ML20084U351

Clarifies Response to Generic Ltr 82-33 & Suppl 1 to NUREG-0737 on Requirements for Emergency Response Capability Re Discrepancy Noted During Region III Insp of Implementation of Reg Guide 1.97

ML20084U351
Person / Time
Site:	Prairie Island
Issue date:	04/10/1991
From:	Parker T NORTHERN STATES POWER CO.
To:	NRC OFFICE OF INFORMATION RESOURCES MANAGEMENT (IRM), Office of Nuclear Reactor Regulation
References
RTR-NUREG-0737, RTR-REGGD-01.097 GL-82-33, NUDOCS 9104170186
Download: ML20084U351 (1)

Text

1 Northem States Power Company 414 Nicollet Mall Hinneapoks, Minnesota f64011927 TelepNne t6ih 33at$00 April 10, 1991 Ocneric Letter 82 33 Mmtor of Nuclear Reactor Regulation 0 $ fNelear Regulatory Commission

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Document Control Desk i'u.bh gton, DC 20555 PRAIRIE ISLAND NUCLEAR GENERATING P! ANT Docket Nos. 50-282 License Nos. DPR 42

$0 306 DPR 60 Clarification of Response to Generic Letter 82 33 Sopolement 1 to NUREC 0737 - Reauirements For Emergency Resmonse Cnp3bility This letter is provided to update our response to Generic Letter 82 33,

" Supplement 1 to NUREC 0737 Requirements For Emergency Response capability",

with respect to a discrepancy identified during an NRC Region III Inspection at Prairie Island on the imple. mentation of Regulatory Guide 1.97.

On page 11 of Table 1 in our response to Generic Letter 82 33, dated September 15, 1983, we committed to install containment sump water level instrumentation with a range of 0 to 12 feet.

This instrumentation was installed in the Unit 2 containment with the committed range.

However, due to physical constraints in the Unit 1 Containment Building we were unable to install the containment sump water level instrumentation with the full 0 to 12 foot range.

The range of the containment sump water level instrumentation installed in the Unit 1 containment is 0 to 11 feet 6 inches.

Based on the maximum containment water level anticipated as a result of a large break LDCA, approximately 6 feet 6 inches, the slightly reduced range of the containment sump water level instrumentation does not affect the safe operation of Prairie Island Unit 1.

We apologize for any inconvenience this discrepancy may have caused.

Please contact us if you have any questions related to Prairie Island containment sump water vel instrumentation.

• s Thomas H Parker Manager Nuclear Support Services s

c: Regional Administrator Region III, NRC Senior Resident Inspector, NRC NRR Project Manager, NRC J E Silberg QO 9104170186 910410 l' Q

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