ML19319E284

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Summary of 780208 Meeting W/Util & NRC Re Environ Qualification of Protected Terminal Blocks in Facility
ML19319E284
Person / Time
Site: Rancho Seco
Issue date: 02/16/1978
From: Olshan L
Office of Nuclear Reactor Regulation
To:
Office of Nuclear Reactor Regulation
References
NUDOCS 8004040541
Download: ML19319E284 (4)
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DJ February 16. 1978 Wv 0 ~9~3 m

Docket No. 50-312 SE

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TRANCHO SEtD: NUCLEAR SEMERATIllS STATION T@

FACILITY:

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Stf1 MARY OF FEBRUARY 3,1978 MEETING O!! THE E!!VIRONMENTAL. QUALIFICATION 73 -

0F P30TECTED TERMINAL BLOCKS IN PANCHO.SEC0

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j At a February 1,1978 meeting SMUD could not supply the necessary infomation about the environmental qualification of the teminal

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blocks used at containment penetrations in Rancho Seco.

(These teminal blocks are enclosed in NEMA Type 3 metal housings.) SMUD returned to Bethesda, on February 8,1978 to provide additional.infor-

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mation to the !!RC on the cualification of these teminal blocks..The E"-

meeting attendees are attached.

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p SMUD reported the results of qualification Iests performed per militaryA"a;g specifications by the Tensinal. block nonefactueer. KULKA. The bloEks were tested at relative humidities from 80 to 98% for240 hours. and7N..~'A 'O '

, seismically qualified to 16g. KULKA also perfomed a dielectric ^

withstand test and a current carrying capacity test.- In addition, 7's. M L

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within the last week the licensee has. exposed a terminal block to a 4

adiation eevironment of 10 mega,rnd;(.5 mega reds.for 20 hours2.314815e-4 days <br />0.00556 hours <br />3.306878e-5 weeks <br />7.61e-6 months <br />) and MN.

E..u.%G performed a. thermal. shock test of a terminal block to. include the - 26%A +

b.,4M06 maximum temperature experienced following a steam lies breatW.The M MW M.%g@t.,gterminal. block wasi. stepped freur.720Eto 4000F andsheld_therrfor;.,1,00pn y

h o seconds M The'.Mcensee reportedPtha pthe:.electrfcalientphysfcaP n

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i fN ugintegrity.of,the teminal block was'estatained fbliewieg1:hece m # '

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$y6b':chumid'.ty..'seismics electrfcal;radietica.and thersel tests.<Alsogfa

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    • - of the tarainal. block and its housing and reported.that it could

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withstand a seismic event. '

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-.n The licensee is runnina a test at the Franklin Institute on several teminal blocks mounted and enclosed as they are at thepolant. The

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test conditions todad those conditions within containment predicted followina a loss-of-ccolant accident. The test profiJe 14 as dellows:

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~ a ramp from 1200F, 0+2 psig to 3000F, 60 psig in 10 seconds. holding

.Rk at 3000F, 6G psig for 15 minutes,. dropping to 35 psig 2600F and

~y hokiing. there for 45 minutes, and then holding 35 psig. 2500F for A

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23 hours2.662037e-4 days <br />0.00639 hours <br />3.80291e-5 weeks <br />8.7515e-6 months <br />. At 5 minutes into the test, a boric acid spray will be applied to sirulate th? containrent spr3y.. The teminal blocks will be energized to 600 volts; in the plant the naximum voltace across these blocks is 480 +20 volts. A 500 volt megearcheck will be perfomed hourly. The test is scheduled to begin on February 8, 1978 7

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The licensee presented the required operating time'after a LOCA or.,,,

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,3 steam line break for equipment that utiitzes these.,tenninal blocks.gawg;i.

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T Reactor coolant' flow and pressure inst mmentation,1and Safety F p-P

% Actuation System 3nstrumentation is' required at 7 seconds; safety l~

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.; features isolation; valves at 35 seconds; and long tenn cooling flow

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->'.instmmentation and valves at 20 minutes. The licensee stated that. 4 i

this provides some assurance that'the reactor can continue safe

'f Y operation even if the teminal block does not pass the' 24 hour2.777778e-4 days <br />0.00667 hours <br />3.968254e-5 weeks <br />9.132e-6 months <br /> test

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being conducted at Franklin Institute.

v.f2 2-f The NRC staff stated that the qualification tests for humidity, seismic, electrical characteristics, radiation and terperature already performed, l

plus satisfactory completion of the LOCA test, would provide reasonable assurance that the Rancho Seco teminal blocks will function as needed

% following a LOCA or steam line breah.

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~ f(For details and results of'the test see memo from P. 01Benedetto, M. 4 L

- 47 '" Trip Report to the Franklin Institute Research Test for Envimnmenta1% 7 nn Qualification Verification:of, Terminal Blocks for.th t

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~ O Plant -(February 8 through 10,1978),

i dated February;,13r 1978).A. ' ~J 3m.3,3

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t "EETIflG Off RAf!CHO SECO TEP?IrlAL BLOCKS FF8Pl!ARY 8,1978 -

LIST OF ATTEtlDEES

~ ~ SMUD -

'R.: Colombo'

.R. Daniels.

~ R.' 'Dieterich -

P. Oubre

.D.-Raasch D. Whitney _

.NRC W.: Butler M. Chiramal-D.: Eisenhut

'T.

Ippolito L. 01shan-

'V. Rooney-

H. Schierling _

D.~Tondi D 'Ziemann.

.W. Russell

.P. DiBenedetto-R..Reid' l

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MEETING St'MMARY DISTRIBUTIO!1 1

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ORBd4 Sacramento l'unicipal litility District

. ATTN:'. Mr.'J. J. Mattimce.

. Assistant feneral Manager and Chief Engineer

- 6201 S Street

- P. O. Box!15830 Sacramento, California 95813 L. Shao NRG PDR R. Baer L POR W. Butler ORB #4 Reading B. Grimes NRR Reading-Project Manager E.

G.' Case

-Attorney, OELO V. Stello.

OI&E (3)

R. Ingram X. R.:Goller

- T. Carter R. Fraley, ACRS (16)

D. Eisenhut T. B. Abernathy

. A. Schwencer J. R. Buchanan D.-X.. Davis Meeting Sumary File G. Lear NRCParticipant(s)

R. Reid

'M. Chiramal, T. Ippolito, V. Rooney -

H. Schierling, D. Tondi. D. Ziemann. -

H. Russel, P. DiBenedetto, r,.

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