ML20248A445
| ML20248A445 | |
| Person / Time | |
|---|---|
| Site: | Seabrook  |
| Issue date: | 09/22/1989 |
| From: | Feigenbaum T PUBLIC SERVICE CO. OF NEW HAMPSHIRE |
| To: | NRC OFFICE OF INFORMATION RESOURCES MANAGEMENT (IRM) |
| References | |
| NYN-89117, NUDOCS 8910020221 | |
| Download: ML20248A445 (2) | |
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Newhar6pshire Yankee NYN-89117 September 22, 1989 l
United States Nuclear Regulatory Commission j;
Washington, DC.20555 l?
- Attention
- ' Document Control' Desk
References:
(a)
Facility Operating License NTF-67 Docket No. 50-443 (b)
PSNH Letter SEN-970, dated March 18, 1986, Seabrook Station " Fire Protection Program," J. DeVincentis to I. J. Miraglia.
(c)
PSNH Letter SBN-1193, dated September 17, 1986, "Seabrook HVAC Charcoal Filters Fire Protection," J. DeVincentis to V. S. Noonan.
(d)
PSNH Letter SBN-1208, dated October 9, 1986, "Seabrook HVAC Charcoal Filter Fire Protection," J. DeVincentis to V. S. Noonan.
(e)
New Hampshire Yankee Letter NYN-88007, dated January 22, 1988, " Proposed Modification to Control Building HVAC (CBA) System," from G. S. Thomas to USNRC.
Subject:
Seabrook HVAC Charcoal Filter Fire Protection Gentlemen The " Hazards Analysis of Seabrook Station Charcoal Filter Units" was submitted to the NRC by letter dated October 9, 1986 [ Reference (d)).
Markups of Seabrook's Fire Protection Program Evaluation and Comparison to BTP APCSB 9.5-1, Appendix A and Fire Protection of Safe Shutdown Capability, 10CFR50, Appendix R, were provided therein.
To support certain bases of the fire hazards analysis, New Hampshire Yankee (NHY) committed to install a carbon monoxide fire detection system for Seabrook's charcoal filters. The design and installation of these modifications has essentially been completed with the exception of those detectors associated with the Control Building HVAC (CBA) System
[ Reference (e)]. Du;'ng preoperational calibration and testing, the carbon monoxide detection system has not performed in accordance with the design specifications.
The system has exhibited excessive drift, inadvertent alarms, and unacceptable reliability.
G910020221 890922 h
POR ADOCK 05000443 F
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New Hampshire Yankee Division of Public Service Company of New Hampshire P.O. Box 300
- Seabrook, NH 03874
- Telephone (603) 474-9521 a
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.. N United States Nuclear Regulatory Commission September 22, 1989 Attention: Document Control Desk Page 2 NHY has conducted testing and has had subsequent discussions with the vendor. Since the solid state carbon monoxide sensors are so sensitive to air flow and a broad spectrum of interference gases, NHY has concluded that the sensors are inappropriate for this application.
Solid state sensors were originally selected in lieu of other carbon monoxide detection technologies. (e.g. electrochemical or infrared), because of less frequent calibration and changeout requirements.
t In order to resolve this problem and to assure reliability of the system, NHY intends to install electrochemical carbon monoxide sensors.
Preliminary testing has demonstrated that the electrochemical sensors are more reliable than the solid state system. The proposed system will satisfy existing design requirements and licensing commitments. All analyses and commitments submitted in the referenced letters remain valid.
As discussed with the NRC Staff in a September 15, 1989 telephone conversation, this system will be fully operational prior to plant ascension into Mode 4.
Should you have any questions regarding this information, please contact Mr. Richard R. Belanger at (603) 474-9521, extensio Ver truly you j Sa
-.& A Ted C. Feig Senior Vice President and Chief Operating Officer Enclosure cc:
Mr. William T. Russell Regional Administrator United States Nuclear Regulatory Commission Region I 475 Allendale Road King of Prussia, PA 19406
-Mr. Victor Nerses, Project Manager Project Directorate I-3 United States Nuclear Regulatory Commission Division of Reactor Projects Washington, DC 20555 Mr. Antone C. Cerne NRC Senior Residrnt Inspector P.O. Box 1149 Seabrook, NH 03874 i
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