3F0688-02, Responds to Generic Ltr 88-05, Boric Acid Corrosion of Carbon Steel Reactor Coolant Pressure Boundary Components in PWR Plants. Schedule for Pilot Program to Inspect,Identify, Evaluate & Repair Leakage or Corrosion Provided

Responds to Generic Ltr 88-05, Boric Acid Corrosion of Carbon Steel Reactor Coolant Pressure Boundary Components in PWR Plants. Schedule for Pilot Program to Inspect,Identify, Evaluate & Repair Leakage or Corrosion Provided

ML20155A452
Person / Time
Site:	Crystal River
Issue date:	06/01/1988
From:	Widell R FLORIDA POWER CORP.
To:	NRC OFFICE OF ADMINISTRATION & RESOURCES MANAGEMENT (ARM)
References
3F0688-02, 3F688-2, GL-88-05, GL-88-5, NUDOCS 8806100075
Download: ML20155A452 (4)

Text

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Power C0RPORATION June 1, 1988 3F0688-02 Document Control Desk U. S. Nuclear Regulatory Commission /

Washington, D. C. 20555 j

Subject:

Crystal River Unit 3 Docket No. 50-302 Operating License No. DPR-72

Response to Generic Letter 88-05

Boric Acid Corrosion of Carbon Steel 4

Reactor Coolant Pressure Soundary, Components in PWR Plants

Dear Sir:

Pursuant to the 10CFR50. 54 ( f) request in Generic Letter 88-05, Florida Powe.r Corporation (FPC) is subuitting the following information.

FPC established a task force in April 1987 to evaluate the potential for boric acid leakage in the reactor coolant p ressure boundary.

The task force effort led to the development of a pilot program which was implemented during the last refueling outage in order to gather data on the extent and effects of boron corrosion on the primary system components. Preventative Maintenance Procedure PM-168, titled, "Visual Observation Check for Boron Corrosion on Threaded and Flanged Connections on the High Pressure Primary Side" was implemented as the first step in establishing a comprehensive boric acid corrosion inspection program. A representative sample of threaded and flanged connections in several locations were visually inspected for evidence of boron leakage or corrosion. No boric acid leakage was found which could potentially affect the reactor ccolant m pressure boundary. Components inspected were located on the reactor e o) vessel, pressurizer, steam generators, reactor coolant 7 pumps, and at

$ various valves and instrument connections in the Reactor Coo $,'nt and g support system piping. Fifty-five specific areas were vacually co inspected. Insulation was removed as required. PM-16S also 88 included instructions to implement repair 'on any components that X U1 were determined to be in immediate need of' corrective action. The I o o) information and experience gained from PM-168 is being GJcd to

$$ formulate a comprehensive boric acid corrosion damage prevention egg program. This program will consider the programmatic elements /g 88~N Tl Post office Box 219

• Crystal River, Florida 32629 + Telephone (904) 795-3802 l A Florida Progress Company l

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l 1 identified in the generic letter. Florif ji Pr.4.er Corporation will l impilement this program during Refuel VII ihich l is presently I scheduled for September 1989. fl , { j )

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The goal of ;FPC's program will be to Wientify, inspect, evaluate,, , j and repair as necessary any primary coolant leakage and/or resultant corrosion damage that has the potential of degrading the primary prusure boundary. In order to identify all the potential sources of> reactor coolant leakage, an extensive' review of the flow diagrams will' be pceformed. Upon verification that all potential sources of  ;

leakage have blan identified, the various piping drawings will be used to physically locate the potential leakage sources and leakage paths insid.//r.he Reactor Building. This information will be uhd to formulate aa inspection plan. The plan will address personnel accessibility requirements such as scaffolding and insulation removal, and personnel safety requirements, including AUM concerns.

The program requirements will ensure that any identified leakage  ;

paths will be thoroughly evaluates by Engindering for potential '

d vage resulting from boron corrasion. Thi:t evaluation could I invgive repair or replacement of hardware if tM mar,erial is found to be degraded. The list of potential leakage sources will be reviewed to determine the need for additior al spare parts and

. materials to repair leaks when they are found.

> Upon completion of the Refuel VII progrrm, a complete revidW of the

, inspection results and corrective actions taken will be performed.

The purpose of,this review will be to formulate a long-term plar,'for boric ' acid corrosior. j hunge prevention. Post Refuel VII inspeqtion requirements, Andud.'ng Pcliorities and inspection intervals, will be ,,l based upon th po'tantidl consequences of corrosion damage, past ,,t performance of componenth previously inspected, accessibilitv.;and s  :

personnel safo y. Design changes or op3 rating procedure enchges '

will be consitlered to minimize the need for future inspecticarqand maintenance activities. '

the following is a schedule for implementation of the program described above: /

Milestone Date

1. Complete prelip.,inary draft of damdse 5/31/89 prevention progras I , t t

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June 1, 1988 3F0688-02 Page 3 Milestone Date l

2. Issue final version of Boric Acid 7/31/89 L Corrosion Damage Prevention Program

3. Implement Program 9/30/89 (Refuel VII)

4. Formulate long-term plan for Boric Acid 12/30/90 Corrosion Damage Prevention Sincerely, p I l h R. C. Widell, Director Nucleat Operations Site Support RCW/JWT/sdr xc: Dr. J. Nelson Grace Administrator, Region II Mr. T.F. Stetka Senior Resident Inspector l

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STATE OF FLORIDA COUNTY OF CITRUS I

R. C. Widell states that he is the Director, Nuclear Operations Site Support for. Florida Power Corporation; that he is authorized on the  !

part of said company to sign and file with the Nuclear Regulatory Commission the information attached hereto; and that all such statements made and matters set forth therein are true and correct to the best of his knowledge, information, and belief.

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1 R. C. Widell, Director Nuclear Operations Site Support Subscribed to before me, a Notary Public in and for the State and l County above named, this 1st day of June 1988.  ;

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_wn MSU otary Public Notary Public, State of Florida at Large My Commission Expires:

NOTARY PUBLIC, STATE OF FLORIDA.

OM ED T RW NOTART PWO C ER R T E R S.

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