ML20086D818: Difference between revisions

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=Text=
=Text=
{{#Wiki_filter:._        _ . _ _ . _ . . _ _
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                                                  &/                                       J l
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i NSP                                                                                                l l                                         NORTHERN               STATES POWER                       COMPANY M IN N E A PO L.a s. M IN N E SOTA S S401 June 7, 1976                                                                                                                             - x
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l NORTHERN STATES POWER COMPANY M IN N E A PO L.a s. M IN N E SOTA S S401 June 7, 1976
                                                                                                                                          '*    D Dj[5         ..    ,
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Mr Victor Stello, Director Division of Operating Reactors                                                                    i~h % jJg. y, T .
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U S Nuclear Regulatory Commission                                                                  (y';3 i
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Washington, DC                         20555                                                                                                     '
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Mr Victor Stello, Director i~h % jJg. y, T.
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U S Nuclear Regulatory Commission
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==Dear Mr Stello:==
==Dear Mr Stello:==
 
MONTICELLO NUCLEAR GENERATING PLANT Docket No. 50-263 License No. DPR-22 I
                                                                                                                                          'Q@,
Response to 5/20/76 Inquiry Concerning LPCI Design
MONTICELLO NUCLEAR GENERATING PLANT Docket No. 50-263 License No. DPR-22 Response to 5/20/76 Inquiry Concerning                                                                               I LPCI Design
)
                                                                                                                                                                        )
i Your {{letter dated|date=May 20, 1976|text=May 20, 1976 letter}} identified a potential design deficiency related to LPCI pump cavitation and motor overload. Monticello has the Loop Selection Logic System and does not have the LPCI modification. Therefore, item a j
i Your {{letter dated|date=May 20, 1976|text=May 20, 1976 letter}} identified a potential design deficiency related to LPCI pump cavitation and motor overload. Monticello has the Loop Selection Logic System and does not have the LPCI modification. Therefore, item a                                                                                       j of your letter is applicable and item b .is not.
of your letter is applicable and item b.is not.
The Monticello piping layout and pump data have been reviewed. At runout
The Monticello piping layout and pump data have been reviewed. At runout
[       flow the NPSH requirements of the pump are met. The pump characteristic l     curves show that at high flows, the brake horsepower and motor current de-A crease.                         Therefore, the Monticello LPCI pumps are not subject to damage due
[
flow the NPSH requirements of the pump are met.
The pump characteristic l
curves show that at high flows, the brake horsepower and motor current de-A crease.
Therefore, the Monticello LPCI pumps are not subject to damage due to cavitation or motor overload in the runout condition.
(
(
to cavitation or motor overload in the runout condition.
Yours Very truly, L 0 Mayer, PE bb1 Manager, Nuclear Support Services LQ4/MHV/ deb cc: J G Keppler C Charnoff i
Yours Very truly, L 0 Mayer, PE Manager, Nuclear Support Services bb1 LQ4/MHV/ deb cc: J G Keppler C Charnoff                                                                                                                                             i MPCA                                                                                                                                                   I Attn:                 J W Ferman 8312050151 780426 PDR ADOCK 05000263 g                                       PDR COPY SENT REGION         A_
MPCA I
                  - _ _ _ _ _ _ _ _ _ _            _    _.    ._.}}
Attn:
J W Ferman 8312050151 780426 PDR ADOCK 05000263 g
PDR COPY SENT REGION A_
._.}}

Latest revision as of 02:24, 14 December 2024

Responds to 760520 Inquiry Re Potential Design Deficiency Concerning LPCI Pump Cavitation & Motor Overload.Pumps Not Subj to Damage Due to Cavitation or Motor Overload in Runout Condition
ML20086D818
Person / Time
Site: Monticello, 05000000
Issue date: 06/07/1976
From: Mayer L
NORTHERN STATES POWER CO.
To: Stello V
NRC OFFICE OF INSPECTION & ENFORCEMENT (IE)
Shared Package
ML19289B550 List:
References
NUDOCS 8312050151
Download: ML20086D818 (1)
v • d • e


Text

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NSP l

l i

l NORTHERN STATES POWER COMPANY M IN N E A PO L.a s. M IN N E SOTA S S401 June 7, 1976

- x

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D Dj[5

,.; ~,

Mr Victor Stello, Director i~h % jJg. y, T.

Division of Operating Reactors (y';3 cu, ;.,7;f

'(

U S Nuclear Regulatory Commission

,?/

i Washington, DC 20555

1.,,,

s

'Q@,

Dear Mr Stello:

MONTICELLO NUCLEAR GENERATING PLANT Docket No. 50-263 License No. DPR-22 I

Response to 5/20/76 Inquiry Concerning LPCI Design

)

i Your May 20, 1976 letter identified a potential design deficiency related to LPCI pump cavitation and motor overload. Monticello has the Loop Selection Logic System and does not have the LPCI modification. Therefore, item a j

of your letter is applicable and item b.is not.

The Monticello piping layout and pump data have been reviewed. At runout

[

flow the NPSH requirements of the pump are met.

The pump characteristic l

curves show that at high flows, the brake horsepower and motor current de-A crease.

Therefore, the Monticello LPCI pumps are not subject to damage due to cavitation or motor overload in the runout condition.

(

Yours Very truly, L 0 Mayer, PE bb1 Manager, Nuclear Support Services LQ4/MHV/ deb cc: J G Keppler C Charnoff i

MPCA I

Attn:

J W Ferman 8312050151 780426 PDR ADOCK 05000263 g

PDR COPY SENT REGION A_

._.

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