ML17277A429

Forwards Suppl to Engineering Evaluation of Wpps Unit 2 Sacrificial Shield Wall. Suppl Responds to Questions Raised in 800806 Meeting.W/O Encl

ML17277A429
Person / Time
Site:	Columbia
Issue date:	08/20/1980
From:	Renberger D WASHINGTON PUBLIC POWER SUPPLY SYSTEM
To:	Engelken R NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION V)
Shared Package
ML17277A426	List: ML17277A425 ML17277A427 ML17277A428 ML17277A429
References
GO-80-183, NUDOCS 8302040128
Download: ML17277A429 (3)

Text

INTERNAf DISTRIBUTION WC.4-1";ov','K Earle RL Ferguson LT Harrold.'T)~~per Rl.g@son JD',.4P'cin DL Renberger DC T'immins-w/att WD Vaugh ME Witherspoon.SSW File-w/att DLR/lb DCT/lb SF (2)PF THIS LETTER SATISFIES COMMITMENT NO.THIS LETTER (DOESI ID NOT)ESTABLISH A NEW COMMITMENT.

~j p WPPSS CORRESPONDENCE NO./G02-80-183 August 20, 1980 Docket No.50-397 Mr.R.H.Engelken, Director NRC Region V Suite 202, Walnut Creek Plaza 1990 N.California Boulevard WIalnut Creek, California 94596

Dear Mr.Engelken:

O

Subject:

WPPSS Nuclear Project No.2 Sacrificial Shield Wall (SSW)Corrective Action Plan

Reference:

Letter, DL Renberger to RH E g lken, a s ect, G02-80-168, dated August 1, 1980 The reference transmitted to you and the 0'f Inspection and Enforcement (ISE)a report on the su c corrective action plan.The report in conjunction with the meeting held e ffices of NRR on August 6, 1980, was intended to form the basis for NRR p o 1 of the proposed replacement weld and to provide an opportunity o resol 5 cerns/questions on the overall evaluation of the SSW.In e ecting e items were identified.which required a formal reply in der o los th issues associated with the SSW.Specifically, 1 ify t original intent of the dimensional tolerances associated w't the fabrication of the SSW, o Provide the as-built dimensional information associated with the out-of-roundness and verticality of the SSW adjacent to the 541'-5" elevation, o Provide the design margin of the original plug weld design, o Provide an assessment of the secondary stresses of the proposed partial penetration weld due to its eccentricity, o Discuss the leachability of lead from the selected shield material and provide the results of the various qualification tests, and o Provide the rationale for leaving known defects in the SSW.8302040i2B 830i25 PDR ADOCK 05000397 A PDR SECTION FQR APPRovAL DF AN Kuol er APPROVED DATE WP 3S7 RT Jo n on J8/Hid'o WC Bibb@pi ME With r D V.)/8/gal (FoR sIGNATURF DF: DL Renberger

+a Hr.R.H.Engelken Page 2 G02-80-183 August 20, 1980 Each of the above items is discussed in an enclosure to this letter, a supplement to the original report entitled"Engineering Evaluation of the MNP-2 Sacrificial Shield Mall", submitted with the reference.

It is our understanding that resolution to the first four (4)items will close the technical issues being reviewed by NRR on the proposed replacement weld.Additionally, resolution of the latter two (2)items will close the concerns that IEE, including NRC Region V, has on the overall evaluation of the SSM.The NRR concerns were discussed informally on August 15, 1980, with the responsible Structural Engineering Branch reviewer.Me believe that these concerns are now resolved, and as such, NRR may concur with the proposed replacement weld.t The time elapsed in our efforts to resolve concerns on the SSW has resulted in the replacement weld and drywell work becoming critical path to Project completion.

We must begin wor k on these items as soon as possible to have any opportunity to regain our schedule or avoid further schedule slippage, refer to enclosure 2.In consideration of the above, we request that the Office of Inspection and Enforcement expedite the technical release by NRR on the replacement weld and subsequently remove the construction hold on this repair at the earliest possible time in conjunction with the work startup agreements made between the Supply System and NRC Region V.Based on the anticipated schedule of construction activities for the SSM, we request that the construction hold on the SSW in general be removed by October 3, 1980.Very truly yours, DLR:DCT:rmm D.L.Renberger Assistant Director Technology

Enclosures:

(2 each)as noted cc: V.Stello, NRC (w/att.-2)ND Lewis, EFSEC, Olympia JR Lewis, BPA JJ Verderber, BSR-New York-w/att RC Root, BSR-Site X, WNP-2 File w/att AD Toth, NRC, Region V II

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