ML19220B906
| ML19220B906 | |
| Person / Time | |
|---|---|
| Site: | Crane  |
| Issue date: | 06/13/1978 |
| From: | Bosnak R Office of Nuclear Reactor Regulation |
| To: | Varga S Office of Nuclear Reactor Regulation |
| References | |
| NUDOCS 7904270643 | |
| Download: ML19220B906 (2) | |
Text
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JUN 131978
E.'..L A :. F ^ 't :
S. 'hrga, Chief, Lignt 'fator wact FP.T. :
.)rs Sranch J4, _T R. J. Sosna!., Chief, '!cchanical En i SU3]ECT:
C3 ; TAI'i." Erit "E,'iT A:!D PURSE SYSTE?i IS Plant.Mnc:
Licensing Sta ~ -Three :!11e Island Unit 2 TIT! "'L',25
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Res?onsible r.Grancn S Prcject M Rescondir.g SS 0. ranch & Technical R anager:
Reviev Status:
LWR-4, H. Silver Awaiting Infor.ationeviewer:
EU, 7 J. Aiessel In resror.se to your request vent and purge systen isolationreviewed the descript valves contained in Sectionety evalult of the T'!I 2 SAR.
Adecuate responses to the atta 9.4 15 2 3 are reautred tefora we can con-hed requests for additi tete our review of tnis mattonal information er.
/s R. J. Bosnak, Chief Division of Syster.s Safety % c cc w/ encl:
.. J. ?!a ttson, OSS J. P. Knignt, DSS
Contact:
R. I. Tedesco RJKieesel DSS G. C. Lainas,,055 X27533
. Cherny, CSS
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MECH 3NICAL ENGINEERING BRANCH DIVISION OF SYSTEMS SAFETY THREE MILE ISLAND tJNIT 2 1.
Indicate what supportive tests have been performed to verify the torque calculated for the containment vent and purge system isolation valves which is reported in Amendment 59 (Sec. 9.4) of the FSAR.
2.
Also in Amendment 59 (Sec. 9.4) of the FSAR it is reported that valve component stress levels do not exceed the allowable stresses as specified in the "Draf t ASME Code for Pumps and Valves".
Since this draf t code is primarily concerned with pressure boundary integrity, indicate the criteria used for determining the adequacy of the non-pressure boundary components wh':ch are essential for proper valve closure and sealing.
3.
Alternatively, demonstrate that the valves will procerly seat and remain leak tight should no counter torque be available due to failure of the operator or its connecting linkage.
.