ML19276G796
| ML19276G796 | |
| Person / Time | |
|---|---|
| Site: | Crane  |
| Issue date: | 04/17/1978 |
| From: | Herbein J Metropolitan Edison Co |
| To: | Varga S, Reid R Office of Nuclear Reactor Regulation |
| References | |
| G-712-12-594, NUDOCS 7908270516 | |
| Download: ML19276G796 (2) | |
Text
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METHOPOLITAN EDISON COMPANY su.v.nma. ccwousucunums ccecw:cn
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PCST CFFICE BOX 542 READING, PENNSYLVANIA 19603 TELEPHONE 215 -929-3601 April 17, 1978 GQL 071h Director of Nuclear Reactor Regulation Attn:
R. W. Reid, Chief DM Operating Reactors 3 ranch No. k 12;f) g]O
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C. S. Huclear Regulatory Co=ission J
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'gC' Tashington, D.C.
20535
- s Director of Nuclear Reactor Regulation Attn:
Mr. S. A. Varga, Chief Light Water Reactors 3 ranch No. k U. S. Uuclear Regulatory Cecnission Washington, D.C.
20555 Gentlemen:
Three Mile Island Nuclear Station S2-1 DPR-50, Docket 50-269 LII-2 DPR-73, Docket 50-320
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!.. accordance. vith your oral. request-o. April lh,1978, please-be advised f-
= - ---that -33:".hasr-evaluated-the-revised....s=2.,11--break.LCCk ss.criginallv reto:*ed' -~ --
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.cn April 12,-19?v pursuant -to 10 CFR 21.
The evaluation results,
iss=ing~1oss oroffsfte to9e-and ths~mest danaisin's ~sih51s fallure, are ----'-~ ~~ ' ~ ~
as follows:
1.
Assuming no operator action, the core vill remain covered and there is no cladding temperature excursion provided that the:=al go.ver is licited to less than:
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'- TRI-l < 695 'of 2535~ Ut
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TMI-2 < 635 of 2772 ZGt 2.
Assuming cperator action in 20 =inutes to cross connect the HFI discharge and (assu=ing failure of a diesel) open the RPI ESAS discha ge valves to a predetermined throttle setting (which pre-vents HPI pump.mnc:t) che core vculd remain covered and there veuld be no cladding temperature excursion for thermal powers of:
7 9 08 270 f/f
R. W. Reid, Chief S. A. Varga, Chief 2-TIE -1 100% of 2535 MWt "T!C-2 93% of 2772 Gt More detailed analysis nay support a higher power level.
3.
When no single failure is assu=ed or when operator action is taken when accident conditions do not exist (or other LOCA conditions exist) no adverse situation exists or is created and for=er LCCA accident analyses are bounding.-
With respect to Ites 2. above the necessary operator action can be conpleted under adverse circu= stances within 11 =inutes thus allowing 9 minutes for operator reaction.
We are in the process of preparing procedures to acco.plish these operator actions.
We are reviewing other possible long tern solutiens for this situation and vill advise you of our selected alternative.
In the interin the above men-tiened operator action is appropriate and acceptable.
Sincerely, nr
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J. G Herbein 7_.,.
. 'h...ce Presfdent-Generation
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