ML20205R312
| ML20205R312 | |
| Person / Time | |
|---|---|
| Site: | Farley  |
| Issue date: | 04/01/1987 |
| From: | Mcdonald R ALABAMA POWER CO. |
| To: | NRC OFFICE OF INFORMATION RESOURCES MANAGEMENT (IRM) |
| References | |
| NT-87-0132, NT-87-132, NUDOCS 8704060309 | |
| Download: ML20205R312 (3) | |
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Ahbama Power Company NT 87-0132 600 North 18th Street Post office Box 2641 Birmingham Alabama 35291-0400 Telephone 205 250-1835 in"00,"Coe,,
AlabamaIbwer the sournem ekxtrc system April 1, 1987 U. S. Nuclear Regulatory Conunission Attention: Document Control Desk Washington, D. C. 20555
SUBJECT:
J. M. Farley Nuclear Plant NRC Inspection of August 25-28, 1986 RE: Report Number 50-348/86-18 Report Number 50-364/86-18
Dear Sir:
his letter refers to your request for a supplemental response to the Notice of Deviation cited in the subject inspection reports.
With regard to your concerns that the chlorination program currently being conducted at Farley Nuclear Plant may not be effective, the following description of the experimental program, results, and compensatory measures are provided:
1.
The experimental service water Corbicula control program consists of treating the units separately with a biocide, three times per year per unit as a minimum. W e duration of each treatment period will be a maximum of eight weeks or until 90% mortality of Corbicula indicator organisms is achieved, whichever occurs first.
During time periods when the experimental program cycle of continuous chlorination is not in effect, the chlorination program described in the FSAR is maintained in effect.
2.
We continuous chlorination of Unit 1 service water from October 28 through December 5,1986 produced an average mortality for adult Corbicula clams of 90% in four weeks and 98% in five weeks as determined by observing side stream aquaria located downstream of the last component of concern.
3.
We chlorination concentrations used for the experimental program have been approved by the Alabama Department of Environmental Management on a temporary basis. Permanent implementation of this chlorination program will require proof that the chlorine discharge levels associated with it are the minimum necessary to control Corbicula to a level that prevents detectable fouling of service water components C704060309 870401 Q
PDR ADOCK 05000348
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i U. S. Nuclear Regulatory Conunission April 1, 1987 j
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as opposed to total elimination of corbicula. We objective of the experimental program is to demonstrate the minim a levels for a j
permanent program.
i 4.
We only identified fouling of service water components with operational consequences in which corbicula have been considered a contributory cause has been the charging pump oil coolers.
i he Unit I charging pump oil coolers have been converted to
,I component cooling water. During the next refueling outage the Unit 2 charging pump oil coolers will be converted to component a
l cooling water.
5.
We following compensatory measures are being implemented until a l
permanent chlorination program that is effective against Corbicula is J
established:
a.
Unit 1 charging pump oil coolers have been converted to component cooling water.
l b.
Unit 2 charging pump oil cooler will be converted to component cooling water during the next refueling outage.
)
c.
Unit 2 charging pump oil cooler temperatures are monitored at i
least once each shift for indications of fouling. Criteria based 1
on oil temperature trends have been established for inspecting and cleaning charging pump oil coolers. Unit 2 off-service i
charging pumps are operated once each week for t.he purpose of monitoring oil cooler temperature to detect fouling.
j l
d.
Service water wet pits are periodically inspected and cleaned if necessary.
(
Service water heat exchangers opened for routine and preventative j
e.
1 maintenance will be inspected to determine if corbicula fouling i
is present.
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f.
During cycles of continuous chlorination used in the experimental program, increased vigilance and surveillance will be exercised i
to identify possible fouling due to increased clam mortality. As of this date there does not appear to be a sufficient number of i
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U. S. Nuclear Regulatory Comunissica April 1, 1987 Page 3 clans within the Unit 1 service water system to cause observable performance degradation during or followfog a continuous chlorination cycle.
Yours very truly
'fW
(?w R. P. Mcdonald RPM:emb cct Mr. L. B. Long Dr. J. N. Grace Mr. E. A. Reeves Mr. W. H. Bradford Mr. J. P. Martin ii