ML20052A838

Ro:On 770512,during Routine Shutdown,Discovered That Skirt Section of Reactor Pool Cover Had Not Been Put in Place During Previous Reactor Shutdown.Caused by Personnel Error. Shutdown Sequence List Revised

ML20052A838
Person / Time
Site:	Vallecitos File:GEH Hitachi icon.png
Issue date:	06/10/1977
From:	Darmitzel R GENERAL ELECTRIC CO.
To:	Stello V Office of Nuclear Reactor Regulation
Shared Package
ML20052A734	List: IR 05000070/1977001 IR 05000070/1978002 ML20052A733 ML20052A741 ML20052A743 ML20052A746 ML20052A748 ML20052A756 ML20052A758 ML20052A764 ML20052A768 ML20052A771 ML20052A773 ML20052A781 ML20052A784 ML20052A786 ML20052A792 ML20052A796 ML20052A800 ML20052A804 ML20052A806 ML20052A810 ML20052A816 ML20052A820 ML20052A823 ML20052A826 ML20052A828 ML20052A834 ML20052A836 ML20052A838 ML20052A841 ML20052A846 ML20052A848 ML20052A853 ML20052A857 ML20052A860 ML20052A862
References
FOIA-81-483 NUDOCS 8204290256
Download: ML20052A838 (2)

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=,Y NUCLEAR NERGY GENERAL ELECTRIC PROGR[1S DIVISION

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GENERAL ELECTRIC COMPANY. VALLECIToS NUCLEAR CENTER.

PLEASANToN, CALIFORNIA 94566 PHONE: (415) 862 2211 TWX:

910-548-8481 ble o

June 10, 1977 g

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Mr. Victor Stello, Director Division of Operating Reactors Office of Nuclear Reactor Regulation U.S. Nuclear Regulatory Commission Washington, D. C. 20555

Reference:

License TR-1 Docket 50-70

Dear Mr. Stello:

During a routine shutdown of the General Electric Test Reactor (GETR) on May 12, 1977 it was discovered that a skirt section of the reactor pool cover had not been put into place during the previous reactor shutdown. Accordingly, the reactor was operated at full power for approximately seventeen days without the skirt section in place. This occurrence is considered reportable pursuant to paragraph 3.D.(2) of License TR-1.

During the shutdown, the missile shield which covers the reactor pool was removed, and it was noted that the section of the pool cover skirt which attaches to the gates between the reactor pool and the reactor canal was not in place. Nomally during a shutdown, the gate section of the skirt is removed and replaced with a ladder to allow access to the pressure vessel head. After the pool is raised to the third floor Icvel for the last time, the ladder is removed and the skirt section is replaced.

The step in the Shutdown Sequence list which describes the required action is surded as follows:

" Raise Pool Level. Remove portable ladder and install skirts on canal gates while pool is raising".

The sign off and verification for this step cover u,o separate operations, one required to be performed in the control room and the second perfomed on the third floor of the reactor containment building. Although the step had been signed off as completed by the employee in the Control Room, the skirt section had not been* replaced.

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9 GENER AL h ELECTRIC Mr. Victor Stello June 10, 1977 In order to prevent recurrence of this problem, the Shutdown Sequence list has been revised to separate the tw operations and to require an individual sign-off for each of the operations.

In addition, a sign-off was added to verify that all skirt sections are in place prior to the installation of the pool cover.

Sincerely, M

R. W. Darmitzel, Manager Irradiation Processing Product Operation vec cc:

R. H. Engelken, Director Office of Inspection and Enforcement Region V U.S. Nuclear Regulatory Comission Suite 202 Walnut Creek Plaza 1990 N. California Boulevard Walnut Creek, Ca. 94596 O

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