ML20058H085

Suppls 900105 Response to Generic Ltr 89-10, Safety-Related Motor-Operated Valve Testing & Surveillance

ML20058H085
Person / Time
Site:	Davis Besse
Issue date:	11/06/1990
From:	Shelton D CENTERIOR ENERGY
To:	NRC OFFICE OF INFORMATION RESOURCES MANAGEMENT (IRM)
References
1870, GL-89-10, TAC-M75654, NUDOCS 9011140228
Download: ML20058H085 (2)

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m; .9, Donald C. Shelton Vee President Nuciser 300 Madison Avenue Toledo, OH 4365M001 =

DevbBesse (419)249 2300 Docket Number 50-3*6 License Number NPF-3 Serial Number 1870 November 6, 1990 United States Nuclear Regulatory Commission Document Control-Desk Washington, D. C. 20555- '

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Subj ec t : Supplemental Response to NRC Generic Letter 89210, " Safety-Relate'd Motor-Operated Valve (MOV) Testing andLSurveillance"(TAC No.~ M75654)) ,

Gentlemen By letter dated January 5, 1990 (Serial Number 1748), Toledo' Edison submittAd.

its response to NRC Generic-Letter 89-10, whichLdescribed the~ testing. program-for safety-related MOVs at the Davis-Besse Nuclear: Power Station (DBNPS).,(In-a letter dated August 8, 1990-(Log Number'3300) pthe NRC staff < requested-that Toledo Edison provide an estimated

• schedule [for completion *of the-initial-~MOV testing program for the DBNPS; This letter provides,the requested information.

NRC Generic Letter 89-10, dated June 28, 1989,' recommendsithat the initial MOV; testing program be completed within 5 yearstor 3 refueling outages of,the'date of the generic letter. However, due to the expected scope'of in-situ design:

basis testing and difficulties in establishing the.necessary. plant conditions for full-flov and maximum' differential. pressure' testing during plant'

{ operations, Toledo Edison vill not: meet'the' recommended schedule. Toledo Edison estimates it vill complete'in-situ M0V.-te's ting-at design basis conditions prior to startup-from the 9th refueling; outage as specified below.

The 9th refueling outage is currently scheduled for;the FalliofJ1994.

It is noted that the above scheduled completion 1dat'e is based upon'the selection of an.MOV-test' population using the'following guidelines:

1. Design basis differential pressure:and. flow cannot be established during in-situ testing for some MOVs and prototype testing is not possible without' removing the MOVsifrom:the plant'4 .

Engineering analysis based? upon: ths. best; available test dataLvill' be -

.used-to determine.the required Avitch settings 3for!these'MOVs.

2..'All MOVs in' multiple-train < systems;with;identicalefunctions.that are-subject :to identical = design hasis' conditions: vill not:be tested at a <

idesign basis'flov.'and(differential: pressure'.-tin'many of these cases, Toledo Edison intends'to' test'only one MOVJfrom each setLof valves.

meeting this criterion.

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" Docket Nurb2r 50-346 e' Lic".nst-Numb 3r NPF-3 Serial Number 1870' Page 2

3. Design basis full-flow conditions for M9Vs used to isolate'line?

breaks cannot be duplicated during.in-situ testing. Engineering; analysis based.-upon the best available test r' 'a vill be.used to.

determine the required switch settings for tl a MOVs. , .

Toledo Edison vill continue to monitor industry-experience relating.to:the MOV>

test program and modify the program asinecessary based upon this information.':

Such program modifications will be communicated-to:the NRC staff as: applicable should they have a significant impact on.the above schedule.

Should you have any questions concerning~this matter,'please contact Mr. R. V.

Schrauder, Manager - Nuclear . Licensing, at l(419): 249-2366. , ,

Very truly yours,

~N NKP/mmb act P. M. Byron, DB-1 NRC Senior Resident Inspector A. B. Davis, Regional-Administrator,.NRC. Region III-M. D. Lynch, DB-1 Senior ~ Project Manager-Utility Radiological-Safety Board 1

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