ML20065B584

Final Deficiency Rept D/N 44 Re Compressible Matl - Embedded Containment Penetrations.Initially Reported on 820921.Load Case Test Results Confirm Subj Deficiency Not Reportable Per 10CFR50.55(e)

ML20065B584
Person / Time
Site:	Satsop
Issue date:	02/11/1983
From:	Leddick R WASHINGTON PUBLIC POWER SUPPLY SYSTEM
To:	Sternberg D NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION V)
Shared Package
ML20065B570	List: ML20065B566 ML20065B584
References
10CFR-050.55E, 10CFR-50.55E, D-N-44, G3-83-135, GO3-83-135, NUDOCS 8302230246
Download: ML20065B584 (4)

Text

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Washiraton Public Power Supply System Box 1223 Elma, Washington 98541 (206)482-4428 Docket No. 50-508 February.11,.1983 G03-83-135 U. S. Nuclear Regulatory Commission, Region V Office of Inspection and Enforcement 1450 Maria Lane, Suite 260 Walnut Creek, California 94596-5368

' Attention: Mr. D M. Sternberg, Chief Reactor Projects Branch No. 1

Subject:

POTENTIAL 10CFR50.55(e) DEFICIENCY COMPRESSIBLE MATERIAL - EMBEDDED CONTAINMENT PENETRATIONS (D/N #44)

Reference:

Letter, G03-82-1090, Doc.ket No. 50-508, Mr. R. S. Leddick to Mr. D. M. Sternberg, same subject, dated October 25, 1982.

f The referenced letter reported that Ebasco and Chicago Bridge and Iron had not completed their analysis of the subject deficiency. Specifically, the evaluation of one of the load cases had not been completed. The analysis has since been completed with results confirming that the subject deficiency is not reportable in accordance with 10CFR50.55(e).

l Attached is the Supply System approved final report for the subject con-l dition. The report details ~a description of the deficiency, corrective l actions taken and analysis of the safety implications. Should you have any questions or desire further information, please contact me directly.

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, QMD -

I R. S. Leddick (761)

Program Director, WNP-3 DRC:nj Attachments cc: J. Adams - NESCO D. Smithpeter - BPA Ebasco - New York WNP-3 Files - Richland

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8302230246 830216 i PDR ADOCK 05000508

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WASHINGTON NUCLEAR PROJECT NO. 3 DOCKET 50-508 a

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h0TENTIAL 10CFR50.55(e) DEFICIENCY FINAL REPORT COMPRESSIBLE MATERIAL - EMBEDDED CONTAINMENT PENETRATIONS-D/N NO. 44 i

Description of the Deficiency On October 14, 1981, Ebasco Site Engineering observed that concrete had been placed inside the containment vessel up to approximately El.-365',

apparently embedding the inboard ends of penetration nozzles #23, #24, and #44 located in the vessel bottom head. Penetration nozzles #23 and

.#24 are 40 inches in diameter, located at El. 353'-6 and penetration

!44 is 8 inches in diameter located at - E1. ' 356'-0.

A subsequent. inspection established that ~only the inboard ends of nozzles

1. 23 and #24 had been directly embedded in the concrete and nozzle #44

, had been blocked out. Direct embedment without the benefit of compres-

, sible material between the nozzle and the concrete was not consistent.-

l with normal construction practice for such nozzles. . CB&I construction i

documents and stress reports were reviewed, but no requirements for com-i pressible material around these nozzles could be found._ However, in l raiewing the CB&I bid proposal d9cuments the following excerptwas dis-i covered:.

"Before embedment of any penetrations in the bottom head, a 2" thick compressible material will be placed'around the outside of the penetration neck. Also, a strip of compressible mat-erial will be placed around the: periphery of the insert plate.

The purpose of this compressible material is to eliminate any shear forces being transferred to either the penetration neck or the insert plate in case the head is strained below the point of embedment."

.. Based on this statement and conversations with CB&I, it was determined that CB&I's original intent was that these penetrations not be directly embedded

.in concrete without inclusion of compressible material.

Corrective Actions Taken.

, On November 11, 1981, Ebasco formally requested CB&I to perform the following:

a) An analysis of the vessel to determine the existence and magnitude of the shear forces at the embedded penetration nozzles and insert plates.

This analysis should consider shear friction of the concrete to the

- vessel as a means of reducing the shear transfer to the nozzles.

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fPOTENTIAL 10CFR50.55(e) DEFICIENCY

. FINAL REPORT Compressible Material-Embedded" Containment

Penetrations (D/N No. 44)

Page 2

- Corrective Actions Taken ,(Continued)- ,

b)' Develop detail drawings showing the methods:to~ accommodate the subject-shear forces. These methods may include the use of compressible material, shear lugs, etc. Regardless of the method used, sufficient information -

must be provided to allow construction to purchase, install and inspect

{- ' the necessary material.

c)- Update the Stress Report to include all pertinent. design data necessary j' to adequately address the subject design / loading condition.

In April,1982, CB&I responded by issuing their analytical report for Ebasco's review and accep.tance. Ebasco's ' review questioned the validity of the;analyt-

. ical technique used to solve.a nonlinear 3-dimensional problem.

At a joint meeting held in May, ~1982, Ebasco and CB&I agreed that Ebasco would.

4 perform an independent analysis using the ANSYS computer program, t

! The'Ebasco analysis was based on the. absence of compressible material at the i- interior concrete / vessel- interface and the presence of compressible material

j. on the outboard side of embedded penetrations #23 and #24. The analysis determined the extent of relative displacement between the embedded nozzles

and' adjacent concrete. In addition, shear forces. acting on the nozzles due a

-to displacement were generated. In_0ctober, 1982, Ebasco completed the analysis j' of the penetrations and transmitted the loads derived from the computer output:

to CB&I to enable them to evaluate the stress levels induced in the vessel and the two penetration nozzles in question. In January,1983, CB&I completed its evaluation of the loads established by Ebasco and conclu< fed that the stresses on the vessel and these penetration nozzles are within code ~ allowables

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without compressible material on the inside. Ebasco has reviewed the CB&I

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analysis and has concurred therewith.

l Based on the results of Ebasco's and CB&I's analysis as described above, r which confirmed that the as-installed conditions of penetrations:#23 and #24 are acceptable, no corrective actions need to be taken for these penetrations.

l Although penetrations #23~ and #24 require no corrective' action, the accessible areas of all penetrations (i.e., the outboard sides of #23, #24 and both in-board and outboard sides of #44) will be wrapped with compressible material prior to embedment.

Analysis of the Safety Implications As previously stated, Ebasco and CB&I's analysis confirmed that the stresses on the vessel and the penetration nozzles in question were within code allowables and the present design of the containment vessel and penetrations i

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POTENTIAL 10CFR50.55(e) DEFICIENCY FINAL REPORT Compressible Material-Embedded Containment Penetrations (D/N No. 44)

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1 Analysis. of the Safety .Implicat. ions (Continued) ,

is.acceptabl'e. Based.on this, were the deficiencies to have remained uncorrected, they would not have adversely affected the safety of operations of the plant at anytime throughout the expected lifetime of the plant. Therefore, the deficiency is not reportable in accordance with criteria of 10CFR50.55(e).

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