ML19220B127
| ML19220B127 | |
| Person / Time | |
|---|---|
| Site: | Crane  |
| Issue date: | 03/02/1977 |
| From: | Vassallo D Office of Nuclear Reactor Regulation |
| To: | Arnold R METROPOLITAN EDISON CO. |
| References | |
| NUDOCS 7904250464 | |
| Download: ML19220B127 (3) | |
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In varicus recent naetincs and teicobone ccnversations bet. teen # :ers T
o# ycur staff ar" ours, the design o# equicrant needed to miticat? the consecuences of a steam. line break acci fent on Three Mile Island, '? nit 2 has bean discussed. Durinn the meetinc c' c bruary 1^,,
l~77, our e
ecsiticn on t1is att9r ' ras clarified, and is sunrarized belou.
For a snontanecus break any'.there in a rain steam or main feedwater (secondary syster) line, accident conseluences ust be mitigated onl.v by safety arada equie ent.
"cua ter, #cr the ass': red single failure in safety grade acuir ent, cr?i-rav be taken for ncn-safety c"2da enui-nent as a backun.
or tr.csa corticns of the secordarv systen '.ne, e a breck ri ' t "e r
caused hv a seisnic event, accident consecuences nus' be nitic-ted only by seisnic Categcry I comnenents. in acccriacca with ^eneral Design Criterion 2, after assuring single failure in arv seisnic I
^ tegory I concerent.
3 Your cresent analyses of the seccndary systen line --nak accidents are ot based on ritigatiag the consecuences c# those accidents :y equiorent as stated above.
In a:ldition, thev do not address breaks initiated by a seismic event.
For these reasons, the analvses are not acceptable.
i If it can be shcun that the unmiticated consecuences o# any seccriarv s'staa line break accident on this niant are accentable, consi"arir' the abcVe casiticns and assu-inn a stuck rcJ and the availabiliev er unavaila"flity o# offsite Oc-:ce, d ichev2r is trorsa, t';'n the Tres?n i
3" sten jasian ".culd be considered ac 30tale.
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In crder to escure that licensinc actions,roceed ir a ti-@/. s nr.ar.
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If it 3Doears t'.at these acti:ns cannot be cor'oleted before the ex ected fuel leadino hte, 'te woul '
give consideration to arguments justifyinn short term clant onoration Orior to comcletion of that pro < ran.
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D. B. Vassallo, Assistant Director of Light Water Reactors Division o# Project 'Mnacement
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Chairman York Committee for a Safe Environment 2586 Broad Street York, Pennsylvania 17404 Mr. Richard W. Heward Project Manager GPU Service Corporation 260 Cherry Hill Road Parsippany, New Jersey 07054 Mr. Thomas M. Crimmins, Jr.
Safety and Licensing Manager GPU Service Corporation 260 Cherry Hill Road Parsippany, New Jersey 07054 73-242 3