supported by two additional factors; the reduction in the conductivity of the water which was processed from the Waste Collector-Tank to the Waste Surge Tank and from the decontamination -factor of thtrwater transferred from the Waste Collector.Tank* to "B" Waste Sample Tank.*.*
Inspection of the Waste Surge Tank revealed that sedimentation had occurred in the tank.
Some of this rad.ioact~ve sediment was placed in suspensionwhen the Waste Surge Tank was put on recirculation for sampling *. - This. caused the radioactivity of the water in the tank to increase.
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- Mr. A. Giambusso. April 13, 1973 The presence of 1.05 curies of *.. radioactivity in the water in
- the above ground tank did not represent* a hazard to th~ public since the contents of the tank were not released to the river and the tank <*
radio-
- activity wa*s':' -reduced to less than Technical Specification limits within 18.
hours following* -collection and analysis of the-sample.' If a failure of.
theWaste Surge Tank as described in Amendment #9, section v.c. l of the
- s.A.R.*had occurred and if the radioactivity contained in the tank had been released to the aquadic environment,* the limits specified in 10 CFR 20.106..
would not have been exceeded.when averaged over one year.
-CORRECTIVE ACTION The Waste $urge Tank will be.drained to remove any remaining.
sedimentation.
If this effort.is not success fol, the. Waste Surge Tank will be opened: and manually cleaned.
Additionally, a program for cleaning the.above ground.~anks*
will be formulated by May 31,. 1973.
WPW:do
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WPW Ltr. File Sincerely,
~t&. ~. n1~~~
W. P. Worden Super iri tenden t *
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