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loolamure *a: W'. Viator Stall .Director (boicasurs)

Office of Inspetimainmdbfrmt U.S. ImLar 3..aiatory Caomuiass

_Mnsatoo, DC 20555

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'024t owM-S &d8 - *U MO QWZIA* an@EI to the e~iq.. linw-s , the p oomgeftinu-. ?mlsEa t&- I N 61. di&nt m eaf Mue' ITn W~r' to- tho &Mhiw or require

-2111 thaMet Mtiq Uwean"I a This MWcins 0 mieover .1 WhW the bmwd wm* s Lipesot~, andtb tM tI st~ting wm f to be Imwaree. Me. apparent csmn of this efteeimo wax that boards were ntt

suea WUoia to subequent uizm iweviina.

An In 11I-t1m owueated that the bmudis (a th Um Y Off td Aam boards Uwese alw inus to; re wuair ? of the applioabI &amiqp ,& Af, at ibis UMtIs Met tim M ilrt i*WIsion. Thet CUmmt z'evIaM,= 32, & frec-a tber t1 Wlpn t 6lbomhm's w of'stotaL ofT' 75. at thwse setting GIMMsM -MP nWAuir& beasme at zwieest (bder toads. The m.'aity af SOWua m~nws senste the long dala' tripping tile In 98oar0 L

bft thie CMftii~n am tnAV the lows dela tvipping tia In the MQjwiZF 0C tbW mýwuld hm bum. diffemt thmthat ambaulate fta the respectiv. la~tr conitions. ThIstwoud hxvvereuLtad Inthebreaker tripping tow som or too lato, dspeadinc up= the astting.. tt the breaker trippet t= ac, the e~puiMt, waotuse w=4 tt hare be= damagd. A. IGUIm' trIPPIW tim Gould~ kmo oausut the load protected to overheat, porn.uWiF dMM6LV Motor* or poe. A different tripping tim delay my haver also affeated awcooration, with tim dWlay ftMs d@vIoes or other protective devioes ineta~lle In. the lca"s sered.. The go0-volt sthitdotim boards control. component Woolng systeatpma" spent tfzel cooling pums, control Rod DrIVID Hoheniam oaoILMn 01089, aID& other t0ety-rslated ocapoents which, it they fhtU, oatul4 aftuLy affect the msafty af oprtions at the plant.

Cal eti,. Ac tion.

Imr-QC-~.6,Test 6.05 nd, WB-=C-3.6, Tests 6 throWg 66, ares being revised "A include Instructions and acceptance criteria for verif'icat ion that thu co011ct trip duvice settings tar selective tripping have been applied to the 1es490011"s tYPO DS uuitohgear breakers according ta the app~icable '4estin~iause-OUPPlied setting sheets (drawings 3788A10 through 37880M0) sUPPlied arn contract 741C2-84&647. Revisions to WBNP-QC-3.6 and WBNP-QCP-3.6 will be issued by Ocotber 2, 1981.

A rwfsv f'nc anl preoperstional tests peitoraai wsing this type breaker is in progress to determine the Impact (if any) on preoperational test results. The switchboards will 0e m'insp~ected to verify that the correct settings are applied. All corrective action will be complete by January 4, 1982.