05000275/LER-1983-004, Updated LER 83-004/08X-1:on 830419,grinding Wheel & Rotary File Gouges Discovered on Main Coolant Sys Piping on Discharge Side of Main Coolant Pump 3.Gouges Intentionally Caused by Unknown Persons.Gouges repaired.W/840117 Ltr

Updated LER 83-004/08X-1:on 830419,grinding Wheel & Rotary File Gouges Discovered on Main Coolant Sys Piping on Discharge Side of Main Coolant Pump 3.Gouges Intentionally Caused by Unknown Persons.Gouges repaired.W/840117 Ltr

ML20086K213
Person / Time
Site:	Diablo Canyon
Issue date:	01/17/1984
From:	Kessinger W, Shiffer J PACIFIC GAS & ELECTRIC CO.
To:	Martin J NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION V)
References
DCL-84-016, DCL-84-16, LER-83-004-08X, LER-83-4-8X, NUDOCS 8401260352
Download: ML20086K213 (3)

LER-2083-004, Updated LER 83-004/08X-1:on 830419,grinding Wheel & Rotary File Gouges Discovered on Main Coolant Sys Piping on Discharge Side of Main Coolant Pump 3.Gouges Intentionally Caused by Unknown Persons.Gouges repaired.W/840117 Ltr

Event date:
Report date:
2752083004R00 - NRC Website

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I UPDATE REPORT - PREVIOUS REPORT DATE 5/3/83 NIC FSCM 388 U s. ( UILGAD CCOULATKV CEMMisSIEN APP ~Ad LT L M) siso oen

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EVENT DESCRIPTION AND PROBABLE CONSEQUENCES Oto Io 12 ; LPrior to fuel load grinding wheel aM rotary file gouges were discovered on the l J o la l l main coolant system piping on the discharge side of #3 main coolant pump. Of the ]

j o l4 l l four gouges discovered, the most severe is approximately 0.150 inches deep x 2.0 l lo ts l l inches long x 0.150 inches wide causing a less than required minimum wall thickness. ]

Io le l l This event has in no way affected public health and safety, and is reportable per l l o l 7 l l Technical Specification 6.9.1.12.c. l IoIall l

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CAUSE DESCRIPTION AND CORRECTIVE ACTIONS 27 l i j o l l Gouges were intentionally caused y persons unknown. Gouges have been repaired l l

lili ll by weld build up and grinding flush, in accordance with an approved ASME Section l E l XI procedure. Additional corrective ai:tions taken are described in the attached l l i l 2 l l supplemental information. This is a final report. I lil4ll

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1 PACIFIC GAS AND ELECTRIC COMPANY DIABLO CANYON UNIT 1 DOCKET NO. 50-275 LER 83-004/08X-1

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SUPPLEMENTAL INFORMATION

1. A 100% visual inspection of the reactor coolant system pressure boundary, where insulation was removed, was conducted. No other indications of '

unauthorized work were detected.

2. All uninsulated Class 2 piping connected to the reactor coolant system inside containment has had a 100% visual inspection. No indication of unauthorized work was detected.

3. Construction and contractor supervisors n d PGandE Nuclear Plant Operations personnel were informed of the incident in order to increase general awareness and to promote watchfulness for potential similar events.

4. The PGandE/Bechtel Project increased supervision of all construction.

activities within the Protected Area.

5. Supervision will continue to promote increased awareness of specfic work tasks in progress and the specific individuals assigned to each work task.

6. The Security Department increased the frequency of patrols within the work force areas in order to increase the visibility of security fortes.

7. Construction personnel hare been and will continue to be informed of job security as related to work schedules in order to minimize the possibility of deliberate acts to extend work.

8. Investigation is continuing in an effort to identify the individual or individuals responsible for this incident.

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ffCE1VED pc PACIFIC OAS AND E LE C T RIC C O M PANY PGtadl3 l 77 BE ALE STREE1

• SAN FRANCISCO, CALIFORNihdkh1h81((/hddi 910 372 6587 JAMES D. SHIFFER DEPARTMENT OF AR PLANT CPERATIONS January 17, 1984 PGandE Letter No.: DCL-84-016 Mr. John B. Martin, Eegional Administrator U. S. Nuclear Regulatory Commission, Reginn V 1450 Maria Lane, Suite 210 Walnut Creek, CA 94596-5368 Re: Docket No. 50-275, OL-DPR-76 Diablo Canyon Unit 1 Update Licensee Event Report 83-004/08X-1 Gouge in Main Coolant System Piping

Dear Mr. Martin:

Pursuant to Section 6.9.1.12c of the Technical Specifications, Appendix A to the Diablo Canyon Unit 1 Operating License, the enclosed updated Licensee Event Report is submitted concerning the discovery and repair of gouges in the main coolant system piping.

This event has in no way affected the public's health and safety.

Sincerely,

-6 James . Shiffer Enclosure cc: G. W. Knighton Director, Office of Management Infonnation and Program Control Service List

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