ML19312B647
| ML19312B647 | |
| Person / Time | |
|---|---|
| Site: | North Anna  |
| Issue date: | 10/18/1979 |
| From: | Parr O Office of Nuclear Reactor Regulation |
| To: | Proffitt W VIRGINIA POWER (VIRGINIA ELECTRIC & POWER CO.) |
| References | |
| NUDOCS 7911050021 | |
| Download: ML19312B647 (5) | |
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' DISTRIBUTION:
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Local PDR RHartfield UCT.c 1979 Docket File ELD LWR #3 File IE (3)
DVassallo WRussell Dross SVarga bec:
FWilliams JBuchanan, NSIC Cocket I:o: 50-330 OPa rr TAbernathy, TIC ADromerick ACRS (16)
Fr. W. L. Proffitt MRushbrook (w/ extra copies)
Senior Vice President'- Pct.er RMattson Operations
.SHanauer Virginia Electric & Pover Company JKnight P. O. Ecx 26666 RTedesco Rictr.cnd Virginia 23261 RDeYoung VMoore Lear it. Proffitt:
MErnst SLNECT: E.9VIRCtFEI.TAL (UALIFICATIO!! 0F REACTrR CCCLAf.T T:.'<FEF).TURE DETECTCRS Afic C0hTAItJ'EiiT FP. ESSURE TFAidS.9ITTERS The envircrcental cualificaticn for certain Westinchcuse-supplied instrur.entation is described in WCAP-9157 "Envircreental Cualification of Safety Pelated Class IE Prccess Instrumentaticn." Your application fer c license to crerate the fiarth Anna Plant references hCAP-9157 as a basis for the acceptance cf the envircr-r.: ental cualification of this instrumentation. The regulatcry staff has found that additional infomation is needed tc cm;plete its review of '.iCAP-9157.
Westinghcuse Electric Corporation has agreec to provice the requested inferration in a timely nanner except for three areas: (1) the qualified life of resistance temperature detectors ~(RTDs) to be used to measure the temperature of reactor coolant; (2) cualification of field cennecticns for these ter cerature detectors; (3) qualification of rencte tellows sensing pressure transmitters to be used to rceasure pressure of the ccntaircent atmosphere. Acceptable infomation for these three areas uust be provided for our review and approval prior to the issuance of a license to operate your plant. Since resciuticn of these ratters may not be completed with hestinghouse within the recaining licensing review schedule estimated for ycur plant, we will recuire that resciutica of the staff's corcerrt statea belcw be completed on your application.
The hestinghouse evaluation of the qualified life of the resistance temperature cetectors (Section 2.2 cf WCAP-9157) is unacceptable because the assumed post-accident fission precuct scurce term is too small and the assumed post-accident operating time is too short. Guidelines for calculating acceptable qualified life in a radiation environment follow.
A.
The tctal integrated exposure to be simulatec in cualification tests st.culc be the sum of the calculated integrated exposure during normal plant opera-tion and the calculatec integrated exposure curing post-accident plant operation.
S.
The fission credtet source term for calculatira exrcsure curinc Ocst-acticent werar. ion soeu, e ccrrespenc
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Post-accicent expcsure for P.TCs should be based en the higher of tt.o exposures calculatec by asst.uing (1) an instantanecus release of fission products frcm the fuel to the containment atmosphere, anc (2) an instantaneous release frcm the fuel to the reactor coolant without subsecuent release to the containcent.
D.
Post-accident operation tice for the narrow-range resistance temperature detectors should be the sum of the longest time required for reactor trip in any anticipated operational cccurrence or design basis accident plus a margin of one hcur for uncertainties in predicting the tice.
E.
Post-accident operation time for the wide-range resistance teaperature detectors should ccnsider the enviromental conditions for an interval cf 1C0 cays fellowing the accident, unless a shcrter time can be justified.
(Since the post-accident operation time used in cualification tests described in 'e. CAP-3157 is less than 100 days, you should prcvide justification to show that extencing the test to 100 cays would not significantly affect instrument perfcmance or accuracy fnr this pericc).
ACAP-9157 cces not incluce qualification of electrical ccnnections used in the installation of resistance tanperature detectors because these field connections are not cade by ',.estinghcuse. Justification for your corclusion that field cornections will perfom acceptably in the post-accident envirement is needed.
The qualification test of the rer.cte belicts sensing pressure transmitter resulted in an ancmalous pressure spike above the test char;ter pressure (Secticn 5-6 of WCAP-915 7 ). The test results are unacceptable to the staff because the indicated pressure cces not meet the acceptance criteria for instrts:ent accuracy and ancnalces indications,. such as the pressure spike, are centrary to the recuirements of Secti 4 cf IEEE-279-1971, "IEEE Criteria for Protection Systens for."uclear Power Cenera-ting Stations."
It is ccncluded in WCAP-9157 that this pressure scike is attribut-acle to the smallness cf the test chacber and that the spike wculd not cccur in the large containment. The discussicn in WCAP-9157 cf the cause of the pressure spike in the test and the assurance of its absence in the plant is inacecuate. Adciticnal tests or analyses are needed to demonstrate that this pressure transmitter is acceptable.
Please amend your'applicaticn to provide the folickinc acditional infomation.
1.
Results of calculations using the guidelines in this letter to detemine aCCeCtable qualified life of resistance temperature detectors to be used to measure reactor coolant tenperature.
2.
Results of tests or analyses to decenstrate acceptable envirenrectal cualificatior j of fielc connecticns for resistance temperature detectors to be usec to reasure reacter ccclant temperature.
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I f.r.". L. Proffitt OL'. _ s 10/9 2.
C,esults of tests or analyses, in addition tc those in 'aCAP-9157, to darcestrate acceptable envirorr. ental cualification of pressure transmitters to_ be used to r,iedsure cor.taincent pressure.
This infcrmation is needed by Octcber 25 in order to neet our schedule for review and approval of your application for an operating license.
If you cannot teet this date, please inform us within two weeks from the date of receipt of this letter of a date you will sutmit the requested information. If you desire clari -
fication of the technical infonration requested in this ictter please call Tom Cunning on (301) 402-7383.
Sincerely, oririml :i;ned D7 A. W. Drc=ericjs Glan D. Parr, Chief Light Water P.eacters Branch !'o. 3 Civision of Project Panagert.ent cc:
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Mr. W. L. Proffitt cc: Mr. Anthony Cambaradella Cl arence T. Ki pps, Jr., Es q.
Office of the Attorney General 1700 Pennsyl vania k.ea.e, N.W.
11 South 12th Street - Room 308 Washington,D. C.
20LJ6 Richmond, Virginia 23219 Carroll J. Savage, Esq.
Richard M. Foster, Esq.
1700 Pennsylvania Avenue, N.W.
211 Stribling Avenue Washington, D. C.
20006 i
Charlottesville, Virginia 22903 Mr. James C. Dunstan Michael W. Maupin, Esq.
State Corporation Comnission Hunton, Williams, Gay & Gibson Ccamonvealth of Virginia P. O. Box 1535 Blandon Building Richmond, Virginia 23212 Richmond, Vi rginia 23209 Mrs. June Allen Alan S. Rosenthal, Esq.
412 Owens Drive Atomic Safety and Licensing Appeal Board Huntsville, Alabama 35801 U.S. Nuclear Regulatory Commission Washington,D. C.
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Socorro, New Mexico 87801 Atomic Safety and Licensing Appeal Ecard U.S. Nuclear Regulatory Commission Mrs. Margaret Dietrich Washington, D. C.
20555 3
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U.S. Nuclear Regulatory Comaission Georgetovo Un.iversity Law Center Washington, D. C.
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Washington, D. C.
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20555 Executive Vice President Sun Shipping & Dry Dock Company Mr. Michael S. Kidd P. O. Box 540 U.S. Nuclear Regulatory Comnission Chester, Pennsylvania 19013 P. O. Box 12S Spotsivania, Virginia 22553 Mr. R. 8. Briggs Associate Director Dr. Paul W. Purdom 110 Evans Lane Department of Civil Engineering Oak Ridge, Tenaessee 37830 Drexel University Philadel phia, Pennsyl vania 19104 I
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5 Mr. W. L. Proffitt cc:
Dr. Lawrence R. Quarles Apartment No. 51 Kendal-at-Longwood Kennett Square, Pennsylvania 19348 Mr. Irwin B. Kroot Citizens Energy Forum P. O. Box 138 McLean, Virginia 22101 Janes B. Doughe.rty, Esq.
Potomac Alliance 1416 S Street, N.W.
Washington, D. C.
20009
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