ML20004E989
| ML20004E989 | |
| Person / Time | |
|---|---|
| Site: | Brunswick  |
| Issue date: | 05/26/1981 |
| From: | Furr B CAROLINA POWER & LIGHT CO. |
| To: | James O'Reilly NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II) |
| References | |
| IEB-81-03, IEB-81-3, NO-81-892, NUDOCS 8106160303 | |
| Download: ML20004E989 (2) | |
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File: NG.3513(B)
May 26, 1981'm Serial No.: NO-81-892 i! Jp! I p1*
p \\ Olh Mr. James P. O'Reilly, Director N' '
U. S. Nuclear Regulatory Commission
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Region II, Suite 3100
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LICENSE NOS. DPR-71 AND DPR-62 DOCKET NOS. 50-325 AND 50-324 RESPONSE TO IE BULLETIN 81-03 M I',
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Dear Mr. O'Reilly:
In response to your letter of April 10, 1981, transmitting IE Bulletin 81-03, Flow Blockage of Cooling Water to Safety System Components by Corbicula (Asiatic class) and Mytilus (Mussel), Carolina Power & Light Company submits the following response for the Brunswick Steam Electric Plant (BSEP):
Corbicula does occur in the Cape Fear River f;om which the Brunswick Plant takes its cooling water; however, they are not found at BSEP due to the high salinities normally found there. Mytilus, oysters, barnacles, hydrozoans, and bloed arks (Anadara ovalis) have been found in the circulating water and service water system piping.
The Fire Protection System at BSEP uses well water and therefore is not affected by any of the shellfish problems.
As required in Item 2 of this bulletin and to satisfy a commitment made in LER 2-80-30, the Unit No. 1 RRR heat exchangers were examined to determine if a shell problem and/or a divider plate problem existed in these heat exchangers. This inspection determined that shells were present in both heat exchangers and that the divider plates in both were bowed, causing separation between the divider p]r~= and The deform ion was the head, thus allowing flow to bypass the tubes.
caused by shell blockage of the tubes causing a high service water differential pressure across the plate. An investigation on the Unit No. 2 RHR heat exchangers determined the same shell problem existed; however, only the 2B baffle was found to be bowed.
The occurrence of shell growth is not a new issue at Brunswick.
The present problems were a result of our loss of capability to continu-ously and effectively chlorinate the service water system due to electrical and mechanical problems with the system and the need to stop chlorine carryover into the screen wash system due to environmental concerns.
Without the chlorination system in service, shellfish growth, mainly 76//
oysters, propagated in the concrete lined carbon steel service water Shells broken off by service water flow were carried to the RRR heat exchangers where they caused the partial blockage. No growth
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was noted inside the copper-nickel heat exchangers.
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e Due to the problems noted with shells in the RHR heat exchangers, the heat exchangers for the diesel generators and the 1A core spray room cooler as well as the nuclear and conventional headers were inspected for shells and/or shell growth. Both service water headers were found to have approximately 1007. growth coverage on the concrete lined piping.
Shell growth was not detected in the diesel generator heat exchangers (four) or the core spray room cooler heat exchanger; however, approximately one hand full of broken shall fragments were found in each of these heat exchangers.
This did not affec:: the operability of these heat exchangers.
To ensure that problems of this magnitude do not again develop, the plant engineering performance group has been tasked to develop a monitoring / testing program to periodically monitor the performance of safety-related heat exchangers. This program is now in the developmental stage. Following the completion of all inspections, cleaning, and repairs as required, the, monitoring /te, ting program will be finalized and a supple-ment to this response will be submitted describing the program.
Inspections and evaluations are still in progress which are requi*.ed to more comprehensively address the items of this bulletin.
Following these inspections and evaluations, a supplemental response will be submitted to more fully address each item of this bulletin.
The manpower expended in the review and preparation of this report was approximately 2500 hours0.0289 days <br />0.694 hours <br />0.00413 weeks <br />9.5125e-4 months <br /> and is continuing.
Yours very truly,
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J. Furr Vice President Nuclear Operations i
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Mr. Victor Stello, Jr.
B. J. Furr, having.been first duly sworn, did depose and say that the information contained herein is true and correct to his own personal knowledge or based upon information and belief.
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