ML20044D792
| ML20044D792 | |
| Person / Time | |
|---|---|
| Site: | Haddam Neck File:Connecticut Yankee Atomic Power Co icon.png |
| Issue date: | 05/17/1993 |
| From: | Office of Nuclear Reactor Regulation |
| To: | |
| Shared Package | |
| ML20044D787 | List: |
| References | |
| NUDOCS 9305200297 | |
| Download: ML20044D792 (4) | |
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'o UNITED STATES
~g NUCLEAR REGULATORY COMMISSION c.
,E WASHINGTON, D. C. 20555
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SAFETY EVALUATION BY THE OFFICE OF NUCLEAR REACTOR REGULATION RELATED TO AMENDMENT NO.157 TO FArILITY OPERATING LICENSE NO. DPR-61 i
CONNECTICUT YANKEE ATOMIC POWER COMPANY l
HADDAM NECK PLANT DOCKET NO. 50-213 i
1.0 INTRODUCTION
By letter dated March 22, 1993, the Connecticut Yankee Atomic Power Company (the licensee) submitted a request for changes to the Haddam Neck Plant l
Technical Specifications (TS). The requested amendment would change the following:
The footnote to Technical Specification 3.8.3.2.b is being revised l
to identify the available options for providing power to the 480 volt buses during plant shutdown (mode 5 or mode 6). This change adds the bus tie breakers 6T11 and 11T6 to the list of available tie breakers.
The change to Special Test Exception Technical Specifications 3.10.3 I
and Bases Section 3/4.10.3, Position Indication System-Shutdown, addresses exceptions for operability of the individual rod position indication (IRPI) system during shutdown modes.
A change to Bases Section 3/4.4.4., Relief Valves, clarifies why it is acceptable to place the power-operated relief valve (PORV) auto-trip signal in the bypass position if a pressurizer pressure channel fails.
A change to Bases Section 3/4.7.3, Service Water System, clarifies the definition of the service water header and describes the Adams filter bypass line and valves that were recently added to the service water system.
2.0 EVALUATION j
The staff evaluation of the proposed changes is reviewed by TS section below.
9305200297 930517 PDR ADOCK 05000213 P
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2.1 Technical Specification 3.8.3.2.b l
The footnote to Technical Specification 3.8.3.2.b is being revised i
to identify the available options for providing power to the 480 volt buses t
during plant shutdown (mode 5 or mode 6). This change adds the bus tie t
breakers 6T11 and 11T6 to the list of available tie breakers that can be i
4 utilized to achieve the subject limiting condition for operation. These tie breakers are in series and could be closed to provide power to Emergency Bus 11 from Emergency Bus 6 rather than Emergency Bus 9 in the event that the 4911 1
transformer is out of service. Since Bus 6 is also powered by Bus 9 the independence of redundant systems is not compromised. Adding this clarification assures independent redundant systems are maintained and, as such decreases the probability or consequences of accidents previously evaluated. Based on the above the staff concludes that this TS change is acceptable.
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j 2.2 Technical Specification 3.10.3 i
Currently Special Test Exception TS 3.10.3 will allow the suspension of the limitations of TS 3.1.3.3, " Position Indication System-Shutdown" only during the performance of individual shutdown and control rod drop time measurements.
3 The proposed TS will add the calibration of the Analog Rod Position Indication system or control rod drive slave cycler timing test to Special Test Exception TS 3.10.3.
The special test exception is necessary for the i
performance of all three activities, however, because of the way the TS was written the calibration of the position indication system and the control rod 1
cycler timing test could only be performed under the umbrella of this special i
exception during the control rod drop time measurements. Therefore, currently 4
i all three tests have to be performed in sequence during the performance of individual shutdown and control rod drop time measurements when TS 3.10.3 is invoked.
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This change will provide the licensee some flexibility as to when these three i
tests can be performed.
Part b of the limiting condition for operation (LCO) has been modified to a more limiting condition where K,,, must be maintained at less than or equal to 0.94 whenever any one bank of control rods is fully
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withdrawn. Previously, Part b of the LC0 only required that the analog rod position indication be operable to assure adequate shutdown margin. The SCRAM breakers are opened prior to the test to assure all rods are fully inserted prior to any test. The control rod drive system only allows one bank of rods to be moved at a time and the LCO only allows one bank of rods to be withdrawn during this test exception. Maintaining K le assuming the highest worth bank fully withYr, awn,ss than or equal to 0.94, ensures that the shutdown requirements are met and therefore, the individual rod position indication system is not required. This position was previously analyzed and is an accepted exception in the current TS 3.10.3 for when the analog rod position 1
. 4 indication system is inoperable during the initial calibration of the analog rod position indication system. The staff concludes that the reactivity requirements for the rod drop testing are bounding and that the proposed TS change to include the calibration of the Analog Rod Position Indication system or control rod drive slave cycler timing test to Special Test Exception TS is acceptable.
2.3 Bases Section 3/4.4.4. Relief Valves The change to the Bases Section 3/4.4.4 addresses the failure of a pressurizer pressure channel, in part, by placing the associated PORV auto-open signal in the bypass position, as opposed to the trip position. The present wording of the subject bases is not indicative of the specific safety importance of the PORVs relative to the accident analyses.
The clarification assures that placing a PORY auto-open channel to bypass is consistent with the accident analysis.
2.4 Bases Section 3/4.7.3. Service Water System i
This change incorporates a description of the Adams filter bypass line and valves.
These components were added to the service water system during the 1989-1990 refueling outage.
3.0 STATE CONSULTATION
In accordance with the Comission's regulations, the Connecticut State official was notified of the proposed issuance of the amendment. The State official had no coments.
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4.0 ENVIRONMENTAL CONSIDERATION
The amendment changes a requirement with respect to installation or use of a facility component located within the restricted area as defined in 10 CFR Part 20. The NRC staff has determined that the amendment involves 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 Comission has previously issued a proposed finding that the amendment involves no significant hazards consideration, and there has been no public coment on such finding (58 FR 19475). Accordingly, the amendment meets 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 amendment.
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5.0 CONCLUSION
1 The Commission has concluded, based on the considerations discussed above, i
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(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 i
activities will be conducted in compliance with the Commission's regulations, i
and (3) the issuance of the amendment will not be inimical to the common i
defense and security or to the health and safety of the public.
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Principal Contributor:
A. Wang Date:
May 17,1993 l
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