ML19199A566
| ML19199A566 | |
| Person / Time | |
|---|---|
| Site: | Crane  |
| Issue date: | 02/17/1977 |
| From: | Ross D Office of Nuclear Reactor Regulation |
| To: | Vassalo D Office of Nuclear Reactor Regulation |
| Shared Package | |
| ML19199A564 | List: |
| References | |
| NUDOCS 7905040157 | |
| Download: ML19199A566 (2) | |
Text
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O MDiCRASDUM FOR:
D. 3. Vassallo, Assistant Director for Light Water Reactors, DPM FRati:
D. F. Ross, Assistant Director for Reactor Safety, DSS 51DLfe'CT:
REQUEST FOR FURN LTORMATION, III-2 Plant Name:
Three Mile Island, Unit 2 Docket su:mber:
50-320 Mf1eatone L aber:
27-24 Licensing Stage:
OL Rasponsibla 3 ranch LWR 4 and Project Mmmear:
H. Silver Systems Safety Brar.ch Involved: Cors Performance 3 ranch Description of Raview:
Supplemental Questions Requested Casplation Data:
RA Review Status:
Cecrplata The Physics Section of the Core Perfornance Branch has prepared the enclosed supp1== ental question for Three Mila Island, Unit 2.
S igi-.C M r.-J ~7
- p. y.'t.::.1 e Dou A F. Ross, Jr., Assistant Director for Reactor Safety Division of Systems Safety
Enclosure:
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- Form AIC.318 (Rev. 9-5 5) AZCM 0240 2 u. s: sovsannetW perwrime orrters i,ra.sas.l.e y e Ii 1
Enclosure Supplemental Question for Three Mile Island 2 232.1 A recent submittal by 35W (Amendment 2 to the PSAR of 3SAR-205, Docket No. 50-561) indicates that the scram reactivity function amployed in the safety analyses for TMI-2 cay have been non-conservative.
In particular the ceasured curve of reactivity inserted as a function of fractional control rod insertion cay have been non-conservative with respect to the curve used in safety analysis.
Provide information to show that reactivity inserted as a function of ti=e as assumed in the safety analysis is consistent with the recent measurements or provide reanalyses of transients and accidents which are affected by scram reactivity insertion time.
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