ML17331A254
| ML17331A254 | |
| Person / Time | |
|---|---|
| Site: | Cook  |
| Issue date: | 03/31/1993 |
| From: | Office of Nuclear Reactor Regulation |
| To: | |
| Shared Package | |
| ML17331A253 | List: |
| References | |
| NUDOCS 9304130084 | |
| Download: ML17331A254 (6) | |
Text
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UNITED STATES NUCLEAR REGULATORY COMMISSION WASHINGTON. D.C. 20555-0001 SAFETY EVALUATION BY HE OFFICE OF NUCLEAR REACTOR REGULATION RELATED TO AMENDMENT NO.
TO FACILITY OPERATING LICENSE NO.
DPR-58 AND AMENDMENT NO.
TO FACILITY OPERATING LICENSE NO. DPR-74 INDIANA MICHIGAN POWER COMPANY DONALD C.
COOK NUCLEAR PLANT UNIT NOS.
1 AND 2 DOCKET NOS. 50-315 AND 50-316
- 1. 0 INTRODUCTION By letter dated February 12,
- 1992, as supplemented January 27, 1993, the Indiana Michigan Power Company (the licensee) requested amendments to the Technical Specifications (TS) appended to Facility Operating License Nos.
DPR-58 and DPR-74 for the Donald C.
Cook Nuclear Plant, Unit Nos.
1 and 2.
The proposed amendments would add limiting conditions for operation and surveillance requirements for the newly installed fire water tanks, fire water
- pumps, and associated components and controls.
- 2. 0 EVALUATION Currently, Lake Michigan supplies the water used in the fire suppression water systems at the D.
C.
Cook Nuclear Plant, Units 1 and 2.
In the last few
- years, propagation of zebra mussels into Lake Michigan has posed a significant threat to the operability of these systems at D. C.
Cook as well as other facilities that use Lake Michigan as a source of water.
As a precautionary
- measure, the licensee has installed a new dedicated water supply for fire suppression which is free from the potential of zebra mussel infestation.
The fire suppression water system will be supplied with water from two new, dedicated, 100 percent capacity water 'tanks.
Each tank has a minimum usable volume of 565,000 gallons, which represents the required amount of water needed to supply the largest fire demand as described in the Fire Protection Program Manual (FPPH) for a period of two hours (i.e.,
4700 gallons per minute (gpm) for the combined flow, including hose
- streams, for the Unit 1
transformer and turbine building wall exposure systems.)
To provide adequate volume and pressure for the fire suppression
- systems, the licensee installed three new fire pumps, each having a 2500 gpm (50 percent) capacity.
Two of the pumps will be diesel driven and one will be electric motor driven.
The installation of the pumps is designed such that 100 percent fire suppression water supply capacity will be available assuming failure of any one pump or 9304130084 '30331 PDR ADOCK 05000315 P
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the loss of off-site power.
The fire pumps can take suction from either one or both of the newly installed water tanks.
A failure of one tank or its piping will not result in both tanks going empty inadvertently.
The fire pumps have been installed in accordance with National Fire Protection'ssociation (NFPA) 20, "Standard for the Installation of Centrifugal Fire Pumps."
The installation of the new fire suppression water storage tanks and the fire pumps are in accordance with the requirements of Section C.6.b of Branch Technical Position (BTP)
CMEB 9.5-1, "Guidelines for Fire Protection for Nuclear Power Plants."
The existing fire suppression water supply system will remain intact.
Two 2000 gpm diesel driven fire water pumps will be maintained operational in order to facilitate the capability of obtaining fire water from Lake Michigan.
The existing, diesel driven fire water pumps and associated piping and components will be isolated from the rest of the fire suppression water system to preclude the possibility of zebra mussel infestation.
The automatic controls for the existing diesel driven pumps will be removed.
Therefore, simple local manual action to start and line up these pumps will be required to place them in service.
The existing fire suppression water system will serve a backup function to the new system in the event the new system were to become inoperable.
The licensee has proposed limiting conditions for operation (LCO),
surveillance requirements, and bases for the new fire suppression water storage tanks and fire pumps consistent with the Standard Technical Specifications (STS),
NUREG-0103, with one exception.
The STS allows one storage tank to be out of service for 7 days before action is required by the licensee to provide an adequate backup source of water.
The licensee has proposed a 30-day outage time limit for one storage tank.
The licensee justifies this position by indicating that the existing fire suppression water system will not be removed from service when the new system is made operational.
The automatic actuation capability will be disconnected, but only simple local operator actions will be required to put the system in
- service, thus providing a complete redundant water supply for fire suppression.
The existing fire suppression water system has previously been reviewed by the staff and found acceptable in an NRC Safety Evaluation Report (SER) dated July 31, 1979.
In the highly unlikely event a fire occurs concurrent with one of the new storage tanks being out of service and a single failure occurs rendering the second storage tank inoperable, a complete, redundant fire suppression water system can be put in service following the completion of several simple operator actions.
Therefore, the staff finds that notwithstanding extending the LCO from 7 days to 30 days for an inoperable storage tank, the margin'f safety of the fire suppression water system will still be adequate.
Based on the above evaluation, the staff.finds'hat the installation of new fire suppression water storage tanks, fire pumps, and associated components and controls is in accordance with BTP CMEB 9.5-1 and is, therefore, acceptable.
In addition, the proposed TS for the fire suppression water system are acceptable.
- 3. 0 STATE CONSULTATION In accordance with the Commission's regulations, the Michigan State official was notified of the proposed issuance of the amendments.
- 4. 0 ENVIRONMENTAL CONSIDERATION The amendments change the requirements with respect to the installation or use of a facility component located within the restricted area as defined in 10 CFR Part 20 and change the surveillance requirements.
The staff has determined that the amendments involve no significant increase in the amounts, and no significant change in the types, of any effluents that may be released
- offsite, and that there is no significant increase in individual or cumulative occupational radiation exposure.
The Commission has previously issued a
proposed finding that the amendments involve no significant hazards consideration and there has been no public comment on such finding (58 FR 596).
Accordingly, the amendments meet the eligibility criteria for categorical exclusion set forth in 10 CFR 51.22(c)(9).
Pursuant to 10 CFR 51.22(b),
no environmental impact statement or environmental assessment need be prepared in connection with the issuance of the amendments.
- 5. 0 CONCLUSION The staff has concluded, based on the considerations discussed above, that:
(1) there is reasonable assurance that the health and safet'y of the public will not be endangered by operation in the proposed
- manner, (2) such activities will be conducted in compliance with the Commission's regulations, and (3) the issuance of the amendments will not be inimical to the common defense and security or to the health and safety of the public.
Principal Contributor:
J.
Stang W. Dean March 31, f993
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