ML20085H043
| 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: |
| 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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ONN 'Ad 50-259 r %.s 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):
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Mr. Norman C. I:oseley, Director eg
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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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~2-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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