ML20082E407
| ML20082E407 | |
| Person / Time | |
|---|---|
| Site: | Braidwood  |
| Issue date: | 07/25/1991 |
| From: | Taylor D COMMONWEALTH EDISON CO. |
| To: | NRC OFFICE OF INFORMATION RESOURCES MANAGEMENT (IRM), Office of Nuclear Reactor Regulation |
| References | |
| GL-89-13, NUDOCS 9108010003 | |
| Download: ML20082E407 (7) | |
Text
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Downers Grove, Illinois 60515 July 25,1991 Office of Nuclear Reactor Regulation U.S. Nuclear Regulatory Commission Washington, D.C. 205$5 Attn: Document Control Desk
Subject:
Braidwood Units 1 and 2 Supplemental Response to Generic Letter 89-13 NRC_RocketNosm50:373_and50-37_4
References:
(a) NRC Generic Letter 89-13, dated July 18,1989.
(b) M.H. Richter letter to the NRC dated January 29,1990.
(c) D. Taylor letter to the NRC dated November 14,1990.
Dear Sir:
NRC Generic Letter 89-13 (Generic letter) indicated that recent operating experience and studies had raised concerns about service water systems in nuclear power plants. The Generic Letter requested licensees to take actions which would ensure that their service water systems were in compliance with, and would be maintained in compliance with,10 CFR Part 50, Appendix A, General Design Criteria 44,45, and 46 and Appendix B,Section XI. Additionally, the Generic Letter required a response which would confirm that each licensee had established programs to implement the recommended actions of the Generic Letter, or that equally effective actions had been pursued. References (b) and (c) provided Commonwealth Edison's (CECO) response for Dresden, Quad Cities, Zion, LaSalle County, Byron and Braidwood Stations to Generic Letter 89-13.
The purpose of this letter is to notify the NRC that all the actions committed to by CECO in response to Generic Letter 89-13 have been completed for Braidwood Station Unit 1. The attachment to this letter outlines those actions taken.
9108010000 no725 PDR ADOCR 05000373 P
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U.S NRC July 25,1991 Please direct any questions that you may have concerning this response to this office.
Respectfully, D.L. Taylor Generic issues Administrator Attachment cc: A.B. Davis - Regional Administrator, Region lil R. Pulisfer - Pro]ect Manager - NRR Resident inspectors Braidwood
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Implement and maintain an ongoing program of surveillance and control techniques to significantly reduce the incidence of flow blockage problems as a result of biofouling.
CEcoACIJONS New or existing procedures were implemented during the Unit 1 refuel outage to measure macroscop!c biological fouling organisms, identify excessive sedimentation and to inspect for concrete degradation. All results were acceptable.
The modification to add sodium bromide to the existing sodium hyaochlorite in ection system is on hold awaiting authorization from the State o" lilinois E vironmental Protection Agency (EPA) for bromine additions. This authorization is contingent on the Federal EPA issuance of guidelines regarding bromine additions.
Where possible new procedures have been put in place or existing procedures have been revised to require and document periodic flushing, flow testing or inspection of infrequently used or stagnant lines in the SX system.
ZNLD/1058/1
GL89-13JIEMJl Conduct a test program to verify the heat transfer capability of all safety-related heat exchangers cooled by service water. The total program should consist of an initial test program and a periodic retest program.
Ceco.ACILONS Safety related heat exchanger inspections and/or tests have been completed for Unit 1 with the exception of the Unit 1 train B diesel generator jacket water cooler which was not tested or inspected based on the train A test and inspection results. Additionally 2 out of 4 RCFC units were accepted based on the test results of the 2 remaining RCFC units. The airside of all 4 units was cleaned.
The Station has instituted a long-term program to ensure periodic testing, inspection and cleaning of safety-related heat exchangers.
ZNLD/1058/2
GkB94alIEMlli Ensure by establishing a routine inspection and maintenance program for open-cycle service water system piping and components that corrosion, erosion, protective coating failure, silting, and biofouling cannot degrade the performance of the safety-related systems supplied by service water. The maintenance program should have at least the following purposes:
A.
To remove excessive accumulation of biofouling agents, corrosion products, and silt; B.
To repair defective protective coatings and curroded service water system alping and componerits that could adversely affect performance of their ntended safety functions.
CEGo_ARIlONS:
High flow and low flow plaing locations were identified and incorporated into Station procedures, whic1 determine wall thinning aroblems by ultrasonic inspection at the specified locations. The specifiec locations were selected based upon their susceptiblity to high flow erosion or low flow fouling and corrosion. The Unit 1 procedure was performed during the Unit 1 refueling outage with satisfactory results.
The modification to install corrosion monitoring equipment is expected to be complete in the fourth quarter of 1991.
ZNLD/1058/3
G.kB9-13lTEMR Confirm that the service water system will perform its intended function in accordance with the licensing basis for the plant. Reconstitution of the design basis of the system is not intended. This confirmation should include a review of the ability to perform rec uired safety functions in the event of failure of a single active component. To ensure that the as-built system is in accordance with the appropriate licensing basis documentation, this should include recent system walkdown inspections.
CEcoACIlONS A design review was performed on the open and closed safety related service water system. The design review consisted of the following:
- System Configuration Review
- Single Failure of Active Component Revier.
- Field Verification of P&lDs
- Flood Protection Review
- Pipe Support Review The design review has been completed for both Units 1 and 2.
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g-GL 89-13JIEM_V Confirm that the maintenance practices, operating and emergency procedures
- and training that involves the service water system are adequate to ensure 7that safety-related equipment cooled by the service water system'will function -
as intended and that operators of the equipment will perform effectively.
CECO _AC_TJONS A review of maintenance practices, operating and emergency procedures and training with regards to the adequacy of the service water systems has been -
completed.: No major discrepancias were identified. ' All minor discrepancies are being evaluated to determine any required corrective action.
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1 ZNLD/1058/5
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