ML20213F930
| ML20213F930 | |
| Person / Time | |
|---|---|
| Site: | Prairie Island  |
| Issue date: | 11/11/1986 |
| From: | Larson C NORTHERN STATES POWER CO. |
| To: | James Keppler NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION III) |
| References | |
| IEB-86-003, IEB-86-3, NUDOCS 8611170252 | |
| Download: ML20213F930 (3) | |
Text
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Northern States Power Company 414 Nicollet Mall Minneapoks. Minnesota 55401 Telephone (612) 330-5500
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l r vember 11, 1986
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i Mr James G Keppler Regional Administrator - Region III U S Nuclear Regulatory Commission 799 Roosevelt Road Glen Ellyn, IL 60137 PRAIRIE ISLAND NUCLEAR GENERATING PLANT Docket Nos. 50-282 License Nos. DPR-42 50-306 DPR-60 Response to IE Bulletin 86-03 In response to IE Bulletin 86-03, " Potential Failure of Multiple ECCS Pumps Due to Single F ilure of Air-Operated Valve in Minimum Flow Recirculation Line", the problem described therein does not exist at this facility for the following reasons; 1.
Each Residual Heat Removal Pump (low head safety injection pump) has its own recirculation line with a manual valve.
2.
The (high head) Safety Injection (SI) pumps have a common recirculation header with two motor-operated valves in series.
Since these motor-operated valves fail in position, General Design Criteria 35 is met.
In addition:
The valves have position indication independent of the motor operator power supply.
l Low recirculation flow is annunciated in the control room.
The SI pumps can run at least ten minutes with no recirculation flow w.thout damage.
Automatic safety injection actuation occurs at 1815 psig, well below the SI pumps shutoff head of 2170 psig.
(Ell
@611170252 861111 R
ADOCK 05000282 PDR
Mr J G Keppler Northem States Power Company November 11, 1986 Page 2 Modifications that would disable the SI pump recirculation valves in the open position were considered. Our evaluation shows that the valves should not be blocked in this manner.
e C E Lars Vice President, Nuclear Generation CEL/EFE/efe c: NRR Project Manager, NRC Resident Inspector, NRC
-Document Control Desk, NRC G Charnoff
UNITED STATES NUCLEAR REGULATORY COMMISSION NORTHERN STATES POWER COMPANY PRAIRIE ISLAND NUCLEAR GENERATING PLANT Docket No. 50-282 50-306 RESPONSE TO IE BULLETIN 86-03 Northern States Power Company, a Minnesota corporation, by this letter dated November 11, 1986 hereby submits the response to IE Bulletin 86-03 for the Prairie Island Nuclear Generating Plant.
This letter contains no restricted or other defense information.
NORTHERN STATES POWER COMPANY P
By
[M C E Lars Vice Pres
, Nuclear Generation on this
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day of bAJ, /vfd before me a notary public in and for said County, personally appeared C E Larson, Vice President, Nuclear Generation, and being first duly sworn acknowledged that he is authorized to execute this document on behalf of Northern States Power Company, that he knows the contents thereof and that to the best of his knowledge, information and belief, the state-ments made in it are true and that it is not interposed for delay.
3-e/u A &r >
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l DODY A. BROSE NOTARY PUBLtC - MINNE$oTA :
ll HENNEPIN COUNTY My Commission Empires Dec. 20.1989 ) ;
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