ML17251A369

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Special Rept:On 881018,turbine Driven Auxiliary Feedwater Pump Inoperable Per Procedure A-52.4.Existing Check Valve Leakage Indicated by Higher than Ambient Temp in Turbine Driven Auxiliary Feedwater Discharge Piping
ML17251A369
Person / Time
Site: Ginna Constellation icon.png
Issue date: 11/23/1988
From: Mecredy R
ROCHESTER GAS & ELECTRIC CORP.
To: Russell W
NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION I)
References
NUDOCS 8811300527
Download: ML17251A369 (4)


Text

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~i..ACCELERATED DISTRIBUTION DEMONSTRION SYSTEM REGUDATORY INFORMATION DISTRIBUTION SYSTEM (RIDE)

ACCESSION NBR-8811300527 DOC.DATE: 88/11/23 NOTARIZED: NO FACIL:50-244 Robert Emmet Ginna Nuclear plant, Unit 1, Rochester G

AUTH.NAME AUTHOR AFFILIATION MECREEDY,R.C.

Rochester Gas

& Electric Corp.

RECIP.NAME RECIPIENT AFFILIATION RUSSELL,W.T.

Region 1, Ofc of the Director SUMECT: Special rept:on 881018,turbine driven auxiliary feedwater pump inoperability.

DISTRIBUTION CODE:

IE22D COPIES RECEIVED:LTR ENCL SIZE:

TITLE: 50.73 Licensee Event Report (LER), Incident Rpt, etc.

NOTES:License Exp date in accordance with 10CFR2,2.109(9/19/72);

DOCKET 05000244 05000244 D RECIPIENT ID CODE/NAME PD1-3 LA STAHLE,C INTERNAL: ACRS MICHELSON ACRG WYLIE AEOD/DSP/TPAB ARM/DCTS/DAB NRR/DEST/ADS 7E NRR/DEST/ESB 8D NRR/DEST/MEB 9H NRR/DEST/PSB 8D NRR/DEST/SGB 8D NRR/DLPQ/QAB 10 NRR/DREP/RAB 10 NRR S/SIB 9A G

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NVZE IO ALL RIDS" RECIPIENTS' PZZASE HELP US TO REHJCE WASTE!

CXRZACZ 'IHE DOQ3MERZ CCKEKL DESK ROOM P1-37 (EZV. 20079)

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November 23, 1988 Mr. William T. Russell, Regional Administrator U.S. Nuclear Regulatory Commission Region 1

475 Allendale. Road King of Prussia, PA 19406 Subj ect:

Thirty (30)

Day Special Report Turbine Driven Auxiliary Feedvater Pump Inoperability R.E.

Ginna Nuclear Pover Plant Docket No. 50-244

Dear Mr. Russell:

Ginna St'ation s Technical Specification Section 3.4.2b requires.that a thirty (30) day special report be submitted if one auxiliary feedwater pump or flow path is inoperable for more than seven days.

On October 18,

1988, the Turbine Driven Auxiliary Feedvater System vas declared inoperable per procedure A-52.4, "Control of Limiting Conditions for Operating Equipment".

A Nonconformance Report identified that the discharge line check valves had not received reverse closure testing for back leakage as specified by ASME Section XI; In addition, apparent existing check valye leakage vas indicated 'by higher than ambient temperatures in the Turbine Driven Auxiliary Feedwater (TDAFV) discharge piping upstream from the check valves.

Check valves CV-4003 and CV-4004 provide the barrier to prevent. feedwater from feeding into the turbine driven auxiliary feedvater pump (TDAFVP) discharge lines from the respecti ve A/B steam generators.

They also provide a barrier to prevent cross flov condition from occurri ng between steam generators in the event of a pressure imbal ance.

Valves CV-4003 and CV-4004 are three (3) inch 900 pound Crane-Chapman tilting disc check valves installed during original plant construction.

QS 1 CK 0 000244

. 1300527 881123 PDR PDC

Page 2

TDASÃ Pump Inope ability November 23, 1988 Declaring the TDAFV System inoperable was taken as a precau-tionary measure due to the inability to immediately quantify the existing back leakage.

Corrective action is progressing along two parallel paths.

An analysis will be performed to determine acceptable back leakage limits, assuring that ASME Section XI acceptance criteria of "no gross leakage",

and accident analysis assumptions are met.

The Maintenance Department is taking steps to ensure valve back leakage is minimized by ordering and installing new seat and disc assemblies or by installing refurbished seat and disc assemblies as removed from the respective valves.

A RG&E qualified valve maintenance contractor is performing the refurbishment as well as fabricating a valve seat closure test device for testing seat leakage at a variety of test pressures in order to determine closure integrity over a range of system operating pressures.

The test devi ce will be utilized to assess the "as found" condition of the presently installed seat/disc assemblies.

In the interim, the TDAFV system is isolated with the manual valves MV-4005 and MV-4006, located downstream of the suspect check valves.

'I Should sy tern-operation be required as a result of a blackout condition, Procedure ECA-0. 0, "Loss of all A. C. ",

as wr'itten addresses the establishment of auxiliary feedwater flow to the required steam generator (s).

During operation of the pump in this condi tion, the header is

charged, and
thus, the backflow condition is not a concern.

The turbine driven auxiliary feedwater pump system is anticipated to be made fully operable by December 20, 2988.

Very truly yo c7

~~'eet7redy General Manager Electri c Production xc:

U.S. Nuclear Regulatory Commission (Original)

Document Control Desk 8'ashi ngton, D. C. 20555

, xc:

Ginna Senior Resident Inspector