05000220/LER-1997-015, Informs NRC That Util Is Retracting LER 97-015, Potential Bypass Leakage Path Between Drywell & Torus During Vent & Purge, Which Had Been Reported IAW 10CFR50.73(a)(2)(v)(D). Leakage Path Would Not Have Prevented Plant Function

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Informs NRC That Util Is Retracting LER 97-015, Potential Bypass Leakage Path Between Drywell & Torus During Vent & Purge, Which Had Been Reported IAW 10CFR50.73(a)(2)(v)(D). Leakage Path Would Not Have Prevented Plant Functions
ML20217R042
Person / Time
Site: Nine Mile Point Constellation icon.png
Issue date: 05/01/1998
From: Rich Smith
NIAGARA MOHAWK POWER CORP.
To:
NRC OFFICE OF INFORMATION RESOURCES MANAGEMENT (IRM)
References
NMP1L-1313, NUDOCS 9805130131
Download: ML20217R042 (1)


LER-2097-015, Informs NRC That Util Is Retracting LER 97-015, Potential Bypass Leakage Path Between Drywell & Torus During Vent & Purge, Which Had Been Reported IAW 10CFR50.73(a)(2)(v)(D). Leakage Path Would Not Have Prevented Plant Functions
Event date:
Report date:
2202097015R00 - NRC Website

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NIAGARI MOHAWK l G E N E R ATIO N M M MR MW MNEAKE ROAD. P.O. BOX 63, LYCOMING, NEW YORK 13003 l BUSINESS GROUP l

)

May 1,1998 NMPIL 1313 U.S. Nuclear Regulatory Commission Attn: Document Control Desk Washington, DC 20555 l

RE: LER 97-15 Docket No. 50-220 Gentlemen:

This letter is to inform the NRC that Niagara Mohawk Power Corporation (NMPC) is retracting LER 97-15, " Potential Bypass Leakage Path Between Drywell and Torus During Vent and Purge" which had been reported in accordance with 10CFR50.73(a)(2)(v)(D), "Any event or condition that alone could have prevented the fulfillment of the safety functions of

, structures or systems that are needed to: (D) Mitigate the consequences of an accident." <

I After completing analysis described in corrective action 3 of the original LER, it was determined that the potential leakage path during vent and purge would not have prevented the Nine Mile Point Unit 1 (NMP1) primary containment from performing its accident safety functions as described in the NMP1 Updated Final Safety Analysis Report (UFSAR).

Specifically, the results are that the peak torus pressure would have been 24 psig, which is

. well below the design pressure of 35 psig. Therefore, the event is not reportable.

l Very truly yours, l Robert G. Smith Plant Manager - NMP1 RGS/GJG/ kap xc: Mr. H. J. Miller, Regional Administrator, Region I Mr. S. S. Bajwa, Director, Project Directorate I-1, NRR gy Mr. B. S. Norris, Senior Resident Inspector g'k Mr. D. S. Hood, Senior Project Manager, NRR Records Management h

9905130131 990501 PDR ADOCK 05000220*

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