ML20064F204

/01T-0 on 781113:during Steady State Oper,It Was Discovered That Only One Seal or Barrier Exists for Spare Pipe Penetrations in Conflict W/Fsar Due to Oversight of Design Personnel.Engineering Is Analyzing It for Solution

ML20064F204
Person / Time
Site:	North Anna
Issue date:	11/21/1978
From:	Cartwright W VIRGINIA POWER (VIRGINIA ELECTRIC & POWER CO.)
To:
Shared Package
ML20064F189	List: ML20064F186 ML20064F204 ML20064F216
References
LER-78-122-01T, LER-78-122-1T, NUDOCS 7811280320
Download: ML20064F204 (2)

Text

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74 75 HEPOR ( DATE 80 7 8 60 61 DoCKE T NUMBER EVENT DESCRIPTION AND PROBABLE CONSEQUENCES h 10 l 2 l l During steady state, 97% power operation. it was discovered that only one sent or I l O 13 l l barrier exists for the spare pipe penetrations. FSAR Section 6.2.4.3. pane 6.2-125 l O 4 l requires double barriers or seals between the containment atmosphere and the environ- l O 3 l ment for all spare pipe penetrations. I I

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CAUSE DESCRIPTION AND CORRECTIVE ACTIONS 3 O lDuring the design stages of North Anna Unit 1, design personnel overlooked the double I i i l barrier requirement and only incorporated one barrier or seal in the enzineerine I

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Attachment:

Page 1 of 1 Docket No. 50-338 Report No. LER 78-122/01T-0 Description of Event Surry Power Station personnel notified us that a possible discrepancy may axist between our FSAR commitment and the as-built plant condition with regard ?.o the spare pipe penetrations. A review of the FSAR revealed that all cor cainment spare pipe penetrations are to be sealed at both ends by means of a welded pipe cap. A review of the engineering drawings and actual penetrations revealed that only one welded pipe cap existed for each spare pipe. This affects all twenty-six spare penetrations in Unit No.1. ,

Probable Ccnsequences of Occurrence The welded pipe caps function as a leak-tight barrier against the uncontrolled release of radioactivity. The present spare pipe penetration f-x seals were demonstrated to be leak tight by the Type A Containment Integrated

'- Leak Rate Test conducted during Unit 1 pre-operational testing. Hence, this occurrence resulted in no danger to the operating personnel or public.

Cause The second welded cap requirement was. inadvertently overlooked during the design stages.

Immediate Corrective Action No immediate action was taken.

Scheduled Corrective Action An engineering evaluation of this problem is being undertaken to determine what corrective action is required.

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Actions to Prevent Recurrence No further action required.