ML20105B530

Application for Amend to License NPF-12,revising TS SR 4.7.1.2 Re Emergency Feedwater Pumps to Provide Conservative Pump Discharge Pressure for Verifying Operability of Each motor-driven Emergency Feedwater Pump

ML20105B530
Person / Time
Site:	Summer
Issue date:	09/08/1992
From:	Skolds J SOUTH CAROLINA ELECTRIC & GAS CO.
To:	George Wunder NRC OFFICE OF INFORMATION RESOURCES MANAGEMENT (IRM)
Shared Package
ML20105B531	List: ML20105B530 ML20105B535
References
NUDOCS 9209210009
Download: ML20105B530 (2)

Text

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South C:rolina Etxctric & G2s Company John L Skolds P.O Box B6 Vice President

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Jenkinsville, sC 29065 (803) M'.4040 Nuclear Operations

.SCE&G m .n September 8, 1992 Document Control Desk U. S. Nuclear Regulatory Commission Washington, DC 20555 Attention: Mr. G. F. Wunder Gentlemen:

Subject:

VIRGIL C. SUMMER NUCLEAR STATION (VCSNS)

DOCKET NO. 50/395 OPERATING LICENSE NO. NPF-12 TECHNICAL SPECIFICATION CHANGE - TSP 880011 EMERGENCY FEEDWATER SYSTEM In accordance with 10CFR50.90, South Carolina Electric & Gas Company (SCE&G) is submitting an amendment request to License NPF-12 to change the Technical Specifications (TS) for VCSNS. The proposed change is a revision to the Surveillan;e Requirements (Section 4.7.1.2) for the Emergency Feedwater (EFW) pumps.

The main purpose of this change is to provide a conservative pump discharge pressure for varifying operability of each motor driven EFW pump. During an evaluation of the EFW flow requirenents, SCE&G found that current technical specification requirement (11350 psig at 190 gpm) needed to- be adjusted to 11555 psig at 190 gpm to ensure that a single motor driven EFW pump can deliver a minimum of 380 gpm to two steam generators. The surveillance test procedure was then changed to reflect this new test pressure. This new test pressure was met by the individual motor drive pumps, which have historically performed well beyond this test pressure at a recirculation flow 190 gpm. A subsequent analysis of the impact of the Emergency Diesel Generator (EDG) voltage tolerance and its frequency limitation to !1% indicated that the pumps should be tested at 1600 psig and 190 gpm.

The proposed change increases the minimum surveillance disch&,ge pressu u of the motor driven EFW pumps to ensure that the pumps are capable of delivering the design basis flow to two steam generators, accounting for recirculation flow, and the effect'of EDG tolerances for voltage and frequency on the pump performance. This change is consistent with VCSNS's EFW pump testing data accumulated since the beginning of commercial operation.

The amendment request is contained in the following enclosures:

Enclosure 1 Proposed TS Cha,1ge Enclosure 2 Description and Safety Evaluation Enclosure 3 Determination of No Significant Hazards Consideration 9209210009 DR 9po99g ADOCK 05000395 PDR

1 Document Control Desk ,

TSP 880011 Page 2 of 2 The proposed TS change has been reviewed and approved by the Plant Safety Review Committee and the Nuclear Safety Review Committee.

I declare that the statements and matters set forth herein are true and correct to the best of my knowledge, information, and belief.

Should you have any questions concerning this issue, please call Mr. Manuel W. Gutierrez at (803) 345-4392 at your convenience.

Very truly yours, John L. Skolds MWG:lcd Enclosures c: 0. W. Dixon J'r.

R. R. Mahan _

R. J., White ^

S. D. Ebneter-G. F. Wunder Genere.1 Managers NRC Resident Inspector J.-B. Knotts Jr.

H. G. Shealy RTS (TSP 880011)

File (813.20)

NUCLEAR EXCELLENCE - A SUMMER' TRADITION!

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