ML17037B544
| ML17037B544 | |
| Person / Time | |
|---|---|
| Site: | Nine Mile Point  |
| Issue date: | 07/23/1976 |
| From: | Rhode G Niagara Mohawk Power Corp |
| To: | Lear G Office of Nuclear Reactor Regulation |
| References | |
| Download: ML17037B544 (4) | |
Text
NliC FoBM 195 U.S. NUCLLABREGULATORYCOM'ION I2 VS)
NRC D(STRIBUTION FoB ipse,RT 60 DOCI(ET MATERIAL DOCKET NUMBER 50-220 FILE NUMIIER Mr, George Lear FROM:
Niagara Mohawk Power Corp.
- Syracuse, New York Mrs Gerald K. Rhode DATE OF DOCUMENT 7/23/76 DATL-RECEIVED 7/26/76
/%LETTER
'foBIGINAL G COPY DCSCBIPTION QNOTORIZED j8VNCLASSIFIE D PROP INPUT FORM ENCLOSURE NUMI3EB OF COPIES RECLIVED One signed copy t
Ltr, concerning the reanalyzing of the torus support. structure
& internals during the cours of the Mark I Containment Short Term Program.
PLANT NAME:
Nine Mile. Point 41 (i-P)
~ACKNQPPZEDGgD
>0 NOT RZtWVZ SAFETY ASSIGNED AD:
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PROJECT IIANAGER:
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Lear Paxrish FOR ACTION/INFORMATION PROIE
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EN REACTOR SAFE'11Y ROSS NOVAK ROSZTOCZY CHECK AT & I SALTZIIAN RUT13ERG EXTERNAL DISTRIBUTION NAT I~Cd:
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NIAGARAMOHAWKPOWER CORPORATION NIAGARA MOHAWK 300 ERIK BOULEVARD WEST SYRACUSE. IV. Y. I3202 Regulatory Docket RCe Director of Nuclear Reactor Regulation Attn:
Mr. George Lear, Chief Operating Reactors Branch 03 U. S. Nuclear Regulatory Commission Washington, D. C.
20555 July 23, 1976 I ( I.~
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Re:
Nine Mile Point Unit 1 Docket No. 50-220 DPR-63
'ear Mr. Lear:
Duiing the course of the Mark I Containment Short Term
- Program, the torus, support structure and internals at Nine Mile Point Unit 1 were reanalyzed.
As a result, it has been found that the solid catwalk's structural capability could conceivably be exceeded due to the pool swell load for the postulated worst-case loss-of-coolant accident.
However, for the most probable impact orientations and areas, containment integri ty would be maintained.
Consequently, the solid catwalk will be removed and replaced with a grating catwalk to alleviate this situation during the scheduled
- Spring, 1977 refueling outage.
We believe the substantial financial impact resulting from an earlier shutdown to make these modifications not to be warranted in light of the extremely remote possibility for occurrence of the postulated worst-case loss-of'-
coolant event during this interim period.
Very truly yours, NIAGARA MOHAWK POWER CORPORATION ERALD K.
HODE Vice Pre ident
gineering
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