ML20055E236
| ML20055E236 | |
| Person / Time | |
|---|---|
| Site: | Haddam Neck File:Connecticut Yankee Atomic Power Co icon.png |
| Issue date: | 07/02/1990 |
| From: | Office of Nuclear Reactor Regulation |
| To: | |
| Shared Package | |
| ML20055E232 | List: |
| References | |
| NUDOCS 9007110199 | |
| Download: ML20055E236 (4) | |
Text
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1-UNITED STATE 8 i','].
4 NUCLEAR REGULATORY COMMISSION j
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wAssiworow, p. c. rossa SAFETY EVALUATION BY'THE'0FFICE OF NUCLEAR REACTOR REGULATION RELATED T0 AMENDMENT NO.126 4
TO FACILITY OPERATING LICENSE NO. DPR-61' l
T CONNECTICUT YANKEE ATOMIC. POWER COMDANY HADDAM NECK PLANT DOCKET NO. 50-213 1.0. INTRODUCTION ~
Pursuant to 10 CFR 50.90, Connecticut Yankee Atomic Power Company (CYAPCO) has
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proposed to amend the Operating License No. DPR-61 for the Haddam Neck Plant.
.By, letter dated' April 24, 1990, CYAPC0 proposed to amend the Technical.Speci-ifications -(TS) Sections 3.7.6.2, Spray and/or Sprinkler Systems, Section 3.7.6.3, CO, Systems, and Table 3.3-8, Fire Detection. Systems.
These changes include modifying the Cable Vault CO System, increasing the number of smoke 2
tand heat detectors that'are required to be operable.in the diesel generator rooms A and B and in the turbine lube oil reservoir area, and changing the TSs
= to reflect the modifications made to the turbine lube oil system to provide an
, automatic suppression system.
2.0 DISCUSSION l
' 'By: letter dated January 8,1990, Connecticut Yankee Atomic Power Company (The licensee) requested approval of proposed modifications to the carbon dioxide l
fire suppression system which protects the, containment cable vault. The existing design'was reviewed and approved by the staff in a safety evaluation i
dated October 3,1978 and is encompassed by a license condition.
In. addition, CYAPC0 increased the number of smoke detectors in Diesel Generator Rooms 1A and IB from 4 out of 5 operable /available to 6 out of 7, 6
increased the number of smoke detectors.near the turbine lube oil reservoir from 7: out of 7 operable /available to 11 out of 11 and modified the turbine
, -lube oil reservoir manually actuated system to an automic pre-action system.
The' proposed modifications are intended to enhance the 7apabilities of the'
-fire protection' systems as described below.
1 3.0 EVALUATION 3.1 Cable Vault CO System-2 Design' details of.the existing CO system are presented in the above-referenced 2
letter. 'The licensee proposes to install additional CO cylinders and modify 2
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2 the distribution system piping and nozzles for the purpose of discharging more fire suppression agent into the containment cable vault at a faster rate than presently designed.
In addition, the method of C0 discharge will be changed such Pat the main.00 storage cylinder bank will $ischarge to the lower level of thf cable vault wh$le the second bank discharges into the upper level of the.
vault. This rodification will provide an extended discharge capability by discharging both banks, and will eliminate the existing reserve discharge l
capability. The change in design wi11' require that new activators be installed and will necessitate the removal of the existing mechanical time delays.
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Additional details of the proposed modifications are delineated in the subject letter.
The staff's principal concern with the proposed modification was the elimination of the existing capability to discharge an additional-L.
. quantity of ca bon dioxide from a reserve bank of storage cylinders.
In the event that a fire was not extinguished by an initial discharge, the system in its present configuration has the capability for a second discharge. The licensee has mitigated this concern by enhancing the capability cf the-system to put out a fire in the first attempt. This will be accomplished by modifying the system to feature an " extended discharge" capability. This capability permits carbon dioxide gas to be discharged into the vault such that the design concentration will be maintained throughout a 20 minute time interval (soak time).
Suecifi-cally, the system will be designed to achieve 30% concentration of CO, at
-l 2 minutes, 50% at 7 minutes and will maintain 50% carbon dioxide for 20 minutes. The design concentration and soak time is sufficient to provide reasonable assurance that any fire in the vault will be controlled.
1 During the soak interval, the plant fire brigade will have been notified and dispatched to the scene. Their arrival at the scene is expected within minutes, well within the 20 minute time period that the C0 concentration will be maintained.
If any residual smoldering combustion-exists, the fire brigade will complete extinguishment using manual fire fighting equipment. Therefore, the lack of a reserve quantity of carbon dioxide is not' considered safety significant.
Th'e staff was also concerned that the modifications will be implemented in accordance with the industry standard, and that a full discharge acceptance test will be performed. The licensee has committed to perform
-a full discharge test to confirm the design capabilities of the system.
Also, the modifications will conform with the applicable provisions of National' Fire Protection Association Standard No. 12.
The above satisfactorily addresses the staff concern.
3.2-Additional Smoke Detectors To Diesel Generator Rooms A and B The current fire detection system was reviewed and approved in a safety evaluation dated October 3, 1978. The locations of the original five detectors in the Diesel Generator Room are unchanged. The licensee has added two ad-ditional smoke detectors in each of the Diesel Generator Rooms A and B.
The smoke detectors were added in accordance with National Fire Protection Asso-ciation(NFPA) Code 72E,StandardonAutomaticFireDetectors. Therefore, w
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.4 i-the new smoke detectors will provide increased fire detection and the proposed i
TS increases the operability requirements for;the smoke detectors in the Diesel Generator Room., This TS change will provide a higher level of fire protection 3
and represents an additional level of control not previously included in the 1
TS.
3.3 Additional Heat Detectors to Turbine Lube 011 Condition 11g Area
.The current fire detection system was reviewed and approved n a safety evaluation dated October 3,1978. Of the original seven deti.ctors in the Turbine Lube Oil Area, only one detector was moved to instal the four new detectors. The heat-detectors were added and the one-de ector moved in accordance rith the NFPA Code 72E. Therefore, the new heat detectors will provide' increased fire detection and the proposed TS increases the operability reouirements for the heat detectors in the Turbine Lube Oil Conditioning Area.
This TS change will provide a higher level of fire protection and-represents an additional level of control not previously
. included in the TS.
3.4 Automatic Pre-action Fire Suppression System In the Turbine Lube Oil Conditioning Area l
The current manually actuated deluge fire suppression system-in the turbine lube oil area has been modified to an automatic pre-action l-system. The current fire suppression system was reviewed and approved in a safety evaluation dated October 3,1978. The licensee has maintained i
the original manual actuation capability. The new automatic pre-action a
L system was installed in accordance with NFPA Code 13, Standard for the J
Installation of Sprinkler Systems and Code 15, Standard for Water Spray
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' Fixed Systems.
Therefore, the fire protection in the turbine lube oil area will be enhanced with the new automatic preiaction system while maintaining the current capability to manually initiate the fire suppression system.
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4.0
SUMMARY
Based on the above evaluation, the staff concludes that the licensee's L
proposed modifications to the carbon dioxide fire suppression system in the i
l cable vault area, the added smoke detectors in the diesel generator rocm, the added heat detectors in the turbine lube oil conditioning area and the new automatic pre-action fire suppression system in the turbine lobe oil
-conditioning area meet applicable staff fire protection criteria, and are, therefore, acceptable, l
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n ENVIRONMENTAL CONSIDERATION This amendment changes a requirement with respect to the installation or use of a facility component located within the restricted area as defined in_10 CFR
-Part 20. We have determined that the amendment involves no significant increase in the amounts, and no significant change in the types, of any efflu-eats that may be released offsite, and that-there is no significant increase in individual or cumulative occupational radiation exposure. The staff has pre-viously published a proposed finding that the amendment involves no significant hazards consideration and there has been no public comment on such finding.
Accordingly, the amendment meets the eligibility criteria for-categorical exclu-
'sionsetforthin10CFR51.22(c)(9).
Pursuantto10CFR51.22(b),noenvi-ronmental impact-statement or-environmental assessment need be prepared in connection with the issuance of the amendment.
5.0 CONCLUSION
Wehaveconcluded,basedonthe~considerationsdiscussedabove,that(1)there is reasonable assurance that the health and safety of the public will not be endangered by operation in.the proposed manner, and (2) such activities will be conducted in compliance with the Commission's regulations, and (3) the issuance
~ f the amendment will not be inimical to the common defense and security or to o
the health and safety of the public.
Dated: July 2, ~ 1990 Principal Contributors:
D. Kubicki A. Wang-i