05000366/LER-1984-001, :on 840203,personnel Detected Fracture in 66- Inch Vent Header in Bay 5.Caused by Brittle Facture of Vent Header Matl.Vent Header Will Be Repaired & Addl Changes or Sys Mod Will Be Made to Improve Sys

:on 840203,personnel Detected Fracture in 66- Inch Vent Header in Bay 5.Caused by Brittle Facture of Vent Header Matl.Vent Header Will Be Repaired & Addl Changes or Sys Mod Will Be Made to Improve Sys

ML20081B859
Person / Time
Site:	Hatch
Issue date:	03/04/1984
From:	Nix H, Tipps S GEORGIA POWER CO.
To:	NRC OFFICE OF ADMINISTRATION (ADM)
References
GM-84-160, LER-84-001, LER-84-1, TAC-54150, NUDOCS 8403120031
Download: ML20081B859 (5)

LER-1984-001, on 840203,personnel Detected Fracture in 66- Inch Vent Header in Bay 5.Caused by Brittle Facture of Vent Header Matl.Vent Header Will Be Repaired & Addl Changes or Sys Mod Will Be Made to Improve Sys

Event date:
Report date:
Reporting criterion:	10 CFR 50.73(a)(2) 10 CFR 50.73(a)(2)(ii)(A), Seriously Degraded
3661984001R00 - NRC Website

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REPORT DATE (F)

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,nas On 02/03/84, during an inspection of the torus interior on Unit 2, plant personnel dstected a fracture in a % inch vent header in bay 5.

The cause of this event is a brittle fractuce of the vent header material. This fracture resulted from the vent hsader material being subjected to a temperature below its nil ductility temperature (NDT). Since a nitrogen inerting systera line is located directly above the vent header in the vicinity of the crack line, it is speculated that the inerting system was the l

ccuse of the low temperature.

1 The vent header will be repaired prior to startup. Additionally, procedure changes tud/or system modifications will be made, as necessary, to improve the operation of the nitrogen inerting system.

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This report is required by 10CFR 50.73 (a)(2)(li)(A).

PLANT CONDITIONS AT THE TIME OF Tile EVENT (S):

On 02/03/84, at approximately 11:00 CST, Unit 2 was in cold shutdown fer the recirculation pipe replacement outage.

DETAILED DESCRIPTION OF THE EVENT (S):

On 02/03/84, during an inspection of Unit 2's torus interior, plant personnel detected a fracture in a 66 inch vent header in bay 5.

SUMMARY ASSESSMENT OF ACTUAL AND POTENTIAL SAFETY CONSEQUENCES AND IMPLICATIONS:

An analysis by General Electric showed that if the size of the fracture (i.e., approximately 26 square inches) had remained the same, three would have been sufficient steam condensing capability had a Loss of Coolant Accidant (LOCA) occurred.

STATUS OF REDUNPANT OR LACKUP SUBSYSTEMS AND/OR SYSTEMS:

Thsre is no backup system for the vent header.

JUSTIFICATION FOR CONTINUED OPERATION:

Ths vent header will be repaired satisfactorily prior to unit startup.

IF REPETITIVE:

NUMBER OF PREVIOUS LER:

This is a non-repetitive event.

l WHY CORRECTIVE ACTION DID NOT PR2 VENT RECURRENCE:

N/A IMPACT TO OTHER SYSTEMS AND/OR UNIT:

This event did not affect other systems on Unit 2.

Ge:rgia Power Company management ordered Unit 1 to be placed in cold shutdown as a precautionary measure.

The Unit 1 torus was inspected for' cracks and none were found.

Unit 1 was then returned to normal cperation.

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NRC* Form 3esA U S. NUCLEAR F.EGULATO3Y COMMIT $10N LICENSEE EVENT REPORT (LER) TEXT CONT!NUATION APPROVED OM8 NO 31604104 EXPIRES 8/3f15 FACILITY NAME (1)

DOCKET NUMBER (2)

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v EDWIN I. HATCH, UNIT 2 0 l5 j o l 0 l 0 l 316l 6 8l4 0l0l 1 Ol 0 Ol 30F 0l4 rEnr ou. m n,~.. w. m. =M w a ra, nwonm CAUSE(S) OF THE EVENTS (S):

Ths cause of this event is a brittle fracture of the vent header saterial.

An examination of metcl samples of the 66 inch vent header indicated that the fracture was caused by the vent header material b31ng subjected to a temperature below its nil ductility temperature (NDT).

Since a nitrogen inerting system line is located directly cb2ve the vent header in the vicinity cf the crack line, it was dstermined that the inerting system was the cause of the low tecperature to which the vent header was subjected.

IMMEDIATE CORRECTIVE ACTION (S):

Tha vent header will be repaired prior to startup from the current

.cutage.

SUPPLEMENTAL COttRECTIVE ACTION (S):

Additionally, procedure changes and/or system modifications will be mide, as necessary, to improve the operation of the nitrogen inerting system.

SCHEDULED (FUTURE) CORRECTIVE ACTION (S):

N/A ACTION (S) TO PREVENT RECURRENCE (IF DIFFERENT FROM COPHECTIVE ACTIO?'S):

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I hmC FORM 36SA (S 835 a

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Georgi 3 Powir Company

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• • Post Offica Box 439 c

B:xity, Georgim 31513 Telephone 912 367-7781 912 537-9444 m

Edwin I. Hatch Nuclear Plant March 4, 1984 GM-84-160

- PLANT E.

I.

HATCH Licensee Event Report

- Docket No.

50-366 United States Nuclear Regulatory Commission Document' Control Desk Nashington, D.C.

20555 Attached - is Licensee - Event Report No. 50-366/1984-01.

This report ia required by.10 CFR50.73(a)(2)(ii)(A).

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