ML20041E335

Updated Interim Part 21 Rept Re Incomplete Hydraulic Analysis of Control Rod Drive Piping.No Pipe Routing Changes Required.Supports Require Mods for Unanticipated Transient Loads.Next Rept Expected by 820430

ML20041E335
Person / Time
Site:	Zimmer
Issue date:	02/25/1982
From:	Borgmann E CINCINNATI GAS & ELECTRIC CO.
To:	James Keppler NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION III)
References
REF-PT21-82-567-000 10CFR-50.55E, PT21-82-567, PT21-82-567-000, QA-1644, NUDOCS 8203100384
Download: ML20041E335 (2)

Text

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TIIII CINCINNNI'I GAS & ELECTRIC CONfl%NY sm -

CINCINNATI. OHIO 4c2OI February 25, 1982 QA-1644 E. A. BORG M A N N 5( NIOR VIC E PRE SIDE NT U. S. Nuclear Regulatory Commission Region III go) 799 Roosevelt Road j 4 Glen Ellyn, Illinois 60137 y

. -Q 9 Attention

Mr. J. G. Keppler, Director di '

-! q3 1982> -

RE: WM. II. ZIMMER NUCLEAR POWER STATION UNIT I [ g g m e mi ~.'y1 h 10CFR50.55(e) - ITEM M INCOMPLETE 7 J A Q ""

HYDRAULIC ANALYSIS OF CRD PIPING - DOCKET NO. 50-358, CONSTRUCTION PERMIT CPPR-88, W.0. #57300 JOB E-5590, FILE NO. NRC-8

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Gentlemen:

This letter is intended to update our interim report, QA-1509, dated January 20, 1982, concerning incomplete hydraulic analysis of Control Rod Drive (CRD) piping.

As stated in our previous report, initial evaluation determined that valve opening hydraulic transient loads (water hammer) may cause stress and unacceptably degrade the CRD piping and suspension systems reliability. Sargent & Lundy (S&L)

Engineers were contracted to perform a reanalysis of the CRD hydraulic systems for both dynamic and hydraulic transient loads.

At present, S&L has determined that no pipe routing changes will be required however, supports will require modification to accomodate previously unanticipated; transient loads. Piping support modifications based on Preliminary loads were issued to the field for construction on February 16, 1982.

Our next report, following completion of the piping analysis with final loads, will be submitted by April 30, 1982.

8203100384 820225 PDR ADOCK 05000358 S PDR

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Mr. J. G. Keppler, Director U. S. Nuclear Regulatory Commission Region III

February 25,'1982 - QA-1644 Page 2 We trust this letter will be.found acceptable as an interim report under 10CFR50.55(e) .

Very truly yours, THE CINCINNATI GAS & ELECTRIC COMPANY i

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E. A. BORGMANN SENIOR VICE PRESIDENT-MAP:ac i cc: NRC Resident Inspector

! Attn: W. F. Christianson NRC Office of Inspection & Enforcement Washington, D.C. .20555 l

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