ML19270G383

LER 79-036/01T-0 on 790516:sprinkler Hanger Mods Indicated Seismic Design Deficiency for Cable Spreading Room Designs.Proper Analysis & Mods Have Begun

ML19270G383
Person / Time
Site:	Hatch
Issue date:	05/30/1979
From:	Thomas Greene GEORGIA POWER CO.
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II)
Shared Package
ML19270G381	List: ML19270G380 ML19270G383
References
LER-79-036-01T, LER-79-36-1T, NUDOCS 7906060249
Download: ML19270G383 (4)

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8 63 64 GOCC T *.U*.tB E*4 EVENT DESCntPTIO?J Ar;D PRC9AOLE CONSEQUENCES h I On 5-16-70 at 9_10 CST. while reviewino scrinkler hanner modifications crocosed b:, _j ,

I the architect-encineer, it was discovered that such modifications indicated a seis- l 1 sorinkler sys- 1

] l nic desinn deficiency for the Unit 1 and Unit 2 cable screadinc roc:

Subsecuent investigation [

I tens cer HNP-?-FS AR Section 3.2.1.1 and IEEE 303-1971.

] 1 revn= lad r re areas affected. All hangers had been soecified accordine to seismic 1 i

.D L_goi dal i a m = t s e i- n wore t c a s e . wet oica variables so that in the isolated dev-oine B1 conditiens the systers were closer to seisnic oualificatirn tMn (continuedl I 83  ;

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ccmmitments which had not received a detailed seismic analys's. Uoon recocnitinn i gI 7 l of the event, the analys.is and modifications were begun immE"ately on the affected }

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Event Description and Probable Consequences (continued) calculations indicated.

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Cause Description and Corrective Actions (continued) sytems was begun and is to be com.pleted by the end of the Unit 1 Refuel-ing Outage.

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NARRATIVE SUP/1ARY .

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'1-LER 2-79-36 I

l In reviewing the Grinnell as-built drawings of new sprinkler systems in- l[

stalled during the first half of 1978, to meet the 1979 due dates, it 'i was discovered by the architect-engineer that these NRC fire protection  ;

com:nitr.ent related syster.s had received an inadequate seismic review End ' '

that modifications would be necessary to meet the design loads. Upon notification of the proposed modifications the responsible personnel on site proceeded to obtain details on design bases and additonal systems .,

affected. Pending clarification of the problem, the design deficiency for

• i the more critical area, the ccmmon cable spreading room was reported at both units, and the approved design modifications to this area were begun.

At this point it was found that several other systems were seismically in-adequate. The affected systems, committed operability date, and modific-ation schedule are summarized below:

• SPRINKLER SYSTEM C0:0!ITME::T DATE MODIFICATIC::S A::D COSCOLETE  :

UNIT 1/U::IT 2 QUALIFICATION BY: (UNIT 1/U::IT 2) l Intake Structure Jan. 31, 1979 5-25-79; no modifications (common) required .

RPS' Cableway Unit 1, 1979 5-26-79 (com:: on) refuel Control Building Unit 1, 1979 5-26-79/5-26-79 Corridcr at El. refuel 130' (Units 1

& 2)

Rx. Building HVAC Unit 1, 1979~ 6-30-7 9/ir-26-7 9 Rooms at El. 164' refucl/ Unit 2, (Units 1 & 2) 1980 refuel Cable Spreading Unit 1, 1979 5-26-79/I-26-79 Room refuel ,

I Rad-Waste Dry Waste N/A 6-30-79 (

Storage (Unit 1) -

Recire. MG Set Jan. 31, 1979 6-30-79 (Unit 1) '

East cableway July 31,,1978 6-30-79 (Unit 1)

HPCI Room May 31, 1978 6-30-79 (Unit 1) k 2274 293 J

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Those systems already declared operable were not impaired in their fire protection functions, and degradation of the seismic qualification of systems beneath the sprinkler systems was minimal since the initial designs were based on seismic guidelines assuraing a worse case of water being in i

the. piping of the isolated dry-pipe systems. Final calculations have rev-caled further modifications, and both calculations and modifications will l' , be complete for areas affecting each unit before start-up of that unit.

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