HNP-96-023, Clarifies Commitments Re Macroscopic Biological Fouling
| ML18012A215 | |
| Person / Time | |
|---|---|
| Site: | Harris  |
| Issue date: | 04/16/1996 |
| From: | Robinson W CAROLINA POWER & LIGHT CO. |
| To: | NRC OFFICE OF INFORMATION RESOURCES MANAGEMENT (IRM) |
| References | |
| HNP-96-023, HNP-96-23, NUDOCS 9604190355 | |
| Download: ML18012A215 (5) | |
Text
CATEGORY 1 REGULAT INFORMATION DISTRIBUTION STEM, (RIDS)
ACCESSION NBR:9604190355 DOC.DATE: 96/04/16 NOTARIZED:
NO FACIL:50-400 Shearon Harr~is Nuclear Power Plaat, Unit 1, Carolina AUTH.NAME AUTHOR AFFILIATION ROBINSON,W.R.
Carolina Power 6 Light Co.
RECIP.NAME RECIPIENT AFFILIATION Document Control Branch (Document Control Desk)
SUBJECT:
Clarifies commitments re macroscopic biological fouling.
DISTRIBUTION CODE:
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Carolina Power & Light Company PO Box 165 New Hill NC 27562 APR 16 1996 William R. Robinson Vice President Harris Nuclear Plant SERIAL: HNP-96-023 United States Nuclear Regulatory Commission ATTENTION: Document Control Desk Washington, DC 20555 SHEARON HARMS NUCLEARPOWER PLANT DOCKET NO. 50-400/LICENSE NO. NPF-63 CLAMFICATIONOF COMMITMENTSREGARDING MACROSCOPIC BIOLOGICALFOULING Gentlemen:
Carolina Power 8c Light Company (CPAL) has made prior commitments regarding actions to be taken in response to macroscopic biological fouling, primarily Corbicula (asiatic clams), at the Harris Nuclear Plant (HNP). The initial commitments were made in CP&L responses to NRC IE Bulletin 81-03 (flowblockage ofcooling water to safety components) submitted on July 10, 1981 and March 25, 1983 and were partially reflected in the HNP Environmental Report, Amendment No. 4 (October 1982), and Final Environmental Statement (October 1983). The commitments focused primarily on inspection, sampling, chlorination and flushing ofthe Service Water and Fire Protection Systems and the potential use ofoxygen scavenging chemicals in the intake bays.
On January 26, 1990 CPAL submitted a response to Generic Letter 89-13 (service water system problems affecting safety-related equipment) which also contained commitments related to macroscopic biological fouling. These commitments focused primarily on inspection, sampling, chlorination (or equivalent treatment) and flushing ofthe Service Water System.
These commitments were made prior to discovering asiatic clams in the intake bays.
The original Service Water System gaseous chlorine system has since been replaced by an intermittent chlorination system using sodium hypochlorite. The Fire Protection System is not chlorinated.
Furthermore, there are presently no plans to use oxygen scavenging chemicals in the intake bays.
In April 1994 an asiatic clam was collected from the intake bays ofboth the main and auxiliary reservoir intake structures.
In August 1994 approximately 50 asiatic clams were discovered in an Emergency Service Water (ESW) intake traveling screen backwash channel strainer basket.
Although additional asiatic clams have been discovered during subsequent inspections in the intake structure bay's (both upstream and downstream ofthe traveling screens), none have been discovered in downstream heat exchangers.or piping ofthe Service Water System.
The current practice for controlling macroscopic biological fouling is to perform routine intermittent chlorination ofthe Service Water System, combined with flushing and other non-chemical techniques (e,g., mechanical cleaning and removal ofthe clams inghy iitgge bays).
- Likewise, 96041'gt0355 960416 3.8~U r, PDR ADQCK 05000400 P
PDR State Road I
1 )4 New tltn rqC Tel 919 362-2502 Fax 919 362-2095
Document Control Desk HNP-96-023/ Page 2 there has been no evidence ofasiatic clams in the Fire Protection System during flushing and inspection evolutions; therefore, chlorination ofthis system has not been necessary.
Therefore, CPS'esires to clarify/revise the previous commitments related to macrobiological fouling to reflect our current practices as discussed above:
Plant Program document PLP-620, Service Water Program (Generic Letter 89-13), is the controlling document for Service Water macrobiological fouling. This program presently contains requirements for intake structure inspection, ESW component inspection, periodic flushing ofinfrequently used loops, and layup ofESW cooling loops. Aside from the present practice ofroutine intermittent chlorination ofthe Normal Service Water and Circulating Water Systems, there is no plan to separately chlorinate the intake bays or redundant/stagnant loops ofthe ESW System.
With respect to the Fire Protection System, several ofthe above elements are already being accomplished even though they are not programmatically linked to a macrobiological fouling program. In order to enhance our efforts, a program willbe established which consolidates intake bay inspection and/or cleaning (similar to the Service Water bays), as well as periodic flushing, sampling, and inspection as part ofthe maintenance ofthe Fire Protection System.
As stated above, there is presently no plan to separately chlorinate the Fire Protection intake bays or system.
Based upon inspection results and future industry experience, additional actions willbe initiated as necessary to minimize the adverse impact ofmacrobiological fouling on Service Water and Fire Protection Systems.
These actions may include chemical and/or non-chemical (e.g., mechanical cleaning) methods consistent with treatment effectiveness, environmental impact, and other pertinent factors.
The above commitments willallow CP&L to utilize the latest technological advances and industry developments while maintaining compliance with NRC requirements in the control and treatment ofmacrobiological fouling.
These commitments are intended to supersede any prior commitments related to the control of macroscopic biofouling species.
Questions regarding this matter may be referred to Mr. T. D. Walt at (919) 362-2711.
Sincerely, RWP/rwp c:
Mr. J. B. Brady Mr. S. D. Ebneter Mr. N. B. Le
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