ML20125A592
| ML20125A592 | |
| Person / Time | |
|---|---|
| Site: | Monticello  |
| Issue date: | 06/25/1973 |
| From: | Ziemann D US ATOMIC ENERGY COMMISSION (AEC) |
| To: | Mayer L NORTHERN STATES POWER CO. |
| References | |
| NUDOCS 9212080407 | |
| Download: ML20125A592 (4) | |
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JUN 2 51973 Dockat No. 50-263 Northern States Power Company ATTH: Mr. L. O. Mayer Director of Nucicar Support Services 414 Nicollet Hall Minneapolie, Minnesota $5401 Gentlemen We have reviewed your letter dat6d September 28, 1972, responding to our August 3,1972 inquiry regarding failure of engineered safet.y features due to flooding incidents such as the one that occurred at the Quad-Cities Unit 1 Hucicar Power Plant.
You reported that with reepect to major Class 11 piping systeme invectigationa vere continuing to identify seans of further reducing the potential for adverse interactions with essential equipment.
Please identify the results of this investigation and include your evaluation of the items listed in the enclosed " Guidelines for Pro-taction from Flooding of Equipment important to Safety" as they apply to the Montiesilo poclear Power Plant so that we may couplete our review. The supplementary information should be submitted withia M days. One signed original and thirty-nine additional copies of your submittals are required.
giacerely.
Original signed by Dennis L. Ziemann
- $ennis L. F.iemann, Otief Operating Reactors Branch f2
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Directorate of Licensing Enclosural
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Guidelines for Protection from Plooding of Equipment favortant to Safety i
9212080407 730625 PDR ADOCK 05000263 P
i 1-Mrthern States Power Company 4
esw/emaleeures Donald E. Malses, Esquise YF and OC Northera States Power CsapaaF Distribution 414 Nicollet Mall t tenet File Minneapolis, w#n===ata 55401 AEC PDR Local PDR Howard J. Vogel, Esquiro RP Reading Knittle & Vogol Branch Reading 814 Flour Exclango' Building JRBuchanan, ORNL IIir.nenpolic, Mintiesota 55415 DJSkovholt, L 0R TJCarter, L:0R Steve Gadler, F. E.
ACRS (16) 2120 Carter Avenue R0 (3)
St. Paul, Minnesota 55108 JGallo, OGC DLZiemann, L:0RB #2 Harriett Lansing, Roquire JJShea, L 0RB #2 Asnistaut City Attorney J1Riesland, L 0RB #2 City of St. l'aul RMDiggs, L 0RB #2 658 City gall St. Paul, Minnesota 5S102 Kan Dzugan Nf naamata Follution Control Agency 717 Delaware Street, S. E.
Minneapolis, Minnesots. 55440 Warren 1. Laween, M. D.
Secretary & Exacutive Officer State Department of Wealth 717 Delaware Street, 8. E.
Minneapolis, Minnesota 55440 Geraid Charmoif Shaw, Pittman, Fotts, Trowbridge & Wadden 910 - 17th Street, H. V.
Washington, D. C.
20006 Ravironmental Library of Minnanota 1222 8. E. 4th Stroet Minneapolis, Minnesota 54220 omet >
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I GUIDELINE 8 POR PROTSCTION Fa0W FIA00130 0F BQUIPMEff IMPORTANT 50 84FETT 1avestiente your fasility to assure that equipment tapertent te safety will ast be damaged by fleeding due to rupture of a men-Class I system eoapenent er pipe such that engineered safety features will tot perform their design functism. Me single imaident of a man-Class I system contement er pipe failure shall prevent safe shutdown of the facility, Your review should assure that the plants meet the fo11 ewing guidelines:
1.
Separation for redundancy - single failur of non-Class I system congonents or pipas shall not result in a system isportant to safety. Redundant safety eqsipment shal e separated and protected to assure operability in the event a non-Class I system or component fails.
2.
Accese doors and alarms - watertight barriers for protection from flooding of equipment important to safety shall have all access doors or hatches fitted with reliable switches and circuits that provide an slarm in the control room when the access is opea.
3.
Sealed water passages - passages or piping and other penetrations through walls of a room containing equipment isportant to safety shall be saaled against water leakass from any postulated failure of non-Class I water systems. The seals shall be designed for the SSE, including seismically induced wave action of water inside the affected eampartesat during the SSE.
4.
Class I watertight structures - walls, doors, panels, or other compartment closures designed to preteet equipment isportant to safety from damage due to flooding frem a non-Class I system rg ture shall be designed for the SSR, including seismically induced wave action of water 1maide the affected ecapartment during the 58E.
5.
Water level alarms and trips - rooms sentaining non-Class i system components and pipes.whose rupture could result in flood damage to equipment important to safety shall have level alarms sad pung trips (where necessary) that alarm in the control room and limit flooding to within the design flood volune. Rada=da=am of switches is required. Critical pump (i.e., high volume flow,
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such as condenser circulating water pumps) trip circuits should meet IEEE 279 ersteria.
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class I equiposat shem14 he leested er protested emah that rupture of a mem-class 1 ersten esemasted to a tower n"-8 *- water er body of water (river, lake, ete.) will met reem1t la failure of the etutposat iren fle+41r3 7.
The safety analysis aball ernsider stamitaneous less of offsite power with the rupture of a, nea-Class I systes esgonent or pipe.
Your responses should include a listing of the non-Class I systems
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considered in your analysis. N se should include at least the following systems:
Firewster Deniseralised Water Service water Drains Condensate R aating boiler condensate Feedwater Condensar circulating water 0
Reactor Building Cooling Water Makeup Turbine Building Cooling Water ystable water if your analysis identifies deficiencies, describe interin and final corrective action to be thkeu and provide a schedule for coupletism of any required modifications. All eerrective action should be een-plated as expeditiously as is practiemble.
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