RBG-31450, Forwards Reactor Containment Bldg Integrated Leakage Rate Test Types A,B & C Periodic Test

From kanterella
Jump to navigation Jump to search
Forwards Reactor Containment Bldg Integrated Leakage Rate Test Types A,B & C Periodic Test
ML20246M684
Person / Time
Site: River Bend Entergy icon.png
Issue date: 08/31/1989
From: Booker J
GULF STATES UTILITIES CO.
To:
NRC OFFICE OF INFORMATION RESOURCES MANAGEMENT (IRM)
Shared Package
ML20246M689 List:
References
RBG-31450, NUDOCS 8909070228
Download: ML20246M684 (2)


Text

, . -_ -- - _

Q :.~~ -. '

Q 7

^ GULF l STATES UTILETIES COMPANY RIVER DEND STATION ' POST OFFICE BOX 220 - ST FRANCISVILLE.LOutssANA70775

' AREA CODE $04 - $35-6094 346< B651 August 31, 1989-RBG- 31450 File Nos. G9.5, G12.14 U.'.S. Nuclear Regulatory Comnission' Document Control Desk Washington, D.C. 20555

- Gentlenen: -

River Bend Station - Unit 1 Docket No. 50-458 g_' Pursuant to-'.10CFR50; Appendix' J, Paragraph V.B, Gulf States Utilities Cmpany provides its River Bend Station (RBS) " Reactor Containment Building -Integrated Ieak . -Rate Test" report as

-Attachment 2.to thismletter. This Type A leak rate test was empleted on May 29, '1989. .As required by Paragraph V.B.3, a separate sumnary report of leakage' test results which failed to' meet L the acceptance criteria of 10CFR50, Appendix J is provided as' Attachment 1 to this letter. The periodic retest schedule ~for canain=nt leakage will continue .to follow the criteria set forth in 10CFR50, Appendix J, Paragraph III.D.

Sincerely, j,E.Aen4 J. E. Booker Manager-River Bend Oversight River Bend Nuclear Group

. Attachments cc: U. S. Nuclear Regulatory Coanission Region IV 611 Ryan Plaza Drive;' Suite 1000

. Arlington, TX 76011

.NRC Senior Resident Inspector P.O. Box 1051 St. Francisville, IA 70775 h0Iq 1\

8909070-282 890831 PDR ADOCK 05000458 p PDC x_ _ -

r" $

l ATI7CMENT I Smmary of Test Results That Failed to Meet hyuuau Criteria of 10CFR50, Appendix J As required by 10CTR50, Appendix J, Paragraph V.B.3, this attachment provides the supplemental information for test results which failed to meet the acceptance criteria of 10CFR50, Appendix J. The penetrations and their least squares fit analyses, are identified on Attachment 4B contained in Attachnent 2 to the cover letter. The penetrations those mininum pathway leakage rate was greater than the limts of 10CPR50, Appendix J were Z52A and Z52B. In addition to these two service water penetrations which experienced leakage greater than the applicable limits on both isolation valves, three penetrations (Z3A, Z19 and Z53B) experienced leakage in excess of 0.6 La for part of the isolation capability. However, the minimum pathway leakage rate for these penetrations remained well below 0.6La.

The as-left Integrated Leakage Rate Test (ILRT) met all acceptance criteria as delineated in the " Reactor Containment Building Integrated Leakage Rate Test" report. However, due to the as-found leakage rate condition of service water penetrations Z52A and 252B, the as-found condition of the containment exceeded the allowable accident leakage rate (Lr) . The root cause of the measured leakage of the service water penetrations was due to a buildup of corrosion products from the service water system. Service water system corrosion is the subject of Gulf States Utilities Canpany's (GSU) LER 89-011 dated April 20,1989 (reference RBG-30570), Revisions 1 and 2 dated May 24, 1989 and June 30, 1989, respectively, (reference RBG-30947 and RBG-31185) and GSU's informational report dated May 22, 1989 (reference RBG-30927). The as-found leakage rate exceeded the range of the test equipnent. Therefore, an instrumentation error analysis required by 10CFR50, Appendix J, Paragraph V.B.3 would not provide any additional information of benefit. GSU nttributes the cause of the measured leakage rates for these penetrations to be the service water system corrosion and not related to the structural condition of the containment as tested by the ILRT. Therefore, River Bend Station (RBS) sutraits the following corrective action plan as required by 10CFR50, Appendix J.

Specific corrective action is being taken with respect to the condition of the service water system in lieu of an accelerated frequency ILRT. The service water penetrations which have demonstrated a past history of leakage rates greater than the applicable limits will be subjected to increased frequency local leakage rate testing while corrective actions are being evaluated. Additionally, chemical cleaning of service water system piping is being evaluated. Further infomation on the RBS service water corrosion program can be found in LER 89-011, its revisions and GSU's informational report dated May 22, 1989.

- _ _ _ _ _ _ _ _