ML20099E353

Interim Deficiency Rept Re Small Bore Piping Anchor Design. Initially Reported on 840816.Listed Corrective Actions Will Not Be Pursued & No Further Repts Will Be Made Unless Facilities Reactivated

ML20099E353
Person / Time
Site:	Midland
Issue date:	11/09/1984
From:	Jackie Cook CONSUMERS ENERGY CO. (FORMERLY CONSUMERS POWER CO.)
To:	James Keppler NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION III)
References
CON-#484-144 32055, 84-13-#I, OL, OM, OM-OL, NUDOCS 8411210246
Download: ML20099E353 (4)

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Power, Company-Vice President - Projects, Engineering and Construction

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oeneral offices: 1946 West Pernell Road, Jackson, MI 49201 e (517) 78&O453 November 9, 1984 84-13 #1 Mr J G Keppler, Regional Administrator

~US Nuclear. Regulatory Commission' Region III 799 Roosevelt Road Glen Ellyn, IL '60137 MIDLAND ENERGY CENTER PROJECT DOCKET NOS 50-329 AND 50-330 SMALL BORE P1 PING ANCHOR DESIGN -

FILE:

0.4.9.100 SERIAL:

32055 On August 16, 1984, Consumers Power Company notified your staff of a potentially reportable condition concerning small bore piping anchor design. Pending resolution of our discussion with the staff on our request.to waive the requirement to submit a written 30-day 50.55(e) report during the project shutdown, we have prepared this interim report on the above subject.

Description of Concern Bechtel Safety Concern Evaluation Report (SCER) 84-30-SP provides the following:

Small bore standard calculation 400-010(Q) and 400-011(Q) allow a reduction in the collapse moments on the non-seismic side of'an anchor by a factor of 2.1 due to the proximity of the socket-weld elbow. It appears that the intensification factor was incorrectly i

applied in the aforementioned calculations resulting in inaccurate load and stress distribution to the baseplates and anchor-bolts of approximately 550 small bore anchor calculations. However, the factor of safety of related stress allowables used in the design appear to be conservative enough to maintain the validity of the engineering calculation results.

The calculations are used to design base plates at the seismic /nonseismic boundary of systems.

Safety Impact The safety impact of this condition is indeterminate; however, it is anticipated that reanalysis would demonstrate that an actual safety condition does not exist.

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Root Cause

,'A No root-cause has bee.n determined for this condition.

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Corrective Action 4

The following corrective actions are necessary to tesol've this condition:

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1) Determine specifically which stuall bcr.4 anchor calculations are affected by this candition.

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2) Choose a 10% sample and : review the calculations for the specific effect of the incorrect intensification factor.

3) Determine whether an adverse safety impact exists from the results of item 2, above.

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4) Determine root cause and take action to prevent recurrence.

5) Document and resolve known nonconforming conditions.

The above corrective actions will not be pursued and no further reports on this subject will be made unless the Midland Energy Center Project is reactivated. This item will be entered in our Correspondencs and Commitm.nt Management System for long-term tracking.

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