05000366/LER-1979-036-01, /01T-0 on 790516:sprinkler Hanger Mods Indicated Seismic Design Deficiency for Cable Spreading Room Designs.Proper Analysis & Mods Have Begun

/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: 05000366/LER-1979-036, Forwards LER 79-036/01T-0 05000366/LER-1979-036-01, /01T-0 on 790516:sprinkler Hanger Mods Indicated Seismic Design Deficiency for Cable Spreading Room Designs.Proper Analysis & Mods Have Begun
References
LER-79-036-01T, LER-79-36-1T, NUDOCS 7906060249
Download: ML19270G383 (4)

LER-1979-036, /01T-0 on 790516:sprinkler Hanger Mods Indicated Seismic Design Deficiency for Cable Spreading Room Designs.Proper Analysis & Mods Have Begun

Event date:
Report date:
3661979036R01 - NRC Website

text

3 cou rnoi.ateco l. i I

1 I

I IQ (PLEASE PnifJT CR TYPE alt. nEQUIRED lf;FOn?.1ATION)

+

6 Ic'l A I F l t IF 11 !Glo lo lo lo lo lo lo i n l o l o l o l@l 41111111il@l I

l@

A 9 Licit. HEE CODE 14 15 LICENSE tev\\l6Eil 2S 26 LICENSE T vPE JJ 57 CAI 64 i

SC"J LtJ@lo I s Io Io lo 13 i r,i e !Gio is il is 1719 l@ln is i 3 l o 17 19 l@

8 63 64 GOCC T *.U*.tB E*4 01 6J EVENT OATE 34 75 REPOHT DATE 6J 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:

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

Subsecuent investigation

[

] 1 revn= lad r re areas affected.

All hangers had been soecified accordine to seismic 1

.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 i

B1 conditiens the systers were closer to seisnic oualificatirn tMn (continuedl I

83 s9 CC"??.

VALVE 1

S Y S T E '.

CAUSE

CAUSE CCOE CODE SUSCOCE CCP.'PONENT CODE SUCOCOE SUSCOOE

]

A l B l@ IB l@ [ A l@ l S I UI P l 0 ! R l T I@ ] A l@ W @

S 10 11 12 13 18 19 20 SEQUENTI AL OCCURRENCE nt ORT REVISION LER/RO EVENT YE AR REPORT NO.

CCCE D PE NO.

@, peg l21 7 J 91 -[

10 [ 3 ( 6j l/l 10 l 1 l lTl l-l [0l 22 23 24 26 27 23 2'J O.

31 32 i

ACTION FUiUni EFFE07 SHUTOO'?cJ A TT A C M.* f N T P.p R M PRI'.t E COMP.

CC'! F C*.! N T OU 5 *.'t T T E D FCP t.1 M.A.

SU %iER M A*.U F A C T A E q T A K EiJ ACTiCN CN FLt.3.7 Af E T N CO HOURS LF_j@l 71@

L7J@

I 7 l@

I ol ol of of I Yl@

L!ijE IAl@

l G 121516 !@

i 33 J4 35 36 3 '.

40 41 42 43 44 4;

cAUSE CESCn'PTIC?J A?;O CORRECTIVE AcTIOtJS h p i The architect-encineer had submitted acoroved sorinkler syst:m desicns to meet inC l

gI ccmmitments which had not received a detailed seismic analys's.

Uoon recocnitinn i

of the event, the analys.is and modifications were begun immE"ately on the affected }

7 l GI systems.

On 5-26-79, modification ard cualification of Uni- ? related syste s '. tere 1 91 comolete and en 5-29-79. modification of Unit 1 related fMntinuedi l

E3 8 9 ST S

. P C'.". E R OTHE R STATUS SCOVERY DISCO.*ERY DESCRIPTION

]lAl@ lol0lo!@l N/A l

[D_j@lDroeosed odifimtiens indicated nrele I 60 3 9 10 12 11 44 45 46 ACTIVITY CONTENT RELE ASED OF RE' E ASE AVOUNT OF ACTIVITY LOCASON OF RE LE ASE -

I l Z l @ [Lj@l N/A l

l N / f.

6 80 g 9 la 1:

44 45 PERSONNEL ExPCSUR ES NU?.'B E R TYPE CESCRIPTION 4

@ l0IoI0.j@lZl@l N/A l

80 5 9 il 12 13 A

Qj

• / q

/l PERSONN % INJUA.ES f

NUV9EF DESCRIPitCN

• I 9 toIoIol@l PUA 83 7906060 M q 8 9 11 12 LOSS CF OR OA*> ACE TO FACILITY 33

'-] L7J@l I

TYPE CESCniPT!os N/A

. 9 h

O e

UM'h uu a vu u a 68 69 30 g *j N/A i

lllll11I))Ill{

iSSUEn CESCHiPTION 8 uuSI a

n m

4 8 3 to 0000' N*

b*

U*

1 PH O r.l.

NA?.'E OF PREPAnEn

~

~~

I Georgia Power Company Plant E. I. Hatch Baxley, Georgia 31513 e

Event Description and Probable Consequencescalculations indicated.

~,

Cause Description and Corrective Actions~

sytems was begun and is to be com.pleted by the end of the Unit 1 Refuel-ing Outage.

e 2274 292 e

O

_..;. ~.:., ".

A.=,*

,, *..=

L

~..

u.....

f l

NARRATIVE

SUP/1ARY 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

' i.

s **N(f?*;Q

..-, m....' *.-3 4.,y

-.,c.

i

~

. -r

. ;.7:.~. l :.%

_'.,,,,,,_._..,.s,'

_m....

~_

__m.____

ti

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 the. piping of the isolated dry-pipe systems.

Final calculations have rev-i caled further modifications, and both calculations and modifications will l'

be complete for areas affecting each unit before start-up of that unit.

e 2274 294 4

h 9

f o

E i

s O

i 1

.rt

')

~

e if ij os

• se

, ~

+

',4 '..,,...,."..;

v-.

' Ii