ML17331A264
| ML17331A264 | |
| Person / Time | |
|---|---|
| Site: | Cook  |
| Issue date: | 04/08/1993 |
| From: | Office of Nuclear Reactor Regulation |
| To: | |
| Shared Package | |
| ML17331A263 | List: |
| References | |
| NUDOCS 9304140336 | |
| Download: ML17331A264 (4) | |
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0 UNITED STATES NUCLEAR REGULATORY COMMISSION WASHINGTON, D.C. 205564001 SAFETY EVALUATION BY THE OFFICE OF NUCLEAR REACTOR REGULATION RELATED TO AMENDMENT NO.
172 TO FACILITY OPERATING LICENSE NO.
DPR-58 AND AMENDMENT NO.
155 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 Hay 1, 1992, 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 change the number of containment thermistor fire detectors to accurately reflect the as-built conditions in Units 1 and 2.
- 2. 0 EVALUATION The function of the fire detection and alarm system is to provide a means to
- detect, display, and annunciate the presence of fire in certain areas of the plant as required by regulations or where a fire hazard may be present.
The detection systems are designed to provide early detection of a fire, which can help to minimize the smoke and fire damage.
A number of fire detection thermistors are located in the containment to detect the presence of fire in the area of the reactor coolant pumps and those cable trays which contain combustible cables.
These thermistors are listed in Table 3.3-10 and Table 3.3-11 of Unit 1 TS 3.3.3.7 and Unit 2 TS 3.3.3.8, "Fire Detection Instrumentation," respectively.
The existing TS list the number of cable tray thermistors by quadrant.
The licensee proposes eliminating the thermistor to quadrant relationship in the TS and only list the total number of containment cable tray thermistors.
Currently, the TS list the incorrect number of thermistors for each of the quadrants in both the Unit 1 and Unit 2 TS.
Additionally, the total number of containment cable tray thermistors contained in the Unit 2 TS is incorrect.
There are 64 instead of 66 thermistors.
The errors in the number of thermistors per quadrant has resulted in the licensee instituting Action "c" of the TS, since the actual number of operational thermistors is less than that listed in the TS for several of the quadrants.
Given the current TS, this action would be required even if none of the thermistors were inoperable.
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The licensee proposes to simplify the applicable tables in the TS by listing only the total number of containment cable tray thermistors as opposed to listing them by quadrant.
This would have no impact on the actions currently required if any single thermistor in a quadrant became inoperable.
In the revised TS, if any thermistor became inoperable, a fire watch patrol would be required to inspect the containment zone once every eight hours or monitor containment air temperature at the locations listed in TS 4.6. 1.5 once per hour.
The licensee also proposes modifying one of the footnotes to Table 3.3-10 (Unit 1) and Table 3.3-11 (Unit 2).
The current footnote which states how each thermistor was assigned to a quadrant would be replaced with a footnote that states thermistors are located in all cable trays containing combustible cables in all the quadrants in both the upper and lower containment.
In its submittal of May 1, 1992, the licensee committed to performing a design verification of the containment cable trays for both units.
This was intended to ensure that cable trays containing combustible cables are adequately protected with thermistor strings.
The licensee has completed this design verification.
The staff has reviewed the licensee's proposed technical specifications amendments and has found them to be administrative in nature.
Considering the information above, the staff has found the changes to the technical specifications to be 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.
The State official had no comments.
- 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.
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 (57 FR 30250).
Accordingly, the amendments meet the eligibility criteria for categorical exclusion set forth in 10 CFR 51.22(c)(9). 'ursuant 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 safety 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:
W. Dean Date:
April 8, 1993