ML20085K264

Ro:On 730729,during Surveillance Testing,Msiv 3-203-1B Had Closure Time Above Tech Spec Limit.Cause Not Found.Insp Will Be Conducted Before Facility Startup.Followup Rept Will Be Submitted

ML20085K264
Person / Time
Site:	Dresden
Issue date:	08/07/1973
From:	Worden W COMMONWEALTH EDISON CO.
To:	Giambusso A US ATOMIC ENERGY COMMISSION (AEC)
Shared Package
ML20085K261	List: ML20085K259 ML20085K264
References
559-73, NUDOCS 8310200369
Download: ML20085K264 (2)

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Ccmm :lth Edis n onal PtagChicago, lHinois Q

@ One First Address Reply to: Post Office Sox 767 Chicago. lifinois 60690 Dresden Nuclear Power Station R. .R. #1 -

Morris, Illinois 60450 - .?x sy

,[f ,p I N>k WFW Ltr. #559-73 August 7, 1973 'I; i l (' W l

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\ . 4:. O. C Mr. A. Giambusso Deputy Director for Reactor Projects j[v$

• g Directorate of Licensing Al "' hA-U. S. Atecic Energy Cassission Washingten, D.C. 20545 SUBJET: LTCETSE DF'4-25. DRFSDni !mCIEAR P(MR STATION tntIT #3.

SECTICN 6.6.C.107 W5 T3""ICAL SPECIFICATICHS.

FAST C105t3E CF FSIV 3-203-13,

References:

1) Ietter frec W. P. Uorden to Mr. Giambusso dated December 8, 1972, concerning Fast Closure Time on lB" ISIV.

2) Notification of Region III of AEC Regulatory Operations.

Telephone: F. !! aura,1030 on July 30, 1973 Telegram: B. Grier, 1250 on July 30, 1973

3) Dv:gs: P + ID M-345

Dear !!r. Gia=busso:

This is to report a cendition relating to the operation of the unit, den during surveillance testing, rain steam isolation valve (!SIV) 3-203-1B was fcund to have a closure ti=a of 2.6 secs, dich is cutside the limits specified in the Technical Specifications (Table 3.7.1). These limits are 15 sees and a 3 secs.

PROBIm ATTD ItiVESTIGATIOPi At 0050, July 29, 1973, with the reactor at a power level of 50 MWe, quarterly ISIV ticing survenhnce was being conducted.

During these tests, it was discovered that IEIV 3-203-1B hcd a closure time of 2.6 seccnds, faster than the 3 second to 5 second limits specifiai in the Technical Specifications (Table 3.7.1). Both valves in the B" steam line were prenptly closed in accordance with section 3.7.2 of the Technical Specifications, and was naintained in that cc:xlition until a subsecuent shutdown. The ESlV's en the other three steam lines had closure times 'within the 3 second to 5 seccexi limits. -

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, , Mr. A. Giambuseo August 7,1973 The limits specified on fast closure of the HSIV's are intended to prevent a rapid reactor isolation, and subsequent rapid reactor pressuri-sation and resulting relief valve operation. Closure of one }EIV in 2.6 seconds instead of 3 seconds does not significantly increase the pressure spike or the potential for relief valve operation. Additionally, any pressure transient free the fast clesure of one ISIV wouM be " softened" by the slower }SIV closure on the other three lines. Consequently, it is concluded that the fast closure of the 3-203-1B F3IV was of no safety significance to the public or plant personnel.

CCRREunvs ACTIC4 At present, Unit 3 is in the shutdown cotulition. Inspection of "lB" MSIV speed centrol will not be performed prior to letter issuance but will be made before unit startup.

A followup report will be issued to specify the results of the investigatien, the corrective actien taken, the resulting MSIV travel time, armi the date on which "B" steam line is returned to service.

Sincerely,

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W. P. Wortien Superinterelent Dresden Station WPW:ID:jw ec: Pile /AECCorr. Cat.I

A Comm mith Edison l 50-237/249

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,k} One First Nynal P1323. Crucago, tilinois p[\ Q' Address Reply to: Post Office Box 767 i Chicago Ilknois 60690 '

WPW Ltr.f572-73 Dresden Nuclear Power Station R. R. #1 , ,

JN Morris, Illinois 60450 g -h N' August 10, 1973 . .M, -

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AUG151973P QF Mr. A. Giambusso Deputy Director for Reactor Projects jg N ',> ..

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, Director of Licensing n'j ,,qg U. S. Atomic Energy Co:: mission N '~7a Washington. D. C.

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20545

SUBJECT:

LICENSE DPR-19/25, DRESDEN ?PJCLEAR PO'JER STATION, UNIT d2/3.

_ SECTIO:I 3.8.D OF Til?. TECit'iIC\L SPECIFICATIONS.

HIGH ACTIVITY 113 ABOVE GROUND TANK "B" FLOOR DRAIN SAMPLE TANK.

References:

1. Notification of Region III of AEC Regulatory Operations Telephone: G. Fiore111, 1400 hours0.0162 days <br />0.389 hours <br />0.00231 weeks <br />5.327e-4 months <br />, on 8-2-73.

Telegram: B. Crier, 15G0 hours, on 8-2-73.

2. Dwgs: P & ID M-44.

Dear Mr. Giambusso:

This letter is to reporr a condition relating to the operation of Unit 2/3 Radwaste at about 0820 hours0.00949 days <br />0.228 hours <br />0.00136 weeks <br />3.1201e-4 months <br />, August 2,1973. At this time the 24 hour2.777778e-4 days <br />0.00667 hours <br />3.968254e-5 weeks <br />9.132e-6 months <br /> peried for reprocessing above ground tanks with radioactivity concentrations above 0.7 curies allowed by the Technical Specifications (Section 3.8.D) was exceeded by 2 hours2.314815e-5 days <br />5.555556e-4 hours <br />3.306878e-6 weeks <br />7.61e-7 months <br />.

PROBLEM At 0820 hours0.00949 days <br />0.228 hours <br />0.00136 weeks <br />3.1201e-4 months <br /> on August 1,1973 the processing of water to "B" Floor Drain Sample Tank from the Floor Drain Collector was completed and the B.F.D.S.T. was placed on recirculation for sampling. The sample results indicated the beta-gamma radioactivity to be 1.3x107 pCi/1. This concen-tration combined with a tank level of 82% resulted in a total curie content of 0.89 curies in the "B" Floor Drain Sample Tank.

Although the tank was promptly analyzed, there was a misunderstanding between laboratory and operational personnel concerning the radioactivity reporting. Therefore, action on reprocessing the water was delayed until the morning of August 2,1973 when another shif t foreman verified that "B" Floor Drain Sample Tank radioactivity was 1.3x107 pCi/1.(0215Aours).

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u O O u, Mr. A. Giambusco August 10, 1973 In order to reduce the radioactivity of the water in the "B" Floor Drain Sample Tank to within Technical Specifications limits, at 1105 hours0.0128 days <br />0.307 hours <br />0.00183 weeks <br />4.204525e-4 months <br /> on August 2,1973, the "B" F.D.S.T. was partially transferred to the "B" Neutralizer Tank. At 1135 the concentration of 1.3x107 pCi/1 at a tank level of approximately 637. resulted in a curie content of 0.68 curies in the "B" F.D.S.T.

Before water could be transferred from the "B" Floor Drain Sample Tank to the "B" Neutralizer Tank, the "B" Neutralizer Tank had to be emptied. The Floor Drain Collector,which had filled up again, was transferred to the "B" Neutralizer Tank next. At 1105, August 2, the conditions existed that allowed the transferring of the "B" Floor Drain Sample Tank to the "B" Neutralizer Tark.

INVESTICATION A review was made of the procedures applicable to the incident.

It was determined that in following one operating procedure, the step requiring beta-gacca analysis of the Floor Drain Collector prior to processing was omitted. The delay in reprocessing the water in the "B" Floor Drain Sample Tank was caused by a misunderstanding between laboratory and operational personnel about the radioactivity reporting units.

CORRECTIVE ACTION Enough water in the "B" Floor Drain Sample Tank was transferred to the "B" Neutralizer Tank to reduce the curie content in the "B" F.D.S.T.

to within Technical Specifications.

A review of the appropriate procedures has been made with the personnel involved. In addition, a revision of the operating procedure, 2000-XX, paragraph B, has been ef fected to clarify the section requiring radioactivity analysis of the Floor Drain Collector prior to processing to the Floor Drain Sample Tanks.

EVA1UATION _

The presence of 0.89 curies in th.e "B" Floor Drain Sample Tank did not produce a hazard to the public since it was not released to the river and the tank beta-gamma radioactivity was reduced to below Technical Specifications 26 hours3.009259e-4 days <br />0.00722 hours <br />4.298942e-5 weeks <br />9.893e-6 months <br /> af ter the co11cetion of the first samples. If a failure of the "B" Floor Drain Sample Tank had occurred as described in Amendment #9,Section V.C.1 of the S.A.R., and the radioactivity contained in the tank had been released to the aquatic environment, the limits as I

specified in CFR 20.106 would not have been exceeded when averaged over one year.

i Sincerely, W. F. Worden Superintendent WFW:do

' ec: 4 File-AEC ' Corr. )