ML19199A492
| ML19199A492 | |
| Person / Time | |
|---|---|
| Site: | Crane  |
| Issue date: | 01/20/1978 |
| From: | Herbein J Metropolitan Edison Co |
| To: | Grier B NRC Office of Inspection & Enforcement (IE Region I) |
| References | |
| GQL 114, GQL-0114, NUDOCS 7905030005 | |
| Download: ML19199A492 (2) | |
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e,, m.m.,u METROPOLITAN EDISON COMPANY :vestow ce censm. pusuc ununis ccucunan
.;.. nFFICE ScX 542 REAOING, PENNSYLVANI A 19603 TE LEPHCNE 275 - 929-;601
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U. S. Hucicar Regulatory Cc==ission
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":"nree Mile Island Huclear Staticn Unit 2 ('~.'C-2) u, cense 1, c. C-r,r.-cc e
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i In res;cnse to I. E. Sulletin 5c. 7f-05, Metrepelitan Edisen C:=;any reviewed the .'C-2 safety syste=s as indicated in cur letter GC CCC6 cf January 13, 1978.
In respcnse to I. E. Sulletin 77-05A, Met-Ed expanded its re tiev cf the
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safety systens to include all connectors which are required tc function t: =itigate an accident where the a :ident itself eculd adversely affect the ability of the syste= to perfor= its safety fancticn.
S is review included areas cutside of centai--a-- as well as conditiens cther than a LCCA.
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.. a asse=blies concerned are these used fer the centrol red drive =echanis=s (CRIM's) and the neutren detectcrs. Cnly the reacter detect rs are cf concern, since any pcVer failu e to the C?.EM results in a full inserted red conditien. As stated in cur letter GC CCC6, it should be noted that the electrical connecters used in cen* unction with the neutren detec crs are =anufactu ed by a different ec=;any than these which vere tested by Sandia Laterateries.
2.e Fever Range Huelear Instrunents (NI's) are net required. to =itigate a= accident.
Ecvever, if the 32's were required : =itigate an accident, it is in cur cpinien, that they vculd be capable of doing sc.
Sis cenclusien is based en tvc facters :
- 1) the vide physical separatien betveen the Main St es: (an. Feedvater) lines and d
the electrical cennectors, and 2) the very shcrt time inte: tal in which the 3 's vculd be required to fanctict f:r the design basis accident. Fer these reascns the 3I ccnnec crs veuld. net be adversely affected by the accident enviren=ent pricr t,..
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.e which produce adverse envire== ental cenditiens.
If you have any questions, please centact =e.
Sincerei,
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Mr. 3. H. Grier, Director January 20, 1973 0' ' k Ga'%
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Dr. E.~st 'Tc1genau, Director Office of Inspectica i Enforcement U. S. 'Tuclear F.egu.latory Cc==issien
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