ML19308C350

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Press Release Discussing 770111 Incident at Fort Calhoun Re Operator Error in Pumping Water from Refuel Storage Tank Into containment,770924 Event at Davis Besse & Two July 1977 Incidents at Trojan Involving Valve Malfunction
ML19308C350
Person / Time
Site: Davis Besse, Fort Calhoun, Trojan, Crane  
Issue date: 12/31/1977
From:
NRC COMMISSION (OCM)
To:
References
TASK-TF, TASK-TMR PR-771231-01, NUDOCS 8001220808
Download: ML19308C350 (4)
v • d • e


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__ _. m THIS CCMPILATICN. OF SELECTED EVDITI IS PRE?ARED TO DISSEMINATE

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~ 'D'FCRI'ATION CN OPERATING EXPERIDiCE AT NUCLEAR ?OWER ?LANTS IN A e d.-

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?USIIC !N GEN"TICfr5 CURL:.2.

hRC l'.A5,' OR IS TAXING CCNTINUCUS ACTION-1-

Z ON THESE ISSUES AS APPLICABLE, FROM AN INSPECTION AND ENFORCEMENT, LICENSING AND-GENERIC REVIE' 5 ANDFOUC.

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n.,n wanuary.l, l w--/ wnlle t.ne cort,a,t.gcun Station Uni;,a was 3

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v c: ara':in, water fr:m the Refueling ',,*ater 5t: rage Tank was pu=ed into the containment thr: ugh the : ntainment spray heider due :: an c; erat r errer.

.During the perf rmance of a quarterly test of the safety inje: tion and containment spray pumps, 'the c erat:r neticed an increase in the containment sum: level approxi=ately tan minutes aftar tne low :res:ure safety injection pu= nad been started.

A::rer.imately 7

5500 galiens of' water had been pu=ed to the ::ntainment.

Abcut ene

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=inute later the ver.tilation-isciation actuation sicnal was received.

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At :nis tima-the opera'tcr. realized he had failed :: foil:w the sur-veillance precedures an,d had left the discharge valve of the icw head safety injecti:n pume-epen..-He i=ediately secured the nu=e.

The Rea:::r C clan:-System was checked for leakage and c:ntair. rent en:ry was =ade ap:roximately one. neur sater.

Ans:ection reveaner.

tha: a discharge fr:m-the c:ntainmen; spray nc::les had occur ed.

A few minutes later power reductierl was started.

A se::nd ::ntain=er.i.

ent y was made about an hour later, after c:ntainment air sa= pies

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l confi: ned that a full face mask wculd provide adecuate respirat:ry pr:tection f:r the levels of radioactivity in the building.

A detailed inspe=ti:n revealed n: sericus ' deficiencies and no ele: rical gr:encs; the power reduction was te: ninated at a pcwer levei Of 555.

Alth: ugh the-:cerator had net feil:wed -he r ced: e and :ne di::harge valve was ::en, the ::ntainmen 3: zy header is:lati:n valve (MCV h,. e c+ ~$ M \\"

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and the low pressure safe y in,'e:tien :: ::;,ncainment s:ny heaterThe cr:ss-c:nne::' valve (HCV-335) sneule nave revented the event.

eie::ric/ neumatie : nverter-en HCV-345 had f ailed and bc:n red and

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green positicn indication lien s were en, indicating the valve was-

- - partially o:en.

P-i :- :: ::d-e nn:-- Fe-auxili a ry-Erei-id.ing E:ui; ent.. '.. ~ 1

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0: era::r had taken local ebn-T:i' Ef the valve' in an"atte. :

letaiy 01:se the valve.

After ab:ut 1/2 inch of stem travel, the

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-ccerat:r re=0ve,. the valve pin and tne va tve went back ::ine third valve (F.C7-325)' ' '.

T. PosiWe'n as cesanded "by 'the va*.ve pestt7ener.

in the incident had a leakage pr:blem that had been previcusly identified

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but n

rre ive acti:n had been taken.

was repia:ac and valve../-c...

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- e pneumatic relay en valve HCV-34 :

in repaired.

Valve HCV-344 and HCV-345 are new required :: be placed in the test mede-prior :: cperating the low pressure safety inje::icn pump er ::ntain spray pump fer testing.

This = de alcng with verifi-j

=atien of-an annunciator will ensure that b th of these valves are in the fully closed pesition prior t: pump opera:icn.k 1

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VALVE.ML.UNCTICNS

?rimary System Depressuri:stien r

On September 24, 157.7, Davis Besse Nuclear p wer Statien Uni:

d No. i experienced a depressurization wnen a pressur;:er pcwer relief valve f ailed in the open positien.

The.?ea ::r C: lan:

aystem (r,.CS) pressure was reduced _.r:m 25:_ ps1g :: c/: psig in a::reximately twenty-one (21) minutes.

At ne beginning f

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this event, 's:eam was being bypassed t: :ne ::ndenser and the reacter ther=al pcwer was at 253 MW, or 9.5".

Eie::ricity

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was not being generated.

The'folicwing systems calfunctioned during the transient:

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Steam and ee5 water Pupture C:ntr:1 System (SFRC5).

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Pressurizer ?ilot A :uated Relief Valve.

Nc., Stea=,.aenerat:r n.uxiliary.-ee, rump sur:1ne.overner.

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The event was initiated at 2134 heurs, when a s:urious ~" half-trip"

urred in the SFRCS, resulting in :lesure of the Nc. 2 ee: water

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Startup Valve and-icss of low : No. 2 Steam Generat:r.

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=ataly one minute later,1:w level in the No. 2 5: sam Genera :t

auseo a-ftAi-SFRCS trip,.:icsing the F.ain Steam Iscia-ien Valves l

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This missine relay wculd n:rmally p : vide a 3" " -

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went aheve or below 2255 psig.

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.ue p:wer relier valve to re.ain open.

It was determined that the auxiliary feed pumo did ac go to full speed because of "bindine." in the turbine :: verner.

Tne transien was analy:ed by the lS55 vender and dets-mined :: be wd. '..h i n

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