ML20085H043

AO BFAO-50-259/7450W:on 740922,conductivity of Reactor Coolant Not Monitored within 8 H,Per Tech Spec Requirements. Caused by Personnel Error.Sampling Interval During Periods Reduced to 4 H

ML20085H043
Person / Time
Site:	Browns Ferry
Issue date:	10/02/1974
From:	Eric Thomas TENNESSEE VALLEY AUTHORITY
To:	Case E US ATOMIC ENERGY COMMISSION (AEC)
Shared Package
ML20085H046	List: ML20085H043 ML20085H051
References
NUDOCS 8308300114
Download: ML20085H043 (3)

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0 TENNESSiEE VALLLet AUTHO?tl'IY I~~.Jg ~7 r CHATTANCOOA, TENNESSEE

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50-259 d ONN r % * .s'A Mr. Edson G. Case Acting Director of Licensing Office of Regulation U.S. Atomic Energy Co:=ission Washington, DC 20545

Dear Mr. Case:

T3nTES3EE VALLEY AUTIIORITY - BROWS FERPfl liUCLEAR PIAIIT UNIT 1 -

DOCIGT UO. 50-259 - FACILITY OPERATING LICEUSE DPR ABUORVAL OCCURRE: ICE REFORT BFAO-50-259/7450W The enclosed report is to provide details concerning the conductivity of the reactor coolant which was not monitored within 8 hours9.259259e-5 days <br />0.00222 hours <br />1.322751e-5 weeks <br />3.044e-6 months <br /> as specified in Section 4.6.B.1.c of the technical specifications and is submitted in accordance with Appendi:: A to Regulatory Guide 1.16, Revision 1, October 1973. This event occurred on Browns Ferry nuclear Plcnt unit 1 on September 22, 1974.

Very truly yours, TEHIESSEE VALLEY NJTHORITI V

E. F. Thomas Director of Power Production Enclosure b- s CC (Enclosure): j -- c)

Mr. Norman C. I:oseley, Director eg /

Region II Regulatory Operations Office, USAEC iy / ,)

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-ABNORMAL OCCURRENCE REPORT Report No.: BFAO-50-259/7450W Report Date: October 2, 1974 Occurrence Date: Septenber 22, 1974 Facility: Browns Ferry Nuclear Plant unit 1 Identifiention of Occurrence The conductivity of the reactor. coolant was not monitored within 8 hours9.259259e-5 days <br />0.00222 hours <br />1.322751e-5 weeks <br />3.044e-6 months <br /> as specified in Section 4.6.B.1.c of the technical specifications.

Conditions Prior to Occurrence The reactor was in the cold shutdown condition during a planned maintenance outage.

Descrintion of Occurrence During the outage, the continuous conductivity monitor was made inoperable tien the reactor clea:utp de=ineraliser system was re=oved from service. The radio-chemical laboratory initiated a grab cr._ple program from the nor=al se=ple line using a s"11 portable laboratory senple pu=p at approximate 4 6-hour intervals. The third grab sa=ple of pri=ary coolant was obtained at 2330 hours0.027 days <br />0.647 hours <br />0.00385 weeks <br />8.86565e-4 months <br /> on Sep'ccmber 21, 1974. Following this primar/ coolant grab sa=ple, flow was lost and was not reestablished before 8 hours9.259259e-5 days <br />0.00222 hours <br />1.322751e-5 weeks <br />3.044e-6 months <br /> elapsed.

. Ane_1ysis of Occurrence There are tuo semple lines provided for prirs.ry coolant: (1) inlet to the RUCUS dcmineralizers, and (2) the "A" recirculation pu=p discharge. Both systems vere shut 'down, end primary coolant pressure 'was insufficient to provide a sample.

Initially, this prob 1cm was eliminated by the use of a portable laboratory sampling pu=p. This sa=pling pu=p lost its capability to provide a fourth sagle; and before this temporar/ sorpling configuration could be funy checked out, time expired. Recognition that this pu.p was unable to provide a fourth primary coolant grab st=ple did not occur soon enough to establish an alternate

. RHR system alignment. Thus, the fourth pr4~"y coolent grab semple was not obtained until 1045 hours0.0121 days <br />0.29 hours <br />0.00173 weeks <br />3.976225e-4 months <br /> en September 22, 1974. The total elapsed time between

• sa=ples was 11.25 hours2.893519e-4 days <br />0.00694 hours <br />4.133598e-5 weeks <br />9.5125e-6 months <br />. Post enalysis indicates that either a sampling valve was closed since collection of the previous sample or operating conditions '

exceeded the sampling pu=p design capability.

. It is noted that the intent of Section 4.6.B.l.c of the technical specifications, as described in the bases, is to collect primary coolant samples at least once a shift when the continuous conductivity monitor is unavailable. This intent was not violated.

The results of sa=ples analy:cd before and after the occurrence showed that i s both the conductivity and chloride concentration were within allowable technical i

specification limits. There were no adverse effects to the health and safety of the public as a result of this occurrence.

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Corrective Action The se::pling interval during periods when the continuous conductivity r:onitor is inoperabic has been reduced to 4 hours4.62963e-5 days <br />0.00111 hours <br />6.613757e-6 weeks <br />1.522e-6 months <br /> allowing additional tir.c to handlo unforeseen sa: pling difficulties.

Failure Data ,

. Not applicable.

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