ML19329F924

RO 50-321/80-076:while Reviewing as-builts Submitted Per IE Bulletin 79-14,util Discovered Hangers 1E11-RHRH-196 & 1E11-RHRH-313 Would Not Adequately Support Loads During Dbe. Caused by Faulty Design in Incorrect Valve Weights

ML19329F924
Person / Time
Site:	Hatch
Issue date:	07/02/1980
From:	Manry M GEORGIA POWER CO.
To:
References
IEB-79-14, NUDOCS 8007110368
Download: ML19329F924 (2)

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SUBJECT:

Hatch Unit 1, Docket No. 50-321 Notification of

d. j Reportable occurrence No. 50-321/1980-076.

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          //                                                                                                             NOTIFIED: Mr. Pete Taylor l

l DATE: 7-2-80

       .I.                                                                                                                                                                                     1 DATE: 7-2-80 TIME: 2:35 EDST
   ,f                                    DESCRIPTIDH OF Rt. PORTABLE OCCURRENCE
     '.                                  Initial Cendition TEc         Unit         I       reactor              was          in     hot         standby             for      the HPCI/RCIC investigation                      and        repair               effort          when the site engineering i
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staff was n o t. I f i e d that the axial supports for the 20" line '

         ,                               between the 1E11-F006A-D valves are inadequate.

b Nature of Occurrence {e' CIIIl c reviewing the as-builts submitted for the IE Bulletin i 79-14 program the AE discovered that hangers IE11-RRRH-196 and

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1 Ell-bHRH-313 would not adequately support their loads during a design bases earthquake. k this problem per PDCR 52M-054.The AE then informed the site of

          \                              Iceediate Corrective Action
         #{                              A design change request is being written to have the PDCR 4                              implemented.                      These supports #111 be modified prior to the (o

unit coming on line. Cause * 3' The apparent cause is due to' a faulty design in which

  *d.'                                   incorrect valve weights were used 'in                                                          t i. s     original computer analysia.
  }**                                   Supplemental Corrective Action MA p'.   .#
                                      - Status of Redundant is t
                                                                                                                   . f-S a cicup S y s t. e m s jy                                     Eutdown               cooling is not required and is not inoperable at this
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• time.

                                      , inoperable.

LPCI, core spray, ADS, ' and RCIC are operable. EPCI is i

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D.f lapact to Other' Unit ' He IE Bulletin as-Duilt review did not . Indicate any p'roblems I

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for the stallar supporte on the Un i t. 2 RER system. g 8007110 3W j

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I f ., t. 1 J u s t ific a t ico fer Cratinued Operatien [ Inc unit vill rematn at ste present low power conditions for i} EPCI testing until the supports can be modified. The analysis revealed that the existing supports were adequate to withstand h the operating bases earthquake (03E). The chances of ' l

     )                                                       experien=ing Acy          Iallure an OBE in .this area                                         is approximately 1 x 10-6,                                                                                                   l that             would        occur                    would                     not                   make            LFOI                         or c.c a t a ina c o t spray inoperable.                                                                                                                                                                                      !

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