ML19329E310
| ML19329E310 | |
| Person / Time | |
|---|---|
| Site: | Midland |
| Issue date: | 09/10/1973 |
| From: | CONSUMERS ENERGY CO. (FORMERLY CONSUMERS POWER CO.) |
| To: | Grier B NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION III) |
| References | |
| IEB-73-02, IEB-73-2, NUDOCS 8006120618 | |
| Download: ML19329E310 (2) | |
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ome..: sis w..e uien.a.n av.au..a.c=.on. uicnia.n 4omot. are. coa. si? 7ee oeeo September 10, 1973 MIDLAUD PLA:!T Containnent Purg U u~pply Valve Switch Dockets 50-329, 50-330 Mr. Boyce E. Grier, Regional Director United States Atomic Energy Cermission Directorate of Regulatory Operations Region III yIHIS DOCUMENT CONTAINS 799 Roosevelt Road P00R QUAllTY PAGES Glen Ellyn, IL 60137 O
Dear Mr. Grier:
Your letter of July 27, 1973 requested a design review of the control circuit for the containnent ventilation system isolation valves to be installed in the Hidland Plant. This concern was based on a certain plant in which a single control switch failure resulted in si=ultaneous failure of redundant purgo supply valves, as documented in R.O. Bulletin 73-2.
Please be advised that no containment ventilatica systen isolation valves have been installed.or purchased for either of the Midland Units,
- and hence no corrective action is necessary to prevent occurance of fail-ure indicated in R.O. Bulletin 73-2.
Uc will be taking tha follorin;; precautions to insure that redundant containuent isolation valves installed at Midlsnd are not subject to these failures:
Piping and instru=entation dia;; rams, control logic a.
dicGrans and electrical schc.natic dia;;rens vill show physically and electrical 17'independant controls for pover operated redundant containment isolation valyca.
b.
Since containnent isolation valves are within the scope of 10 CFR 50, 'A_apendi:: 3, Quality Assurance Requirements vill insure that a. above is acconplished for design and followed through for procurcrent and installation.
Yours very truly, 6
- 11PH/laf 8006120[g SEP 131373
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MEMO ROUTE SLIP Form AEC-95 (Rev. May 14,1947) AECM 0240 5*********-
For <*cu"*aca-N act8a-f Ne4 and return.
For signature.
For informa tion.
TO (Name and unst) 4N6 f1ALS RtMAAKS RO Chief, FS&EB Consumers Power Company RO:HQ (4)
Licensing (4)
Midland Units 1 & 2 un 50-329 and 50-330 DR Central Files Region I TO (Name and untt)
IMif1AL3 REM AAKS Regior II PDR Local PDR un NSIC DTIE TO (Name and untt)
(MITIALS RimeAAK5 R. Callen, MPSC Dr. W. E. North
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OGC, Beth, P-506A un FRoM (Name and unst)
RguaAns W. E. Vetter Attached is a copy of applicant's adequate reply dtd 9-10-73 RO:III to RO Bulletin 73-2.
"F6-74 USE OTHER SiOC FQA ACDITOMAL REMARKS cpo, negg o.,gs.ess O
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