ML20235U570
| ML20235U570 | |
| Person / Time | |
|---|---|
| Site: | Farley  |
| Issue date: | 03/03/1989 |
| From: | Hairston W ALABAMA POWER CO. |
| To: | NRC OFFICE OF INFORMATION RESOURCES MANAGEMENT (IRM) |
| References | |
| IEB-88-011, IEB-88-11, NUDOCS 8903090264 | |
| Download: ML20235U570 (3) | |
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Alabama Power Company 9-
- 40 inverness Contrr Parkway s a-Post Office Box 1295 Birmingham, Alabama 35201.
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Telephone 205 868-5581 W. G. Hairston, di '
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Senior Vice President
. Nuclear Operations AlabamaPower March 3, 1989 the southem ela.tre systerri
' Docket Nos. 50-348 50-364 U.fS. Nuclear Regulatory Commission ATTN: Document Control Desk Washington, D.~ C. 20555 Gentlemen:
Joseph M. Farley Nuclear Plant - Units 1 and 2 Alternative Schedule For Evaluation Of Pressurizer Surge Line Stratification On' January 3, 1989 Alabama Power Company received NRC Bulletin 88-11, j
" Pressurizer, Surge Line Thermal Stratification", requesting l
addressees to establish and implement a program to confirm l
pressurizer: surge.line integrity in view of the occurrence of thermal stratification'and inform the staff of actions taken to resolve this issue. The bulletin requested that an inspection be performed of the pressurizer surge-line at the next'available cold shutdown which exceeds seven days and perform an analysis to demonstrate'that the pressurizer. surge line meets applicable. design codes, FSAR and L
regulatory commitments. The schedule for performing these analyses is four. months after receipt of.the bulletin for. plants in operation
.over ten years and one year for plants in operation less than ten
= years.. Pursuant to satisfying the requirements and schedules of Bulletin 88-ll,, Alabama Power Company is participating in a program for partial resolution of this issue through the Westinghouse ~0wner's Group (V0G).. The V0G program was approved at the October 1988 meeting and has the following objectives:
Develop a generic Justification for Continued Operation (JCO) to assure that plant safety is not compromised while the effects of thermal stratification are being determined.
Collect and summarize relevant design, operational, u.alytical, and test data for as many V0G plants as possible.
In addition, a representative sampling of approximately ten plants-vill be selected to perform a review of plant recorde and conduct interviews with operations personnel.
Evaluate data, identify and prioritize sigrif ficant parameters contributing to this issue.
Plants will then be grouped based on these parameters.
Recommend additional monitoring to supplement the existing transient database required to bound all V0G plants.
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U. S. Nuclear Regulatory Commission ATTN:
Document Control Desk.
Page 2 Estimate the effect of thermal stratification on fatigue life as a function of key parameters.
Recommend short term and long term actions.
The WOG program is designed to benefit'from the experience gained-in the performance of several plant specific analyses on Westinghouse PWR surge lines. These detailed analyses included definition of revised thermal transients (including stratification) and evaluations of pipe stress, fatigue usage factor, thermal striping, fatigue crack growth,' leak before-break, and support loads. The overall analytical approach used in all of these analyses has been consistent and has been reviewed in detail by the NRC staff.
A significant amount of surge line thermal monitoring data has been obtained in support of these plant specific analyses. Additional surge line thermal monitoring,and plant system data continues to be made available within the WOG, resulting in a steadily increasing database..A significant amount of progress has been accomplished toward meeting these objectives.
To date, the WOG has completed approximately-80% of the effort of assembling plant specific design information on all domestic.
Westinghouse PWRs (S5 units total). This effort vill establish the range of key design parameters and permit grouping of plants based on these parameters.
Based on the information assembled to date, and the experience gained in plant specific analyses and monitoring programs, the WOG evaluation has resulted in a determination that the development of thermal stratification loadings, and the effects caused by such loadings, is a complex process.. Therefore, in order to precisely evaluate stratification, additional time is required.
To assure that plant safety is not compromised within the requested period of schedule extension, a JC0 vill be submitted to the staff.
The JCO, which is currently;being developed, will be submitted by Alabama Power Company to the staff by May 3, 1989 for Farley Nuclear Plant, Units 1 and 2.
The JC0 vill utilize the information, experience, and monitoring data obtained through the V0G program, and wi]l support the alternate schedule discussed herein.
j-Alabama Power Company hereby requests an alternate schedule.to that requested in Bulletin 88-11.
A schedule of two years from receipt of the Bulletin is considered sufficient time to obtain the necessary additional monitoring data, define thermal transients, perform all required analyses and update the stress and fatigue analyses to ensure compliance with applicable code and regulatory requirements.
.This schedule, though different from that requested in action 1.b of Bulletin 88-11, is consistent with the requirement to update the stress and fatigue' analyses within two years as stated in action 1.d of the Bulletin.
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U.,S. Nuclear Regulatory Commission ATTN:
Document Control Desk Page 3 At this time, Alabama Power Company's request for an alternate schedule applies only to item 1.b of NRC Bulletin 88-11.
Alabama Power Company intends to comply with all other requirements of the Bulletin.
1 If there are any questions, please advise.
Respectfully submitted, ALABAMA POWER COMPANY lt)..Y Y
V. G. Hairston, III VGH,III/RGV:mV.4.08 cc:
Mr. H. L. Ernst SVORN TO AND SUBSCRIBED BEFORE HE Hr. E. A. Reeves Mr. G. F. Maxwell THIS Vd DAY OF NaAck
,1989 LLes [ W Y ) 0
(/ Notary Public Hy Commission Expires:
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