ML17222A705

Responds to NRC Bulletin 88-011, Pressurizer Surge Line Thermal Stratification. Ongoing Surge Line Program to Collect Data from Plants Authorized.Nrc Agreed on Listed Action Items to Be Completed Based on Program

ML17222A705
Person / Time
Site:	Saint Lucie
Issue date:	03/06/1989
From:	Conway W FLORIDA POWER & LIGHT CO.
To:	NRC OFFICE OF INFORMATION RESOURCES MANAGEMENT (IRM)
References
IEB-88-011, IEB-88-11, L-89-82, NUDOCS 8903150005
Download: ML17222A705 (3)

Text

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ACCESSION NBR:8903150005 DOC.DATE: 89/03/06 NOTARIZED: NO FACIL:50-335 St. Lucie Plant, Unit 1, Florida Power

& Light Co.

50-389 St. Lucie Plant, Unit 2, Florida Power

& Light Co.

AUTH.NAME AUTHOR AFFILIATION CONWAY,W.F.

Florida Power

& Light Co.

RECIP.NAME RECIPIENT AFFILIATION Document Control Branch (Document Control Desk)

SUBJECT:

Responds to NRC Bulletin 88-011, "Pressurizer Surge Line Thermal Stratification."

DISTRIBUTION CODE:

IE11D COPIES RECEIVED:LTR ENCL SIZE:

TITLE: Bulletin Response (50 DKT)

NOTES':

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P.O. Box14000, Juno Beach, FL 33408-0420 MARCH 6

1989 L-89-82 U. S. Nuclear Regulatory Commission Attn:

Document Control Desk Washington, D.

C.

20555 Gentlemen:

Re:

St. Lucie Units 1 and 2

Docket Nos.

50-335 and 50-389

Response

to NRC Bulletin No. 88-11 Pressurizer Sur e Line Thermal Stratification As requested by the subject NRC Bulletin, the purpose of this letter is to inform the staff of actions taken to resolve NRC concerns associated with the issue of pressurizer surge line

'thermal stratification.

The Combustion Engineering Owners Group (CEOG) became aware of this issue in April 1987 when INPO issued a draft SER on surge line thermal cycling observed in a German nuclear plant.

The CEOG proceeded to initiate a data collection program in June 1987 followed by actual data collection activities at two CEOG plants in June and August 1988.

In October

1988, the CEOG authorized the ongoing CEOG program "Reduction and Analysis of Pressurizer Surge Line Data Collected from CEOG Plants",

to address surge line thermal stratification concerns.

NRC Bulletin 88-11 was subsequently issued in December 1988.

Action No. 1.b requested that, within four months of receipt of the Bulletin, licensees of plants in operation over ten years demonstrate that the pressurizer surge line meets the applicable design codes and other regulatory commitments for the licensed life of the plant.

The Staff suggested that this could be accomplished by performing a plant specific or generic bounding analysis.

Licensees of plants in operation less than ten years were requested to complete the analysis within one year.

]~iOOOb F Ij:t WP A

gg(J an fPL Grou,". conloui.,

U. S. Nuclear Regulatory.Commission L-89-82 Page two The NRC Staff and the CEOG met on February 13, 1989.

During this meeting, the CEOG presented the goals and-scope of the ongoing GEOG surge line program which included a presentation of actual plant data and a discussion on the issue of thermal striping.

The CEOG then requested relief from the four month/one year schedule requirement in Requested Action 1.b and suggested that the CEOG program be allowed to proceed as scheduled.

As a result of this meeting, the CEOG and NRC Staff agreed on

.several action items to be completed as follows:

The CEOG will perform a preliminary bounding evaluation of CEOG surge lines using actual data collected from CEOG plants by July 1, 1989.

This activity will address the intent of Requested Action 1.b.

2.

Actual plant data will be used to define loading conditions for input to the fatigue and 'stress evaluations.

3.

The CEOG agreed to meet with NRC staff to discuss the load definitions prior to finalizing the bounding analysis described in item 1 above.

Florida Power

& Light Company is participating in the CEOG program for St. Lucie Units 1 and 2 and agrees to support the above action items and alternative schedule for responding to NRC Bulletin 88-11 Action 1.b.

Reporting Requirement 2

in the Bulletin is considered to be appropriately addressed by this letter.

Very truly yours, p+zc~~

W. F.

Co y

Senior V' President Nuclear WFC/MSD/re cc:

Stewart D. Ebneter, Regional Administrator, Region II, USNRC I

Senior Resident Inspector, USNRC, St. Lucie Plant