ML20058H085
| 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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.9, Donald C. Shelton 300 Madison Avenue Vee President Nuciser 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-Subj ec t :
Supplemental Response to NRC Generic Letter 89210, " Safety-Relate'd
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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'
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operations, Toledo Edison vill not: meet'the' recommended schedule. Toledo Edison estimates it vill complete'in-situ M0V.-te' ting-at design basis s
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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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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