ML20195E472
| ML20195E472 | |
| Person / Time | |
|---|---|
| Issue date: | 05/15/1979 |
| From: | Stolz J Office of Nuclear Reactor Regulation |
| To: | Anderson T WESTINGHOUSE ELECTRIC COMPANY, DIV OF CBS CORP. |
| Shared Package | |
| ML19297H224 | List: |
| References | |
| TAC-11299, NUDOCS 8811080092 | |
| Download: ML20195E472 (2) | |
Text
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.g 7., M MAY 151979 Distribution w/ enclosure:
D. liiggingten Dockes File
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L. L. Kintner
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r E. a. syiton E. Reeves.
J. F. Stolz.
A. Dromerick
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l.ocal PDR J. R. Buchanan,'NSIC 555E5 F.r. Thomes R. Anderson, F.anager D!R #1 File T. B. Abernathy, TIC a:ndl f:uclear Safety Ecpartrent D. B. Vassallo 5=.:M{
1:estinthouse Electric Corporation F. J. Hilliams 55:i!M P. O. Eox 255 IE (3)
'=~3 Pittsburgh, Pennsylvania 15230 A. 9 er-
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hEMEW OF REPORT El: TITLED 'QUALIFICATI0! CF EAP.TCH PRESSURE 3.q q.j Al:D DIFFEREi.'TI AL PRESSURE TRA!;SMITTERS" (FROPRIETARY) y i=mm;'
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We have comf,leted our review of the subject report transmitted by your letter f S-TPA-1950, dated September 29, 1972.
Our evaluation is enclosed.
.g=Me Until t;e take a forcal finding on your request to hold the subject report
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proprietary, the enclosure to this letter will be handled as proprietary
?,7.'2 ano is Leing withheld from public disclosure in acccrdance with 10 CFR
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2.790.
. := ~ a si=M The subject report describes qualification tests of Carten pressure
$5q2 and differential pressure transmitters.
The specified test sequence ar.d specified test conditions bcre selected to simulate a loss of
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.==r=e coolant accident er a steam line break.
The transn.itters are used
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to ceasure reactor coolant pressurizer level, pressuriztr pressure, and steam generator level.
These instru ents are used f $r automatic
".'.i.;. J actuation of the engineered safety features protection s.* stem inne-g.f~.;;3.i diately following an accident and also for monitoring rea-tor conditions m;:s. :.H as a basis for operator action during long term post-accitant cooling.
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Specified allouable instrtrent inaccuracies correspend to those used
==.T....:g in safety analyses of these accidents.
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0 "TU)y Results of qualifications tests at the specified test conditions and 0
..j.H.4 in th*e specified test sequence shomd that all pressure transmitters,
%.d except the Carton 7_6.3 narrow ranse trantnitter, neet the specified T ~ ~.j accuracies for_ initiation of protection sys. tem, actions, but the trans-
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mitters do not rect specified accuracies for operator actions during gj lont; terr post-accident cooling.
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725 fuf;lv.cr.tal tests..ere run ct less severe ccnditions of te: ferature anG a
raciatier. but still rcrresentative of accicert ccnditicrs.
Eespits
=S cf sugicetntal tests indicate the.t instrocnt accuracies are accertable a==,
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?ULC ]SC,;0Sgky-if the transuitters are exposed to:
(1) a loss of coolant accident environment in which the transnitter circuit bcards de not exceed a te:.:pegature of 200 degrees Fahrenheit and radiation dose of j
40 x 10 rad, and (2) a steam line break environment in which the u-f-
tranmitter circuit beards do not exceed a temperature of 320 decrees R,
Fahrenheit, radiaticn dose of 6 x 105 rads, and radiation dose rate H-cf 7 x 104 rad / hour.
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/.s a result of our review, we h. ave concluded that, t;hile the tests described in the subject report provide additional assurance that the transmitters Uculd initiate short-tern protection systen actions
- ithin acceptable inst rurent accuracies, t.bc tests do not nrovide an acequatLtisis to artwt---t4m use cflhese transmitters as instru..ents
.ngi_ rcd for crerater actirns durinc lenc term post-accident ccoling.
' Therefore, we require that acditional justification be provided to ce cnstrate that these transitters will r.eet all of their perfor:..ance specification requirements.
In the interin, we will require applicants l
and licensees to describe (1)' alternate quTlified instru ents and/or y
precedures for canually controlling reactor conditions during long-
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1 term post-accident cooling, and (2) the bases for' acceptability of the Leasured error in the Barton 763 narrow range pressure transuitter m
for initiating shcrt tern protection system actions.
For those plants in which the calculated containment environment temperatures excecd J
these values specified for sequential tests, we will also require applicants and licensees to show that protective enclosures around V
transitters t.culd prevent transnitter tecperatures from exceeding
{ values ueasured in the tests.
Uithin 30 days of receipt of this letter, provide a schedule for subission of the additional infcrmation regarding qualification of t' lese transmitters as requested in the enclosed evaluation.
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Inforc.ation to dcronstrate that these tranmitters are fully
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qualified or acceptable alternatives as described in the preceding raracraph must be submitted prior to issuance of operating licenses 7 %
for plants using these transmitters.
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Sincerely, Original signed by hhn T. S t ol::
John F. Stciz,. Chief Light Uater F.cactors 3 ranch lo.1 Livisicr. cf Troject :.anacement U
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