ML20153C411
| ML20153C411 | |
| Person / Time | |
|---|---|
| Site: | Brunswick  |
| Issue date: | 08/23/1988 |
| From: | Eury L CAROLINA POWER & LIGHT CO. |
| To: | NRC OFFICE OF ADMINISTRATION & RESOURCES MANAGEMENT (ARM) |
| Shared Package | |
| ML20153C414 | List: |
| References | |
| NLS-88-139, NUDOCS 8809010128 | |
| Download: ML20153C411 (9) | |
Text
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Cargline PWtiper & L&ght CZDs P. o. Don 1551
- Ralegh, N C. 27602 AUG 23 1988 LYNN W. EURY SERIAL: NLS 139
$ mot We Presdent 10CFR$0.90 operatens s*
87TSB23 United States Nuclear Regulatory Conunission ATTENTION: Document Control Desk Washington, DC 20555 BRUNSWICK STEAM ELECTRIC PIANT, UNIT NOS. 1 AND 2 DOCKET NOS. 50-325 & 50-324/ LICENSE NOS. DPR-71 & DPR-62 REQUES. FOR LICENSE AMENDMENT FIRE 0ZTECTION INSTRUMENTS Centiemen:
In accordance with the Code of Federal Regulations, Title 10, Parts 50.90 and 2.101, Carolina Power & Light Company (CP&L) hereby requests a revision to the Technical Specifications (TS) for the Brunswick Steam Electric Plant (BSEP), Units 1 and 2.
The proposed change revises the type of fire detection instruments required tor the diesel generator building specified in TS Table 3.3.5.7-1 (instrument location 3, detector zones 5,6,7 and 8). provides a detailed description of the proposed changes and the basis for the changes. details the basis for the Company's determination that the proposed changes do not involve a significant hazards consideration. provides instructions for incorporation of the proposed changes into the Technical Specifications for each unit. provides a summary of the proposed Technical Specification changes for each unit on a page by page basis. provides the proposed Technical Specification pages for BSEP-1. provides the proposed Technical Specification pages for BSEP-2.
In accordance with the requirements of 10CFR170.12, a check for $150 is also enclosed,
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0809010128 880823 Eeb td ' kI 60
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Document C:ntrol Desk NLS 88 139 / Page 2 Please refer any questions regarding this submittal to Mr. Stephen D.
Floyd at (919)_836 6901.
Yours very truly, M
L. W. Eur AWS/aws
Enclosures:
1.
Basis for Change Request 2.
10CFR50.92 Evaluation 3.
Instructions for Incorporation 4.
Summary List of Revisions 5.
Technical Specification Pages, BSEP 1 6.
Technical Specification Pages, BSEP 2 cc:
Mr. Dayne H. Brown Dr. J. Nelson Grace Mr. W. H. Ruland Mr. B. C. Buckley L. W. Eury, having been first duly sworn, did depose and say that the information contained herein is true and correct to the best of his information, knowledge and belief; and the sources of his information are officers, employees, contractors, and agents of Carolina Power &
Light Company.
N atacy <Sean My commission expires:
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ENCLOSURE 1 BRUNSWICK STEAM ELECTRIC PLANT, UNITS 1 AND 2 NRC DOCKETS 50 325 6 50 324 OPERATING LICENSES DPR 71 & DPR 62 REQUEST FOR LICENSE AMENDMENT FIRE DdTECTION INSTRUMENTS BASIS FOR CHANGE REQUEST Procosed Chance currently, fire detector zones 5,6,7 and 8 in the diesel generator building have seven smoke detectors per diesel generator cell and no flame or heat detectors.
The proposed change would eliminate the smoke detectors and replace them with three heat detectors and four flame detectors per diesel generator cell.
Note that TS Table 3.3.5.7 1 shows the minimum number of detectors that must be operable in order to consider the subject zone operable. The proposed change would require at least two of the three heat detectors and at least three of the four flame detectors to be operable before a zone can be considered operable.
1 Basis l
The function of the Brunswick fire detection system is to continuously monitor for the presence of a fire and to alarm in the event of a fire.
The system consists of detectors, control panels, annunciator panels, and associated electrical circuits.
The fire detection system is arranged into detector zones which consist of an electrical circuit with it's associated detectors. Detector zones are used where a common area or hazard is covered by fire detectors. A separate fire detector zone (DG5, DG6, DC/ and DG8) has been designated for each diesel generator cell. Each diesel generator cell is also referenced as a separate fire area (DC-2, DG 3, DG 4 and DG 5).
Based on the fire hazards analysis contained in Section 9.5 of the Updated FSAR, there are two basic fire hazards associated with the diesel generator cells.
These are: (1) fires associated with ordinary combustible materials due to transient combustibles in the area, and (2) fires associated with combustion of fuel oil.
Exposure from ordinary combustible fires is not expected to be severe enough to cause damage to safety related equipment.
Fuel oil fires are also not projected to be severe unless they occur between the diesel generator fuel pump and the fuel injectors.
Because of the high pressure and atomized spray of fuel oil at this location, the fire would be intense and severe damage to the diesel generator could occur.
This type of fire would produce intense heat and visible flame.
Currently the diesel generator cells are equiped with smoke detectors.
Smoke detectors are sensitive instruments capable of detecting the early products of combustion before they Lecome visible smoke.
Due to their El.1
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sensitivity to aerosols other than those produced by a firo, the subject smoke detectors have been yielding an excessive number of unnecessary alarms.
The proposed change would modify the present fire detection system for the diesel generator cells by replacing the present smoke detectors with a combination of heat and flame detectors. The heat detectors are of the fixed temperature / rate of temperature rise time type and are extremely reliable.
The flame detectors are of the infrared type. Both 4
detector types are expected to initiate few unnecessary alarms in this application.
Although smoke detectors respond faster than the heat detectors to most fires, this shortcoming is mor-than compensated for by the flame detectors which respond faster than smoke detectors to flaming fires, which is the type of fire expected.
The proposed combination of heat and flame detectors is expected to provide a more dependable service than that from smoke detectors, without sacrificing performance.
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s ENCLOSURE 2 BRUNSWICK STEAM ELECTRIC PLANT, UNITS 1 AND 2 NRC DOCKETS 50 325 6 50 324 OPERATING LICENSES DPR.71 & DPR 62 REQUEST FOR LICENSE AMENDMENT FIRE DETECTION INSTRUMENTS 10CFR50.92 EVALUATION The Commission has provided standards in 10CFR50.92(c) for determining whether a significant hazards consideration exists. A proposed amendment to an operating license for a facility involves no significant hazards consideration if operation of the facility in accordance with the proposed amendment would not: (1) involve a significant increase in the probability or consequences of an accident previously evaluated, (2) create the possibility of a new or different kind of accident from any accident previously evaluated, or (3) involve a significant reduction in a margin of safety.
Carolina Power & Light Company has reviewed this proposed license amendment request and determined that its adoption would not involve a significant hazards consideration.
The bases for this determination are as follows:
Proposed Change The proposed change would eliminate the smoke detectors specified in fire detector zones 5,6,7 and 8 in the diesel generator building, and replace them with three heat detectors and four flame detectors per diesel generator cell.
Basis The change does not involve a significant hazards consideration for the following reasons:
1.
The fire detection system is designed for detection and mitigation of accidents involving fires but does not affect the probability of those accidents.
The proposed change involves the use of a more effective fire detection instrument arrangement based on the fire hazards associated with ths diesel generator cells.
The new heat and flame detectors will provide an enhanced means of detecting the major fire hazard (a fuel oil fire) expected to result in significant damage to the diesel generators.
This enhancement will provide equivalent limitations on the consequences of this type of fire.
Based on this reasoning, CP&L has determined that the proposed amendment does not involve a significant increase in the probability or consequences of an accident previously evaluated.
2.
The accidents analyzed in Chapter 15 of the Updated FSAR are not affected by the proposed change in detector types.
The change in E2-1
detectors will not affect the fire detection system's ability to perform it's intended function. The niw flame and heat detectors are more suited for the-fire hazard involved than the present smoke detectors.
Since the fire detection system, including the detection instruments, affect only the detection and subsequent mitigation of a fire - CP&L has determined that the proposed amendment does not create the possibility of a new or different kind.of accident from any accident previously evaluated.
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The proposed change provides an enhanced capability of detecting a j
severe fuel oil fire in the diesel generator cells. This type of fire hazard was evaluated to have the grertest impact on the e
continued availability of the diesel generators. The new flame and heat detectors are more suited for the rapid detection of this l
type of fire. The present smoke detectors are better suited for
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detecting a fire with a long incipient or smoldering stage, which
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generally involves burning of ordinary combustible materials.
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has been determined that this type of fire will not likely result in damage to safety related equipment located in the diesel generator cells. Therefore, the proposed amendment does not i
involve a significant reduction in the margin of safety.
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1 ENCLOSURE 3 BRUNSWICK STEAM ELECTRIC PIANT, UNITS 1 AND 2 NRC DOCKETS 50 325 6 50 324 OPERATING LICENSES DPR 71 & DPR 62 REQUEST FOR LICENSE AMENDMENT FIRE DETECTION INSTRUMENTS INSTRUCTIONS FOR INCORPORATION The proposed changes to the Technical Specifications (Appendix A to Operating Licenses DPR 71 and DPR 62) would be incorp) rated as follows:
UNIT 1 Remove Page Insert Page 3/4 3 60 3/4 3 60 3/4 3 61 3/4 3-61 UNIT 2 Remove Page Insert Page 3/4 3 60 3/4 3 60 3/4 3 61 3/4 3 61 l
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ENCLOSURE 4 BRUNSWICK STEAM ELECTRIC PIANT, UNITS 1 AND 2 NRC DOCKETS 50 325 & 50 324 OPERATING LICENSES DPR 716 DPR 62 REQUEST FOR LICENSE AMENDMENT FIRE DETECTION INST 1UMENTS l
SUMMARY
LIST OF REVISIONS UNIT 1 Pages Descrintion of Changes 3/4 3 60 Revises TS Table 3.3.5.7 1 to reflect changes to the i
fire detection instruments for the Diesel Generator Building, Zone 5 and 6 3/4 3 61 Revises TS Table 3.3.5.7 1 the fire detection instruments for the Diesel Gene..cor Building, Zone 7 and 8 UNIT 2 Pares Descrintion of Changes 3/4 3 60 Revises TS Table 3.3.5.7 1 the fire detection instruments for the Diesel Generator Building, Zone 5 l
and 6 3/4 3-61 Revises TS Table 3.3.5.7 1 the fire detection instruments for the Diesel Generator Building, Zone 7 and 8 E4 1 l
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i ENCLOSURE 5.
l BRUNSWICK STEAM ELECTRIC PLANT' UNIT 1 NRC DOCKET 50 325 i
OPERATING LICENSE DPR 71 REQUE.ST FOR LICENSE AMENDMENT FIRE DETECTION INSTRUMENTS l
TECHNICAL SPECIFICATION PAGES l
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