ML20084L157

Updates AO for Discrepancies Noted in 740415 Insp Re Jet Pump Failure.Initially Reported on 740425.Restrainer Gates Removed,Gate Wedges & Bolt Keepers Redesigned & Error Reported Changing Jet Pump 5 to Pump 6 in 740425 Rept

ML20084L157
Person / Time
Site:	Quad Cities
Issue date:	05/30/1974
From:	Kalivianakis N COMMONWEALTH EDISON CO.
To:	Oleary J US ATOMIC ENERGY COMMISSION (AEC)
Shared Package
ML20084L155	List: ML20084L154 ML20084L157 ML20084L179 ML20084L184
References
NJK-74-87, NUDOCS 8305200299
Download: ML20084L157 (3)

Text

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-2 h May 30,1974 . h, dUjy J. ! @ h '

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b, nf Mr. John F . O ' Leary, Director ,g{aQgK,T:/ ,\ ~

Directorate of Licensing i Regulation l U. S. Atomic Energy Commission  :

Washington, D.C. 20545  ;

Reference:

Quad-Cities Nuclear Power Station Unit 1, Docket No. 50-254, DPR-29, Abnormal Occurrence Report Letter of April 25, 1974

Dear Mr. O ' Leary:

The purpose of this letter is to provide you with further information regard-ing the above referenced abnormal occurrence report. The original report described the initial findings and plans related to failures of several jet pump components of the Unit I reactor. The new information provided in this i letter has been discussed with Regulatory Operation's personnel as it became i kncw n .

1. Previous Re ortina Error - There was an error in report-ing in the April 25, 1974, report. Item 4 on page 2 under " discrepancies noted", reported that the restrainer gate wedge on jet pump 5 was missing. This should have read, the restrainer gate wedge on jet pump 6 was missing.  ;

The error occurred while transposing the data from the field check sheet to the draft for the report.

2. Restrainer Gates - All restrainer gate assemblies have been removed. New assemblies are being processed by General Electric Company. These new gate assemblics are due to arrive at the Station by May 25. 1974 3 Restrainer Gate Vedoes - Several of the original restrainer gate wedges fit in place too decoly and did not meet the installation tolerance specified. The wedges for the new gate assemblies have been redesigned to be slightly larger in size. The larger wedges should provide assurance that the required tolerance will be met.

4. Restrainer Gate Bolt Keerers - The restrainer gate bolt keepers have also been slightly redesigned. The new design eliminates a shoulder anc lip on the edges of the keeper.

These edges have caused interference and damage to the tip

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~jl of the welding electrodes used to tack the keeper in place. , V' The 1ip served no useful ourpose and thus has been elimi- .

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nated in order to aid in the welding operation.

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i-M r. John F. O 'Lzry Mcy 30,1974  ;

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5. Riser Braces - Tha risar brccss en all t:n jot pump inist j risers have been inspected with the underwater television camera. All brace to vessel wall welds were found to be intact.  !

6. Jet Pumo S 8. 6 Inspection - Jet pump 5 was lif ted approximately 2" from its normal position. The seating surfaces at both the inlet and outlet were inspected with the underwater television camera and found to be in normal condition. Jet pump 6 was lifted from its normal position and raised completely out of the water for inspection. Both the inlet and outlet seating surfaces were found to be in normal condition. Slight wear 6

on the order of a few thousandths of an inch was observed on the q belly band in the vicinity of the contact area with the wedge.

7 Missino and Loose Parts - Since the initial report, some of the .

reported missing parts have teen retrieved from the vessel.

Also, additional parts have been found to be missing, and some parts have been retrieved. Table 1 is a complete index of all parts known to be either missing or loose in the vessel along with their disposition to date. Attempts will be made to locate and retrieve the parts that are still missing. These parts will  ;

be sent to the General Electric Company at their Vallecitos i Nuclear Center, as required, to help determine the possible causes or reasons for the failures.

8. Jet Pump 7 Instrument Line - Several preliminary repair plans to fix the severed instrument line of Jet Pump 7 are being pursued by the General Electric Company. Because of the time c.n..tr.a tn a.u.ing th. tenilag necessery in imp!e-ent the repairs, the fix will not be available for the current outage.

it is planned to operate during this next cycle with the instru-ment li'ne as it now is, and to try to repair it during the next -

refueling outage. A safety evaluation regarding continued opera-tion in this manner will be submitted prior to startup of the unit.

Plans related to these problems are discussed at least daily between Edison and General Electric. Final resolution of all the problems is still pending as of this date. AEC Regulatory Operations personnel have been, and will continue to be updated frequently on the status of the repairs to the Jet pumps. Further information will be reported to you on a timely basis as further developments occur or until the necessary repairs are finalized and this report is closed out.

Very truly yours, COMMONWEALTH EDISON COMPANY QUAD-CITIES NUCLEAR POWER STATION r // /-

l Y.fhh2 N. J. Kallvianakis

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Station Superintendent NJK: REQ /Jeh cc: Region li t , Directorate of Regulatory Operations J. S. Abel i

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TABIE 1 hl QUAD CITIES NUCLEAR POWER STATION UNI'I 1 .

SPRING 1974 REIUELING OUTAGE IJ@EX OF MISSIUG AND IDOSE PARTS ORICItaL DATE OF DATE OF PART STA'IUS* DISCOVERY RETRIEVAL DISPOSITIO JP 5 Restrainer rate bolt head Missing 4 /16/74 _By 4/23/74 To GE - WJC JP 5 Restrainer rate bolt head Missing 4/16/74 5/25/74 To GE - WJC JP 6 Restrainer rate bolt head Missing 4/16/74 5/25/74 To GE - VUC JP 5 Restrainer bolt krcper Missing 4/16/74 By 4 /23/74 To GE - Vf;C JP 5 Restrainer bolt keeper Miseing 4 /16/74 By 4/23/74 To GE - VNC JP 6 Restrainer bolt keeper Missing 4/16/74 5/25/74 To GE - VNC JP 6 Wcdoc Missing 4/16/74 By 4 /23/74 To GE - WJC JP 6 Wrdge bnle Missinc 4/16/74 Uy 4/23/74 To GE - W;C JP 6 Wedce sprine Eissing 4/16/74 By 4/23/74 To GE - WJC Extra wed>c bale (later verified from JP 5) Inose 4/16/74 By 4/23/74 To GE - VNC I,PW. end connector Fell off 4/28/74 5/20/74 Fuel Pool JP 6 Inentor block Missinc 5/22/74 5/25/74 To GE - W3C JP 6 Locat or block adjustinn screw Missing . 5/22/74 5/25/74 To GE - VUC dP 7 Inentor block adjustinc screw Missinn 5/22/74 5/23/74 To GE - VUC

.iP 10 httniner for bram bolt Missinc 5/23/74 5/23/74 To GE .- VNC act.niner for bon bolt (later verified from JP 15) Ioose 5/23/74 5/23/74 To Gb u Vd'g Fetalnar for bemm bolt (later verified from JP 16) Ioose 5/23/74 JP 10 Bolt for nhove retainer Missinc 5/23/74 5/23/74 To GE - VNC JP 15 Bolt for above retainer Missin.7 5/23/74 JP 16 Bolt for above retainer Missinc 5/23/74 jelding Rod Loose 5/23/74 File Icose 5/23/74 5/23/74 Fuel Pool r:ylinder (later verified as part of vib. inst.) Irose 5/23/74 5/23/74 To GE - VNC O Missing means not in normal location and unaccounted for.

Loose means observed by TV to be at bottom of annulus, but source unknown.

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